Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
8f18cf13 | 19 | #include <linux/kernel.h> |
065631f6 | 20 | #include <linux/bio.h> |
39279cc3 | 21 | #include <linux/buffer_head.h> |
f2eb0a24 | 22 | #include <linux/file.h> |
39279cc3 CM |
23 | #include <linux/fs.h> |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/string.h> | |
39279cc3 CM |
29 | #include <linux/backing-dev.h> |
30 | #include <linux/mpage.h> | |
31 | #include <linux/swap.h> | |
32 | #include <linux/writeback.h> | |
33 | #include <linux/statfs.h> | |
34 | #include <linux/compat.h> | |
9ebefb18 | 35 | #include <linux/bit_spinlock.h> |
5103e947 | 36 | #include <linux/xattr.h> |
33268eaf | 37 | #include <linux/posix_acl.h> |
d899e052 | 38 | #include <linux/falloc.h> |
5a0e3ad6 | 39 | #include <linux/slab.h> |
7a36ddec | 40 | #include <linux/ratelimit.h> |
22c44fe6 | 41 | #include <linux/mount.h> |
4b4e25f2 | 42 | #include "compat.h" |
39279cc3 CM |
43 | #include "ctree.h" |
44 | #include "disk-io.h" | |
45 | #include "transaction.h" | |
46 | #include "btrfs_inode.h" | |
47 | #include "ioctl.h" | |
48 | #include "print-tree.h" | |
e6dcd2dc | 49 | #include "ordered-data.h" |
95819c05 | 50 | #include "xattr.h" |
e02119d5 | 51 | #include "tree-log.h" |
4a54c8c1 | 52 | #include "volumes.h" |
c8b97818 | 53 | #include "compression.h" |
b4ce94de | 54 | #include "locking.h" |
dc89e982 | 55 | #include "free-space-cache.h" |
581bb050 | 56 | #include "inode-map.h" |
39279cc3 CM |
57 | |
58 | struct btrfs_iget_args { | |
59 | u64 ino; | |
60 | struct btrfs_root *root; | |
61 | }; | |
62 | ||
6e1d5dcc AD |
63 | static const struct inode_operations btrfs_dir_inode_operations; |
64 | static const struct inode_operations btrfs_symlink_inode_operations; | |
65 | static const struct inode_operations btrfs_dir_ro_inode_operations; | |
66 | static const struct inode_operations btrfs_special_inode_operations; | |
67 | static const struct inode_operations btrfs_file_inode_operations; | |
7f09410b AD |
68 | static const struct address_space_operations btrfs_aops; |
69 | static const struct address_space_operations btrfs_symlink_aops; | |
828c0950 | 70 | static const struct file_operations btrfs_dir_file_operations; |
d1310b2e | 71 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
72 | |
73 | static struct kmem_cache *btrfs_inode_cachep; | |
8ccf6f19 | 74 | static struct kmem_cache *btrfs_delalloc_work_cachep; |
39279cc3 CM |
75 | struct kmem_cache *btrfs_trans_handle_cachep; |
76 | struct kmem_cache *btrfs_transaction_cachep; | |
39279cc3 | 77 | struct kmem_cache *btrfs_path_cachep; |
dc89e982 | 78 | struct kmem_cache *btrfs_free_space_cachep; |
39279cc3 CM |
79 | |
80 | #define S_SHIFT 12 | |
81 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
82 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
83 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
84 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
85 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
86 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
87 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
88 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
89 | }; | |
90 | ||
a41ad394 JB |
91 | static int btrfs_setsize(struct inode *inode, loff_t newsize); |
92 | static int btrfs_truncate(struct inode *inode); | |
5fd02043 | 93 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent); |
771ed689 CM |
94 | static noinline int cow_file_range(struct inode *inode, |
95 | struct page *locked_page, | |
96 | u64 start, u64 end, int *page_started, | |
97 | unsigned long *nr_written, int unlock); | |
7b128766 | 98 | |
f34f57a3 | 99 | static int btrfs_init_inode_security(struct btrfs_trans_handle *trans, |
2a7dba39 EP |
100 | struct inode *inode, struct inode *dir, |
101 | const struct qstr *qstr) | |
0279b4cd JO |
102 | { |
103 | int err; | |
104 | ||
f34f57a3 | 105 | err = btrfs_init_acl(trans, inode, dir); |
0279b4cd | 106 | if (!err) |
2a7dba39 | 107 | err = btrfs_xattr_security_init(trans, inode, dir, qstr); |
0279b4cd JO |
108 | return err; |
109 | } | |
110 | ||
c8b97818 CM |
111 | /* |
112 | * this does all the hard work for inserting an inline extent into | |
113 | * the btree. The caller should have done a btrfs_drop_extents so that | |
114 | * no overlapping inline items exist in the btree | |
115 | */ | |
d397712b | 116 | static noinline int insert_inline_extent(struct btrfs_trans_handle *trans, |
c8b97818 CM |
117 | struct btrfs_root *root, struct inode *inode, |
118 | u64 start, size_t size, size_t compressed_size, | |
fe3f566c | 119 | int compress_type, |
c8b97818 CM |
120 | struct page **compressed_pages) |
121 | { | |
122 | struct btrfs_key key; | |
123 | struct btrfs_path *path; | |
124 | struct extent_buffer *leaf; | |
125 | struct page *page = NULL; | |
126 | char *kaddr; | |
127 | unsigned long ptr; | |
128 | struct btrfs_file_extent_item *ei; | |
129 | int err = 0; | |
130 | int ret; | |
131 | size_t cur_size = size; | |
132 | size_t datasize; | |
133 | unsigned long offset; | |
c8b97818 | 134 | |
fe3f566c | 135 | if (compressed_size && compressed_pages) |
c8b97818 | 136 | cur_size = compressed_size; |
c8b97818 | 137 | |
d397712b CM |
138 | path = btrfs_alloc_path(); |
139 | if (!path) | |
c8b97818 CM |
140 | return -ENOMEM; |
141 | ||
b9473439 | 142 | path->leave_spinning = 1; |
c8b97818 | 143 | |
33345d01 | 144 | key.objectid = btrfs_ino(inode); |
c8b97818 CM |
145 | key.offset = start; |
146 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); | |
c8b97818 CM |
147 | datasize = btrfs_file_extent_calc_inline_size(cur_size); |
148 | ||
149 | inode_add_bytes(inode, size); | |
150 | ret = btrfs_insert_empty_item(trans, root, path, &key, | |
151 | datasize); | |
c8b97818 CM |
152 | if (ret) { |
153 | err = ret; | |
c8b97818 CM |
154 | goto fail; |
155 | } | |
156 | leaf = path->nodes[0]; | |
157 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
158 | struct btrfs_file_extent_item); | |
159 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
160 | btrfs_set_file_extent_type(leaf, ei, BTRFS_FILE_EXTENT_INLINE); | |
161 | btrfs_set_file_extent_encryption(leaf, ei, 0); | |
162 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
163 | btrfs_set_file_extent_ram_bytes(leaf, ei, size); | |
164 | ptr = btrfs_file_extent_inline_start(ei); | |
165 | ||
261507a0 | 166 | if (compress_type != BTRFS_COMPRESS_NONE) { |
c8b97818 CM |
167 | struct page *cpage; |
168 | int i = 0; | |
d397712b | 169 | while (compressed_size > 0) { |
c8b97818 | 170 | cpage = compressed_pages[i]; |
5b050f04 | 171 | cur_size = min_t(unsigned long, compressed_size, |
c8b97818 CM |
172 | PAGE_CACHE_SIZE); |
173 | ||
7ac687d9 | 174 | kaddr = kmap_atomic(cpage); |
c8b97818 | 175 | write_extent_buffer(leaf, kaddr, ptr, cur_size); |
7ac687d9 | 176 | kunmap_atomic(kaddr); |
c8b97818 CM |
177 | |
178 | i++; | |
179 | ptr += cur_size; | |
180 | compressed_size -= cur_size; | |
181 | } | |
182 | btrfs_set_file_extent_compression(leaf, ei, | |
261507a0 | 183 | compress_type); |
c8b97818 CM |
184 | } else { |
185 | page = find_get_page(inode->i_mapping, | |
186 | start >> PAGE_CACHE_SHIFT); | |
187 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
7ac687d9 | 188 | kaddr = kmap_atomic(page); |
c8b97818 CM |
189 | offset = start & (PAGE_CACHE_SIZE - 1); |
190 | write_extent_buffer(leaf, kaddr + offset, ptr, size); | |
7ac687d9 | 191 | kunmap_atomic(kaddr); |
c8b97818 CM |
192 | page_cache_release(page); |
193 | } | |
194 | btrfs_mark_buffer_dirty(leaf); | |
195 | btrfs_free_path(path); | |
196 | ||
c2167754 YZ |
197 | /* |
198 | * we're an inline extent, so nobody can | |
199 | * extend the file past i_size without locking | |
200 | * a page we already have locked. | |
201 | * | |
202 | * We must do any isize and inode updates | |
203 | * before we unlock the pages. Otherwise we | |
204 | * could end up racing with unlink. | |
205 | */ | |
c8b97818 | 206 | BTRFS_I(inode)->disk_i_size = inode->i_size; |
79787eaa | 207 | ret = btrfs_update_inode(trans, root, inode); |
c2167754 | 208 | |
79787eaa | 209 | return ret; |
c8b97818 CM |
210 | fail: |
211 | btrfs_free_path(path); | |
212 | return err; | |
213 | } | |
214 | ||
215 | ||
216 | /* | |
217 | * conditionally insert an inline extent into the file. This | |
218 | * does the checks required to make sure the data is small enough | |
219 | * to fit as an inline extent. | |
220 | */ | |
7f366cfe | 221 | static noinline int cow_file_range_inline(struct btrfs_trans_handle *trans, |
c8b97818 CM |
222 | struct btrfs_root *root, |
223 | struct inode *inode, u64 start, u64 end, | |
fe3f566c | 224 | size_t compressed_size, int compress_type, |
c8b97818 CM |
225 | struct page **compressed_pages) |
226 | { | |
227 | u64 isize = i_size_read(inode); | |
228 | u64 actual_end = min(end + 1, isize); | |
229 | u64 inline_len = actual_end - start; | |
230 | u64 aligned_end = (end + root->sectorsize - 1) & | |
231 | ~((u64)root->sectorsize - 1); | |
c8b97818 CM |
232 | u64 data_len = inline_len; |
233 | int ret; | |
234 | ||
235 | if (compressed_size) | |
236 | data_len = compressed_size; | |
237 | ||
238 | if (start > 0 || | |
70b99e69 | 239 | actual_end >= PAGE_CACHE_SIZE || |
c8b97818 CM |
240 | data_len >= BTRFS_MAX_INLINE_DATA_SIZE(root) || |
241 | (!compressed_size && | |
242 | (actual_end & (root->sectorsize - 1)) == 0) || | |
243 | end + 1 < isize || | |
244 | data_len > root->fs_info->max_inline) { | |
245 | return 1; | |
246 | } | |
247 | ||
2671485d | 248 | ret = btrfs_drop_extents(trans, root, inode, start, aligned_end, 1); |
79787eaa JM |
249 | if (ret) |
250 | return ret; | |
c8b97818 CM |
251 | |
252 | if (isize > actual_end) | |
253 | inline_len = min_t(u64, isize, actual_end); | |
254 | ret = insert_inline_extent(trans, root, inode, start, | |
255 | inline_len, compressed_size, | |
fe3f566c | 256 | compress_type, compressed_pages); |
2adcac1a | 257 | if (ret && ret != -ENOSPC) { |
79787eaa JM |
258 | btrfs_abort_transaction(trans, root, ret); |
259 | return ret; | |
2adcac1a JB |
260 | } else if (ret == -ENOSPC) { |
261 | return 1; | |
79787eaa | 262 | } |
2adcac1a | 263 | |
0ca1f7ce | 264 | btrfs_delalloc_release_metadata(inode, end + 1 - start); |
a1ed835e | 265 | btrfs_drop_extent_cache(inode, start, aligned_end - 1, 0); |
c8b97818 CM |
266 | return 0; |
267 | } | |
268 | ||
771ed689 CM |
269 | struct async_extent { |
270 | u64 start; | |
271 | u64 ram_size; | |
272 | u64 compressed_size; | |
273 | struct page **pages; | |
274 | unsigned long nr_pages; | |
261507a0 | 275 | int compress_type; |
771ed689 CM |
276 | struct list_head list; |
277 | }; | |
278 | ||
279 | struct async_cow { | |
280 | struct inode *inode; | |
281 | struct btrfs_root *root; | |
282 | struct page *locked_page; | |
283 | u64 start; | |
284 | u64 end; | |
285 | struct list_head extents; | |
286 | struct btrfs_work work; | |
287 | }; | |
288 | ||
289 | static noinline int add_async_extent(struct async_cow *cow, | |
290 | u64 start, u64 ram_size, | |
291 | u64 compressed_size, | |
292 | struct page **pages, | |
261507a0 LZ |
293 | unsigned long nr_pages, |
294 | int compress_type) | |
771ed689 CM |
295 | { |
296 | struct async_extent *async_extent; | |
297 | ||
298 | async_extent = kmalloc(sizeof(*async_extent), GFP_NOFS); | |
79787eaa | 299 | BUG_ON(!async_extent); /* -ENOMEM */ |
771ed689 CM |
300 | async_extent->start = start; |
301 | async_extent->ram_size = ram_size; | |
302 | async_extent->compressed_size = compressed_size; | |
303 | async_extent->pages = pages; | |
304 | async_extent->nr_pages = nr_pages; | |
261507a0 | 305 | async_extent->compress_type = compress_type; |
771ed689 CM |
306 | list_add_tail(&async_extent->list, &cow->extents); |
307 | return 0; | |
308 | } | |
309 | ||
d352ac68 | 310 | /* |
771ed689 CM |
311 | * we create compressed extents in two phases. The first |
312 | * phase compresses a range of pages that have already been | |
313 | * locked (both pages and state bits are locked). | |
c8b97818 | 314 | * |
771ed689 CM |
315 | * This is done inside an ordered work queue, and the compression |
316 | * is spread across many cpus. The actual IO submission is step | |
317 | * two, and the ordered work queue takes care of making sure that | |
318 | * happens in the same order things were put onto the queue by | |
319 | * writepages and friends. | |
c8b97818 | 320 | * |
771ed689 CM |
321 | * If this code finds it can't get good compression, it puts an |
322 | * entry onto the work queue to write the uncompressed bytes. This | |
323 | * makes sure that both compressed inodes and uncompressed inodes | |
b2570314 AB |
324 | * are written in the same order that the flusher thread sent them |
325 | * down. | |
d352ac68 | 326 | */ |
771ed689 CM |
327 | static noinline int compress_file_range(struct inode *inode, |
328 | struct page *locked_page, | |
329 | u64 start, u64 end, | |
330 | struct async_cow *async_cow, | |
331 | int *num_added) | |
b888db2b CM |
332 | { |
333 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
334 | struct btrfs_trans_handle *trans; | |
db94535d | 335 | u64 num_bytes; |
db94535d | 336 | u64 blocksize = root->sectorsize; |
c8b97818 | 337 | u64 actual_end; |
42dc7bab | 338 | u64 isize = i_size_read(inode); |
e6dcd2dc | 339 | int ret = 0; |
c8b97818 CM |
340 | struct page **pages = NULL; |
341 | unsigned long nr_pages; | |
342 | unsigned long nr_pages_ret = 0; | |
343 | unsigned long total_compressed = 0; | |
344 | unsigned long total_in = 0; | |
345 | unsigned long max_compressed = 128 * 1024; | |
771ed689 | 346 | unsigned long max_uncompressed = 128 * 1024; |
c8b97818 CM |
347 | int i; |
348 | int will_compress; | |
261507a0 | 349 | int compress_type = root->fs_info->compress_type; |
b888db2b | 350 | |
4cb13e5d LB |
351 | /* if this is a small write inside eof, kick off a defrag */ |
352 | if ((end - start + 1) < 16 * 1024 && | |
353 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) | |
4cb5300b CM |
354 | btrfs_add_inode_defrag(NULL, inode); |
355 | ||
42dc7bab | 356 | actual_end = min_t(u64, isize, end + 1); |
c8b97818 CM |
357 | again: |
358 | will_compress = 0; | |
359 | nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1; | |
360 | nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE); | |
be20aa9d | 361 | |
f03d9301 CM |
362 | /* |
363 | * we don't want to send crud past the end of i_size through | |
364 | * compression, that's just a waste of CPU time. So, if the | |
365 | * end of the file is before the start of our current | |
366 | * requested range of bytes, we bail out to the uncompressed | |
367 | * cleanup code that can deal with all of this. | |
368 | * | |
369 | * It isn't really the fastest way to fix things, but this is a | |
370 | * very uncommon corner. | |
371 | */ | |
372 | if (actual_end <= start) | |
373 | goto cleanup_and_bail_uncompressed; | |
374 | ||
c8b97818 CM |
375 | total_compressed = actual_end - start; |
376 | ||
377 | /* we want to make sure that amount of ram required to uncompress | |
378 | * an extent is reasonable, so we limit the total size in ram | |
771ed689 CM |
379 | * of a compressed extent to 128k. This is a crucial number |
380 | * because it also controls how easily we can spread reads across | |
381 | * cpus for decompression. | |
382 | * | |
383 | * We also want to make sure the amount of IO required to do | |
384 | * a random read is reasonably small, so we limit the size of | |
385 | * a compressed extent to 128k. | |
c8b97818 CM |
386 | */ |
387 | total_compressed = min(total_compressed, max_uncompressed); | |
db94535d | 388 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 389 | num_bytes = max(blocksize, num_bytes); |
c8b97818 CM |
390 | total_in = 0; |
391 | ret = 0; | |
db94535d | 392 | |
771ed689 CM |
393 | /* |
394 | * we do compression for mount -o compress and when the | |
395 | * inode has not been flagged as nocompress. This flag can | |
396 | * change at any time if we discover bad compression ratios. | |
c8b97818 | 397 | */ |
6cbff00f | 398 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) && |
1e701a32 | 399 | (btrfs_test_opt(root, COMPRESS) || |
75e7cb7f LB |
400 | (BTRFS_I(inode)->force_compress) || |
401 | (BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS))) { | |
c8b97818 | 402 | WARN_ON(pages); |
cfbc246e | 403 | pages = kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS); |
560f7d75 LZ |
404 | if (!pages) { |
405 | /* just bail out to the uncompressed code */ | |
406 | goto cont; | |
407 | } | |
c8b97818 | 408 | |
261507a0 LZ |
409 | if (BTRFS_I(inode)->force_compress) |
410 | compress_type = BTRFS_I(inode)->force_compress; | |
411 | ||
412 | ret = btrfs_compress_pages(compress_type, | |
413 | inode->i_mapping, start, | |
414 | total_compressed, pages, | |
415 | nr_pages, &nr_pages_ret, | |
416 | &total_in, | |
417 | &total_compressed, | |
418 | max_compressed); | |
c8b97818 CM |
419 | |
420 | if (!ret) { | |
421 | unsigned long offset = total_compressed & | |
422 | (PAGE_CACHE_SIZE - 1); | |
423 | struct page *page = pages[nr_pages_ret - 1]; | |
424 | char *kaddr; | |
425 | ||
426 | /* zero the tail end of the last page, we might be | |
427 | * sending it down to disk | |
428 | */ | |
429 | if (offset) { | |
7ac687d9 | 430 | kaddr = kmap_atomic(page); |
c8b97818 CM |
431 | memset(kaddr + offset, 0, |
432 | PAGE_CACHE_SIZE - offset); | |
7ac687d9 | 433 | kunmap_atomic(kaddr); |
c8b97818 CM |
434 | } |
435 | will_compress = 1; | |
436 | } | |
437 | } | |
560f7d75 | 438 | cont: |
c8b97818 | 439 | if (start == 0) { |
7a7eaa40 | 440 | trans = btrfs_join_transaction(root); |
79787eaa JM |
441 | if (IS_ERR(trans)) { |
442 | ret = PTR_ERR(trans); | |
443 | trans = NULL; | |
444 | goto cleanup_and_out; | |
445 | } | |
0ca1f7ce | 446 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
771ed689 | 447 | |
c8b97818 | 448 | /* lets try to make an inline extent */ |
771ed689 | 449 | if (ret || total_in < (actual_end - start)) { |
c8b97818 | 450 | /* we didn't compress the entire range, try |
771ed689 | 451 | * to make an uncompressed inline extent. |
c8b97818 CM |
452 | */ |
453 | ret = cow_file_range_inline(trans, root, inode, | |
fe3f566c | 454 | start, end, 0, 0, NULL); |
c8b97818 | 455 | } else { |
771ed689 | 456 | /* try making a compressed inline extent */ |
c8b97818 CM |
457 | ret = cow_file_range_inline(trans, root, inode, |
458 | start, end, | |
fe3f566c LZ |
459 | total_compressed, |
460 | compress_type, pages); | |
c8b97818 | 461 | } |
79787eaa | 462 | if (ret <= 0) { |
771ed689 | 463 | /* |
79787eaa JM |
464 | * inline extent creation worked or returned error, |
465 | * we don't need to create any more async work items. | |
466 | * Unlock and free up our temp pages. | |
771ed689 | 467 | */ |
c8b97818 | 468 | extent_clear_unlock_delalloc(inode, |
a791e35e CM |
469 | &BTRFS_I(inode)->io_tree, |
470 | start, end, NULL, | |
471 | EXTENT_CLEAR_UNLOCK_PAGE | EXTENT_CLEAR_DIRTY | | |
a3429ab7 | 472 | EXTENT_CLEAR_DELALLOC | |
a791e35e | 473 | EXTENT_SET_WRITEBACK | EXTENT_END_WRITEBACK); |
c2167754 YZ |
474 | |
475 | btrfs_end_transaction(trans, root); | |
c8b97818 CM |
476 | goto free_pages_out; |
477 | } | |
c2167754 | 478 | btrfs_end_transaction(trans, root); |
c8b97818 CM |
479 | } |
480 | ||
481 | if (will_compress) { | |
482 | /* | |
483 | * we aren't doing an inline extent round the compressed size | |
484 | * up to a block size boundary so the allocator does sane | |
485 | * things | |
486 | */ | |
487 | total_compressed = (total_compressed + blocksize - 1) & | |
488 | ~(blocksize - 1); | |
489 | ||
490 | /* | |
491 | * one last check to make sure the compression is really a | |
492 | * win, compare the page count read with the blocks on disk | |
493 | */ | |
494 | total_in = (total_in + PAGE_CACHE_SIZE - 1) & | |
495 | ~(PAGE_CACHE_SIZE - 1); | |
496 | if (total_compressed >= total_in) { | |
497 | will_compress = 0; | |
498 | } else { | |
c8b97818 CM |
499 | num_bytes = total_in; |
500 | } | |
501 | } | |
502 | if (!will_compress && pages) { | |
503 | /* | |
504 | * the compression code ran but failed to make things smaller, | |
505 | * free any pages it allocated and our page pointer array | |
506 | */ | |
507 | for (i = 0; i < nr_pages_ret; i++) { | |
70b99e69 | 508 | WARN_ON(pages[i]->mapping); |
c8b97818 CM |
509 | page_cache_release(pages[i]); |
510 | } | |
511 | kfree(pages); | |
512 | pages = NULL; | |
513 | total_compressed = 0; | |
514 | nr_pages_ret = 0; | |
515 | ||
516 | /* flag the file so we don't compress in the future */ | |
1e701a32 CM |
517 | if (!btrfs_test_opt(root, FORCE_COMPRESS) && |
518 | !(BTRFS_I(inode)->force_compress)) { | |
a555f810 | 519 | BTRFS_I(inode)->flags |= BTRFS_INODE_NOCOMPRESS; |
1e701a32 | 520 | } |
c8b97818 | 521 | } |
771ed689 CM |
522 | if (will_compress) { |
523 | *num_added += 1; | |
c8b97818 | 524 | |
771ed689 CM |
525 | /* the async work queues will take care of doing actual |
526 | * allocation on disk for these compressed pages, | |
527 | * and will submit them to the elevator. | |
528 | */ | |
529 | add_async_extent(async_cow, start, num_bytes, | |
261507a0 LZ |
530 | total_compressed, pages, nr_pages_ret, |
531 | compress_type); | |
179e29e4 | 532 | |
24ae6365 | 533 | if (start + num_bytes < end) { |
771ed689 CM |
534 | start += num_bytes; |
535 | pages = NULL; | |
536 | cond_resched(); | |
537 | goto again; | |
538 | } | |
539 | } else { | |
f03d9301 | 540 | cleanup_and_bail_uncompressed: |
771ed689 CM |
541 | /* |
542 | * No compression, but we still need to write the pages in | |
543 | * the file we've been given so far. redirty the locked | |
544 | * page if it corresponds to our extent and set things up | |
545 | * for the async work queue to run cow_file_range to do | |
546 | * the normal delalloc dance | |
547 | */ | |
548 | if (page_offset(locked_page) >= start && | |
549 | page_offset(locked_page) <= end) { | |
550 | __set_page_dirty_nobuffers(locked_page); | |
551 | /* unlocked later on in the async handlers */ | |
552 | } | |
261507a0 LZ |
553 | add_async_extent(async_cow, start, end - start + 1, |
554 | 0, NULL, 0, BTRFS_COMPRESS_NONE); | |
771ed689 CM |
555 | *num_added += 1; |
556 | } | |
3b951516 | 557 | |
771ed689 | 558 | out: |
79787eaa | 559 | return ret; |
771ed689 CM |
560 | |
561 | free_pages_out: | |
562 | for (i = 0; i < nr_pages_ret; i++) { | |
563 | WARN_ON(pages[i]->mapping); | |
564 | page_cache_release(pages[i]); | |
565 | } | |
d397712b | 566 | kfree(pages); |
771ed689 CM |
567 | |
568 | goto out; | |
79787eaa JM |
569 | |
570 | cleanup_and_out: | |
571 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, | |
572 | start, end, NULL, | |
573 | EXTENT_CLEAR_UNLOCK_PAGE | | |
574 | EXTENT_CLEAR_DIRTY | | |
575 | EXTENT_CLEAR_DELALLOC | | |
576 | EXTENT_SET_WRITEBACK | | |
577 | EXTENT_END_WRITEBACK); | |
578 | if (!trans || IS_ERR(trans)) | |
579 | btrfs_error(root->fs_info, ret, "Failed to join transaction"); | |
580 | else | |
581 | btrfs_abort_transaction(trans, root, ret); | |
582 | goto free_pages_out; | |
771ed689 CM |
583 | } |
584 | ||
585 | /* | |
586 | * phase two of compressed writeback. This is the ordered portion | |
587 | * of the code, which only gets called in the order the work was | |
588 | * queued. We walk all the async extents created by compress_file_range | |
589 | * and send them down to the disk. | |
590 | */ | |
591 | static noinline int submit_compressed_extents(struct inode *inode, | |
592 | struct async_cow *async_cow) | |
593 | { | |
594 | struct async_extent *async_extent; | |
595 | u64 alloc_hint = 0; | |
596 | struct btrfs_trans_handle *trans; | |
597 | struct btrfs_key ins; | |
598 | struct extent_map *em; | |
599 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
600 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
601 | struct extent_io_tree *io_tree; | |
f5a84ee3 | 602 | int ret = 0; |
771ed689 CM |
603 | |
604 | if (list_empty(&async_cow->extents)) | |
605 | return 0; | |
606 | ||
771ed689 | 607 | |
d397712b | 608 | while (!list_empty(&async_cow->extents)) { |
771ed689 CM |
609 | async_extent = list_entry(async_cow->extents.next, |
610 | struct async_extent, list); | |
611 | list_del(&async_extent->list); | |
c8b97818 | 612 | |
771ed689 CM |
613 | io_tree = &BTRFS_I(inode)->io_tree; |
614 | ||
f5a84ee3 | 615 | retry: |
771ed689 CM |
616 | /* did the compression code fall back to uncompressed IO? */ |
617 | if (!async_extent->pages) { | |
618 | int page_started = 0; | |
619 | unsigned long nr_written = 0; | |
620 | ||
621 | lock_extent(io_tree, async_extent->start, | |
2ac55d41 | 622 | async_extent->start + |
d0082371 | 623 | async_extent->ram_size - 1); |
771ed689 CM |
624 | |
625 | /* allocate blocks */ | |
f5a84ee3 JB |
626 | ret = cow_file_range(inode, async_cow->locked_page, |
627 | async_extent->start, | |
628 | async_extent->start + | |
629 | async_extent->ram_size - 1, | |
630 | &page_started, &nr_written, 0); | |
771ed689 | 631 | |
79787eaa JM |
632 | /* JDM XXX */ |
633 | ||
771ed689 CM |
634 | /* |
635 | * if page_started, cow_file_range inserted an | |
636 | * inline extent and took care of all the unlocking | |
637 | * and IO for us. Otherwise, we need to submit | |
638 | * all those pages down to the drive. | |
639 | */ | |
f5a84ee3 | 640 | if (!page_started && !ret) |
771ed689 CM |
641 | extent_write_locked_range(io_tree, |
642 | inode, async_extent->start, | |
d397712b | 643 | async_extent->start + |
771ed689 CM |
644 | async_extent->ram_size - 1, |
645 | btrfs_get_extent, | |
646 | WB_SYNC_ALL); | |
647 | kfree(async_extent); | |
648 | cond_resched(); | |
649 | continue; | |
650 | } | |
651 | ||
652 | lock_extent(io_tree, async_extent->start, | |
d0082371 | 653 | async_extent->start + async_extent->ram_size - 1); |
771ed689 | 654 | |
7a7eaa40 | 655 | trans = btrfs_join_transaction(root); |
79787eaa JM |
656 | if (IS_ERR(trans)) { |
657 | ret = PTR_ERR(trans); | |
658 | } else { | |
659 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; | |
660 | ret = btrfs_reserve_extent(trans, root, | |
771ed689 CM |
661 | async_extent->compressed_size, |
662 | async_extent->compressed_size, | |
81c9ad23 | 663 | 0, alloc_hint, &ins, 1); |
962197ba | 664 | if (ret && ret != -ENOSPC) |
79787eaa JM |
665 | btrfs_abort_transaction(trans, root, ret); |
666 | btrfs_end_transaction(trans, root); | |
667 | } | |
c2167754 | 668 | |
f5a84ee3 JB |
669 | if (ret) { |
670 | int i; | |
671 | for (i = 0; i < async_extent->nr_pages; i++) { | |
672 | WARN_ON(async_extent->pages[i]->mapping); | |
673 | page_cache_release(async_extent->pages[i]); | |
674 | } | |
675 | kfree(async_extent->pages); | |
676 | async_extent->nr_pages = 0; | |
677 | async_extent->pages = NULL; | |
678 | unlock_extent(io_tree, async_extent->start, | |
679 | async_extent->start + | |
d0082371 | 680 | async_extent->ram_size - 1); |
79787eaa JM |
681 | if (ret == -ENOSPC) |
682 | goto retry; | |
683 | goto out_free; /* JDM: Requeue? */ | |
f5a84ee3 JB |
684 | } |
685 | ||
c2167754 YZ |
686 | /* |
687 | * here we're doing allocation and writeback of the | |
688 | * compressed pages | |
689 | */ | |
690 | btrfs_drop_extent_cache(inode, async_extent->start, | |
691 | async_extent->start + | |
692 | async_extent->ram_size - 1, 0); | |
693 | ||
172ddd60 | 694 | em = alloc_extent_map(); |
79787eaa | 695 | BUG_ON(!em); /* -ENOMEM */ |
771ed689 CM |
696 | em->start = async_extent->start; |
697 | em->len = async_extent->ram_size; | |
445a6944 | 698 | em->orig_start = em->start; |
c8b97818 | 699 | |
771ed689 CM |
700 | em->block_start = ins.objectid; |
701 | em->block_len = ins.offset; | |
702 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
261507a0 | 703 | em->compress_type = async_extent->compress_type; |
771ed689 CM |
704 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
705 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); | |
706 | ||
d397712b | 707 | while (1) { |
890871be | 708 | write_lock(&em_tree->lock); |
771ed689 | 709 | ret = add_extent_mapping(em_tree, em); |
890871be | 710 | write_unlock(&em_tree->lock); |
771ed689 CM |
711 | if (ret != -EEXIST) { |
712 | free_extent_map(em); | |
713 | break; | |
714 | } | |
715 | btrfs_drop_extent_cache(inode, async_extent->start, | |
716 | async_extent->start + | |
717 | async_extent->ram_size - 1, 0); | |
718 | } | |
719 | ||
261507a0 LZ |
720 | ret = btrfs_add_ordered_extent_compress(inode, |
721 | async_extent->start, | |
722 | ins.objectid, | |
723 | async_extent->ram_size, | |
724 | ins.offset, | |
725 | BTRFS_ORDERED_COMPRESSED, | |
726 | async_extent->compress_type); | |
79787eaa | 727 | BUG_ON(ret); /* -ENOMEM */ |
771ed689 | 728 | |
771ed689 CM |
729 | /* |
730 | * clear dirty, set writeback and unlock the pages. | |
731 | */ | |
732 | extent_clear_unlock_delalloc(inode, | |
a791e35e CM |
733 | &BTRFS_I(inode)->io_tree, |
734 | async_extent->start, | |
735 | async_extent->start + | |
736 | async_extent->ram_size - 1, | |
737 | NULL, EXTENT_CLEAR_UNLOCK_PAGE | | |
738 | EXTENT_CLEAR_UNLOCK | | |
a3429ab7 | 739 | EXTENT_CLEAR_DELALLOC | |
a791e35e | 740 | EXTENT_CLEAR_DIRTY | EXTENT_SET_WRITEBACK); |
771ed689 CM |
741 | |
742 | ret = btrfs_submit_compressed_write(inode, | |
d397712b CM |
743 | async_extent->start, |
744 | async_extent->ram_size, | |
745 | ins.objectid, | |
746 | ins.offset, async_extent->pages, | |
747 | async_extent->nr_pages); | |
771ed689 | 748 | |
79787eaa | 749 | BUG_ON(ret); /* -ENOMEM */ |
771ed689 CM |
750 | alloc_hint = ins.objectid + ins.offset; |
751 | kfree(async_extent); | |
752 | cond_resched(); | |
753 | } | |
79787eaa JM |
754 | ret = 0; |
755 | out: | |
756 | return ret; | |
757 | out_free: | |
758 | kfree(async_extent); | |
759 | goto out; | |
771ed689 CM |
760 | } |
761 | ||
4b46fce2 JB |
762 | static u64 get_extent_allocation_hint(struct inode *inode, u64 start, |
763 | u64 num_bytes) | |
764 | { | |
765 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
766 | struct extent_map *em; | |
767 | u64 alloc_hint = 0; | |
768 | ||
769 | read_lock(&em_tree->lock); | |
770 | em = search_extent_mapping(em_tree, start, num_bytes); | |
771 | if (em) { | |
772 | /* | |
773 | * if block start isn't an actual block number then find the | |
774 | * first block in this inode and use that as a hint. If that | |
775 | * block is also bogus then just don't worry about it. | |
776 | */ | |
777 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { | |
778 | free_extent_map(em); | |
779 | em = search_extent_mapping(em_tree, 0, 0); | |
780 | if (em && em->block_start < EXTENT_MAP_LAST_BYTE) | |
781 | alloc_hint = em->block_start; | |
782 | if (em) | |
783 | free_extent_map(em); | |
784 | } else { | |
785 | alloc_hint = em->block_start; | |
786 | free_extent_map(em); | |
787 | } | |
788 | } | |
789 | read_unlock(&em_tree->lock); | |
790 | ||
791 | return alloc_hint; | |
792 | } | |
793 | ||
771ed689 CM |
794 | /* |
795 | * when extent_io.c finds a delayed allocation range in the file, | |
796 | * the call backs end up in this code. The basic idea is to | |
797 | * allocate extents on disk for the range, and create ordered data structs | |
798 | * in ram to track those extents. | |
799 | * | |
800 | * locked_page is the page that writepage had locked already. We use | |
801 | * it to make sure we don't do extra locks or unlocks. | |
802 | * | |
803 | * *page_started is set to one if we unlock locked_page and do everything | |
804 | * required to start IO on it. It may be clean and already done with | |
805 | * IO when we return. | |
806 | */ | |
b7d5b0a8 MX |
807 | static noinline int __cow_file_range(struct btrfs_trans_handle *trans, |
808 | struct inode *inode, | |
809 | struct btrfs_root *root, | |
810 | struct page *locked_page, | |
811 | u64 start, u64 end, int *page_started, | |
812 | unsigned long *nr_written, | |
813 | int unlock) | |
771ed689 | 814 | { |
771ed689 CM |
815 | u64 alloc_hint = 0; |
816 | u64 num_bytes; | |
817 | unsigned long ram_size; | |
818 | u64 disk_num_bytes; | |
819 | u64 cur_alloc_size; | |
820 | u64 blocksize = root->sectorsize; | |
771ed689 CM |
821 | struct btrfs_key ins; |
822 | struct extent_map *em; | |
823 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
824 | int ret = 0; | |
825 | ||
83eea1f1 | 826 | BUG_ON(btrfs_is_free_space_inode(inode)); |
771ed689 | 827 | |
771ed689 CM |
828 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
829 | num_bytes = max(blocksize, num_bytes); | |
830 | disk_num_bytes = num_bytes; | |
771ed689 | 831 | |
4cb5300b | 832 | /* if this is a small write inside eof, kick off defrag */ |
4cb13e5d LB |
833 | if (num_bytes < 64 * 1024 && |
834 | (start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size)) | |
4cb5300b CM |
835 | btrfs_add_inode_defrag(trans, inode); |
836 | ||
771ed689 CM |
837 | if (start == 0) { |
838 | /* lets try to make an inline extent */ | |
839 | ret = cow_file_range_inline(trans, root, inode, | |
fe3f566c | 840 | start, end, 0, 0, NULL); |
771ed689 CM |
841 | if (ret == 0) { |
842 | extent_clear_unlock_delalloc(inode, | |
a791e35e CM |
843 | &BTRFS_I(inode)->io_tree, |
844 | start, end, NULL, | |
845 | EXTENT_CLEAR_UNLOCK_PAGE | | |
846 | EXTENT_CLEAR_UNLOCK | | |
847 | EXTENT_CLEAR_DELALLOC | | |
848 | EXTENT_CLEAR_DIRTY | | |
849 | EXTENT_SET_WRITEBACK | | |
850 | EXTENT_END_WRITEBACK); | |
c2167754 | 851 | |
771ed689 CM |
852 | *nr_written = *nr_written + |
853 | (end - start + PAGE_CACHE_SIZE) / PAGE_CACHE_SIZE; | |
854 | *page_started = 1; | |
771ed689 | 855 | goto out; |
79787eaa JM |
856 | } else if (ret < 0) { |
857 | btrfs_abort_transaction(trans, root, ret); | |
858 | goto out_unlock; | |
771ed689 CM |
859 | } |
860 | } | |
861 | ||
862 | BUG_ON(disk_num_bytes > | |
6c41761f | 863 | btrfs_super_total_bytes(root->fs_info->super_copy)); |
771ed689 | 864 | |
4b46fce2 | 865 | alloc_hint = get_extent_allocation_hint(inode, start, num_bytes); |
771ed689 CM |
866 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1, 0); |
867 | ||
d397712b | 868 | while (disk_num_bytes > 0) { |
a791e35e CM |
869 | unsigned long op; |
870 | ||
287a0ab9 | 871 | cur_alloc_size = disk_num_bytes; |
e6dcd2dc | 872 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
771ed689 | 873 | root->sectorsize, 0, alloc_hint, |
81c9ad23 | 874 | &ins, 1); |
79787eaa JM |
875 | if (ret < 0) { |
876 | btrfs_abort_transaction(trans, root, ret); | |
877 | goto out_unlock; | |
878 | } | |
d397712b | 879 | |
172ddd60 | 880 | em = alloc_extent_map(); |
79787eaa | 881 | BUG_ON(!em); /* -ENOMEM */ |
e6dcd2dc | 882 | em->start = start; |
445a6944 | 883 | em->orig_start = em->start; |
771ed689 CM |
884 | ram_size = ins.offset; |
885 | em->len = ins.offset; | |
c8b97818 | 886 | |
e6dcd2dc | 887 | em->block_start = ins.objectid; |
c8b97818 | 888 | em->block_len = ins.offset; |
e6dcd2dc | 889 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
7f3c74fb | 890 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
c8b97818 | 891 | |
d397712b | 892 | while (1) { |
890871be | 893 | write_lock(&em_tree->lock); |
e6dcd2dc | 894 | ret = add_extent_mapping(em_tree, em); |
890871be | 895 | write_unlock(&em_tree->lock); |
e6dcd2dc CM |
896 | if (ret != -EEXIST) { |
897 | free_extent_map(em); | |
898 | break; | |
899 | } | |
900 | btrfs_drop_extent_cache(inode, start, | |
c8b97818 | 901 | start + ram_size - 1, 0); |
e6dcd2dc CM |
902 | } |
903 | ||
98d20f67 | 904 | cur_alloc_size = ins.offset; |
e6dcd2dc | 905 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
771ed689 | 906 | ram_size, cur_alloc_size, 0); |
79787eaa | 907 | BUG_ON(ret); /* -ENOMEM */ |
c8b97818 | 908 | |
17d217fe YZ |
909 | if (root->root_key.objectid == |
910 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
911 | ret = btrfs_reloc_clone_csums(inode, start, | |
912 | cur_alloc_size); | |
79787eaa JM |
913 | if (ret) { |
914 | btrfs_abort_transaction(trans, root, ret); | |
915 | goto out_unlock; | |
916 | } | |
17d217fe YZ |
917 | } |
918 | ||
d397712b | 919 | if (disk_num_bytes < cur_alloc_size) |
3b951516 | 920 | break; |
d397712b | 921 | |
c8b97818 CM |
922 | /* we're not doing compressed IO, don't unlock the first |
923 | * page (which the caller expects to stay locked), don't | |
924 | * clear any dirty bits and don't set any writeback bits | |
8b62b72b CM |
925 | * |
926 | * Do set the Private2 bit so we know this page was properly | |
927 | * setup for writepage | |
c8b97818 | 928 | */ |
a791e35e CM |
929 | op = unlock ? EXTENT_CLEAR_UNLOCK_PAGE : 0; |
930 | op |= EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | | |
931 | EXTENT_SET_PRIVATE2; | |
932 | ||
c8b97818 CM |
933 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
934 | start, start + ram_size - 1, | |
a791e35e | 935 | locked_page, op); |
c8b97818 | 936 | disk_num_bytes -= cur_alloc_size; |
c59f8951 CM |
937 | num_bytes -= cur_alloc_size; |
938 | alloc_hint = ins.objectid + ins.offset; | |
939 | start += cur_alloc_size; | |
b888db2b | 940 | } |
79787eaa | 941 | out: |
be20aa9d | 942 | return ret; |
b7d5b0a8 | 943 | |
79787eaa JM |
944 | out_unlock: |
945 | extent_clear_unlock_delalloc(inode, | |
946 | &BTRFS_I(inode)->io_tree, | |
beb42dd7 | 947 | start, end, locked_page, |
79787eaa JM |
948 | EXTENT_CLEAR_UNLOCK_PAGE | |
949 | EXTENT_CLEAR_UNLOCK | | |
950 | EXTENT_CLEAR_DELALLOC | | |
951 | EXTENT_CLEAR_DIRTY | | |
952 | EXTENT_SET_WRITEBACK | | |
953 | EXTENT_END_WRITEBACK); | |
954 | ||
955 | goto out; | |
771ed689 | 956 | } |
c8b97818 | 957 | |
b7d5b0a8 MX |
958 | static noinline int cow_file_range(struct inode *inode, |
959 | struct page *locked_page, | |
960 | u64 start, u64 end, int *page_started, | |
961 | unsigned long *nr_written, | |
962 | int unlock) | |
963 | { | |
964 | struct btrfs_trans_handle *trans; | |
965 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
966 | int ret; | |
967 | ||
968 | trans = btrfs_join_transaction(root); | |
969 | if (IS_ERR(trans)) { | |
970 | extent_clear_unlock_delalloc(inode, | |
971 | &BTRFS_I(inode)->io_tree, | |
972 | start, end, locked_page, | |
973 | EXTENT_CLEAR_UNLOCK_PAGE | | |
974 | EXTENT_CLEAR_UNLOCK | | |
975 | EXTENT_CLEAR_DELALLOC | | |
976 | EXTENT_CLEAR_DIRTY | | |
977 | EXTENT_SET_WRITEBACK | | |
978 | EXTENT_END_WRITEBACK); | |
979 | return PTR_ERR(trans); | |
980 | } | |
981 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; | |
982 | ||
983 | ret = __cow_file_range(trans, inode, root, locked_page, start, end, | |
984 | page_started, nr_written, unlock); | |
985 | ||
986 | btrfs_end_transaction(trans, root); | |
987 | ||
988 | return ret; | |
989 | } | |
990 | ||
771ed689 CM |
991 | /* |
992 | * work queue call back to started compression on a file and pages | |
993 | */ | |
994 | static noinline void async_cow_start(struct btrfs_work *work) | |
995 | { | |
996 | struct async_cow *async_cow; | |
997 | int num_added = 0; | |
998 | async_cow = container_of(work, struct async_cow, work); | |
999 | ||
1000 | compress_file_range(async_cow->inode, async_cow->locked_page, | |
1001 | async_cow->start, async_cow->end, async_cow, | |
1002 | &num_added); | |
8180ef88 | 1003 | if (num_added == 0) { |
cb77fcd8 | 1004 | btrfs_add_delayed_iput(async_cow->inode); |
771ed689 | 1005 | async_cow->inode = NULL; |
8180ef88 | 1006 | } |
771ed689 CM |
1007 | } |
1008 | ||
1009 | /* | |
1010 | * work queue call back to submit previously compressed pages | |
1011 | */ | |
1012 | static noinline void async_cow_submit(struct btrfs_work *work) | |
1013 | { | |
1014 | struct async_cow *async_cow; | |
