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 | ||
39279cc3 CM |
19 | #include <linux/buffer_head.h> |
20 | #include <linux/fs.h> | |
21 | #include <linux/pagemap.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/time.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/string.h> | |
26 | #include <linux/smp_lock.h> | |
27 | #include <linux/backing-dev.h> | |
28 | #include <linux/mpage.h> | |
29 | #include <linux/swap.h> | |
30 | #include <linux/writeback.h> | |
31 | #include <linux/statfs.h> | |
32 | #include <linux/compat.h> | |
9ebefb18 | 33 | #include <linux/bit_spinlock.h> |
92fee66d | 34 | #include <linux/version.h> |
5103e947 | 35 | #include <linux/xattr.h> |
39279cc3 CM |
36 | #include "ctree.h" |
37 | #include "disk-io.h" | |
38 | #include "transaction.h" | |
39 | #include "btrfs_inode.h" | |
40 | #include "ioctl.h" | |
41 | #include "print-tree.h" | |
42 | ||
43 | struct btrfs_iget_args { | |
44 | u64 ino; | |
45 | struct btrfs_root *root; | |
46 | }; | |
47 | ||
48 | static struct inode_operations btrfs_dir_inode_operations; | |
49 | static struct inode_operations btrfs_symlink_inode_operations; | |
50 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 51 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
52 | static struct inode_operations btrfs_file_inode_operations; |
53 | static struct address_space_operations btrfs_aops; | |
54 | static struct address_space_operations btrfs_symlink_aops; | |
55 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 56 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
57 | |
58 | static struct kmem_cache *btrfs_inode_cachep; | |
59 | struct kmem_cache *btrfs_trans_handle_cachep; | |
60 | struct kmem_cache *btrfs_transaction_cachep; | |
61 | struct kmem_cache *btrfs_bit_radix_cachep; | |
62 | struct kmem_cache *btrfs_path_cachep; | |
63 | ||
64 | #define S_SHIFT 12 | |
65 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
66 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
67 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
68 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
69 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
70 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
71 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
72 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
73 | }; | |
74 | ||
1832a6d5 CM |
75 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
76 | int for_del) | |
77 | { | |
78 | u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
79 | u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
80 | u64 thresh; | |
81 | int ret = 0; | |
82 | ||
83 | if (for_del) | |
f9ef6604 | 84 | thresh = total * 90; |
1832a6d5 | 85 | else |
f9ef6604 CM |
86 | thresh = total * 85; |
87 | ||
88 | do_div(thresh, 100); | |
1832a6d5 CM |
89 | |
90 | spin_lock(&root->fs_info->delalloc_lock); | |
91 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
92 | ret = -ENOSPC; | |
93 | spin_unlock(&root->fs_info->delalloc_lock); | |
94 | return ret; | |
95 | } | |
96 | ||
be20aa9d | 97 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
98 | { |
99 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
100 | struct btrfs_trans_handle *trans; | |
b888db2b | 101 | u64 alloc_hint = 0; |
db94535d | 102 | u64 num_bytes; |
c59f8951 | 103 | u64 cur_alloc_size; |
db94535d | 104 | u64 blocksize = root->sectorsize; |
d1310b2e CM |
105 | u64 orig_start = start; |
106 | u64 orig_num_bytes; | |
be20aa9d CM |
107 | struct btrfs_key ins; |
108 | int ret; | |
b888db2b | 109 | |
b888db2b | 110 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 111 | BUG_ON(!trans); |
be20aa9d CM |
112 | btrfs_set_trans_block_group(trans, inode); |
113 | ||
db94535d | 114 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 115 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 116 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 117 | start, start + num_bytes, start, &alloc_hint); |
d1310b2e | 118 | orig_num_bytes = num_bytes; |
db94535d | 119 | |
179e29e4 CM |
120 | if (alloc_hint == EXTENT_MAP_INLINE) |
121 | goto out; | |
122 | ||
c59f8951 CM |
123 | while(num_bytes > 0) { |
124 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
125 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
126 | root->root_key.objectid, | |
127 | trans->transid, | |
128 | inode->i_ino, start, 0, | |
129 | alloc_hint, (u64)-1, &ins, 1); | |
130 | if (ret) { | |
131 | WARN_ON(1); | |
132 | goto out; | |
133 | } | |
134 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
135 | start, ins.objectid, ins.offset, | |
136 | ins.offset); | |
5f56406a | 137 | btrfs_check_file(root, inode); |
c59f8951 CM |
138 | num_bytes -= cur_alloc_size; |
139 | alloc_hint = ins.objectid + ins.offset; | |
140 | start += cur_alloc_size; | |
b888db2b | 141 | } |
d1310b2e CM |
142 | btrfs_drop_extent_cache(inode, orig_start, |
143 | orig_start + orig_num_bytes - 1); | |
dc17ff8f | 144 | btrfs_add_ordered_inode(inode); |
b888db2b CM |
145 | out: |
146 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
147 | return ret; |
148 | } | |
149 | ||
150 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
151 | { | |
152 | u64 extent_start; | |
153 | u64 extent_end; | |
154 | u64 bytenr; | |
155 | u64 cow_end; | |
1832a6d5 | 156 | u64 loops = 0; |
c31f8830 | 157 | u64 total_fs_bytes; |
be20aa9d CM |
158 | struct btrfs_root *root = BTRFS_I(inode)->root; |
159 | struct extent_buffer *leaf; | |
160 | int found_type; | |
161 | struct btrfs_path *path; | |
162 | struct btrfs_file_extent_item *item; | |
163 | int ret; | |
164 | int err; | |
165 | struct btrfs_key found_key; | |
166 | ||
c31f8830 | 167 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
168 | path = btrfs_alloc_path(); |
169 | BUG_ON(!path); | |
170 | again: | |
171 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
172 | inode->i_ino, start, 0); | |
173 | if (ret < 0) { | |
174 | btrfs_free_path(path); | |
175 | return ret; | |
176 | } | |
177 | ||
178 | cow_end = end; | |
179 | if (ret != 0) { | |
180 | if (path->slots[0] == 0) | |
181 | goto not_found; | |
182 | path->slots[0]--; | |
183 | } | |
184 | ||
185 | leaf = path->nodes[0]; | |
186 | item = btrfs_item_ptr(leaf, path->slots[0], | |
187 | struct btrfs_file_extent_item); | |
188 | ||
189 | /* are we inside the extent that was found? */ | |
190 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
191 | found_type = btrfs_key_type(&found_key); | |
192 | if (found_key.objectid != inode->i_ino || | |
193 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
194 | goto not_found; | |
195 | } | |
196 | ||
197 | found_type = btrfs_file_extent_type(leaf, item); | |
198 | extent_start = found_key.offset; | |
199 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
200 | u64 extent_num_bytes; |
201 | ||
202 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
203 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
204 | err = 0; |
205 | ||
1832a6d5 CM |
206 | if (loops && start != extent_start) |
207 | goto not_found; | |
208 | ||
be20aa9d CM |
209 | if (start < extent_start || start >= extent_end) |
210 | goto not_found; | |
211 | ||
212 | cow_end = min(end, extent_end - 1); | |
213 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
214 | if (bytenr == 0) | |
215 | goto not_found; | |
216 | ||
c31f8830 CM |
217 | /* |
218 | * we may be called by the resizer, make sure we're inside | |
219 | * the limits of the FS | |
220 | */ | |
221 | if (bytenr + extent_num_bytes > total_fs_bytes) | |
222 | goto not_found; | |
223 | ||
be20aa9d CM |
224 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
225 | goto not_found; | |
226 | } | |
227 | ||
228 | start = extent_end; | |
bd09835d | 229 | } else { |
be20aa9d CM |
230 | goto not_found; |
231 | } | |
232 | loop: | |
233 | if (start > end) { | |
234 | btrfs_free_path(path); | |
235 | return 0; | |
236 | } | |
237 | btrfs_release_path(root, path); | |
1832a6d5 | 238 | loops++; |
be20aa9d CM |
239 | goto again; |
240 | ||
241 | not_found: | |
242 | cow_file_range(inode, start, cow_end); | |
243 | start = cow_end + 1; | |
244 | goto loop; | |
245 | } | |
246 | ||
247 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
248 | { | |
249 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
250 | int ret; | |
be20aa9d | 251 | mutex_lock(&root->fs_info->fs_mutex); |
b98b6767 Y |
252 | if (btrfs_test_opt(root, NODATACOW) || |
253 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
254 | ret = run_delalloc_nocow(inode, start, end); |
255 | else | |
256 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 257 | |
b888db2b CM |
258 | mutex_unlock(&root->fs_info->fs_mutex); |
259 | return ret; | |
260 | } | |
261 | ||
291d673e CM |
262 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
263 | unsigned long bits) | |
264 | { | |
265 | if ((bits & EXTENT_DELALLOC)) { | |
266 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
267 | spin_lock(&root->fs_info->delalloc_lock); | |
268 | root->fs_info->delalloc_bytes += end - start + 1; | |
269 | spin_unlock(&root->fs_info->delalloc_lock); | |
270 | } | |
271 | return 0; | |
272 | } | |
273 | ||
274 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
275 | unsigned long bits) | |
276 | { | |
277 | if ((bits & EXTENT_DELALLOC)) { | |
278 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
279 | spin_lock(&root->fs_info->delalloc_lock); | |
280 | root->fs_info->delalloc_bytes -= end - start + 1; | |
281 | spin_unlock(&root->fs_info->delalloc_lock); | |
282 | } | |
283 | return 0; | |
284 | } | |
285 | ||
07157aac CM |
286 | int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end) |
287 | { | |
288 | struct inode *inode = page->mapping->host; | |
289 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
290 | struct btrfs_trans_handle *trans; | |
291 | char *kaddr; | |
b6cda9bc | 292 | int ret = 0; |
35ebb934 | 293 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
07157aac | 294 | size_t offset = start - page_start; |
b98b6767 Y |
295 | if (btrfs_test_opt(root, NODATASUM) || |
296 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 297 | return 0; |
07157aac CM |
298 | mutex_lock(&root->fs_info->fs_mutex); |
299 | trans = btrfs_start_transaction(root, 1); | |
300 | btrfs_set_trans_block_group(trans, inode); | |
301 | kaddr = kmap(page); | |
f578d4bd | 302 | btrfs_csum_file_block(trans, root, inode, inode->i_ino, |
07157aac CM |
303 | start, kaddr + offset, end - start + 1); |
304 | kunmap(page); | |
305 | ret = btrfs_end_transaction(trans, root); | |
306 | BUG_ON(ret); | |
307 | mutex_unlock(&root->fs_info->fs_mutex); | |
308 | return ret; | |
309 | } | |
310 | ||
311 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) | |
312 | { | |
313 | int ret = 0; | |
314 | struct inode *inode = page->mapping->host; | |
315 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 316 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
317 | struct btrfs_csum_item *item; |
318 | struct btrfs_path *path = NULL; | |
ff79f819 | 319 | u32 csum; |
b98b6767 Y |
320 | if (btrfs_test_opt(root, NODATASUM) || |
321 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 322 | return 0; |
07157aac CM |
323 | mutex_lock(&root->fs_info->fs_mutex); |
324 | path = btrfs_alloc_path(); | |
325 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
326 | if (IS_ERR(item)) { | |
327 | ret = PTR_ERR(item); | |
328 | /* a csum that isn't present is a preallocated region. */ | |
329 | if (ret == -ENOENT || ret == -EFBIG) | |
330 | ret = 0; | |
ff79f819 | 331 | csum = 0; |
aadfeb6e | 332 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start); |
07157aac CM |
333 | goto out; |
334 | } | |
ff79f819 CM |
335 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
336 | BTRFS_CRC32_SIZE); | |
d1310b2e | 337 | set_state_private(io_tree, start, csum); |
07157aac CM |
338 | out: |
339 | if (path) | |
340 | btrfs_free_path(path); | |
341 | mutex_unlock(&root->fs_info->fs_mutex); | |
342 | return ret; | |
343 | } | |
344 | ||
70dec807 CM |
345 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
346 | struct extent_state *state) | |
07157aac | 347 | { |
35ebb934 | 348 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 349 | struct inode *inode = page->mapping->host; |
d1310b2e | 350 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 351 | char *kaddr; |
aadfeb6e | 352 | u64 private = ~(u32)0; |
07157aac | 353 | int ret; |
ff79f819 CM |
354 | struct btrfs_root *root = BTRFS_I(inode)->root; |
355 | u32 csum = ~(u32)0; | |
bbf0d006 | 356 | unsigned long flags; |
d1310b2e | 357 | |
b98b6767 Y |
358 | if (btrfs_test_opt(root, NODATASUM) || |
359 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 360 | return 0; |
d1310b2e | 361 | |
70dec807 CM |
362 | if (state->start == start) { |
363 | private = state->private; | |
364 | ret = 0; | |
365 | } else { | |
366 | ret = get_state_private(io_tree, start, &private); | |
367 | } | |
bbf0d006 | 368 | local_irq_save(flags); |
07157aac CM |
369 | kaddr = kmap_atomic(page, KM_IRQ0); |
370 | if (ret) { | |
371 | goto zeroit; | |
372 | } | |
ff79f819 CM |
373 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
374 | btrfs_csum_final(csum, (char *)&csum); | |
375 | if (csum != private) { | |
07157aac CM |
376 | goto zeroit; |
377 | } | |
378 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 379 | local_irq_restore(flags); |
07157aac CM |
380 | return 0; |
381 | ||
382 | zeroit: | |
aadfeb6e CM |
383 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
384 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
385 | private); | |
db94535d CM |
386 | memset(kaddr + offset, 1, end - start + 1); |
387 | flush_dcache_page(page); | |
07157aac | 388 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 389 | local_irq_restore(flags); |
07157aac CM |
390 | return 0; |
391 | } | |
b888db2b | 392 | |
39279cc3 CM |
393 | void btrfs_read_locked_inode(struct inode *inode) |
394 | { | |
