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 | ||
065631f6 | 19 | #include <linux/bio.h> |
39279cc3 CM |
20 | #include <linux/buffer_head.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/highmem.h> | |
24 | #include <linux/time.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/smp_lock.h> | |
28 | #include <linux/backing-dev.h> | |
29 | #include <linux/mpage.h> | |
30 | #include <linux/swap.h> | |
31 | #include <linux/writeback.h> | |
32 | #include <linux/statfs.h> | |
33 | #include <linux/compat.h> | |
9ebefb18 | 34 | #include <linux/bit_spinlock.h> |
92fee66d | 35 | #include <linux/version.h> |
5103e947 | 36 | #include <linux/xattr.h> |
39279cc3 CM |
37 | #include "ctree.h" |
38 | #include "disk-io.h" | |
39 | #include "transaction.h" | |
40 | #include "btrfs_inode.h" | |
41 | #include "ioctl.h" | |
42 | #include "print-tree.h" | |
0b86a832 | 43 | #include "volumes.h" |
39279cc3 CM |
44 | |
45 | struct btrfs_iget_args { | |
46 | u64 ino; | |
47 | struct btrfs_root *root; | |
48 | }; | |
49 | ||
50 | static struct inode_operations btrfs_dir_inode_operations; | |
51 | static struct inode_operations btrfs_symlink_inode_operations; | |
52 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 53 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
54 | static struct inode_operations btrfs_file_inode_operations; |
55 | static struct address_space_operations btrfs_aops; | |
56 | static struct address_space_operations btrfs_symlink_aops; | |
57 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 58 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
59 | |
60 | static struct kmem_cache *btrfs_inode_cachep; | |
61 | struct kmem_cache *btrfs_trans_handle_cachep; | |
62 | struct kmem_cache *btrfs_transaction_cachep; | |
63 | struct kmem_cache *btrfs_bit_radix_cachep; | |
64 | struct kmem_cache *btrfs_path_cachep; | |
65 | ||
66 | #define S_SHIFT 12 | |
67 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
68 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
69 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
70 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
71 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
72 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
73 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
74 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
75 | }; | |
76 | ||
1832a6d5 CM |
77 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
78 | int for_del) | |
79 | { | |
80 | u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
81 | u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
82 | u64 thresh; | |
83 | int ret = 0; | |
84 | ||
85 | if (for_del) | |
f9ef6604 | 86 | thresh = total * 90; |
1832a6d5 | 87 | else |
f9ef6604 CM |
88 | thresh = total * 85; |
89 | ||
90 | do_div(thresh, 100); | |
1832a6d5 CM |
91 | |
92 | spin_lock(&root->fs_info->delalloc_lock); | |
93 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
94 | ret = -ENOSPC; | |
95 | spin_unlock(&root->fs_info->delalloc_lock); | |
96 | return ret; | |
97 | } | |
98 | ||
be20aa9d | 99 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
100 | { |
101 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
102 | struct btrfs_trans_handle *trans; | |
b888db2b | 103 | u64 alloc_hint = 0; |
db94535d | 104 | u64 num_bytes; |
c59f8951 | 105 | u64 cur_alloc_size; |
db94535d | 106 | u64 blocksize = root->sectorsize; |
d1310b2e CM |
107 | u64 orig_start = start; |
108 | u64 orig_num_bytes; | |
be20aa9d CM |
109 | struct btrfs_key ins; |
110 | int ret; | |
b888db2b | 111 | |
b888db2b | 112 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 113 | BUG_ON(!trans); |
be20aa9d CM |
114 | btrfs_set_trans_block_group(trans, inode); |
115 | ||
db94535d | 116 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 117 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 118 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 119 | start, start + num_bytes, start, &alloc_hint); |
d1310b2e | 120 | orig_num_bytes = num_bytes; |
db94535d | 121 | |
179e29e4 CM |
122 | if (alloc_hint == EXTENT_MAP_INLINE) |
123 | goto out; | |
124 | ||
c59f8951 CM |
125 | while(num_bytes > 0) { |
126 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
127 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
128 | root->root_key.objectid, | |
129 | trans->transid, | |
130 | inode->i_ino, start, 0, | |
131 | alloc_hint, (u64)-1, &ins, 1); | |
132 | if (ret) { | |
133 | WARN_ON(1); | |
134 | goto out; | |
135 | } | |
136 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
137 | start, ins.objectid, ins.offset, | |
138 | ins.offset); | |
9069218d | 139 | inode->i_blocks += ins.offset >> 9; |
5f56406a | 140 | btrfs_check_file(root, inode); |
c59f8951 CM |
141 | num_bytes -= cur_alloc_size; |
142 | alloc_hint = ins.objectid + ins.offset; | |
143 | start += cur_alloc_size; | |
b888db2b | 144 | } |
d1310b2e CM |
145 | btrfs_drop_extent_cache(inode, orig_start, |
146 | orig_start + orig_num_bytes - 1); | |
dc17ff8f | 147 | btrfs_add_ordered_inode(inode); |
9069218d | 148 | btrfs_update_inode(trans, root, inode); |
b888db2b CM |
149 | out: |
150 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
151 | return ret; |
152 | } | |
153 | ||
154 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
155 | { | |
156 | u64 extent_start; | |
157 | u64 extent_end; | |
158 | u64 bytenr; | |
159 | u64 cow_end; | |
1832a6d5 | 160 | u64 loops = 0; |
c31f8830 | 161 | u64 total_fs_bytes; |
be20aa9d CM |
162 | struct btrfs_root *root = BTRFS_I(inode)->root; |
163 | struct extent_buffer *leaf; | |
164 | int found_type; | |