1015 | struct btrfs_root *root; | |
1016 | unsigned long nr_pages; | |
1017 | ||
1018 | async_cow = container_of(work, struct async_cow, work); | |
1019 | ||
1020 | root = async_cow->root; | |
1021 | nr_pages = (async_cow->end - async_cow->start + PAGE_CACHE_SIZE) >> | |
1022 | PAGE_CACHE_SHIFT; | |
1023 | ||
66657b31 | 1024 | if (atomic_sub_return(nr_pages, &root->fs_info->async_delalloc_pages) < |
287082b0 | 1025 | 5 * 1024 * 1024 && |
771ed689 CM |
1026 | waitqueue_active(&root->fs_info->async_submit_wait)) |
1027 | wake_up(&root->fs_info->async_submit_wait); | |
1028 | ||
d397712b | 1029 | if (async_cow->inode) |
771ed689 | 1030 | submit_compressed_extents(async_cow->inode, async_cow); |
771ed689 | 1031 | } |
c8b97818 | 1032 | |
771ed689 CM |
1033 | static noinline void async_cow_free(struct btrfs_work *work) |
1034 | { | |
1035 | struct async_cow *async_cow; | |
1036 | async_cow = container_of(work, struct async_cow, work); | |
8180ef88 | 1037 | if (async_cow->inode) |
cb77fcd8 | 1038 | btrfs_add_delayed_iput(async_cow->inode); |
771ed689 CM |
1039 | kfree(async_cow); |
1040 | } | |
1041 | ||
1042 | static int cow_file_range_async(struct inode *inode, struct page *locked_page, | |
1043 | u64 start, u64 end, int *page_started, | |
1044 | unsigned long *nr_written) | |
1045 | { | |
1046 | struct async_cow *async_cow; | |
1047 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1048 | unsigned long nr_pages; | |
1049 | u64 cur_end; | |
287082b0 | 1050 | int limit = 10 * 1024 * 1024; |
771ed689 | 1051 | |
a3429ab7 CM |
1052 | clear_extent_bit(&BTRFS_I(inode)->io_tree, start, end, EXTENT_LOCKED, |
1053 | 1, 0, NULL, GFP_NOFS); | |
d397712b | 1054 | while (start < end) { |
771ed689 | 1055 | async_cow = kmalloc(sizeof(*async_cow), GFP_NOFS); |
79787eaa | 1056 | BUG_ON(!async_cow); /* -ENOMEM */ |
8180ef88 | 1057 | async_cow->inode = igrab(inode); |
771ed689 CM |
1058 | async_cow->root = root; |
1059 | async_cow->locked_page = locked_page; | |
1060 | async_cow->start = start; | |
1061 | ||
6cbff00f | 1062 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NOCOMPRESS) |
771ed689 CM |
1063 | cur_end = end; |
1064 | else | |
1065 | cur_end = min(end, start + 512 * 1024 - 1); | |
1066 | ||
1067 | async_cow->end = cur_end; | |
1068 | INIT_LIST_HEAD(&async_cow->extents); | |
1069 | ||
1070 | async_cow->work.func = async_cow_start; | |
1071 | async_cow->work.ordered_func = async_cow_submit; | |
1072 | async_cow->work.ordered_free = async_cow_free; | |
1073 | async_cow->work.flags = 0; | |
1074 | ||
771ed689 CM |
1075 | nr_pages = (cur_end - start + PAGE_CACHE_SIZE) >> |
1076 | PAGE_CACHE_SHIFT; | |
1077 | atomic_add(nr_pages, &root->fs_info->async_delalloc_pages); | |
1078 | ||
1079 | btrfs_queue_worker(&root->fs_info->delalloc_workers, | |
1080 | &async_cow->work); | |
1081 | ||
1082 | if (atomic_read(&root->fs_info->async_delalloc_pages) > limit) { | |
1083 | wait_event(root->fs_info->async_submit_wait, | |
1084 | (atomic_read(&root->fs_info->async_delalloc_pages) < | |
1085 | limit)); | |
1086 | } | |
1087 | ||
d397712b | 1088 | while (atomic_read(&root->fs_info->async_submit_draining) && |
771ed689 CM |
1089 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
1090 | wait_event(root->fs_info->async_submit_wait, | |
1091 | (atomic_read(&root->fs_info->async_delalloc_pages) == | |
1092 | 0)); | |
1093 | } | |
1094 | ||
1095 | *nr_written += nr_pages; | |
1096 | start = cur_end + 1; | |
1097 | } | |
1098 | *page_started = 1; | |
1099 | return 0; | |
be20aa9d CM |
1100 | } |
1101 | ||
d397712b | 1102 | static noinline int csum_exist_in_range(struct btrfs_root *root, |
17d217fe YZ |
1103 | u64 bytenr, u64 num_bytes) |
1104 | { | |
1105 | int ret; | |
1106 | struct btrfs_ordered_sum *sums; | |
1107 | LIST_HEAD(list); | |
1108 | ||
07d400a6 | 1109 | ret = btrfs_lookup_csums_range(root->fs_info->csum_root, bytenr, |
a2de733c | 1110 | bytenr + num_bytes - 1, &list, 0); |
17d217fe YZ |
1111 | if (ret == 0 && list_empty(&list)) |
1112 | return 0; | |
1113 | ||
1114 | while (!list_empty(&list)) { | |
1115 | sums = list_entry(list.next, struct btrfs_ordered_sum, list); | |
1116 | list_del(&sums->list); | |
1117 | kfree(sums); | |
1118 | } | |
1119 | return 1; | |
1120 | } | |
1121 | ||
d352ac68 CM |
1122 | /* |
1123 | * when nowcow writeback call back. This checks for snapshots or COW copies | |
1124 | * of the extents that exist in the file, and COWs the file as required. | |
1125 | * | |
1126 | * If no cow copies or snapshots exist, we write directly to the existing | |
1127 | * blocks on disk | |
1128 | */ | |
7f366cfe CM |
1129 | static noinline int run_delalloc_nocow(struct inode *inode, |
1130 | struct page *locked_page, | |
771ed689 CM |
1131 | u64 start, u64 end, int *page_started, int force, |
1132 | unsigned long *nr_written) | |
be20aa9d | 1133 | { |
be20aa9d | 1134 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7ea394f1 | 1135 | struct btrfs_trans_handle *trans; |
be20aa9d | 1136 | struct extent_buffer *leaf; |
be20aa9d | 1137 | struct btrfs_path *path; |
80ff3856 | 1138 | struct btrfs_file_extent_item *fi; |
be20aa9d | 1139 | struct btrfs_key found_key; |
80ff3856 YZ |
1140 | u64 cow_start; |
1141 | u64 cur_offset; | |
1142 | u64 extent_end; | |
5d4f98a2 | 1143 | u64 extent_offset; |
80ff3856 YZ |
1144 | u64 disk_bytenr; |
1145 | u64 num_bytes; | |
1146 | int extent_type; | |
79787eaa | 1147 | int ret, err; |
d899e052 | 1148 | int type; |
80ff3856 YZ |
1149 | int nocow; |
1150 | int check_prev = 1; | |
82d5902d | 1151 | bool nolock; |
33345d01 | 1152 | u64 ino = btrfs_ino(inode); |
be20aa9d CM |
1153 | |
1154 | path = btrfs_alloc_path(); | |
17ca04af JB |
1155 | if (!path) { |
1156 | extent_clear_unlock_delalloc(inode, | |
1157 | &BTRFS_I(inode)->io_tree, | |
1158 | start, end, locked_page, | |
1159 | EXTENT_CLEAR_UNLOCK_PAGE | | |
1160 | EXTENT_CLEAR_UNLOCK | | |
1161 | EXTENT_CLEAR_DELALLOC | | |
1162 | EXTENT_CLEAR_DIRTY | | |
1163 | EXTENT_SET_WRITEBACK | | |
1164 | EXTENT_END_WRITEBACK); | |
d8926bb3 | 1165 | return -ENOMEM; |
17ca04af | 1166 | } |
82d5902d | 1167 | |
83eea1f1 | 1168 | nolock = btrfs_is_free_space_inode(inode); |
82d5902d LZ |
1169 | |
1170 | if (nolock) | |
7a7eaa40 | 1171 | trans = btrfs_join_transaction_nolock(root); |
82d5902d | 1172 | else |
7a7eaa40 | 1173 | trans = btrfs_join_transaction(root); |
ff5714cc | 1174 | |
79787eaa | 1175 | if (IS_ERR(trans)) { |
17ca04af JB |
1176 | extent_clear_unlock_delalloc(inode, |
1177 | &BTRFS_I(inode)->io_tree, | |
1178 | start, end, locked_page, | |
1179 | EXTENT_CLEAR_UNLOCK_PAGE | | |
1180 | EXTENT_CLEAR_UNLOCK | | |
1181 | EXTENT_CLEAR_DELALLOC | | |
1182 | EXTENT_CLEAR_DIRTY | | |
1183 | EXTENT_SET_WRITEBACK | | |
1184 | EXTENT_END_WRITEBACK); | |
79787eaa JM |
1185 | btrfs_free_path(path); |
1186 | return PTR_ERR(trans); | |
1187 | } | |
1188 | ||
74b21075 | 1189 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
be20aa9d | 1190 | |
80ff3856 YZ |
1191 | cow_start = (u64)-1; |
1192 | cur_offset = start; | |
1193 | while (1) { | |
33345d01 | 1194 | ret = btrfs_lookup_file_extent(trans, root, path, ino, |
80ff3856 | 1195 | cur_offset, 0); |
79787eaa JM |
1196 | if (ret < 0) { |
1197 | btrfs_abort_transaction(trans, root, ret); | |
1198 | goto error; | |
1199 | } | |
80ff3856 YZ |
1200 | if (ret > 0 && path->slots[0] > 0 && check_prev) { |
1201 | leaf = path->nodes[0]; | |
1202 | btrfs_item_key_to_cpu(leaf, &found_key, | |
1203 | path->slots[0] - 1); | |
33345d01 | 1204 | if (found_key.objectid == ino && |
80ff3856 YZ |
1205 | found_key.type == BTRFS_EXTENT_DATA_KEY) |
1206 | path->slots[0]--; | |
1207 | } | |
1208 | check_prev = 0; | |
1209 | next_slot: | |
1210 | leaf = path->nodes[0]; | |
1211 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
1212 | ret = btrfs_next_leaf(root, path); | |
79787eaa JM |
1213 | if (ret < 0) { |
1214 | btrfs_abort_transaction(trans, root, ret); | |
1215 | goto error; | |
1216 | } | |
80ff3856 YZ |
1217 | if (ret > 0) |
1218 | break; | |
1219 | leaf = path->nodes[0]; | |
1220 | } | |
be20aa9d | 1221 | |
80ff3856 YZ |
1222 | nocow = 0; |
1223 | disk_bytenr = 0; | |
17d217fe | 1224 | num_bytes = 0; |
80ff3856 YZ |
1225 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1226 | ||
33345d01 | 1227 | if (found_key.objectid > ino || |
80ff3856 YZ |
1228 | found_key.type > BTRFS_EXTENT_DATA_KEY || |
1229 | found_key.offset > end) | |
1230 | break; | |
1231 | ||
1232 | if (found_key.offset > cur_offset) { | |
1233 | extent_end = found_key.offset; | |
e9061e21 | 1234 | extent_type = 0; |
80ff3856 YZ |
1235 | goto out_check; |
1236 | } | |
1237 | ||
1238 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1239 | struct btrfs_file_extent_item); | |
1240 | extent_type = btrfs_file_extent_type(leaf, fi); | |
1241 | ||
d899e052 YZ |
1242 | if (extent_type == BTRFS_FILE_EXTENT_REG || |
1243 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
80ff3856 | 1244 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); |
5d4f98a2 | 1245 | extent_offset = btrfs_file_extent_offset(leaf, fi); |
80ff3856 YZ |
1246 | extent_end = found_key.offset + |
1247 | btrfs_file_extent_num_bytes(leaf, fi); | |
1248 | if (extent_end <= start) { | |
1249 | path->slots[0]++; | |
1250 | goto next_slot; | |
1251 | } | |
17d217fe YZ |
1252 | if (disk_bytenr == 0) |
1253 | goto out_check; | |
80ff3856 YZ |
1254 | if (btrfs_file_extent_compression(leaf, fi) || |
1255 | btrfs_file_extent_encryption(leaf, fi) || | |
1256 | btrfs_file_extent_other_encoding(leaf, fi)) | |
1257 | goto out_check; | |
d899e052 YZ |
1258 | if (extent_type == BTRFS_FILE_EXTENT_REG && !force) |
1259 | goto out_check; | |
d2fb3437 | 1260 | if (btrfs_extent_readonly(root, disk_bytenr)) |
80ff3856 | 1261 | goto out_check; |
33345d01 | 1262 | if (btrfs_cross_ref_exist(trans, root, ino, |
5d4f98a2 YZ |
1263 | found_key.offset - |
1264 | extent_offset, disk_bytenr)) | |
17d217fe | 1265 | goto out_check; |
5d4f98a2 | 1266 | disk_bytenr += extent_offset; |
17d217fe YZ |
1267 | disk_bytenr += cur_offset - found_key.offset; |
1268 | num_bytes = min(end + 1, extent_end) - cur_offset; | |
1269 | /* | |
1270 | * force cow if csum exists in the range. | |
1271 | * this ensure that csum for a given extent are | |
1272 | * either valid or do not exist. | |
1273 | */ | |
1274 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) | |
1275 | goto out_check; | |
80ff3856 YZ |
1276 | nocow = 1; |
1277 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
1278 | extent_end = found_key.offset + | |
1279 | btrfs_file_extent_inline_len(leaf, fi); | |
1280 | extent_end = ALIGN(extent_end, root->sectorsize); | |
1281 | } else { | |
1282 | BUG_ON(1); | |
1283 | } | |
1284 | out_check: | |
1285 | if (extent_end <= start) { | |
1286 | path->slots[0]++; | |
1287 | goto next_slot; | |
1288 | } | |
1289 | if (!nocow) { | |
1290 | if (cow_start == (u64)-1) | |
1291 | cow_start = cur_offset; | |
1292 | cur_offset = extent_end; | |
1293 | if (cur_offset > end) | |
1294 | break; | |
1295 | path->slots[0]++; | |
1296 | goto next_slot; | |
7ea394f1 YZ |
1297 | } |
1298 | ||
b3b4aa74 | 1299 | btrfs_release_path(path); |
80ff3856 | 1300 | if (cow_start != (u64)-1) { |
b7d5b0a8 MX |
1301 | ret = __cow_file_range(trans, inode, root, locked_page, |
1302 | cow_start, found_key.offset - 1, | |
1303 | page_started, nr_written, 1); | |
79787eaa JM |
1304 | if (ret) { |
1305 | btrfs_abort_transaction(trans, root, ret); | |
1306 | goto error; | |
1307 | } | |
80ff3856 | 1308 | cow_start = (u64)-1; |
7ea394f1 | 1309 | } |
80ff3856 | 1310 | |
d899e052 YZ |
1311 | if (extent_type == BTRFS_FILE_EXTENT_PREALLOC) { |
1312 | struct extent_map *em; | |
1313 | struct extent_map_tree *em_tree; | |
1314 | em_tree = &BTRFS_I(inode)->extent_tree; | |
172ddd60 | 1315 | em = alloc_extent_map(); |
79787eaa | 1316 | BUG_ON(!em); /* -ENOMEM */ |
d899e052 | 1317 | em->start = cur_offset; |
445a6944 | 1318 | em->orig_start = em->start; |
d899e052 YZ |
1319 | em->len = num_bytes; |
1320 | em->block_len = num_bytes; | |
1321 | em->block_start = disk_bytenr; | |
1322 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
1323 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
4e2f84e6 | 1324 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); |
d899e052 | 1325 | while (1) { |
890871be | 1326 | write_lock(&em_tree->lock); |
d899e052 | 1327 | ret = add_extent_mapping(em_tree, em); |
890871be | 1328 | write_unlock(&em_tree->lock); |
d899e052 YZ |
1329 | if (ret != -EEXIST) { |
1330 | free_extent_map(em); | |
1331 | break; | |
1332 | } | |
1333 | btrfs_drop_extent_cache(inode, em->start, | |
1334 | em->start + em->len - 1, 0); | |
1335 | } | |
1336 | type = BTRFS_ORDERED_PREALLOC; | |
1337 | } else { | |
1338 | type = BTRFS_ORDERED_NOCOW; | |
1339 | } | |
80ff3856 YZ |
1340 | |
1341 | ret = btrfs_add_ordered_extent(inode, cur_offset, disk_bytenr, | |
d899e052 | 1342 | num_bytes, num_bytes, type); |
79787eaa | 1343 | BUG_ON(ret); /* -ENOMEM */ |
771ed689 | 1344 | |
efa56464 YZ |
1345 | if (root->root_key.objectid == |
1346 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
1347 | ret = btrfs_reloc_clone_csums(inode, cur_offset, | |
1348 | num_bytes); | |
79787eaa JM |
1349 | if (ret) { |
1350 | btrfs_abort_transaction(trans, root, ret); | |
1351 | goto error; | |
1352 | } | |
efa56464 YZ |
1353 | } |
1354 | ||
d899e052 | 1355 | extent_clear_unlock_delalloc(inode, &BTRFS_I(inode)->io_tree, |
a791e35e CM |
1356 | cur_offset, cur_offset + num_bytes - 1, |
1357 | locked_page, EXTENT_CLEAR_UNLOCK_PAGE | | |
1358 | EXTENT_CLEAR_UNLOCK | EXTENT_CLEAR_DELALLOC | | |
1359 | EXTENT_SET_PRIVATE2); | |
80ff3856 YZ |
1360 | cur_offset = extent_end; |
1361 | if (cur_offset > end) | |
1362 | break; | |
be20aa9d | 1363 | } |
b3b4aa74 | 1364 | btrfs_release_path(path); |
80ff3856 | 1365 | |
17ca04af | 1366 | if (cur_offset <= end && cow_start == (u64)-1) { |
80ff3856 | 1367 | cow_start = cur_offset; |
17ca04af JB |
1368 | cur_offset = end; |
1369 | } | |
1370 | ||
80ff3856 | 1371 | if (cow_start != (u64)-1) { |
b7d5b0a8 MX |
1372 | ret = __cow_file_range(trans, inode, root, locked_page, |
1373 | cow_start, end, | |
1374 | page_started, nr_written, 1); | |
79787eaa JM |
1375 | if (ret) { |
1376 | btrfs_abort_transaction(trans, root, ret); | |
1377 | goto error; | |
1378 | } | |
80ff3856 YZ |
1379 | } |
1380 | ||
79787eaa | 1381 | error: |
a698d075 | 1382 | err = btrfs_end_transaction(trans, root); |
79787eaa JM |
1383 | if (!ret) |
1384 | ret = err; | |
1385 | ||
17ca04af JB |
1386 | if (ret && cur_offset < end) |
1387 | extent_clear_unlock_delalloc(inode, | |
1388 | &BTRFS_I(inode)->io_tree, | |
1389 | cur_offset, end, locked_page, | |
1390 | EXTENT_CLEAR_UNLOCK_PAGE | | |
1391 | EXTENT_CLEAR_UNLOCK | | |
1392 | EXTENT_CLEAR_DELALLOC | | |
1393 | EXTENT_CLEAR_DIRTY | | |
1394 | EXTENT_SET_WRITEBACK | | |
1395 | EXTENT_END_WRITEBACK); | |
1396 | ||
7ea394f1 | 1397 | btrfs_free_path(path); |
79787eaa | 1398 | return ret; |
be20aa9d CM |
1399 | } |
1400 | ||
d352ac68 CM |
1401 | /* |
1402 | * extent_io.c call back to do delayed allocation processing | |
1403 | */ | |
c8b97818 | 1404 | static int run_delalloc_range(struct inode *inode, struct page *locked_page, |
771ed689 CM |
1405 | u64 start, u64 end, int *page_started, |
1406 | unsigned long *nr_written) | |
be20aa9d | 1407 | { |
be20aa9d | 1408 | int ret; |
7f366cfe | 1409 | struct btrfs_root *root = BTRFS_I(inode)->root; |
a2135011 | 1410 | |
7ddf5a42 | 1411 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) { |
c8b97818 | 1412 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1413 | page_started, 1, nr_written); |
7ddf5a42 | 1414 | } else if (BTRFS_I(inode)->flags & BTRFS_INODE_PREALLOC) { |
d899e052 | 1415 | ret = run_delalloc_nocow(inode, locked_page, start, end, |
d397712b | 1416 | page_started, 0, nr_written); |
7ddf5a42 JB |
1417 | } else if (!btrfs_test_opt(root, COMPRESS) && |
1418 | !(BTRFS_I(inode)->force_compress) && | |
1419 | !(BTRFS_I(inode)->flags & BTRFS_INODE_COMPRESS)) { | |
7f366cfe CM |
1420 | ret = cow_file_range(inode, locked_page, start, end, |
1421 | page_started, nr_written, 1); | |
7ddf5a42 JB |
1422 | } else { |
1423 | set_bit(BTRFS_INODE_HAS_ASYNC_EXTENT, | |
1424 | &BTRFS_I(inode)->runtime_flags); | |
771ed689 | 1425 | ret = cow_file_range_async(inode, locked_page, start, end, |
d397712b | 1426 | page_started, nr_written); |
7ddf5a42 | 1427 | } |
b888db2b CM |
1428 | return ret; |
1429 | } | |
1430 | ||
1bf85046 JM |
1431 | static void btrfs_split_extent_hook(struct inode *inode, |
1432 | struct extent_state *orig, u64 split) | |
9ed74f2d | 1433 | { |
0ca1f7ce | 1434 | /* not delalloc, ignore it */ |
9ed74f2d | 1435 | if (!(orig->state & EXTENT_DELALLOC)) |
1bf85046 | 1436 | return; |
9ed74f2d | 1437 | |
9e0baf60 JB |
1438 | spin_lock(&BTRFS_I(inode)->lock); |
1439 | BTRFS_I(inode)->outstanding_extents++; | |
1440 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1441 | } |
1442 | ||
1443 | /* | |
1444 | * extent_io.c merge_extent_hook, used to track merged delayed allocation | |
1445 | * extents so we can keep track of new extents that are just merged onto old | |
1446 | * extents, such as when we are doing sequential writes, so we can properly | |
1447 | * account for the metadata space we'll need. | |
1448 | */ | |
1bf85046 JM |
1449 | static void btrfs_merge_extent_hook(struct inode *inode, |
1450 | struct extent_state *new, | |
1451 | struct extent_state *other) | |
9ed74f2d | 1452 | { |
9ed74f2d JB |
1453 | /* not delalloc, ignore it */ |
1454 | if (!(other->state & EXTENT_DELALLOC)) | |
1bf85046 | 1455 | return; |
9ed74f2d | 1456 | |
9e0baf60 JB |
1457 | spin_lock(&BTRFS_I(inode)->lock); |
1458 | BTRFS_I(inode)->outstanding_extents--; | |
1459 | spin_unlock(&BTRFS_I(inode)->lock); | |
9ed74f2d JB |
1460 | } |
1461 | ||
d352ac68 CM |
1462 | /* |
1463 | * extent_io.c set_bit_hook, used to track delayed allocation | |
1464 | * bytes in this file, and to maintain the list of inodes that | |
1465 | * have pending delalloc work to be done. | |
1466 | */ | |
1bf85046 JM |
1467 | static void btrfs_set_bit_hook(struct inode *inode, |
1468 | struct extent_state *state, int *bits) | |
291d673e | 1469 | { |
9ed74f2d | 1470 | |
75eff68e CM |
1471 | /* |
1472 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1473 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1474 | * bit, which is only set or cleared with irqs on |
1475 | */ | |
0ca1f7ce | 1476 | if (!(state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1477 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1478 | u64 len = state->end + 1 - state->start; |
83eea1f1 | 1479 | bool do_list = !btrfs_is_free_space_inode(inode); |
9ed74f2d | 1480 | |
9e0baf60 | 1481 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1482 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1483 | } else { |
1484 | spin_lock(&BTRFS_I(inode)->lock); | |
1485 | BTRFS_I(inode)->outstanding_extents++; | |
1486 | spin_unlock(&BTRFS_I(inode)->lock); | |
1487 | } | |
287a0ab9 | 1488 | |
75eff68e | 1489 | spin_lock(&root->fs_info->delalloc_lock); |
0ca1f7ce YZ |
1490 | BTRFS_I(inode)->delalloc_bytes += len; |
1491 | root->fs_info->delalloc_bytes += len; | |
0cb59c99 | 1492 | if (do_list && list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
ea8c2819 CM |
1493 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, |
1494 | &root->fs_info->delalloc_inodes); | |
1495 | } | |
75eff68e | 1496 | spin_unlock(&root->fs_info->delalloc_lock); |
291d673e | 1497 | } |
291d673e CM |
1498 | } |
1499 | ||
d352ac68 CM |
1500 | /* |
1501 | * extent_io.c clear_bit_hook, see set_bit_hook for why | |
1502 | */ | |
1bf85046 JM |
1503 | static void btrfs_clear_bit_hook(struct inode *inode, |
1504 | struct extent_state *state, int *bits) | |
291d673e | 1505 | { |
75eff68e CM |
1506 | /* |
1507 | * set_bit and clear bit hooks normally require _irqsave/restore | |
27160b6b | 1508 | * but in this case, we are only testing for the DELALLOC |
75eff68e CM |
1509 | * bit, which is only set or cleared with irqs on |
1510 | */ | |
0ca1f7ce | 1511 | if ((state->state & EXTENT_DELALLOC) && (*bits & EXTENT_DELALLOC)) { |
291d673e | 1512 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1513 | u64 len = state->end + 1 - state->start; |
83eea1f1 | 1514 | bool do_list = !btrfs_is_free_space_inode(inode); |
bcbfce8a | 1515 | |
9e0baf60 | 1516 | if (*bits & EXTENT_FIRST_DELALLOC) { |
0ca1f7ce | 1517 | *bits &= ~EXTENT_FIRST_DELALLOC; |
9e0baf60 JB |
1518 | } else if (!(*bits & EXTENT_DO_ACCOUNTING)) { |
1519 | spin_lock(&BTRFS_I(inode)->lock); | |
1520 | BTRFS_I(inode)->outstanding_extents--; | |
1521 | spin_unlock(&BTRFS_I(inode)->lock); | |
1522 | } | |
0ca1f7ce YZ |
1523 | |
1524 | if (*bits & EXTENT_DO_ACCOUNTING) | |
1525 | btrfs_delalloc_release_metadata(inode, len); | |
1526 | ||
0cb59c99 JB |
1527 | if (root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID |
1528 | && do_list) | |
0ca1f7ce | 1529 | btrfs_free_reserved_data_space(inode, len); |
9ed74f2d | 1530 | |
75eff68e | 1531 | spin_lock(&root->fs_info->delalloc_lock); |
0ca1f7ce YZ |
1532 | root->fs_info->delalloc_bytes -= len; |
1533 | BTRFS_I(inode)->delalloc_bytes -= len; | |
1534 | ||
0cb59c99 | 1535 | if (do_list && BTRFS_I(inode)->delalloc_bytes == 0 && |
ea8c2819 CM |
1536 | !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
1537 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); | |
1538 | } | |
75eff68e | 1539 | spin_unlock(&root->fs_info->delalloc_lock); |
291d673e | 1540 | } |
291d673e CM |
1541 | } |
1542 | ||
d352ac68 CM |
1543 | /* |
1544 | * extent_io.c merge_bio_hook, this must check the chunk tree to make sure | |
1545 | * we don't create bios that span stripes or chunks | |
1546 | */ | |
239b14b3 | 1547 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
c8b97818 CM |
1548 | size_t size, struct bio *bio, |
1549 | unsigned long bio_flags) | |
239b14b3 CM |
1550 | { |
1551 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
a62b9401 | 1552 | u64 logical = (u64)bio->bi_sector << 9; |
239b14b3 CM |
1553 | u64 length = 0; |
1554 | u64 map_length; | |
239b14b3 CM |
1555 | int ret; |
1556 | ||
771ed689 CM |
1557 | if (bio_flags & EXTENT_BIO_COMPRESSED) |
1558 | return 0; | |
1559 | ||
f2d8d74d | 1560 | length = bio->bi_size; |
239b14b3 | 1561 | map_length = length; |
3ec706c8 | 1562 | ret = btrfs_map_block(root->fs_info, READ, logical, |
f188591e | 1563 | &map_length, NULL, 0); |
3ec706c8 | 1564 | /* Will always return 0 with map_multi == NULL */ |
3444a972 | 1565 | BUG_ON(ret < 0); |
d397712b | 1566 | if (map_length < length + size) |
239b14b3 | 1567 | return 1; |
3444a972 | 1568 | return 0; |
239b14b3 CM |
1569 | } |
1570 | ||
d352ac68 CM |
1571 | /* |
1572 | * in order to insert checksums into the metadata in large chunks, | |
1573 | * we wait until bio submission time. All the pages in the bio are | |
1574 | * checksummed and sums are attached onto the ordered extent record. | |
1575 | * | |
1576 | * At IO completion time the cums attached on the ordered extent record | |
1577 | * are inserted into the btree | |
1578 | */ | |
d397712b CM |
1579 | static int __btrfs_submit_bio_start(struct inode *inode, int rw, |
1580 | struct bio *bio, int mirror_num, | |
eaf25d93 CM |
1581 | unsigned long bio_flags, |
1582 | u64 bio_offset) | |
065631f6 | 1583 | { |
065631f6 | 1584 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 1585 | int ret = 0; |
e015640f | 1586 | |
d20f7043 | 1587 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); |
79787eaa | 1588 | BUG_ON(ret); /* -ENOMEM */ |
4a69a410 CM |
1589 | return 0; |
1590 | } | |
e015640f | 1591 | |
4a69a410 CM |
1592 | /* |
1593 | * in order to insert checksums into the metadata in large chunks, | |
1594 | * we wait until bio submission time. All the pages in the bio are | |
1595 | * checksummed and sums are attached onto the ordered extent record. | |
1596 | * | |
1597 | * At IO completion time the cums attached on the ordered extent record | |
1598 | * are inserted into the btree | |
1599 | */ | |
b2950863 | 1600 | static int __btrfs_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1601 | int mirror_num, unsigned long bio_flags, |
1602 | u64 bio_offset) | |
4a69a410 CM |
1603 | { |
1604 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
61891923 SB |
1605 | int ret; |
1606 | ||
1607 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 1); | |
1608 | if (ret) | |
1609 | bio_endio(bio, ret); | |
1610 | return ret; | |
44b8bd7e CM |
1611 | } |
1612 | ||
d352ac68 | 1613 | /* |
cad321ad CM |
1614 | * extent_io.c submission hook. This does the right thing for csum calculation |
1615 | * on write, or reading the csums from the tree before a read | |
d352ac68 | 1616 | */ |
b2950863 | 1617 | static int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
1618 | int mirror_num, unsigned long bio_flags, |
1619 | u64 bio_offset) | |
44b8bd7e CM |
1620 | { |
1621 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1622 | int ret = 0; | |
19b9bdb0 | 1623 | int skip_sum; |
0417341e | 1624 | int metadata = 0; |
b812ce28 | 1625 | int async = !atomic_read(&BTRFS_I(inode)->sync_writers); |
44b8bd7e | 1626 | |
6cbff00f | 1627 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
cad321ad | 1628 | |
83eea1f1 | 1629 | if (btrfs_is_free_space_inode(inode)) |
0417341e JM |
1630 | metadata = 2; |
1631 | ||
7b6d91da | 1632 | if (!(rw & REQ_WRITE)) { |
5fd02043 JB |
1633 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, metadata); |
1634 | if (ret) | |
61891923 | 1635 | goto out; |
5fd02043 | 1636 | |
d20f7043 | 1637 | if (bio_flags & EXTENT_BIO_COMPRESSED) { |
61891923 SB |
1638 | ret = btrfs_submit_compressed_read(inode, bio, |
1639 | mirror_num, | |
1640 | bio_flags); | |
1641 | goto out; | |
c2db1073 TI |
1642 | } else if (!skip_sum) { |
1643 | ret = btrfs_lookup_bio_sums(root, inode, bio, NULL); | |
1644 | if (ret) | |
61891923 | 1645 | goto out; |
c2db1073 | 1646 | } |
4d1b5fb4 | 1647 | goto mapit; |
b812ce28 | 1648 | } else if (async && !skip_sum) { |
17d217fe YZ |
1649 | /* csum items have already been cloned */ |
1650 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID) | |
1651 | goto mapit; | |
19b9bdb0 | 1652 | /* we're doing a write, do the async checksumming */ |
61891923 | 1653 | ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
44b8bd7e | 1654 | inode, rw, bio, mirror_num, |
eaf25d93 CM |
1655 | bio_flags, bio_offset, |
1656 | __btrfs_submit_bio_start, | |
4a69a410 | 1657 | __btrfs_submit_bio_done); |
61891923 | 1658 | goto out; |
b812ce28 JB |
1659 | } else if (!skip_sum) { |
1660 | ret = btrfs_csum_one_bio(root, inode, bio, 0, 0); | |
1661 | if (ret) | |
1662 | goto out; | |
19b9bdb0 CM |
1663 | } |
1664 | ||
0b86a832 | 1665 | mapit: |
61891923 SB |
1666 | ret = btrfs_map_bio(root, rw, bio, mirror_num, 0); |
1667 | ||
1668 | out: | |
1669 | if (ret < 0) | |
1670 | bio_endio(bio, ret); | |
1671 | return ret; | |
065631f6 | 1672 | } |
6885f308 | 1673 | |
d352ac68 CM |
1674 | /* |
1675 | * given a list of ordered sums record them in the inode. This happens | |
1676 | * at IO completion time based on sums calculated at bio submission time. | |
1677 | */ | |
ba1da2f4 | 1678 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
1679 | struct inode *inode, u64 file_offset, |
1680 | struct list_head *list) | |
1681 | { | |
e6dcd2dc CM |
1682 | struct btrfs_ordered_sum *sum; |
1683 | ||
c6e30871 | 1684 | list_for_each_entry(sum, list, list) { |
d20f7043 CM |
1685 | btrfs_csum_file_blocks(trans, |
1686 | BTRFS_I(inode)->root->fs_info->csum_root, sum); | |
e6dcd2dc CM |
1687 | } |
1688 | return 0; | |
1689 | } | |
1690 | ||
2ac55d41 JB |
1691 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end, |
1692 | struct extent_state **cached_state) | |
ea8c2819 | 1693 | { |
6c1500f2 | 1694 | WARN_ON((end & (PAGE_CACHE_SIZE - 1)) == 0); |
ea8c2819 | 1695 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, |
2ac55d41 | 1696 | cached_state, GFP_NOFS); |
ea8c2819 CM |
1697 | } |
1698 | ||
d352ac68 | 1699 | /* see btrfs_writepage_start_hook for details on why this is required */ |
247e743c CM |
1700 | struct btrfs_writepage_fixup { |
1701 | struct page *page; | |
1702 | struct btrfs_work work; | |
1703 | }; | |
1704 | ||
b2950863 | 1705 | static void btrfs_writepage_fixup_worker(struct btrfs_work *work) |
247e743c CM |
1706 | { |
1707 | struct btrfs_writepage_fixup *fixup; | |
1708 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 1709 | struct extent_state *cached_state = NULL; |
247e743c CM |
1710 | struct page *page; |
1711 | struct inode *inode; | |
1712 | u64 page_start; | |
1713 | u64 page_end; | |
87826df0 | 1714 | int ret; |
247e743c CM |
1715 | |
1716 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
1717 | page = fixup->page; | |
4a096752 | 1718 | again: |
247e743c CM |
1719 | lock_page(page); |
1720 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
1721 | ClearPageChecked(page); | |
1722 | goto out_page; | |
1723 | } | |
1724 | ||
1725 | inode = page->mapping->host; | |
1726 | page_start = page_offset(page); | |
1727 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
1728 | ||
2ac55d41 | 1729 | lock_extent_bits(&BTRFS_I(inode)->io_tree, page_start, page_end, 0, |
d0082371 | 1730 | &cached_state); |
4a096752 CM |
1731 | |
1732 | /* already ordered? We're done */ | |
8b62b72b | 1733 | if (PagePrivate2(page)) |
247e743c | 1734 | goto out; |
4a096752 CM |
1735 | |
1736 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
1737 | if (ordered) { | |
2ac55d41 JB |
1738 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, |
1739 | page_end, &cached_state, GFP_NOFS); | |
4a096752 CM |
1740 | unlock_page(page); |
1741 | btrfs_start_ordered_extent(inode, ordered, 1); | |
87826df0 | 1742 | btrfs_put_ordered_extent(ordered); |
4a096752 CM |
1743 | goto again; |
1744 | } | |
247e743c | 1745 | |
87826df0 JM |
1746 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
1747 | if (ret) { | |
1748 | mapping_set_error(page->mapping, ret); | |
1749 | end_extent_writepage(page, ret, page_start, page_end); | |
1750 | ClearPageChecked(page); | |
1751 | goto out; | |
1752 | } | |
1753 | ||
2ac55d41 | 1754 | btrfs_set_extent_delalloc(inode, page_start, page_end, &cached_state); |
247e743c | 1755 | ClearPageChecked(page); |
87826df0 | 1756 | set_page_dirty(page); |
247e743c | 1757 | out: |
2ac55d41 JB |
1758 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start, page_end, |
1759 | &cached_state, GFP_NOFS); | |
247e743c CM |
1760 | out_page: |
1761 | unlock_page(page); | |
1762 | page_cache_release(page); | |
b897abec | 1763 | kfree(fixup); |
247e743c CM |
1764 | } |
1765 | ||
1766 | /* | |
1767 | * There are a few paths in the higher layers of the kernel that directly | |
1768 | * set the page dirty bit without asking the filesystem if it is a | |
1769 | * good idea. This causes problems because we want to make sure COW | |
1770 | * properly happens and the data=ordered rules are followed. | |
1771 | * | |
c8b97818 | 1772 | * In our case any range that doesn't have the ORDERED bit set |
247e743c CM |
1773 | * hasn't been properly setup for IO. We kick off an async process |
1774 | * to fix it up. The async helper will wait for ordered extents, set | |
1775 | * the delalloc bit and make it safe to write the page. | |
1776 | */ | |
b2950863 | 1777 | static int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) |
247e743c CM |
1778 | { |
1779 | struct inode *inode = page->mapping->host; | |
1780 | struct btrfs_writepage_fixup *fixup; | |
1781 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
247e743c | 1782 | |
8b62b72b CM |
1783 | /* this page is properly in the ordered list */ |
1784 | if (TestClearPagePrivate2(page)) | |
247e743c CM |
1785 | return 0; |
1786 | ||
1787 | if (PageChecked(page)) | |
1788 | return -EAGAIN; | |
1789 | ||
1790 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
1791 | if (!fixup) | |
1792 | return -EAGAIN; | |
f421950f | 1793 | |
247e743c CM |
1794 | SetPageChecked(page); |
1795 | page_cache_get(page); | |
1796 | fixup->work.func = btrfs_writepage_fixup_worker; | |
1797 | fixup->page = page; | |
1798 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); | |
87826df0 | 1799 | return -EBUSY; |
247e743c CM |
1800 | } |
1801 | ||
d899e052 YZ |
1802 | static int insert_reserved_file_extent(struct btrfs_trans_handle *trans, |
1803 | struct inode *inode, u64 file_pos, | |
1804 | u64 disk_bytenr, u64 disk_num_bytes, | |
1805 | u64 num_bytes, u64 ram_bytes, | |
1806 | u8 compression, u8 encryption, | |
1807 | u16 other_encoding, int extent_type) | |
1808 | { | |
1809 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1810 | struct btrfs_file_extent_item *fi; | |
1811 | struct btrfs_path *path; | |
1812 | struct extent_buffer *leaf; | |
1813 | struct btrfs_key ins; | |
d899e052 YZ |
1814 | int ret; |
1815 | ||
1816 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
1817 | if (!path) |
1818 | return -ENOMEM; | |
d899e052 | 1819 | |
b9473439 | 1820 | path->leave_spinning = 1; |
a1ed835e CM |
1821 | |
1822 | /* | |
1823 | * we may be replacing one extent in the tree with another. | |
1824 | * The new extent is pinned in the extent map, and we don't want | |
1825 | * to drop it from the cache until it is completely in the btree. | |
1826 | * | |
1827 | * So, tell btrfs_drop_extents to leave this extent in the cache. | |
1828 | * the caller is expected to unpin it and allow it to be merged | |
1829 | * with the others. | |
1830 | */ | |
5dc562c5 | 1831 | ret = btrfs_drop_extents(trans, root, inode, file_pos, |
2671485d | 1832 | file_pos + num_bytes, 0); |
79787eaa JM |
1833 | if (ret) |
1834 | goto out; | |
d899e052 | 1835 | |
33345d01 | 1836 | ins.objectid = btrfs_ino(inode); |
d899e052 YZ |
1837 | ins.offset = file_pos; |
1838 | ins.type = BTRFS_EXTENT_DATA_KEY; | |
1839 | ret = btrfs_insert_empty_item(trans, root, path, &ins, sizeof(*fi)); | |
79787eaa JM |
1840 | if (ret) |
1841 | goto out; | |
d899e052 YZ |
1842 | leaf = path->nodes[0]; |
1843 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
1844 | struct btrfs_file_extent_item); | |
1845 | btrfs_set_file_extent_generation(leaf, fi, trans->transid); | |
1846 | btrfs_set_file_extent_type(leaf, fi, extent_type); | |
1847 | btrfs_set_file_extent_disk_bytenr(leaf, fi, disk_bytenr); | |
1848 | btrfs_set_file_extent_disk_num_bytes(leaf, fi, disk_num_bytes); | |
1849 | btrfs_set_file_extent_offset(leaf, fi, 0); | |
1850 | btrfs_set_file_extent_num_bytes(leaf, fi, num_bytes); | |
1851 | btrfs_set_file_extent_ram_bytes(leaf, fi, ram_bytes); | |
1852 | btrfs_set_file_extent_compression(leaf, fi, compression); | |
1853 | btrfs_set_file_extent_encryption(leaf, fi, encryption); | |
1854 | btrfs_set_file_extent_other_encoding(leaf, fi, other_encoding); | |
b9473439 | 1855 | |
d899e052 | 1856 | btrfs_mark_buffer_dirty(leaf); |
ce195332 | 1857 | btrfs_release_path(path); |
d899e052 YZ |
1858 | |
1859 | inode_add_bytes(inode, num_bytes); | |
d899e052 YZ |
1860 | |
1861 | ins.objectid = disk_bytenr; | |
1862 | ins.offset = disk_num_bytes; | |
1863 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 YZ |
1864 | ret = btrfs_alloc_reserved_file_extent(trans, root, |
1865 | root->root_key.objectid, | |
33345d01 | 1866 | btrfs_ino(inode), file_pos, &ins); |
79787eaa | 1867 | out: |
d899e052 | 1868 | btrfs_free_path(path); |
b9473439 | 1869 | |
79787eaa | 1870 | return ret; |
d899e052 YZ |
1871 | } |
1872 | ||
5d13a98f CM |
1873 | /* |
1874 | * helper function for btrfs_finish_ordered_io, this | |
1875 | * just reads in some of the csum leaves to prime them into ram | |
1876 | * before we start the transaction. It limits the amount of btree | |
1877 | * reads required while inside the transaction. | |
1878 | */ | |
d352ac68 CM |
1879 | /* as ordered data IO finishes, this gets called so we can finish |
1880 | * an ordered extent if the range of bytes in the file it covers are | |
1881 | * fully written. | |
1882 | */ | |
5fd02043 | 1883 | static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent) |
e6dcd2dc | 1884 | { |
5fd02043 | 1885 | struct inode *inode = ordered_extent->inode; |
e6dcd2dc | 1886 | struct btrfs_root *root = BTRFS_I(inode)->root; |
0ca1f7ce | 1887 | struct btrfs_trans_handle *trans = NULL; |
e6dcd2dc | 1888 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2ac55d41 | 1889 | struct extent_state *cached_state = NULL; |
261507a0 | 1890 | int compress_type = 0; |
e6dcd2dc | 1891 | int ret; |
82d5902d | 1892 | bool nolock; |
e6dcd2dc | 1893 | |
83eea1f1 | 1894 | nolock = btrfs_is_free_space_inode(inode); |
0cb59c99 | 1895 | |
5fd02043 JB |
1896 | if (test_bit(BTRFS_ORDERED_IOERR, &ordered_extent->flags)) { |
1897 | ret = -EIO; | |
1898 | goto out; | |
1899 | } | |
1900 | ||
c2167754 | 1901 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) { |
79787eaa | 1902 | BUG_ON(!list_empty(&ordered_extent->list)); /* Logic error */ |
c2167754 YZ |
1903 | ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
1904 | if (!ret) { | |
0cb59c99 | 1905 | if (nolock) |
7a7eaa40 | 1906 | trans = btrfs_join_transaction_nolock(root); |
0cb59c99 | 1907 | else |
7a7eaa40 | 1908 | trans = btrfs_join_transaction(root); |
d280e5be LB |
1909 | if (IS_ERR(trans)) { |
1910 | ret = PTR_ERR(trans); | |
1911 | trans = NULL; | |
1912 | goto out; | |
1913 | } | |
0ca1f7ce | 1914 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
2115133f | 1915 | ret = btrfs_update_inode_fallback(trans, root, inode); |
79787eaa JM |
1916 | if (ret) /* -ENOMEM or corruption */ |
1917 | btrfs_abort_transaction(trans, root, ret); | |
c2167754 YZ |
1918 | } |
1919 | goto out; | |
1920 | } | |
e6dcd2dc | 1921 | |
2ac55d41 JB |
1922 | lock_extent_bits(io_tree, ordered_extent->file_offset, |
1923 | ordered_extent->file_offset + ordered_extent->len - 1, | |
d0082371 | 1924 | 0, &cached_state); |
e6dcd2dc | 1925 | |
0cb59c99 | 1926 | if (nolock) |
7a7eaa40 | 1927 | trans = btrfs_join_transaction_nolock(root); |
0cb59c99 | 1928 | else |
7a7eaa40 | 1929 | trans = btrfs_join_transaction(root); |
79787eaa JM |
1930 | if (IS_ERR(trans)) { |
1931 | ret = PTR_ERR(trans); | |
1932 | trans = NULL; | |
1933 | goto out_unlock; | |
1934 | } | |
0ca1f7ce | 1935 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; |
c2167754 | 1936 | |
c8b97818 | 1937 | if (test_bit(BTRFS_ORDERED_COMPRESSED, &ordered_extent->flags)) |
261507a0 | 1938 | compress_type = ordered_extent->compress_type; |
d899e052 | 1939 | if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
261507a0 | 1940 | BUG_ON(compress_type); |
920bbbfb | 1941 | ret = btrfs_mark_extent_written(trans, inode, |
d899e052 YZ |
1942 | ordered_extent->file_offset, |
1943 | ordered_extent->file_offset + | |
1944 | ordered_extent->len); | |
d899e052 | 1945 | } else { |
0af3d00b | 1946 | BUG_ON(root == root->fs_info->tree_root); |
d899e052 YZ |
1947 | ret = insert_reserved_file_extent(trans, inode, |
1948 | ordered_extent->file_offset, | |
1949 | ordered_extent->start, | |
1950 | ordered_extent->disk_len, | |
1951 | ordered_extent->len, | |
1952 | ordered_extent->len, | |
261507a0 | 1953 | compress_type, 0, 0, |
d899e052 | 1954 | BTRFS_FILE_EXTENT_REG); |
d899e052 | 1955 | } |
5dc562c5 JB |
1956 | unpin_extent_cache(&BTRFS_I(inode)->extent_tree, |
1957 | ordered_extent->file_offset, ordered_extent->len, | |
1958 | trans->transid); | |
79787eaa JM |
1959 | if (ret < 0) { |