395 | struct btrfs_path *path; | |
5f39d397 | 396 | struct extent_buffer *leaf; |
39279cc3 | 397 | struct btrfs_inode_item *inode_item; |
5f39d397 | 398 | struct btrfs_inode_timespec *tspec; |
39279cc3 CM |
399 | struct btrfs_root *root = BTRFS_I(inode)->root; |
400 | struct btrfs_key location; | |
401 | u64 alloc_group_block; | |
618e21d5 | 402 | u32 rdev; |
39279cc3 CM |
403 | int ret; |
404 | ||
405 | path = btrfs_alloc_path(); | |
406 | BUG_ON(!path); | |
39279cc3 | 407 | mutex_lock(&root->fs_info->fs_mutex); |
39279cc3 | 408 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 409 | |
39279cc3 | 410 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 411 | if (ret) |
39279cc3 | 412 | goto make_bad; |
39279cc3 | 413 | |
5f39d397 CM |
414 | leaf = path->nodes[0]; |
415 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
416 | struct btrfs_inode_item); | |
417 | ||
418 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
419 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
420 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
421 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
422 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
423 | ||
424 | tspec = btrfs_inode_atime(inode_item); | |
425 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
426 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
427 | ||
428 | tspec = btrfs_inode_mtime(inode_item); | |
429 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
430 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
431 | ||
432 | tspec = btrfs_inode_ctime(inode_item); | |
433 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
434 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
435 | ||
436 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
437 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 438 | inode->i_rdev = 0; |
5f39d397 CM |
439 | rdev = btrfs_inode_rdev(leaf, inode_item); |
440 | ||
441 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
442 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
443 | alloc_group_block); | |
b98b6767 | 444 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
445 | if (!BTRFS_I(inode)->block_group) { |
446 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
447 | NULL, 0, 0, 0); | |
448 | } | |
39279cc3 CM |
449 | btrfs_free_path(path); |
450 | inode_item = NULL; | |
451 | ||
452 | mutex_unlock(&root->fs_info->fs_mutex); | |
453 | ||
454 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
455 | case S_IFREG: |
456 | inode->i_mapping->a_ops = &btrfs_aops; | |
d1310b2e | 457 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
458 | inode->i_fop = &btrfs_file_operations; |
459 | inode->i_op = &btrfs_file_inode_operations; | |
460 | break; | |
461 | case S_IFDIR: | |
462 | inode->i_fop = &btrfs_dir_file_operations; | |
463 | if (root == root->fs_info->tree_root) | |
464 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
465 | else | |
466 | inode->i_op = &btrfs_dir_inode_operations; | |
467 | break; | |
468 | case S_IFLNK: | |
469 | inode->i_op = &btrfs_symlink_inode_operations; | |
470 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
471 | break; | |
618e21d5 JB |
472 | default: |
473 | init_special_inode(inode, inode->i_mode, rdev); | |
474 | break; | |
39279cc3 CM |
475 | } |
476 | return; | |
477 | ||
478 | make_bad: | |
479 | btrfs_release_path(root, path); | |
480 | btrfs_free_path(path); | |
481 | mutex_unlock(&root->fs_info->fs_mutex); | |
482 | make_bad_inode(inode); | |
483 | } | |
484 | ||
5f39d397 CM |
485 | static void fill_inode_item(struct extent_buffer *leaf, |
486 | struct btrfs_inode_item *item, | |
39279cc3 CM |
487 | struct inode *inode) |
488 | { | |
5f39d397 CM |
489 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
490 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
491 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
492 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
493 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
494 | ||
495 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
496 | inode->i_atime.tv_sec); | |
497 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
498 | inode->i_atime.tv_nsec); | |
499 | ||
500 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
501 | inode->i_mtime.tv_sec); | |
502 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
503 | inode->i_mtime.tv_nsec); | |
504 | ||
505 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
506 | inode->i_ctime.tv_sec); | |
507 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
508 | inode->i_ctime.tv_nsec); | |
509 | ||
510 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
511 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
512 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 513 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 514 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
515 | BTRFS_I(inode)->block_group->key.objectid); |
516 | } | |
517 | ||
a52d9a80 | 518 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
519 | struct btrfs_root *root, |
520 | struct inode *inode) | |
521 | { | |
522 | struct btrfs_inode_item *inode_item; | |
523 | struct btrfs_path *path; | |
5f39d397 | 524 | struct extent_buffer *leaf; |
39279cc3 CM |
525 | int ret; |
526 | ||
527 | path = btrfs_alloc_path(); | |
528 | BUG_ON(!path); | |
39279cc3 CM |
529 | ret = btrfs_lookup_inode(trans, root, path, |
530 | &BTRFS_I(inode)->location, 1); | |
531 | if (ret) { | |
532 | if (ret > 0) | |
533 | ret = -ENOENT; | |
534 | goto failed; | |
535 | } | |
536 | ||
5f39d397 CM |
537 | leaf = path->nodes[0]; |
538 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
539 | struct btrfs_inode_item); |
540 | ||
5f39d397 CM |
541 | fill_inode_item(leaf, inode_item, inode); |
542 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 543 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
544 | ret = 0; |
545 | failed: | |
546 | btrfs_release_path(root, path); | |
547 | btrfs_free_path(path); | |
548 | return ret; | |
549 | } | |
550 | ||
551 | ||
552 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
553 | struct btrfs_root *root, | |
554 | struct inode *dir, | |
555 | struct dentry *dentry) | |
556 | { | |
557 | struct btrfs_path *path; | |
558 | const char *name = dentry->d_name.name; | |
559 | int name_len = dentry->d_name.len; | |
560 | int ret = 0; | |
5f39d397 | 561 | struct extent_buffer *leaf; |
39279cc3 | 562 | struct btrfs_dir_item *di; |
5f39d397 | 563 | struct btrfs_key key; |
39279cc3 CM |
564 | |
565 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
566 | if (!path) { |
567 | ret = -ENOMEM; | |
568 | goto err; | |
569 | } | |
570 | ||
39279cc3 CM |
571 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
572 | name, name_len, -1); | |
573 | if (IS_ERR(di)) { | |
574 | ret = PTR_ERR(di); | |
575 | goto err; | |
576 | } | |
577 | if (!di) { | |
578 | ret = -ENOENT; | |
579 | goto err; | |
580 | } | |
5f39d397 CM |
581 | leaf = path->nodes[0]; |
582 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 583 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
584 | if (ret) |
585 | goto err; | |
39279cc3 CM |
586 | btrfs_release_path(root, path); |
587 | ||
588 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 589 | key.objectid, name, name_len, -1); |
39279cc3 CM |
590 | if (IS_ERR(di)) { |
591 | ret = PTR_ERR(di); | |
592 | goto err; | |
593 | } | |
594 | if (!di) { | |
595 | ret = -ENOENT; | |
596 | goto err; | |
597 | } | |
598 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
599 | |
600 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
601 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
602 | dentry->d_inode->i_ino, | |
603 | dentry->d_parent->d_inode->i_ino); | |
604 | if (ret) { | |
605 | printk("failed to delete reference to %.*s, " | |
606 | "inode %lu parent %lu\n", name_len, name, | |
607 | dentry->d_inode->i_ino, | |
608 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 609 | } |
39279cc3 CM |
610 | err: |
611 | btrfs_free_path(path); | |
612 | if (!ret) { | |
613 | dir->i_size -= name_len * 2; | |
79c44584 | 614 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 615 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
616 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
617 | dentry->d_inode->i_nlink--; | |
618 | #else | |
39279cc3 | 619 | drop_nlink(dentry->d_inode); |
6da6abae | 620 | #endif |
54aa1f4d | 621 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
622 | dir->i_sb->s_dirt = 1; |
623 | } | |
624 | return ret; | |
625 | } | |
626 | ||
627 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
628 | { | |
629 | struct btrfs_root *root; | |
630 | struct btrfs_trans_handle *trans; | |
2da98f00 | 631 | struct inode *inode = dentry->d_inode; |
39279cc3 | 632 | int ret; |
1832a6d5 | 633 | unsigned long nr = 0; |
39279cc3 CM |
634 | |
635 | root = BTRFS_I(dir)->root; | |
636 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
637 | |
638 | ret = btrfs_check_free_space(root, 1, 1); | |
639 | if (ret) | |
640 | goto fail; | |
641 | ||
39279cc3 | 642 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 643 | |
39279cc3 CM |
644 | btrfs_set_trans_block_group(trans, dir); |
645 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 646 | nr = trans->blocks_used; |
5f39d397 | 647 | |
2da98f00 CM |
648 | if (inode->i_nlink == 0) { |
649 | int found; | |
650 | /* if the inode isn't linked anywhere, | |
651 | * we don't need to worry about | |
652 | * data=ordered | |
653 | */ | |
654 | found = btrfs_del_ordered_inode(inode); | |
655 | if (found == 1) { | |
656 | atomic_dec(&inode->i_count); | |
657 | } | |
658 | } | |
659 | ||
39279cc3 | 660 | btrfs_end_transaction(trans, root); |
1832a6d5 | 661 | fail: |
39279cc3 | 662 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 663 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 664 | btrfs_throttle(root); |
39279cc3 CM |
665 | return ret; |
666 | } | |
667 | ||
668 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
669 | { | |
670 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 671 | int err = 0; |
39279cc3 CM |
672 | int ret; |
673 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 674 | struct btrfs_trans_handle *trans; |
1832a6d5 | 675 | unsigned long nr = 0; |
39279cc3 | 676 | |
134d4512 Y |
677 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
678 | return -ENOTEMPTY; | |
679 | ||
39279cc3 | 680 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
681 | ret = btrfs_check_free_space(root, 1, 1); |
682 | if (ret) | |
683 | goto fail; | |
684 | ||
39279cc3 CM |
685 | trans = btrfs_start_transaction(root, 1); |
686 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
687 | |
688 | /* now the directory is empty */ | |
689 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
690 | if (!err) { | |
691 | inode->i_size = 0; | |
692 | } | |
3954401f | 693 | |
d3c2fdcf | 694 | nr = trans->blocks_used; |
39279cc3 | 695 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 696 | fail: |
134d4512 | 697 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 698 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 699 | btrfs_throttle(root); |
3954401f | 700 | |
39279cc3 CM |
701 | if (ret && !err) |
702 | err = ret; | |
703 | return err; | |
704 | } | |
705 | ||
39279cc3 CM |
706 | /* |
707 | * this can truncate away extent items, csum items and directory items. | |
708 | * It starts at a high offset and removes keys until it can't find | |
709 | * any higher than i_size. | |
710 | * | |
711 | * csum items that cross the new i_size are truncated to the new size | |
712 | * as well. | |
713 | */ | |
714 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
715 | struct btrfs_root *root, | |
85e21bac CM |
716 | struct inode *inode, |
717 | u32 min_type) | |
39279cc3 CM |
718 | { |
719 | int ret; | |
720 | struct btrfs_path *path; | |
721 | struct btrfs_key key; | |
5f39d397 | 722 | struct btrfs_key found_key; |
39279cc3 | 723 | u32 found_type; |
5f39d397 | 724 | struct extent_buffer *leaf; |
39279cc3 CM |
725 | struct btrfs_file_extent_item *fi; |
726 | u64 extent_start = 0; | |
db94535d | 727 | u64 extent_num_bytes = 0; |
39279cc3 | 728 | u64 item_end = 0; |
7bb86316 | 729 | u64 root_gen = 0; |
d8d5f3e1 | 730 | u64 root_owner = 0; |
39279cc3 CM |
731 | int found_extent; |
732 | int del_item; | |
85e21bac CM |
733 | int pending_del_nr = 0; |
734 | int pending_del_slot = 0; | |
179e29e4 | 735 | int extent_type = -1; |
39279cc3 | 736 | |
a52d9a80 | 737 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 738 | path = btrfs_alloc_path(); |
3c69faec | 739 | path->reada = -1; |
39279cc3 | 740 | BUG_ON(!path); |
5f39d397 | 741 | |
39279cc3 CM |
742 | /* FIXME, add redo link to tree so we don't leak on crash */ |
743 | key.objectid = inode->i_ino; | |
744 | key.offset = (u64)-1; | |
5f39d397 CM |
745 | key.type = (u8)-1; |
746 | ||
85e21bac CM |
747 | btrfs_init_path(path); |
748 | search_again: | |
749 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
750 | if (ret < 0) { | |
751 | goto error; | |
752 | } | |
753 | if (ret > 0) { | |
754 | BUG_ON(path->slots[0] == 0); | |
755 | path->slots[0]--; | |
756 | } | |
757 | ||
39279cc3 | 758 | while(1) { |
39279cc3 | 759 | fi = NULL; |
5f39d397 CM |
760 | leaf = path->nodes[0]; |
761 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
762 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 763 | |
5f39d397 | 764 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 765 | break; |
5f39d397 | 766 | |
85e21bac | 767 | if (found_type < min_type) |
39279cc3 CM |
768 | break; |
769 | ||
5f39d397 | 770 | item_end = found_key.offset; |
39279cc3 | 771 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 772 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 773 | struct btrfs_file_extent_item); |
179e29e4 CM |
774 | extent_type = btrfs_file_extent_type(leaf, fi); |
775 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 776 | item_end += |