165 | struct btrfs_path *path; | |
166 | struct btrfs_file_extent_item *item; | |
167 | int ret; | |
168 | int err; | |
169 | struct btrfs_key found_key; | |
170 | ||
c31f8830 | 171 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
172 | path = btrfs_alloc_path(); |
173 | BUG_ON(!path); | |
174 | again: | |
175 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
176 | inode->i_ino, start, 0); | |
177 | if (ret < 0) { | |
178 | btrfs_free_path(path); | |
179 | return ret; | |
180 | } | |
181 | ||
182 | cow_end = end; | |
183 | if (ret != 0) { | |
184 | if (path->slots[0] == 0) | |
185 | goto not_found; | |
186 | path->slots[0]--; | |
187 | } | |
188 | ||
189 | leaf = path->nodes[0]; | |
190 | item = btrfs_item_ptr(leaf, path->slots[0], | |
191 | struct btrfs_file_extent_item); | |
192 | ||
193 | /* are we inside the extent that was found? */ | |
194 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
195 | found_type = btrfs_key_type(&found_key); | |
196 | if (found_key.objectid != inode->i_ino || | |
197 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
198 | goto not_found; | |
199 | } | |
200 | ||
201 | found_type = btrfs_file_extent_type(leaf, item); | |
202 | extent_start = found_key.offset; | |
203 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
204 | u64 extent_num_bytes; |
205 | ||
206 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
207 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
208 | err = 0; |
209 | ||
1832a6d5 CM |
210 | if (loops && start != extent_start) |
211 | goto not_found; | |
212 | ||
be20aa9d CM |
213 | if (start < extent_start || start >= extent_end) |
214 | goto not_found; | |
215 | ||
216 | cow_end = min(end, extent_end - 1); | |
217 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
218 | if (bytenr == 0) | |
219 | goto not_found; | |
220 | ||
c31f8830 CM |
221 | /* |
222 | * we may be called by the resizer, make sure we're inside | |
223 | * the limits of the FS | |
224 | */ | |
225 | if (bytenr + extent_num_bytes > total_fs_bytes) | |
226 | goto not_found; | |
227 | ||
be20aa9d CM |
228 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
229 | goto not_found; | |
230 | } | |
231 | ||
232 | start = extent_end; | |
bd09835d | 233 | } else { |
be20aa9d CM |
234 | goto not_found; |
235 | } | |
236 | loop: | |
237 | if (start > end) { | |
238 | btrfs_free_path(path); | |
239 | return 0; | |
240 | } | |
241 | btrfs_release_path(root, path); | |
1832a6d5 | 242 | loops++; |
be20aa9d CM |
243 | goto again; |
244 | ||
245 | not_found: | |
246 | cow_file_range(inode, start, cow_end); | |
247 | start = cow_end + 1; | |
248 | goto loop; | |
249 | } | |
250 | ||
251 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
252 | { | |
253 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
254 | int ret; | |
be20aa9d | 255 | mutex_lock(&root->fs_info->fs_mutex); |
b98b6767 Y |
256 | if (btrfs_test_opt(root, NODATACOW) || |
257 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
258 | ret = run_delalloc_nocow(inode, start, end); |
259 | else | |
260 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 261 | |
b888db2b CM |
262 | mutex_unlock(&root->fs_info->fs_mutex); |
263 | return ret; | |
264 | } | |
265 | ||
291d673e | 266 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 267 | unsigned long old, unsigned long bits) |
291d673e | 268 | { |
b0c68f8b | 269 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e CM |
270 | struct btrfs_root *root = BTRFS_I(inode)->root; |
271 | spin_lock(&root->fs_info->delalloc_lock); | |
9069218d | 272 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e CM |
273 | root->fs_info->delalloc_bytes += end - start + 1; |
274 | spin_unlock(&root->fs_info->delalloc_lock); | |
275 | } | |
276 | return 0; | |
277 | } | |
278 | ||
279 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 280 | unsigned long old, unsigned long bits) |
291d673e | 281 | { |
b0c68f8b | 282 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e CM |
283 | struct btrfs_root *root = BTRFS_I(inode)->root; |
284 | spin_lock(&root->fs_info->delalloc_lock); | |
b0c68f8b CM |
285 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
286 | printk("warning: delalloc account %Lu %Lu\n", | |
287 | end - start + 1, root->fs_info->delalloc_bytes); | |
288 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 289 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
290 | } else { |
291 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 292 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 293 | } |
291d673e CM |
294 | spin_unlock(&root->fs_info->delalloc_lock); |
295 | } | |
296 | return 0; | |
297 | } | |
298 | ||
0b86a832 | 299 | int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio) |
065631f6 | 300 | { |
065631f6 CM |
301 | struct btrfs_root *root = BTRFS_I(inode)->root; |
302 | struct btrfs_trans_handle *trans; | |
303 | int ret = 0; | |
304 | ||
0b86a832 CM |
305 | if (rw != WRITE) { |
306 | goto mapit; | |
307 | } | |
065631f6 CM |
308 | |
309 | if (btrfs_test_opt(root, NODATASUM) || | |
0b86a832 CM |
310 | btrfs_test_flag(inode, NODATASUM)) { |
311 | goto mapit; | |
312 | } | |
065631f6 CM |
313 | |
314 | mutex_lock(&root->fs_info->fs_mutex); | |
315 | trans = btrfs_start_transaction(root, 1); | |
316 | btrfs_set_trans_block_group(trans, inode); | |
317 | btrfs_csum_file_blocks(trans, root, inode, bio); | |
318 | ret = btrfs_end_transaction(trans, root); | |
319 | BUG_ON(ret); | |
320 | mutex_unlock(&root->fs_info->fs_mutex); | |
0b86a832 CM |
321 | mapit: |
322 | return btrfs_map_bio(root, rw, bio); | |
065631f6 | 323 | } |
6885f308 | 324 | |
07157aac CM |