1960 | btrfs_abort_transaction(trans, root, ret); | |
5fd02043 | 1961 | goto out_unlock; |
79787eaa | 1962 | } |
2ac55d41 | 1963 | |
e6dcd2dc CM |
1964 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
1965 | &ordered_extent->list); | |
1966 | ||
1ef30be1 | 1967 | ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent); |
a39f7521 | 1968 | if (!ret || !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) { |
2115133f | 1969 | ret = btrfs_update_inode_fallback(trans, root, inode); |
79787eaa JM |
1970 | if (ret) { /* -ENOMEM or corruption */ |
1971 | btrfs_abort_transaction(trans, root, ret); | |
5fd02043 | 1972 | goto out_unlock; |
79787eaa | 1973 | } |
7c735313 JB |
1974 | } else { |
1975 | btrfs_set_inode_last_trans(trans, inode); | |
1ef30be1 JB |
1976 | } |
1977 | ret = 0; | |
5fd02043 JB |
1978 | out_unlock: |
1979 | unlock_extent_cached(io_tree, ordered_extent->file_offset, | |
1980 | ordered_extent->file_offset + | |
1981 | ordered_extent->len - 1, &cached_state, GFP_NOFS); | |
c2167754 | 1982 | out: |
5b0e95bf | 1983 | if (root != root->fs_info->tree_root) |
0cb59c99 | 1984 | btrfs_delalloc_release_metadata(inode, ordered_extent->len); |
a698d075 MX |
1985 | if (trans) |
1986 | btrfs_end_transaction(trans, root); | |
0cb59c99 | 1987 | |
5fd02043 JB |
1988 | if (ret) |
1989 | clear_extent_uptodate(io_tree, ordered_extent->file_offset, | |
1990 | ordered_extent->file_offset + | |
1991 | ordered_extent->len - 1, NULL, GFP_NOFS); | |
1992 | ||
1993 | /* | |
8bad3c02 LB |
1994 | * This needs to be done to make sure anybody waiting knows we are done |
1995 | * updating everything for this ordered extent. | |
5fd02043 JB |
1996 | */ |
1997 | btrfs_remove_ordered_extent(inode, ordered_extent); | |
1998 | ||
e6dcd2dc CM |
1999 | /* once for us */ |
2000 | btrfs_put_ordered_extent(ordered_extent); | |
2001 | /* once for the tree */ | |
2002 | btrfs_put_ordered_extent(ordered_extent); | |
2003 | ||
5fd02043 JB |
2004 | return ret; |
2005 | } | |
2006 | ||
2007 | static void finish_ordered_fn(struct btrfs_work *work) | |
2008 | { | |
2009 | struct btrfs_ordered_extent *ordered_extent; | |
2010 | ordered_extent = container_of(work, struct btrfs_ordered_extent, work); | |
2011 | btrfs_finish_ordered_io(ordered_extent); | |
e6dcd2dc CM |
2012 | } |
2013 | ||
b2950863 | 2014 | static int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
211f90e6 CM |
2015 | struct extent_state *state, int uptodate) |
2016 | { | |
5fd02043 JB |
2017 | struct inode *inode = page->mapping->host; |
2018 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2019 | struct btrfs_ordered_extent *ordered_extent = NULL; | |
2020 | struct btrfs_workers *workers; | |
2021 | ||
1abe9b8a | 2022 | trace_btrfs_writepage_end_io_hook(page, start, end, uptodate); |
2023 | ||
8b62b72b | 2024 | ClearPagePrivate2(page); |
5fd02043 JB |
2025 | if (!btrfs_dec_test_ordered_pending(inode, &ordered_extent, start, |
2026 | end - start + 1, uptodate)) | |
2027 | return 0; | |
2028 | ||
2029 | ordered_extent->work.func = finish_ordered_fn; | |
2030 | ordered_extent->work.flags = 0; | |
2031 | ||
83eea1f1 | 2032 | if (btrfs_is_free_space_inode(inode)) |
5fd02043 JB |
2033 | workers = &root->fs_info->endio_freespace_worker; |
2034 | else | |
2035 | workers = &root->fs_info->endio_write_workers; | |
2036 | btrfs_queue_worker(workers, &ordered_extent->work); | |
2037 | ||
2038 | return 0; | |
211f90e6 CM |
2039 | } |
2040 | ||
d352ac68 CM |
2041 | /* |
2042 | * when reads are done, we need to check csums to verify the data is correct | |
4a54c8c1 JS |
2043 | * if there's a match, we allow the bio to finish. If not, the code in |
2044 | * extent_io.c will try to find good copies for us. | |
d352ac68 | 2045 | */ |
b2950863 | 2046 | static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
5cf1ab56 | 2047 | struct extent_state *state, int mirror) |
07157aac | 2048 | { |
35ebb934 | 2049 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 2050 | struct inode *inode = page->mapping->host; |
d1310b2e | 2051 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 2052 | char *kaddr; |
aadfeb6e | 2053 | u64 private = ~(u32)0; |
07157aac | 2054 | int ret; |
ff79f819 CM |
2055 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2056 | u32 csum = ~(u32)0; | |
d1310b2e | 2057 | |
d20f7043 CM |
2058 | if (PageChecked(page)) { |
2059 | ClearPageChecked(page); | |
2060 | goto good; | |
2061 | } | |
6cbff00f CH |
2062 | |
2063 | if (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM) | |
08d2f347 | 2064 | goto good; |
17d217fe YZ |
2065 | |
2066 | if (root->root_key.objectid == BTRFS_DATA_RELOC_TREE_OBJECTID && | |
9655d298 | 2067 | test_range_bit(io_tree, start, end, EXTENT_NODATASUM, 1, NULL)) { |
17d217fe YZ |
2068 | clear_extent_bits(io_tree, start, end, EXTENT_NODATASUM, |
2069 | GFP_NOFS); | |
b6cda9bc | 2070 | return 0; |
17d217fe | 2071 | } |
d20f7043 | 2072 | |
c2e639f0 | 2073 | if (state && state->start == start) { |
70dec807 CM |
2074 | private = state->private; |
2075 | ret = 0; | |
2076 | } else { | |
2077 | ret = get_state_private(io_tree, start, &private); | |
2078 | } | |
7ac687d9 | 2079 | kaddr = kmap_atomic(page); |
d397712b | 2080 | if (ret) |
07157aac | 2081 | goto zeroit; |
d397712b | 2082 | |
ff79f819 CM |
2083 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
2084 | btrfs_csum_final(csum, (char *)&csum); | |
d397712b | 2085 | if (csum != private) |
07157aac | 2086 | goto zeroit; |
d397712b | 2087 | |
7ac687d9 | 2088 | kunmap_atomic(kaddr); |
d20f7043 | 2089 | good: |
07157aac CM |
2090 | return 0; |
2091 | ||
2092 | zeroit: | |
945d8962 | 2093 | printk_ratelimited(KERN_INFO "btrfs csum failed ino %llu off %llu csum %u " |
33345d01 LZ |
2094 | "private %llu\n", |
2095 | (unsigned long long)btrfs_ino(page->mapping->host), | |
193f284d CM |
2096 | (unsigned long long)start, csum, |
2097 | (unsigned long long)private); | |
db94535d CM |
2098 | memset(kaddr + offset, 1, end - start + 1); |
2099 | flush_dcache_page(page); | |
7ac687d9 | 2100 | kunmap_atomic(kaddr); |
3b951516 CM |
2101 | if (private == 0) |
2102 | return 0; | |
7e38326f | 2103 | return -EIO; |
07157aac | 2104 | } |
b888db2b | 2105 | |
24bbcf04 YZ |
2106 | struct delayed_iput { |
2107 | struct list_head list; | |
2108 | struct inode *inode; | |
2109 | }; | |
2110 | ||
79787eaa JM |
2111 | /* JDM: If this is fs-wide, why can't we add a pointer to |
2112 | * btrfs_inode instead and avoid the allocation? */ | |
24bbcf04 YZ |
2113 | void btrfs_add_delayed_iput(struct inode *inode) |
2114 | { | |
2115 | struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; | |
2116 | struct delayed_iput *delayed; | |
2117 | ||
2118 | if (atomic_add_unless(&inode->i_count, -1, 1)) | |
2119 | return; | |
2120 | ||
2121 | delayed = kmalloc(sizeof(*delayed), GFP_NOFS | __GFP_NOFAIL); | |
2122 | delayed->inode = inode; | |
2123 | ||
2124 | spin_lock(&fs_info->delayed_iput_lock); | |
2125 | list_add_tail(&delayed->list, &fs_info->delayed_iputs); | |
2126 | spin_unlock(&fs_info->delayed_iput_lock); | |
2127 | } | |
2128 | ||
2129 | void btrfs_run_delayed_iputs(struct btrfs_root *root) | |
2130 | { | |
2131 | LIST_HEAD(list); | |
2132 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2133 | struct delayed_iput *delayed; | |
2134 | int empty; | |
2135 | ||
2136 | spin_lock(&fs_info->delayed_iput_lock); | |
2137 | empty = list_empty(&fs_info->delayed_iputs); | |
2138 | spin_unlock(&fs_info->delayed_iput_lock); | |
2139 | if (empty) | |
2140 | return; | |
2141 | ||
24bbcf04 YZ |
2142 | spin_lock(&fs_info->delayed_iput_lock); |
2143 | list_splice_init(&fs_info->delayed_iputs, &list); | |
2144 | spin_unlock(&fs_info->delayed_iput_lock); | |
2145 | ||
2146 | while (!list_empty(&list)) { | |
2147 | delayed = list_entry(list.next, struct delayed_iput, list); | |
2148 | list_del(&delayed->list); | |
2149 | iput(delayed->inode); | |
2150 | kfree(delayed); | |
2151 | } | |
24bbcf04 YZ |
2152 | } |
2153 | ||
d68fc57b YZ |
2154 | enum btrfs_orphan_cleanup_state { |
2155 | ORPHAN_CLEANUP_STARTED = 1, | |
2156 | ORPHAN_CLEANUP_DONE = 2, | |
2157 | }; | |
2158 | ||
2159 | /* | |
42b2aa86 | 2160 | * This is called in transaction commit time. If there are no orphan |
d68fc57b YZ |
2161 | * files in the subvolume, it removes orphan item and frees block_rsv |
2162 | * structure. | |
2163 | */ | |
2164 | void btrfs_orphan_commit_root(struct btrfs_trans_handle *trans, | |
2165 | struct btrfs_root *root) | |
2166 | { | |
90290e19 | 2167 | struct btrfs_block_rsv *block_rsv; |
d68fc57b YZ |
2168 | int ret; |
2169 | ||
8a35d95f | 2170 | if (atomic_read(&root->orphan_inodes) || |
d68fc57b YZ |
2171 | root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) |
2172 | return; | |
2173 | ||
90290e19 | 2174 | spin_lock(&root->orphan_lock); |
8a35d95f | 2175 | if (atomic_read(&root->orphan_inodes)) { |
90290e19 JB |
2176 | spin_unlock(&root->orphan_lock); |
2177 | return; | |
2178 | } | |
2179 | ||
2180 | if (root->orphan_cleanup_state != ORPHAN_CLEANUP_DONE) { | |
2181 | spin_unlock(&root->orphan_lock); | |
2182 | return; | |
2183 | } | |
2184 | ||
2185 | block_rsv = root->orphan_block_rsv; | |
2186 | root->orphan_block_rsv = NULL; | |
2187 | spin_unlock(&root->orphan_lock); | |
2188 | ||
d68fc57b YZ |
2189 | if (root->orphan_item_inserted && |
2190 | btrfs_root_refs(&root->root_item) > 0) { | |
2191 | ret = btrfs_del_orphan_item(trans, root->fs_info->tree_root, | |
2192 | root->root_key.objectid); | |
2193 | BUG_ON(ret); | |
2194 | root->orphan_item_inserted = 0; | |
2195 | } | |
2196 | ||
90290e19 JB |
2197 | if (block_rsv) { |
2198 | WARN_ON(block_rsv->size > 0); | |
2199 | btrfs_free_block_rsv(root, block_rsv); | |
d68fc57b YZ |
2200 | } |
2201 | } | |
2202 | ||
7b128766 JB |
2203 | /* |
2204 | * This creates an orphan entry for the given inode in case something goes | |
2205 | * wrong in the middle of an unlink/truncate. | |
d68fc57b YZ |
2206 | * |
2207 | * NOTE: caller of this function should reserve 5 units of metadata for | |
2208 | * this function. | |
7b128766 JB |
2209 | */ |
2210 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
2211 | { | |
2212 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
2213 | struct btrfs_block_rsv *block_rsv = NULL; |
2214 | int reserve = 0; | |
2215 | int insert = 0; | |
2216 | int ret; | |
7b128766 | 2217 | |
d68fc57b | 2218 | if (!root->orphan_block_rsv) { |
66d8f3dd | 2219 | block_rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
b532402e TI |
2220 | if (!block_rsv) |
2221 | return -ENOMEM; | |
d68fc57b | 2222 | } |
7b128766 | 2223 | |
d68fc57b YZ |
2224 | spin_lock(&root->orphan_lock); |
2225 | if (!root->orphan_block_rsv) { | |
2226 | root->orphan_block_rsv = block_rsv; | |
2227 | } else if (block_rsv) { | |
2228 | btrfs_free_block_rsv(root, block_rsv); | |
2229 | block_rsv = NULL; | |
7b128766 | 2230 | } |
7b128766 | 2231 | |
8a35d95f JB |
2232 | if (!test_and_set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
2233 | &BTRFS_I(inode)->runtime_flags)) { | |
d68fc57b YZ |
2234 | #if 0 |
2235 | /* | |
2236 | * For proper ENOSPC handling, we should do orphan | |
2237 | * cleanup when mounting. But this introduces backward | |
2238 | * compatibility issue. | |
2239 | */ | |
2240 | if (!xchg(&root->orphan_item_inserted, 1)) | |
2241 | insert = 2; | |
2242 | else | |
2243 | insert = 1; | |
2244 | #endif | |
2245 | insert = 1; | |
321f0e70 | 2246 | atomic_inc(&root->orphan_inodes); |
7b128766 JB |
2247 | } |
2248 | ||
72ac3c0d JB |
2249 | if (!test_and_set_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
2250 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 2251 | reserve = 1; |
d68fc57b | 2252 | spin_unlock(&root->orphan_lock); |
7b128766 | 2253 | |
d68fc57b YZ |
2254 | /* grab metadata reservation from transaction handle */ |
2255 | if (reserve) { | |
2256 | ret = btrfs_orphan_reserve_metadata(trans, inode); | |
79787eaa | 2257 | BUG_ON(ret); /* -ENOSPC in reservation; Logic error? JDM */ |
d68fc57b | 2258 | } |
7b128766 | 2259 | |
d68fc57b YZ |
2260 | /* insert an orphan item to track this unlinked/truncated file */ |
2261 | if (insert >= 1) { | |
33345d01 | 2262 | ret = btrfs_insert_orphan_item(trans, root, btrfs_ino(inode)); |
79787eaa | 2263 | if (ret && ret != -EEXIST) { |
8a35d95f JB |
2264 | clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
2265 | &BTRFS_I(inode)->runtime_flags); | |
79787eaa JM |
2266 | btrfs_abort_transaction(trans, root, ret); |
2267 | return ret; | |
2268 | } | |
2269 | ret = 0; | |
d68fc57b YZ |
2270 | } |
2271 | ||
2272 | /* insert an orphan item to track subvolume contains orphan files */ | |
2273 | if (insert >= 2) { | |
2274 | ret = btrfs_insert_orphan_item(trans, root->fs_info->tree_root, | |
2275 | root->root_key.objectid); | |
79787eaa JM |
2276 | if (ret && ret != -EEXIST) { |
2277 | btrfs_abort_transaction(trans, root, ret); | |
2278 | return ret; | |
2279 | } | |
d68fc57b YZ |
2280 | } |
2281 | return 0; | |
7b128766 JB |
2282 | } |
2283 | ||
2284 | /* | |
2285 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
2286 | * item for this particular inode. | |
2287 | */ | |
2288 | int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) | |
2289 | { | |
2290 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d68fc57b YZ |
2291 | int delete_item = 0; |
2292 | int release_rsv = 0; | |
7b128766 JB |
2293 | int ret = 0; |
2294 | ||
d68fc57b | 2295 | spin_lock(&root->orphan_lock); |
8a35d95f JB |
2296 | if (test_and_clear_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
2297 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 2298 | delete_item = 1; |
7b128766 | 2299 | |
72ac3c0d JB |
2300 | if (test_and_clear_bit(BTRFS_INODE_ORPHAN_META_RESERVED, |
2301 | &BTRFS_I(inode)->runtime_flags)) | |
d68fc57b | 2302 | release_rsv = 1; |
d68fc57b | 2303 | spin_unlock(&root->orphan_lock); |
7b128766 | 2304 | |
d68fc57b | 2305 | if (trans && delete_item) { |
33345d01 | 2306 | ret = btrfs_del_orphan_item(trans, root, btrfs_ino(inode)); |
79787eaa | 2307 | BUG_ON(ret); /* -ENOMEM or corruption (JDM: Recheck) */ |
d68fc57b | 2308 | } |
7b128766 | 2309 | |
8a35d95f | 2310 | if (release_rsv) { |
d68fc57b | 2311 | btrfs_orphan_release_metadata(inode); |
8a35d95f JB |
2312 | atomic_dec(&root->orphan_inodes); |
2313 | } | |
7b128766 | 2314 | |
d68fc57b | 2315 | return 0; |
7b128766 JB |
2316 | } |
2317 | ||
2318 | /* | |
2319 | * this cleans up any orphans that may be left on the list from the last use | |
2320 | * of this root. | |
2321 | */ | |
66b4ffd1 | 2322 | int btrfs_orphan_cleanup(struct btrfs_root *root) |
7b128766 JB |
2323 | { |
2324 | struct btrfs_path *path; | |
2325 | struct extent_buffer *leaf; | |
7b128766 JB |
2326 | struct btrfs_key key, found_key; |
2327 | struct btrfs_trans_handle *trans; | |
2328 | struct inode *inode; | |
8f6d7f4f | 2329 | u64 last_objectid = 0; |
7b128766 JB |
2330 | int ret = 0, nr_unlink = 0, nr_truncate = 0; |
2331 | ||
d68fc57b | 2332 | if (cmpxchg(&root->orphan_cleanup_state, 0, ORPHAN_CLEANUP_STARTED)) |
66b4ffd1 | 2333 | return 0; |
c71bf099 YZ |
2334 | |
2335 | path = btrfs_alloc_path(); | |
66b4ffd1 JB |
2336 | if (!path) { |
2337 | ret = -ENOMEM; | |
2338 | goto out; | |
2339 | } | |
7b128766 JB |
2340 | path->reada = -1; |
2341 | ||
2342 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
2343 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); | |
2344 | key.offset = (u64)-1; | |
2345 | ||
7b128766 JB |
2346 | while (1) { |
2347 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
66b4ffd1 JB |
2348 | if (ret < 0) |
2349 | goto out; | |
7b128766 JB |
2350 | |
2351 | /* | |
2352 | * if ret == 0 means we found what we were searching for, which | |
25985edc | 2353 | * is weird, but possible, so only screw with path if we didn't |
7b128766 JB |
2354 | * find the key and see if we have stuff that matches |
2355 | */ | |
2356 | if (ret > 0) { | |
66b4ffd1 | 2357 | ret = 0; |
7b128766 JB |
2358 | if (path->slots[0] == 0) |
2359 | break; | |
2360 | path->slots[0]--; | |
2361 | } | |
2362 | ||
2363 | /* pull out the item */ | |
2364 | leaf = path->nodes[0]; | |
7b128766 JB |
2365 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2366 | ||
2367 | /* make sure the item matches what we want */ | |
2368 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
2369 | break; | |
2370 | if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY) | |
2371 | break; | |
2372 | ||
2373 | /* release the path since we're done with it */ | |
b3b4aa74 | 2374 | btrfs_release_path(path); |
7b128766 JB |
2375 | |
2376 | /* | |
2377 | * this is where we are basically btrfs_lookup, without the | |
2378 | * crossing root thing. we store the inode number in the | |
2379 | * offset of the orphan item. | |
2380 | */ | |
8f6d7f4f JB |
2381 | |
2382 | if (found_key.offset == last_objectid) { | |
2383 | printk(KERN_ERR "btrfs: Error removing orphan entry, " | |
2384 | "stopping orphan cleanup\n"); | |
2385 | ret = -EINVAL; | |
2386 | goto out; | |
2387 | } | |
2388 | ||
2389 | last_objectid = found_key.offset; | |
2390 | ||
5d4f98a2 YZ |
2391 | found_key.objectid = found_key.offset; |
2392 | found_key.type = BTRFS_INODE_ITEM_KEY; | |
2393 | found_key.offset = 0; | |
73f73415 | 2394 | inode = btrfs_iget(root->fs_info->sb, &found_key, root, NULL); |
a8c9e576 JB |
2395 | ret = PTR_RET(inode); |
2396 | if (ret && ret != -ESTALE) | |
66b4ffd1 | 2397 | goto out; |
7b128766 | 2398 | |
f8e9e0b0 AJ |
2399 | if (ret == -ESTALE && root == root->fs_info->tree_root) { |
2400 | struct btrfs_root *dead_root; | |
2401 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2402 | int is_dead_root = 0; | |
2403 | ||
2404 | /* | |
2405 | * this is an orphan in the tree root. Currently these | |
2406 | * could come from 2 sources: | |
2407 | * a) a snapshot deletion in progress | |
2408 | * b) a free space cache inode | |
2409 | * We need to distinguish those two, as the snapshot | |
2410 | * orphan must not get deleted. | |
2411 | * find_dead_roots already ran before us, so if this | |
2412 | * is a snapshot deletion, we should find the root | |
2413 | * in the dead_roots list | |
2414 | */ | |
2415 | spin_lock(&fs_info->trans_lock); | |
2416 | list_for_each_entry(dead_root, &fs_info->dead_roots, | |
2417 | root_list) { | |
2418 | if (dead_root->root_key.objectid == | |
2419 | found_key.objectid) { | |
2420 | is_dead_root = 1; | |
2421 | break; | |
2422 | } | |
2423 | } | |
2424 | spin_unlock(&fs_info->trans_lock); | |
2425 | if (is_dead_root) { | |
2426 | /* prevent this orphan from being found again */ | |
2427 | key.offset = found_key.objectid - 1; | |
2428 | continue; | |
2429 | } | |
2430 | } | |
7b128766 | 2431 | /* |
a8c9e576 JB |
2432 | * Inode is already gone but the orphan item is still there, |
2433 | * kill the orphan item. | |
7b128766 | 2434 | */ |
a8c9e576 JB |
2435 | if (ret == -ESTALE) { |
2436 | trans = btrfs_start_transaction(root, 1); | |
66b4ffd1 JB |
2437 | if (IS_ERR(trans)) { |
2438 | ret = PTR_ERR(trans); | |
2439 | goto out; | |
2440 | } | |
8a35d95f JB |
2441 | printk(KERN_ERR "auto deleting %Lu\n", |
2442 | found_key.objectid); | |
a8c9e576 JB |
2443 | ret = btrfs_del_orphan_item(trans, root, |
2444 | found_key.objectid); | |
79787eaa | 2445 | BUG_ON(ret); /* -ENOMEM or corruption (JDM: Recheck) */ |
5b21f2ed | 2446 | btrfs_end_transaction(trans, root); |
7b128766 JB |
2447 | continue; |
2448 | } | |
2449 | ||
a8c9e576 JB |
2450 | /* |
2451 | * add this inode to the orphan list so btrfs_orphan_del does | |
2452 | * the proper thing when we hit it | |
2453 | */ | |
8a35d95f JB |
2454 | set_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
2455 | &BTRFS_I(inode)->runtime_flags); | |
a8c9e576 | 2456 | |
7b128766 JB |
2457 | /* if we have links, this was a truncate, lets do that */ |
2458 | if (inode->i_nlink) { | |
a41ad394 JB |
2459 | if (!S_ISREG(inode->i_mode)) { |
2460 | WARN_ON(1); | |
2461 | iput(inode); | |
2462 | continue; | |
2463 | } | |
7b128766 | 2464 | nr_truncate++; |
66b4ffd1 | 2465 | ret = btrfs_truncate(inode); |
7b128766 JB |
2466 | } else { |
2467 | nr_unlink++; | |
2468 | } | |
2469 | ||
2470 | /* this will do delete_inode and everything for us */ | |
2471 | iput(inode); | |
66b4ffd1 JB |
2472 | if (ret) |
2473 | goto out; | |
7b128766 | 2474 | } |
3254c876 MX |
2475 | /* release the path since we're done with it */ |
2476 | btrfs_release_path(path); | |
2477 | ||
d68fc57b YZ |
2478 | root->orphan_cleanup_state = ORPHAN_CLEANUP_DONE; |
2479 | ||
2480 | if (root->orphan_block_rsv) | |
2481 | btrfs_block_rsv_release(root, root->orphan_block_rsv, | |
2482 | (u64)-1); | |
2483 | ||
2484 | if (root->orphan_block_rsv || root->orphan_item_inserted) { | |
7a7eaa40 | 2485 | trans = btrfs_join_transaction(root); |
66b4ffd1 JB |
2486 | if (!IS_ERR(trans)) |
2487 | btrfs_end_transaction(trans, root); | |
d68fc57b | 2488 | } |
7b128766 JB |
2489 | |
2490 | if (nr_unlink) | |
2491 | printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); | |
2492 | if (nr_truncate) | |
2493 | printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); | |
66b4ffd1 JB |
2494 | |
2495 | out: | |
2496 | if (ret) | |
2497 | printk(KERN_CRIT "btrfs: could not do orphan cleanup %d\n", ret); | |
2498 | btrfs_free_path(path); | |
2499 | return ret; | |
7b128766 JB |
2500 | } |
2501 | ||
46a53cca CM |
2502 | /* |
2503 | * very simple check to peek ahead in the leaf looking for xattrs. If we | |
2504 | * don't find any xattrs, we know there can't be any acls. | |
2505 | * | |
2506 | * slot is the slot the inode is in, objectid is the objectid of the inode | |
2507 | */ | |
2508 | static noinline int acls_after_inode_item(struct extent_buffer *leaf, | |
2509 | int slot, u64 objectid) | |
2510 | { | |
2511 | u32 nritems = btrfs_header_nritems(leaf); | |
2512 | struct btrfs_key found_key; | |
2513 | int scanned = 0; | |
2514 | ||
2515 | slot++; | |
2516 | while (slot < nritems) { | |
2517 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2518 | ||
2519 | /* we found a different objectid, there must not be acls */ | |
2520 | if (found_key.objectid != objectid) | |
2521 | return 0; | |
2522 | ||
2523 | /* we found an xattr, assume we've got an acl */ | |
2524 | if (found_key.type == BTRFS_XATTR_ITEM_KEY) | |
2525 | return 1; | |
2526 | ||
2527 | /* | |
2528 | * we found a key greater than an xattr key, there can't | |
2529 | * be any acls later on | |
2530 | */ | |
2531 | if (found_key.type > BTRFS_XATTR_ITEM_KEY) | |
2532 | return 0; | |
2533 | ||
2534 | slot++; | |
2535 | scanned++; | |
2536 | ||
2537 | /* | |
2538 | * it goes inode, inode backrefs, xattrs, extents, | |
2539 | * so if there are a ton of hard links to an inode there can | |
2540 | * be a lot of backrefs. Don't waste time searching too hard, | |
2541 | * this is just an optimization | |
2542 | */ | |
2543 | if (scanned >= 8) | |
2544 | break; | |
2545 | } | |
2546 | /* we hit the end of the leaf before we found an xattr or | |
2547 | * something larger than an xattr. We have to assume the inode | |
2548 | * has acls | |
2549 | */ | |
2550 | return 1; | |
2551 | } | |
2552 | ||
d352ac68 CM |
2553 | /* |
2554 | * read an inode from the btree into the in-memory inode | |
2555 | */ | |
5d4f98a2 | 2556 | static void btrfs_read_locked_inode(struct inode *inode) |
39279cc3 CM |
2557 | { |
2558 | struct btrfs_path *path; | |
5f39d397 | 2559 | struct extent_buffer *leaf; |
39279cc3 | 2560 | struct btrfs_inode_item *inode_item; |
0b86a832 | 2561 | struct btrfs_timespec *tspec; |
39279cc3 CM |
2562 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2563 | struct btrfs_key location; | |
46a53cca | 2564 | int maybe_acls; |
618e21d5 | 2565 | u32 rdev; |
39279cc3 | 2566 | int ret; |
2f7e33d4 MX |
2567 | bool filled = false; |
2568 | ||
2569 | ret = btrfs_fill_inode(inode, &rdev); | |
2570 | if (!ret) | |
2571 | filled = true; | |
39279cc3 CM |
2572 | |
2573 | path = btrfs_alloc_path(); | |
1748f843 MF |
2574 | if (!path) |
2575 | goto make_bad; | |
2576 | ||
d90c7321 | 2577 | path->leave_spinning = 1; |
39279cc3 | 2578 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 2579 | |
39279cc3 | 2580 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 2581 | if (ret) |
39279cc3 | 2582 | goto make_bad; |
39279cc3 | 2583 | |
5f39d397 | 2584 | leaf = path->nodes[0]; |
2f7e33d4 MX |
2585 | |
2586 | if (filled) | |
2587 | goto cache_acl; | |
2588 | ||
5f39d397 CM |
2589 | inode_item = btrfs_item_ptr(leaf, path->slots[0], |
2590 | struct btrfs_inode_item); | |
5f39d397 | 2591 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); |
bfe86848 | 2592 | set_nlink(inode, btrfs_inode_nlink(leaf, inode_item)); |
2f2f43d3 EB |
2593 | i_uid_write(inode, btrfs_inode_uid(leaf, inode_item)); |
2594 | i_gid_write(inode, btrfs_inode_gid(leaf, inode_item)); | |
dbe674a9 | 2595 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 CM |
2596 | |
2597 | tspec = btrfs_inode_atime(inode_item); | |
2598 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
2599 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
2600 | ||
2601 | tspec = btrfs_inode_mtime(inode_item); | |
2602 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
2603 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
2604 | ||
2605 | tspec = btrfs_inode_ctime(inode_item); | |
2606 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
2607 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
2608 | ||
a76a3cd4 | 2609 | inode_set_bytes(inode, btrfs_inode_nbytes(leaf, inode_item)); |
e02119d5 | 2610 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
5dc562c5 JB |
2611 | BTRFS_I(inode)->last_trans = btrfs_inode_transid(leaf, inode_item); |
2612 | ||
2613 | /* | |
2614 | * If we were modified in the current generation and evicted from memory | |
2615 | * and then re-read we need to do a full sync since we don't have any | |
2616 | * idea about which extents were modified before we were evicted from | |
2617 | * cache. | |
2618 | */ | |
2619 | if (BTRFS_I(inode)->last_trans == root->fs_info->generation) | |
2620 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
2621 | &BTRFS_I(inode)->runtime_flags); | |
2622 | ||
0c4d2d95 | 2623 | inode->i_version = btrfs_inode_sequence(leaf, inode_item); |
e02119d5 | 2624 | inode->i_generation = BTRFS_I(inode)->generation; |
618e21d5 | 2625 | inode->i_rdev = 0; |
5f39d397 CM |
2626 | rdev = btrfs_inode_rdev(leaf, inode_item); |
2627 | ||
aec7477b | 2628 | BTRFS_I(inode)->index_cnt = (u64)-1; |
d2fb3437 | 2629 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
2f7e33d4 | 2630 | cache_acl: |
46a53cca CM |
2631 | /* |
2632 | * try to precache a NULL acl entry for files that don't have | |
2633 | * any xattrs or acls | |
2634 | */ | |
33345d01 LZ |
2635 | maybe_acls = acls_after_inode_item(leaf, path->slots[0], |
2636 | btrfs_ino(inode)); | |
72c04902 AV |
2637 | if (!maybe_acls) |
2638 | cache_no_acl(inode); | |
46a53cca | 2639 | |
39279cc3 | 2640 | btrfs_free_path(path); |
39279cc3 | 2641 | |
39279cc3 | 2642 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
2643 | case S_IFREG: |
2644 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 2645 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 2646 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
2647 | inode->i_fop = &btrfs_file_operations; |
2648 | inode->i_op = &btrfs_file_inode_operations; | |
2649 | break; | |
2650 | case S_IFDIR: | |
2651 | inode->i_fop = &btrfs_dir_file_operations; | |
2652 | if (root == root->fs_info->tree_root) | |
2653 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
2654 | else | |
2655 | inode->i_op = &btrfs_dir_inode_operations; | |
2656 | break; | |
2657 | case S_IFLNK: | |
2658 | inode->i_op = &btrfs_symlink_inode_operations; | |
2659 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 2660 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 2661 | break; |
618e21d5 | 2662 | default: |
0279b4cd | 2663 | inode->i_op = &btrfs_special_inode_operations; |
618e21d5 JB |
2664 | init_special_inode(inode, inode->i_mode, rdev); |
2665 | break; | |
39279cc3 | 2666 | } |
6cbff00f CH |
2667 | |
2668 | btrfs_update_iflags(inode); | |
39279cc3 CM |
2669 | return; |
2670 | ||
2671 | make_bad: | |
39279cc3 | 2672 | btrfs_free_path(path); |
39279cc3 CM |
2673 | make_bad_inode(inode); |
2674 | } | |
2675 | ||
d352ac68 CM |
2676 | /* |
2677 | * given a leaf and an inode, copy the inode fields into the leaf | |
2678 | */ | |
e02119d5 CM |
2679 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
2680 | struct extent_buffer *leaf, | |
5f39d397 | 2681 | struct btrfs_inode_item *item, |
39279cc3 CM |
2682 | struct inode *inode) |
2683 | { | |
2f2f43d3 EB |
2684 | btrfs_set_inode_uid(leaf, item, i_uid_read(inode)); |
2685 | btrfs_set_inode_gid(leaf, item, i_gid_read(inode)); | |
dbe674a9 | 2686 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
5f39d397 CM |
2687 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
2688 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
2689 | ||
2690 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
2691 | inode->i_atime.tv_sec); | |
2692 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
2693 | inode->i_atime.tv_nsec); | |
2694 | ||
2695 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
2696 | inode->i_mtime.tv_sec); | |
2697 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
2698 | inode->i_mtime.tv_nsec); | |
2699 | ||
2700 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
2701 | inode->i_ctime.tv_sec); | |
2702 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
2703 | inode->i_ctime.tv_nsec); | |
2704 | ||
a76a3cd4 | 2705 | btrfs_set_inode_nbytes(leaf, item, inode_get_bytes(inode)); |
e02119d5 | 2706 | btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation); |
0c4d2d95 | 2707 | btrfs_set_inode_sequence(leaf, item, inode->i_version); |
e02119d5 | 2708 | btrfs_set_inode_transid(leaf, item, trans->transid); |
5f39d397 | 2709 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); |
b98b6767 | 2710 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
d82a6f1d | 2711 | btrfs_set_inode_block_group(leaf, item, 0); |
39279cc3 CM |
2712 | } |
2713 | ||
d352ac68 CM |
2714 | /* |
2715 | * copy everything in the in-memory inode into the btree. | |
2716 | */ | |
2115133f | 2717 | static noinline int btrfs_update_inode_item(struct btrfs_trans_handle *trans, |
d397712b | 2718 | struct btrfs_root *root, struct inode *inode) |
39279cc3 CM |
2719 | { |
2720 | struct btrfs_inode_item *inode_item; | |
2721 | struct btrfs_path *path; | |
5f39d397 | 2722 | struct extent_buffer *leaf; |
39279cc3 CM |
2723 | int ret; |
2724 | ||
2725 | path = btrfs_alloc_path(); | |
16cdcec7 MX |
2726 | if (!path) |
2727 | return -ENOMEM; | |
2728 | ||
b9473439 | 2729 | path->leave_spinning = 1; |
16cdcec7 MX |
2730 | ret = btrfs_lookup_inode(trans, root, path, &BTRFS_I(inode)->location, |
2731 | 1); | |
39279cc3 CM |
2732 | if (ret) { |
2733 | if (ret > 0) | |
2734 | ret = -ENOENT; | |
2735 | goto failed; | |
2736 | } | |
2737 | ||
b4ce94de | 2738 | btrfs_unlock_up_safe(path, 1); |
5f39d397 CM |
2739 | leaf = path->nodes[0]; |
2740 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
16cdcec7 | 2741 | struct btrfs_inode_item); |
39279cc3 | 2742 | |
e02119d5 | 2743 | fill_inode_item(trans, leaf, inode_item, inode); |
5f39d397 | 2744 | btrfs_mark_buffer_dirty(leaf); |
15ee9bc7 | 2745 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
2746 | ret = 0; |
2747 | failed: | |
39279cc3 CM |
2748 | btrfs_free_path(path); |
2749 | return ret; | |
2750 | } | |
2751 | ||
2115133f CM |
2752 | /* |
2753 | * copy everything in the in-memory inode into the btree. | |
2754 | */ | |
2755 | noinline int btrfs_update_inode(struct btrfs_trans_handle *trans, | |
2756 | struct btrfs_root *root, struct inode *inode) | |
2757 | { | |
2758 | int ret; | |
2759 | ||
2760 | /* | |
2761 | * If the inode is a free space inode, we can deadlock during commit | |
2762 | * if we put it into the delayed code. | |
2763 | * | |
2764 | * The data relocation inode should also be directly updated | |
2765 | * without delay | |
2766 | */ | |
83eea1f1 | 2767 | if (!btrfs_is_free_space_inode(inode) |
2115133f | 2768 | && root->root_key.objectid != BTRFS_DATA_RELOC_TREE_OBJECTID) { |
8ea05e3a AB |
2769 | btrfs_update_root_times(trans, root); |
2770 | ||
2115133f CM |
2771 | ret = btrfs_delayed_update_inode(trans, root, inode); |
2772 | if (!ret) | |
2773 | btrfs_set_inode_last_trans(trans, inode); | |
2774 | return ret; | |
2775 | } | |
2776 | ||
2777 | return btrfs_update_inode_item(trans, root, inode); | |
2778 | } | |
2779 | ||
be6aef60 JB |
2780 | noinline int btrfs_update_inode_fallback(struct btrfs_trans_handle *trans, |
2781 | struct btrfs_root *root, | |
2782 | struct inode *inode) | |
2115133f CM |
2783 | { |
2784 | int ret; | |
2785 | ||
2786 | ret = btrfs_update_inode(trans, root, inode); | |
2787 | if (ret == -ENOSPC) | |
2788 | return btrfs_update_inode_item(trans, root, inode); | |
2789 | return ret; | |
2790 | } | |
2791 | ||
d352ac68 CM |
2792 | /* |
2793 | * unlink helper that gets used here in inode.c and in the tree logging | |
2794 | * recovery code. It remove a link in a directory with a given name, and | |
2795 | * also drops the back refs in the inode to the directory | |
2796 | */ | |
92986796 AV |
2797 | static int __btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
2798 | struct btrfs_root *root, | |
2799 | struct inode *dir, struct inode *inode, | |
2800 | const char *name, int name_len) | |
39279cc3 CM |
2801 | { |
2802 | struct btrfs_path *path; | |
39279cc3 | 2803 | int ret = 0; |
5f39d397 | 2804 | struct extent_buffer *leaf; |
39279cc3 | 2805 | struct btrfs_dir_item *di; |
5f39d397 | 2806 | struct btrfs_key key; |
aec7477b | 2807 | u64 index; |
33345d01 LZ |
2808 | u64 ino = btrfs_ino(inode); |
2809 | u64 dir_ino = btrfs_ino(dir); | |
39279cc3 CM |
2810 | |
2811 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
2812 | if (!path) { |
2813 | ret = -ENOMEM; | |
554233a6 | 2814 | goto out; |
54aa1f4d CM |
2815 | } |
2816 | ||
b9473439 | 2817 | path->leave_spinning = 1; |
33345d01 | 2818 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
39279cc3 CM |
2819 | name, name_len, -1); |
2820 | if (IS_ERR(di)) { | |
2821 | ret = PTR_ERR(di); | |
2822 | goto err; | |
2823 | } | |
2824 | if (!di) { | |
2825 | ret = -ENOENT; | |
2826 | goto err; | |
2827 | } | |
5f39d397 CM |
2828 | leaf = path->nodes[0]; |
2829 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 2830 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
2831 | if (ret) |
2832 | goto err; | |
b3b4aa74 | 2833 | btrfs_release_path(path); |
39279cc3 | 2834 | |
33345d01 LZ |
2835 | ret = btrfs_del_inode_ref(trans, root, name, name_len, ino, |
2836 | dir_ino, &index); | |
aec7477b | 2837 | if (ret) { |
d397712b | 2838 | printk(KERN_INFO "btrfs failed to delete reference to %.*s, " |
33345d01 LZ |
2839 | "inode %llu parent %llu\n", name_len, name, |
2840 | (unsigned long long)ino, (unsigned long long)dir_ino); | |
79787eaa | 2841 | btrfs_abort_transaction(trans, root, ret); |
aec7477b JB |
2842 | goto err; |
2843 | } | |
2844 | ||
16cdcec7 | 2845 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
2846 | if (ret) { |
2847 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 2848 | goto err; |
79787eaa | 2849 | } |
39279cc3 | 2850 | |
e02119d5 | 2851 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
33345d01 | 2852 | inode, dir_ino); |
79787eaa JM |
2853 | if (ret != 0 && ret != -ENOENT) { |
2854 | btrfs_abort_transaction(trans, root, ret); | |
2855 | goto err; | |
2856 | } | |
e02119d5 CM |
2857 | |
2858 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, | |
2859 | dir, index); | |
6418c961 CM |
2860 | if (ret == -ENOENT) |
2861 | ret = 0; | |
39279cc3 CM |
2862 | err: |
2863 | btrfs_free_path(path); | |
e02119d5 CM |
2864 | if (ret) |
2865 | goto out; | |
2866 | ||
2867 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 JB |
2868 | inode_inc_iversion(inode); |
2869 | inode_inc_iversion(dir); | |
e02119d5 | 2870 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
b9959295 | 2871 | ret = btrfs_update_inode(trans, root, dir); |
e02119d5 | 2872 | out: |
39279cc3 CM |
2873 | return ret; |
2874 | } | |
2875 | ||
92986796 AV |
2876 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
2877 | struct btrfs_root *root, | |
2878 | struct inode *dir, struct inode *inode, | |
2879 | const char *name, int name_len) | |
2880 | { | |
2881 | int ret; | |
2882 | ret = __btrfs_unlink_inode(trans, root, dir, inode, name, name_len); | |
2883 | if (!ret) { | |
2884 | btrfs_drop_nlink(inode); | |
2885 | ret = btrfs_update_inode(trans, root, inode); | |
2886 | } | |
2887 | return ret; | |
2888 | } | |
2889 | ||
2890 | ||
a22285a6 YZ |
2891 | /* helper to check if there is any shared block in the path */ |
2892 | static int check_path_shared(struct btrfs_root *root, | |
2893 | struct btrfs_path *path) | |
39279cc3 | 2894 | { |
a22285a6 YZ |
2895 | struct extent_buffer *eb; |
2896 | int level; | |
0e4dcbef | 2897 | u64 refs = 1; |
5df6a9f6 | 2898 | |
a22285a6 | 2899 | for (level = 0; level < BTRFS_MAX_LEVEL; level++) { |
dedefd72 JB |
2900 | int ret; |
2901 | ||
a22285a6 YZ |
2902 | if (!path->nodes[level]) |
2903 | break; | |
2904 | eb = path->nodes[level]; | |
2905 | if (!btrfs_block_can_be_shared(root, eb)) | |
2906 | continue; | |
2907 | ret = btrfs_lookup_extent_info(NULL, root, eb->start, eb->len, | |
2908 | &refs, NULL); | |
2909 | if (refs > 1) | |
2910 | return 1; | |
5df6a9f6 | 2911 | } |
dedefd72 | 2912 | return 0; |
39279cc3 CM |
2913 | } |
2914 | ||
a22285a6 YZ |
2915 | /* |
2916 | * helper to start transaction for unlink and rmdir. | |
2917 | * | |
2918 | * unlink and rmdir are special in btrfs, they do not always free space. | |
2919 | * so in enospc case, we should make sure they will free space before | |
2920 | * allowing them to use the global metadata reservation. | |
2921 | */ | |
2922 | static struct btrfs_trans_handle *__unlink_start_trans(struct inode *dir, | |
2923 | struct dentry *dentry) | |
4df27c4d | 2924 | { |
39279cc3 | 2925 | struct btrfs_trans_handle *trans; |
a22285a6 | 2926 | struct btrfs_root *root = BTRFS_I(dir)->root; |
4df27c4d | 2927 | struct btrfs_path *path; |
4df27c4d | 2928 | struct btrfs_dir_item *di; |
7b128766 | 2929 | struct inode *inode = dentry->d_inode; |
4df27c4d | 2930 | u64 index; |
a22285a6 YZ |
2931 | int check_link = 1; |
2932 | int err = -ENOSPC; | |
4df27c4d | 2933 | int ret; |
33345d01 LZ |
2934 | u64 ino = btrfs_ino(inode); |
2935 | u64 dir_ino = btrfs_ino(dir); | |
4df27c4d | 2936 | |
e70bea5f JB |
2937 | /* |
2938 | * 1 for the possible orphan item | |
2939 | * 1 for the dir item | |
2940 | * 1 for the dir index | |
2941 | * 1 for the inode ref | |
2942 | * 1 for the inode ref in the tree log | |
2943 | * 2 for the dir entries in the log | |
2944 | * 1 for the inode | |
2945 | */ | |
2946 | trans = btrfs_start_transaction(root, 8); | |
a22285a6 YZ |
2947 | if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC) |
2948 | return trans; | |
4df27c4d | 2949 | |
33345d01 | 2950 | if (ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
a22285a6 | 2951 | return ERR_PTR(-ENOSPC); |
4df27c4d | 2952 | |
a22285a6 YZ |
2953 | /* check if there is someone else holds reference */ |
2954 | if (S_ISDIR(inode->i_mode) && atomic_read(&inode->i_count) > 1) | |
2955 | return ERR_PTR(-ENOSPC); | |
4df27c4d | 2956 | |
a22285a6 YZ |