db94535d | 777 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
778 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
779 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
780 | path->slots[0]); | |
781 | item_end += btrfs_file_extent_inline_len(leaf, | |
782 | item); | |
39279cc3 | 783 | } |
008630c1 | 784 | item_end--; |
39279cc3 CM |
785 | } |
786 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
787 | ret = btrfs_csum_truncate(trans, root, path, | |
788 | inode->i_size); | |
789 | BUG_ON(ret); | |
790 | } | |
008630c1 | 791 | if (item_end < inode->i_size) { |
b888db2b CM |
792 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
793 | found_type = BTRFS_INODE_ITEM_KEY; | |
794 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
795 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
796 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
797 | found_type = BTRFS_XATTR_ITEM_KEY; | |
798 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
799 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
800 | } else if (found_type) { |
801 | found_type--; | |
802 | } else { | |
803 | break; | |
39279cc3 | 804 | } |
a61721d5 | 805 | btrfs_set_key_type(&key, found_type); |
85e21bac | 806 | goto next; |
39279cc3 | 807 | } |
5f39d397 | 808 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
809 | del_item = 1; |
810 | else | |
811 | del_item = 0; | |
812 | found_extent = 0; | |
813 | ||
814 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
815 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
816 | goto delete; | |
817 | ||
818 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 819 | u64 num_dec; |
db94535d | 820 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 821 | if (!del_item) { |
db94535d CM |
822 | u64 orig_num_bytes = |
823 | btrfs_file_extent_num_bytes(leaf, fi); | |
824 | extent_num_bytes = inode->i_size - | |
5f39d397 | 825 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
826 | extent_num_bytes = extent_num_bytes & |
827 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
828 | btrfs_set_file_extent_num_bytes(leaf, fi, |
829 | extent_num_bytes); | |
830 | num_dec = (orig_num_bytes - | |
831 | extent_num_bytes) >> 9; | |
bab9fb03 Y |
832 | if (extent_start != 0) { |
833 | inode->i_blocks -= num_dec; | |
834 | } | |
5f39d397 | 835 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 836 | } else { |
db94535d CM |
837 | extent_num_bytes = |
838 | btrfs_file_extent_disk_num_bytes(leaf, | |
839 | fi); | |
39279cc3 | 840 | /* FIXME blocksize != 4096 */ |
db94535d CM |
841 | num_dec = btrfs_file_extent_num_bytes(leaf, |
842 | fi) >> 9; | |
39279cc3 CM |
843 | if (extent_start != 0) { |
844 | found_extent = 1; | |
845 | inode->i_blocks -= num_dec; | |
846 | } | |
d8d5f3e1 CM |
847 | root_gen = btrfs_header_generation(leaf); |
848 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 849 | } |
179e29e4 CM |
850 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE && |
851 | !del_item) { | |
852 | u32 newsize = inode->i_size - found_key.offset; | |
853 | newsize = btrfs_file_extent_calc_inline_size(newsize); | |
854 | ret = btrfs_truncate_item(trans, root, path, | |
855 | newsize, 1); | |
856 | BUG_ON(ret); | |
39279cc3 | 857 | } |
179e29e4 | 858 | delete: |
39279cc3 | 859 | if (del_item) { |
85e21bac CM |
860 | if (!pending_del_nr) { |
861 | /* no pending yet, add ourselves */ | |
862 | pending_del_slot = path->slots[0]; | |
863 | pending_del_nr = 1; | |
864 | } else if (pending_del_nr && | |
865 | path->slots[0] + 1 == pending_del_slot) { | |
866 | /* hop on the pending chunk */ | |
867 | pending_del_nr++; | |
868 | pending_del_slot = path->slots[0]; | |
869 | } else { | |
870 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
871 | } | |
39279cc3 CM |
872 | } else { |
873 | break; | |
874 | } | |
39279cc3 CM |
875 | if (found_extent) { |
876 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 877 | extent_num_bytes, |
d8d5f3e1 | 878 | root_owner, |
7bb86316 CM |
879 | root_gen, inode->i_ino, |
880 | found_key.offset, 0); | |
39279cc3 CM |
881 | BUG_ON(ret); |
882 | } | |
85e21bac CM |
883 | next: |
884 | if (path->slots[0] == 0) { | |
885 | if (pending_del_nr) | |
886 | goto del_pending; | |
887 | btrfs_release_path(root, path); | |
888 | goto search_again; | |
889 | } | |
890 | ||
891 | path->slots[0]--; | |
892 | if (pending_del_nr && | |
893 | path->slots[0] + 1 != pending_del_slot) { | |
894 | struct btrfs_key debug; | |
895 | del_pending: | |
896 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
897 | pending_del_slot); | |
898 | ret = btrfs_del_items(trans, root, path, | |
899 | pending_del_slot, | |
900 | pending_del_nr); | |
901 | BUG_ON(ret); | |
902 | pending_del_nr = 0; | |
903 | btrfs_release_path(root, path); | |
904 | goto search_again; | |
905 | } | |
39279cc3 CM |
906 | } |
907 | ret = 0; | |
908 | error: | |
85e21bac CM |
909 | if (pending_del_nr) { |
910 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
911 | pending_del_nr); | |
912 | } | |
39279cc3 CM |
913 | btrfs_release_path(root, path); |
914 | btrfs_free_path(path); | |
915 | inode->i_sb->s_dirt = 1; | |
916 | return ret; | |
917 | } | |
918 | ||
b888db2b | 919 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
920 | size_t zero_start) |
921 | { | |
922 | char *kaddr; | |
d1310b2e | 923 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
35ebb934 | 924 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 925 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 | 926 | int ret = 0; |
a52d9a80 | 927 | |
190662b2 | 928 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 929 | set_page_extent_mapped(page); |
a52d9a80 | 930 | |
d1310b2e | 931 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 932 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, |
b888db2b | 933 | page_end, GFP_NOFS); |
1832a6d5 | 934 | |
a52d9a80 | 935 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 936 | kaddr = kmap(page); |
a52d9a80 CM |
937 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
938 | flush_dcache_page(page); | |
b888db2b | 939 | kunmap(page); |
a52d9a80 | 940 | } |
b888db2b | 941 | set_page_dirty(page); |
d1310b2e | 942 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
a52d9a80 | 943 | |
a52d9a80 CM |
944 | return ret; |
945 | } | |
946 | ||
39279cc3 CM |
947 | /* |
948 | * taken from block_truncate_page, but does cow as it zeros out | |
949 | * any bytes left in the last page in the file. | |
950 | */ | |
951 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
952 | { | |
953 | struct inode *inode = mapping->host; | |
db94535d CM |
954 | struct btrfs_root *root = BTRFS_I(inode)->root; |
955 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
956 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
957 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
958 | struct page *page; | |
39279cc3 | 959 | int ret = 0; |
a52d9a80 | 960 | u64 page_start; |
39279cc3 CM |
961 | |
962 | if ((offset & (blocksize - 1)) == 0) | |
963 | goto out; | |
964 | ||
965 | ret = -ENOMEM; | |
966 | page = grab_cache_page(mapping, index); | |
967 | if (!page) | |
968 | goto out; | |
39279cc3 | 969 | if (!PageUptodate(page)) { |
9ebefb18 | 970 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
971 | lock_page(page); |
972 | if (!PageUptodate(page)) { | |
973 | ret = -EIO; | |
974 | goto out; | |
975 | } | |
976 | } | |
35ebb934 | 977 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 978 | |
b888db2b | 979 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 980 | |
39279cc3 CM |
981 | unlock_page(page); |
982 | page_cache_release(page); | |
983 | out: | |
984 | return ret; | |
985 | } | |
986 | ||
987 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
988 | { | |
989 | struct inode *inode = dentry->d_inode; | |
990 | int err; | |
991 | ||
992 | err = inode_change_ok(inode, attr); | |
993 | if (err) | |
994 | return err; | |
995 | ||
996 | if (S_ISREG(inode->i_mode) && | |
997 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
998 | struct btrfs_trans_handle *trans; | |
999 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1000 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1001 | |
5f39d397 | 1002 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1003 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1004 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1005 | u64 hole_size; |
179e29e4 | 1006 | u64 alloc_hint = 0; |
39279cc3 | 1007 | |
1b0f7c29 | 1008 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1009 | goto out; |
1010 | ||
1832a6d5 CM |
1011 | mutex_lock(&root->fs_info->fs_mutex); |
1012 | err = btrfs_check_free_space(root, 1, 0); | |
1013 | mutex_unlock(&root->fs_info->fs_mutex); | |
1014 | if (err) | |
1015 | goto fail; | |
1016 | ||
39279cc3 CM |
1017 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1018 | ||
1b0f7c29 | 1019 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
5f56406a | 1020 | hole_size = block_end - hole_start; |
39279cc3 CM |
1021 | |
1022 | mutex_lock(&root->fs_info->fs_mutex); | |
1023 | trans = btrfs_start_transaction(root, 1); | |
1024 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 1025 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1026 | hole_start, block_end, hole_start, |
3326d1b0 | 1027 | &alloc_hint); |
2bf5a725 | 1028 | |
179e29e4 CM |
1029 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1030 | err = btrfs_insert_file_extent(trans, root, | |
1031 | inode->i_ino, | |
5f56406a CM |
1032 | hole_start, 0, 0, |
1033 | hole_size); | |
d1310b2e CM |
1034 | btrfs_drop_extent_cache(inode, hole_start, |
1035 | hole_size - 1); | |
5f56406a | 1036 | btrfs_check_file(root, inode); |
179e29e4 | 1037 | } |
39279cc3 CM |
1038 | btrfs_end_transaction(trans, root); |
1039 | mutex_unlock(&root->fs_info->fs_mutex); | |
1b0f7c29 | 1040 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1041 | if (err) |
1042 | return err; | |
39279cc3 CM |
1043 | } |
1044 | out: | |
1045 | err = inode_setattr(inode, attr); | |
1832a6d5 | 1046 | fail: |
39279cc3 CM |
1047 | return err; |
1048 | } | |
61295eb8 | 1049 | |
2da98f00 | 1050 | void btrfs_put_inode(struct inode *inode) |
61295eb8 | 1051 | { |
2da98f00 CM |
1052 | int ret; |
1053 | ||
1054 | if (!BTRFS_I(inode)->ordered_trans) { | |
61295eb8 CM |
1055 | return; |
1056 | } | |
2da98f00 CM |
1057 | |
1058 | if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) || | |
1059 | mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) | |
1060 | return; | |
1061 | ||
1062 | ret = btrfs_del_ordered_inode(inode); | |
1063 | if (ret == 1) { | |
1064 | atomic_dec(&inode->i_count); | |
1065 | } | |
61295eb8 CM |
1066 | } |
1067 | ||
39279cc3 CM |
1068 | void btrfs_delete_inode(struct inode *inode) |
1069 | { | |
1070 | struct btrfs_trans_handle *trans; | |
1071 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1072 | unsigned long nr; |
39279cc3 CM |
1073 | int ret; |
1074 | ||
1075 | truncate_inode_pages(&inode->i_data, 0); | |
1076 | if (is_bad_inode(inode)) { | |
1077 | goto no_delete; | |
1078 | } | |
5f39d397 | 1079 | |
39279cc3 CM |
1080 | inode->i_size = 0; |
1081 | mutex_lock(&root->fs_info->fs_mutex); | |
1082 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1083 | |
39279cc3 | 1084 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1085 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
54aa1f4d CM |
1086 | if (ret) |
1087 | goto no_delete_lock; | |
85e21bac | 1088 | |
d3c2fdcf | 1089 | nr = trans->blocks_used; |
85e21bac | 1090 | clear_inode(inode); |
5f39d397 | 1091 | |
39279cc3 CM |
1092 | btrfs_end_transaction(trans, root); |
1093 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1094 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1095 | btrfs_throttle(root); |
39279cc3 | 1096 | return; |
54aa1f4d CM |
1097 | |
1098 | no_delete_lock: | |
d3c2fdcf | 1099 | nr = trans->blocks_used; |
54aa1f4d CM |
1100 | btrfs_end_transaction(trans, root); |
1101 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1102 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1103 | btrfs_throttle(root); |
39279cc3 CM |
1104 | no_delete: |
1105 | clear_inode(inode); | |
1106 | } | |
1107 | ||
1108 | /* | |
1109 | * this returns the key found in the dir entry in the location pointer. | |
1110 | * If no dir entries were found, location->objectid is 0. | |
1111 | */ | |
1112 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1113 | struct btrfs_key *location) | |
1114 | { | |
1115 | const char *name = dentry->d_name.name; | |
1116 | int namelen = dentry->d_name.len; | |
1117 | struct btrfs_dir_item *di; | |
1118 | struct btrfs_path *path; | |
1119 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1120 | int ret = 0; |
39279cc3 | 1121 | |
3954401f CM |
1122 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1123 | location->objectid = dir->i_ino; | |
1124 | location->type = BTRFS_INODE_ITEM_KEY; | |
1125 | location->offset = 0; | |
1126 | return 0; | |
1127 | } | |
39279cc3 CM |
1128 | path = btrfs_alloc_path(); |
1129 | BUG_ON(!path); | |
3954401f | 1130 | |
7a720536 | 1131 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1132 | struct btrfs_key key; |
1133 | struct extent_buffer *leaf; | |
1134 | u32 nritems; | |
1135 | int slot; | |
1136 | ||
1137 | key.objectid = dir->i_ino; | |
1138 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1139 | key.offset = 0; | |
1140 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1141 | BUG_ON(ret == 0); | |
1142 | ret = 0; | |
1143 | ||
1144 | leaf = path->nodes[0]; | |
1145 | slot = path->slots[0]; | |
1146 | nritems = btrfs_header_nritems(leaf); | |
1147 | if (slot >= nritems) | |
1148 | goto out_err; | |
1149 | ||
1150 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1151 | if (key.objectid != dir->i_ino || | |
1152 | key.type != BTRFS_INODE_REF_KEY) { | |
1153 | goto out_err; | |
1154 | } | |
1155 | location->objectid = key.offset; | |