325 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) |
326 | { | |
327 | int ret = 0; | |
328 | struct inode *inode = page->mapping->host; | |
329 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 330 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
331 | struct btrfs_csum_item *item; |
332 | struct btrfs_path *path = NULL; | |
ff79f819 | 333 | u32 csum; |
b98b6767 Y |
334 | if (btrfs_test_opt(root, NODATASUM) || |
335 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 336 | return 0; |
07157aac CM |
337 | mutex_lock(&root->fs_info->fs_mutex); |
338 | path = btrfs_alloc_path(); | |
339 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
340 | if (IS_ERR(item)) { | |
341 | ret = PTR_ERR(item); | |
342 | /* a csum that isn't present is a preallocated region. */ | |
343 | if (ret == -ENOENT || ret == -EFBIG) | |
344 | ret = 0; | |
ff79f819 | 345 | csum = 0; |
aadfeb6e | 346 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start); |
07157aac CM |
347 | goto out; |
348 | } | |
ff79f819 CM |
349 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
350 | BTRFS_CRC32_SIZE); | |
d1310b2e | 351 | set_state_private(io_tree, start, csum); |
07157aac CM |
352 | out: |
353 | if (path) | |
354 | btrfs_free_path(path); | |
355 | mutex_unlock(&root->fs_info->fs_mutex); | |
356 | return ret; | |
357 | } | |
358 | ||
70dec807 CM |
359 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
360 | struct extent_state *state) | |
07157aac | 361 | { |
35ebb934 | 362 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 363 | struct inode *inode = page->mapping->host; |
d1310b2e | 364 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 365 | char *kaddr; |
aadfeb6e | 366 | u64 private = ~(u32)0; |
07157aac | 367 | int ret; |
ff79f819 CM |
368 | struct btrfs_root *root = BTRFS_I(inode)->root; |
369 | u32 csum = ~(u32)0; | |
bbf0d006 | 370 | unsigned long flags; |
d1310b2e | 371 | |
b98b6767 Y |
372 | if (btrfs_test_opt(root, NODATASUM) || |
373 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 374 | return 0; |
c2e639f0 | 375 | if (state && state->start == start) { |
70dec807 CM |
376 | private = state->private; |
377 | ret = 0; | |
378 | } else { | |
379 | ret = get_state_private(io_tree, start, &private); | |
380 | } | |
bbf0d006 | 381 | local_irq_save(flags); |
07157aac CM |
382 | kaddr = kmap_atomic(page, KM_IRQ0); |
383 | if (ret) { | |
384 | goto zeroit; | |
385 | } | |
ff79f819 CM |
386 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
387 | btrfs_csum_final(csum, (char *)&csum); | |
388 | if (csum != private) { | |
07157aac CM |
389 | goto zeroit; |
390 | } | |
391 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 392 | local_irq_restore(flags); |
07157aac CM |
393 | return 0; |
394 | ||
395 | zeroit: | |
aadfeb6e CM |
396 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
397 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
398 | private); | |
db94535d CM |
399 | memset(kaddr + offset, 1, end - start + 1); |
400 | flush_dcache_page(page); | |
07157aac | 401 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 402 | local_irq_restore(flags); |
07157aac CM |
403 | return 0; |
404 | } | |
b888db2b | 405 | |
39279cc3 CM |
406 | void btrfs_read_locked_inode(struct inode *inode) |
407 | { | |
408 | struct btrfs_path *path; | |
5f39d397 | 409 | struct extent_buffer *leaf; |
39279cc3 | 410 | struct btrfs_inode_item *inode_item; |
0b86a832 | 411 | struct btrfs_timespec *tspec; |
39279cc3 CM |
412 | struct btrfs_root *root = BTRFS_I(inode)->root; |
413 | struct btrfs_key location; | |
414 | u64 alloc_group_block; | |
618e21d5 | 415 | u32 rdev; |
39279cc3 CM |
416 | int ret; |
417 | ||
418 | path = btrfs_alloc_path(); | |
419 | BUG_ON(!path); | |
39279cc3 | 420 | mutex_lock(&root->fs_info->fs_mutex); |
39279cc3 | 421 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 422 | |
39279cc3 | 423 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 424 | if (ret) |
39279cc3 | 425 | goto make_bad; |
39279cc3 | 426 | |
5f39d397 CM |
427 | leaf = path->nodes[0]; |
428 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
429 | struct btrfs_inode_item); | |
430 | ||
431 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
432 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
433 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
434 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
435 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
436 | ||
437 | tspec = btrfs_inode_atime(inode_item); | |
438 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
439 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
440 | ||
441 | tspec = btrfs_inode_mtime(inode_item); | |
442 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
443 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
444 | ||
445 | tspec = btrfs_inode_ctime(inode_item); | |
446 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
447 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
448 | ||
449 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
450 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 451 | inode->i_rdev = 0; |
5f39d397 CM |
452 | rdev = btrfs_inode_rdev(leaf, inode_item); |
453 | ||
454 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
455 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
456 | alloc_group_block); | |
b98b6767 | 457 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
458 | if (!BTRFS_I(inode)->block_group) { |
459 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
0b86a832 CM |
460 | NULL, 0, |
461 | BTRFS_BLOCK_GROUP_METADATA, 0); | |
e52ec0eb | 462 | } |