2957 | if (atomic_read(&inode->i_count) > 2) |
2958 | return ERR_PTR(-ENOSPC); | |
4df27c4d | 2959 | |
a22285a6 YZ |
2960 | if (xchg(&root->fs_info->enospc_unlink, 1)) |
2961 | return ERR_PTR(-ENOSPC); | |
2962 | ||
2963 | path = btrfs_alloc_path(); | |
2964 | if (!path) { | |
2965 | root->fs_info->enospc_unlink = 0; | |
2966 | return ERR_PTR(-ENOMEM); | |
4df27c4d YZ |
2967 | } |
2968 | ||
3880a1b4 JB |
2969 | /* 1 for the orphan item */ |
2970 | trans = btrfs_start_transaction(root, 1); | |
5df6a9f6 | 2971 | if (IS_ERR(trans)) { |
a22285a6 YZ |
2972 | btrfs_free_path(path); |
2973 | root->fs_info->enospc_unlink = 0; | |
2974 | return trans; | |
2975 | } | |
4df27c4d | 2976 | |
a22285a6 YZ |
2977 | path->skip_locking = 1; |
2978 | path->search_commit_root = 1; | |
4df27c4d | 2979 | |
a22285a6 YZ |
2980 | ret = btrfs_lookup_inode(trans, root, path, |
2981 | &BTRFS_I(dir)->location, 0); | |
2982 | if (ret < 0) { | |
2983 | err = ret; | |
2984 | goto out; | |
2985 | } | |
2986 | if (ret == 0) { | |
2987 | if (check_path_shared(root, path)) | |
2988 | goto out; | |
2989 | } else { | |
2990 | check_link = 0; | |
5df6a9f6 | 2991 | } |
b3b4aa74 | 2992 | btrfs_release_path(path); |
a22285a6 YZ |
2993 | |
2994 | ret = btrfs_lookup_inode(trans, root, path, | |
2995 | &BTRFS_I(inode)->location, 0); | |
2996 | if (ret < 0) { | |
2997 | err = ret; | |
2998 | goto out; | |
2999 | } | |
3000 | if (ret == 0) { | |
3001 | if (check_path_shared(root, path)) | |
3002 | goto out; | |
3003 | } else { | |
3004 | check_link = 0; | |
3005 | } | |
b3b4aa74 | 3006 | btrfs_release_path(path); |
a22285a6 YZ |
3007 | |
3008 | if (ret == 0 && S_ISREG(inode->i_mode)) { | |
3009 | ret = btrfs_lookup_file_extent(trans, root, path, | |
33345d01 | 3010 | ino, (u64)-1, 0); |
a22285a6 YZ |
3011 | if (ret < 0) { |
3012 | err = ret; | |
3013 | goto out; | |
3014 | } | |
79787eaa | 3015 | BUG_ON(ret == 0); /* Corruption */ |
a22285a6 YZ |
3016 | if (check_path_shared(root, path)) |
3017 | goto out; | |
b3b4aa74 | 3018 | btrfs_release_path(path); |
a22285a6 YZ |
3019 | } |
3020 | ||
3021 | if (!check_link) { | |
3022 | err = 0; | |
3023 | goto out; | |
3024 | } | |
3025 | ||
33345d01 | 3026 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
a22285a6 YZ |
3027 | dentry->d_name.name, dentry->d_name.len, 0); |
3028 | if (IS_ERR(di)) { | |
3029 | err = PTR_ERR(di); | |
3030 | goto out; | |
3031 | } | |
3032 | if (di) { | |
3033 | if (check_path_shared(root, path)) | |
3034 | goto out; | |
3035 | } else { | |
3036 | err = 0; | |
3037 | goto out; | |
3038 | } | |
b3b4aa74 | 3039 | btrfs_release_path(path); |
a22285a6 | 3040 | |
f186373f MF |
3041 | ret = btrfs_get_inode_ref_index(trans, root, path, dentry->d_name.name, |
3042 | dentry->d_name.len, ino, dir_ino, 0, | |
3043 | &index); | |
3044 | if (ret) { | |
3045 | err = ret; | |
a22285a6 YZ |
3046 | goto out; |
3047 | } | |
f186373f | 3048 | |
a22285a6 YZ |
3049 | if (check_path_shared(root, path)) |
3050 | goto out; | |
f186373f | 3051 | |
b3b4aa74 | 3052 | btrfs_release_path(path); |
a22285a6 | 3053 | |
16cdcec7 MX |
3054 | /* |
3055 | * This is a commit root search, if we can lookup inode item and other | |
3056 | * relative items in the commit root, it means the transaction of | |
3057 | * dir/file creation has been committed, and the dir index item that we | |
3058 | * delay to insert has also been inserted into the commit root. So | |
3059 | * we needn't worry about the delayed insertion of the dir index item | |
3060 | * here. | |
3061 | */ | |
33345d01 | 3062 | di = btrfs_lookup_dir_index_item(trans, root, path, dir_ino, index, |
a22285a6 YZ |
3063 | dentry->d_name.name, dentry->d_name.len, 0); |
3064 | if (IS_ERR(di)) { | |
3065 | err = PTR_ERR(di); | |
3066 | goto out; | |
3067 | } | |
3068 | BUG_ON(ret == -ENOENT); | |
3069 | if (check_path_shared(root, path)) | |
3070 | goto out; | |
3071 | ||
3072 | err = 0; | |
3073 | out: | |
3074 | btrfs_free_path(path); | |
3880a1b4 JB |
3075 | /* Migrate the orphan reservation over */ |
3076 | if (!err) | |
3077 | err = btrfs_block_rsv_migrate(trans->block_rsv, | |
3078 | &root->fs_info->global_block_rsv, | |
5a77d76c | 3079 | trans->bytes_reserved); |
3880a1b4 | 3080 | |
a22285a6 YZ |
3081 | if (err) { |
3082 | btrfs_end_transaction(trans, root); | |
3083 | root->fs_info->enospc_unlink = 0; | |
3084 | return ERR_PTR(err); | |
3085 | } | |
3086 | ||
3087 | trans->block_rsv = &root->fs_info->global_block_rsv; | |
3088 | return trans; | |
3089 | } | |
3090 | ||
3091 | static void __unlink_end_trans(struct btrfs_trans_handle *trans, | |
3092 | struct btrfs_root *root) | |
3093 | { | |
66d8f3dd | 3094 | if (trans->block_rsv->type == BTRFS_BLOCK_RSV_GLOBAL) { |
5a77d76c JB |
3095 | btrfs_block_rsv_release(root, trans->block_rsv, |
3096 | trans->bytes_reserved); | |
3097 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
a22285a6 YZ |
3098 | BUG_ON(!root->fs_info->enospc_unlink); |
3099 | root->fs_info->enospc_unlink = 0; | |
3100 | } | |
7ad85bb7 | 3101 | btrfs_end_transaction(trans, root); |
a22285a6 YZ |
3102 | } |
3103 | ||
3104 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
3105 | { | |
3106 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
3107 | struct btrfs_trans_handle *trans; | |
3108 | struct inode *inode = dentry->d_inode; | |
3109 | int ret; | |
a22285a6 YZ |
3110 | |
3111 | trans = __unlink_start_trans(dir, dentry); | |
3112 | if (IS_ERR(trans)) | |
3113 | return PTR_ERR(trans); | |
5f39d397 | 3114 | |
12fcfd22 CM |
3115 | btrfs_record_unlink_dir(trans, dir, dentry->d_inode, 0); |
3116 | ||
e02119d5 CM |
3117 | ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
3118 | dentry->d_name.name, dentry->d_name.len); | |
b532402e TI |
3119 | if (ret) |
3120 | goto out; | |
7b128766 | 3121 | |
a22285a6 | 3122 | if (inode->i_nlink == 0) { |
7b128766 | 3123 | ret = btrfs_orphan_add(trans, inode); |
b532402e TI |
3124 | if (ret) |
3125 | goto out; | |
a22285a6 | 3126 | } |
7b128766 | 3127 | |
b532402e | 3128 | out: |
a22285a6 | 3129 | __unlink_end_trans(trans, root); |
b53d3f5d | 3130 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
3131 | return ret; |
3132 | } | |
3133 | ||
4df27c4d YZ |
3134 | int btrfs_unlink_subvol(struct btrfs_trans_handle *trans, |
3135 | struct btrfs_root *root, | |
3136 | struct inode *dir, u64 objectid, | |
3137 | const char *name, int name_len) | |
3138 | { | |
3139 | struct btrfs_path *path; | |
3140 | struct extent_buffer *leaf; | |
3141 | struct btrfs_dir_item *di; | |
3142 | struct btrfs_key key; | |
3143 | u64 index; | |
3144 | int ret; | |
33345d01 | 3145 | u64 dir_ino = btrfs_ino(dir); |
4df27c4d YZ |
3146 | |
3147 | path = btrfs_alloc_path(); | |
3148 | if (!path) | |
3149 | return -ENOMEM; | |
3150 | ||
33345d01 | 3151 | di = btrfs_lookup_dir_item(trans, root, path, dir_ino, |
4df27c4d | 3152 | name, name_len, -1); |
79787eaa JM |
3153 | if (IS_ERR_OR_NULL(di)) { |
3154 | if (!di) | |
3155 | ret = -ENOENT; | |
3156 | else | |
3157 | ret = PTR_ERR(di); | |
3158 | goto out; | |
3159 | } | |
4df27c4d YZ |
3160 | |
3161 | leaf = path->nodes[0]; | |
3162 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
3163 | WARN_ON(key.type != BTRFS_ROOT_ITEM_KEY || key.objectid != objectid); | |
3164 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
79787eaa JM |
3165 | if (ret) { |
3166 | btrfs_abort_transaction(trans, root, ret); | |
3167 | goto out; | |
3168 | } | |
b3b4aa74 | 3169 | btrfs_release_path(path); |
4df27c4d YZ |
3170 | |
3171 | ret = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
3172 | objectid, root->root_key.objectid, | |
33345d01 | 3173 | dir_ino, &index, name, name_len); |
4df27c4d | 3174 | if (ret < 0) { |
79787eaa JM |
3175 | if (ret != -ENOENT) { |
3176 | btrfs_abort_transaction(trans, root, ret); | |
3177 | goto out; | |
3178 | } | |
33345d01 | 3179 | di = btrfs_search_dir_index_item(root, path, dir_ino, |
4df27c4d | 3180 | name, name_len); |
79787eaa JM |
3181 | if (IS_ERR_OR_NULL(di)) { |
3182 | if (!di) | |
3183 | ret = -ENOENT; | |
3184 | else | |
3185 | ret = PTR_ERR(di); | |
3186 | btrfs_abort_transaction(trans, root, ret); | |
3187 | goto out; | |
3188 | } | |
4df27c4d YZ |
3189 | |
3190 | leaf = path->nodes[0]; | |
3191 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
b3b4aa74 | 3192 | btrfs_release_path(path); |
4df27c4d YZ |
3193 | index = key.offset; |
3194 | } | |
945d8962 | 3195 | btrfs_release_path(path); |
4df27c4d | 3196 | |
16cdcec7 | 3197 | ret = btrfs_delete_delayed_dir_index(trans, root, dir, index); |
79787eaa JM |
3198 | if (ret) { |
3199 | btrfs_abort_transaction(trans, root, ret); | |
3200 | goto out; | |
3201 | } | |
4df27c4d YZ |
3202 | |
3203 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
0c4d2d95 | 3204 | inode_inc_iversion(dir); |
4df27c4d | 3205 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
5a24e84c | 3206 | ret = btrfs_update_inode_fallback(trans, root, dir); |
79787eaa JM |
3207 | if (ret) |
3208 | btrfs_abort_transaction(trans, root, ret); | |
3209 | out: | |
71d7aed0 | 3210 | btrfs_free_path(path); |
79787eaa | 3211 | return ret; |
4df27c4d YZ |
3212 | } |
3213 | ||
39279cc3 CM |
3214 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) |
3215 | { | |
3216 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 3217 | int err = 0; |
39279cc3 | 3218 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 | 3219 | struct btrfs_trans_handle *trans; |
39279cc3 | 3220 | |
b3ae244e | 3221 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
134d4512 | 3222 | return -ENOTEMPTY; |
b3ae244e DS |
3223 | if (btrfs_ino(inode) == BTRFS_FIRST_FREE_OBJECTID) |
3224 | return -EPERM; | |
134d4512 | 3225 | |
a22285a6 YZ |
3226 | trans = __unlink_start_trans(dir, dentry); |
3227 | if (IS_ERR(trans)) | |
5df6a9f6 | 3228 | return PTR_ERR(trans); |
5df6a9f6 | 3229 | |
33345d01 | 3230 | if (unlikely(btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
4df27c4d YZ |
3231 | err = btrfs_unlink_subvol(trans, root, dir, |
3232 | BTRFS_I(inode)->location.objectid, | |
3233 | dentry->d_name.name, | |
3234 | dentry->d_name.len); | |
3235 | goto out; | |
3236 | } | |
3237 | ||
7b128766 JB |
3238 | err = btrfs_orphan_add(trans, inode); |
3239 | if (err) | |
4df27c4d | 3240 | goto out; |
7b128766 | 3241 | |
39279cc3 | 3242 | /* now the directory is empty */ |
e02119d5 CM |
3243 | err = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
3244 | dentry->d_name.name, dentry->d_name.len); | |
d397712b | 3245 | if (!err) |
dbe674a9 | 3246 | btrfs_i_size_write(inode, 0); |
4df27c4d | 3247 | out: |
a22285a6 | 3248 | __unlink_end_trans(trans, root); |
b53d3f5d | 3249 | btrfs_btree_balance_dirty(root); |
3954401f | 3250 | |
39279cc3 CM |
3251 | return err; |
3252 | } | |
3253 | ||
39279cc3 CM |
3254 | /* |
3255 | * this can truncate away extent items, csum items and directory items. | |
3256 | * It starts at a high offset and removes keys until it can't find | |
d352ac68 | 3257 | * any higher than new_size |
39279cc3 CM |
3258 | * |
3259 | * csum items that cross the new i_size are truncated to the new size | |
3260 | * as well. | |
7b128766 JB |
3261 | * |
3262 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
3263 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 | 3264 | */ |
8082510e YZ |
3265 | int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
3266 | struct btrfs_root *root, | |
3267 | struct inode *inode, | |
3268 | u64 new_size, u32 min_type) | |
39279cc3 | 3269 | { |
39279cc3 | 3270 | struct btrfs_path *path; |
5f39d397 | 3271 | struct extent_buffer *leaf; |
39279cc3 | 3272 | struct btrfs_file_extent_item *fi; |
8082510e YZ |
3273 | struct btrfs_key key; |
3274 | struct btrfs_key found_key; | |
39279cc3 | 3275 | u64 extent_start = 0; |
db94535d | 3276 | u64 extent_num_bytes = 0; |
5d4f98a2 | 3277 | u64 extent_offset = 0; |
39279cc3 | 3278 | u64 item_end = 0; |
8082510e YZ |
3279 | u64 mask = root->sectorsize - 1; |
3280 | u32 found_type = (u8)-1; | |
39279cc3 CM |
3281 | int found_extent; |
3282 | int del_item; | |
85e21bac CM |
3283 | int pending_del_nr = 0; |
3284 | int pending_del_slot = 0; | |
179e29e4 | 3285 | int extent_type = -1; |
8082510e YZ |
3286 | int ret; |
3287 | int err = 0; | |
33345d01 | 3288 | u64 ino = btrfs_ino(inode); |
8082510e YZ |
3289 | |
3290 | BUG_ON(new_size > 0 && min_type != BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 3291 | |
0eb0e19c MF |
3292 | path = btrfs_alloc_path(); |
3293 | if (!path) | |
3294 | return -ENOMEM; | |
3295 | path->reada = -1; | |
3296 | ||
5dc562c5 JB |
3297 | /* |
3298 | * We want to drop from the next block forward in case this new size is | |
3299 | * not block aligned since we will be keeping the last block of the | |
3300 | * extent just the way it is. | |
3301 | */ | |
0af3d00b | 3302 | if (root->ref_cows || root == root->fs_info->tree_root) |
5dc562c5 | 3303 | btrfs_drop_extent_cache(inode, (new_size + mask) & (~mask), (u64)-1, 0); |
8082510e | 3304 | |
16cdcec7 MX |
3305 | /* |
3306 | * This function is also used to drop the items in the log tree before | |
3307 | * we relog the inode, so if root != BTRFS_I(inode)->root, it means | |
3308 | * it is used to drop the loged items. So we shouldn't kill the delayed | |
3309 | * items. | |
3310 | */ | |
3311 | if (min_type == 0 && root == BTRFS_I(inode)->root) | |
3312 | btrfs_kill_delayed_inode_items(inode); | |
3313 | ||
33345d01 | 3314 | key.objectid = ino; |
39279cc3 | 3315 | key.offset = (u64)-1; |
5f39d397 CM |
3316 | key.type = (u8)-1; |
3317 | ||
85e21bac | 3318 | search_again: |
b9473439 | 3319 | path->leave_spinning = 1; |
85e21bac | 3320 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
8082510e YZ |
3321 | if (ret < 0) { |
3322 | err = ret; | |
3323 | goto out; | |
3324 | } | |
d397712b | 3325 | |
85e21bac | 3326 | if (ret > 0) { |
e02119d5 CM |
3327 | /* there are no items in the tree for us to truncate, we're |
3328 | * done | |
3329 | */ | |
8082510e YZ |
3330 | if (path->slots[0] == 0) |
3331 | goto out; | |
85e21bac CM |
3332 | path->slots[0]--; |
3333 | } | |
3334 | ||
d397712b | 3335 | while (1) { |
39279cc3 | 3336 | fi = NULL; |
5f39d397 CM |
3337 | leaf = path->nodes[0]; |
3338 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
3339 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 3340 | |
33345d01 | 3341 | if (found_key.objectid != ino) |
39279cc3 | 3342 | break; |
5f39d397 | 3343 | |
85e21bac | 3344 | if (found_type < min_type) |
39279cc3 CM |
3345 | break; |
3346 | ||
5f39d397 | 3347 | item_end = found_key.offset; |
39279cc3 | 3348 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 3349 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 3350 | struct btrfs_file_extent_item); |
179e29e4 CM |
3351 | extent_type = btrfs_file_extent_type(leaf, fi); |
3352 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 3353 | item_end += |
db94535d | 3354 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 | 3355 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
179e29e4 | 3356 | item_end += btrfs_file_extent_inline_len(leaf, |
c8b97818 | 3357 | fi); |
39279cc3 | 3358 | } |
008630c1 | 3359 | item_end--; |
39279cc3 | 3360 | } |
8082510e YZ |
3361 | if (found_type > min_type) { |
3362 | del_item = 1; | |
3363 | } else { | |
3364 | if (item_end < new_size) | |
b888db2b | 3365 | break; |
8082510e YZ |
3366 | if (found_key.offset >= new_size) |
3367 | del_item = 1; | |
3368 | else | |
3369 | del_item = 0; | |
39279cc3 | 3370 | } |
39279cc3 | 3371 | found_extent = 0; |
39279cc3 | 3372 | /* FIXME, shrink the extent if the ref count is only 1 */ |
179e29e4 CM |
3373 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
3374 | goto delete; | |
3375 | ||
3376 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 3377 | u64 num_dec; |
db94535d | 3378 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
f70a9a6b | 3379 | if (!del_item) { |
db94535d CM |
3380 | u64 orig_num_bytes = |
3381 | btrfs_file_extent_num_bytes(leaf, fi); | |
e02119d5 | 3382 | extent_num_bytes = new_size - |
5f39d397 | 3383 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
3384 | extent_num_bytes = extent_num_bytes & |
3385 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
3386 | btrfs_set_file_extent_num_bytes(leaf, fi, |
3387 | extent_num_bytes); | |
3388 | num_dec = (orig_num_bytes - | |
9069218d | 3389 | extent_num_bytes); |
e02119d5 | 3390 | if (root->ref_cows && extent_start != 0) |
a76a3cd4 | 3391 | inode_sub_bytes(inode, num_dec); |
5f39d397 | 3392 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 3393 | } else { |
db94535d CM |
3394 | extent_num_bytes = |
3395 | btrfs_file_extent_disk_num_bytes(leaf, | |
3396 | fi); | |
5d4f98a2 YZ |
3397 | extent_offset = found_key.offset - |
3398 | btrfs_file_extent_offset(leaf, fi); | |
3399 | ||
39279cc3 | 3400 | /* FIXME blocksize != 4096 */ |
9069218d | 3401 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
3402 | if (extent_start != 0) { |
3403 | found_extent = 1; | |
e02119d5 | 3404 | if (root->ref_cows) |
a76a3cd4 | 3405 | inode_sub_bytes(inode, num_dec); |
e02119d5 | 3406 | } |
39279cc3 | 3407 | } |
9069218d | 3408 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
c8b97818 CM |
3409 | /* |
3410 | * we can't truncate inline items that have had | |
3411 | * special encodings | |
3412 | */ | |
3413 | if (!del_item && | |
3414 | btrfs_file_extent_compression(leaf, fi) == 0 && | |
3415 | btrfs_file_extent_encryption(leaf, fi) == 0 && | |
3416 | btrfs_file_extent_other_encoding(leaf, fi) == 0) { | |
e02119d5 CM |
3417 | u32 size = new_size - found_key.offset; |
3418 | ||
3419 | if (root->ref_cows) { | |
a76a3cd4 YZ |
3420 | inode_sub_bytes(inode, item_end + 1 - |
3421 | new_size); | |
e02119d5 CM |
3422 | } |
3423 | size = | |
3424 | btrfs_file_extent_calc_inline_size(size); | |
143bede5 JM |
3425 | btrfs_truncate_item(trans, root, path, |
3426 | size, 1); | |
e02119d5 | 3427 | } else if (root->ref_cows) { |
a76a3cd4 YZ |
3428 | inode_sub_bytes(inode, item_end + 1 - |
3429 | found_key.offset); | |
9069218d | 3430 | } |
39279cc3 | 3431 | } |
179e29e4 | 3432 | delete: |
39279cc3 | 3433 | if (del_item) { |
85e21bac CM |
3434 | if (!pending_del_nr) { |
3435 | /* no pending yet, add ourselves */ | |
3436 | pending_del_slot = path->slots[0]; | |
3437 | pending_del_nr = 1; | |
3438 | } else if (pending_del_nr && | |
3439 | path->slots[0] + 1 == pending_del_slot) { | |
3440 | /* hop on the pending chunk */ | |
3441 | pending_del_nr++; | |
3442 | pending_del_slot = path->slots[0]; | |
3443 | } else { | |
d397712b | 3444 | BUG(); |
85e21bac | 3445 | } |
39279cc3 CM |
3446 | } else { |
3447 | break; | |
3448 | } | |
0af3d00b JB |
3449 | if (found_extent && (root->ref_cows || |
3450 | root == root->fs_info->tree_root)) { | |
b9473439 | 3451 | btrfs_set_path_blocking(path); |
39279cc3 | 3452 | ret = btrfs_free_extent(trans, root, extent_start, |
5d4f98a2 YZ |
3453 | extent_num_bytes, 0, |
3454 | btrfs_header_owner(leaf), | |
66d7e7f0 | 3455 | ino, extent_offset, 0); |
39279cc3 CM |
3456 | BUG_ON(ret); |
3457 | } | |
85e21bac | 3458 | |
8082510e YZ |
3459 | if (found_type == BTRFS_INODE_ITEM_KEY) |
3460 | break; | |
3461 | ||
3462 | if (path->slots[0] == 0 || | |
3463 | path->slots[0] != pending_del_slot) { | |
8082510e YZ |
3464 | if (pending_del_nr) { |
3465 | ret = btrfs_del_items(trans, root, path, | |
3466 | pending_del_slot, | |
3467 | pending_del_nr); | |
79787eaa JM |
3468 | if (ret) { |
3469 | btrfs_abort_transaction(trans, | |
3470 | root, ret); | |
3471 | goto error; | |
3472 | } | |
8082510e YZ |
3473 | pending_del_nr = 0; |
3474 | } | |
b3b4aa74 | 3475 | btrfs_release_path(path); |
85e21bac | 3476 | goto search_again; |
8082510e YZ |
3477 | } else { |
3478 | path->slots[0]--; | |
85e21bac | 3479 | } |
39279cc3 | 3480 | } |
8082510e | 3481 | out: |
85e21bac CM |
3482 | if (pending_del_nr) { |
3483 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
3484 | pending_del_nr); | |
79787eaa JM |
3485 | if (ret) |
3486 | btrfs_abort_transaction(trans, root, ret); | |
85e21bac | 3487 | } |
79787eaa | 3488 | error: |
39279cc3 | 3489 | btrfs_free_path(path); |
8082510e | 3490 | return err; |
39279cc3 CM |
3491 | } |
3492 | ||
3493 | /* | |
2aaa6655 JB |
3494 | * btrfs_truncate_page - read, zero a chunk and write a page |
3495 | * @inode - inode that we're zeroing | |
3496 | * @from - the offset to start zeroing | |
3497 | * @len - the length to zero, 0 to zero the entire range respective to the | |
3498 | * offset | |
3499 | * @front - zero up to the offset instead of from the offset on | |
3500 | * | |
3501 | * This will find the page for the "from" offset and cow the page and zero the | |
3502 | * part we want to zero. This is used with truncate and hole punching. | |
39279cc3 | 3503 | */ |
2aaa6655 JB |
3504 | int btrfs_truncate_page(struct inode *inode, loff_t from, loff_t len, |
3505 | int front) | |
39279cc3 | 3506 | { |
2aaa6655 | 3507 | struct address_space *mapping = inode->i_mapping; |
db94535d | 3508 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
3509 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
3510 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 3511 | struct extent_state *cached_state = NULL; |
e6dcd2dc | 3512 | char *kaddr; |
db94535d | 3513 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
3514 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
3515 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
3516 | struct page *page; | |
3b16a4e3 | 3517 | gfp_t mask = btrfs_alloc_write_mask(mapping); |
39279cc3 | 3518 | int ret = 0; |
a52d9a80 | 3519 | u64 page_start; |
e6dcd2dc | 3520 | u64 page_end; |
39279cc3 | 3521 | |
2aaa6655 JB |
3522 | if ((offset & (blocksize - 1)) == 0 && |
3523 | (!len || ((len & (blocksize - 1)) == 0))) | |
39279cc3 | 3524 | goto out; |
0ca1f7ce | 3525 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
5d5e103a JB |
3526 | if (ret) |
3527 | goto out; | |
39279cc3 | 3528 | |
211c17f5 | 3529 | again: |
3b16a4e3 | 3530 | page = find_or_create_page(mapping, index, mask); |
5d5e103a | 3531 | if (!page) { |
0ca1f7ce | 3532 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
ac6a2b36 | 3533 | ret = -ENOMEM; |
39279cc3 | 3534 | goto out; |
5d5e103a | 3535 | } |
e6dcd2dc CM |
3536 | |
3537 | page_start = page_offset(page); | |
3538 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
3539 | ||
39279cc3 | 3540 | if (!PageUptodate(page)) { |
9ebefb18 | 3541 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 3542 | lock_page(page); |
211c17f5 CM |
3543 | if (page->mapping != mapping) { |
3544 | unlock_page(page); | |
3545 | page_cache_release(page); | |
3546 | goto again; | |
3547 | } | |
39279cc3 CM |
3548 | if (!PageUptodate(page)) { |
3549 | ret = -EIO; | |
89642229 | 3550 | goto out_unlock; |
39279cc3 CM |
3551 | } |
3552 | } | |
211c17f5 | 3553 | wait_on_page_writeback(page); |
e6dcd2dc | 3554 | |
d0082371 | 3555 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state); |
e6dcd2dc CM |
3556 | set_page_extent_mapped(page); |
3557 | ||
3558 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
3559 | if (ordered) { | |
2ac55d41 JB |
3560 | unlock_extent_cached(io_tree, page_start, page_end, |
3561 | &cached_state, GFP_NOFS); | |
e6dcd2dc CM |
3562 | unlock_page(page); |
3563 | page_cache_release(page); | |
eb84ae03 | 3564 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
3565 | btrfs_put_ordered_extent(ordered); |
3566 | goto again; | |
3567 | } | |
3568 | ||
2ac55d41 | 3569 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
3570 | EXTENT_DIRTY | EXTENT_DELALLOC | |
3571 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 3572 | 0, 0, &cached_state, GFP_NOFS); |
5d5e103a | 3573 | |
2ac55d41 JB |
3574 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
3575 | &cached_state); | |
9ed74f2d | 3576 | if (ret) { |
2ac55d41 JB |
3577 | unlock_extent_cached(io_tree, page_start, page_end, |
3578 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
3579 | goto out_unlock; |
3580 | } | |
3581 | ||
e6dcd2dc | 3582 | if (offset != PAGE_CACHE_SIZE) { |
2aaa6655 JB |
3583 | if (!len) |
3584 | len = PAGE_CACHE_SIZE - offset; | |
e6dcd2dc | 3585 | kaddr = kmap(page); |
2aaa6655 JB |
3586 | if (front) |
3587 | memset(kaddr, 0, offset); | |
3588 | else | |
3589 | memset(kaddr + offset, 0, len); | |
e6dcd2dc CM |
3590 | flush_dcache_page(page); |
3591 | kunmap(page); | |
3592 | } | |
247e743c | 3593 | ClearPageChecked(page); |
e6dcd2dc | 3594 | set_page_dirty(page); |
2ac55d41 JB |
3595 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, |
3596 | GFP_NOFS); | |
39279cc3 | 3597 | |
89642229 | 3598 | out_unlock: |
5d5e103a | 3599 | if (ret) |
0ca1f7ce | 3600 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
39279cc3 CM |
3601 | unlock_page(page); |
3602 | page_cache_release(page); | |
3603 | out: | |
3604 | return ret; | |
3605 | } | |
3606 | ||
695a0d0d JB |
3607 | /* |
3608 | * This function puts in dummy file extents for the area we're creating a hole | |
3609 | * for. So if we are truncating this file to a larger size we need to insert | |
3610 | * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for | |
3611 | * the range between oldsize and size | |
3612 | */ | |
a41ad394 | 3613 | int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size) |
39279cc3 | 3614 | { |
9036c102 YZ |
3615 | struct btrfs_trans_handle *trans; |
3616 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3617 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
a22285a6 | 3618 | struct extent_map *em = NULL; |
2ac55d41 | 3619 | struct extent_state *cached_state = NULL; |
5dc562c5 | 3620 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
9036c102 | 3621 | u64 mask = root->sectorsize - 1; |
a41ad394 | 3622 | u64 hole_start = (oldsize + mask) & ~mask; |
9036c102 YZ |
3623 | u64 block_end = (size + mask) & ~mask; |
3624 | u64 last_byte; | |
3625 | u64 cur_offset; | |
3626 | u64 hole_size; | |
9ed74f2d | 3627 | int err = 0; |
39279cc3 | 3628 | |
9036c102 YZ |
3629 | if (size <= hole_start) |
3630 | return 0; | |
3631 | ||
9036c102 YZ |
3632 | while (1) { |
3633 | struct btrfs_ordered_extent *ordered; | |
3634 | btrfs_wait_ordered_range(inode, hole_start, | |
3635 | block_end - hole_start); | |
2ac55d41 | 3636 | lock_extent_bits(io_tree, hole_start, block_end - 1, 0, |
d0082371 | 3637 | &cached_state); |
9036c102 YZ |
3638 | ordered = btrfs_lookup_ordered_extent(inode, hole_start); |
3639 | if (!ordered) | |
3640 | break; | |
2ac55d41 JB |
3641 | unlock_extent_cached(io_tree, hole_start, block_end - 1, |
3642 | &cached_state, GFP_NOFS); | |
9036c102 YZ |
3643 | btrfs_put_ordered_extent(ordered); |
3644 | } | |
39279cc3 | 3645 | |
9036c102 YZ |
3646 | cur_offset = hole_start; |
3647 | while (1) { | |
3648 | em = btrfs_get_extent(inode, NULL, 0, cur_offset, | |
3649 | block_end - cur_offset, 0); | |
79787eaa JM |
3650 | if (IS_ERR(em)) { |
3651 | err = PTR_ERR(em); | |
3652 | break; | |
3653 | } | |
9036c102 YZ |
3654 | last_byte = min(extent_map_end(em), block_end); |
3655 | last_byte = (last_byte + mask) & ~mask; | |
8082510e | 3656 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
5dc562c5 | 3657 | struct extent_map *hole_em; |
9036c102 | 3658 | hole_size = last_byte - cur_offset; |
9ed74f2d | 3659 | |
3642320e | 3660 | trans = btrfs_start_transaction(root, 3); |
a22285a6 YZ |
3661 | if (IS_ERR(trans)) { |
3662 | err = PTR_ERR(trans); | |
9ed74f2d | 3663 | break; |
a22285a6 | 3664 | } |
8082510e | 3665 | |
5dc562c5 JB |
3666 | err = btrfs_drop_extents(trans, root, inode, |
3667 | cur_offset, | |
2671485d | 3668 | cur_offset + hole_size, 1); |
5b397377 | 3669 | if (err) { |
79787eaa | 3670 | btrfs_abort_transaction(trans, root, err); |
5b397377 | 3671 | btrfs_end_transaction(trans, root); |
3893e33b | 3672 | break; |
5b397377 | 3673 | } |
8082510e | 3674 | |
9036c102 | 3675 | err = btrfs_insert_file_extent(trans, root, |
33345d01 | 3676 | btrfs_ino(inode), cur_offset, 0, |
9036c102 YZ |
3677 | 0, hole_size, 0, hole_size, |
3678 | 0, 0, 0); | |
5b397377 | 3679 | if (err) { |
79787eaa | 3680 | btrfs_abort_transaction(trans, root, err); |
5b397377 | 3681 | btrfs_end_transaction(trans, root); |
3893e33b | 3682 | break; |
5b397377 | 3683 | } |
8082510e | 3684 | |
5dc562c5 JB |
3685 | btrfs_drop_extent_cache(inode, cur_offset, |
3686 | cur_offset + hole_size - 1, 0); | |
3687 | hole_em = alloc_extent_map(); | |
3688 | if (!hole_em) { | |
3689 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3690 | &BTRFS_I(inode)->runtime_flags); | |
3691 | goto next; | |
3692 | } | |
3693 | hole_em->start = cur_offset; | |
3694 | hole_em->len = hole_size; | |
3695 | hole_em->orig_start = cur_offset; | |
8082510e | 3696 | |
5dc562c5 JB |
3697 | hole_em->block_start = EXTENT_MAP_HOLE; |
3698 | hole_em->block_len = 0; | |
3699 | hole_em->bdev = root->fs_info->fs_devices->latest_bdev; | |
3700 | hole_em->compress_type = BTRFS_COMPRESS_NONE; | |
3701 | hole_em->generation = trans->transid; | |
8082510e | 3702 | |
5dc562c5 JB |
3703 | while (1) { |
3704 | write_lock(&em_tree->lock); | |
3705 | err = add_extent_mapping(em_tree, hole_em); | |
3706 | if (!err) | |
3707 | list_move(&hole_em->list, | |
3708 | &em_tree->modified_extents); | |
3709 | write_unlock(&em_tree->lock); | |
3710 | if (err != -EEXIST) | |
3711 | break; | |
3712 | btrfs_drop_extent_cache(inode, cur_offset, | |
3713 | cur_offset + | |
3714 | hole_size - 1, 0); | |
3715 | } | |
3716 | free_extent_map(hole_em); | |
3717 | next: | |
3642320e | 3718 | btrfs_update_inode(trans, root, inode); |
8082510e | 3719 | btrfs_end_transaction(trans, root); |
9036c102 YZ |
3720 | } |
3721 | free_extent_map(em); | |
a22285a6 | 3722 | em = NULL; |
9036c102 | 3723 | cur_offset = last_byte; |
8082510e | 3724 | if (cur_offset >= block_end) |
9036c102 YZ |
3725 | break; |
3726 | } | |
1832a6d5 | 3727 | |
a22285a6 | 3728 | free_extent_map(em); |
2ac55d41 JB |
3729 | unlock_extent_cached(io_tree, hole_start, block_end - 1, &cached_state, |
3730 | GFP_NOFS); | |
9036c102 YZ |
3731 | return err; |
3732 | } | |
39279cc3 | 3733 | |
a41ad394 | 3734 | static int btrfs_setsize(struct inode *inode, loff_t newsize) |
8082510e | 3735 | { |
f4a2f4c5 MX |
3736 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3737 | struct btrfs_trans_handle *trans; | |
a41ad394 | 3738 | loff_t oldsize = i_size_read(inode); |
8082510e YZ |
3739 | int ret; |
3740 | ||
a41ad394 | 3741 | if (newsize == oldsize) |
8082510e YZ |
3742 | return 0; |
3743 | ||
a41ad394 | 3744 | if (newsize > oldsize) { |
a41ad394 JB |
3745 | truncate_pagecache(inode, oldsize, newsize); |
3746 | ret = btrfs_cont_expand(inode, oldsize, newsize); | |
f4a2f4c5 | 3747 | if (ret) |
8082510e | 3748 | return ret; |
8082510e | 3749 | |
f4a2f4c5 MX |
3750 | trans = btrfs_start_transaction(root, 1); |
3751 | if (IS_ERR(trans)) | |
3752 | return PTR_ERR(trans); | |
3753 | ||
3754 | i_size_write(inode, newsize); | |
3755 | btrfs_ordered_update_i_size(inode, i_size_read(inode), NULL); | |
3756 | ret = btrfs_update_inode(trans, root, inode); | |
7ad85bb7 | 3757 | btrfs_end_transaction(trans, root); |
a41ad394 | 3758 | } else { |
8082510e | 3759 | |
a41ad394 JB |
3760 | /* |
3761 | * We're truncating a file that used to have good data down to | |
3762 | * zero. Make sure it gets into the ordered flush list so that | |
3763 | * any new writes get down to disk quickly. | |
3764 | */ | |
3765 | if (newsize == 0) | |
72ac3c0d JB |
3766 | set_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
3767 | &BTRFS_I(inode)->runtime_flags); | |
8082510e | 3768 | |
a41ad394 JB |
3769 | /* we don't support swapfiles, so vmtruncate shouldn't fail */ |
3770 | truncate_setsize(inode, newsize); | |
3771 | ret = btrfs_truncate(inode); | |
8082510e YZ |
3772 | } |
3773 | ||
a41ad394 | 3774 | return ret; |
8082510e YZ |
3775 | } |
3776 | ||
9036c102 YZ |
3777 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) |
3778 | { | |
3779 | struct inode *inode = dentry->d_inode; | |
b83cc969 | 3780 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9036c102 | 3781 | int err; |
39279cc3 | 3782 | |
b83cc969 LZ |
3783 | if (btrfs_root_readonly(root)) |
3784 | return -EROFS; | |
3785 | ||
9036c102 YZ |
3786 | err = inode_change_ok(inode, attr); |
3787 | if (err) | |
3788 | return err; | |
2bf5a725 | 3789 | |
5a3f23d5 | 3790 | if (S_ISREG(inode->i_mode) && (attr->ia_valid & ATTR_SIZE)) { |
a41ad394 | 3791 | err = btrfs_setsize(inode, attr->ia_size); |
8082510e YZ |
3792 | if (err) |
3793 | return err; | |
39279cc3 | 3794 | } |
9036c102 | 3795 | |
1025774c CH |
3796 | if (attr->ia_valid) { |
3797 | setattr_copy(inode, attr); | |
0c4d2d95 | 3798 | inode_inc_iversion(inode); |
22c44fe6 | 3799 | err = btrfs_dirty_inode(inode); |
1025774c | 3800 | |
22c44fe6 | 3801 | if (!err && attr->ia_valid & ATTR_MODE) |
1025774c CH |
3802 | err = btrfs_acl_chmod(inode); |
3803 | } | |
33268eaf | 3804 | |
39279cc3 CM |
3805 | return err; |
3806 | } | |
61295eb8 | 3807 | |
bd555975 | 3808 | void btrfs_evict_inode(struct inode *inode) |
39279cc3 CM |
3809 | { |
3810 | struct btrfs_trans_handle *trans; | |
3811 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
726c35fa | 3812 | struct btrfs_block_rsv *rsv, *global_rsv; |
07127184 | 3813 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 CM |
3814 | int ret; |
3815 | ||
1abe9b8a | 3816 | trace_btrfs_inode_evict(inode); |
3817 | ||
39279cc3 | 3818 | truncate_inode_pages(&inode->i_data, 0); |
0af3d00b | 3819 | if (inode->i_nlink && (btrfs_root_refs(&root->root_item) != 0 || |
83eea1f1 | 3820 | btrfs_is_free_space_inode(inode))) |
bd555975 AV |
3821 | goto no_delete; |
3822 | ||
39279cc3 | 3823 | if (is_bad_inode(inode)) { |
7b128766 | 3824 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
3825 | goto no_delete; |
3826 | } | |
bd555975 | 3827 | /* do we really want it for ->i_nlink > 0 and zero btrfs_root_refs? */ |
4a096752 | 3828 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
5f39d397 | 3829 | |
c71bf099 | 3830 | if (root->fs_info->log_root_recovering) { |
6bf02314 | 3831 | BUG_ON(test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
8a35d95f | 3832 | &BTRFS_I(inode)->runtime_flags)); |
c71bf099 YZ |
3833 | goto no_delete; |
3834 | } | |
3835 | ||
76dda93c YZ |
3836 | if (inode->i_nlink > 0) { |
3837 | BUG_ON(btrfs_root_refs(&root->root_item) != 0); | |
3838 | goto no_delete; | |
3839 | } | |
3840 | ||
66d8f3dd | 3841 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
4289a667 JB |
3842 | if (!rsv) { |
3843 | btrfs_orphan_del(NULL, inode); | |
3844 | goto no_delete; | |
3845 | } | |
4a338542 | 3846 | rsv->size = min_size; |
ca7e70f5 | 3847 | rsv->failfast = 1; |
726c35fa | 3848 | global_rsv = &root->fs_info->global_block_rsv; |
4289a667 | 3849 | |
dbe674a9 | 3850 | btrfs_i_size_write(inode, 0); |
5f39d397 | 3851 | |
4289a667 | 3852 | /* |
8407aa46 MX |
3853 | * This is a bit simpler than btrfs_truncate since we've already |
3854 | * reserved our space for our orphan item in the unlink, so we just | |
3855 | * need to reserve some slack space in case we add bytes and update | |
3856 | * inode item when doing the truncate. | |
4289a667 | 3857 | */ |
8082510e | 3858 | while (1) { |
08e007d2 MX |
3859 | ret = btrfs_block_rsv_refill(root, rsv, min_size, |
3860 | BTRFS_RESERVE_FLUSH_LIMIT); | |
726c35fa JB |
3861 | |
3862 | /* | |
3863 | * Try and steal from the global reserve since we will | |
3864 | * likely not use this space anyway, we want to try as | |
3865 | * hard as possible to get this to work. | |
3866 | */ | |
3867 | if (ret) | |
3868 | ret = btrfs_block_rsv_migrate(global_rsv, rsv, min_size); | |
d68fc57b | 3869 | |
d68fc57b | 3870 | if (ret) { |
4289a667 | 3871 | printk(KERN_WARNING "Could not get space for a " |
482e6dc5 | 3872 | "delete, will truncate on mount %d\n", ret); |
4289a667 JB |
3873 | btrfs_orphan_del(NULL, inode); |
3874 | btrfs_free_block_rsv(root, rsv); | |
3875 | goto no_delete; | |
d68fc57b | 3876 | } |
7b128766 | 3877 | |
08e007d2 | 3878 | trans = btrfs_start_transaction_lflush(root, 1); |
4289a667 JB |
3879 | if (IS_ERR(trans)) { |
3880 | btrfs_orphan_del(NULL, inode); | |
3881 | btrfs_free_block_rsv(root, rsv); | |
3882 | goto no_delete; | |
d68fc57b | 3883 | } |
7b128766 | 3884 | |
4289a667 JB |
3885 | trans->block_rsv = rsv; |
3886 | ||
d68fc57b | 3887 | ret = btrfs_truncate_inode_items(trans, root, inode, 0, 0); |
ca7e70f5 | 3888 | if (ret != -ENOSPC) |
8082510e | 3889 | break; |
85e21bac | 3890 | |
8407aa46 MX |
3891 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
3892 | ret = btrfs_update_inode(trans, root, inode); | |
3893 | BUG_ON(ret); | |
3894 | ||
8082510e YZ |
3895 | btrfs_end_transaction(trans, root); |
3896 | trans = NULL; | |
b53d3f5d | 3897 | btrfs_btree_balance_dirty(root); |
8082510e | 3898 | } |
5f39d397 | 3899 | |
4289a667 JB |
3900 | btrfs_free_block_rsv(root, rsv); |
3901 | ||
8082510e | 3902 | if (ret == 0) { |
4289a667 | 3903 | trans->block_rsv = root->orphan_block_rsv; |
8082510e YZ |
3904 | ret = btrfs_orphan_del(trans, inode); |
3905 | BUG_ON(ret); | |
3906 | } | |
54aa1f4d | 3907 | |
4289a667 | 3908 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
581bb050 LZ |
3909 | if (!(root == root->fs_info->tree_root || |
3910 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID)) | |
33345d01 | 3911 | btrfs_return_ino(root, btrfs_ino(inode)); |
581bb050 | 3912 | |
54aa1f4d | 3913 | btrfs_end_transaction(trans, root); |
b53d3f5d | 3914 | btrfs_btree_balance_dirty(root); |
39279cc3 | 3915 | no_delete: |
dbd5768f | 3916 | clear_inode(inode); |
8082510e | 3917 | return; |
39279cc3 CM |
3918 | } |
3919 | ||
3920 | /* | |
3921 | * this returns the key found in the dir entry in the location pointer. | |
3922 | * If no dir entries were found, location->objectid is 0. | |
3923 | */ | |
3924 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
3925 | struct btrfs_key *location) | |
3926 | { | |
3927 | const char *name = dentry->d_name.name; | |
3928 | int namelen = dentry->d_name.len; | |
3929 | struct btrfs_dir_item *di; | |
3930 | struct btrfs_path *path; | |
3931 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 3932 | int ret = 0; |
39279cc3 CM |
3933 | |
3934 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
3935 | if (!path) |
3936 | return -ENOMEM; | |
3954401f | 3937 | |
33345d01 | 3938 | di = btrfs_lookup_dir_item(NULL, root, path, btrfs_ino(dir), name, |
39279cc3 | 3939 | namelen, 0); |
0d9f7f3e Y |
3940 | if (IS_ERR(di)) |
3941 | ret = PTR_ERR(di); | |
d397712b | 3942 | |
c704005d | 3943 | if (IS_ERR_OR_NULL(di)) |
3954401f | 3944 | goto out_err; |
d397712b | 3945 | |
5f39d397 | 3946 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 3947 | out: |
39279cc3 CM |
3948 | btrfs_free_path(path); |
3949 | return ret; | |
3954401f CM |
3950 | out_err: |
3951 | location->objectid = 0; | |
3952 | goto out; | |
39279cc3 CM |
3953 | } |
3954 | ||
3955 | /* | |
3956 | * when we hit a tree root in a directory, the btrfs part of the inode | |
3957 | * needs to be changed to reflect the root directory of the tree root. This | |
3958 | * is kind of like crossing a mount point. | |
3959 | */ | |
3960 | static int fixup_tree_root_location(struct btrfs_root *root, | |
4df27c4d YZ |
3961 | struct inode *dir, |
3962 | struct dentry *dentry, | |
3963 | struct btrfs_key *location, | |
3964 | struct btrfs_root **sub_root) | |
39279cc3 | 3965 | { |
4df27c4d YZ |
3966 | struct btrfs_path *path; |
3967 | struct btrfs_root *new_root; | |
3968 | struct btrfs_root_ref *ref; | |