1156 | location->type = BTRFS_INODE_ITEM_KEY; | |
1157 | location->offset = 0; | |
1158 | goto out; | |
1159 | } | |
1160 | ||
39279cc3 CM |
1161 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1162 | namelen, 0); | |
0d9f7f3e Y |
1163 | if (IS_ERR(di)) |
1164 | ret = PTR_ERR(di); | |
39279cc3 | 1165 | if (!di || IS_ERR(di)) { |
3954401f | 1166 | goto out_err; |
39279cc3 | 1167 | } |
5f39d397 | 1168 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1169 | out: |
39279cc3 CM |
1170 | btrfs_free_path(path); |
1171 | return ret; | |
3954401f CM |
1172 | out_err: |
1173 | location->objectid = 0; | |
1174 | goto out; | |
39279cc3 CM |
1175 | } |
1176 | ||
1177 | /* | |
1178 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1179 | * needs to be changed to reflect the root directory of the tree root. This | |
1180 | * is kind of like crossing a mount point. | |
1181 | */ | |
1182 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1183 | struct btrfs_key *location, | |
58176a96 JB |
1184 | struct btrfs_root **sub_root, |
1185 | struct dentry *dentry) | |
39279cc3 CM |
1186 | { |
1187 | struct btrfs_path *path; | |
1188 | struct btrfs_root_item *ri; | |
1189 | ||
1190 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1191 | return 0; | |
1192 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1193 | return 0; | |
1194 | ||
1195 | path = btrfs_alloc_path(); | |
1196 | BUG_ON(!path); | |
1197 | mutex_lock(&root->fs_info->fs_mutex); | |
1198 | ||
58176a96 JB |
1199 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1200 | dentry->d_name.name, | |
1201 | dentry->d_name.len); | |
39279cc3 CM |
1202 | if (IS_ERR(*sub_root)) |
1203 | return PTR_ERR(*sub_root); | |
1204 | ||
1205 | ri = &(*sub_root)->root_item; | |
1206 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1207 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1208 | location->offset = 0; | |
1209 | ||
1210 | btrfs_free_path(path); | |
1211 | mutex_unlock(&root->fs_info->fs_mutex); | |
1212 | return 0; | |
1213 | } | |
1214 | ||
1215 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1216 | { | |
1217 | struct btrfs_iget_args *args = p; | |
1218 | inode->i_ino = args->ino; | |
1219 | BTRFS_I(inode)->root = args->root; | |
d1310b2e CM |
1220 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1221 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1222 | inode->i_mapping, GFP_NOFS); |
39279cc3 CM |
1223 | return 0; |
1224 | } | |
1225 | ||
1226 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1227 | { | |
1228 | struct btrfs_iget_args *args = opaque; | |
1229 | return (args->ino == inode->i_ino && | |
1230 | args->root == BTRFS_I(inode)->root); | |
1231 | } | |
1232 | ||
dc17ff8f CM |
1233 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1234 | u64 root_objectid) | |
1235 | { | |
1236 | struct btrfs_iget_args args; | |
1237 | args.ino = objectid; | |
1238 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1239 | ||
1240 | if (!args.root) | |
1241 | return NULL; | |
1242 | ||
1243 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1244 | } | |
1245 | ||
39279cc3 CM |
1246 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1247 | struct btrfs_root *root) | |
1248 | { | |
1249 | struct inode *inode; | |
1250 | struct btrfs_iget_args args; | |
1251 | args.ino = objectid; | |
1252 | args.root = root; | |
1253 | ||
1254 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1255 | btrfs_init_locked_inode, | |
1256 | (void *)&args); | |
1257 | return inode; | |
1258 | } | |
1259 | ||
1260 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1261 | struct nameidata *nd) | |
1262 | { | |
1263 | struct inode * inode; | |
1264 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1265 | struct btrfs_root *root = bi->root; | |
1266 | struct btrfs_root *sub_root = root; | |
1267 | struct btrfs_key location; | |
1268 | int ret; | |
1269 | ||
1270 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1271 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1272 | |
39279cc3 CM |
1273 | mutex_lock(&root->fs_info->fs_mutex); |
1274 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1275 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1276 | |
39279cc3 CM |
1277 | if (ret < 0) |
1278 | return ERR_PTR(ret); | |
5f39d397 | 1279 | |
39279cc3 CM |
1280 | inode = NULL; |
1281 | if (location.objectid) { | |
58176a96 JB |
1282 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1283 | dentry); | |
39279cc3 CM |
1284 | if (ret < 0) |
1285 | return ERR_PTR(ret); | |
1286 | if (ret > 0) | |
1287 | return ERR_PTR(-ENOENT); | |
1288 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1289 | sub_root); | |
1290 | if (!inode) | |
1291 | return ERR_PTR(-EACCES); | |
1292 | if (inode->i_state & I_NEW) { | |
1293 | /* the inode and parent dir are two different roots */ | |
1294 | if (sub_root != root) { | |
1295 | igrab(inode); | |
1296 | sub_root->inode = inode; | |
1297 | } | |
1298 | BTRFS_I(inode)->root = sub_root; | |
1299 | memcpy(&BTRFS_I(inode)->location, &location, | |
1300 | sizeof(location)); | |
1301 | btrfs_read_locked_inode(inode); | |
1302 | unlock_new_inode(inode); | |
1303 | } | |
1304 | } | |
1305 | return d_splice_alias(inode, dentry); | |
1306 | } | |
1307 | ||
39279cc3 CM |
1308 | static unsigned char btrfs_filetype_table[] = { |
1309 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1310 | }; | |
1311 | ||
1312 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1313 | { | |
6da6abae | 1314 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1315 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1316 | struct btrfs_item *item; | |
1317 | struct btrfs_dir_item *di; | |
1318 | struct btrfs_key key; | |
5f39d397 | 1319 | struct btrfs_key found_key; |
39279cc3 CM |
1320 | struct btrfs_path *path; |
1321 | int ret; | |
1322 | u32 nritems; | |
5f39d397 | 1323 | struct extent_buffer *leaf; |
39279cc3 CM |
1324 | int slot; |
1325 | int advance; | |
1326 | unsigned char d_type; | |
1327 | int over = 0; | |
1328 | u32 di_cur; | |
1329 | u32 di_total; | |
1330 | u32 di_len; | |
1331 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1332 | char tmp_name[32]; |
1333 | char *name_ptr; | |
1334 | int name_len; | |
39279cc3 CM |
1335 | |
1336 | /* FIXME, use a real flag for deciding about the key type */ | |
1337 | if (root->fs_info->tree_root == root) | |
1338 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1339 | |
3954401f CM |
1340 | /* special case for "." */ |
1341 | if (filp->f_pos == 0) { | |
1342 | over = filldir(dirent, ".", 1, | |
1343 | 1, inode->i_ino, | |
1344 | DT_DIR); | |
1345 | if (over) | |
1346 | return 0; | |
1347 | filp->f_pos = 1; | |
1348 | } | |
1349 | ||
39279cc3 CM |
1350 | mutex_lock(&root->fs_info->fs_mutex); |
1351 | key.objectid = inode->i_ino; | |
3954401f CM |
1352 | path = btrfs_alloc_path(); |
1353 | path->reada = 2; | |
1354 | ||
1355 | /* special case for .., just use the back ref */ | |
1356 | if (filp->f_pos == 1) { | |
1357 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1358 | key.offset = 0; | |
1359 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1360 | BUG_ON(ret == 0); | |
1361 | leaf = path->nodes[0]; | |
1362 | slot = path->slots[0]; | |
1363 | nritems = btrfs_header_nritems(leaf); | |
1364 | if (slot >= nritems) { | |
1365 | btrfs_release_path(root, path); | |
1366 | goto read_dir_items; | |
1367 | } | |
1368 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1369 | btrfs_release_path(root, path); | |
1370 | if (found_key.objectid != key.objectid || | |
1371 | found_key.type != BTRFS_INODE_REF_KEY) | |
1372 | goto read_dir_items; | |
1373 | over = filldir(dirent, "..", 2, | |
1374 | 2, found_key.offset, DT_DIR); | |
1375 | if (over) | |
1376 | goto nopos; | |
1377 | filp->f_pos = 2; | |
1378 | } | |
1379 | ||
1380 | read_dir_items: | |
39279cc3 CM |
1381 | btrfs_set_key_type(&key, key_type); |
1382 | key.offset = filp->f_pos; | |
5f39d397 | 1383 | |
39279cc3 CM |
1384 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1385 | if (ret < 0) | |
1386 | goto err; | |
1387 | advance = 0; | |
39279cc3 | 1388 | while(1) { |
5f39d397 CM |
1389 | leaf = path->nodes[0]; |
1390 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1391 | slot = path->slots[0]; |
1392 | if (advance || slot >= nritems) { | |
1393 | if (slot >= nritems -1) { | |
39279cc3 CM |
1394 | ret = btrfs_next_leaf(root, path); |
1395 | if (ret) | |
1396 | break; | |
5f39d397 CM |
1397 | leaf = path->nodes[0]; |
1398 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1399 | slot = path->slots[0]; |
1400 | } else { | |
1401 | slot++; | |
1402 | path->slots[0]++; | |
1403 | } | |
1404 | } | |
1405 | advance = 1; | |
5f39d397 CM |
1406 | item = btrfs_item_nr(leaf, slot); |
1407 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1408 | ||
1409 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1410 | break; |
5f39d397 | 1411 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1412 | break; |
5f39d397 | 1413 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1414 | continue; |
5f39d397 CM |
1415 | |
1416 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1417 | advance = 1; |
1418 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1419 | di_cur = 0; | |
5f39d397 | 1420 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1421 | while(di_cur < di_total) { |
5f39d397 CM |
1422 | struct btrfs_key location; |
1423 | ||
1424 | name_len = btrfs_dir_name_len(leaf, di); | |
1425 | if (name_len < 32) { | |
1426 | name_ptr = tmp_name; | |
1427 | } else { | |
1428 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1429 | BUG_ON(!name_ptr); | |
1430 | } | |
1431 | read_extent_buffer(leaf, name_ptr, | |
1432 | (unsigned long)(di + 1), name_len); | |
1433 | ||
1434 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1435 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1436 | over = filldir(dirent, name_ptr, name_len, |
1437 | found_key.offset, | |
1438 | location.objectid, | |
39279cc3 | 1439 | d_type); |
5f39d397 CM |
1440 | |
1441 | if (name_ptr != tmp_name) | |
1442 | kfree(name_ptr); | |
1443 | ||
39279cc3 CM |
1444 | if (over) |
1445 | goto nopos; | |
5103e947 JB |
1446 | di_len = btrfs_dir_name_len(leaf, di) + |
1447 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1448 | di_cur += di_len; |
1449 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1450 | } | |
1451 | } | |
c2a8b6e1 | 1452 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); |
39279cc3 CM |
1453 | nopos: |
1454 | ret = 0; | |
1455 | err: | |
1456 | btrfs_release_path(root, path); | |
1457 | btrfs_free_path(path); | |
1458 | mutex_unlock(&root->fs_info->fs_mutex); | |
1459 | return ret; | |
1460 | } | |
1461 | ||
1462 | int btrfs_write_inode(struct inode *inode, int wait) | |
1463 | { | |
1464 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1465 | struct btrfs_trans_handle *trans; | |
1466 | int ret = 0; | |
1467 | ||
1468 | if (wait) { | |
1469 | mutex_lock(&root->fs_info->fs_mutex); | |
1470 | trans = btrfs_start_transaction(root, 1); | |
1471 | btrfs_set_trans_block_group(trans, inode); | |
1472 | ret = btrfs_commit_transaction(trans, root); | |
1473 | mutex_unlock(&root->fs_info->fs_mutex); | |
1474 | } | |
1475 | return ret; | |
1476 | } | |
1477 | ||
1478 | /* | |
54aa1f4d | 1479 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1480 | * inode changes. But, it is most likely to find the inode in cache. |
1481 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1482 | * to keep or drop this code. | |
1483 | */ | |
1484 | void btrfs_dirty_inode(struct inode *inode) | |
1485 | { | |
1486 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1487 | struct btrfs_trans_handle *trans; | |
1488 | ||
1489 | mutex_lock(&root->fs_info->fs_mutex); | |
1490 | trans = btrfs_start_transaction(root, 1); | |
1491 | btrfs_set_trans_block_group(trans, inode); | |
1492 | btrfs_update_inode(trans, root, inode); | |
1493 | btrfs_end_transaction(trans, root); | |
1494 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1495 | } |
1496 | ||
1497 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1498 | struct btrfs_root *root, | |
9c58309d CM |
1499 | const char *name, int name_len, |
1500 | u64 ref_objectid, | |
39279cc3 CM |
1501 | u64 objectid, |
1502 | struct btrfs_block_group_cache *group, | |
1503 | int mode) | |
1504 | { | |
1505 | struct inode *inode; | |
5f39d397 | 1506 | struct btrfs_inode_item *inode_item; |
39279cc3 | 1507 | struct btrfs_key *location; |
5f39d397 | 1508 | struct btrfs_path *path; |
9c58309d CM |
1509 | struct btrfs_inode_ref *ref; |
1510 | struct btrfs_key key[2]; | |
1511 | u32 sizes[2]; | |
1512 | unsigned long ptr; | |
39279cc3 CM |
1513 | int ret; |
1514 | int owner; | |
1515 | ||
5f39d397 CM |
1516 | path = btrfs_alloc_path(); |
1517 | BUG_ON(!path); | |
1518 | ||
39279cc3 CM |
1519 | inode = new_inode(root->fs_info->sb); |
1520 | if (!inode) | |
1521 | return ERR_PTR(-ENOMEM); | |
1522 | ||
d1310b2e CM |
1523 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1524 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1525 | inode->i_mapping, GFP_NOFS); |
39279cc3 | 1526 | BTRFS_I(inode)->root = root; |
b888db2b | 1527 | |
39279cc3 CM |
1528 | if (mode & S_IFDIR) |
1529 | owner = 0; | |
1530 | else | |
1531 | owner = 1; | |
1532 | group = btrfs_find_block_group(root, group, 0, 0, owner); | |
1533 | BTRFS_I(inode)->block_group = group; | |
b98b6767 | 1534 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
1535 | |
1536 | key[0].objectid = objectid; | |
1537 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
1538 | key[0].offset = 0; | |
1539 | ||
1540 | key[1].objectid = objectid; | |
1541 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
1542 | key[1].offset = ref_objectid; | |
1543 | ||
1544 | sizes[0] = sizeof(struct btrfs_inode_item); | |
1545 | sizes[1] = name_len + sizeof(*ref); | |
1546 | ||
1547 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