39279cc3 CM |
463 | btrfs_free_path(path); |
464 | inode_item = NULL; | |
465 | ||
466 | mutex_unlock(&root->fs_info->fs_mutex); | |
467 | ||
468 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
469 | case S_IFREG: |
470 | inode->i_mapping->a_ops = &btrfs_aops; | |
d1310b2e | 471 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
472 | inode->i_fop = &btrfs_file_operations; |
473 | inode->i_op = &btrfs_file_inode_operations; | |
474 | break; | |
475 | case S_IFDIR: | |
476 | inode->i_fop = &btrfs_dir_file_operations; | |
477 | if (root == root->fs_info->tree_root) | |
478 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
479 | else | |
480 | inode->i_op = &btrfs_dir_inode_operations; | |
481 | break; | |
482 | case S_IFLNK: | |
483 | inode->i_op = &btrfs_symlink_inode_operations; | |
484 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
485 | break; | |
618e21d5 JB |
486 | default: |
487 | init_special_inode(inode, inode->i_mode, rdev); | |
488 | break; | |
39279cc3 CM |
489 | } |
490 | return; | |
491 | ||
492 | make_bad: | |
493 | btrfs_release_path(root, path); | |
494 | btrfs_free_path(path); | |
495 | mutex_unlock(&root->fs_info->fs_mutex); | |
496 | make_bad_inode(inode); | |
497 | } | |
498 | ||
5f39d397 CM |
499 | static void fill_inode_item(struct extent_buffer *leaf, |
500 | struct btrfs_inode_item *item, | |
39279cc3 CM |
501 | struct inode *inode) |
502 | { | |
5f39d397 CM |
503 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
504 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
505 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
506 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
507 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
508 | ||
509 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
510 | inode->i_atime.tv_sec); | |
511 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
512 | inode->i_atime.tv_nsec); | |
513 | ||
514 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
515 | inode->i_mtime.tv_sec); | |
516 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
517 | inode->i_mtime.tv_nsec); | |
518 | ||
519 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
520 | inode->i_ctime.tv_sec); | |
521 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
522 | inode->i_ctime.tv_nsec); | |
523 | ||
524 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
525 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
526 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 527 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 528 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
529 | BTRFS_I(inode)->block_group->key.objectid); |
530 | } | |
531 | ||
a52d9a80 | 532 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
533 | struct btrfs_root *root, |
534 | struct inode *inode) | |
535 | { | |
536 | struct btrfs_inode_item *inode_item; | |
537 | struct btrfs_path *path; | |
5f39d397 | 538 | struct extent_buffer *leaf; |
39279cc3 CM |
539 | int ret; |
540 | ||
541 | path = btrfs_alloc_path(); | |
542 | BUG_ON(!path); | |
39279cc3 CM |
543 | ret = btrfs_lookup_inode(trans, root, path, |
544 | &BTRFS_I(inode)->location, 1); | |
545 | if (ret) { | |
546 | if (ret > 0) | |
547 | ret = -ENOENT; | |
548 | goto failed; | |
549 | } | |
550 | ||
5f39d397 CM |
551 | leaf = path->nodes[0]; |
552 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
553 | struct btrfs_inode_item); |
554 | ||
5f39d397 CM |
555 | fill_inode_item(leaf, inode_item, inode); |
556 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 557 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
558 | ret = 0; |
559 | failed: | |
560 | btrfs_release_path(root, path); | |
561 | btrfs_free_path(path); | |
562 | return ret; | |
563 | } | |
564 | ||
565 | ||
566 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
567 | struct btrfs_root *root, | |
568 | struct inode *dir, | |
569 | struct dentry *dentry) | |
570 | { | |
571 | struct btrfs_path *path; | |
572 | const char *name = dentry->d_name.name; | |
573 | int name_len = dentry->d_name.len; | |
574 | int ret = 0; | |
5f39d397 | 575 | struct extent_buffer *leaf; |
39279cc3 | 576 | struct btrfs_dir_item *di; |
5f39d397 | 577 | struct btrfs_key key; |
39279cc3 CM |
578 | |
579 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
580 | if (!path) { |
581 | ret = -ENOMEM; | |
582 | goto err; | |
583 | } | |
584 | ||
39279cc3 CM |
585 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
586 | name, name_len, -1); | |
587 | if (IS_ERR(di)) { | |
588 | ret = PTR_ERR(di); | |
589 | goto err; | |
590 | } | |
591 | if (!di) { | |
592 | ret = -ENOENT; | |
593 | goto err; | |
594 | } | |
5f39d397 CM |
595 | leaf = path->nodes[0]; |
596 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 597 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
598 | if (ret) |
599 | goto err; | |
39279cc3 CM |
600 | btrfs_release_path(root, path); |
601 | ||
602 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 603 | key.objectid, name, name_len, -1); |
39279cc3 CM |
604 | if (IS_ERR(di)) { |
605 | ret = PTR_ERR(di); | |
606 | goto err; | |
607 | } | |
608 | if (!di) { | |
609 | ret = -ENOENT; | |
610 | goto err; | |
611 | } | |
612 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
613 | |
614 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
615 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
616 | dentry->d_inode->i_ino, | |
617 | dentry->d_parent->d_inode->i_ino); | |
618 | if (ret) { | |
619 | printk("failed to delete reference to %.*s, " | |
620 | "inode %lu parent %lu\n", name_len, name, | |
621 | dentry->d_inode->i_ino, | |