3969 | struct extent_buffer *leaf; | |
3970 | int ret; | |
3971 | int err = 0; | |
39279cc3 | 3972 | |
4df27c4d YZ |
3973 | path = btrfs_alloc_path(); |
3974 | if (!path) { | |
3975 | err = -ENOMEM; | |
3976 | goto out; | |
3977 | } | |
39279cc3 | 3978 | |
4df27c4d YZ |
3979 | err = -ENOENT; |
3980 | ret = btrfs_find_root_ref(root->fs_info->tree_root, path, | |
3981 | BTRFS_I(dir)->root->root_key.objectid, | |
3982 | location->objectid); | |
3983 | if (ret) { | |
3984 | if (ret < 0) | |
3985 | err = ret; | |
3986 | goto out; | |
3987 | } | |
39279cc3 | 3988 | |
4df27c4d YZ |
3989 | leaf = path->nodes[0]; |
3990 | ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref); | |
33345d01 | 3991 | if (btrfs_root_ref_dirid(leaf, ref) != btrfs_ino(dir) || |
4df27c4d YZ |
3992 | btrfs_root_ref_name_len(leaf, ref) != dentry->d_name.len) |
3993 | goto out; | |
39279cc3 | 3994 | |
4df27c4d YZ |
3995 | ret = memcmp_extent_buffer(leaf, dentry->d_name.name, |
3996 | (unsigned long)(ref + 1), | |
3997 | dentry->d_name.len); | |
3998 | if (ret) | |
3999 | goto out; | |
4000 | ||
b3b4aa74 | 4001 | btrfs_release_path(path); |
4df27c4d YZ |
4002 | |
4003 | new_root = btrfs_read_fs_root_no_name(root->fs_info, location); | |
4004 | if (IS_ERR(new_root)) { | |
4005 | err = PTR_ERR(new_root); | |
4006 | goto out; | |
4007 | } | |
4008 | ||
4009 | if (btrfs_root_refs(&new_root->root_item) == 0) { | |
4010 | err = -ENOENT; | |
4011 | goto out; | |
4012 | } | |
4013 | ||
4014 | *sub_root = new_root; | |
4015 | location->objectid = btrfs_root_dirid(&new_root->root_item); | |
4016 | location->type = BTRFS_INODE_ITEM_KEY; | |
4017 | location->offset = 0; | |
4018 | err = 0; | |
4019 | out: | |
4020 | btrfs_free_path(path); | |
4021 | return err; | |
39279cc3 CM |
4022 | } |
4023 | ||
5d4f98a2 YZ |
4024 | static void inode_tree_add(struct inode *inode) |
4025 | { | |
4026 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4027 | struct btrfs_inode *entry; | |
03e860bd FNP |
4028 | struct rb_node **p; |
4029 | struct rb_node *parent; | |
33345d01 | 4030 | u64 ino = btrfs_ino(inode); |
03e860bd FNP |
4031 | again: |
4032 | p = &root->inode_tree.rb_node; | |
4033 | parent = NULL; | |
5d4f98a2 | 4034 | |
1d3382cb | 4035 | if (inode_unhashed(inode)) |
76dda93c YZ |
4036 | return; |
4037 | ||
5d4f98a2 YZ |
4038 | spin_lock(&root->inode_lock); |
4039 | while (*p) { | |
4040 | parent = *p; | |
4041 | entry = rb_entry(parent, struct btrfs_inode, rb_node); | |
4042 | ||
33345d01 | 4043 | if (ino < btrfs_ino(&entry->vfs_inode)) |
03e860bd | 4044 | p = &parent->rb_left; |
33345d01 | 4045 | else if (ino > btrfs_ino(&entry->vfs_inode)) |
03e860bd | 4046 | p = &parent->rb_right; |
5d4f98a2 YZ |
4047 | else { |
4048 | WARN_ON(!(entry->vfs_inode.i_state & | |
a4ffdde6 | 4049 | (I_WILL_FREE | I_FREEING))); |
03e860bd FNP |
4050 | rb_erase(parent, &root->inode_tree); |
4051 | RB_CLEAR_NODE(parent); | |
4052 | spin_unlock(&root->inode_lock); | |
4053 | goto again; | |
5d4f98a2 YZ |
4054 | } |
4055 | } | |
4056 | rb_link_node(&BTRFS_I(inode)->rb_node, parent, p); | |
4057 | rb_insert_color(&BTRFS_I(inode)->rb_node, &root->inode_tree); | |
4058 | spin_unlock(&root->inode_lock); | |
4059 | } | |
4060 | ||
4061 | static void inode_tree_del(struct inode *inode) | |
4062 | { | |
4063 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
76dda93c | 4064 | int empty = 0; |
5d4f98a2 | 4065 | |
03e860bd | 4066 | spin_lock(&root->inode_lock); |
5d4f98a2 | 4067 | if (!RB_EMPTY_NODE(&BTRFS_I(inode)->rb_node)) { |
5d4f98a2 | 4068 | rb_erase(&BTRFS_I(inode)->rb_node, &root->inode_tree); |
5d4f98a2 | 4069 | RB_CLEAR_NODE(&BTRFS_I(inode)->rb_node); |
76dda93c | 4070 | empty = RB_EMPTY_ROOT(&root->inode_tree); |
5d4f98a2 | 4071 | } |
03e860bd | 4072 | spin_unlock(&root->inode_lock); |
76dda93c | 4073 | |
0af3d00b JB |
4074 | /* |
4075 | * Free space cache has inodes in the tree root, but the tree root has a | |
4076 | * root_refs of 0, so this could end up dropping the tree root as a | |
4077 | * snapshot, so we need the extra !root->fs_info->tree_root check to | |
4078 | * make sure we don't drop it. | |
4079 | */ | |
4080 | if (empty && btrfs_root_refs(&root->root_item) == 0 && | |
4081 | root != root->fs_info->tree_root) { | |
76dda93c YZ |
4082 | synchronize_srcu(&root->fs_info->subvol_srcu); |
4083 | spin_lock(&root->inode_lock); | |
4084 | empty = RB_EMPTY_ROOT(&root->inode_tree); | |
4085 | spin_unlock(&root->inode_lock); | |
4086 | if (empty) | |
4087 | btrfs_add_dead_root(root); | |
4088 | } | |
4089 | } | |
4090 | ||
143bede5 | 4091 | void btrfs_invalidate_inodes(struct btrfs_root *root) |
76dda93c YZ |
4092 | { |
4093 | struct rb_node *node; | |
4094 | struct rb_node *prev; | |
4095 | struct btrfs_inode *entry; | |
4096 | struct inode *inode; | |
4097 | u64 objectid = 0; | |
4098 | ||
4099 | WARN_ON(btrfs_root_refs(&root->root_item) != 0); | |
4100 | ||
4101 | spin_lock(&root->inode_lock); | |
4102 | again: | |
4103 | node = root->inode_tree.rb_node; | |
4104 | prev = NULL; | |
4105 | while (node) { | |
4106 | prev = node; | |
4107 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
4108 | ||
33345d01 | 4109 | if (objectid < btrfs_ino(&entry->vfs_inode)) |
76dda93c | 4110 | node = node->rb_left; |
33345d01 | 4111 | else if (objectid > btrfs_ino(&entry->vfs_inode)) |
76dda93c YZ |
4112 | node = node->rb_right; |
4113 | else | |
4114 | break; | |
4115 | } | |
4116 | if (!node) { | |
4117 | while (prev) { | |
4118 | entry = rb_entry(prev, struct btrfs_inode, rb_node); | |
33345d01 | 4119 | if (objectid <= btrfs_ino(&entry->vfs_inode)) { |
76dda93c YZ |
4120 | node = prev; |
4121 | break; | |
4122 | } | |
4123 | prev = rb_next(prev); | |
4124 | } | |
4125 | } | |
4126 | while (node) { | |
4127 | entry = rb_entry(node, struct btrfs_inode, rb_node); | |
33345d01 | 4128 | objectid = btrfs_ino(&entry->vfs_inode) + 1; |
76dda93c YZ |
4129 | inode = igrab(&entry->vfs_inode); |
4130 | if (inode) { | |
4131 | spin_unlock(&root->inode_lock); | |
4132 | if (atomic_read(&inode->i_count) > 1) | |
4133 | d_prune_aliases(inode); | |
4134 | /* | |
45321ac5 | 4135 | * btrfs_drop_inode will have it removed from |
76dda93c YZ |
4136 | * the inode cache when its usage count |
4137 | * hits zero. | |
4138 | */ | |
4139 | iput(inode); | |
4140 | cond_resched(); | |
4141 | spin_lock(&root->inode_lock); | |
4142 | goto again; | |
4143 | } | |
4144 | ||
4145 | if (cond_resched_lock(&root->inode_lock)) | |
4146 | goto again; | |
4147 | ||
4148 | node = rb_next(node); | |
4149 | } | |
4150 | spin_unlock(&root->inode_lock); | |
5d4f98a2 YZ |
4151 | } |
4152 | ||
e02119d5 CM |
4153 | static int btrfs_init_locked_inode(struct inode *inode, void *p) |
4154 | { | |
4155 | struct btrfs_iget_args *args = p; | |
4156 | inode->i_ino = args->ino; | |
e02119d5 | 4157 | BTRFS_I(inode)->root = args->root; |
39279cc3 CM |
4158 | return 0; |
4159 | } | |
4160 | ||
4161 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
4162 | { | |
4163 | struct btrfs_iget_args *args = opaque; | |
33345d01 | 4164 | return args->ino == btrfs_ino(inode) && |
d397712b | 4165 | args->root == BTRFS_I(inode)->root; |
39279cc3 CM |
4166 | } |
4167 | ||
5d4f98a2 YZ |
4168 | static struct inode *btrfs_iget_locked(struct super_block *s, |
4169 | u64 objectid, | |
4170 | struct btrfs_root *root) | |
39279cc3 CM |
4171 | { |
4172 | struct inode *inode; | |
4173 | struct btrfs_iget_args args; | |
4174 | args.ino = objectid; | |
4175 | args.root = root; | |
4176 | ||
4177 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
4178 | btrfs_init_locked_inode, | |
4179 | (void *)&args); | |
4180 | return inode; | |
4181 | } | |
4182 | ||
1a54ef8c BR |
4183 | /* Get an inode object given its location and corresponding root. |
4184 | * Returns in *is_new if the inode was read from disk | |
4185 | */ | |
4186 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, | |
73f73415 | 4187 | struct btrfs_root *root, int *new) |
1a54ef8c BR |
4188 | { |
4189 | struct inode *inode; | |
4190 | ||
4191 | inode = btrfs_iget_locked(s, location->objectid, root); | |
4192 | if (!inode) | |
5d4f98a2 | 4193 | return ERR_PTR(-ENOMEM); |
1a54ef8c BR |
4194 | |
4195 | if (inode->i_state & I_NEW) { | |
4196 | BTRFS_I(inode)->root = root; | |
4197 | memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); | |
4198 | btrfs_read_locked_inode(inode); | |
1748f843 MF |
4199 | if (!is_bad_inode(inode)) { |
4200 | inode_tree_add(inode); | |
4201 | unlock_new_inode(inode); | |
4202 | if (new) | |
4203 | *new = 1; | |
4204 | } else { | |
e0b6d65b ST |
4205 | unlock_new_inode(inode); |
4206 | iput(inode); | |
4207 | inode = ERR_PTR(-ESTALE); | |
1748f843 MF |
4208 | } |
4209 | } | |
4210 | ||
1a54ef8c BR |
4211 | return inode; |
4212 | } | |
4213 | ||
4df27c4d YZ |
4214 | static struct inode *new_simple_dir(struct super_block *s, |
4215 | struct btrfs_key *key, | |
4216 | struct btrfs_root *root) | |
4217 | { | |
4218 | struct inode *inode = new_inode(s); | |
4219 | ||
4220 | if (!inode) | |
4221 | return ERR_PTR(-ENOMEM); | |
4222 | ||
4df27c4d YZ |
4223 | BTRFS_I(inode)->root = root; |
4224 | memcpy(&BTRFS_I(inode)->location, key, sizeof(*key)); | |
72ac3c0d | 4225 | set_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags); |
4df27c4d YZ |
4226 | |
4227 | inode->i_ino = BTRFS_EMPTY_SUBVOL_DIR_OBJECTID; | |
848cce0d | 4228 | inode->i_op = &btrfs_dir_ro_inode_operations; |
4df27c4d YZ |
4229 | inode->i_fop = &simple_dir_operations; |
4230 | inode->i_mode = S_IFDIR | S_IRUGO | S_IWUSR | S_IXUGO; | |
4231 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
4232 | ||
4233 | return inode; | |
4234 | } | |
4235 | ||
3de4586c | 4236 | struct inode *btrfs_lookup_dentry(struct inode *dir, struct dentry *dentry) |
39279cc3 | 4237 | { |
d397712b | 4238 | struct inode *inode; |
4df27c4d | 4239 | struct btrfs_root *root = BTRFS_I(dir)->root; |
39279cc3 CM |
4240 | struct btrfs_root *sub_root = root; |
4241 | struct btrfs_key location; | |
76dda93c | 4242 | int index; |
b4aff1f8 | 4243 | int ret = 0; |
39279cc3 CM |
4244 | |
4245 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
4246 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 4247 | |
b4aff1f8 JB |
4248 | if (unlikely(d_need_lookup(dentry))) { |
4249 | memcpy(&location, dentry->d_fsdata, sizeof(struct btrfs_key)); | |
4250 | kfree(dentry->d_fsdata); | |
4251 | dentry->d_fsdata = NULL; | |
a66e7cc6 JB |
4252 | /* This thing is hashed, drop it for now */ |
4253 | d_drop(dentry); | |
b4aff1f8 JB |
4254 | } else { |
4255 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
4256 | } | |
5f39d397 | 4257 | |
39279cc3 CM |
4258 | if (ret < 0) |
4259 | return ERR_PTR(ret); | |
5f39d397 | 4260 | |
4df27c4d YZ |
4261 | if (location.objectid == 0) |
4262 | return NULL; | |
4263 | ||
4264 | if (location.type == BTRFS_INODE_ITEM_KEY) { | |
73f73415 | 4265 | inode = btrfs_iget(dir->i_sb, &location, root, NULL); |
4df27c4d YZ |
4266 | return inode; |
4267 | } | |
4268 | ||
4269 | BUG_ON(location.type != BTRFS_ROOT_ITEM_KEY); | |
4270 | ||
76dda93c | 4271 | index = srcu_read_lock(&root->fs_info->subvol_srcu); |
4df27c4d YZ |
4272 | ret = fixup_tree_root_location(root, dir, dentry, |
4273 | &location, &sub_root); | |
4274 | if (ret < 0) { | |
4275 | if (ret != -ENOENT) | |
4276 | inode = ERR_PTR(ret); | |
4277 | else | |
4278 | inode = new_simple_dir(dir->i_sb, &location, sub_root); | |
4279 | } else { | |
73f73415 | 4280 | inode = btrfs_iget(dir->i_sb, &location, sub_root, NULL); |
39279cc3 | 4281 | } |
76dda93c YZ |
4282 | srcu_read_unlock(&root->fs_info->subvol_srcu, index); |
4283 | ||
34d19bad | 4284 | if (!IS_ERR(inode) && root != sub_root) { |
c71bf099 YZ |
4285 | down_read(&root->fs_info->cleanup_work_sem); |
4286 | if (!(inode->i_sb->s_flags & MS_RDONLY)) | |
66b4ffd1 | 4287 | ret = btrfs_orphan_cleanup(sub_root); |
c71bf099 | 4288 | up_read(&root->fs_info->cleanup_work_sem); |
66b4ffd1 JB |
4289 | if (ret) |
4290 | inode = ERR_PTR(ret); | |
c71bf099 YZ |
4291 | } |
4292 | ||
3de4586c CM |
4293 | return inode; |
4294 | } | |
4295 | ||
fe15ce44 | 4296 | static int btrfs_dentry_delete(const struct dentry *dentry) |
76dda93c YZ |
4297 | { |
4298 | struct btrfs_root *root; | |
848cce0d | 4299 | struct inode *inode = dentry->d_inode; |
76dda93c | 4300 | |
848cce0d LZ |
4301 | if (!inode && !IS_ROOT(dentry)) |
4302 | inode = dentry->d_parent->d_inode; | |
76dda93c | 4303 | |
848cce0d LZ |
4304 | if (inode) { |
4305 | root = BTRFS_I(inode)->root; | |
efefb143 YZ |
4306 | if (btrfs_root_refs(&root->root_item) == 0) |
4307 | return 1; | |
848cce0d LZ |
4308 | |
4309 | if (btrfs_ino(inode) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) | |
4310 | return 1; | |
efefb143 | 4311 | } |
76dda93c YZ |
4312 | return 0; |
4313 | } | |
4314 | ||
b4aff1f8 JB |
4315 | static void btrfs_dentry_release(struct dentry *dentry) |
4316 | { | |
4317 | if (dentry->d_fsdata) | |
4318 | kfree(dentry->d_fsdata); | |
4319 | } | |
4320 | ||
3de4586c | 4321 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
00cd8dd3 | 4322 | unsigned int flags) |
3de4586c | 4323 | { |
a66e7cc6 JB |
4324 | struct dentry *ret; |
4325 | ||
4326 | ret = d_splice_alias(btrfs_lookup_dentry(dir, dentry), dentry); | |
4327 | if (unlikely(d_need_lookup(dentry))) { | |
4328 | spin_lock(&dentry->d_lock); | |
4329 | dentry->d_flags &= ~DCACHE_NEED_LOOKUP; | |
4330 | spin_unlock(&dentry->d_lock); | |
4331 | } | |
4332 | return ret; | |
39279cc3 CM |
4333 | } |
4334 | ||
16cdcec7 | 4335 | unsigned char btrfs_filetype_table[] = { |
39279cc3 CM |
4336 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK |
4337 | }; | |
4338 | ||
cbdf5a24 DW |
4339 | static int btrfs_real_readdir(struct file *filp, void *dirent, |
4340 | filldir_t filldir) | |
39279cc3 | 4341 | { |
6da6abae | 4342 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
4343 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4344 | struct btrfs_item *item; | |
4345 | struct btrfs_dir_item *di; | |
4346 | struct btrfs_key key; | |
5f39d397 | 4347 | struct btrfs_key found_key; |
39279cc3 | 4348 | struct btrfs_path *path; |
16cdcec7 MX |
4349 | struct list_head ins_list; |
4350 | struct list_head del_list; | |
39279cc3 | 4351 | int ret; |
5f39d397 | 4352 | struct extent_buffer *leaf; |
39279cc3 | 4353 | int slot; |
39279cc3 CM |
4354 | unsigned char d_type; |
4355 | int over = 0; | |
4356 | u32 di_cur; | |
4357 | u32 di_total; | |
4358 | u32 di_len; | |
4359 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
4360 | char tmp_name[32]; |
4361 | char *name_ptr; | |
4362 | int name_len; | |
16cdcec7 | 4363 | int is_curr = 0; /* filp->f_pos points to the current index? */ |
39279cc3 CM |
4364 | |
4365 | /* FIXME, use a real flag for deciding about the key type */ | |
4366 | if (root->fs_info->tree_root == root) | |
4367 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 4368 | |
3954401f CM |
4369 | /* special case for "." */ |
4370 | if (filp->f_pos == 0) { | |
3765fefa HS |
4371 | over = filldir(dirent, ".", 1, |
4372 | filp->f_pos, btrfs_ino(inode), DT_DIR); | |
3954401f CM |
4373 | if (over) |
4374 | return 0; | |
4375 | filp->f_pos = 1; | |
4376 | } | |
3954401f CM |
4377 | /* special case for .., just use the back ref */ |
4378 | if (filp->f_pos == 1) { | |
5ecc7e5d | 4379 | u64 pino = parent_ino(filp->f_path.dentry); |
3954401f | 4380 | over = filldir(dirent, "..", 2, |
3765fefa | 4381 | filp->f_pos, pino, DT_DIR); |
3954401f | 4382 | if (over) |
49593bfa | 4383 | return 0; |
3954401f CM |
4384 | filp->f_pos = 2; |
4385 | } | |
49593bfa | 4386 | path = btrfs_alloc_path(); |
16cdcec7 MX |
4387 | if (!path) |
4388 | return -ENOMEM; | |
ff5714cc | 4389 | |
026fd317 | 4390 | path->reada = 1; |
49593bfa | 4391 | |
16cdcec7 MX |
4392 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
4393 | INIT_LIST_HEAD(&ins_list); | |
4394 | INIT_LIST_HEAD(&del_list); | |
4395 | btrfs_get_delayed_items(inode, &ins_list, &del_list); | |
4396 | } | |
4397 | ||
39279cc3 CM |
4398 | btrfs_set_key_type(&key, key_type); |
4399 | key.offset = filp->f_pos; | |
33345d01 | 4400 | key.objectid = btrfs_ino(inode); |
5f39d397 | 4401 | |
39279cc3 CM |
4402 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
4403 | if (ret < 0) | |
4404 | goto err; | |
49593bfa DW |
4405 | |
4406 | while (1) { | |
5f39d397 | 4407 | leaf = path->nodes[0]; |
39279cc3 | 4408 | slot = path->slots[0]; |
b9e03af0 LZ |
4409 | if (slot >= btrfs_header_nritems(leaf)) { |
4410 | ret = btrfs_next_leaf(root, path); | |
4411 | if (ret < 0) | |
4412 | goto err; | |
4413 | else if (ret > 0) | |
4414 | break; | |
4415 | continue; | |
39279cc3 | 4416 | } |
3de4586c | 4417 | |
5f39d397 CM |
4418 | item = btrfs_item_nr(leaf, slot); |
4419 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
4420 | ||
4421 | if (found_key.objectid != key.objectid) | |
39279cc3 | 4422 | break; |
5f39d397 | 4423 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 4424 | break; |
5f39d397 | 4425 | if (found_key.offset < filp->f_pos) |
b9e03af0 | 4426 | goto next; |
16cdcec7 MX |
4427 | if (key_type == BTRFS_DIR_INDEX_KEY && |
4428 | btrfs_should_delete_dir_index(&del_list, | |
4429 | found_key.offset)) | |
4430 | goto next; | |
5f39d397 CM |
4431 | |
4432 | filp->f_pos = found_key.offset; | |
16cdcec7 | 4433 | is_curr = 1; |
49593bfa | 4434 | |
39279cc3 CM |
4435 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
4436 | di_cur = 0; | |
5f39d397 | 4437 | di_total = btrfs_item_size(leaf, item); |
49593bfa DW |
4438 | |
4439 | while (di_cur < di_total) { | |
5f39d397 CM |
4440 | struct btrfs_key location; |
4441 | ||
22a94d44 JB |
4442 | if (verify_dir_item(root, leaf, di)) |
4443 | break; | |
4444 | ||
5f39d397 | 4445 | name_len = btrfs_dir_name_len(leaf, di); |
49593bfa | 4446 | if (name_len <= sizeof(tmp_name)) { |
5f39d397 CM |
4447 | name_ptr = tmp_name; |
4448 | } else { | |
4449 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
49593bfa DW |
4450 | if (!name_ptr) { |
4451 | ret = -ENOMEM; | |
4452 | goto err; | |
4453 | } | |
5f39d397 CM |
4454 | } |
4455 | read_extent_buffer(leaf, name_ptr, | |
4456 | (unsigned long)(di + 1), name_len); | |
4457 | ||
4458 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
4459 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
3de4586c | 4460 | |
fede766f | 4461 | |
3de4586c | 4462 | /* is this a reference to our own snapshot? If so |
8c9c2bf7 AJ |
4463 | * skip it. |
4464 | * | |
4465 | * In contrast to old kernels, we insert the snapshot's | |
4466 | * dir item and dir index after it has been created, so | |
4467 | * we won't find a reference to our own snapshot. We | |
4468 | * still keep the following code for backward | |
4469 | * compatibility. | |
3de4586c CM |
4470 | */ |
4471 | if (location.type == BTRFS_ROOT_ITEM_KEY && | |
4472 | location.objectid == root->root_key.objectid) { | |
4473 | over = 0; | |
4474 | goto skip; | |
4475 | } | |
5f39d397 | 4476 | over = filldir(dirent, name_ptr, name_len, |
49593bfa | 4477 | found_key.offset, location.objectid, |
39279cc3 | 4478 | d_type); |
5f39d397 | 4479 | |
3de4586c | 4480 | skip: |
5f39d397 CM |
4481 | if (name_ptr != tmp_name) |
4482 | kfree(name_ptr); | |
4483 | ||
39279cc3 CM |
4484 | if (over) |
4485 | goto nopos; | |
5103e947 | 4486 | di_len = btrfs_dir_name_len(leaf, di) + |
49593bfa | 4487 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
4488 | di_cur += di_len; |
4489 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
4490 | } | |
b9e03af0 LZ |
4491 | next: |
4492 | path->slots[0]++; | |
39279cc3 | 4493 | } |
49593bfa | 4494 | |
16cdcec7 MX |
4495 | if (key_type == BTRFS_DIR_INDEX_KEY) { |
4496 | if (is_curr) | |
4497 | filp->f_pos++; | |
4498 | ret = btrfs_readdir_delayed_dir_index(filp, dirent, filldir, | |
4499 | &ins_list); | |
4500 | if (ret) | |
4501 | goto nopos; | |
4502 | } | |
4503 | ||
49593bfa | 4504 | /* Reached end of directory/root. Bump pos past the last item. */ |
5e591a07 | 4505 | if (key_type == BTRFS_DIR_INDEX_KEY) |
406266ab JE |
4506 | /* |
4507 | * 32-bit glibc will use getdents64, but then strtol - | |
4508 | * so the last number we can serve is this. | |
4509 | */ | |
4510 | filp->f_pos = 0x7fffffff; | |
5e591a07 YZ |
4511 | else |
4512 | filp->f_pos++; | |
39279cc3 CM |
4513 | nopos: |
4514 | ret = 0; | |
4515 | err: | |
16cdcec7 MX |
4516 | if (key_type == BTRFS_DIR_INDEX_KEY) |
4517 | btrfs_put_delayed_items(&ins_list, &del_list); | |
39279cc3 | 4518 | btrfs_free_path(path); |
39279cc3 CM |
4519 | return ret; |
4520 | } | |
4521 | ||
a9185b41 | 4522 | int btrfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
39279cc3 CM |
4523 | { |
4524 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4525 | struct btrfs_trans_handle *trans; | |
4526 | int ret = 0; | |
0af3d00b | 4527 | bool nolock = false; |
39279cc3 | 4528 | |
72ac3c0d | 4529 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
4ca8b41e CM |
4530 | return 0; |
4531 | ||
83eea1f1 | 4532 | if (btrfs_fs_closing(root->fs_info) && btrfs_is_free_space_inode(inode)) |
82d5902d | 4533 | nolock = true; |
0af3d00b | 4534 | |
a9185b41 | 4535 | if (wbc->sync_mode == WB_SYNC_ALL) { |
0af3d00b | 4536 | if (nolock) |
7a7eaa40 | 4537 | trans = btrfs_join_transaction_nolock(root); |
0af3d00b | 4538 | else |
7a7eaa40 | 4539 | trans = btrfs_join_transaction(root); |
3612b495 TI |
4540 | if (IS_ERR(trans)) |
4541 | return PTR_ERR(trans); | |
a698d075 | 4542 | ret = btrfs_commit_transaction(trans, root); |
39279cc3 CM |
4543 | } |
4544 | return ret; | |
4545 | } | |
4546 | ||
4547 | /* | |
54aa1f4d | 4548 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
4549 | * inode changes. But, it is most likely to find the inode in cache. |
4550 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
4551 | * to keep or drop this code. | |
4552 | */ | |
22c44fe6 | 4553 | int btrfs_dirty_inode(struct inode *inode) |
39279cc3 CM |
4554 | { |
4555 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4556 | struct btrfs_trans_handle *trans; | |
8929ecfa YZ |
4557 | int ret; |
4558 | ||
72ac3c0d | 4559 | if (test_bit(BTRFS_INODE_DUMMY, &BTRFS_I(inode)->runtime_flags)) |
22c44fe6 | 4560 | return 0; |
39279cc3 | 4561 | |
7a7eaa40 | 4562 | trans = btrfs_join_transaction(root); |
22c44fe6 JB |
4563 | if (IS_ERR(trans)) |
4564 | return PTR_ERR(trans); | |
8929ecfa YZ |
4565 | |
4566 | ret = btrfs_update_inode(trans, root, inode); | |
94b60442 CM |
4567 | if (ret && ret == -ENOSPC) { |
4568 | /* whoops, lets try again with the full transaction */ | |
4569 | btrfs_end_transaction(trans, root); | |
4570 | trans = btrfs_start_transaction(root, 1); | |
22c44fe6 JB |
4571 | if (IS_ERR(trans)) |
4572 | return PTR_ERR(trans); | |
8929ecfa | 4573 | |
94b60442 | 4574 | ret = btrfs_update_inode(trans, root, inode); |
94b60442 | 4575 | } |
39279cc3 | 4576 | btrfs_end_transaction(trans, root); |
16cdcec7 MX |
4577 | if (BTRFS_I(inode)->delayed_node) |
4578 | btrfs_balance_delayed_items(root); | |
22c44fe6 JB |
4579 | |
4580 | return ret; | |
4581 | } | |
4582 | ||
4583 | /* | |
4584 | * This is a copy of file_update_time. We need this so we can return error on | |
4585 | * ENOSPC for updating the inode in the case of file write and mmap writes. | |
4586 | */ | |
e41f941a JB |
4587 | static int btrfs_update_time(struct inode *inode, struct timespec *now, |
4588 | int flags) | |
22c44fe6 | 4589 | { |
2bc55652 AB |
4590 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4591 | ||
4592 | if (btrfs_root_readonly(root)) | |
4593 | return -EROFS; | |
4594 | ||
e41f941a | 4595 | if (flags & S_VERSION) |
22c44fe6 | 4596 | inode_inc_iversion(inode); |
e41f941a JB |
4597 | if (flags & S_CTIME) |
4598 | inode->i_ctime = *now; | |
4599 | if (flags & S_MTIME) | |
4600 | inode->i_mtime = *now; | |
4601 | if (flags & S_ATIME) | |
4602 | inode->i_atime = *now; | |
4603 | return btrfs_dirty_inode(inode); | |
39279cc3 CM |
4604 | } |
4605 | ||
d352ac68 CM |
4606 | /* |
4607 | * find the highest existing sequence number in a directory | |
4608 | * and then set the in-memory index_cnt variable to reflect | |
4609 | * free sequence numbers | |
4610 | */ | |
aec7477b JB |
4611 | static int btrfs_set_inode_index_count(struct inode *inode) |
4612 | { | |
4613 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4614 | struct btrfs_key key, found_key; | |
4615 | struct btrfs_path *path; | |
4616 | struct extent_buffer *leaf; | |
4617 | int ret; | |
4618 | ||
33345d01 | 4619 | key.objectid = btrfs_ino(inode); |
aec7477b JB |
4620 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); |
4621 | key.offset = (u64)-1; | |
4622 | ||
4623 | path = btrfs_alloc_path(); | |
4624 | if (!path) | |
4625 | return -ENOMEM; | |
4626 | ||
4627 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
4628 | if (ret < 0) | |
4629 | goto out; | |
4630 | /* FIXME: we should be able to handle this */ | |
4631 | if (ret == 0) | |
4632 | goto out; | |
4633 | ret = 0; | |
4634 | ||
4635 | /* | |
4636 | * MAGIC NUMBER EXPLANATION: | |
4637 | * since we search a directory based on f_pos we have to start at 2 | |
4638 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
4639 | * else has to start at 2 | |
4640 | */ | |
4641 | if (path->slots[0] == 0) { | |
4642 | BTRFS_I(inode)->index_cnt = 2; | |
4643 | goto out; | |
4644 | } | |
4645 | ||
4646 | path->slots[0]--; | |
4647 | ||
4648 | leaf = path->nodes[0]; | |
4649 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
4650 | ||
33345d01 | 4651 | if (found_key.objectid != btrfs_ino(inode) || |
aec7477b JB |
4652 | btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) { |
4653 | BTRFS_I(inode)->index_cnt = 2; | |
4654 | goto out; | |
4655 | } | |
4656 | ||
4657 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
4658 | out: | |
4659 | btrfs_free_path(path); | |
4660 | return ret; | |
4661 | } | |
4662 | ||
d352ac68 CM |
4663 | /* |
4664 | * helper to find a free sequence number in a given directory. This current | |
4665 | * code is very simple, later versions will do smarter things in the btree | |
4666 | */ | |
3de4586c | 4667 | int btrfs_set_inode_index(struct inode *dir, u64 *index) |
aec7477b JB |
4668 | { |
4669 | int ret = 0; | |
4670 | ||
4671 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
16cdcec7 MX |
4672 | ret = btrfs_inode_delayed_dir_index_count(dir); |
4673 | if (ret) { | |
4674 | ret = btrfs_set_inode_index_count(dir); | |
4675 | if (ret) | |
4676 | return ret; | |
4677 | } | |
aec7477b JB |
4678 | } |
4679 | ||
00e4e6b3 | 4680 | *index = BTRFS_I(dir)->index_cnt; |
aec7477b JB |
4681 | BTRFS_I(dir)->index_cnt++; |
4682 | ||
4683 | return ret; | |
4684 | } | |
4685 | ||
39279cc3 CM |
4686 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
4687 | struct btrfs_root *root, | |
aec7477b | 4688 | struct inode *dir, |
9c58309d | 4689 | const char *name, int name_len, |
175a4eb7 AV |
4690 | u64 ref_objectid, u64 objectid, |
4691 | umode_t mode, u64 *index) | |
39279cc3 CM |
4692 | { |
4693 | struct inode *inode; | |
5f39d397 | 4694 | struct btrfs_inode_item *inode_item; |
39279cc3 | 4695 | struct btrfs_key *location; |
5f39d397 | 4696 | struct btrfs_path *path; |
9c58309d CM |
4697 | struct btrfs_inode_ref *ref; |
4698 | struct btrfs_key key[2]; | |
4699 | u32 sizes[2]; | |
4700 | unsigned long ptr; | |
39279cc3 CM |
4701 | int ret; |
4702 | int owner; | |
4703 | ||
5f39d397 | 4704 | path = btrfs_alloc_path(); |
d8926bb3 MF |
4705 | if (!path) |
4706 | return ERR_PTR(-ENOMEM); | |
5f39d397 | 4707 | |
39279cc3 | 4708 | inode = new_inode(root->fs_info->sb); |
8fb27640 YS |
4709 | if (!inode) { |
4710 | btrfs_free_path(path); | |
39279cc3 | 4711 | return ERR_PTR(-ENOMEM); |
8fb27640 | 4712 | } |
39279cc3 | 4713 | |
581bb050 LZ |
4714 | /* |
4715 | * we have to initialize this early, so we can reclaim the inode | |
4716 | * number if we fail afterwards in this function. | |
4717 | */ | |
4718 | inode->i_ino = objectid; | |
4719 | ||
aec7477b | 4720 | if (dir) { |
1abe9b8a | 4721 | trace_btrfs_inode_request(dir); |
4722 | ||
3de4586c | 4723 | ret = btrfs_set_inode_index(dir, index); |
09771430 | 4724 | if (ret) { |
8fb27640 | 4725 | btrfs_free_path(path); |
09771430 | 4726 | iput(inode); |
aec7477b | 4727 | return ERR_PTR(ret); |
09771430 | 4728 | } |
aec7477b JB |
4729 | } |
4730 | /* | |
4731 | * index_cnt is ignored for everything but a dir, | |
4732 | * btrfs_get_inode_index_count has an explanation for the magic | |
4733 | * number | |
4734 | */ | |
4735 | BTRFS_I(inode)->index_cnt = 2; | |
39279cc3 | 4736 | BTRFS_I(inode)->root = root; |
e02119d5 | 4737 | BTRFS_I(inode)->generation = trans->transid; |
76195853 | 4738 | inode->i_generation = BTRFS_I(inode)->generation; |
b888db2b | 4739 | |
5dc562c5 JB |
4740 | /* |
4741 | * We could have gotten an inode number from somebody who was fsynced | |
4742 | * and then removed in this same transaction, so let's just set full | |
4743 | * sync since it will be a full sync anyway and this will blow away the | |
4744 | * old info in the log. | |
4745 | */ | |
4746 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
4747 | ||
569254b0 | 4748 | if (S_ISDIR(mode)) |
39279cc3 CM |
4749 | owner = 0; |
4750 | else | |
4751 | owner = 1; | |
9c58309d CM |
4752 | |
4753 | key[0].objectid = objectid; | |
4754 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
4755 | key[0].offset = 0; | |
4756 | ||
f186373f MF |
4757 | /* |
4758 | * Start new inodes with an inode_ref. This is slightly more | |
4759 | * efficient for small numbers of hard links since they will | |
4760 | * be packed into one item. Extended refs will kick in if we | |
4761 | * add more hard links than can fit in the ref item. | |
4762 | */ | |
9c58309d CM |
4763 | key[1].objectid = objectid; |
4764 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
4765 | key[1].offset = ref_objectid; | |
4766 | ||
4767 | sizes[0] = sizeof(struct btrfs_inode_item); | |
4768 | sizes[1] = name_len + sizeof(*ref); | |
4769 | ||
b9473439 | 4770 | path->leave_spinning = 1; |
9c58309d CM |
4771 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); |
4772 | if (ret != 0) | |
5f39d397 CM |
4773 | goto fail; |
4774 | ||
ecc11fab | 4775 | inode_init_owner(inode, dir, mode); |
a76a3cd4 | 4776 | inode_set_bytes(inode, 0); |
39279cc3 | 4777 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; |
5f39d397 CM |
4778 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
4779 | struct btrfs_inode_item); | |
293f7e07 LZ |
4780 | memset_extent_buffer(path->nodes[0], 0, (unsigned long)inode_item, |
4781 | sizeof(*inode_item)); | |
e02119d5 | 4782 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
9c58309d CM |
4783 | |
4784 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
4785 | struct btrfs_inode_ref); | |
4786 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
00e4e6b3 | 4787 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); |
9c58309d CM |
4788 | ptr = (unsigned long)(ref + 1); |
4789 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
4790 | ||
5f39d397 CM |
4791 | btrfs_mark_buffer_dirty(path->nodes[0]); |
4792 | btrfs_free_path(path); | |
4793 | ||
39279cc3 CM |
4794 | location = &BTRFS_I(inode)->location; |
4795 | location->objectid = objectid; | |
39279cc3 CM |
4796 | location->offset = 0; |
4797 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
4798 | ||
6cbff00f CH |
4799 | btrfs_inherit_iflags(inode, dir); |
4800 | ||
569254b0 | 4801 | if (S_ISREG(mode)) { |
94272164 CM |
4802 | if (btrfs_test_opt(root, NODATASUM)) |
4803 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; | |
75e7cb7f LB |
4804 | if (btrfs_test_opt(root, NODATACOW) || |
4805 | (BTRFS_I(dir)->flags & BTRFS_INODE_NODATACOW)) | |
94272164 CM |
4806 | BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; |
4807 | } | |
4808 | ||
39279cc3 | 4809 | insert_inode_hash(inode); |
5d4f98a2 | 4810 | inode_tree_add(inode); |
1abe9b8a | 4811 | |
4812 | trace_btrfs_inode_new(inode); | |
1973f0fa | 4813 | btrfs_set_inode_last_trans(trans, inode); |
1abe9b8a | 4814 | |
8ea05e3a AB |
4815 | btrfs_update_root_times(trans, root); |
4816 | ||
39279cc3 | 4817 | return inode; |
5f39d397 | 4818 | fail: |
aec7477b JB |
4819 | if (dir) |
4820 | BTRFS_I(dir)->index_cnt--; | |
5f39d397 | 4821 | btrfs_free_path(path); |
09771430 | 4822 | iput(inode); |
5f39d397 | 4823 | return ERR_PTR(ret); |
39279cc3 CM |
4824 | } |
4825 | ||
4826 | static inline u8 btrfs_inode_type(struct inode *inode) | |
4827 | { | |
4828 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
4829 | } | |
4830 | ||
d352ac68 CM |
4831 | /* |
4832 | * utility function to add 'inode' into 'parent_inode' with | |
4833 | * a give name and a given sequence number. | |
4834 | * if 'add_backref' is true, also insert a backref from the | |
4835 | * inode to the parent directory. | |
4836 | */ | |
e02119d5 CM |
4837 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
4838 | struct inode *parent_inode, struct inode *inode, | |
4839 | const char *name, int name_len, int add_backref, u64 index) | |
39279cc3 | 4840 | { |
4df27c4d | 4841 | int ret = 0; |
39279cc3 | 4842 | struct btrfs_key key; |
e02119d5 | 4843 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
33345d01 LZ |
4844 | u64 ino = btrfs_ino(inode); |
4845 | u64 parent_ino = btrfs_ino(parent_inode); | |
5f39d397 | 4846 | |
33345d01 | 4847 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
4848 | memcpy(&key, &BTRFS_I(inode)->root->root_key, sizeof(key)); |
4849 | } else { | |
33345d01 | 4850 | key.objectid = ino; |
4df27c4d YZ |
4851 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
4852 | key.offset = 0; | |
4853 | } | |
4854 | ||
33345d01 | 4855 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
4856 | ret = btrfs_add_root_ref(trans, root->fs_info->tree_root, |
4857 | key.objectid, root->root_key.objectid, | |
33345d01 | 4858 | parent_ino, index, name, name_len); |
4df27c4d | 4859 | } else if (add_backref) { |
33345d01 LZ |
4860 | ret = btrfs_insert_inode_ref(trans, root, name, name_len, ino, |
4861 | parent_ino, index); | |
4df27c4d | 4862 | } |
39279cc3 | 4863 | |
79787eaa JM |
4864 | /* Nothing to clean up yet */ |
4865 | if (ret) | |
4866 | return ret; | |
4df27c4d | 4867 | |
79787eaa JM |
4868 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
4869 | parent_inode, &key, | |
4870 | btrfs_inode_type(inode), index); | |
4871 | if (ret == -EEXIST) | |
4872 | goto fail_dir_item; | |
4873 | else if (ret) { | |
4874 | btrfs_abort_transaction(trans, root, ret); | |
4875 | return ret; | |
39279cc3 | 4876 | } |
79787eaa JM |
4877 | |
4878 | btrfs_i_size_write(parent_inode, parent_inode->i_size + | |
4879 | name_len * 2); | |
0c4d2d95 | 4880 | inode_inc_iversion(parent_inode); |
79787eaa JM |
4881 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
4882 | ret = btrfs_update_inode(trans, root, parent_inode); | |
4883 | if (ret) | |
4884 | btrfs_abort_transaction(trans, root, ret); | |
39279cc3 | 4885 | return ret; |
fe66a05a CM |
4886 | |
4887 | fail_dir_item: | |
4888 | if (unlikely(ino == BTRFS_FIRST_FREE_OBJECTID)) { | |
4889 | u64 local_index; | |
4890 | int err; | |
4891 | err = btrfs_del_root_ref(trans, root->fs_info->tree_root, | |
4892 | key.objectid, root->root_key.objectid, | |
4893 | parent_ino, &local_index, name, name_len); | |
4894 | ||
4895 | } else if (add_backref) { | |
4896 | u64 local_index; | |
4897 | int err; | |
4898 | ||
4899 | err = btrfs_del_inode_ref(trans, root, name, name_len, | |
4900 | ino, parent_ino, &local_index); | |
4901 | } | |
4902 | return ret; | |
39279cc3 CM |
4903 | } |
4904 | ||
4905 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
a1b075d2 JB |
4906 | struct inode *dir, struct dentry *dentry, |
4907 | struct inode *inode, int backref, u64 index) | |
39279cc3 | 4908 | { |
a1b075d2 JB |
4909 | int err = btrfs_add_link(trans, dir, inode, |
4910 | dentry->d_name.name, dentry->d_name.len, | |
4911 | backref, index); | |
39279cc3 CM |
4912 | if (err > 0) |
4913 | err = -EEXIST; | |
4914 | return err; | |
4915 | } | |
4916 | ||
618e21d5 | 4917 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1a67aafb | 4918 | umode_t mode, dev_t rdev) |
618e21d5 JB |
4919 | { |
4920 | struct btrfs_trans_handle *trans; | |
4921 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 4922 | struct inode *inode = NULL; |
618e21d5 JB |
4923 | int err; |
4924 | int drop_inode = 0; | |
4925 | u64 objectid; | |
00e4e6b3 | 4926 | u64 index = 0; |
618e21d5 JB |
4927 | |
4928 | if (!new_valid_dev(rdev)) | |
4929 | return -EINVAL; | |
4930 | ||
9ed74f2d JB |
4931 | /* |
4932 | * 2 for inode item and ref | |
4933 | * 2 for dir items | |
4934 | * 1 for xattr if selinux is on | |
4935 | */ | |
a22285a6 YZ |
4936 | trans = btrfs_start_transaction(root, 5); |
4937 | if (IS_ERR(trans)) | |
4938 | return PTR_ERR(trans); | |
1832a6d5 | 4939 | |
581bb050 LZ |
4940 | err = btrfs_find_free_ino(root, &objectid); |
4941 | if (err) | |
4942 | goto out_unlock; | |
4943 | ||
aec7477b | 4944 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 4945 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 4946 | mode, &index); |
7cf96da3 TI |
4947 | if (IS_ERR(inode)) { |
4948 | err = PTR_ERR(inode); | |
618e21d5 | 4949 | goto out_unlock; |
7cf96da3 | 4950 | } |
618e21d5 | 4951 | |
2a7dba39 | 4952 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf JB |
4953 | if (err) { |
4954 | drop_inode = 1; | |
4955 | goto out_unlock; | |
4956 | } | |
4957 | ||
2794ed01 FB |
4958 | err = btrfs_update_inode(trans, root, inode); |
4959 | if (err) { | |
4960 | drop_inode = 1; | |
4961 | goto out_unlock; | |
4962 | } | |
4963 | ||
ad19db71 CS |
4964 | /* |
4965 | * If the active LSM wants to access the inode during | |
4966 | * d_instantiate it needs these. Smack checks to see | |
4967 | * if the filesystem supports xattrs by looking at the | |
4968 | * ops vector. | |
4969 | */ | |
4970 | ||
4971 | inode->i_op = &btrfs_special_inode_operations; | |
a1b075d2 | 4972 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
618e21d5 JB |
4973 | if (err) |
4974 | drop_inode = 1; | |
4975 | else { | |
618e21d5 | 4976 | init_special_inode(inode, inode->i_mode, rdev); |
1b4ab1bb | 4977 | btrfs_update_inode(trans, root, inode); |
08c422c2 | 4978 | d_instantiate(dentry, inode); |
618e21d5 | 4979 | } |
618e21d5 | 4980 | out_unlock: |
7ad85bb7 | 4981 | btrfs_end_transaction(trans, root); |
b53d3f5d | 4982 | btrfs_btree_balance_dirty(root); |
618e21d5 JB |
4983 | if (drop_inode) { |
4984 | inode_dec_link_count(inode); | |
4985 | iput(inode); | |
4986 | } | |
618e21d5 JB |
4987 | return err; |
4988 | } | |
4989 | ||
39279cc3 | 4990 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
ebfc3b49 | 4991 | umode_t mode, bool excl) |
39279cc3 CM |
4992 | { |
4993 | struct btrfs_trans_handle *trans; | |
4994 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 4995 | struct inode *inode = NULL; |
43baa579 | 4996 | int drop_inode_on_err = 0; |
a22285a6 | 4997 | int err; |
39279cc3 | 4998 | u64 objectid; |
00e4e6b3 | 4999 | u64 index = 0; |
39279cc3 | 5000 | |
9ed74f2d JB |
5001 | /* |
5002 | * 2 for inode item and ref | |
5003 | * 2 for dir items | |
5004 | * 1 for xattr if selinux is on | |
5005 | */ | |
a22285a6 YZ |
5006 | trans = btrfs_start_transaction(root, 5); |
5007 | if (IS_ERR(trans)) | |
5008 | return PTR_ERR(trans); | |
9ed74f2d | 5009 | |
581bb050 LZ |
5010 | err = btrfs_find_free_ino(root, &objectid); |
5011 | if (err) | |
5012 | goto out_unlock; | |
5013 | ||