1548 | if (ret != 0) | |
5f39d397 CM |
1549 | goto fail; |
1550 | ||
9c58309d CM |
1551 | if (objectid > root->highest_inode) |
1552 | root->highest_inode = objectid; | |
1553 | ||
39279cc3 CM |
1554 | inode->i_uid = current->fsuid; |
1555 | inode->i_gid = current->fsgid; | |
1556 | inode->i_mode = mode; | |
1557 | inode->i_ino = objectid; | |
1558 | inode->i_blocks = 0; | |
1559 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1560 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1561 | struct btrfs_inode_item); | |
1562 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
1563 | |
1564 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
1565 | struct btrfs_inode_ref); | |
1566 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
1567 | ptr = (unsigned long)(ref + 1); | |
1568 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
1569 | ||
5f39d397 CM |
1570 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1571 | btrfs_free_path(path); | |
1572 | ||
39279cc3 CM |
1573 | location = &BTRFS_I(inode)->location; |
1574 | location->objectid = objectid; | |
39279cc3 CM |
1575 | location->offset = 0; |
1576 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1577 | ||
39279cc3 CM |
1578 | insert_inode_hash(inode); |
1579 | return inode; | |
5f39d397 CM |
1580 | fail: |
1581 | btrfs_free_path(path); | |
1582 | return ERR_PTR(ret); | |
39279cc3 CM |
1583 | } |
1584 | ||
1585 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1586 | { | |
1587 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1588 | } | |
1589 | ||
1590 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1591 | struct dentry *dentry, struct inode *inode, |
1592 | int add_backref) | |
39279cc3 CM |
1593 | { |
1594 | int ret; | |
1595 | struct btrfs_key key; | |
1596 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1597 | struct inode *parent_inode; |
5f39d397 | 1598 | |
39279cc3 | 1599 | key.objectid = inode->i_ino; |
39279cc3 CM |
1600 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1601 | key.offset = 0; | |
1602 | ||
1603 | ret = btrfs_insert_dir_item(trans, root, | |
1604 | dentry->d_name.name, dentry->d_name.len, | |
1605 | dentry->d_parent->d_inode->i_ino, | |
1606 | &key, btrfs_inode_type(inode)); | |
1607 | if (ret == 0) { | |
9c58309d CM |
1608 | if (add_backref) { |
1609 | ret = btrfs_insert_inode_ref(trans, root, | |
1610 | dentry->d_name.name, | |
1611 | dentry->d_name.len, | |
1612 | inode->i_ino, | |
1613 | dentry->d_parent->d_inode->i_ino); | |
1614 | } | |
79c44584 CM |
1615 | parent_inode = dentry->d_parent->d_inode; |
1616 | parent_inode->i_size += dentry->d_name.len * 2; | |
1617 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1618 | ret = btrfs_update_inode(trans, root, |
1619 | dentry->d_parent->d_inode); | |
1620 | } | |
1621 | return ret; | |
1622 | } | |
1623 | ||
1624 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1625 | struct dentry *dentry, struct inode *inode, |
1626 | int backref) | |
39279cc3 | 1627 | { |
9c58309d | 1628 | int err = btrfs_add_link(trans, dentry, inode, backref); |
39279cc3 CM |
1629 | if (!err) { |
1630 | d_instantiate(dentry, inode); | |
1631 | return 0; | |
1632 | } | |
1633 | if (err > 0) | |
1634 | err = -EEXIST; | |
1635 | return err; | |
1636 | } | |
1637 | ||
618e21d5 JB |
1638 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1639 | int mode, dev_t rdev) | |
1640 | { | |
1641 | struct btrfs_trans_handle *trans; | |
1642 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1643 | struct inode *inode = NULL; |
618e21d5 JB |
1644 | int err; |
1645 | int drop_inode = 0; | |
1646 | u64 objectid; | |
1832a6d5 | 1647 | unsigned long nr = 0; |
618e21d5 JB |
1648 | |
1649 | if (!new_valid_dev(rdev)) | |
1650 | return -EINVAL; | |
1651 | ||
1652 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1653 | err = btrfs_check_free_space(root, 1, 0); |
1654 | if (err) | |
1655 | goto fail; | |
1656 | ||
618e21d5 JB |
1657 | trans = btrfs_start_transaction(root, 1); |
1658 | btrfs_set_trans_block_group(trans, dir); | |
1659 | ||
1660 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1661 | if (err) { | |
1662 | err = -ENOSPC; | |
1663 | goto out_unlock; | |
1664 | } | |
1665 | ||
9c58309d CM |
1666 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1667 | dentry->d_name.len, | |
1668 | dentry->d_parent->d_inode->i_ino, objectid, | |
618e21d5 JB |
1669 | BTRFS_I(dir)->block_group, mode); |
1670 | err = PTR_ERR(inode); | |
1671 | if (IS_ERR(inode)) | |
1672 | goto out_unlock; | |
1673 | ||
1674 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1675 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
618e21d5 JB |
1676 | if (err) |
1677 | drop_inode = 1; | |
1678 | else { | |
1679 | inode->i_op = &btrfs_special_inode_operations; | |
1680 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1681 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1682 | } |
1683 | dir->i_sb->s_dirt = 1; | |
1684 | btrfs_update_inode_block_group(trans, inode); | |
1685 | btrfs_update_inode_block_group(trans, dir); | |
1686 | out_unlock: | |
d3c2fdcf | 1687 | nr = trans->blocks_used; |
618e21d5 | 1688 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1689 | fail: |
618e21d5 JB |
1690 | mutex_unlock(&root->fs_info->fs_mutex); |
1691 | ||
1692 | if (drop_inode) { | |
1693 | inode_dec_link_count(inode); | |
1694 | iput(inode); | |
1695 | } | |
d3c2fdcf | 1696 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1697 | btrfs_throttle(root); |
618e21d5 JB |
1698 | return err; |
1699 | } | |
1700 | ||
39279cc3 CM |
1701 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1702 | int mode, struct nameidata *nd) | |
1703 | { | |
1704 | struct btrfs_trans_handle *trans; | |
1705 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1706 | struct inode *inode = NULL; |
39279cc3 CM |
1707 | int err; |
1708 | int drop_inode = 0; | |
1832a6d5 | 1709 | unsigned long nr = 0; |
39279cc3 CM |
1710 | u64 objectid; |
1711 | ||
1712 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1713 | err = btrfs_check_free_space(root, 1, 0); |
1714 | if (err) | |
1715 | goto fail; | |
39279cc3 CM |
1716 | trans = btrfs_start_transaction(root, 1); |
1717 | btrfs_set_trans_block_group(trans, dir); | |
1718 | ||
1719 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1720 | if (err) { | |
1721 | err = -ENOSPC; | |
1722 | goto out_unlock; | |
1723 | } | |
1724 | ||
9c58309d CM |
1725 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1726 | dentry->d_name.len, | |
1727 | dentry->d_parent->d_inode->i_ino, | |
1728 | objectid, BTRFS_I(dir)->block_group, mode); | |
39279cc3 CM |
1729 | err = PTR_ERR(inode); |
1730 | if (IS_ERR(inode)) | |
1731 | goto out_unlock; | |
1732 | ||
1733 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1734 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
1735 | if (err) |
1736 | drop_inode = 1; | |
1737 | else { | |
1738 | inode->i_mapping->a_ops = &btrfs_aops; | |
1739 | inode->i_fop = &btrfs_file_operations; | |
1740 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
1741 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1742 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 1743 | inode->i_mapping, GFP_NOFS); |
d1310b2e | 1744 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1745 | } |
1746 | dir->i_sb->s_dirt = 1; | |
1747 | btrfs_update_inode_block_group(trans, inode); | |
1748 | btrfs_update_inode_block_group(trans, dir); | |
1749 | out_unlock: | |
d3c2fdcf | 1750 | nr = trans->blocks_used; |
39279cc3 | 1751 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1752 | fail: |
39279cc3 CM |
1753 | mutex_unlock(&root->fs_info->fs_mutex); |
1754 | ||
1755 | if (drop_inode) { | |
1756 | inode_dec_link_count(inode); | |
1757 | iput(inode); | |
1758 | } | |
d3c2fdcf | 1759 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1760 | btrfs_throttle(root); |
39279cc3 CM |
1761 | return err; |
1762 | } | |
1763 | ||
1764 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1765 | struct dentry *dentry) | |
1766 | { | |
1767 | struct btrfs_trans_handle *trans; | |
1768 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1769 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1770 | unsigned long nr = 0; |
39279cc3 CM |
1771 | int err; |
1772 | int drop_inode = 0; | |
1773 | ||
1774 | if (inode->i_nlink == 0) | |
1775 | return -ENOENT; | |
1776 | ||
6da6abae CM |
1777 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1778 | inode->i_nlink++; | |
1779 | #else | |
39279cc3 | 1780 | inc_nlink(inode); |
6da6abae | 1781 | #endif |
39279cc3 | 1782 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1783 | err = btrfs_check_free_space(root, 1, 0); |
1784 | if (err) | |
1785 | goto fail; | |
39279cc3 | 1786 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1787 | |
39279cc3 CM |
1788 | btrfs_set_trans_block_group(trans, dir); |
1789 | atomic_inc(&inode->i_count); | |
9c58309d | 1790 | err = btrfs_add_nondir(trans, dentry, inode, 1); |
5f39d397 | 1791 | |
39279cc3 CM |
1792 | if (err) |
1793 | drop_inode = 1; | |
5f39d397 | 1794 | |
39279cc3 CM |
1795 | dir->i_sb->s_dirt = 1; |
1796 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1797 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1798 | |
54aa1f4d CM |
1799 | if (err) |
1800 | drop_inode = 1; | |
39279cc3 | 1801 | |
d3c2fdcf | 1802 | nr = trans->blocks_used; |
39279cc3 | 1803 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1804 | fail: |
39279cc3 CM |
1805 | mutex_unlock(&root->fs_info->fs_mutex); |
1806 | ||
1807 | if (drop_inode) { | |
1808 | inode_dec_link_count(inode); | |
1809 | iput(inode); | |
1810 | } | |
d3c2fdcf | 1811 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1812 | btrfs_throttle(root); |
39279cc3 CM |
1813 | return err; |
1814 | } | |
1815 | ||
39279cc3 CM |
1816 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1817 | { | |
1818 | struct inode *inode; | |
1819 | struct btrfs_trans_handle *trans; | |
1820 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1821 | int err = 0; | |
1822 | int drop_on_err = 0; | |
1823 | u64 objectid; | |
d3c2fdcf | 1824 | unsigned long nr = 1; |
39279cc3 CM |
1825 | |
1826 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1827 | err = btrfs_check_free_space(root, 1, 0); |
1828 | if (err) | |
1829 | goto out_unlock; | |
1830 | ||
39279cc3 CM |
1831 | trans = btrfs_start_transaction(root, 1); |
1832 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1833 | |
39279cc3 CM |
1834 | if (IS_ERR(trans)) { |
1835 | err = PTR_ERR(trans); | |
1836 | goto out_unlock; | |
1837 | } | |
1838 | ||
1839 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1840 | if (err) { | |
1841 | err = -ENOSPC; | |
1842 | goto out_unlock; | |
1843 | } | |
1844 | ||
9c58309d CM |
1845 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1846 | dentry->d_name.len, | |
1847 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
1848 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
1849 | if (IS_ERR(inode)) { | |
1850 | err = PTR_ERR(inode); | |
1851 | goto out_fail; | |
1852 | } | |
5f39d397 | 1853 | |
39279cc3 CM |
1854 | drop_on_err = 1; |
1855 | inode->i_op = &btrfs_dir_inode_operations; | |
1856 | inode->i_fop = &btrfs_dir_file_operations; | |
1857 | btrfs_set_trans_block_group(trans, inode); | |
1858 | ||
3954401f | 1859 | inode->i_size = 0; |
39279cc3 CM |
1860 | err = btrfs_update_inode(trans, root, inode); |
1861 | if (err) | |
1862 | goto out_fail; | |
5f39d397 | 1863 | |
9c58309d | 1864 | err = btrfs_add_link(trans, dentry, inode, 0); |
39279cc3 CM |
1865 | if (err) |
1866 | goto out_fail; | |
5f39d397 | 1867 | |
39279cc3 CM |
1868 | d_instantiate(dentry, inode); |
1869 | drop_on_err = 0; | |
1870 | dir->i_sb->s_dirt = 1; | |
1871 | btrfs_update_inode_block_group(trans, inode); | |
1872 | btrfs_update_inode_block_group(trans, dir); | |
1873 | ||
1874 | out_fail: | |
d3c2fdcf | 1875 | nr = trans->blocks_used; |
39279cc3 | 1876 | btrfs_end_transaction(trans, root); |
5f39d397 | 1877 | |
39279cc3 CM |
1878 | out_unlock: |
1879 | mutex_unlock(&root->fs_info->fs_mutex); | |
1880 | if (drop_on_err) | |
1881 | iput(inode); | |
d3c2fdcf | 1882 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1883 | btrfs_throttle(root); |
39279cc3 CM |
1884 | return err; |
1885 | } | |
1886 | ||
a52d9a80 | 1887 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 1888 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
1889 | int create) |
1890 | { | |
1891 | int ret; | |
1892 | int err = 0; | |
db94535d | 1893 | u64 bytenr; |
a52d9a80 CM |
1894 | u64 extent_start = 0; |
1895 | u64 extent_end = 0; | |
1896 | u64 objectid = inode->i_ino; | |
1897 | u32 found_type; | |
a52d9a80 CM |
1898 | struct btrfs_path *path; |
1899 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1900 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1901 | struct extent_buffer *leaf; |
1902 | struct btrfs_key found_key; | |
a52d9a80 CM |
1903 | struct extent_map *em = NULL; |
1904 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 1905 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
1906 | struct btrfs_trans_handle *trans = NULL; |
1907 | ||
1908 | path = btrfs_alloc_path(); | |
1909 | BUG_ON(!path); | |
1910 | mutex_lock(&root->fs_info->fs_mutex); | |
1911 | ||
1912 | again: | |
d1310b2e CM |
1913 | spin_lock(&em_tree->lock); |
1914 | em = lookup_extent_mapping(em_tree, start, len); | |
1915 | spin_unlock(&em_tree->lock); | |
1916 | ||
a52d9a80 | 1917 | if (em) { |
56b453c9 | 1918 | if (em->start > start) { |
d1310b2e CM |
1919 | printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n", |
1920 | start, len, em->start, em->len); | |
56b453c9 CM |
1921 | WARN_ON(1); |
1922 | } | |
70dec807 CM |
1923 | if (em->block_start == EXTENT_MAP_INLINE && page) |
1924 | free_extent_map(em); | |
1925 | else | |
1926 | goto out; | |
a52d9a80 | 1927 | } |
d1310b2e | 1928 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 1929 | if (!em) { |