622 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 623 | } |
39279cc3 CM |
624 | err: |
625 | btrfs_free_path(path); | |
626 | if (!ret) { | |
627 | dir->i_size -= name_len * 2; | |
79c44584 | 628 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 629 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
630 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
631 | dentry->d_inode->i_nlink--; | |
632 | #else | |
39279cc3 | 633 | drop_nlink(dentry->d_inode); |
6da6abae | 634 | #endif |
54aa1f4d | 635 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
636 | dir->i_sb->s_dirt = 1; |
637 | } | |
638 | return ret; | |
639 | } | |
640 | ||
641 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
642 | { | |
643 | struct btrfs_root *root; | |
644 | struct btrfs_trans_handle *trans; | |
2da98f00 | 645 | struct inode *inode = dentry->d_inode; |
39279cc3 | 646 | int ret; |
1832a6d5 | 647 | unsigned long nr = 0; |
39279cc3 CM |
648 | |
649 | root = BTRFS_I(dir)->root; | |
650 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
651 | |
652 | ret = btrfs_check_free_space(root, 1, 1); | |
653 | if (ret) | |
654 | goto fail; | |
655 | ||
39279cc3 | 656 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 657 | |
39279cc3 CM |
658 | btrfs_set_trans_block_group(trans, dir); |
659 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 660 | nr = trans->blocks_used; |
5f39d397 | 661 | |
2da98f00 CM |
662 | if (inode->i_nlink == 0) { |
663 | int found; | |
664 | /* if the inode isn't linked anywhere, | |
665 | * we don't need to worry about | |
666 | * data=ordered | |
667 | */ | |
668 | found = btrfs_del_ordered_inode(inode); | |
669 | if (found == 1) { | |
670 | atomic_dec(&inode->i_count); | |
671 | } | |
672 | } | |
673 | ||
39279cc3 | 674 | btrfs_end_transaction(trans, root); |
1832a6d5 | 675 | fail: |
39279cc3 | 676 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 677 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 678 | btrfs_throttle(root); |
39279cc3 CM |
679 | return ret; |
680 | } | |
681 | ||
682 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
683 | { | |
684 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 685 | int err = 0; |
39279cc3 CM |
686 | int ret; |
687 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 688 | struct btrfs_trans_handle *trans; |
1832a6d5 | 689 | unsigned long nr = 0; |
39279cc3 | 690 | |
134d4512 Y |
691 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
692 | return -ENOTEMPTY; | |
693 | ||
39279cc3 | 694 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
695 | ret = btrfs_check_free_space(root, 1, 1); |
696 | if (ret) | |
697 | goto fail; | |
698 | ||
39279cc3 CM |
699 | trans = btrfs_start_transaction(root, 1); |
700 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
701 | |
702 | /* now the directory is empty */ | |
703 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
704 | if (!err) { | |
705 | inode->i_size = 0; | |
706 | } | |
3954401f | 707 | |
d3c2fdcf | 708 | nr = trans->blocks_used; |
39279cc3 | 709 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 710 | fail: |
134d4512 | 711 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 712 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 713 | btrfs_throttle(root); |
3954401f | 714 | |
39279cc3 CM |
715 | if (ret && !err) |
716 | err = ret; | |
717 | return err; | |
718 | } | |
719 | ||
39279cc3 CM |
720 | /* |
721 | * this can truncate away extent items, csum items and directory items. | |
722 | * It starts at a high offset and removes keys until it can't find | |
723 | * any higher than i_size. | |
724 | * | |
725 | * csum items that cross the new i_size are truncated to the new size | |
726 | * as well. | |
727 | */ | |
728 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
729 | struct btrfs_root *root, | |
85e21bac CM |
730 | struct inode *inode, |
731 | u32 min_type) | |
39279cc3 CM |
732 | { |
733 | int ret; | |
734 | struct btrfs_path *path; | |
735 | struct btrfs_key key; | |
5f39d397 | 736 | struct btrfs_key found_key; |
39279cc3 | 737 | u32 found_type; |
5f39d397 | 738 | struct extent_buffer *leaf; |
39279cc3 CM |
739 | struct btrfs_file_extent_item *fi; |
740 | u64 extent_start = 0; | |
db94535d | 741 | u64 extent_num_bytes = 0; |
39279cc3 | 742 | u64 item_end = 0; |
7bb86316 | 743 | u64 root_gen = 0; |
d8d5f3e1 | 744 | u64 root_owner = 0; |
39279cc3 CM |
745 | int found_extent; |
746 | int del_item; | |
85e21bac CM |
747 | int pending_del_nr = 0; |
748 | int pending_del_slot = 0; | |
179e29e4 | 749 | int extent_type = -1; |
39279cc3 | 750 | |
a52d9a80 | 751 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 752 | path = btrfs_alloc_path(); |
3c69faec | 753 | path->reada = -1; |
39279cc3 | 754 | BUG_ON(!path); |
5f39d397 | 755 | |
39279cc3 CM |
756 | /* FIXME, add redo link to tree so we don't leak on crash */ |
757 | key.objectid = inode->i_ino; | |
758 | key.offset = (u64)-1; | |
5f39d397 CM |
759 | key.type = (u8)-1; |
760 | ||
85e21bac CM |
761 | btrfs_init_path(path); |
762 | search_again: | |
763 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
764 | if (ret < 0) { | |
765 | goto error; | |
766 | } | |
767 | if (ret > 0) { | |
768 | BUG_ON(path->slots[0] == 0); | |
769 | path->slots[0]--; | |
770 | } | |
771 | ||
39279cc3 | 772 | while(1) { |
39279cc3 | 773 | fi = NULL; |
5f39d397 CM |
774 | leaf = path->nodes[0]; |
775 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
776 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 777 | |
5f39d397 | 778 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 779 | break; |
5f39d397 | 780 | |