aec7477b | 5014 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 5015 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 5016 | mode, &index); |
7cf96da3 TI |
5017 | if (IS_ERR(inode)) { |
5018 | err = PTR_ERR(inode); | |
39279cc3 | 5019 | goto out_unlock; |
7cf96da3 | 5020 | } |
43baa579 | 5021 | drop_inode_on_err = 1; |
39279cc3 | 5022 | |
2a7dba39 | 5023 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
43baa579 | 5024 | if (err) |
33268eaf | 5025 | goto out_unlock; |
33268eaf | 5026 | |
ad19db71 CS |
5027 | /* |
5028 | * If the active LSM wants to access the inode during | |
5029 | * d_instantiate it needs these. Smack checks to see | |
5030 | * if the filesystem supports xattrs by looking at the | |
5031 | * ops vector. | |
5032 | */ | |
5033 | inode->i_fop = &btrfs_file_operations; | |
5034 | inode->i_op = &btrfs_file_inode_operations; | |
5035 | ||
a1b075d2 | 5036 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 | 5037 | if (err) |
43baa579 FB |
5038 | goto out_unlock; |
5039 | ||
5040 | inode->i_mapping->a_ops = &btrfs_aops; | |
5041 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; | |
5042 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; | |
5043 | d_instantiate(dentry, inode); | |
5044 | ||
39279cc3 | 5045 | out_unlock: |
7ad85bb7 | 5046 | btrfs_end_transaction(trans, root); |
43baa579 | 5047 | if (err && drop_inode_on_err) { |
39279cc3 CM |
5048 | inode_dec_link_count(inode); |
5049 | iput(inode); | |
5050 | } | |
b53d3f5d | 5051 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
5052 | return err; |
5053 | } | |
5054 | ||
5055 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
5056 | struct dentry *dentry) | |
5057 | { | |
5058 | struct btrfs_trans_handle *trans; | |
5059 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
5060 | struct inode *inode = old_dentry->d_inode; | |
00e4e6b3 | 5061 | u64 index; |
39279cc3 CM |
5062 | int err; |
5063 | int drop_inode = 0; | |
5064 | ||
4a8be425 TH |
5065 | /* do not allow sys_link's with other subvols of the same device */ |
5066 | if (root->objectid != BTRFS_I(inode)->root->objectid) | |
3ab3564f | 5067 | return -EXDEV; |
4a8be425 | 5068 | |
f186373f | 5069 | if (inode->i_nlink >= BTRFS_LINK_MAX) |
c055e99e | 5070 | return -EMLINK; |
4a8be425 | 5071 | |
3de4586c | 5072 | err = btrfs_set_inode_index(dir, &index); |
aec7477b JB |
5073 | if (err) |
5074 | goto fail; | |
5075 | ||
a22285a6 | 5076 | /* |
7e6b6465 | 5077 | * 2 items for inode and inode ref |
a22285a6 | 5078 | * 2 items for dir items |
7e6b6465 | 5079 | * 1 item for parent inode |
a22285a6 | 5080 | */ |
7e6b6465 | 5081 | trans = btrfs_start_transaction(root, 5); |
a22285a6 YZ |
5082 | if (IS_ERR(trans)) { |
5083 | err = PTR_ERR(trans); | |
5084 | goto fail; | |
5085 | } | |
5f39d397 | 5086 | |
3153495d | 5087 | btrfs_inc_nlink(inode); |
0c4d2d95 | 5088 | inode_inc_iversion(inode); |
3153495d | 5089 | inode->i_ctime = CURRENT_TIME; |
7de9c6ee | 5090 | ihold(inode); |
e9976151 | 5091 | set_bit(BTRFS_INODE_COPY_EVERYTHING, &BTRFS_I(inode)->runtime_flags); |
aec7477b | 5092 | |
a1b075d2 | 5093 | err = btrfs_add_nondir(trans, dir, dentry, inode, 1, index); |
5f39d397 | 5094 | |
a5719521 | 5095 | if (err) { |
54aa1f4d | 5096 | drop_inode = 1; |
a5719521 | 5097 | } else { |
10d9f309 | 5098 | struct dentry *parent = dentry->d_parent; |
a5719521 | 5099 | err = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
5100 | if (err) |
5101 | goto fail; | |
08c422c2 | 5102 | d_instantiate(dentry, inode); |
6a912213 | 5103 | btrfs_log_new_name(trans, inode, NULL, parent); |
a5719521 | 5104 | } |
39279cc3 | 5105 | |
7ad85bb7 | 5106 | btrfs_end_transaction(trans, root); |
1832a6d5 | 5107 | fail: |
39279cc3 CM |
5108 | if (drop_inode) { |
5109 | inode_dec_link_count(inode); | |
5110 | iput(inode); | |
5111 | } | |
b53d3f5d | 5112 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
5113 | return err; |
5114 | } | |
5115 | ||
18bb1db3 | 5116 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
39279cc3 | 5117 | { |
b9d86667 | 5118 | struct inode *inode = NULL; |
39279cc3 CM |
5119 | struct btrfs_trans_handle *trans; |
5120 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
5121 | int err = 0; | |
5122 | int drop_on_err = 0; | |
b9d86667 | 5123 | u64 objectid = 0; |
00e4e6b3 | 5124 | u64 index = 0; |
39279cc3 | 5125 | |
9ed74f2d JB |
5126 | /* |
5127 | * 2 items for inode and ref | |
5128 | * 2 items for dir items | |
5129 | * 1 for xattr if selinux is on | |
5130 | */ | |
a22285a6 YZ |
5131 | trans = btrfs_start_transaction(root, 5); |
5132 | if (IS_ERR(trans)) | |
5133 | return PTR_ERR(trans); | |
39279cc3 | 5134 | |
581bb050 LZ |
5135 | err = btrfs_find_free_ino(root, &objectid); |
5136 | if (err) | |
5137 | goto out_fail; | |
5138 | ||
aec7477b | 5139 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 5140 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 5141 | S_IFDIR | mode, &index); |
39279cc3 CM |
5142 | if (IS_ERR(inode)) { |
5143 | err = PTR_ERR(inode); | |
5144 | goto out_fail; | |
5145 | } | |
5f39d397 | 5146 | |
39279cc3 | 5147 | drop_on_err = 1; |
33268eaf | 5148 | |
2a7dba39 | 5149 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf JB |
5150 | if (err) |
5151 | goto out_fail; | |
5152 | ||
39279cc3 CM |
5153 | inode->i_op = &btrfs_dir_inode_operations; |
5154 | inode->i_fop = &btrfs_dir_file_operations; | |
39279cc3 | 5155 | |
dbe674a9 | 5156 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
5157 | err = btrfs_update_inode(trans, root, inode); |
5158 | if (err) | |
5159 | goto out_fail; | |
5f39d397 | 5160 | |
a1b075d2 JB |
5161 | err = btrfs_add_link(trans, dir, inode, dentry->d_name.name, |
5162 | dentry->d_name.len, 0, index); | |
39279cc3 CM |
5163 | if (err) |
5164 | goto out_fail; | |
5f39d397 | 5165 | |
39279cc3 CM |
5166 | d_instantiate(dentry, inode); |
5167 | drop_on_err = 0; | |
39279cc3 CM |
5168 | |
5169 | out_fail: | |
7ad85bb7 | 5170 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
5171 | if (drop_on_err) |
5172 | iput(inode); | |
b53d3f5d | 5173 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
5174 | return err; |
5175 | } | |
5176 | ||
d352ac68 CM |
5177 | /* helper for btfs_get_extent. Given an existing extent in the tree, |
5178 | * and an extent that you want to insert, deal with overlap and insert | |
5179 | * the new extent into the tree. | |
5180 | */ | |
3b951516 CM |
5181 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
5182 | struct extent_map *existing, | |
e6dcd2dc CM |
5183 | struct extent_map *em, |
5184 | u64 map_start, u64 map_len) | |
3b951516 CM |
5185 | { |
5186 | u64 start_diff; | |
3b951516 | 5187 | |
e6dcd2dc CM |
5188 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
5189 | start_diff = map_start - em->start; | |
5190 | em->start = map_start; | |
5191 | em->len = map_len; | |
c8b97818 CM |
5192 | if (em->block_start < EXTENT_MAP_LAST_BYTE && |
5193 | !test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { | |
e6dcd2dc | 5194 | em->block_start += start_diff; |
c8b97818 CM |
5195 | em->block_len -= start_diff; |
5196 | } | |
e6dcd2dc | 5197 | return add_extent_mapping(em_tree, em); |
3b951516 CM |
5198 | } |
5199 | ||
c8b97818 CM |
5200 | static noinline int uncompress_inline(struct btrfs_path *path, |
5201 | struct inode *inode, struct page *page, | |
5202 | size_t pg_offset, u64 extent_offset, | |
5203 | struct btrfs_file_extent_item *item) | |
5204 | { | |
5205 | int ret; | |
5206 | struct extent_buffer *leaf = path->nodes[0]; | |
5207 | char *tmp; | |
5208 | size_t max_size; | |
5209 | unsigned long inline_size; | |
5210 | unsigned long ptr; | |
261507a0 | 5211 | int compress_type; |
c8b97818 CM |
5212 | |
5213 | WARN_ON(pg_offset != 0); | |
261507a0 | 5214 | compress_type = btrfs_file_extent_compression(leaf, item); |
c8b97818 CM |
5215 | max_size = btrfs_file_extent_ram_bytes(leaf, item); |
5216 | inline_size = btrfs_file_extent_inline_item_len(leaf, | |
5217 | btrfs_item_nr(leaf, path->slots[0])); | |
5218 | tmp = kmalloc(inline_size, GFP_NOFS); | |
8d413713 TI |
5219 | if (!tmp) |
5220 | return -ENOMEM; | |
c8b97818 CM |
5221 | ptr = btrfs_file_extent_inline_start(item); |
5222 | ||
5223 | read_extent_buffer(leaf, tmp, ptr, inline_size); | |
5224 | ||
5b050f04 | 5225 | max_size = min_t(unsigned long, PAGE_CACHE_SIZE, max_size); |
261507a0 LZ |
5226 | ret = btrfs_decompress(compress_type, tmp, page, |
5227 | extent_offset, inline_size, max_size); | |
c8b97818 | 5228 | if (ret) { |
7ac687d9 | 5229 | char *kaddr = kmap_atomic(page); |
c8b97818 CM |
5230 | unsigned long copy_size = min_t(u64, |
5231 | PAGE_CACHE_SIZE - pg_offset, | |
5232 | max_size - extent_offset); | |
5233 | memset(kaddr + pg_offset, 0, copy_size); | |
7ac687d9 | 5234 | kunmap_atomic(kaddr); |
c8b97818 CM |
5235 | } |
5236 | kfree(tmp); | |
5237 | return 0; | |
5238 | } | |
5239 | ||
d352ac68 CM |
5240 | /* |
5241 | * a bit scary, this does extent mapping from logical file offset to the disk. | |
d397712b CM |
5242 | * the ugly parts come from merging extents from the disk with the in-ram |
5243 | * representation. This gets more complex because of the data=ordered code, | |
d352ac68 CM |
5244 | * where the in-ram extents might be locked pending data=ordered completion. |
5245 | * | |
5246 | * This also copies inline extents directly into the page. | |
5247 | */ | |
d397712b | 5248 | |
a52d9a80 | 5249 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 5250 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
5251 | int create) |
5252 | { | |
5253 | int ret; | |
5254 | int err = 0; | |
db94535d | 5255 | u64 bytenr; |
a52d9a80 CM |
5256 | u64 extent_start = 0; |
5257 | u64 extent_end = 0; | |
33345d01 | 5258 | u64 objectid = btrfs_ino(inode); |
a52d9a80 | 5259 | u32 found_type; |
f421950f | 5260 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
5261 | struct btrfs_root *root = BTRFS_I(inode)->root; |
5262 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
5263 | struct extent_buffer *leaf; |
5264 | struct btrfs_key found_key; | |
a52d9a80 CM |
5265 | struct extent_map *em = NULL; |
5266 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 5267 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 | 5268 | struct btrfs_trans_handle *trans = NULL; |
261507a0 | 5269 | int compress_type; |
a52d9a80 | 5270 | |
a52d9a80 | 5271 | again: |
890871be | 5272 | read_lock(&em_tree->lock); |
d1310b2e | 5273 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
5274 | if (em) |
5275 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
890871be | 5276 | read_unlock(&em_tree->lock); |
d1310b2e | 5277 | |
a52d9a80 | 5278 | if (em) { |
e1c4b745 CM |
5279 | if (em->start > start || em->start + em->len <= start) |
5280 | free_extent_map(em); | |
5281 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
5282 | free_extent_map(em); |
5283 | else | |
5284 | goto out; | |
a52d9a80 | 5285 | } |
172ddd60 | 5286 | em = alloc_extent_map(); |
a52d9a80 | 5287 | if (!em) { |
d1310b2e CM |
5288 | err = -ENOMEM; |
5289 | goto out; | |
a52d9a80 | 5290 | } |
e6dcd2dc | 5291 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 5292 | em->start = EXTENT_MAP_HOLE; |
445a6944 | 5293 | em->orig_start = EXTENT_MAP_HOLE; |
d1310b2e | 5294 | em->len = (u64)-1; |
c8b97818 | 5295 | em->block_len = (u64)-1; |
f421950f CM |
5296 | |
5297 | if (!path) { | |
5298 | path = btrfs_alloc_path(); | |
026fd317 JB |
5299 | if (!path) { |
5300 | err = -ENOMEM; | |
5301 | goto out; | |
5302 | } | |
5303 | /* | |
5304 | * Chances are we'll be called again, so go ahead and do | |
5305 | * readahead | |
5306 | */ | |
5307 | path->reada = 1; | |
f421950f CM |
5308 | } |
5309 | ||
179e29e4 CM |
5310 | ret = btrfs_lookup_file_extent(trans, root, path, |
5311 | objectid, start, trans != NULL); | |
a52d9a80 CM |
5312 | if (ret < 0) { |
5313 | err = ret; | |
5314 | goto out; | |
5315 | } | |
5316 | ||
5317 | if (ret != 0) { | |
5318 | if (path->slots[0] == 0) | |
5319 | goto not_found; | |
5320 | path->slots[0]--; | |
5321 | } | |
5322 | ||
5f39d397 CM |
5323 | leaf = path->nodes[0]; |
5324 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 5325 | struct btrfs_file_extent_item); |
a52d9a80 | 5326 | /* are we inside the extent that was found? */ |
5f39d397 CM |
5327 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
5328 | found_type = btrfs_key_type(&found_key); | |
5329 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
5330 | found_type != BTRFS_EXTENT_DATA_KEY) { |
5331 | goto not_found; | |
5332 | } | |
5333 | ||
5f39d397 CM |
5334 | found_type = btrfs_file_extent_type(leaf, item); |
5335 | extent_start = found_key.offset; | |
261507a0 | 5336 | compress_type = btrfs_file_extent_compression(leaf, item); |
d899e052 YZ |
5337 | if (found_type == BTRFS_FILE_EXTENT_REG || |
5338 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
a52d9a80 | 5339 | extent_end = extent_start + |
db94535d | 5340 | btrfs_file_extent_num_bytes(leaf, item); |
9036c102 YZ |
5341 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { |
5342 | size_t size; | |
5343 | size = btrfs_file_extent_inline_len(leaf, item); | |
5344 | extent_end = (extent_start + size + root->sectorsize - 1) & | |
5345 | ~((u64)root->sectorsize - 1); | |
5346 | } | |
5347 | ||
5348 | if (start >= extent_end) { | |
5349 | path->slots[0]++; | |
5350 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
5351 | ret = btrfs_next_leaf(root, path); | |
5352 | if (ret < 0) { | |
5353 | err = ret; | |
5354 | goto out; | |
a52d9a80 | 5355 | } |
9036c102 YZ |
5356 | if (ret > 0) |
5357 | goto not_found; | |
5358 | leaf = path->nodes[0]; | |
a52d9a80 | 5359 | } |
9036c102 YZ |
5360 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
5361 | if (found_key.objectid != objectid || | |
5362 | found_key.type != BTRFS_EXTENT_DATA_KEY) | |
5363 | goto not_found; | |
5364 | if (start + len <= found_key.offset) | |
5365 | goto not_found; | |
5366 | em->start = start; | |
5367 | em->len = found_key.offset - start; | |
5368 | goto not_found_em; | |
5369 | } | |
5370 | ||
d899e052 YZ |
5371 | if (found_type == BTRFS_FILE_EXTENT_REG || |
5372 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
9036c102 YZ |
5373 | em->start = extent_start; |
5374 | em->len = extent_end - extent_start; | |
ff5b7ee3 YZ |
5375 | em->orig_start = extent_start - |
5376 | btrfs_file_extent_offset(leaf, item); | |
db94535d CM |
5377 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
5378 | if (bytenr == 0) { | |
5f39d397 | 5379 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
5380 | goto insert; |
5381 | } | |
261507a0 | 5382 | if (compress_type != BTRFS_COMPRESS_NONE) { |
c8b97818 | 5383 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
261507a0 | 5384 | em->compress_type = compress_type; |
c8b97818 CM |
5385 | em->block_start = bytenr; |
5386 | em->block_len = btrfs_file_extent_disk_num_bytes(leaf, | |
5387 | item); | |
5388 | } else { | |
5389 | bytenr += btrfs_file_extent_offset(leaf, item); | |
5390 | em->block_start = bytenr; | |
5391 | em->block_len = em->len; | |
d899e052 YZ |
5392 | if (found_type == BTRFS_FILE_EXTENT_PREALLOC) |
5393 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
c8b97818 | 5394 | } |
a52d9a80 CM |
5395 | goto insert; |
5396 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 5397 | unsigned long ptr; |
a52d9a80 | 5398 | char *map; |
3326d1b0 CM |
5399 | size_t size; |
5400 | size_t extent_offset; | |
5401 | size_t copy_size; | |
a52d9a80 | 5402 | |
689f9346 | 5403 | em->block_start = EXTENT_MAP_INLINE; |
c8b97818 | 5404 | if (!page || create) { |
689f9346 | 5405 | em->start = extent_start; |
9036c102 | 5406 | em->len = extent_end - extent_start; |
689f9346 Y |
5407 | goto out; |
5408 | } | |
5f39d397 | 5409 | |
9036c102 YZ |
5410 | size = btrfs_file_extent_inline_len(leaf, item); |
5411 | extent_offset = page_offset(page) + pg_offset - extent_start; | |
70dec807 | 5412 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, |
3326d1b0 | 5413 | size - extent_offset); |
3326d1b0 | 5414 | em->start = extent_start + extent_offset; |
70dec807 CM |
5415 | em->len = (copy_size + root->sectorsize - 1) & |
5416 | ~((u64)root->sectorsize - 1); | |
ff5b7ee3 | 5417 | em->orig_start = EXTENT_MAP_INLINE; |
261507a0 | 5418 | if (compress_type) { |
c8b97818 | 5419 | set_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
261507a0 LZ |
5420 | em->compress_type = compress_type; |
5421 | } | |
689f9346 | 5422 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; |
179e29e4 | 5423 | if (create == 0 && !PageUptodate(page)) { |
261507a0 LZ |
5424 | if (btrfs_file_extent_compression(leaf, item) != |
5425 | BTRFS_COMPRESS_NONE) { | |
c8b97818 CM |
5426 | ret = uncompress_inline(path, inode, page, |
5427 | pg_offset, | |
5428 | extent_offset, item); | |
79787eaa | 5429 | BUG_ON(ret); /* -ENOMEM */ |
c8b97818 CM |
5430 | } else { |
5431 | map = kmap(page); | |
5432 | read_extent_buffer(leaf, map + pg_offset, ptr, | |
5433 | copy_size); | |
93c82d57 CM |
5434 | if (pg_offset + copy_size < PAGE_CACHE_SIZE) { |
5435 | memset(map + pg_offset + copy_size, 0, | |
5436 | PAGE_CACHE_SIZE - pg_offset - | |
5437 | copy_size); | |
5438 | } | |
c8b97818 CM |
5439 | kunmap(page); |
5440 | } | |
179e29e4 CM |
5441 | flush_dcache_page(page); |
5442 | } else if (create && PageUptodate(page)) { | |
6bf7e080 | 5443 | BUG(); |
179e29e4 CM |
5444 | if (!trans) { |
5445 | kunmap(page); | |
5446 | free_extent_map(em); | |
5447 | em = NULL; | |
ff5714cc | 5448 | |
b3b4aa74 | 5449 | btrfs_release_path(path); |
7a7eaa40 | 5450 | trans = btrfs_join_transaction(root); |
ff5714cc | 5451 | |
3612b495 TI |
5452 | if (IS_ERR(trans)) |
5453 | return ERR_CAST(trans); | |
179e29e4 CM |
5454 | goto again; |
5455 | } | |
c8b97818 | 5456 | map = kmap(page); |
70dec807 | 5457 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 | 5458 | copy_size); |
c8b97818 | 5459 | kunmap(page); |
179e29e4 | 5460 | btrfs_mark_buffer_dirty(leaf); |
a52d9a80 | 5461 | } |
d1310b2e | 5462 | set_extent_uptodate(io_tree, em->start, |
507903b8 | 5463 | extent_map_end(em) - 1, NULL, GFP_NOFS); |
a52d9a80 CM |
5464 | goto insert; |
5465 | } else { | |
31b1a2bd | 5466 | WARN(1, KERN_ERR "btrfs unknown found_type %d\n", found_type); |
a52d9a80 CM |
5467 | } |
5468 | not_found: | |
5469 | em->start = start; | |
d1310b2e | 5470 | em->len = len; |
a52d9a80 | 5471 | not_found_em: |
5f39d397 | 5472 | em->block_start = EXTENT_MAP_HOLE; |
9036c102 | 5473 | set_bit(EXTENT_FLAG_VACANCY, &em->flags); |
a52d9a80 | 5474 | insert: |
b3b4aa74 | 5475 | btrfs_release_path(path); |
d1310b2e | 5476 | if (em->start > start || extent_map_end(em) <= start) { |
d397712b CM |
5477 | printk(KERN_ERR "Btrfs: bad extent! em: [%llu %llu] passed " |
5478 | "[%llu %llu]\n", (unsigned long long)em->start, | |
5479 | (unsigned long long)em->len, | |
5480 | (unsigned long long)start, | |
5481 | (unsigned long long)len); | |
a52d9a80 CM |
5482 | err = -EIO; |
5483 | goto out; | |
5484 | } | |
d1310b2e CM |
5485 | |
5486 | err = 0; | |
890871be | 5487 | write_lock(&em_tree->lock); |
a52d9a80 | 5488 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
5489 | /* it is possible that someone inserted the extent into the tree |
5490 | * while we had the lock dropped. It is also possible that | |
5491 | * an overlapping map exists in the tree | |
5492 | */ | |
a52d9a80 | 5493 | if (ret == -EEXIST) { |
3b951516 | 5494 | struct extent_map *existing; |
e6dcd2dc CM |
5495 | |
5496 | ret = 0; | |
5497 | ||
3b951516 | 5498 | existing = lookup_extent_mapping(em_tree, start, len); |
e1c4b745 CM |
5499 | if (existing && (existing->start > start || |
5500 | existing->start + existing->len <= start)) { | |
5501 | free_extent_map(existing); | |
5502 | existing = NULL; | |
5503 | } | |
3b951516 CM |
5504 | if (!existing) { |
5505 | existing = lookup_extent_mapping(em_tree, em->start, | |
5506 | em->len); | |
5507 | if (existing) { | |
5508 | err = merge_extent_mapping(em_tree, existing, | |
e6dcd2dc CM |
5509 | em, start, |
5510 | root->sectorsize); | |
3b951516 CM |
5511 | free_extent_map(existing); |
5512 | if (err) { | |
5513 | free_extent_map(em); | |
5514 | em = NULL; | |
5515 | } | |
5516 | } else { | |
5517 | err = -EIO; | |
3b951516 CM |
5518 | free_extent_map(em); |
5519 | em = NULL; | |
5520 | } | |
5521 | } else { | |
5522 | free_extent_map(em); | |
5523 | em = existing; | |
e6dcd2dc | 5524 | err = 0; |
a52d9a80 | 5525 | } |
a52d9a80 | 5526 | } |
890871be | 5527 | write_unlock(&em_tree->lock); |
a52d9a80 | 5528 | out: |
1abe9b8a | 5529 | |
f0bd95ea TI |
5530 | if (em) |
5531 | trace_btrfs_get_extent(root, em); | |
1abe9b8a | 5532 | |
f421950f CM |
5533 | if (path) |
5534 | btrfs_free_path(path); | |
a52d9a80 CM |
5535 | if (trans) { |
5536 | ret = btrfs_end_transaction(trans, root); | |
d397712b | 5537 | if (!err) |
a52d9a80 CM |
5538 | err = ret; |
5539 | } | |
a52d9a80 CM |
5540 | if (err) { |
5541 | free_extent_map(em); | |
a52d9a80 CM |
5542 | return ERR_PTR(err); |
5543 | } | |
79787eaa | 5544 | BUG_ON(!em); /* Error is always set */ |
a52d9a80 CM |
5545 | return em; |
5546 | } | |
5547 | ||
ec29ed5b CM |
5548 | struct extent_map *btrfs_get_extent_fiemap(struct inode *inode, struct page *page, |
5549 | size_t pg_offset, u64 start, u64 len, | |
5550 | int create) | |
5551 | { | |
5552 | struct extent_map *em; | |
5553 | struct extent_map *hole_em = NULL; | |
5554 | u64 range_start = start; | |
5555 | u64 end; | |
5556 | u64 found; | |
5557 | u64 found_end; | |
5558 | int err = 0; | |
5559 | ||
5560 | em = btrfs_get_extent(inode, page, pg_offset, start, len, create); | |
5561 | if (IS_ERR(em)) | |
5562 | return em; | |
5563 | if (em) { | |
5564 | /* | |
5565 | * if our em maps to a hole, there might | |
5566 | * actually be delalloc bytes behind it | |
5567 | */ | |
5568 | if (em->block_start != EXTENT_MAP_HOLE) | |
5569 | return em; | |
5570 | else | |
5571 | hole_em = em; | |
5572 | } | |
5573 | ||
5574 | /* check to see if we've wrapped (len == -1 or similar) */ | |
5575 | end = start + len; | |
5576 | if (end < start) | |
5577 | end = (u64)-1; | |
5578 | else | |
5579 | end -= 1; | |
5580 | ||
5581 | em = NULL; | |
5582 | ||
5583 | /* ok, we didn't find anything, lets look for delalloc */ | |
5584 | found = count_range_bits(&BTRFS_I(inode)->io_tree, &range_start, | |
5585 | end, len, EXTENT_DELALLOC, 1); | |
5586 | found_end = range_start + found; | |
5587 | if (found_end < range_start) | |
5588 | found_end = (u64)-1; | |
5589 | ||
5590 | /* | |
5591 | * we didn't find anything useful, return | |
5592 | * the original results from get_extent() | |
5593 | */ | |
5594 | if (range_start > end || found_end <= start) { | |
5595 | em = hole_em; | |
5596 | hole_em = NULL; | |
5597 | goto out; | |
5598 | } | |
5599 | ||
5600 | /* adjust the range_start to make sure it doesn't | |
5601 | * go backwards from the start they passed in | |
5602 | */ | |
5603 | range_start = max(start,range_start); | |
5604 | found = found_end - range_start; | |
5605 | ||
5606 | if (found > 0) { | |
5607 | u64 hole_start = start; | |
5608 | u64 hole_len = len; | |
5609 | ||
172ddd60 | 5610 | em = alloc_extent_map(); |
ec29ed5b CM |
5611 | if (!em) { |
5612 | err = -ENOMEM; | |
5613 | goto out; | |
5614 | } | |
5615 | /* | |
5616 | * when btrfs_get_extent can't find anything it | |
5617 | * returns one huge hole | |
5618 | * | |
5619 | * make sure what it found really fits our range, and | |
5620 | * adjust to make sure it is based on the start from | |
5621 | * the caller | |
5622 | */ | |
5623 | if (hole_em) { | |
5624 | u64 calc_end = extent_map_end(hole_em); | |
5625 | ||
5626 | if (calc_end <= start || (hole_em->start > end)) { | |
5627 | free_extent_map(hole_em); | |
5628 | hole_em = NULL; | |
5629 | } else { | |
5630 | hole_start = max(hole_em->start, start); | |
5631 | hole_len = calc_end - hole_start; | |
5632 | } | |
5633 | } | |
5634 | em->bdev = NULL; | |
5635 | if (hole_em && range_start > hole_start) { | |
5636 | /* our hole starts before our delalloc, so we | |
5637 | * have to return just the parts of the hole | |
5638 | * that go until the delalloc starts | |
5639 | */ | |
5640 | em->len = min(hole_len, | |
5641 | range_start - hole_start); | |
5642 | em->start = hole_start; | |
5643 | em->orig_start = hole_start; | |
5644 | /* | |
5645 | * don't adjust block start at all, | |
5646 | * it is fixed at EXTENT_MAP_HOLE | |
5647 | */ | |
5648 | em->block_start = hole_em->block_start; | |
5649 | em->block_len = hole_len; | |
5650 | } else { | |
5651 | em->start = range_start; | |
5652 | em->len = found; | |
5653 | em->orig_start = range_start; | |
5654 | em->block_start = EXTENT_MAP_DELALLOC; | |
5655 | em->block_len = found; | |
5656 | } | |
5657 | } else if (hole_em) { | |
5658 | return hole_em; | |
5659 | } | |
5660 | out: | |
5661 | ||
5662 | free_extent_map(hole_em); | |
5663 | if (err) { | |
5664 | free_extent_map(em); | |
5665 | return ERR_PTR(err); | |
5666 | } | |
5667 | return em; | |
5668 | } | |
5669 | ||
4b46fce2 | 5670 | static struct extent_map *btrfs_new_extent_direct(struct inode *inode, |
16d299ac | 5671 | struct extent_map *em, |
4b46fce2 JB |
5672 | u64 start, u64 len) |
5673 | { | |
5674 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5675 | struct btrfs_trans_handle *trans; | |
4b46fce2 JB |
5676 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
5677 | struct btrfs_key ins; | |
5678 | u64 alloc_hint; | |
5679 | int ret; | |
16d299ac | 5680 | bool insert = false; |
4b46fce2 | 5681 | |
16d299ac JB |
5682 | /* |
5683 | * Ok if the extent map we looked up is a hole and is for the exact | |
5684 | * range we want, there is no reason to allocate a new one, however if | |
5685 | * it is not right then we need to free this one and drop the cache for | |
5686 | * our range. | |
5687 | */ | |
5688 | if (em->block_start != EXTENT_MAP_HOLE || em->start != start || | |
5689 | em->len != len) { | |
5690 | free_extent_map(em); | |
5691 | em = NULL; | |
5692 | insert = true; | |
5693 | btrfs_drop_extent_cache(inode, start, start + len - 1, 0); | |
5694 | } | |
4b46fce2 | 5695 | |
7a7eaa40 | 5696 | trans = btrfs_join_transaction(root); |
3612b495 TI |
5697 | if (IS_ERR(trans)) |
5698 | return ERR_CAST(trans); | |
4b46fce2 JB |
5699 | |
5700 | trans->block_rsv = &root->fs_info->delalloc_block_rsv; | |
5701 | ||
5702 | alloc_hint = get_extent_allocation_hint(inode, start, len); | |
5703 | ret = btrfs_reserve_extent(trans, root, len, root->sectorsize, 0, | |
81c9ad23 | 5704 | alloc_hint, &ins, 1); |
4b46fce2 JB |
5705 | if (ret) { |
5706 | em = ERR_PTR(ret); | |
5707 | goto out; | |
5708 | } | |
5709 | ||
4b46fce2 | 5710 | if (!em) { |
172ddd60 | 5711 | em = alloc_extent_map(); |
16d299ac JB |
5712 | if (!em) { |
5713 | em = ERR_PTR(-ENOMEM); | |
5714 | goto out; | |
5715 | } | |
4b46fce2 JB |
5716 | } |
5717 | ||
5718 | em->start = start; | |
5719 | em->orig_start = em->start; | |
5720 | em->len = ins.offset; | |
5721 | ||
5722 | em->block_start = ins.objectid; | |
5723 | em->block_len = ins.offset; | |
5724 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
16d299ac JB |
5725 | |
5726 | /* | |
5727 | * We need to do this because if we're using the original em we searched | |
5728 | * for, we could have EXTENT_FLAG_VACANCY set, and we don't want that. | |
5729 | */ | |
5730 | em->flags = 0; | |
4b46fce2 JB |
5731 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
5732 | ||
16d299ac | 5733 | while (insert) { |
4b46fce2 JB |
5734 | write_lock(&em_tree->lock); |
5735 | ret = add_extent_mapping(em_tree, em); | |
5736 | write_unlock(&em_tree->lock); | |
5737 | if (ret != -EEXIST) | |
5738 | break; | |
5739 | btrfs_drop_extent_cache(inode, start, start + em->len - 1, 0); | |
5740 | } | |
5741 | ||
5742 | ret = btrfs_add_ordered_extent_dio(inode, start, ins.objectid, | |
5743 | ins.offset, ins.offset, 0); | |
5744 | if (ret) { | |
5745 | btrfs_free_reserved_extent(root, ins.objectid, ins.offset); | |
5746 | em = ERR_PTR(ret); | |
5747 | } | |
5748 | out: | |
5749 | btrfs_end_transaction(trans, root); | |
5750 | return em; | |
5751 | } | |
5752 | ||
46bfbb5c CM |
5753 | /* |
5754 | * returns 1 when the nocow is safe, < 1 on error, 0 if the | |
5755 | * block must be cow'd | |
5756 | */ | |
5757 | static noinline int can_nocow_odirect(struct btrfs_trans_handle *trans, | |
5758 | struct inode *inode, u64 offset, u64 len) | |
5759 | { | |
5760 | struct btrfs_path *path; | |
5761 | int ret; | |
5762 | struct extent_buffer *leaf; | |
5763 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5764 | struct btrfs_file_extent_item *fi; | |
5765 | struct btrfs_key key; | |
5766 | u64 disk_bytenr; | |
5767 | u64 backref_offset; | |
5768 | u64 extent_end; | |
5769 | u64 num_bytes; | |
5770 | int slot; | |
5771 | int found_type; | |
5772 | ||
5773 | path = btrfs_alloc_path(); | |
5774 | if (!path) | |
5775 | return -ENOMEM; | |
5776 | ||
33345d01 | 5777 | ret = btrfs_lookup_file_extent(trans, root, path, btrfs_ino(inode), |
46bfbb5c CM |
5778 | offset, 0); |
5779 | if (ret < 0) | |
5780 | goto out; | |
5781 | ||
5782 | slot = path->slots[0]; | |
5783 | if (ret == 1) { | |
5784 | if (slot == 0) { | |
5785 | /* can't find the item, must cow */ | |
5786 | ret = 0; | |
5787 | goto out; | |
5788 | } | |
5789 | slot--; | |
5790 | } | |
5791 | ret = 0; | |
5792 | leaf = path->nodes[0]; | |
5793 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
33345d01 | 5794 | if (key.objectid != btrfs_ino(inode) || |
46bfbb5c CM |
5795 | key.type != BTRFS_EXTENT_DATA_KEY) { |
5796 | /* not our file or wrong item type, must cow */ | |
5797 | goto out; | |
5798 | } | |
5799 | ||
5800 | if (key.offset > offset) { | |
5801 | /* Wrong offset, must cow */ | |
5802 | goto out; | |
5803 | } | |
5804 | ||
5805 | fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
5806 | found_type = btrfs_file_extent_type(leaf, fi); | |
5807 | if (found_type != BTRFS_FILE_EXTENT_REG && | |
5808 | found_type != BTRFS_FILE_EXTENT_PREALLOC) { | |
5809 | /* not a regular extent, must cow */ | |
5810 | goto out; | |
5811 | } | |
5812 | disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi); | |
5813 | backref_offset = btrfs_file_extent_offset(leaf, fi); | |
5814 | ||
5815 | extent_end = key.offset + btrfs_file_extent_num_bytes(leaf, fi); | |
5816 | if (extent_end < offset + len) { | |
5817 | /* extent doesn't include our full range, must cow */ | |
5818 | goto out; | |
5819 | } | |
5820 | ||
5821 | if (btrfs_extent_readonly(root, disk_bytenr)) | |
5822 | goto out; | |
5823 | ||
5824 | /* | |
5825 | * look for other files referencing this extent, if we | |
5826 | * find any we must cow | |
5827 | */ | |
33345d01 | 5828 | if (btrfs_cross_ref_exist(trans, root, btrfs_ino(inode), |
46bfbb5c CM |
5829 | key.offset - backref_offset, disk_bytenr)) |
5830 | goto out; | |
5831 | ||
5832 | /* | |
5833 | * adjust disk_bytenr and num_bytes to cover just the bytes | |
5834 | * in this extent we are about to write. If there | |
5835 | * are any csums in that range we have to cow in order | |
5836 | * to keep the csums correct | |
5837 | */ | |
5838 | disk_bytenr += backref_offset; | |
5839 | disk_bytenr += offset - key.offset; | |
5840 | num_bytes = min(offset + len, extent_end) - offset; | |
5841 | if (csum_exist_in_range(root, disk_bytenr, num_bytes)) | |
5842 | goto out; | |
5843 | /* | |
5844 | * all of the above have passed, it is safe to overwrite this extent | |
5845 | * without cow | |
5846 | */ | |
5847 | ret = 1; | |
5848 | out: | |
5849 | btrfs_free_path(path); | |
5850 | return ret; | |
5851 | } | |
5852 | ||
eb838e73 JB |
5853 | static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend, |
5854 | struct extent_state **cached_state, int writing) | |
5855 | { | |
5856 | struct btrfs_ordered_extent *ordered; | |
5857 | int ret = 0; | |
5858 | ||
5859 | while (1) { | |
5860 | lock_extent_bits(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
5861 | 0, cached_state); | |
5862 | /* | |
5863 | * We're concerned with the entire range that we're going to be | |
5864 | * doing DIO to, so we need to make sure theres no ordered | |
5865 | * extents in this range. | |
5866 | */ | |
5867 | ordered = btrfs_lookup_ordered_range(inode, lockstart, | |
5868 | lockend - lockstart + 1); | |
5869 | ||
5870 | /* | |
5871 | * We need to make sure there are no buffered pages in this | |
5872 | * range either, we could have raced between the invalidate in | |
5873 | * generic_file_direct_write and locking the extent. The | |
5874 | * invalidate needs to happen so that reads after a write do not | |
5875 | * get stale data. | |
5876 | */ | |
5877 | if (!ordered && (!writing || | |
5878 | !test_range_bit(&BTRFS_I(inode)->io_tree, | |
5879 | lockstart, lockend, EXTENT_UPTODATE, 0, | |
5880 | *cached_state))) | |
5881 | break; | |
5882 | ||
5883 | unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
5884 | cached_state, GFP_NOFS); | |
5885 | ||
5886 | if (ordered) { | |
5887 | btrfs_start_ordered_extent(inode, ordered, 1); | |
5888 | btrfs_put_ordered_extent(ordered); | |
5889 | } else { | |
5890 | /* Screw you mmap */ | |
5891 | ret = filemap_write_and_wait_range(inode->i_mapping, | |
5892 | lockstart, | |
5893 | lockend); | |
5894 | if (ret) | |
5895 | break; | |
5896 | ||
5897 | /* | |
5898 | * If we found a page that couldn't be invalidated just | |
5899 | * fall back to buffered. | |
5900 | */ | |
5901 | ret = invalidate_inode_pages2_range(inode->i_mapping, | |
5902 | lockstart >> PAGE_CACHE_SHIFT, | |
5903 | lockend >> PAGE_CACHE_SHIFT); | |
5904 | if (ret) | |
5905 | break; | |
5906 | } | |
5907 | ||
5908 | cond_resched(); | |
5909 | } | |
5910 | ||
5911 | return ret; | |
5912 | } | |
5913 | ||
69ffb543 JB |
5914 | static struct extent_map *create_pinned_em(struct inode *inode, u64 start, |
5915 | u64 len, u64 orig_start, | |
5916 | u64 block_start, u64 block_len, | |
5917 | int type) | |
5918 | { | |
5919 | struct extent_map_tree *em_tree; | |
5920 | struct extent_map *em; | |
5921 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
5922 | int ret; | |
5923 | ||
5924 | em_tree = &BTRFS_I(inode)->extent_tree; | |
5925 | em = alloc_extent_map(); | |
5926 | if (!em) | |
5927 | return ERR_PTR(-ENOMEM); | |
5928 | ||
5929 | em->start = start; | |
5930 | em->orig_start = orig_start; | |
5931 | em->len = len; | |
5932 | em->block_len = block_len; | |
5933 | em->block_start = block_start; | |
5934 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
5935 | set_bit(EXTENT_FLAG_PINNED, &em->flags); | |
5936 | if (type == BTRFS_ORDERED_PREALLOC) | |
5937 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
5938 | ||
5939 | do { | |
5940 | btrfs_drop_extent_cache(inode, em->start, | |
5941 | em->start + em->len - 1, 0); | |
5942 | write_lock(&em_tree->lock); | |
5943 | ret = add_extent_mapping(em_tree, em); | |
5944 | write_unlock(&em_tree->lock); | |
5945 | } while (ret == -EEXIST); | |
5946 | ||
5947 | if (ret) { | |
5948 | free_extent_map(em); | |
5949 | return ERR_PTR(ret); | |
5950 | } | |
5951 | ||
5952 | return em; | |
5953 | } | |
5954 | ||
5955 | ||
4b46fce2 JB |
5956 | static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock, |
5957 | struct buffer_head *bh_result, int create) | |
5958 | { | |
5959 | struct extent_map *em; | |
5960 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
eb838e73 | 5961 | struct extent_state *cached_state = NULL; |
4b46fce2 | 5962 | u64 start = iblock << inode->i_blkbits; |
eb838e73 | 5963 | u64 lockstart, lockend; |
4b46fce2 | 5964 | u64 len = bh_result->b_size; |
46bfbb5c | 5965 | struct btrfs_trans_handle *trans; |
eb838e73 JB |
5966 | int unlock_bits = EXTENT_LOCKED; |
5967 | int ret; | |
5968 | ||
eb838e73 JB |
5969 | if (create) { |
5970 | ret = btrfs_delalloc_reserve_space(inode, len); | |
5971 | if (ret) | |
5972 | return ret; | |
5973 | unlock_bits |= EXTENT_DELALLOC | EXTENT_DIRTY; | |
c329861d JB |
5974 | } else { |
5975 | len = min_t(u64, len, root->sectorsize); | |
eb838e73 JB |
5976 | } |
5977 | ||
c329861d JB |
5978 | lockstart = start; |
5979 | lockend = start + len - 1; | |
5980 | ||
eb838e73 JB |
5981 | /* |
5982 | * If this errors out it's because we couldn't invalidate pagecache for | |
5983 | * this range and we need to fallback to buffered. | |
5984 | */ | |
5985 | if (lock_extent_direct(inode, lockstart, lockend, &cached_state, create)) | |
5986 | return -ENOTBLK; | |
5987 | ||
5988 | if (create) { | |
5989 | ret = set_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, | |
5990 | lockend, EXTENT_DELALLOC, NULL, | |
5991 | &cached_state, GFP_NOFS); | |
5992 | if (ret) | |
5993 | goto unlock_err; | |
5994 | } | |
4b46fce2 JB |
5995 | |
5996 | em = btrfs_get_extent(inode, NULL, 0, start, len, 0); | |
eb838e73 JB |
5997 | if (IS_ERR(em)) { |
5998 | ret = PTR_ERR(em); | |
5999 | goto unlock_err; | |
6000 | } | |
4b46fce2 JB |
6001 | |
6002 | /* | |
6003 | * Ok for INLINE and COMPRESSED extents we need to fallback on buffered | |
6004 | * io. INLINE is special, and we could probably kludge it in here, but | |
6005 | * it's still buffered so for safety lets just fall back to the generic | |
6006 | * buffered path. | |
6007 | * | |
6008 | * For COMPRESSED we _have_ to read the entire extent in so we can | |
6009 | * decompress it, so there will be buffering required no matter what we | |
6010 | * do, so go ahead and fallback to buffered. | |
6011 | * | |
6012 | * We return -ENOTBLK because thats what makes DIO go ahead and go back | |
6013 | * to buffered IO. Don't blame me, this is the price we pay for using | |
6014 | * the generic code. | |
6015 | */ | |
6016 | if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags) || | |
6017 | em->block_start == EXTENT_MAP_INLINE) { | |
6018 | free_extent_map(em); | |
eb838e73 JB |
6019 | ret = -ENOTBLK; |
6020 | goto unlock_err; | |
4b46fce2 JB |
6021 | } |
6022 | ||
6023 | /* Just a good old fashioned hole, return */ | |
6024 | if (!create && (em->block_start == EXTENT_MAP_HOLE || | |
6025 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { | |
6026 | free_extent_map(em); | |
eb838e73 JB |
6027 | ret = 0; |
6028 | goto unlock_err; | |
4b46fce2 JB |
6029 | } |
6030 | ||
6031 | /* | |
6032 | * We don't allocate a new extent in the following cases | |
6033 | * | |
6034 | * 1) The inode is marked as NODATACOW. In this case we'll just use the | |
6035 | * existing extent. | |
6036 | * 2) The extent is marked as PREALLOC. We're good to go here and can | |
6037 | * just use the extent. | |
6038 | * | |
6039 | */ | |
46bfbb5c | 6040 | if (!create) { |
eb838e73 JB |
6041 | len = min(len, em->len - (start - em->start)); |
6042 | lockstart = start + len; | |
6043 | goto unlock; | |
46bfbb5c | 6044 | } |
4b46fce2 JB |
6045 | |
6046 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || | |
6047 | ((BTRFS_I(inode)->flags & BTRFS_INODE_NODATACOW) && | |
6048 | em->block_start != EXTENT_MAP_HOLE)) { | |
4b46fce2 JB |
6049 | int type; |
6050 | int ret; | |
46bfbb5c | 6051 | u64 block_start; |
4b46fce2 JB |
6052 | |
6053 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
6054 | type = BTRFS_ORDERED_PREALLOC; | |
6055 | else | |
6056 | type = BTRFS_ORDERED_NOCOW; | |
46bfbb5c | 6057 | len = min(len, em->len - (start - em->start)); |
4b46fce2 | 6058 | block_start = em->block_start + (start - em->start); |
46bfbb5c CM |
6059 | |
6060 | /* | |
6061 | * we're not going to log anything, but we do need | |
6062 | * to make sure the current transaction stays open | |
6063 | * while we look for nocow cross refs | |