d1310b2e CM |
1930 | err = -ENOMEM; |
1931 | goto out; | |
a52d9a80 | 1932 | } |
d1310b2e CM |
1933 | |
1934 | em->start = EXTENT_MAP_HOLE; | |
1935 | em->len = (u64)-1; | |
a52d9a80 | 1936 | em->bdev = inode->i_sb->s_bdev; |
179e29e4 CM |
1937 | ret = btrfs_lookup_file_extent(trans, root, path, |
1938 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1939 | if (ret < 0) { |
1940 | err = ret; | |
1941 | goto out; | |
1942 | } | |
1943 | ||
1944 | if (ret != 0) { | |
1945 | if (path->slots[0] == 0) | |
1946 | goto not_found; | |
1947 | path->slots[0]--; | |
1948 | } | |
1949 | ||
5f39d397 CM |
1950 | leaf = path->nodes[0]; |
1951 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1952 | struct btrfs_file_extent_item); |
a52d9a80 | 1953 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1954 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1955 | found_type = btrfs_key_type(&found_key); | |
1956 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1957 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1958 | goto not_found; | |
1959 | } | |
1960 | ||
5f39d397 CM |
1961 | found_type = btrfs_file_extent_type(leaf, item); |
1962 | extent_start = found_key.offset; | |
a52d9a80 CM |
1963 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1964 | extent_end = extent_start + | |
db94535d | 1965 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1966 | err = 0; |
b888db2b | 1967 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1968 | em->start = start; |
1969 | if (start < extent_start) { | |
d1310b2e | 1970 | if (start + len <= extent_start) |
b888db2b | 1971 | goto not_found; |
d1310b2e | 1972 | em->len = extent_end - extent_start; |
a52d9a80 | 1973 | } else { |
d1310b2e | 1974 | em->len = len; |
a52d9a80 CM |
1975 | } |
1976 | goto not_found_em; | |
1977 | } | |
db94535d CM |
1978 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
1979 | if (bytenr == 0) { | |
a52d9a80 | 1980 | em->start = extent_start; |
d1310b2e | 1981 | em->len = extent_end - extent_start; |
5f39d397 | 1982 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
1983 | goto insert; |
1984 | } | |
db94535d CM |
1985 | bytenr += btrfs_file_extent_offset(leaf, item); |
1986 | em->block_start = bytenr; | |
a52d9a80 | 1987 | em->start = extent_start; |
d1310b2e | 1988 | em->len = extent_end - extent_start; |
a52d9a80 CM |
1989 | goto insert; |
1990 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 1991 | u64 page_start; |
5f39d397 | 1992 | unsigned long ptr; |
a52d9a80 | 1993 | char *map; |
3326d1b0 CM |
1994 | size_t size; |
1995 | size_t extent_offset; | |
1996 | size_t copy_size; | |
a52d9a80 | 1997 | |
5f39d397 CM |
1998 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
1999 | path->slots[0])); | |
d1310b2e CM |
2000 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2001 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2002 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2003 | em->start = start; |
2004 | if (start < extent_start) { | |
d1310b2e | 2005 | if (start + len <= extent_start) |
b888db2b | 2006 | goto not_found; |
d1310b2e | 2007 | em->len = extent_end - extent_start; |
a52d9a80 | 2008 | } else { |
d1310b2e | 2009 | em->len = len; |
a52d9a80 CM |
2010 | } |
2011 | goto not_found_em; | |
2012 | } | |
689f9346 | 2013 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2014 | |
2015 | if (!page) { | |
2016 | em->start = extent_start; | |
d1310b2e | 2017 | em->len = size; |
689f9346 Y |
2018 | goto out; |
2019 | } | |
5f39d397 | 2020 | |
70dec807 CM |
2021 | page_start = page_offset(page) + pg_offset; |
2022 | extent_offset = page_start - extent_start; | |
2023 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2024 | size - extent_offset); |
3326d1b0 | 2025 | em->start = extent_start + extent_offset; |
70dec807 CM |
2026 | em->len = (copy_size + root->sectorsize - 1) & |
2027 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2028 | map = kmap(page); |
2029 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2030 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2031 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2032 | copy_size); |
2033 | flush_dcache_page(page); | |
2034 | } else if (create && PageUptodate(page)) { | |
2035 | if (!trans) { | |
2036 | kunmap(page); | |
2037 | free_extent_map(em); | |
2038 | em = NULL; | |
2039 | btrfs_release_path(root, path); | |
2040 | trans = btrfs_start_transaction(root, 1); | |
2041 | goto again; | |
2042 | } | |
70dec807 | 2043 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2044 | copy_size); |
2045 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2046 | } |
a52d9a80 | 2047 | kunmap(page); |
d1310b2e CM |
2048 | set_extent_uptodate(io_tree, em->start, |
2049 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2050 | goto insert; |
2051 | } else { | |
2052 | printk("unkknown found_type %d\n", found_type); | |
2053 | WARN_ON(1); | |
2054 | } | |
2055 | not_found: | |
2056 | em->start = start; | |
d1310b2e | 2057 | em->len = len; |
a52d9a80 | 2058 | not_found_em: |
5f39d397 | 2059 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2060 | insert: |
2061 | btrfs_release_path(root, path); | |
d1310b2e CM |
2062 | if (em->start > start || extent_map_end(em) <= start) { |
2063 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2064 | err = -EIO; |
2065 | goto out; | |
2066 | } | |
d1310b2e CM |
2067 | |
2068 | err = 0; | |
2069 | spin_lock(&em_tree->lock); | |
a52d9a80 CM |
2070 | ret = add_extent_mapping(em_tree, em); |
2071 | if (ret == -EEXIST) { | |
2072 | free_extent_map(em); | |
d1310b2e CM |
2073 | em = lookup_extent_mapping(em_tree, start, len); |
2074 | if (!em) { | |
a52d9a80 | 2075 | err = -EIO; |
d1310b2e | 2076 | printk("failing to insert %Lu %Lu\n", start, len); |
a52d9a80 | 2077 | } |
a52d9a80 | 2078 | } |
d1310b2e | 2079 | spin_unlock(&em_tree->lock); |
a52d9a80 CM |
2080 | out: |
2081 | btrfs_free_path(path); | |
2082 | if (trans) { | |
2083 | ret = btrfs_end_transaction(trans, root); | |
2084 | if (!err) | |
2085 | err = ret; | |
2086 | } | |
2087 | mutex_unlock(&root->fs_info->fs_mutex); | |
2088 | if (err) { | |
2089 | free_extent_map(em); | |
2090 | WARN_ON(1); | |
2091 | return ERR_PTR(err); | |
2092 | } | |
2093 | return em; | |
2094 | } | |
2095 | ||
d396c6f5 | 2096 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2097 | { |
d396c6f5 | 2098 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2099 | } |
2100 | ||
a52d9a80 | 2101 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2102 | { |
d1310b2e CM |
2103 | struct extent_io_tree *tree; |
2104 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2105 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2106 | } |
1832a6d5 | 2107 | |
a52d9a80 | 2108 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2109 | { |
d1310b2e | 2110 | struct extent_io_tree *tree; |
b888db2b CM |
2111 | |
2112 | ||
2113 | if (current->flags & PF_MEMALLOC) { | |
2114 | redirty_page_for_writepage(wbc, page); | |
2115 | unlock_page(page); | |
2116 | return 0; | |
2117 | } | |
d1310b2e | 2118 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2119 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2120 | } |
2121 | ||
b293f02e CM |
2122 | static int btrfs_writepages(struct address_space *mapping, |
2123 | struct writeback_control *wbc) | |
2124 | { | |
d1310b2e CM |
2125 | struct extent_io_tree *tree; |
2126 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2127 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2128 | } | |
2129 | ||
3ab2fb5a CM |
2130 | static int |
2131 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2132 | struct list_head *pages, unsigned nr_pages) | |
2133 | { | |
d1310b2e CM |
2134 | struct extent_io_tree *tree; |
2135 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2136 | return extent_readpages(tree, mapping, pages, nr_pages, |
2137 | btrfs_get_extent); | |
2138 | } | |
2139 | ||
70dec807 | 2140 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2141 | { |
d1310b2e CM |
2142 | struct extent_io_tree *tree; |
2143 | struct extent_map_tree *map; | |
a52d9a80 | 2144 | int ret; |
8c2383c3 | 2145 | |
d1310b2e CM |
2146 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2147 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2148 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
2149 | if (ret == 1) { |
2150 | ClearPagePrivate(page); | |
2151 | set_page_private(page, 0); | |
2152 | page_cache_release(page); | |
39279cc3 | 2153 | } |
a52d9a80 | 2154 | return ret; |
39279cc3 CM |
2155 | } |
2156 | ||
a52d9a80 | 2157 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2158 | { |
d1310b2e | 2159 | struct extent_io_tree *tree; |
39279cc3 | 2160 | |
d1310b2e | 2161 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 CM |
2162 | extent_invalidatepage(tree, page, offset); |
2163 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
2164 | } |
2165 | ||
9ebefb18 CM |
2166 | /* |
2167 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2168 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2169 | * be careful to check for EOF conditions here. We set the page up correctly | |
2170 | * for a written page which means we get ENOSPC checking when writing into | |
2171 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2172 | * support these features. | |
2173 | * | |
2174 | * We are not allowed to take the i_mutex here so we have to play games to | |
2175 | * protect against truncate races as the page could now be beyond EOF. Because | |
2176 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2177 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2178 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2179 | * unlock the page. | |
2180 | */ | |
2181 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2182 | { | |
6da6abae | 2183 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2184 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2185 | unsigned long end; |
2186 | loff_t size; | |
1832a6d5 | 2187 | int ret; |
a52d9a80 | 2188 | u64 page_start; |
9ebefb18 | 2189 | |
1832a6d5 CM |
2190 | mutex_lock(&root->fs_info->fs_mutex); |
2191 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2192 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2193 | if (ret) |
2194 | goto out; | |
2195 | ||
2196 | ret = -EINVAL; | |
2197 | ||
9ebefb18 CM |
2198 | lock_page(page); |
2199 | wait_on_page_writeback(page); | |
9ebefb18 | 2200 | size = i_size_read(inode); |
35ebb934 | 2201 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2202 | |
9ebefb18 | 2203 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2204 | (page_start > size)) { |
9ebefb18 CM |
2205 | /* page got truncated out from underneath us */ |
2206 | goto out_unlock; | |
2207 | } | |
2208 | ||
2209 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2210 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2211 | end = size & ~PAGE_CACHE_MASK; |
2212 | else | |
2213 | end = PAGE_CACHE_SIZE; | |
2214 | ||
b888db2b | 2215 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2216 | |
2217 | out_unlock: | |
2218 | unlock_page(page); | |
1832a6d5 | 2219 | out: |
9ebefb18 CM |
2220 | return ret; |
2221 | } | |
2222 | ||
39279cc3 CM |
2223 | static void btrfs_truncate(struct inode *inode) |
2224 | { | |
2225 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2226 | int ret; | |
2227 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2228 | unsigned long nr; |
39279cc3 CM |
2229 | |
2230 | if (!S_ISREG(inode->i_mode)) | |
2231 | return; | |
2232 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2233 | return; | |
2234 | ||
2235 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2236 | ||
2237 | mutex_lock(&root->fs_info->fs_mutex); | |
2238 | trans = btrfs_start_transaction(root, 1); | |
2239 | btrfs_set_trans_block_group(trans, inode); | |
2240 | ||
2241 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
85e21bac CM |
2242 | ret = btrfs_truncate_in_trans(trans, root, inode, |
2243 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 2244 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2245 | nr = trans->blocks_used; |
5f39d397 | 2246 | |
39279cc3 CM |
2247 | ret = btrfs_end_transaction(trans, root); |
2248 | BUG_ON(ret); | |
2249 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2250 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2251 | btrfs_throttle(root); |
39279cc3 CM |
2252 | } |
2253 | ||
4313b399 CM |
2254 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2255 | int namelen) | |
39279cc3 CM |
2256 | { |
2257 | struct btrfs_trans_handle *trans; | |
2258 | struct btrfs_key key; | |
2259 | struct btrfs_root_item root_item; | |
2260 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2261 | struct extent_buffer *leaf; |
dc17ff8f | 2262 | struct btrfs_root *new_root = root; |
39279cc3 CM |
2263 | struct inode *inode; |
2264 | struct inode *dir; | |
2265 | int ret; | |
54aa1f4d | 2266 | int err; |
39279cc3 CM |
2267 | u64 objectid; |
2268 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2269 | unsigned long nr = 1; |
39279cc3 CM |
2270 | |
2271 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2272 | ret = btrfs_check_free_space(root, 1, 0); |
2273 | if (ret) | |
2274 | goto fail_commit; | |
2275 | ||
39279cc3 CM |
2276 | trans = btrfs_start_transaction(root, 1); |
2277 | BUG_ON(!trans); | |
2278 | ||
7bb86316 CM |
2279 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2280 | 0, &objectid); | |
2281 | if (ret) | |
2282 | goto fail; | |
2283 | ||
2284 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2285 | objectid, trans->transid, 0, 0, | |
2286 | 0, 0); | |
5f39d397 CM |
2287 | if (IS_ERR(leaf)) |
2288 | return PTR_ERR(leaf); | |
2289 | ||
2290 | btrfs_set_header_nritems(leaf, 0); | |
2291 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2292 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2293 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2294 | btrfs_set_header_owner(leaf, objectid); |