85e21bac | 781 | if (found_type < min_type) |
39279cc3 CM |
782 | break; |
783 | ||
5f39d397 | 784 | item_end = found_key.offset; |
39279cc3 | 785 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 786 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 787 | struct btrfs_file_extent_item); |
179e29e4 CM |
788 | extent_type = btrfs_file_extent_type(leaf, fi); |
789 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 790 | item_end += |
db94535d | 791 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
792 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
793 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
794 | path->slots[0]); | |
795 | item_end += btrfs_file_extent_inline_len(leaf, | |
796 | item); | |
39279cc3 | 797 | } |
008630c1 | 798 | item_end--; |
39279cc3 CM |
799 | } |
800 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
801 | ret = btrfs_csum_truncate(trans, root, path, | |
802 | inode->i_size); | |
803 | BUG_ON(ret); | |
804 | } | |
008630c1 | 805 | if (item_end < inode->i_size) { |
b888db2b CM |
806 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
807 | found_type = BTRFS_INODE_ITEM_KEY; | |
808 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
809 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
810 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
811 | found_type = BTRFS_XATTR_ITEM_KEY; | |
812 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
813 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
814 | } else if (found_type) { |
815 | found_type--; | |
816 | } else { | |
817 | break; | |
39279cc3 | 818 | } |
a61721d5 | 819 | btrfs_set_key_type(&key, found_type); |
85e21bac | 820 | goto next; |
39279cc3 | 821 | } |
5f39d397 | 822 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
823 | del_item = 1; |
824 | else | |
825 | del_item = 0; | |
826 | found_extent = 0; | |
827 | ||
828 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
829 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
830 | goto delete; | |
831 | ||
832 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 833 | u64 num_dec; |
db94535d | 834 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 835 | if (!del_item) { |
db94535d CM |
836 | u64 orig_num_bytes = |
837 | btrfs_file_extent_num_bytes(leaf, fi); | |
838 | extent_num_bytes = inode->i_size - | |
5f39d397 | 839 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
840 | extent_num_bytes = extent_num_bytes & |
841 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
842 | btrfs_set_file_extent_num_bytes(leaf, fi, |
843 | extent_num_bytes); | |
844 | num_dec = (orig_num_bytes - | |
9069218d CM |
845 | extent_num_bytes); |
846 | if (extent_start != 0) | |
847 | dec_i_blocks(inode, num_dec); | |
5f39d397 | 848 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 849 | } else { |
db94535d CM |
850 | extent_num_bytes = |
851 | btrfs_file_extent_disk_num_bytes(leaf, | |
852 | fi); | |
39279cc3 | 853 | /* FIXME blocksize != 4096 */ |
9069218d | 854 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
855 | if (extent_start != 0) { |
856 | found_extent = 1; | |
9069218d | 857 | dec_i_blocks(inode, num_dec); |
39279cc3 | 858 | } |
d8d5f3e1 CM |
859 | root_gen = btrfs_header_generation(leaf); |
860 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 861 | } |
9069218d CM |
862 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
863 | if (!del_item) { | |
864 | u32 newsize = inode->i_size - found_key.offset; | |
865 | dec_i_blocks(inode, item_end + 1 - | |
866 | found_key.offset - newsize); | |
867 | newsize = | |
868 | btrfs_file_extent_calc_inline_size(newsize); | |
869 | ret = btrfs_truncate_item(trans, root, path, | |
870 | newsize, 1); | |
871 | BUG_ON(ret); | |
872 | } else { | |
873 | dec_i_blocks(inode, item_end + 1 - | |
874 | found_key.offset); | |
875 | } | |
39279cc3 | 876 | } |
179e29e4 | 877 | delete: |
39279cc3 | 878 | if (del_item) { |
85e21bac CM |
879 | if (!pending_del_nr) { |
880 | /* no pending yet, add ourselves */ | |
881 | pending_del_slot = path->slots[0]; | |
882 | pending_del_nr = 1; | |
883 | } else if (pending_del_nr && | |
884 | path->slots[0] + 1 == pending_del_slot) { | |
885 | /* hop on the pending chunk */ | |
886 | pending_del_nr++; | |
887 | pending_del_slot = path->slots[0]; | |
888 | } else { | |
889 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
890 | } | |
39279cc3 CM |
891 | } else { |
892 | break; | |
893 | } | |
39279cc3 CM |
894 | if (found_extent) { |
895 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 896 | extent_num_bytes, |
d8d5f3e1 | 897 | root_owner, |
7bb86316 CM |
898 | root_gen, inode->i_ino, |
899 | found_key.offset, 0); | |
39279cc3 CM |
900 | BUG_ON(ret); |
901 | } | |
85e21bac CM |
902 | next: |
903 | if (path->slots[0] == 0) { | |
904 | if (pending_del_nr) | |
905 | goto del_pending; | |
906 | btrfs_release_path(root, path); | |
907 | goto search_again; | |
908 | } | |
909 | ||
910 | path->slots[0]--; | |
911 | if (pending_del_nr && | |
912 | path->slots[0] + 1 != pending_del_slot) { | |
913 | struct btrfs_key debug; | |
914 | del_pending: | |
915 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
916 | pending_del_slot); | |
917 | ret = btrfs_del_items(trans, root, path, | |
918 | pending_del_slot, | |
919 | pending_del_nr); | |
920 | BUG_ON(ret); | |
921 | pending_del_nr = 0; | |
922 | btrfs_release_path(root, path); | |
923 | goto search_again; | |
924 | } | |
39279cc3 CM |
925 | } |
926 | ret = 0; | |
927 | error: | |
85e21bac CM |
928 | if (pending_del_nr) { |
929 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
930 | pending_del_nr); | |
931 | } | |