6064 | */ | |
7a7eaa40 | 6065 | trans = btrfs_join_transaction(root); |
3612b495 | 6066 | if (IS_ERR(trans)) |
46bfbb5c CM |
6067 | goto must_cow; |
6068 | ||
6069 | if (can_nocow_odirect(trans, inode, start, len) == 1) { | |
69ffb543 JB |
6070 | u64 orig_start = em->start; |
6071 | ||
6072 | if (type == BTRFS_ORDERED_PREALLOC) { | |
6073 | free_extent_map(em); | |
6074 | em = create_pinned_em(inode, start, len, | |
6075 | orig_start, | |
6076 | block_start, len, type); | |
6077 | if (IS_ERR(em)) { | |
6078 | btrfs_end_transaction(trans, root); | |
6079 | goto unlock_err; | |
6080 | } | |
6081 | } | |
6082 | ||
46bfbb5c CM |
6083 | ret = btrfs_add_ordered_extent_dio(inode, start, |
6084 | block_start, len, len, type); | |
6085 | btrfs_end_transaction(trans, root); | |
6086 | if (ret) { | |
6087 | free_extent_map(em); | |
eb838e73 | 6088 | goto unlock_err; |
46bfbb5c CM |
6089 | } |
6090 | goto unlock; | |
4b46fce2 | 6091 | } |
46bfbb5c | 6092 | btrfs_end_transaction(trans, root); |
4b46fce2 | 6093 | } |
46bfbb5c CM |
6094 | must_cow: |
6095 | /* | |
6096 | * this will cow the extent, reset the len in case we changed | |
6097 | * it above | |
6098 | */ | |
6099 | len = bh_result->b_size; | |
16d299ac | 6100 | em = btrfs_new_extent_direct(inode, em, start, len); |
eb838e73 JB |
6101 | if (IS_ERR(em)) { |
6102 | ret = PTR_ERR(em); | |
6103 | goto unlock_err; | |
6104 | } | |
46bfbb5c CM |
6105 | len = min(len, em->len - (start - em->start)); |
6106 | unlock: | |
4b46fce2 JB |
6107 | bh_result->b_blocknr = (em->block_start + (start - em->start)) >> |
6108 | inode->i_blkbits; | |
46bfbb5c | 6109 | bh_result->b_size = len; |
4b46fce2 JB |
6110 | bh_result->b_bdev = em->bdev; |
6111 | set_buffer_mapped(bh_result); | |
c3473e83 JB |
6112 | if (create) { |
6113 | if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
6114 | set_buffer_new(bh_result); | |
6115 | ||
6116 | /* | |
6117 | * Need to update the i_size under the extent lock so buffered | |
6118 | * readers will get the updated i_size when we unlock. | |
6119 | */ | |
6120 | if (start + len > i_size_read(inode)) | |
6121 | i_size_write(inode, start + len); | |
6122 | } | |
4b46fce2 | 6123 | |
eb838e73 JB |
6124 | /* |
6125 | * In the case of write we need to clear and unlock the entire range, | |
6126 | * in the case of read we need to unlock only the end area that we | |
6127 | * aren't using if there is any left over space. | |
6128 | */ | |
24c03fa5 LB |
6129 | if (lockstart < lockend) { |
6130 | if (create && len < lockend - lockstart) { | |
6131 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, | |
9e8a4a8b LB |
6132 | lockstart + len - 1, |
6133 | unlock_bits | EXTENT_DEFRAG, 1, 0, | |
24c03fa5 LB |
6134 | &cached_state, GFP_NOFS); |
6135 | /* | |
6136 | * Beside unlock, we also need to cleanup reserved space | |
6137 | * for the left range by attaching EXTENT_DO_ACCOUNTING. | |
6138 | */ | |
6139 | clear_extent_bit(&BTRFS_I(inode)->io_tree, | |
6140 | lockstart + len, lockend, | |
9e8a4a8b LB |
6141 | unlock_bits | EXTENT_DO_ACCOUNTING | |
6142 | EXTENT_DEFRAG, 1, 0, NULL, GFP_NOFS); | |
24c03fa5 LB |
6143 | } else { |
6144 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, | |
6145 | lockend, unlock_bits, 1, 0, | |
6146 | &cached_state, GFP_NOFS); | |
6147 | } | |
6148 | } else { | |
eb838e73 | 6149 | free_extent_state(cached_state); |
24c03fa5 | 6150 | } |
eb838e73 | 6151 | |
4b46fce2 JB |
6152 | free_extent_map(em); |
6153 | ||
6154 | return 0; | |
eb838e73 JB |
6155 | |
6156 | unlock_err: | |
6157 | if (create) | |
6158 | unlock_bits |= EXTENT_DO_ACCOUNTING; | |
6159 | ||
6160 | clear_extent_bit(&BTRFS_I(inode)->io_tree, lockstart, lockend, | |
6161 | unlock_bits, 1, 0, &cached_state, GFP_NOFS); | |
6162 | return ret; | |
4b46fce2 JB |
6163 | } |
6164 | ||
6165 | struct btrfs_dio_private { | |
6166 | struct inode *inode; | |
6167 | u64 logical_offset; | |
6168 | u64 disk_bytenr; | |
6169 | u64 bytes; | |
4b46fce2 | 6170 | void *private; |
e65e1535 MX |
6171 | |
6172 | /* number of bios pending for this dio */ | |
6173 | atomic_t pending_bios; | |
6174 | ||
6175 | /* IO errors */ | |
6176 | int errors; | |
6177 | ||
6178 | struct bio *orig_bio; | |
4b46fce2 JB |
6179 | }; |
6180 | ||
6181 | static void btrfs_endio_direct_read(struct bio *bio, int err) | |
6182 | { | |
e65e1535 | 6183 | struct btrfs_dio_private *dip = bio->bi_private; |
4b46fce2 JB |
6184 | struct bio_vec *bvec_end = bio->bi_io_vec + bio->bi_vcnt - 1; |
6185 | struct bio_vec *bvec = bio->bi_io_vec; | |
4b46fce2 JB |
6186 | struct inode *inode = dip->inode; |
6187 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
6188 | u64 start; | |
4b46fce2 JB |
6189 | |
6190 | start = dip->logical_offset; | |
6191 | do { | |
6192 | if (!(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) { | |
6193 | struct page *page = bvec->bv_page; | |
6194 | char *kaddr; | |
6195 | u32 csum = ~(u32)0; | |
c329861d | 6196 | u64 private = ~(u32)0; |
4b46fce2 JB |
6197 | unsigned long flags; |
6198 | ||
c329861d JB |
6199 | if (get_state_private(&BTRFS_I(inode)->io_tree, |
6200 | start, &private)) | |
6201 | goto failed; | |
4b46fce2 | 6202 | local_irq_save(flags); |
7ac687d9 | 6203 | kaddr = kmap_atomic(page); |
4b46fce2 JB |
6204 | csum = btrfs_csum_data(root, kaddr + bvec->bv_offset, |
6205 | csum, bvec->bv_len); | |
6206 | btrfs_csum_final(csum, (char *)&csum); | |
7ac687d9 | 6207 | kunmap_atomic(kaddr); |
4b46fce2 JB |
6208 | local_irq_restore(flags); |
6209 | ||
6210 | flush_dcache_page(bvec->bv_page); | |
c329861d JB |
6211 | if (csum != private) { |
6212 | failed: | |
33345d01 | 6213 | printk(KERN_ERR "btrfs csum failed ino %llu off" |
4b46fce2 | 6214 | " %llu csum %u private %u\n", |
33345d01 LZ |
6215 | (unsigned long long)btrfs_ino(inode), |
6216 | (unsigned long long)start, | |
c329861d | 6217 | csum, (unsigned)private); |
4b46fce2 JB |
6218 | err = -EIO; |
6219 | } | |
6220 | } | |
6221 | ||
6222 | start += bvec->bv_len; | |
4b46fce2 JB |
6223 | bvec++; |
6224 | } while (bvec <= bvec_end); | |
6225 | ||
6226 | unlock_extent(&BTRFS_I(inode)->io_tree, dip->logical_offset, | |
d0082371 | 6227 | dip->logical_offset + dip->bytes - 1); |
4b46fce2 JB |
6228 | bio->bi_private = dip->private; |
6229 | ||
4b46fce2 | 6230 | kfree(dip); |
c0da7aa1 JB |
6231 | |
6232 | /* If we had a csum failure make sure to clear the uptodate flag */ | |
6233 | if (err) | |
6234 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
4b46fce2 JB |
6235 | dio_end_io(bio, err); |
6236 | } | |
6237 | ||
6238 | static void btrfs_endio_direct_write(struct bio *bio, int err) | |
6239 | { | |
6240 | struct btrfs_dio_private *dip = bio->bi_private; | |
6241 | struct inode *inode = dip->inode; | |
6242 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
4b46fce2 | 6243 | struct btrfs_ordered_extent *ordered = NULL; |
163cf09c CM |
6244 | u64 ordered_offset = dip->logical_offset; |
6245 | u64 ordered_bytes = dip->bytes; | |
4b46fce2 JB |
6246 | int ret; |
6247 | ||
6248 | if (err) | |
6249 | goto out_done; | |
163cf09c CM |
6250 | again: |
6251 | ret = btrfs_dec_test_first_ordered_pending(inode, &ordered, | |
6252 | &ordered_offset, | |
5fd02043 | 6253 | ordered_bytes, !err); |
4b46fce2 | 6254 | if (!ret) |
163cf09c | 6255 | goto out_test; |
4b46fce2 | 6256 | |
5fd02043 JB |
6257 | ordered->work.func = finish_ordered_fn; |
6258 | ordered->work.flags = 0; | |
6259 | btrfs_queue_worker(&root->fs_info->endio_write_workers, | |
6260 | &ordered->work); | |
163cf09c CM |
6261 | out_test: |
6262 | /* | |
6263 | * our bio might span multiple ordered extents. If we haven't | |
6264 | * completed the accounting for the whole dio, go back and try again | |
6265 | */ | |
6266 | if (ordered_offset < dip->logical_offset + dip->bytes) { | |
6267 | ordered_bytes = dip->logical_offset + dip->bytes - | |
6268 | ordered_offset; | |
5fd02043 | 6269 | ordered = NULL; |
163cf09c CM |
6270 | goto again; |
6271 | } | |
4b46fce2 JB |
6272 | out_done: |
6273 | bio->bi_private = dip->private; | |
6274 | ||
4b46fce2 | 6275 | kfree(dip); |
c0da7aa1 JB |
6276 | |
6277 | /* If we had an error make sure to clear the uptodate flag */ | |
6278 | if (err) | |
6279 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
4b46fce2 JB |
6280 | dio_end_io(bio, err); |
6281 | } | |
6282 | ||
eaf25d93 CM |
6283 | static int __btrfs_submit_bio_start_direct_io(struct inode *inode, int rw, |
6284 | struct bio *bio, int mirror_num, | |
6285 | unsigned long bio_flags, u64 offset) | |
6286 | { | |
6287 | int ret; | |
6288 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
6289 | ret = btrfs_csum_one_bio(root, inode, bio, offset, 1); | |
79787eaa | 6290 | BUG_ON(ret); /* -ENOMEM */ |
eaf25d93 CM |
6291 | return 0; |
6292 | } | |
6293 | ||
e65e1535 MX |
6294 | static void btrfs_end_dio_bio(struct bio *bio, int err) |
6295 | { | |
6296 | struct btrfs_dio_private *dip = bio->bi_private; | |
6297 | ||
6298 | if (err) { | |
33345d01 | 6299 | printk(KERN_ERR "btrfs direct IO failed ino %llu rw %lu " |
3dd1462e | 6300 | "sector %#Lx len %u err no %d\n", |
33345d01 | 6301 | (unsigned long long)btrfs_ino(dip->inode), bio->bi_rw, |
3dd1462e | 6302 | (unsigned long long)bio->bi_sector, bio->bi_size, err); |
e65e1535 MX |
6303 | dip->errors = 1; |
6304 | ||
6305 | /* | |
6306 | * before atomic variable goto zero, we must make sure | |
6307 | * dip->errors is perceived to be set. | |
6308 | */ | |
6309 | smp_mb__before_atomic_dec(); | |
6310 | } | |
6311 | ||
6312 | /* if there are more bios still pending for this dio, just exit */ | |
6313 | if (!atomic_dec_and_test(&dip->pending_bios)) | |
6314 | goto out; | |
6315 | ||
6316 | if (dip->errors) | |
6317 | bio_io_error(dip->orig_bio); | |
6318 | else { | |
6319 | set_bit(BIO_UPTODATE, &dip->orig_bio->bi_flags); | |
6320 | bio_endio(dip->orig_bio, 0); | |
6321 | } | |
6322 | out: | |
6323 | bio_put(bio); | |
6324 | } | |
6325 | ||
6326 | static struct bio *btrfs_dio_bio_alloc(struct block_device *bdev, | |
6327 | u64 first_sector, gfp_t gfp_flags) | |
6328 | { | |
6329 | int nr_vecs = bio_get_nr_vecs(bdev); | |
6330 | return btrfs_bio_alloc(bdev, first_sector, nr_vecs, gfp_flags); | |
6331 | } | |
6332 | ||
6333 | static inline int __btrfs_submit_dio_bio(struct bio *bio, struct inode *inode, | |
6334 | int rw, u64 file_offset, int skip_sum, | |
c329861d | 6335 | int async_submit) |
e65e1535 MX |
6336 | { |
6337 | int write = rw & REQ_WRITE; | |
6338 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
6339 | int ret; | |
6340 | ||
b812ce28 JB |
6341 | if (async_submit) |
6342 | async_submit = !atomic_read(&BTRFS_I(inode)->sync_writers); | |
6343 | ||
e65e1535 | 6344 | bio_get(bio); |
5fd02043 JB |
6345 | |
6346 | if (!write) { | |
6347 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); | |
6348 | if (ret) | |
6349 | goto err; | |
6350 | } | |
e65e1535 | 6351 | |
1ae39938 JB |
6352 | if (skip_sum) |
6353 | goto map; | |
6354 | ||
6355 | if (write && async_submit) { | |
e65e1535 MX |
6356 | ret = btrfs_wq_submit_bio(root->fs_info, |
6357 | inode, rw, bio, 0, 0, | |
6358 | file_offset, | |
6359 | __btrfs_submit_bio_start_direct_io, | |
6360 | __btrfs_submit_bio_done); | |
6361 | goto err; | |
1ae39938 JB |
6362 | } else if (write) { |
6363 | /* | |
6364 | * If we aren't doing async submit, calculate the csum of the | |
6365 | * bio now. | |
6366 | */ | |
6367 | ret = btrfs_csum_one_bio(root, inode, bio, file_offset, 1); | |
6368 | if (ret) | |
6369 | goto err; | |
c2db1073 | 6370 | } else if (!skip_sum) { |
c329861d | 6371 | ret = btrfs_lookup_bio_sums_dio(root, inode, bio, file_offset); |
c2db1073 TI |
6372 | if (ret) |
6373 | goto err; | |
6374 | } | |
e65e1535 | 6375 | |
1ae39938 JB |
6376 | map: |
6377 | ret = btrfs_map_bio(root, rw, bio, 0, async_submit); | |
e65e1535 MX |
6378 | err: |
6379 | bio_put(bio); | |
6380 | return ret; | |
6381 | } | |
6382 | ||
6383 | static int btrfs_submit_direct_hook(int rw, struct btrfs_dio_private *dip, | |
6384 | int skip_sum) | |
6385 | { | |
6386 | struct inode *inode = dip->inode; | |
6387 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
e65e1535 MX |
6388 | struct bio *bio; |
6389 | struct bio *orig_bio = dip->orig_bio; | |
6390 | struct bio_vec *bvec = orig_bio->bi_io_vec; | |
6391 | u64 start_sector = orig_bio->bi_sector; | |
6392 | u64 file_offset = dip->logical_offset; | |
6393 | u64 submit_len = 0; | |
6394 | u64 map_length; | |
6395 | int nr_pages = 0; | |
e65e1535 | 6396 | int ret = 0; |
1ae39938 | 6397 | int async_submit = 0; |
e65e1535 | 6398 | |
e65e1535 | 6399 | map_length = orig_bio->bi_size; |
3ec706c8 | 6400 | ret = btrfs_map_block(root->fs_info, READ, start_sector << 9, |
e65e1535 MX |
6401 | &map_length, NULL, 0); |
6402 | if (ret) { | |
64728bbb | 6403 | bio_put(orig_bio); |
e65e1535 MX |
6404 | return -EIO; |
6405 | } | |
6406 | ||
02f57c7a JB |
6407 | if (map_length >= orig_bio->bi_size) { |
6408 | bio = orig_bio; | |
6409 | goto submit; | |
6410 | } | |
6411 | ||
1ae39938 | 6412 | async_submit = 1; |
02f57c7a JB |
6413 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, start_sector, GFP_NOFS); |
6414 | if (!bio) | |
6415 | return -ENOMEM; | |
6416 | bio->bi_private = dip; | |
6417 | bio->bi_end_io = btrfs_end_dio_bio; | |
6418 | atomic_inc(&dip->pending_bios); | |
6419 | ||
e65e1535 MX |
6420 | while (bvec <= (orig_bio->bi_io_vec + orig_bio->bi_vcnt - 1)) { |
6421 | if (unlikely(map_length < submit_len + bvec->bv_len || | |
6422 | bio_add_page(bio, bvec->bv_page, bvec->bv_len, | |
6423 | bvec->bv_offset) < bvec->bv_len)) { | |
6424 | /* | |
6425 | * inc the count before we submit the bio so | |
6426 | * we know the end IO handler won't happen before | |
6427 | * we inc the count. Otherwise, the dip might get freed | |
6428 | * before we're done setting it up | |
6429 | */ | |
6430 | atomic_inc(&dip->pending_bios); | |
6431 | ret = __btrfs_submit_dio_bio(bio, inode, rw, | |
6432 | file_offset, skip_sum, | |
c329861d | 6433 | async_submit); |
e65e1535 MX |
6434 | if (ret) { |
6435 | bio_put(bio); | |
6436 | atomic_dec(&dip->pending_bios); | |
6437 | goto out_err; | |
6438 | } | |
6439 | ||
e65e1535 MX |
6440 | start_sector += submit_len >> 9; |
6441 | file_offset += submit_len; | |
6442 | ||
6443 | submit_len = 0; | |
6444 | nr_pages = 0; | |
6445 | ||
6446 | bio = btrfs_dio_bio_alloc(orig_bio->bi_bdev, | |
6447 | start_sector, GFP_NOFS); | |
6448 | if (!bio) | |
6449 | goto out_err; | |
6450 | bio->bi_private = dip; | |
6451 | bio->bi_end_io = btrfs_end_dio_bio; | |
6452 | ||
6453 | map_length = orig_bio->bi_size; | |
3ec706c8 SB |
6454 | ret = btrfs_map_block(root->fs_info, READ, |
6455 | start_sector << 9, | |
e65e1535 MX |
6456 | &map_length, NULL, 0); |
6457 | if (ret) { | |
6458 | bio_put(bio); | |
6459 | goto out_err; | |
6460 | } | |
6461 | } else { | |
6462 | submit_len += bvec->bv_len; | |
6463 | nr_pages ++; | |
6464 | bvec++; | |
6465 | } | |
6466 | } | |
6467 | ||
02f57c7a | 6468 | submit: |
e65e1535 | 6469 | ret = __btrfs_submit_dio_bio(bio, inode, rw, file_offset, skip_sum, |
c329861d | 6470 | async_submit); |
e65e1535 MX |
6471 | if (!ret) |
6472 | return 0; | |
6473 | ||
6474 | bio_put(bio); | |
6475 | out_err: | |
6476 | dip->errors = 1; | |
6477 | /* | |
6478 | * before atomic variable goto zero, we must | |
6479 | * make sure dip->errors is perceived to be set. | |
6480 | */ | |
6481 | smp_mb__before_atomic_dec(); | |
6482 | if (atomic_dec_and_test(&dip->pending_bios)) | |
6483 | bio_io_error(dip->orig_bio); | |
6484 | ||
6485 | /* bio_end_io() will handle error, so we needn't return it */ | |
6486 | return 0; | |
6487 | } | |
6488 | ||
4b46fce2 JB |
6489 | static void btrfs_submit_direct(int rw, struct bio *bio, struct inode *inode, |
6490 | loff_t file_offset) | |
6491 | { | |
6492 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
6493 | struct btrfs_dio_private *dip; | |
6494 | struct bio_vec *bvec = bio->bi_io_vec; | |
4b46fce2 | 6495 | int skip_sum; |
7b6d91da | 6496 | int write = rw & REQ_WRITE; |
4b46fce2 JB |
6497 | int ret = 0; |
6498 | ||
6499 | skip_sum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; | |
6500 | ||
6501 | dip = kmalloc(sizeof(*dip), GFP_NOFS); | |
6502 | if (!dip) { | |
6503 | ret = -ENOMEM; | |
6504 | goto free_ordered; | |
6505 | } | |
4b46fce2 JB |
6506 | |
6507 | dip->private = bio->bi_private; | |
6508 | dip->inode = inode; | |
6509 | dip->logical_offset = file_offset; | |
6510 | ||
4b46fce2 JB |
6511 | dip->bytes = 0; |
6512 | do { | |
6513 | dip->bytes += bvec->bv_len; | |
6514 | bvec++; | |
6515 | } while (bvec <= (bio->bi_io_vec + bio->bi_vcnt - 1)); | |
6516 | ||
46bfbb5c | 6517 | dip->disk_bytenr = (u64)bio->bi_sector << 9; |
4b46fce2 | 6518 | bio->bi_private = dip; |
e65e1535 MX |
6519 | dip->errors = 0; |
6520 | dip->orig_bio = bio; | |
6521 | atomic_set(&dip->pending_bios, 0); | |
4b46fce2 JB |
6522 | |
6523 | if (write) | |
6524 | bio->bi_end_io = btrfs_endio_direct_write; | |
6525 | else | |
6526 | bio->bi_end_io = btrfs_endio_direct_read; | |
6527 | ||
e65e1535 MX |
6528 | ret = btrfs_submit_direct_hook(rw, dip, skip_sum); |
6529 | if (!ret) | |
eaf25d93 | 6530 | return; |
4b46fce2 JB |
6531 | free_ordered: |
6532 | /* | |
6533 | * If this is a write, we need to clean up the reserved space and kill | |
6534 | * the ordered extent. | |
6535 | */ | |
6536 | if (write) { | |
6537 | struct btrfs_ordered_extent *ordered; | |
955256f2 | 6538 | ordered = btrfs_lookup_ordered_extent(inode, file_offset); |
4b46fce2 JB |
6539 | if (!test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags) && |
6540 | !test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags)) | |
6541 | btrfs_free_reserved_extent(root, ordered->start, | |
6542 | ordered->disk_len); | |
6543 | btrfs_put_ordered_extent(ordered); | |
6544 | btrfs_put_ordered_extent(ordered); | |
6545 | } | |
6546 | bio_endio(bio, ret); | |
6547 | } | |
6548 | ||
5a5f79b5 CM |
6549 | static ssize_t check_direct_IO(struct btrfs_root *root, int rw, struct kiocb *iocb, |
6550 | const struct iovec *iov, loff_t offset, | |
6551 | unsigned long nr_segs) | |
6552 | { | |
6553 | int seg; | |
a1b75f7d | 6554 | int i; |
5a5f79b5 CM |
6555 | size_t size; |
6556 | unsigned long addr; | |
6557 | unsigned blocksize_mask = root->sectorsize - 1; | |
6558 | ssize_t retval = -EINVAL; | |
6559 | loff_t end = offset; | |
6560 | ||
6561 | if (offset & blocksize_mask) | |
6562 | goto out; | |
6563 | ||
6564 | /* Check the memory alignment. Blocks cannot straddle pages */ | |
6565 | for (seg = 0; seg < nr_segs; seg++) { | |
6566 | addr = (unsigned long)iov[seg].iov_base; | |
6567 | size = iov[seg].iov_len; | |
6568 | end += size; | |
a1b75f7d | 6569 | if ((addr & blocksize_mask) || (size & blocksize_mask)) |
5a5f79b5 | 6570 | goto out; |
a1b75f7d JB |
6571 | |
6572 | /* If this is a write we don't need to check anymore */ | |
6573 | if (rw & WRITE) | |
6574 | continue; | |
6575 | ||
6576 | /* | |
6577 | * Check to make sure we don't have duplicate iov_base's in this | |
6578 | * iovec, if so return EINVAL, otherwise we'll get csum errors | |
6579 | * when reading back. | |
6580 | */ | |
6581 | for (i = seg + 1; i < nr_segs; i++) { | |
6582 | if (iov[seg].iov_base == iov[i].iov_base) | |
6583 | goto out; | |
6584 | } | |
5a5f79b5 CM |
6585 | } |
6586 | retval = 0; | |
6587 | out: | |
6588 | return retval; | |
6589 | } | |
eb838e73 | 6590 | |
16432985 CM |
6591 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, |
6592 | const struct iovec *iov, loff_t offset, | |
6593 | unsigned long nr_segs) | |
6594 | { | |
4b46fce2 JB |
6595 | struct file *file = iocb->ki_filp; |
6596 | struct inode *inode = file->f_mapping->host; | |
4b46fce2 | 6597 | |
5a5f79b5 | 6598 | if (check_direct_IO(BTRFS_I(inode)->root, rw, iocb, iov, |
eb838e73 | 6599 | offset, nr_segs)) |
5a5f79b5 | 6600 | return 0; |
3f7c579c | 6601 | |
eb838e73 | 6602 | return __blockdev_direct_IO(rw, iocb, inode, |
5a5f79b5 CM |
6603 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev, |
6604 | iov, offset, nr_segs, btrfs_get_blocks_direct, NULL, | |
6605 | btrfs_submit_direct, 0); | |
16432985 CM |
6606 | } |
6607 | ||
05dadc09 TI |
6608 | #define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC) |
6609 | ||
1506fcc8 YS |
6610 | static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
6611 | __u64 start, __u64 len) | |
6612 | { | |
05dadc09 TI |
6613 | int ret; |
6614 | ||
6615 | ret = fiemap_check_flags(fieinfo, BTRFS_FIEMAP_FLAGS); | |
6616 | if (ret) | |
6617 | return ret; | |
6618 | ||
ec29ed5b | 6619 | return extent_fiemap(inode, fieinfo, start, len, btrfs_get_extent_fiemap); |
1506fcc8 YS |
6620 | } |
6621 | ||
a52d9a80 | 6622 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 6623 | { |
d1310b2e CM |
6624 | struct extent_io_tree *tree; |
6625 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
8ddc7d9c | 6626 | return extent_read_full_page(tree, page, btrfs_get_extent, 0); |
9ebefb18 | 6627 | } |
1832a6d5 | 6628 | |
a52d9a80 | 6629 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 6630 | { |
d1310b2e | 6631 | struct extent_io_tree *tree; |
b888db2b CM |
6632 | |
6633 | ||
6634 | if (current->flags & PF_MEMALLOC) { | |
6635 | redirty_page_for_writepage(wbc, page); | |
6636 | unlock_page(page); | |
6637 | return 0; | |
6638 | } | |
d1310b2e | 6639 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 6640 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
6641 | } |
6642 | ||
f421950f CM |
6643 | int btrfs_writepages(struct address_space *mapping, |
6644 | struct writeback_control *wbc) | |
b293f02e | 6645 | { |
d1310b2e | 6646 | struct extent_io_tree *tree; |
771ed689 | 6647 | |
d1310b2e | 6648 | tree = &BTRFS_I(mapping->host)->io_tree; |
b293f02e CM |
6649 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
6650 | } | |
6651 | ||
3ab2fb5a CM |
6652 | static int |
6653 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
6654 | struct list_head *pages, unsigned nr_pages) | |
6655 | { | |
d1310b2e CM |
6656 | struct extent_io_tree *tree; |
6657 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
6658 | return extent_readpages(tree, mapping, pages, nr_pages, |
6659 | btrfs_get_extent); | |
6660 | } | |
e6dcd2dc | 6661 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 6662 | { |
d1310b2e CM |
6663 | struct extent_io_tree *tree; |
6664 | struct extent_map_tree *map; | |
a52d9a80 | 6665 | int ret; |
8c2383c3 | 6666 | |
d1310b2e CM |
6667 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
6668 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 6669 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
6670 | if (ret == 1) { |
6671 | ClearPagePrivate(page); | |
6672 | set_page_private(page, 0); | |
6673 | page_cache_release(page); | |
39279cc3 | 6674 | } |
a52d9a80 | 6675 | return ret; |
39279cc3 CM |
6676 | } |
6677 | ||
e6dcd2dc CM |
6678 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
6679 | { | |
98509cfc CM |
6680 | if (PageWriteback(page) || PageDirty(page)) |
6681 | return 0; | |
b335b003 | 6682 | return __btrfs_releasepage(page, gfp_flags & GFP_NOFS); |
e6dcd2dc CM |
6683 | } |
6684 | ||
a52d9a80 | 6685 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 6686 | { |
5fd02043 | 6687 | struct inode *inode = page->mapping->host; |
d1310b2e | 6688 | struct extent_io_tree *tree; |
e6dcd2dc | 6689 | struct btrfs_ordered_extent *ordered; |
2ac55d41 | 6690 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
6691 | u64 page_start = page_offset(page); |
6692 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
39279cc3 | 6693 | |
8b62b72b CM |
6694 | /* |
6695 | * we have the page locked, so new writeback can't start, | |
6696 | * and the dirty bit won't be cleared while we are here. | |
6697 | * | |
6698 | * Wait for IO on this page so that we can safely clear | |
6699 | * the PagePrivate2 bit and do ordered accounting | |
6700 | */ | |
e6dcd2dc | 6701 | wait_on_page_writeback(page); |
8b62b72b | 6702 | |
5fd02043 | 6703 | tree = &BTRFS_I(inode)->io_tree; |
e6dcd2dc CM |
6704 | if (offset) { |
6705 | btrfs_releasepage(page, GFP_NOFS); | |
6706 | return; | |
6707 | } | |
d0082371 | 6708 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state); |
5fd02043 | 6709 | ordered = btrfs_lookup_ordered_extent(inode, |
e6dcd2dc CM |
6710 | page_offset(page)); |
6711 | if (ordered) { | |
eb84ae03 CM |
6712 | /* |
6713 | * IO on this page will never be started, so we need | |
6714 | * to account for any ordered extents now | |
6715 | */ | |
e6dcd2dc CM |
6716 | clear_extent_bit(tree, page_start, page_end, |
6717 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
9e8a4a8b LB |
6718 | EXTENT_LOCKED | EXTENT_DO_ACCOUNTING | |
6719 | EXTENT_DEFRAG, 1, 0, &cached_state, GFP_NOFS); | |
8b62b72b CM |
6720 | /* |
6721 | * whoever cleared the private bit is responsible | |
6722 | * for the finish_ordered_io | |
6723 | */ | |
5fd02043 JB |
6724 | if (TestClearPagePrivate2(page) && |
6725 | btrfs_dec_test_ordered_pending(inode, &ordered, page_start, | |
6726 | PAGE_CACHE_SIZE, 1)) { | |
6727 | btrfs_finish_ordered_io(ordered); | |
8b62b72b | 6728 | } |
e6dcd2dc | 6729 | btrfs_put_ordered_extent(ordered); |
2ac55d41 | 6730 | cached_state = NULL; |
d0082371 | 6731 | lock_extent_bits(tree, page_start, page_end, 0, &cached_state); |
e6dcd2dc CM |
6732 | } |
6733 | clear_extent_bit(tree, page_start, page_end, | |
32c00aff | 6734 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | |
9e8a4a8b LB |
6735 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, 1, 1, |
6736 | &cached_state, GFP_NOFS); | |
e6dcd2dc CM |
6737 | __btrfs_releasepage(page, GFP_NOFS); |
6738 | ||
4a096752 | 6739 | ClearPageChecked(page); |
9ad6b7bc | 6740 | if (PagePrivate(page)) { |
9ad6b7bc CM |
6741 | ClearPagePrivate(page); |
6742 | set_page_private(page, 0); | |
6743 | page_cache_release(page); | |
6744 | } | |
39279cc3 CM |
6745 | } |
6746 | ||
9ebefb18 CM |
6747 | /* |
6748 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
6749 | * called from a page fault handler when a page is first dirtied. Hence we must | |
6750 | * be careful to check for EOF conditions here. We set the page up correctly | |
6751 | * for a written page which means we get ENOSPC checking when writing into | |
6752 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
6753 | * support these features. | |
6754 | * | |
6755 | * We are not allowed to take the i_mutex here so we have to play games to | |
6756 | * protect against truncate races as the page could now be beyond EOF. Because | |
6757 | * vmtruncate() writes the inode size before removing pages, once we have the | |
6758 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
6759 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
6760 | * unlock the page. | |
6761 | */ | |
c2ec175c | 6762 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
9ebefb18 | 6763 | { |
c2ec175c | 6764 | struct page *page = vmf->page; |
6da6abae | 6765 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 6766 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
6767 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
6768 | struct btrfs_ordered_extent *ordered; | |
2ac55d41 | 6769 | struct extent_state *cached_state = NULL; |
e6dcd2dc CM |
6770 | char *kaddr; |
6771 | unsigned long zero_start; | |
9ebefb18 | 6772 | loff_t size; |
1832a6d5 | 6773 | int ret; |
9998eb70 | 6774 | int reserved = 0; |
a52d9a80 | 6775 | u64 page_start; |
e6dcd2dc | 6776 | u64 page_end; |
9ebefb18 | 6777 | |
b2b5ef5c | 6778 | sb_start_pagefault(inode->i_sb); |
0ca1f7ce | 6779 | ret = btrfs_delalloc_reserve_space(inode, PAGE_CACHE_SIZE); |
9998eb70 | 6780 | if (!ret) { |
e41f941a | 6781 | ret = file_update_time(vma->vm_file); |
9998eb70 CM |
6782 | reserved = 1; |
6783 | } | |
56a76f82 NP |
6784 | if (ret) { |
6785 | if (ret == -ENOMEM) | |
6786 | ret = VM_FAULT_OOM; | |
6787 | else /* -ENOSPC, -EIO, etc */ | |
6788 | ret = VM_FAULT_SIGBUS; | |
9998eb70 CM |
6789 | if (reserved) |
6790 | goto out; | |
6791 | goto out_noreserve; | |
56a76f82 | 6792 | } |
1832a6d5 | 6793 | |
56a76f82 | 6794 | ret = VM_FAULT_NOPAGE; /* make the VM retry the fault */ |
e6dcd2dc | 6795 | again: |
9ebefb18 | 6796 | lock_page(page); |
9ebefb18 | 6797 | size = i_size_read(inode); |
e6dcd2dc CM |
6798 | page_start = page_offset(page); |
6799 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
a52d9a80 | 6800 | |
9ebefb18 | 6801 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 6802 | (page_start >= size)) { |
9ebefb18 CM |
6803 | /* page got truncated out from underneath us */ |
6804 | goto out_unlock; | |
6805 | } | |
e6dcd2dc CM |
6806 | wait_on_page_writeback(page); |
6807 | ||
d0082371 | 6808 | lock_extent_bits(io_tree, page_start, page_end, 0, &cached_state); |
e6dcd2dc CM |
6809 | set_page_extent_mapped(page); |
6810 | ||
eb84ae03 CM |
6811 | /* |
6812 | * we can't set the delalloc bits if there are pending ordered | |
6813 | * extents. Drop our locks and wait for them to finish | |
6814 | */ | |
e6dcd2dc CM |
6815 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
6816 | if (ordered) { | |
2ac55d41 JB |
6817 | unlock_extent_cached(io_tree, page_start, page_end, |
6818 | &cached_state, GFP_NOFS); | |
e6dcd2dc | 6819 | unlock_page(page); |
eb84ae03 | 6820 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
6821 | btrfs_put_ordered_extent(ordered); |
6822 | goto again; | |
6823 | } | |
6824 | ||
fbf19087 JB |
6825 | /* |
6826 | * XXX - page_mkwrite gets called every time the page is dirtied, even | |
6827 | * if it was already dirty, so for space accounting reasons we need to | |
6828 | * clear any delalloc bits for the range we are fixing to save. There | |
6829 | * is probably a better way to do this, but for now keep consistent with | |
6830 | * prepare_pages in the normal write path. | |
6831 | */ | |
2ac55d41 | 6832 | clear_extent_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, |
9e8a4a8b LB |
6833 | EXTENT_DIRTY | EXTENT_DELALLOC | |
6834 | EXTENT_DO_ACCOUNTING | EXTENT_DEFRAG, | |
2ac55d41 | 6835 | 0, 0, &cached_state, GFP_NOFS); |
fbf19087 | 6836 | |
2ac55d41 JB |
6837 | ret = btrfs_set_extent_delalloc(inode, page_start, page_end, |
6838 | &cached_state); | |
9ed74f2d | 6839 | if (ret) { |
2ac55d41 JB |
6840 | unlock_extent_cached(io_tree, page_start, page_end, |
6841 | &cached_state, GFP_NOFS); | |
9ed74f2d JB |
6842 | ret = VM_FAULT_SIGBUS; |
6843 | goto out_unlock; | |
6844 | } | |
e6dcd2dc | 6845 | ret = 0; |
9ebefb18 CM |
6846 | |
6847 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 6848 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 6849 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 6850 | else |
e6dcd2dc | 6851 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 6852 | |
e6dcd2dc CM |
6853 | if (zero_start != PAGE_CACHE_SIZE) { |
6854 | kaddr = kmap(page); | |
6855 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
6856 | flush_dcache_page(page); | |
6857 | kunmap(page); | |
6858 | } | |
247e743c | 6859 | ClearPageChecked(page); |
e6dcd2dc | 6860 | set_page_dirty(page); |
50a9b214 | 6861 | SetPageUptodate(page); |
5a3f23d5 | 6862 | |
257c62e1 CM |
6863 | BTRFS_I(inode)->last_trans = root->fs_info->generation; |
6864 | BTRFS_I(inode)->last_sub_trans = BTRFS_I(inode)->root->log_transid; | |
46d8bc34 | 6865 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->root->last_log_commit; |
257c62e1 | 6866 | |
2ac55d41 | 6867 | unlock_extent_cached(io_tree, page_start, page_end, &cached_state, GFP_NOFS); |
9ebefb18 CM |
6868 | |
6869 | out_unlock: | |
b2b5ef5c JK |
6870 | if (!ret) { |
6871 | sb_end_pagefault(inode->i_sb); | |
50a9b214 | 6872 | return VM_FAULT_LOCKED; |
b2b5ef5c | 6873 | } |
9ebefb18 | 6874 | unlock_page(page); |
1832a6d5 | 6875 | out: |
ec39e180 | 6876 | btrfs_delalloc_release_space(inode, PAGE_CACHE_SIZE); |
9998eb70 | 6877 | out_noreserve: |
b2b5ef5c | 6878 | sb_end_pagefault(inode->i_sb); |
9ebefb18 CM |
6879 | return ret; |
6880 | } | |
6881 | ||
a41ad394 | 6882 | static int btrfs_truncate(struct inode *inode) |
39279cc3 CM |
6883 | { |
6884 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
fcb80c2a | 6885 | struct btrfs_block_rsv *rsv; |
39279cc3 | 6886 | int ret; |
3893e33b | 6887 | int err = 0; |
39279cc3 | 6888 | struct btrfs_trans_handle *trans; |
dbe674a9 | 6889 | u64 mask = root->sectorsize - 1; |
07127184 | 6890 | u64 min_size = btrfs_calc_trunc_metadata_size(root, 1); |
39279cc3 | 6891 | |
2aaa6655 | 6892 | ret = btrfs_truncate_page(inode, inode->i_size, 0, 0); |
5d5e103a | 6893 | if (ret) |
a41ad394 | 6894 | return ret; |
8082510e | 6895 | |
4a096752 | 6896 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
8082510e | 6897 | btrfs_ordered_update_i_size(inode, inode->i_size, NULL); |
39279cc3 | 6898 | |
fcb80c2a JB |
6899 | /* |
6900 | * Yes ladies and gentelment, this is indeed ugly. The fact is we have | |
6901 | * 3 things going on here | |
6902 | * | |
6903 | * 1) We need to reserve space for our orphan item and the space to | |
6904 | * delete our orphan item. Lord knows we don't want to have a dangling | |
6905 | * orphan item because we didn't reserve space to remove it. | |
6906 | * | |
6907 | * 2) We need to reserve space to update our inode. | |
6908 | * | |
6909 | * 3) We need to have something to cache all the space that is going to | |
6910 | * be free'd up by the truncate operation, but also have some slack | |
6911 | * space reserved in case it uses space during the truncate (thank you | |
6912 | * very much snapshotting). | |
6913 | * | |
6914 | * And we need these to all be seperate. The fact is we can use alot of | |
6915 | * space doing the truncate, and we have no earthly idea how much space | |
6916 | * we will use, so we need the truncate reservation to be seperate so it | |
6917 | * doesn't end up using space reserved for updating the inode or | |
6918 | * removing the orphan item. We also need to be able to stop the | |
6919 | * transaction and start a new one, which means we need to be able to | |
6920 | * update the inode several times, and we have no idea of knowing how | |
6921 | * many times that will be, so we can't just reserve 1 item for the | |
6922 | * entirety of the opration, so that has to be done seperately as well. | |
6923 | * Then there is the orphan item, which does indeed need to be held on | |
6924 | * to for the whole operation, and we need nobody to touch this reserved | |
6925 | * space except the orphan code. | |
6926 | * | |
6927 | * So that leaves us with | |
6928 | * | |
6929 | * 1) root->orphan_block_rsv - for the orphan deletion. | |
6930 | * 2) rsv - for the truncate reservation, which we will steal from the | |
6931 | * transaction reservation. | |
6932 | * 3) fs_info->trans_block_rsv - this will have 1 items worth left for | |
6933 | * updating the inode. | |
6934 | */ | |
66d8f3dd | 6935 | rsv = btrfs_alloc_block_rsv(root, BTRFS_BLOCK_RSV_TEMP); |
fcb80c2a JB |
6936 | if (!rsv) |
6937 | return -ENOMEM; | |
4a338542 | 6938 | rsv->size = min_size; |
ca7e70f5 | 6939 | rsv->failfast = 1; |
f0cd846e | 6940 | |
907cbceb | 6941 | /* |
07127184 | 6942 | * 1 for the truncate slack space |
907cbceb JB |
6943 | * 1 for the orphan item we're going to add |
6944 | * 1 for the orphan item deletion | |
6945 | * 1 for updating the inode. | |
6946 | */ | |
fcb80c2a JB |
6947 | trans = btrfs_start_transaction(root, 4); |
6948 | if (IS_ERR(trans)) { | |
6949 | err = PTR_ERR(trans); | |
6950 | goto out; | |
6951 | } | |
f0cd846e | 6952 | |
907cbceb JB |
6953 | /* Migrate the slack space for the truncate to our reserve */ |
6954 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, rsv, | |
6955 | min_size); | |
fcb80c2a | 6956 | BUG_ON(ret); |
f0cd846e JB |
6957 | |
6958 | ret = btrfs_orphan_add(trans, inode); | |
6959 | if (ret) { | |
6960 | btrfs_end_transaction(trans, root); | |
fcb80c2a | 6961 | goto out; |
f0cd846e JB |
6962 | } |
6963 | ||
5a3f23d5 CM |
6964 | /* |
6965 | * setattr is responsible for setting the ordered_data_close flag, | |
6966 | * but that is only tested during the last file release. That | |
6967 | * could happen well after the next commit, leaving a great big | |
6968 | * window where new writes may get lost if someone chooses to write | |
6969 | * to this file after truncating to zero | |
6970 | * | |
6971 | * The inode doesn't have any dirty data here, and so if we commit | |
6972 | * this is a noop. If someone immediately starts writing to the inode | |
6973 | * it is very likely we'll catch some of their writes in this | |
6974 | * transaction, and the commit will find this file on the ordered | |
6975 | * data list with good things to send down. | |
6976 | * | |
6977 | * This is a best effort solution, there is still a window where | |
6978 | * using truncate to replace the contents of the file will | |
6979 | * end up with a zero length file after a crash. | |
6980 | */ | |
72ac3c0d JB |
6981 | if (inode->i_size == 0 && test_bit(BTRFS_INODE_ORDERED_DATA_CLOSE, |
6982 | &BTRFS_I(inode)->runtime_flags)) | |
5a3f23d5 CM |
6983 | btrfs_add_ordered_operation(trans, root, inode); |
6984 | ||
5dc562c5 JB |
6985 | /* |
6986 | * So if we truncate and then write and fsync we normally would just | |
6987 | * write the extents that changed, which is a problem if we need to | |
6988 | * first truncate that entire inode. So set this flag so we write out | |
6989 | * all of the extents in the inode to the sync log so we're completely | |
6990 | * safe. | |
6991 | */ | |
6992 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &BTRFS_I(inode)->runtime_flags); | |
ca7e70f5 | 6993 | trans->block_rsv = rsv; |
907cbceb | 6994 | |
8082510e YZ |
6995 | while (1) { |
6996 | ret = btrfs_truncate_inode_items(trans, root, inode, | |
6997 | inode->i_size, | |
6998 | BTRFS_EXTENT_DATA_KEY); | |
ca7e70f5 | 6999 | if (ret != -ENOSPC) { |
3893e33b | 7000 | err = ret; |
8082510e | 7001 | break; |
3893e33b | 7002 | } |
39279cc3 | 7003 | |
fcb80c2a | 7004 | trans->block_rsv = &root->fs_info->trans_block_rsv; |
8082510e | 7005 | ret = btrfs_update_inode(trans, root, inode); |
3893e33b JB |
7006 | if (ret) { |
7007 | err = ret; | |
7008 | break; | |
7009 | } | |
ca7e70f5 | 7010 | |
8082510e | 7011 | btrfs_end_transaction(trans, root); |
b53d3f5d | 7012 | btrfs_btree_balance_dirty(root); |
ca7e70f5 JB |
7013 | |
7014 | trans = btrfs_start_transaction(root, 2); | |
7015 | if (IS_ERR(trans)) { | |
7016 | ret = err = PTR_ERR(trans); | |
7017 | trans = NULL; | |
7018 | break; | |
7019 | } | |
7020 | ||
7021 | ret = btrfs_block_rsv_migrate(&root->fs_info->trans_block_rsv, | |
7022 | rsv, min_size); | |
7023 | BUG_ON(ret); /* shouldn't happen */ | |
7024 | trans->block_rsv = rsv; | |
8082510e YZ |
7025 | } |
7026 | ||
7027 | if (ret == 0 && inode->i_nlink > 0) { | |
fcb80c2a | 7028 | trans->block_rsv = root->orphan_block_rsv; |
8082510e | 7029 | ret = btrfs_orphan_del(trans, inode); |
3893e33b JB |
7030 | if (ret) |
7031 | err = ret; | |
ded5db9d JB |
7032 | } else if (ret && inode->i_nlink > 0) { |
7033 | /* | |
7034 | * Failed to do the truncate, remove us from the in memory | |
7035 | * orphan list. | |
7036 | */ | |
7037 | ret = btrfs_orphan_del(NULL, inode); | |
8082510e YZ |
7038 | } |
7039 | ||
917c16b2 CM |
7040 | if (trans) { |
7041 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
7042 | ret = btrfs_update_inode(trans, root, inode); | |
7043 | if (ret && !err) | |
7044 | err = ret; | |
7b128766 | 7045 | |
7ad85bb7 | 7046 | ret = btrfs_end_transaction(trans, root); |