2295 | ||
5f39d397 CM |
2296 | write_extent_buffer(leaf, root->fs_info->fsid, |
2297 | (unsigned long)btrfs_header_fsid(leaf), | |
2298 | BTRFS_FSID_SIZE); | |
2299 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2300 | |
2301 | inode_item = &root_item.inode; | |
2302 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2303 | inode_item->generation = cpu_to_le64(1); |
2304 | inode_item->size = cpu_to_le64(3); | |
2305 | inode_item->nlink = cpu_to_le32(1); | |
2306 | inode_item->nblocks = cpu_to_le64(1); | |
2307 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2308 | |
db94535d CM |
2309 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2310 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2311 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2312 | btrfs_set_root_used(&root_item, 0); |
2313 | ||
5eda7b5e CM |
2314 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2315 | root_item.drop_level = 0; | |
5f39d397 CM |
2316 | |
2317 | free_extent_buffer(leaf); | |
2318 | leaf = NULL; | |
39279cc3 | 2319 | |
39279cc3 CM |
2320 | btrfs_set_root_dirid(&root_item, new_dirid); |
2321 | ||
2322 | key.objectid = objectid; | |
2323 | key.offset = 1; | |
39279cc3 CM |
2324 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2325 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2326 | &root_item); | |
54aa1f4d CM |
2327 | if (ret) |
2328 | goto fail; | |
39279cc3 CM |
2329 | |
2330 | /* | |
2331 | * insert the directory item | |
2332 | */ | |
2333 | key.offset = (u64)-1; | |
2334 | dir = root->fs_info->sb->s_root->d_inode; | |
2335 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2336 | name, namelen, dir->i_ino, &key, | |
2337 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2338 | if (ret) |
2339 | goto fail; | |
39279cc3 | 2340 | |
3954401f CM |
2341 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2342 | name, namelen, objectid, | |
2343 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2344 | if (ret) | |
2345 | goto fail; | |
2346 | ||
39279cc3 | 2347 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2348 | if (ret) |
2349 | goto fail_commit; | |
39279cc3 | 2350 | |
58176a96 | 2351 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2352 | BUG_ON(!new_root); |
2353 | ||
2354 | trans = btrfs_start_transaction(new_root, 1); | |
2355 | BUG_ON(!trans); | |
2356 | ||
9c58309d CM |
2357 | inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid, |
2358 | new_dirid, | |
39279cc3 | 2359 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); |
54aa1f4d CM |
2360 | if (IS_ERR(inode)) |
2361 | goto fail; | |
39279cc3 CM |
2362 | inode->i_op = &btrfs_dir_inode_operations; |
2363 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2364 | new_root->inode = inode; |
39279cc3 | 2365 | |
3954401f CM |
2366 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2367 | new_dirid); | |
39279cc3 | 2368 | inode->i_nlink = 1; |
3954401f | 2369 | inode->i_size = 0; |
39279cc3 | 2370 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2371 | if (ret) |
2372 | goto fail; | |
2373 | fail: | |
d3c2fdcf | 2374 | nr = trans->blocks_used; |
dc17ff8f | 2375 | err = btrfs_commit_transaction(trans, new_root); |
54aa1f4d CM |
2376 | if (err && !ret) |
2377 | ret = err; | |
2378 | fail_commit: | |
39279cc3 | 2379 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2380 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2381 | btrfs_throttle(root); |
54aa1f4d | 2382 | return ret; |
39279cc3 CM |
2383 | } |
2384 | ||
2385 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2386 | { | |
3063d29f | 2387 | struct btrfs_pending_snapshot *pending_snapshot; |
39279cc3 | 2388 | struct btrfs_trans_handle *trans; |
39279cc3 | 2389 | int ret; |
54aa1f4d | 2390 | int err; |
1832a6d5 | 2391 | unsigned long nr = 0; |
39279cc3 CM |
2392 | |
2393 | if (!root->ref_cows) | |
2394 | return -EINVAL; | |
2395 | ||
2396 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2397 | ret = btrfs_check_free_space(root, 1, 0); |
2398 | if (ret) | |
2399 | goto fail_unlock; | |
2400 | ||
3063d29f CM |
2401 | pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); |
2402 | if (!pending_snapshot) { | |
2403 | ret = -ENOMEM; | |
2404 | goto fail_unlock; | |
2405 | } | |
fb4bc1e0 | 2406 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); |
3063d29f CM |
2407 | if (!pending_snapshot->name) { |
2408 | ret = -ENOMEM; | |
2409 | kfree(pending_snapshot); | |
2410 | goto fail_unlock; | |
2411 | } | |
fb4bc1e0 Y |
2412 | memcpy(pending_snapshot->name, name, namelen); |
2413 | pending_snapshot->name[namelen] = '\0'; | |
39279cc3 CM |
2414 | trans = btrfs_start_transaction(root, 1); |
2415 | BUG_ON(!trans); | |
3063d29f CM |
2416 | pending_snapshot->root = root; |
2417 | list_add(&pending_snapshot->list, | |
2418 | &trans->transaction->pending_snapshots); | |
39279cc3 | 2419 | ret = btrfs_update_inode(trans, root, root->inode); |
54aa1f4d | 2420 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2421 | |
1832a6d5 | 2422 | fail_unlock: |
39279cc3 | 2423 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2424 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2425 | btrfs_throttle(root); |
54aa1f4d | 2426 | return ret; |
39279cc3 CM |
2427 | } |
2428 | ||
edbd8d4e | 2429 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2430 | struct file_ra_state *ra, struct file *file, |
2431 | pgoff_t offset, pgoff_t last_index) | |
2432 | { | |
2433 | pgoff_t req_size; | |
2434 | ||
2435 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2436 | req_size = last_index - offset + 1; | |
2437 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2438 | return offset; | |
2439 | #else | |
2440 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2441 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2442 | return offset + req_size; | |
2443 | #endif | |
2444 | } | |
2445 | ||
2446 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2447 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2448 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 2449 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
86479a04 CM |
2450 | struct page *page; |
2451 | unsigned long last_index; | |
2452 | unsigned long ra_index = 0; | |
2453 | u64 page_start; | |
2454 | u64 page_end; | |
2455 | unsigned long i; | |
1832a6d5 CM |
2456 | int ret; |
2457 | ||
2458 | mutex_lock(&root->fs_info->fs_mutex); | |
2459 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2460 | mutex_unlock(&root->fs_info->fs_mutex); | |
2461 | if (ret) | |
2462 | return -ENOSPC; | |
86479a04 CM |
2463 | |
2464 | mutex_lock(&inode->i_mutex); | |
2465 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2466 | for (i = 0; i <= last_index; i++) { | |
2467 | if (i == ra_index) { | |
edbd8d4e CM |
2468 | ra_index = btrfs_force_ra(inode->i_mapping, |
2469 | &file->f_ra, | |
2470 | file, ra_index, last_index); | |
86479a04 CM |
2471 | } |
2472 | page = grab_cache_page(inode->i_mapping, i); | |
2473 | if (!page) | |
2474 | goto out_unlock; | |
2475 | if (!PageUptodate(page)) { | |
2476 | btrfs_readpage(NULL, page); | |
2477 | lock_page(page); | |
2478 | if (!PageUptodate(page)) { | |
2479 | unlock_page(page); | |
2480 | page_cache_release(page); | |
2481 | goto out_unlock; | |
2482 | } | |
2483 | } | |
35ebb934 | 2484 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2485 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2486 | ||
d1310b2e | 2487 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 2488 | set_extent_delalloc(io_tree, page_start, |
86479a04 | 2489 | page_end, GFP_NOFS); |
edbd8d4e | 2490 | |
d1310b2e | 2491 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
86479a04 CM |
2492 | set_page_dirty(page); |
2493 | unlock_page(page); | |
2494 | page_cache_release(page); | |
2495 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2496 | } | |
2497 | ||
2498 | out_unlock: | |
2499 | mutex_unlock(&inode->i_mutex); | |
2500 | return 0; | |
2501 | } | |
2502 | ||
edbd8d4e CM |
2503 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2504 | { | |
2505 | u64 new_size; | |
2506 | u64 old_size; | |
2507 | struct btrfs_ioctl_vol_args *vol_args; | |
2508 | struct btrfs_trans_handle *trans; | |
2509 | char *sizestr; | |
2510 | int ret = 0; | |
2511 | int namelen; | |
2512 | int mod = 0; | |
2513 | ||
2514 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2515 | ||
2516 | if (!vol_args) | |
2517 | return -ENOMEM; | |
2518 | ||
2519 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2520 | ret = -EFAULT; | |
2521 | goto out; | |
2522 | } | |
2523 | namelen = strlen(vol_args->name); | |
2524 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2525 | ret = -EINVAL; | |
2526 | goto out; | |
2527 | } | |
2528 | ||
2529 | sizestr = vol_args->name; | |
2530 | if (!strcmp(sizestr, "max")) | |
2531 | new_size = root->fs_info->sb->s_bdev->bd_inode->i_size; | |
2532 | else { | |
2533 | if (sizestr[0] == '-') { | |
2534 | mod = -1; | |
2535 | sizestr++; | |
2536 | } else if (sizestr[0] == '+') { | |
2537 | mod = 1; | |
2538 | sizestr++; | |
2539 | } | |
2540 | new_size = btrfs_parse_size(sizestr); | |
2541 | if (new_size == 0) { | |
2542 | ret = -EINVAL; | |
2543 | goto out; | |
2544 | } | |
2545 | } | |
2546 | ||
2547 | mutex_lock(&root->fs_info->fs_mutex); | |
2548 | old_size = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
2549 | ||
2550 | if (mod < 0) { | |
2551 | if (new_size > old_size) { | |
2552 | ret = -EINVAL; | |
2553 | goto out_unlock; | |
2554 | } | |
2555 | new_size = old_size - new_size; | |
2556 | } else if (mod > 0) { | |
2557 | new_size = old_size + new_size; | |
2558 | } | |
2559 | ||
2560 | if (new_size < 256 * 1024 * 1024) { | |
2561 | ret = -EINVAL; | |
2562 | goto out_unlock; | |
2563 | } | |
2564 | if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) { | |
2565 | ret = -EFBIG; | |
2566 | goto out_unlock; | |
2567 | } | |
f9ef6604 CM |
2568 | |
2569 | do_div(new_size, root->sectorsize); | |
2570 | new_size *= root->sectorsize; | |
edbd8d4e CM |
2571 | |
2572 | printk("new size is %Lu\n", new_size); | |
2573 | if (new_size > old_size) { | |
2574 | trans = btrfs_start_transaction(root, 1); | |
2575 | ret = btrfs_grow_extent_tree(trans, root, new_size); | |
2576 | btrfs_commit_transaction(trans, root); | |
2577 | } else { | |
2578 | ret = btrfs_shrink_extent_tree(root, new_size); | |
2579 | } | |
2580 | ||
2581 | out_unlock: | |
2582 | mutex_unlock(&root->fs_info->fs_mutex); | |
2583 | out: | |
2584 | kfree(vol_args); | |
2585 | return ret; | |
2586 | } | |
2587 | ||
4313b399 CM |
2588 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
2589 | void __user *arg) | |
39279cc3 | 2590 | { |
4aec2b52 | 2591 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2592 | struct btrfs_dir_item *di; |
39279cc3 CM |
2593 | struct btrfs_path *path; |
2594 | u64 root_dirid; | |
4aec2b52 CM |
2595 | int namelen; |
2596 | int ret; | |
39279cc3 | 2597 | |
4aec2b52 | 2598 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2599 | |
4aec2b52 CM |
2600 | if (!vol_args) |
2601 | return -ENOMEM; | |
2602 | ||
2603 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2604 | ret = -EFAULT; | |
2605 | goto out; | |
2606 | } | |
2607 | ||
2608 | namelen = strlen(vol_args->name); | |
2609 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2610 | ret = -EINVAL; | |
2611 | goto out; | |
2612 | } | |
2613 | if (strchr(vol_args->name, '/')) { | |
2614 | ret = -EINVAL; | |
2615 | goto out; | |
2616 | } | |
d03581f4 CH |
2617 | |
2618 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2619 | if (!path) { |
2620 | ret = -ENOMEM; | |
2621 | goto out; | |
2622 | } | |
d03581f4 CH |
2623 | |
2624 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2625 | mutex_lock(&root->fs_info->fs_mutex); | |
2626 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2627 | path, root_dirid, | |
4aec2b52 | 2628 | vol_args->name, namelen, 0); |
d03581f4 CH |
2629 | mutex_unlock(&root->fs_info->fs_mutex); |
2630 | btrfs_free_path(path); | |
4aec2b52 CM |
2631 | |
2632 | if (di && !IS_ERR(di)) { | |
2633 | ret = -EEXIST; | |
2634 | goto out; | |
2635 | } | |
2636 | ||
2637 | if (IS_ERR(di)) { | |
2638 | ret = PTR_ERR(di); | |
2639 | goto out; | |
2640 | } | |
d03581f4 CH |
2641 | |
2642 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2643 | ret = create_subvol(root, vol_args->name, namelen); |
2644 | else | |
2645 | ret = create_snapshot(root, vol_args->name, namelen); | |
2646 | out: | |
2647 | kfree(vol_args); | |
2648 | return ret; | |
d03581f4 CH |
2649 | } |
2650 | ||
2651 | static int btrfs_ioctl_defrag(struct file *file) | |
2652 | { | |
6da6abae | 2653 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2654 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2655 | ||
2656 | switch (inode->i_mode & S_IFMT) { | |
2657 | case S_IFDIR: | |
39279cc3 | 2658 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2659 | btrfs_defrag_root(root, 0); |
2660 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2661 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2662 | break; |
d03581f4 CH |
2663 | case S_IFREG: |
2664 | btrfs_defrag_file(file); | |
2665 | break; | |
2666 | } | |
2667 | ||
2668 | return 0; | |
2669 | } | |
6702ed49 | 2670 | |
d03581f4 CH |
2671 | long btrfs_ioctl(struct file *file, unsigned int |
2672 | cmd, unsigned long arg) | |
2673 | { | |
6da6abae | 2674 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2675 | |
2676 | switch (cmd) { | |
2677 | case BTRFS_IOC_SNAP_CREATE: | |
2678 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2679 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2680 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
2681 | case BTRFS_IOC_RESIZE: |
2682 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
39279cc3 | 2683 | } |
d03581f4 CH |
2684 | |
2685 | return -ENOTTY; | |
39279cc3 CM |
2686 | } |
2687 | ||
39279cc3 CM |