39279cc3 CM |
932 | btrfs_release_path(root, path); |
933 | btrfs_free_path(path); | |
934 | inode->i_sb->s_dirt = 1; | |
935 | return ret; | |
936 | } | |
937 | ||
b888db2b | 938 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
939 | size_t zero_start) |
940 | { | |
941 | char *kaddr; | |
d1310b2e | 942 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
35ebb934 | 943 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 944 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 | 945 | int ret = 0; |
a52d9a80 | 946 | |
190662b2 | 947 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 948 | set_page_extent_mapped(page); |
a52d9a80 | 949 | |
d1310b2e | 950 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 951 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, |
b888db2b | 952 | page_end, GFP_NOFS); |
1832a6d5 | 953 | |
a52d9a80 | 954 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 955 | kaddr = kmap(page); |
a52d9a80 CM |
956 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
957 | flush_dcache_page(page); | |
b888db2b | 958 | kunmap(page); |
a52d9a80 | 959 | } |
b888db2b | 960 | set_page_dirty(page); |
d1310b2e | 961 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
a52d9a80 | 962 | |
a52d9a80 CM |
963 | return ret; |
964 | } | |
965 | ||
39279cc3 CM |
966 | /* |
967 | * taken from block_truncate_page, but does cow as it zeros out | |
968 | * any bytes left in the last page in the file. | |
969 | */ | |
970 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
971 | { | |
972 | struct inode *inode = mapping->host; | |
db94535d CM |
973 | struct btrfs_root *root = BTRFS_I(inode)->root; |
974 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
975 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
976 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
977 | struct page *page; | |
39279cc3 | 978 | int ret = 0; |
a52d9a80 | 979 | u64 page_start; |
39279cc3 CM |
980 | |
981 | if ((offset & (blocksize - 1)) == 0) | |
982 | goto out; | |
983 | ||
984 | ret = -ENOMEM; | |
985 | page = grab_cache_page(mapping, index); | |
986 | if (!page) | |
987 | goto out; | |
39279cc3 | 988 | if (!PageUptodate(page)) { |
9ebefb18 | 989 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
990 | lock_page(page); |
991 | if (!PageUptodate(page)) { | |
992 | ret = -EIO; | |
993 | goto out; | |
994 | } | |
995 | } | |
35ebb934 | 996 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 997 | |
b888db2b | 998 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 999 | |
39279cc3 CM |
1000 | unlock_page(page); |
1001 | page_cache_release(page); | |
1002 | out: | |
1003 | return ret; | |
1004 | } | |
1005 | ||
1006 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1007 | { | |
1008 | struct inode *inode = dentry->d_inode; | |
1009 | int err; | |
1010 | ||
1011 | err = inode_change_ok(inode, attr); | |
1012 | if (err) | |
1013 | return err; | |
1014 | ||
1015 | if (S_ISREG(inode->i_mode) && | |
1016 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1017 | struct btrfs_trans_handle *trans; | |
1018 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1019 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1020 | |
5f39d397 | 1021 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1022 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1023 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1024 | u64 hole_size; |
179e29e4 | 1025 | u64 alloc_hint = 0; |
39279cc3 | 1026 | |
1b0f7c29 | 1027 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1028 | goto out; |
1029 | ||
1832a6d5 CM |
1030 | mutex_lock(&root->fs_info->fs_mutex); |
1031 | err = btrfs_check_free_space(root, 1, 0); | |
1032 | mutex_unlock(&root->fs_info->fs_mutex); | |
1033 | if (err) | |
1034 | goto fail; | |
1035 | ||
39279cc3 CM |
1036 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1037 | ||
1b0f7c29 | 1038 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
5f56406a | 1039 | hole_size = block_end - hole_start; |
39279cc3 CM |
1040 | |
1041 | mutex_lock(&root->fs_info->fs_mutex); | |
1042 | trans = btrfs_start_transaction(root, 1); | |
1043 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 1044 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1045 | hole_start, block_end, hole_start, |
3326d1b0 | 1046 | &alloc_hint); |
2bf5a725 | 1047 | |
179e29e4 CM |
1048 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1049 | err = btrfs_insert_file_extent(trans, root, | |
1050 | inode->i_ino, | |
5f56406a CM |
1051 | hole_start, 0, 0, |
1052 | hole_size); | |
d1310b2e CM |
1053 | btrfs_drop_extent_cache(inode, hole_start, |
1054 | hole_size - 1); | |
5f56406a | 1055 | btrfs_check_file(root, inode); |
179e29e4 | 1056 | } |
39279cc3 CM |
1057 | btrfs_end_transaction(trans, root); |
1058 | mutex_unlock(&root->fs_info->fs_mutex); | |
1b0f7c29 | 1059 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1060 | if (err) |
1061 | return err; | |
39279cc3 CM |
1062 | } |
1063 | out: | |
1064 | err = inode_setattr(inode, attr); | |
1832a6d5 | 1065 | fail: |
39279cc3 CM |
1066 | return err; |
1067 | } | |
61295eb8 | 1068 | |
2da98f00 | 1069 | void btrfs_put_inode(struct inode *inode) |
61295eb8 | 1070 | { |
2da98f00 CM |
1071 | int ret; |
1072 | ||
1073 | if (!BTRFS_I(inode)->ordered_trans) { | |
61295eb8 CM |
1074 | return; |
1075 | } | |
2da98f00 CM |
1076 | |
1077 | if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) || | |
1078 | mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) | |
1079 | return; | |
1080 | ||
1081 | ret = btrfs_del_ordered_inode(inode); | |
1082 | if (ret == 1) { | |
1083 | atomic_dec(&inode->i_count); | |