b53d3f5d | 7047 | btrfs_btree_balance_dirty(root); |
917c16b2 | 7048 | } |
fcb80c2a JB |
7049 | |
7050 | out: | |
7051 | btrfs_free_block_rsv(root, rsv); | |
7052 | ||
3893e33b JB |
7053 | if (ret && !err) |
7054 | err = ret; | |
a41ad394 | 7055 | |
3893e33b | 7056 | return err; |
39279cc3 CM |
7057 | } |
7058 | ||
d352ac68 CM |
7059 | /* |
7060 | * create a new subvolume directory/inode (helper for the ioctl). | |
7061 | */ | |
d2fb3437 | 7062 | int btrfs_create_subvol_root(struct btrfs_trans_handle *trans, |
d82a6f1d | 7063 | struct btrfs_root *new_root, u64 new_dirid) |
39279cc3 | 7064 | { |
39279cc3 | 7065 | struct inode *inode; |
76dda93c | 7066 | int err; |
00e4e6b3 | 7067 | u64 index = 0; |
39279cc3 | 7068 | |
12fc9d09 FA |
7069 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, |
7070 | new_dirid, new_dirid, | |
7071 | S_IFDIR | (~current_umask() & S_IRWXUGO), | |
7072 | &index); | |
54aa1f4d | 7073 | if (IS_ERR(inode)) |
f46b5a66 | 7074 | return PTR_ERR(inode); |
39279cc3 CM |
7075 | inode->i_op = &btrfs_dir_inode_operations; |
7076 | inode->i_fop = &btrfs_dir_file_operations; | |
7077 | ||
bfe86848 | 7078 | set_nlink(inode, 1); |
dbe674a9 | 7079 | btrfs_i_size_write(inode, 0); |
3b96362c | 7080 | |
76dda93c | 7081 | err = btrfs_update_inode(trans, new_root, inode); |
cb8e7090 | 7082 | |
76dda93c | 7083 | iput(inode); |
ce598979 | 7084 | return err; |
39279cc3 CM |
7085 | } |
7086 | ||
39279cc3 CM |
7087 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
7088 | { | |
7089 | struct btrfs_inode *ei; | |
2ead6ae7 | 7090 | struct inode *inode; |
39279cc3 CM |
7091 | |
7092 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
7093 | if (!ei) | |
7094 | return NULL; | |
2ead6ae7 YZ |
7095 | |
7096 | ei->root = NULL; | |
2ead6ae7 | 7097 | ei->generation = 0; |
15ee9bc7 | 7098 | ei->last_trans = 0; |
257c62e1 | 7099 | ei->last_sub_trans = 0; |
e02119d5 | 7100 | ei->logged_trans = 0; |
2ead6ae7 | 7101 | ei->delalloc_bytes = 0; |
2ead6ae7 YZ |
7102 | ei->disk_i_size = 0; |
7103 | ei->flags = 0; | |
7709cde3 | 7104 | ei->csum_bytes = 0; |
2ead6ae7 YZ |
7105 | ei->index_cnt = (u64)-1; |
7106 | ei->last_unlink_trans = 0; | |
46d8bc34 | 7107 | ei->last_log_commit = 0; |
2ead6ae7 | 7108 | |
9e0baf60 JB |
7109 | spin_lock_init(&ei->lock); |
7110 | ei->outstanding_extents = 0; | |
7111 | ei->reserved_extents = 0; | |
2ead6ae7 | 7112 | |
72ac3c0d | 7113 | ei->runtime_flags = 0; |
261507a0 | 7114 | ei->force_compress = BTRFS_COMPRESS_NONE; |
2ead6ae7 | 7115 | |
16cdcec7 MX |
7116 | ei->delayed_node = NULL; |
7117 | ||
2ead6ae7 | 7118 | inode = &ei->vfs_inode; |
a8067e02 | 7119 | extent_map_tree_init(&ei->extent_tree); |
f993c883 DS |
7120 | extent_io_tree_init(&ei->io_tree, &inode->i_data); |
7121 | extent_io_tree_init(&ei->io_failure_tree, &inode->i_data); | |
0b32f4bb JB |
7122 | ei->io_tree.track_uptodate = 1; |
7123 | ei->io_failure_tree.track_uptodate = 1; | |
b812ce28 | 7124 | atomic_set(&ei->sync_writers, 0); |
2ead6ae7 | 7125 | mutex_init(&ei->log_mutex); |
f248679e | 7126 | mutex_init(&ei->delalloc_mutex); |
e6dcd2dc | 7127 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
2ead6ae7 | 7128 | INIT_LIST_HEAD(&ei->delalloc_inodes); |
5a3f23d5 | 7129 | INIT_LIST_HEAD(&ei->ordered_operations); |
2ead6ae7 YZ |
7130 | RB_CLEAR_NODE(&ei->rb_node); |
7131 | ||
7132 | return inode; | |
39279cc3 CM |
7133 | } |
7134 | ||
fa0d7e3d NP |
7135 | static void btrfs_i_callback(struct rcu_head *head) |
7136 | { | |
7137 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
fa0d7e3d NP |
7138 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
7139 | } | |
7140 | ||
39279cc3 CM |
7141 | void btrfs_destroy_inode(struct inode *inode) |
7142 | { | |
e6dcd2dc | 7143 | struct btrfs_ordered_extent *ordered; |
5a3f23d5 CM |
7144 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7145 | ||
b3d9b7a3 | 7146 | WARN_ON(!hlist_empty(&inode->i_dentry)); |
39279cc3 | 7147 | WARN_ON(inode->i_data.nrpages); |
9e0baf60 JB |
7148 | WARN_ON(BTRFS_I(inode)->outstanding_extents); |
7149 | WARN_ON(BTRFS_I(inode)->reserved_extents); | |
7709cde3 JB |
7150 | WARN_ON(BTRFS_I(inode)->delalloc_bytes); |
7151 | WARN_ON(BTRFS_I(inode)->csum_bytes); | |
39279cc3 | 7152 | |
a6dbd429 JB |
7153 | /* |
7154 | * This can happen where we create an inode, but somebody else also | |
7155 | * created the same inode and we need to destroy the one we already | |
7156 | * created. | |
7157 | */ | |
7158 | if (!root) | |
7159 | goto free; | |
7160 | ||
5a3f23d5 CM |
7161 | /* |
7162 | * Make sure we're properly removed from the ordered operation | |
7163 | * lists. | |
7164 | */ | |
7165 | smp_mb(); | |
7166 | if (!list_empty(&BTRFS_I(inode)->ordered_operations)) { | |
7167 | spin_lock(&root->fs_info->ordered_extent_lock); | |
7168 | list_del_init(&BTRFS_I(inode)->ordered_operations); | |
7169 | spin_unlock(&root->fs_info->ordered_extent_lock); | |
7170 | } | |
7171 | ||
8a35d95f JB |
7172 | if (test_bit(BTRFS_INODE_HAS_ORPHAN_ITEM, |
7173 | &BTRFS_I(inode)->runtime_flags)) { | |
33345d01 LZ |
7174 | printk(KERN_INFO "BTRFS: inode %llu still on the orphan list\n", |
7175 | (unsigned long long)btrfs_ino(inode)); | |
8a35d95f | 7176 | atomic_dec(&root->orphan_inodes); |
7b128766 | 7177 | } |
7b128766 | 7178 | |
d397712b | 7179 | while (1) { |
e6dcd2dc CM |
7180 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); |
7181 | if (!ordered) | |
7182 | break; | |
7183 | else { | |
d397712b CM |
7184 | printk(KERN_ERR "btrfs found ordered " |
7185 | "extent %llu %llu on inode cleanup\n", | |
7186 | (unsigned long long)ordered->file_offset, | |
7187 | (unsigned long long)ordered->len); | |
e6dcd2dc CM |
7188 | btrfs_remove_ordered_extent(inode, ordered); |
7189 | btrfs_put_ordered_extent(ordered); | |
7190 | btrfs_put_ordered_extent(ordered); | |
7191 | } | |
7192 | } | |
5d4f98a2 | 7193 | inode_tree_del(inode); |
5b21f2ed | 7194 | btrfs_drop_extent_cache(inode, 0, (u64)-1, 0); |
a6dbd429 | 7195 | free: |
16cdcec7 | 7196 | btrfs_remove_delayed_node(inode); |
fa0d7e3d | 7197 | call_rcu(&inode->i_rcu, btrfs_i_callback); |
39279cc3 CM |
7198 | } |
7199 | ||
45321ac5 | 7200 | int btrfs_drop_inode(struct inode *inode) |
76dda93c YZ |
7201 | { |
7202 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
45321ac5 | 7203 | |
0af3d00b | 7204 | if (btrfs_root_refs(&root->root_item) == 0 && |
83eea1f1 | 7205 | !btrfs_is_free_space_inode(inode)) |
45321ac5 | 7206 | return 1; |
76dda93c | 7207 | else |
45321ac5 | 7208 | return generic_drop_inode(inode); |
76dda93c YZ |
7209 | } |
7210 | ||
0ee0fda0 | 7211 | static void init_once(void *foo) |
39279cc3 CM |
7212 | { |
7213 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
7214 | ||
7215 | inode_init_once(&ei->vfs_inode); | |
7216 | } | |
7217 | ||
7218 | void btrfs_destroy_cachep(void) | |
7219 | { | |
8c0a8537 KS |
7220 | /* |
7221 | * Make sure all delayed rcu free inodes are flushed before we | |
7222 | * destroy cache. | |
7223 | */ | |
7224 | rcu_barrier(); | |
39279cc3 CM |
7225 | if (btrfs_inode_cachep) |
7226 | kmem_cache_destroy(btrfs_inode_cachep); | |
7227 | if (btrfs_trans_handle_cachep) | |
7228 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
7229 | if (btrfs_transaction_cachep) | |
7230 | kmem_cache_destroy(btrfs_transaction_cachep); | |
39279cc3 CM |
7231 | if (btrfs_path_cachep) |
7232 | kmem_cache_destroy(btrfs_path_cachep); | |
dc89e982 JB |
7233 | if (btrfs_free_space_cachep) |
7234 | kmem_cache_destroy(btrfs_free_space_cachep); | |
8ccf6f19 MX |
7235 | if (btrfs_delalloc_work_cachep) |
7236 | kmem_cache_destroy(btrfs_delalloc_work_cachep); | |
39279cc3 CM |
7237 | } |
7238 | ||
7239 | int btrfs_init_cachep(void) | |
7240 | { | |
837e1972 | 7241 | btrfs_inode_cachep = kmem_cache_create("btrfs_inode", |
9601e3f6 CH |
7242 | sizeof(struct btrfs_inode), 0, |
7243 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, init_once); | |
39279cc3 CM |
7244 | if (!btrfs_inode_cachep) |
7245 | goto fail; | |
9601e3f6 | 7246 | |
837e1972 | 7247 | btrfs_trans_handle_cachep = kmem_cache_create("btrfs_trans_handle", |
9601e3f6 CH |
7248 | sizeof(struct btrfs_trans_handle), 0, |
7249 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
7250 | if (!btrfs_trans_handle_cachep) |
7251 | goto fail; | |
9601e3f6 | 7252 | |
837e1972 | 7253 | btrfs_transaction_cachep = kmem_cache_create("btrfs_transaction", |
9601e3f6 CH |
7254 | sizeof(struct btrfs_transaction), 0, |
7255 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
7256 | if (!btrfs_transaction_cachep) |
7257 | goto fail; | |
9601e3f6 | 7258 | |
837e1972 | 7259 | btrfs_path_cachep = kmem_cache_create("btrfs_path", |
9601e3f6 CH |
7260 | sizeof(struct btrfs_path), 0, |
7261 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
39279cc3 CM |
7262 | if (!btrfs_path_cachep) |
7263 | goto fail; | |
9601e3f6 | 7264 | |
837e1972 | 7265 | btrfs_free_space_cachep = kmem_cache_create("btrfs_free_space", |
dc89e982 JB |
7266 | sizeof(struct btrfs_free_space), 0, |
7267 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); | |
7268 | if (!btrfs_free_space_cachep) | |
7269 | goto fail; | |
7270 | ||
8ccf6f19 MX |
7271 | btrfs_delalloc_work_cachep = kmem_cache_create("btrfs_delalloc_work", |
7272 | sizeof(struct btrfs_delalloc_work), 0, | |
7273 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, | |
7274 | NULL); | |
7275 | if (!btrfs_delalloc_work_cachep) | |
7276 | goto fail; | |
7277 | ||
39279cc3 CM |
7278 | return 0; |
7279 | fail: | |
7280 | btrfs_destroy_cachep(); | |
7281 | return -ENOMEM; | |
7282 | } | |
7283 | ||
7284 | static int btrfs_getattr(struct vfsmount *mnt, | |
7285 | struct dentry *dentry, struct kstat *stat) | |
7286 | { | |
7287 | struct inode *inode = dentry->d_inode; | |
fadc0d8b DS |
7288 | u32 blocksize = inode->i_sb->s_blocksize; |
7289 | ||
39279cc3 | 7290 | generic_fillattr(inode, stat); |
0ee5dc67 | 7291 | stat->dev = BTRFS_I(inode)->root->anon_dev; |
d6667462 | 7292 | stat->blksize = PAGE_CACHE_SIZE; |
fadc0d8b DS |
7293 | stat->blocks = (ALIGN(inode_get_bytes(inode), blocksize) + |
7294 | ALIGN(BTRFS_I(inode)->delalloc_bytes, blocksize)) >> 9; | |
39279cc3 CM |
7295 | return 0; |
7296 | } | |
7297 | ||
75e7cb7f LB |
7298 | /* |
7299 | * If a file is moved, it will inherit the cow and compression flags of the new | |
7300 | * directory. | |
7301 | */ | |
7302 | static void fixup_inode_flags(struct inode *dir, struct inode *inode) | |
7303 | { | |
7304 | struct btrfs_inode *b_dir = BTRFS_I(dir); | |
7305 | struct btrfs_inode *b_inode = BTRFS_I(inode); | |
7306 | ||
7307 | if (b_dir->flags & BTRFS_INODE_NODATACOW) | |
7308 | b_inode->flags |= BTRFS_INODE_NODATACOW; | |
7309 | else | |
7310 | b_inode->flags &= ~BTRFS_INODE_NODATACOW; | |
7311 | ||
bc178237 | 7312 | if (b_dir->flags & BTRFS_INODE_COMPRESS) { |
75e7cb7f | 7313 | b_inode->flags |= BTRFS_INODE_COMPRESS; |
bc178237 LB |
7314 | b_inode->flags &= ~BTRFS_INODE_NOCOMPRESS; |
7315 | } else { | |
7316 | b_inode->flags &= ~(BTRFS_INODE_COMPRESS | | |
7317 | BTRFS_INODE_NOCOMPRESS); | |
7318 | } | |
75e7cb7f LB |
7319 | } |
7320 | ||
d397712b CM |
7321 | static int btrfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
7322 | struct inode *new_dir, struct dentry *new_dentry) | |
39279cc3 CM |
7323 | { |
7324 | struct btrfs_trans_handle *trans; | |
7325 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
4df27c4d | 7326 | struct btrfs_root *dest = BTRFS_I(new_dir)->root; |
39279cc3 CM |
7327 | struct inode *new_inode = new_dentry->d_inode; |
7328 | struct inode *old_inode = old_dentry->d_inode; | |
7329 | struct timespec ctime = CURRENT_TIME; | |
00e4e6b3 | 7330 | u64 index = 0; |
4df27c4d | 7331 | u64 root_objectid; |
39279cc3 | 7332 | int ret; |
33345d01 | 7333 | u64 old_ino = btrfs_ino(old_inode); |
39279cc3 | 7334 | |
33345d01 | 7335 | if (btrfs_ino(new_dir) == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID) |
f679a840 YZ |
7336 | return -EPERM; |
7337 | ||
4df27c4d | 7338 | /* we only allow rename subvolume link between subvolumes */ |
33345d01 | 7339 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID && root != dest) |
3394e160 CM |
7340 | return -EXDEV; |
7341 | ||
33345d01 LZ |
7342 | if (old_ino == BTRFS_EMPTY_SUBVOL_DIR_OBJECTID || |
7343 | (new_inode && btrfs_ino(new_inode) == BTRFS_FIRST_FREE_OBJECTID)) | |
39279cc3 | 7344 | return -ENOTEMPTY; |
5f39d397 | 7345 | |
4df27c4d YZ |
7346 | if (S_ISDIR(old_inode->i_mode) && new_inode && |
7347 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) | |
7348 | return -ENOTEMPTY; | |
5a3f23d5 CM |
7349 | /* |
7350 | * we're using rename to replace one file with another. | |
7351 | * and the replacement file is large. Start IO on it now so | |
7352 | * we don't add too much work to the end of the transaction | |
7353 | */ | |
4baf8c92 | 7354 | if (new_inode && S_ISREG(old_inode->i_mode) && new_inode->i_size && |
5a3f23d5 CM |
7355 | old_inode->i_size > BTRFS_ORDERED_OPERATIONS_FLUSH_LIMIT) |
7356 | filemap_flush(old_inode->i_mapping); | |
7357 | ||
76dda93c | 7358 | /* close the racy window with snapshot create/destroy ioctl */ |
33345d01 | 7359 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 7360 | down_read(&root->fs_info->subvol_sem); |
a22285a6 YZ |
7361 | /* |
7362 | * We want to reserve the absolute worst case amount of items. So if | |
7363 | * both inodes are subvols and we need to unlink them then that would | |
7364 | * require 4 item modifications, but if they are both normal inodes it | |
7365 | * would require 5 item modifications, so we'll assume their normal | |
7366 | * inodes. So 5 * 2 is 10, plus 1 for the new link, so 11 total items | |
7367 | * should cover the worst case number of items we'll modify. | |
7368 | */ | |
7369 | trans = btrfs_start_transaction(root, 20); | |
b44c59a8 JL |
7370 | if (IS_ERR(trans)) { |
7371 | ret = PTR_ERR(trans); | |
7372 | goto out_notrans; | |
7373 | } | |
76dda93c | 7374 | |
4df27c4d YZ |
7375 | if (dest != root) |
7376 | btrfs_record_root_in_trans(trans, dest); | |
5f39d397 | 7377 | |
a5719521 YZ |
7378 | ret = btrfs_set_inode_index(new_dir, &index); |
7379 | if (ret) | |
7380 | goto out_fail; | |
5a3f23d5 | 7381 | |
33345d01 | 7382 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
7383 | /* force full log commit if subvolume involved. */ |
7384 | root->fs_info->last_trans_log_full_commit = trans->transid; | |
7385 | } else { | |
a5719521 YZ |
7386 | ret = btrfs_insert_inode_ref(trans, dest, |
7387 | new_dentry->d_name.name, | |
7388 | new_dentry->d_name.len, | |
33345d01 LZ |
7389 | old_ino, |
7390 | btrfs_ino(new_dir), index); | |
a5719521 YZ |
7391 | if (ret) |
7392 | goto out_fail; | |
4df27c4d YZ |
7393 | /* |
7394 | * this is an ugly little race, but the rename is required | |
7395 | * to make sure that if we crash, the inode is either at the | |
7396 | * old name or the new one. pinning the log transaction lets | |
7397 | * us make sure we don't allow a log commit to come in after | |
7398 | * we unlink the name but before we add the new name back in. | |
7399 | */ | |
7400 | btrfs_pin_log_trans(root); | |
7401 | } | |
5a3f23d5 CM |
7402 | /* |
7403 | * make sure the inode gets flushed if it is replacing | |
7404 | * something. | |
7405 | */ | |
33345d01 | 7406 | if (new_inode && new_inode->i_size && S_ISREG(old_inode->i_mode)) |
5a3f23d5 | 7407 | btrfs_add_ordered_operation(trans, root, old_inode); |
5a3f23d5 | 7408 | |
0c4d2d95 JB |
7409 | inode_inc_iversion(old_dir); |
7410 | inode_inc_iversion(new_dir); | |
7411 | inode_inc_iversion(old_inode); | |
39279cc3 CM |
7412 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
7413 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
7414 | old_inode->i_ctime = ctime; | |
5f39d397 | 7415 | |
12fcfd22 CM |
7416 | if (old_dentry->d_parent != new_dentry->d_parent) |
7417 | btrfs_record_unlink_dir(trans, old_dir, old_inode, 1); | |
7418 | ||
33345d01 | 7419 | if (unlikely(old_ino == BTRFS_FIRST_FREE_OBJECTID)) { |
4df27c4d YZ |
7420 | root_objectid = BTRFS_I(old_inode)->root->root_key.objectid; |
7421 | ret = btrfs_unlink_subvol(trans, root, old_dir, root_objectid, | |
7422 | old_dentry->d_name.name, | |
7423 | old_dentry->d_name.len); | |
7424 | } else { | |
92986796 AV |
7425 | ret = __btrfs_unlink_inode(trans, root, old_dir, |
7426 | old_dentry->d_inode, | |
7427 | old_dentry->d_name.name, | |
7428 | old_dentry->d_name.len); | |
7429 | if (!ret) | |
7430 | ret = btrfs_update_inode(trans, root, old_inode); | |
4df27c4d | 7431 | } |
79787eaa JM |
7432 | if (ret) { |
7433 | btrfs_abort_transaction(trans, root, ret); | |
7434 | goto out_fail; | |
7435 | } | |
39279cc3 CM |
7436 | |
7437 | if (new_inode) { | |
0c4d2d95 | 7438 | inode_inc_iversion(new_inode); |
39279cc3 | 7439 | new_inode->i_ctime = CURRENT_TIME; |
33345d01 | 7440 | if (unlikely(btrfs_ino(new_inode) == |
4df27c4d YZ |
7441 | BTRFS_EMPTY_SUBVOL_DIR_OBJECTID)) { |
7442 | root_objectid = BTRFS_I(new_inode)->location.objectid; | |
7443 | ret = btrfs_unlink_subvol(trans, dest, new_dir, | |
7444 | root_objectid, | |
7445 | new_dentry->d_name.name, | |
7446 | new_dentry->d_name.len); | |
7447 | BUG_ON(new_inode->i_nlink == 0); | |
7448 | } else { | |
7449 | ret = btrfs_unlink_inode(trans, dest, new_dir, | |
7450 | new_dentry->d_inode, | |
7451 | new_dentry->d_name.name, | |
7452 | new_dentry->d_name.len); | |
7453 | } | |
79787eaa | 7454 | if (!ret && new_inode->i_nlink == 0) { |
e02119d5 | 7455 | ret = btrfs_orphan_add(trans, new_dentry->d_inode); |
4df27c4d | 7456 | BUG_ON(ret); |
7b128766 | 7457 | } |
79787eaa JM |
7458 | if (ret) { |
7459 | btrfs_abort_transaction(trans, root, ret); | |
7460 | goto out_fail; | |
7461 | } | |
39279cc3 | 7462 | } |
aec7477b | 7463 | |
75e7cb7f LB |
7464 | fixup_inode_flags(new_dir, old_inode); |
7465 | ||
4df27c4d YZ |
7466 | ret = btrfs_add_link(trans, new_dir, old_inode, |
7467 | new_dentry->d_name.name, | |
a5719521 | 7468 | new_dentry->d_name.len, 0, index); |
79787eaa JM |
7469 | if (ret) { |
7470 | btrfs_abort_transaction(trans, root, ret); | |
7471 | goto out_fail; | |
7472 | } | |
39279cc3 | 7473 | |
33345d01 | 7474 | if (old_ino != BTRFS_FIRST_FREE_OBJECTID) { |
10d9f309 | 7475 | struct dentry *parent = new_dentry->d_parent; |
6a912213 | 7476 | btrfs_log_new_name(trans, old_inode, old_dir, parent); |
4df27c4d YZ |
7477 | btrfs_end_log_trans(root); |
7478 | } | |
39279cc3 | 7479 | out_fail: |
7ad85bb7 | 7480 | btrfs_end_transaction(trans, root); |
b44c59a8 | 7481 | out_notrans: |
33345d01 | 7482 | if (old_ino == BTRFS_FIRST_FREE_OBJECTID) |
76dda93c | 7483 | up_read(&root->fs_info->subvol_sem); |
9ed74f2d | 7484 | |
39279cc3 CM |
7485 | return ret; |
7486 | } | |
7487 | ||
8ccf6f19 MX |
7488 | static void btrfs_run_delalloc_work(struct btrfs_work *work) |
7489 | { | |
7490 | struct btrfs_delalloc_work *delalloc_work; | |
7491 | ||
7492 | delalloc_work = container_of(work, struct btrfs_delalloc_work, | |
7493 | work); | |
7494 | if (delalloc_work->wait) | |
7495 | btrfs_wait_ordered_range(delalloc_work->inode, 0, (u64)-1); | |
7496 | else | |
7497 | filemap_flush(delalloc_work->inode->i_mapping); | |
7498 | ||
7499 | if (delalloc_work->delay_iput) | |
7500 | btrfs_add_delayed_iput(delalloc_work->inode); | |
7501 | else | |
7502 | iput(delalloc_work->inode); | |
7503 | complete(&delalloc_work->completion); | |
7504 | } | |
7505 | ||
7506 | struct btrfs_delalloc_work *btrfs_alloc_delalloc_work(struct inode *inode, | |
7507 | int wait, int delay_iput) | |
7508 | { | |
7509 | struct btrfs_delalloc_work *work; | |
7510 | ||
7511 | work = kmem_cache_zalloc(btrfs_delalloc_work_cachep, GFP_NOFS); | |
7512 | if (!work) | |
7513 | return NULL; | |
7514 | ||
7515 | init_completion(&work->completion); | |
7516 | INIT_LIST_HEAD(&work->list); | |
7517 | work->inode = inode; | |
7518 | work->wait = wait; | |
7519 | work->delay_iput = delay_iput; | |
7520 | work->work.func = btrfs_run_delalloc_work; | |
7521 | ||
7522 | return work; | |
7523 | } | |
7524 | ||
7525 | void btrfs_wait_and_free_delalloc_work(struct btrfs_delalloc_work *work) | |
7526 | { | |
7527 | wait_for_completion(&work->completion); | |
7528 | kmem_cache_free(btrfs_delalloc_work_cachep, work); | |
7529 | } | |
7530 | ||
d352ac68 CM |
7531 | /* |
7532 | * some fairly slow code that needs optimization. This walks the list | |
7533 | * of all the inodes with pending delalloc and forces them to disk. | |
7534 | */ | |
24bbcf04 | 7535 | int btrfs_start_delalloc_inodes(struct btrfs_root *root, int delay_iput) |
ea8c2819 CM |
7536 | { |
7537 | struct list_head *head = &root->fs_info->delalloc_inodes; | |
7538 | struct btrfs_inode *binode; | |
5b21f2ed | 7539 | struct inode *inode; |
8ccf6f19 MX |
7540 | struct btrfs_delalloc_work *work, *next; |
7541 | struct list_head works; | |
7542 | int ret = 0; | |
ea8c2819 | 7543 | |
c146afad YZ |
7544 | if (root->fs_info->sb->s_flags & MS_RDONLY) |
7545 | return -EROFS; | |
7546 | ||
8ccf6f19 MX |
7547 | INIT_LIST_HEAD(&works); |
7548 | ||
75eff68e | 7549 | spin_lock(&root->fs_info->delalloc_lock); |
d397712b | 7550 | while (!list_empty(head)) { |
ea8c2819 CM |
7551 | binode = list_entry(head->next, struct btrfs_inode, |
7552 | delalloc_inodes); | |
5b21f2ed ZY |
7553 | inode = igrab(&binode->vfs_inode); |
7554 | if (!inode) | |
7555 | list_del_init(&binode->delalloc_inodes); | |
75eff68e | 7556 | spin_unlock(&root->fs_info->delalloc_lock); |
5b21f2ed | 7557 | if (inode) { |
8ccf6f19 MX |
7558 | work = btrfs_alloc_delalloc_work(inode, 0, delay_iput); |
7559 | if (!work) { | |
7560 | ret = -ENOMEM; | |
7561 | goto out; | |
7562 | } | |
7563 | list_add_tail(&work->list, &works); | |
7564 | btrfs_queue_worker(&root->fs_info->flush_workers, | |
7565 | &work->work); | |
5b21f2ed ZY |
7566 | } |
7567 | cond_resched(); | |
75eff68e | 7568 | spin_lock(&root->fs_info->delalloc_lock); |
ea8c2819 | 7569 | } |
75eff68e | 7570 | spin_unlock(&root->fs_info->delalloc_lock); |
8c8bee1d CM |
7571 | |
7572 | /* the filemap_flush will queue IO into the worker threads, but | |
7573 | * we have to make sure the IO is actually started and that | |
7574 | * ordered extents get created before we return | |
7575 | */ | |
7576 | atomic_inc(&root->fs_info->async_submit_draining); | |
d397712b | 7577 | while (atomic_read(&root->fs_info->nr_async_submits) || |
771ed689 | 7578 | atomic_read(&root->fs_info->async_delalloc_pages)) { |
8c8bee1d | 7579 | wait_event(root->fs_info->async_submit_wait, |
771ed689 CM |
7580 | (atomic_read(&root->fs_info->nr_async_submits) == 0 && |
7581 | atomic_read(&root->fs_info->async_delalloc_pages) == 0)); | |
8c8bee1d CM |
7582 | } |
7583 | atomic_dec(&root->fs_info->async_submit_draining); | |
8ccf6f19 MX |
7584 | out: |
7585 | list_for_each_entry_safe(work, next, &works, list) { | |
7586 | list_del_init(&work->list); | |
7587 | btrfs_wait_and_free_delalloc_work(work); | |
7588 | } | |
7589 | return ret; | |
ea8c2819 CM |
7590 | } |
7591 | ||
39279cc3 CM |
7592 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
7593 | const char *symname) | |
7594 | { | |
7595 | struct btrfs_trans_handle *trans; | |
7596 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
7597 | struct btrfs_path *path; | |
7598 | struct btrfs_key key; | |
1832a6d5 | 7599 | struct inode *inode = NULL; |
39279cc3 CM |
7600 | int err; |
7601 | int drop_inode = 0; | |
7602 | u64 objectid; | |
00e4e6b3 | 7603 | u64 index = 0 ; |
39279cc3 CM |
7604 | int name_len; |
7605 | int datasize; | |
5f39d397 | 7606 | unsigned long ptr; |
39279cc3 | 7607 | struct btrfs_file_extent_item *ei; |
5f39d397 | 7608 | struct extent_buffer *leaf; |
39279cc3 CM |
7609 | |
7610 | name_len = strlen(symname) + 1; | |
7611 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
7612 | return -ENAMETOOLONG; | |
1832a6d5 | 7613 | |
9ed74f2d JB |
7614 | /* |
7615 | * 2 items for inode item and ref | |
7616 | * 2 items for dir items | |
7617 | * 1 item for xattr if selinux is on | |
7618 | */ | |
a22285a6 YZ |
7619 | trans = btrfs_start_transaction(root, 5); |
7620 | if (IS_ERR(trans)) | |
7621 | return PTR_ERR(trans); | |
1832a6d5 | 7622 | |
581bb050 LZ |
7623 | err = btrfs_find_free_ino(root, &objectid); |
7624 | if (err) | |
7625 | goto out_unlock; | |
7626 | ||
aec7477b | 7627 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
33345d01 | 7628 | dentry->d_name.len, btrfs_ino(dir), objectid, |
d82a6f1d | 7629 | S_IFLNK|S_IRWXUGO, &index); |
7cf96da3 TI |
7630 | if (IS_ERR(inode)) { |
7631 | err = PTR_ERR(inode); | |
39279cc3 | 7632 | goto out_unlock; |
7cf96da3 | 7633 | } |
39279cc3 | 7634 | |
2a7dba39 | 7635 | err = btrfs_init_inode_security(trans, inode, dir, &dentry->d_name); |
33268eaf JB |
7636 | if (err) { |
7637 | drop_inode = 1; | |
7638 | goto out_unlock; | |
7639 | } | |
7640 | ||
ad19db71 CS |
7641 | /* |
7642 | * If the active LSM wants to access the inode during | |
7643 | * d_instantiate it needs these. Smack checks to see | |
7644 | * if the filesystem supports xattrs by looking at the | |
7645 | * ops vector. | |
7646 | */ | |
7647 | inode->i_fop = &btrfs_file_operations; | |
7648 | inode->i_op = &btrfs_file_inode_operations; | |
7649 | ||
a1b075d2 | 7650 | err = btrfs_add_nondir(trans, dir, dentry, inode, 0, index); |
39279cc3 CM |
7651 | if (err) |
7652 | drop_inode = 1; | |
7653 | else { | |
7654 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 7655 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 7656 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 | 7657 | } |
39279cc3 CM |
7658 | if (drop_inode) |
7659 | goto out_unlock; | |
7660 | ||
7661 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
7662 | if (!path) { |
7663 | err = -ENOMEM; | |
7664 | drop_inode = 1; | |
7665 | goto out_unlock; | |
7666 | } | |
33345d01 | 7667 | key.objectid = btrfs_ino(inode); |
39279cc3 | 7668 | key.offset = 0; |
39279cc3 CM |
7669 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
7670 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
7671 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
7672 | datasize); | |
54aa1f4d CM |
7673 | if (err) { |
7674 | drop_inode = 1; | |
b0839166 | 7675 | btrfs_free_path(path); |
54aa1f4d CM |
7676 | goto out_unlock; |
7677 | } | |
5f39d397 CM |
7678 | leaf = path->nodes[0]; |
7679 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
7680 | struct btrfs_file_extent_item); | |
7681 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
7682 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 | 7683 | BTRFS_FILE_EXTENT_INLINE); |
c8b97818 CM |
7684 | btrfs_set_file_extent_encryption(leaf, ei, 0); |
7685 | btrfs_set_file_extent_compression(leaf, ei, 0); | |
7686 | btrfs_set_file_extent_other_encoding(leaf, ei, 0); | |
7687 | btrfs_set_file_extent_ram_bytes(leaf, ei, name_len); | |
7688 | ||
39279cc3 | 7689 | ptr = btrfs_file_extent_inline_start(ei); |
5f39d397 CM |
7690 | write_extent_buffer(leaf, symname, ptr, name_len); |
7691 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 7692 | btrfs_free_path(path); |
5f39d397 | 7693 | |
39279cc3 CM |
7694 | inode->i_op = &btrfs_symlink_inode_operations; |
7695 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 7696 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d899e052 | 7697 | inode_set_bytes(inode, name_len); |
dbe674a9 | 7698 | btrfs_i_size_write(inode, name_len - 1); |
54aa1f4d CM |
7699 | err = btrfs_update_inode(trans, root, inode); |
7700 | if (err) | |
7701 | drop_inode = 1; | |
39279cc3 CM |
7702 | |
7703 | out_unlock: | |
08c422c2 AV |
7704 | if (!err) |
7705 | d_instantiate(dentry, inode); | |
7ad85bb7 | 7706 | btrfs_end_transaction(trans, root); |
39279cc3 CM |
7707 | if (drop_inode) { |
7708 | inode_dec_link_count(inode); | |
7709 | iput(inode); | |
7710 | } | |
b53d3f5d | 7711 | btrfs_btree_balance_dirty(root); |
39279cc3 CM |
7712 | return err; |
7713 | } | |
16432985 | 7714 | |
0af3d00b JB |
7715 | static int __btrfs_prealloc_file_range(struct inode *inode, int mode, |
7716 | u64 start, u64 num_bytes, u64 min_size, | |
7717 | loff_t actual_len, u64 *alloc_hint, | |
7718 | struct btrfs_trans_handle *trans) | |
d899e052 | 7719 | { |
5dc562c5 JB |
7720 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
7721 | struct extent_map *em; | |
d899e052 YZ |
7722 | struct btrfs_root *root = BTRFS_I(inode)->root; |
7723 | struct btrfs_key ins; | |
d899e052 | 7724 | u64 cur_offset = start; |
55a61d1d | 7725 | u64 i_size; |
d899e052 | 7726 | int ret = 0; |
0af3d00b | 7727 | bool own_trans = true; |
d899e052 | 7728 | |
0af3d00b JB |
7729 | if (trans) |
7730 | own_trans = false; | |
d899e052 | 7731 | while (num_bytes > 0) { |
0af3d00b JB |
7732 | if (own_trans) { |
7733 | trans = btrfs_start_transaction(root, 3); | |
7734 | if (IS_ERR(trans)) { | |
7735 | ret = PTR_ERR(trans); | |
7736 | break; | |
7737 | } | |
5a303d5d YZ |
7738 | } |
7739 | ||
efa56464 | 7740 | ret = btrfs_reserve_extent(trans, root, num_bytes, min_size, |
81c9ad23 | 7741 | 0, *alloc_hint, &ins, 1); |
5a303d5d | 7742 | if (ret) { |
0af3d00b JB |
7743 | if (own_trans) |
7744 | btrfs_end_transaction(trans, root); | |
a22285a6 | 7745 | break; |
d899e052 | 7746 | } |
5a303d5d | 7747 | |
d899e052 YZ |
7748 | ret = insert_reserved_file_extent(trans, inode, |
7749 | cur_offset, ins.objectid, | |
7750 | ins.offset, ins.offset, | |
920bbbfb | 7751 | ins.offset, 0, 0, 0, |
d899e052 | 7752 | BTRFS_FILE_EXTENT_PREALLOC); |
79787eaa JM |
7753 | if (ret) { |
7754 | btrfs_abort_transaction(trans, root, ret); | |
7755 | if (own_trans) | |
7756 | btrfs_end_transaction(trans, root); | |
7757 | break; | |
7758 | } | |
a1ed835e CM |
7759 | btrfs_drop_extent_cache(inode, cur_offset, |
7760 | cur_offset + ins.offset -1, 0); | |
5a303d5d | 7761 | |
5dc562c5 JB |
7762 | em = alloc_extent_map(); |
7763 | if (!em) { | |
7764 | set_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
7765 | &BTRFS_I(inode)->runtime_flags); | |
7766 | goto next; | |
7767 | } | |
7768 | ||
7769 | em->start = cur_offset; | |
7770 | em->orig_start = cur_offset; | |
7771 | em->len = ins.offset; | |
7772 | em->block_start = ins.objectid; | |
7773 | em->block_len = ins.offset; | |
7774 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
7775 | set_bit(EXTENT_FLAG_PREALLOC, &em->flags); | |
7776 | em->generation = trans->transid; | |
7777 | ||
7778 | while (1) { | |
7779 | write_lock(&em_tree->lock); | |
7780 | ret = add_extent_mapping(em_tree, em); | |
7781 | if (!ret) | |
7782 | list_move(&em->list, | |
7783 | &em_tree->modified_extents); | |
7784 | write_unlock(&em_tree->lock); | |
7785 | if (ret != -EEXIST) | |
7786 | break; | |
7787 | btrfs_drop_extent_cache(inode, cur_offset, | |
7788 | cur_offset + ins.offset - 1, | |
7789 | 0); | |
7790 | } | |
7791 | free_extent_map(em); | |
7792 | next: | |
d899e052 YZ |
7793 | num_bytes -= ins.offset; |
7794 | cur_offset += ins.offset; | |
efa56464 | 7795 | *alloc_hint = ins.objectid + ins.offset; |
5a303d5d | 7796 | |
0c4d2d95 | 7797 | inode_inc_iversion(inode); |
d899e052 | 7798 | inode->i_ctime = CURRENT_TIME; |
6cbff00f | 7799 | BTRFS_I(inode)->flags |= BTRFS_INODE_PREALLOC; |
d899e052 | 7800 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
efa56464 YZ |
7801 | (actual_len > inode->i_size) && |
7802 | (cur_offset > inode->i_size)) { | |
d1ea6a61 | 7803 | if (cur_offset > actual_len) |
55a61d1d | 7804 | i_size = actual_len; |
d1ea6a61 | 7805 | else |
55a61d1d JB |
7806 | i_size = cur_offset; |
7807 | i_size_write(inode, i_size); | |
7808 | btrfs_ordered_update_i_size(inode, i_size, NULL); | |
5a303d5d YZ |
7809 | } |
7810 | ||
d899e052 | 7811 | ret = btrfs_update_inode(trans, root, inode); |
79787eaa JM |
7812 | |
7813 | if (ret) { | |
7814 | btrfs_abort_transaction(trans, root, ret); | |
7815 | if (own_trans) | |
7816 | btrfs_end_transaction(trans, root); | |
7817 | break; | |
7818 | } | |
d899e052 | 7819 | |
0af3d00b JB |
7820 | if (own_trans) |
7821 | btrfs_end_transaction(trans, root); | |
5a303d5d | 7822 | } |
d899e052 YZ |
7823 | return ret; |
7824 | } | |
7825 | ||
0af3d00b JB |
7826 | int btrfs_prealloc_file_range(struct inode *inode, int mode, |
7827 | u64 start, u64 num_bytes, u64 min_size, | |
7828 | loff_t actual_len, u64 *alloc_hint) | |
7829 | { | |
7830 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
7831 | min_size, actual_len, alloc_hint, | |
7832 | NULL); | |
7833 | } | |
7834 | ||
7835 | int btrfs_prealloc_file_range_trans(struct inode *inode, | |
7836 | struct btrfs_trans_handle *trans, int mode, | |
7837 | u64 start, u64 num_bytes, u64 min_size, | |
7838 | loff_t actual_len, u64 *alloc_hint) | |
7839 | { | |
7840 | return __btrfs_prealloc_file_range(inode, mode, start, num_bytes, | |
7841 | min_size, actual_len, alloc_hint, trans); | |
7842 | } | |
7843 | ||
e6dcd2dc CM |
7844 | static int btrfs_set_page_dirty(struct page *page) |
7845 | { | |
e6dcd2dc CM |
7846 | return __set_page_dirty_nobuffers(page); |
7847 | } | |
7848 | ||
10556cb2 | 7849 | static int btrfs_permission(struct inode *inode, int mask) |
fdebe2bd | 7850 | { |
b83cc969 | 7851 | struct btrfs_root *root = BTRFS_I(inode)->root; |
cb6db4e5 | 7852 | umode_t mode = inode->i_mode; |
b83cc969 | 7853 | |
cb6db4e5 JM |
7854 | if (mask & MAY_WRITE && |
7855 | (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))) { | |
7856 | if (btrfs_root_readonly(root)) | |
7857 | return -EROFS; | |
7858 | if (BTRFS_I(inode)->flags & BTRFS_INODE_READONLY) | |
7859 | return -EACCES; | |
7860 | } | |
2830ba7f | 7861 | return generic_permission(inode, mask); |
fdebe2bd | 7862 | } |
39279cc3 | 7863 | |
6e1d5dcc | 7864 | static const struct inode_operations btrfs_dir_inode_operations = { |
3394e160 | 7865 | .getattr = btrfs_getattr, |
39279cc3 CM |
7866 | .lookup = btrfs_lookup, |
7867 | .create = btrfs_create, | |
7868 | .unlink = btrfs_unlink, | |
7869 | .link = btrfs_link, | |
7870 | .mkdir = btrfs_mkdir, | |
7871 | .rmdir = btrfs_rmdir, | |
7872 | .rename = btrfs_rename, | |
7873 | .symlink = btrfs_symlink, | |
7874 | .setattr = btrfs_setattr, | |
618e21d5 | 7875 | .mknod = btrfs_mknod, |
95819c05 CH |
7876 | .setxattr = btrfs_setxattr, |
7877 | .getxattr = btrfs_getxattr, | |
5103e947 | 7878 | .listxattr = btrfs_listxattr, |
95819c05 | 7879 | .removexattr = btrfs_removexattr, |
fdebe2bd | 7880 | .permission = btrfs_permission, |
4e34e719 | 7881 | .get_acl = btrfs_get_acl, |
39279cc3 | 7882 | }; |
6e1d5dcc | 7883 | static const struct inode_operations btrfs_dir_ro_inode_operations = { |
39279cc3 | 7884 | .lookup = btrfs_lookup, |
fdebe2bd | 7885 | .permission = btrfs_permission, |
4e34e719 | 7886 | .get_acl = btrfs_get_acl, |
39279cc3 | 7887 | }; |
76dda93c | 7888 | |
828c0950 | 7889 | static const struct file_operations btrfs_dir_file_operations = { |
39279cc3 CM |
7890 | .llseek = generic_file_llseek, |
7891 | .read = generic_read_dir, | |
cbdf5a24 | 7892 | .readdir = btrfs_real_readdir, |
34287aa3 | 7893 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 7894 | #ifdef CONFIG_COMPAT |
34287aa3 | 7895 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 7896 | #endif |
6bf13c0c | 7897 | .release = btrfs_release_file, |
e02119d5 | 7898 | .fsync = btrfs_sync_file, |
39279cc3 CM |
7899 | }; |
7900 | ||
d1310b2e | 7901 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 7902 | .fill_delalloc = run_delalloc_range, |
065631f6 | 7903 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 7904 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac | 7905 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
e6dcd2dc | 7906 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 7907 | .writepage_start_hook = btrfs_writepage_start_hook, |
b0c68f8b CM |
7908 | .set_bit_hook = btrfs_set_bit_hook, |
7909 | .clear_bit_hook = btrfs_clear_bit_hook, | |
9ed74f2d JB |
7910 | .merge_extent_hook = btrfs_merge_extent_hook, |
7911 | .split_extent_hook = btrfs_split_extent_hook, | |
07157aac CM |
7912 | }; |
7913 | ||
35054394 CM |
7914 | /* |
7915 | * btrfs doesn't support the bmap operation because swapfiles | |
7916 | * use bmap to make a mapping of extents in the file. They assume | |
7917 | * these extents won't change over the life of the file and they | |
7918 | * use the bmap result to do IO directly to the drive. | |
7919 | * | |
7920 | * the btrfs bmap call would return logical addresses that aren't | |
7921 | * suitable for IO and they also will change frequently as COW | |
7922 | * operations happen. So, swapfile + btrfs == corruption. | |
7923 | * | |
7924 | * For now we're avoiding this by dropping bmap. | |
7925 | */ | |
7f09410b | 7926 | static const struct address_space_operations btrfs_aops = { |
39279cc3 CM |
7927 | .readpage = btrfs_readpage, |
7928 | .writepage = btrfs_writepage, | |
b293f02e | 7929 | .writepages = btrfs_writepages, |
3ab2fb5a | 7930 | .readpages = btrfs_readpages, |
16432985 | 7931 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
7932 | .invalidatepage = btrfs_invalidatepage, |
7933 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 7934 | .set_page_dirty = btrfs_set_page_dirty, |
465fdd97 | 7935 | .error_remove_page = generic_error_remove_page, |
39279cc3 CM |
7936 | }; |
7937 | ||
7f09410b | 7938 | static const struct address_space_operations btrfs_symlink_aops = { |
39279cc3 CM |
7939 | .readpage = btrfs_readpage, |
7940 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
7941 | .invalidatepage = btrfs_invalidatepage, |
7942 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
7943 | }; |
7944 | ||
6e1d5dcc | 7945 | static const struct inode_operations btrfs_file_inode_operations = { |
39279cc3 CM |
7946 | .getattr = btrfs_getattr, |
7947 | .setattr = btrfs_setattr, | |
95819c05 CH |
7948 | .setxattr = btrfs_setxattr, |
7949 | .getxattr = btrfs_getxattr, | |
5103e947 | 7950 | .listxattr = btrfs_listxattr, |
95819c05 | 7951 | .removexattr = btrfs_removexattr, |
fdebe2bd | 7952 | .permission = btrfs_permission, |
1506fcc8 | 7953 | .fiemap = btrfs_fiemap, |
4e34e719 | 7954 | .get_acl = btrfs_get_acl, |
e41f941a | 7955 | .update_time = btrfs_update_time, |
39279cc3 | 7956 | }; |
6e1d5dcc | 7957 | static const struct inode_operations btrfs_special_inode_operations = { |
618e21d5 JB |
7958 | .getattr = btrfs_getattr, |
7959 | .setattr = btrfs_setattr, | |
fdebe2bd | 7960 | .permission = btrfs_permission, |
95819c05 CH |
7961 | .setxattr = btrfs_setxattr, |
7962 | .getxattr = btrfs_getxattr, | |
33268eaf | 7963 | .listxattr = btrfs_listxattr, |
95819c05 | 7964 | .removexattr = btrfs_removexattr, |
4e34e719 | 7965 | .get_acl = btrfs_get_acl, |
e41f941a | 7966 | .update_time = btrfs_update_time, |
618e21d5 | 7967 | }; |
6e1d5dcc | 7968 | static const struct inode_operations btrfs_symlink_inode_operations = { |
39279cc3 CM |
7969 | .readlink = generic_readlink, |
7970 | .follow_link = page_follow_link_light, | |
7971 | .put_link = page_put_link, | |
f209561a | 7972 | .getattr = btrfs_getattr, |
22c44fe6 | 7973 | .setattr = btrfs_setattr, |
fdebe2bd | 7974 | .permission = btrfs_permission, |
0279b4cd JO |
7975 | .setxattr = btrfs_setxattr, |
7976 | .getxattr = btrfs_getxattr, | |
7977 | .listxattr = btrfs_listxattr, | |
7978 | .removexattr = btrfs_removexattr, | |
4e34e719 | 7979 | .get_acl = btrfs_get_acl, |
e41f941a | 7980 | .update_time = btrfs_update_time, |
39279cc3 | 7981 | }; |
76dda93c | 7982 | |
82d339d9 | 7983 | const struct dentry_operations btrfs_dentry_operations = { |
76dda93c | 7984 | .d_delete = btrfs_dentry_delete, |
b4aff1f8 | 7985 | .d_release = btrfs_dentry_release, |
76dda93c | 7986 | }; |