2688 | /* |
2689 | * Called inside transaction, so use GFP_NOFS | |
2690 | */ | |
2691 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2692 | { | |
2693 | struct btrfs_inode *ei; | |
2694 | ||
2695 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2696 | if (!ei) | |
2697 | return NULL; | |
15ee9bc7 | 2698 | ei->last_trans = 0; |
dc17ff8f | 2699 | ei->ordered_trans = 0; |
39279cc3 CM |
2700 | return &ei->vfs_inode; |
2701 | } | |
2702 | ||
2703 | void btrfs_destroy_inode(struct inode *inode) | |
2704 | { | |
2705 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2706 | WARN_ON(inode->i_data.nrpages); | |
2707 | ||
8c416c9e | 2708 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
2709 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2710 | } | |
2711 | ||
44ec0b71 CM |
2712 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2713 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2714 | #else | |
39279cc3 CM |
2715 | static void init_once(void * foo, struct kmem_cache * cachep, |
2716 | unsigned long flags) | |
44ec0b71 | 2717 | #endif |
39279cc3 CM |
2718 | { |
2719 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2720 | ||
2721 | inode_init_once(&ei->vfs_inode); | |
2722 | } | |
2723 | ||
2724 | void btrfs_destroy_cachep(void) | |
2725 | { | |
2726 | if (btrfs_inode_cachep) | |
2727 | kmem_cache_destroy(btrfs_inode_cachep); | |
2728 | if (btrfs_trans_handle_cachep) | |
2729 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2730 | if (btrfs_transaction_cachep) | |
2731 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2732 | if (btrfs_bit_radix_cachep) | |
2733 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2734 | if (btrfs_path_cachep) | |
2735 | kmem_cache_destroy(btrfs_path_cachep); | |
2736 | } | |
2737 | ||
86479a04 | 2738 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2739 | unsigned long extra_flags, |
44ec0b71 CM |
2740 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2741 | void (*ctor)(struct kmem_cache *, void *) | |
2742 | #else | |
92fee66d | 2743 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2744 | unsigned long) |
2745 | #endif | |
2746 | ) | |
92fee66d CM |
2747 | { |
2748 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2749 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2750 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2751 | ,NULL | |
2752 | #endif | |
2753 | ); | |
2754 | } | |
2755 | ||
39279cc3 CM |
2756 | int btrfs_init_cachep(void) |
2757 | { | |
86479a04 | 2758 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2759 | sizeof(struct btrfs_inode), |
2760 | 0, init_once); | |
39279cc3 CM |
2761 | if (!btrfs_inode_cachep) |
2762 | goto fail; | |
86479a04 CM |
2763 | btrfs_trans_handle_cachep = |
2764 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2765 | sizeof(struct btrfs_trans_handle), | |
2766 | 0, NULL); | |
39279cc3 CM |
2767 | if (!btrfs_trans_handle_cachep) |
2768 | goto fail; | |
86479a04 | 2769 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2770 | sizeof(struct btrfs_transaction), |
92fee66d | 2771 | 0, NULL); |
39279cc3 CM |
2772 | if (!btrfs_transaction_cachep) |
2773 | goto fail; | |
86479a04 | 2774 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2775 | sizeof(struct btrfs_path), |
92fee66d | 2776 | 0, NULL); |
39279cc3 CM |
2777 | if (!btrfs_path_cachep) |
2778 | goto fail; | |
86479a04 | 2779 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2780 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2781 | if (!btrfs_bit_radix_cachep) |
2782 | goto fail; | |
2783 | return 0; | |
2784 | fail: | |
2785 | btrfs_destroy_cachep(); | |
2786 | return -ENOMEM; | |
2787 | } | |
2788 | ||
2789 | static int btrfs_getattr(struct vfsmount *mnt, | |
2790 | struct dentry *dentry, struct kstat *stat) | |
2791 | { | |
2792 | struct inode *inode = dentry->d_inode; | |
2793 | generic_fillattr(inode, stat); | |
d6667462 | 2794 | stat->blksize = PAGE_CACHE_SIZE; |
39279cc3 CM |
2795 | return 0; |
2796 | } | |
2797 | ||
2798 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2799 | struct inode * new_dir,struct dentry *new_dentry) | |
2800 | { | |
2801 | struct btrfs_trans_handle *trans; | |
2802 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2803 | struct inode *new_inode = new_dentry->d_inode; | |
2804 | struct inode *old_inode = old_dentry->d_inode; | |
2805 | struct timespec ctime = CURRENT_TIME; | |
2806 | struct btrfs_path *path; | |
39279cc3 CM |
2807 | int ret; |
2808 | ||
2809 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2810 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2811 | return -ENOTEMPTY; | |
2812 | } | |
5f39d397 | 2813 | |
39279cc3 | 2814 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2815 | ret = btrfs_check_free_space(root, 1, 0); |
2816 | if (ret) | |
2817 | goto out_unlock; | |
2818 | ||
39279cc3 | 2819 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2820 | |
39279cc3 CM |
2821 | btrfs_set_trans_block_group(trans, new_dir); |
2822 | path = btrfs_alloc_path(); | |
2823 | if (!path) { | |
2824 | ret = -ENOMEM; | |
2825 | goto out_fail; | |
2826 | } | |
2827 | ||
2828 | old_dentry->d_inode->i_nlink++; | |
2829 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2830 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2831 | old_inode->i_ctime = ctime; | |
5f39d397 | 2832 | |
39279cc3 CM |
2833 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2834 | if (ret) | |
2835 | goto out_fail; | |
2836 | ||
2837 | if (new_inode) { | |
2838 | new_inode->i_ctime = CURRENT_TIME; | |
2839 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2840 | if (ret) | |
2841 | goto out_fail; | |
39279cc3 | 2842 | } |
9c58309d | 2843 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1); |
39279cc3 CM |
2844 | if (ret) |
2845 | goto out_fail; | |
2846 | ||
2847 | out_fail: | |
2848 | btrfs_free_path(path); | |
2849 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 2850 | out_unlock: |
39279cc3 CM |
2851 | mutex_unlock(&root->fs_info->fs_mutex); |
2852 | return ret; | |
2853 | } | |
2854 | ||
2855 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2856 | const char *symname) | |
2857 | { | |
2858 | struct btrfs_trans_handle *trans; | |
2859 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2860 | struct btrfs_path *path; | |
2861 | struct btrfs_key key; | |
1832a6d5 | 2862 | struct inode *inode = NULL; |
39279cc3 CM |
2863 | int err; |
2864 | int drop_inode = 0; | |
2865 | u64 objectid; | |
2866 | int name_len; | |
2867 | int datasize; | |
5f39d397 | 2868 | unsigned long ptr; |
39279cc3 | 2869 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2870 | struct extent_buffer *leaf; |
1832a6d5 | 2871 | unsigned long nr = 0; |
39279cc3 CM |
2872 | |
2873 | name_len = strlen(symname) + 1; | |
2874 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2875 | return -ENAMETOOLONG; | |
1832a6d5 | 2876 | |
39279cc3 | 2877 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2878 | err = btrfs_check_free_space(root, 1, 0); |
2879 | if (err) | |
2880 | goto out_fail; | |
2881 | ||
39279cc3 CM |
2882 | trans = btrfs_start_transaction(root, 1); |
2883 | btrfs_set_trans_block_group(trans, dir); | |
2884 | ||
2885 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2886 | if (err) { | |
2887 | err = -ENOSPC; | |
2888 | goto out_unlock; | |
2889 | } | |
2890 | ||
9c58309d CM |
2891 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2892 | dentry->d_name.len, | |
2893 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2894 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); |
2895 | err = PTR_ERR(inode); | |
2896 | if (IS_ERR(inode)) | |
2897 | goto out_unlock; | |
2898 | ||
2899 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 2900 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
2901 | if (err) |
2902 | drop_inode = 1; | |
2903 | else { | |
2904 | inode->i_mapping->a_ops = &btrfs_aops; | |
2905 | inode->i_fop = &btrfs_file_operations; | |
2906 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
2907 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2908 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 2909 | inode->i_mapping, GFP_NOFS); |
d1310b2e | 2910 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
2911 | } |
2912 | dir->i_sb->s_dirt = 1; | |
2913 | btrfs_update_inode_block_group(trans, inode); | |
2914 | btrfs_update_inode_block_group(trans, dir); | |
2915 | if (drop_inode) | |
2916 | goto out_unlock; | |
2917 | ||
2918 | path = btrfs_alloc_path(); | |
2919 | BUG_ON(!path); | |
2920 | key.objectid = inode->i_ino; | |
2921 | key.offset = 0; | |
39279cc3 CM |
2922 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2923 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2924 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2925 | datasize); | |
54aa1f4d CM |
2926 | if (err) { |
2927 | drop_inode = 1; | |
2928 | goto out_unlock; | |
2929 | } | |
5f39d397 CM |
2930 | leaf = path->nodes[0]; |
2931 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2932 | struct btrfs_file_extent_item); | |
2933 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2934 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2935 | BTRFS_FILE_EXTENT_INLINE); |
2936 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2937 | write_extent_buffer(leaf, symname, ptr, name_len); |
2938 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2939 | btrfs_free_path(path); |
5f39d397 | 2940 | |
39279cc3 CM |
2941 | inode->i_op = &btrfs_symlink_inode_operations; |
2942 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2943 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2944 | err = btrfs_update_inode(trans, root, inode); |
2945 | if (err) | |
2946 | drop_inode = 1; | |
39279cc3 CM |
2947 | |
2948 | out_unlock: | |
d3c2fdcf | 2949 | nr = trans->blocks_used; |
39279cc3 | 2950 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2951 | out_fail: |
39279cc3 | 2952 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
2953 | if (drop_inode) { |
2954 | inode_dec_link_count(inode); | |
2955 | iput(inode); | |
2956 | } | |
d3c2fdcf | 2957 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2958 | btrfs_throttle(root); |
39279cc3 CM |
2959 | return err; |
2960 | } | |
fdebe2bd Y |
2961 | static int btrfs_permission(struct inode *inode, int mask, |
2962 | struct nameidata *nd) | |
2963 | { | |
2964 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
2965 | return -EACCES; | |
2966 | return generic_permission(inode, mask, NULL); | |
2967 | } | |
39279cc3 CM |
2968 | |
2969 | static struct inode_operations btrfs_dir_inode_operations = { | |
2970 | .lookup = btrfs_lookup, | |
2971 | .create = btrfs_create, | |
2972 | .unlink = btrfs_unlink, | |
2973 | .link = btrfs_link, | |
2974 | .mkdir = btrfs_mkdir, | |
2975 | .rmdir = btrfs_rmdir, | |
2976 | .rename = btrfs_rename, | |
2977 | .symlink = btrfs_symlink, | |
2978 | .setattr = btrfs_setattr, | |
618e21d5 | 2979 | .mknod = btrfs_mknod, |
5103e947 JB |
2980 | .setxattr = generic_setxattr, |
2981 | .getxattr = generic_getxattr, | |
2982 | .listxattr = btrfs_listxattr, | |
2983 | .removexattr = generic_removexattr, | |
fdebe2bd | 2984 | .permission = btrfs_permission, |
39279cc3 | 2985 | }; |
39279cc3 CM |
2986 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
2987 | .lookup = btrfs_lookup, | |
fdebe2bd | 2988 | .permission = btrfs_permission, |
39279cc3 | 2989 | }; |
39279cc3 CM |
2990 | static struct file_operations btrfs_dir_file_operations = { |
2991 | .llseek = generic_file_llseek, | |
2992 | .read = generic_read_dir, | |
2993 | .readdir = btrfs_readdir, | |
34287aa3 | 2994 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 2995 | #ifdef CONFIG_COMPAT |
34287aa3 | 2996 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
2997 | #endif |
2998 | }; | |
2999 | ||
d1310b2e | 3000 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac CM |
3001 | .fill_delalloc = run_delalloc_range, |
3002 | .writepage_io_hook = btrfs_writepage_io_hook, | |
3003 | .readpage_io_hook = btrfs_readpage_io_hook, | |
3004 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
3005 | }; | |
3006 | ||
39279cc3 CM |
3007 | static struct address_space_operations btrfs_aops = { |
3008 | .readpage = btrfs_readpage, | |
3009 | .writepage = btrfs_writepage, | |
b293f02e | 3010 | .writepages = btrfs_writepages, |
3ab2fb5a | 3011 | .readpages = btrfs_readpages, |
39279cc3 | 3012 | .sync_page = block_sync_page, |
39279cc3 | 3013 | .bmap = btrfs_bmap, |
a52d9a80 CM |
3014 | .invalidatepage = btrfs_invalidatepage, |
3015 | .releasepage = btrfs_releasepage, | |
3016 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
3017 | }; |
3018 | ||
3019 | static struct address_space_operations btrfs_symlink_aops = { | |
3020 | .readpage = btrfs_readpage, | |
3021 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3022 | .invalidatepage = btrfs_invalidatepage, |
3023 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3024 | }; |
3025 | ||
3026 | static struct inode_operations btrfs_file_inode_operations = { | |
3027 | .truncate = btrfs_truncate, | |
3028 | .getattr = btrfs_getattr, | |
3029 | .setattr = btrfs_setattr, | |
5103e947 JB |
3030 | .setxattr = generic_setxattr, |
3031 | .getxattr = generic_getxattr, | |
3032 | .listxattr = btrfs_listxattr, | |
3033 | .removexattr = generic_removexattr, | |
fdebe2bd | 3034 | .permission = btrfs_permission, |
39279cc3 | 3035 | }; |
618e21d5 JB |
3036 | static struct inode_operations btrfs_special_inode_operations = { |
3037 | .getattr = btrfs_getattr, | |
3038 | .setattr = btrfs_setattr, | |
fdebe2bd | 3039 | .permission = btrfs_permission, |
618e21d5 | 3040 | }; |
39279cc3 CM |
3041 | static struct inode_operations btrfs_symlink_inode_operations = { |
3042 | .readlink = generic_readlink, | |
3043 | .follow_link = page_follow_link_light, | |
3044 | .put_link = page_put_link, | |
fdebe2bd | 3045 | .permission = btrfs_permission, |
39279cc3 | 3046 | }; |