1084 | } | |
61295eb8 CM |
1085 | } |
1086 | ||
39279cc3 CM |
1087 | void btrfs_delete_inode(struct inode *inode) |
1088 | { | |
1089 | struct btrfs_trans_handle *trans; | |
1090 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1091 | unsigned long nr; |
39279cc3 CM |
1092 | int ret; |
1093 | ||
1094 | truncate_inode_pages(&inode->i_data, 0); | |
1095 | if (is_bad_inode(inode)) { | |
1096 | goto no_delete; | |
1097 | } | |
5f39d397 | 1098 | |
39279cc3 CM |
1099 | inode->i_size = 0; |
1100 | mutex_lock(&root->fs_info->fs_mutex); | |
1101 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1102 | |
39279cc3 | 1103 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1104 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
54aa1f4d CM |
1105 | if (ret) |
1106 | goto no_delete_lock; | |
85e21bac | 1107 | |
d3c2fdcf | 1108 | nr = trans->blocks_used; |
85e21bac | 1109 | clear_inode(inode); |
5f39d397 | 1110 | |
39279cc3 CM |
1111 | btrfs_end_transaction(trans, root); |
1112 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1113 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1114 | btrfs_throttle(root); |
39279cc3 | 1115 | return; |
54aa1f4d CM |
1116 | |
1117 | no_delete_lock: | |
d3c2fdcf | 1118 | nr = trans->blocks_used; |
54aa1f4d CM |
1119 | btrfs_end_transaction(trans, root); |
1120 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1121 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1122 | btrfs_throttle(root); |
39279cc3 CM |
1123 | no_delete: |
1124 | clear_inode(inode); | |
1125 | } | |
1126 | ||
1127 | /* | |
1128 | * this returns the key found in the dir entry in the location pointer. | |
1129 | * If no dir entries were found, location->objectid is 0. | |
1130 | */ | |
1131 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1132 | struct btrfs_key *location) | |
1133 | { | |
1134 | const char *name = dentry->d_name.name; | |
1135 | int namelen = dentry->d_name.len; | |
1136 | struct btrfs_dir_item *di; | |
1137 | struct btrfs_path *path; | |
1138 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1139 | int ret = 0; |
39279cc3 | 1140 | |
3954401f CM |
1141 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1142 | location->objectid = dir->i_ino; | |
1143 | location->type = BTRFS_INODE_ITEM_KEY; | |
1144 | location->offset = 0; | |
1145 | return 0; | |
1146 | } | |
39279cc3 CM |
1147 | path = btrfs_alloc_path(); |
1148 | BUG_ON(!path); | |
3954401f | 1149 | |
7a720536 | 1150 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1151 | struct btrfs_key key; |
1152 | struct extent_buffer *leaf; | |
1153 | u32 nritems; | |
1154 | int slot; | |
1155 | ||
1156 | key.objectid = dir->i_ino; | |
1157 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1158 | key.offset = 0; | |
1159 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1160 | BUG_ON(ret == 0); | |
1161 | ret = 0; | |
1162 | ||
1163 | leaf = path->nodes[0]; | |
1164 | slot = path->slots[0]; | |
1165 | nritems = btrfs_header_nritems(leaf); | |
1166 | if (slot >= nritems) | |
1167 | goto out_err; | |
1168 | ||
1169 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1170 | if (key.objectid != dir->i_ino || | |
1171 | key.type != BTRFS_INODE_REF_KEY) { | |
1172 | goto out_err; | |
1173 | } | |
1174 | location->objectid = key.offset; | |
1175 | location->type = BTRFS_INODE_ITEM_KEY; | |
1176 | location->offset = 0; | |
1177 | goto out; | |
1178 | } | |
1179 | ||
39279cc3 CM |
1180 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1181 | namelen, 0); | |
0d9f7f3e Y |
1182 | if (IS_ERR(di)) |
1183 | ret = PTR_ERR(di); | |
39279cc3 | 1184 | if (!di || IS_ERR(di)) { |
3954401f | 1185 | goto out_err; |
39279cc3 | 1186 | } |
5f39d397 | 1187 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1188 | out: |
39279cc3 CM |
1189 | btrfs_free_path(path); |
1190 | return ret; | |
3954401f CM |
1191 | out_err: |
1192 | location->objectid = 0; | |
1193 | goto out; | |
39279cc3 CM |
1194 | } |
1195 | ||
1196 | /* | |
1197 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1198 | * needs to be changed to reflect the root directory of the tree root. This | |
1199 | * is kind of like crossing a mount point. | |
1200 | */ | |
1201 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1202 | struct btrfs_key *location, | |
58176a96 JB |
1203 | struct btrfs_root **sub_root, |
1204 | struct dentry *dentry) | |
39279cc3 CM |
1205 | { |
1206 | struct btrfs_path *path; | |
1207 | struct btrfs_root_item *ri; | |
1208 | ||
1209 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1210 | return 0; | |
1211 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1212 | return 0; | |
1213 | ||
1214 | path = btrfs_alloc_path(); | |
1215 | BUG_ON(!path); | |
1216 | mutex_lock(&root->fs_info->fs_mutex); | |
1217 | ||
58176a96 JB |
1218 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1219 | dentry->d_name.name, | |
1220 | dentry->d_name.len); | |
39279cc3 CM |
1221 | if (IS_ERR(*sub_root)) |
1222 | return PTR_ERR(*sub_root); | |
1223 | ||
1224 | ri = &(*sub_root)->root_item; | |
1225 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1226 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1227 | location->offset = 0; | |
1228 | ||
1229 | btrfs_free_path(path); | |
1230 | mutex_unlock(&root->fs_info->fs_mutex); | |
1231 | return 0; | |
1232 | } | |
1233 | ||
1234 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1235 | { | |
1236 | struct btrfs_iget_args *args = p; | |
1237 | inode->i_ino = args->ino; | |
1238 | BTRFS_I(inode)->root = args->root; | |
9069218d | 1239 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e CM |
1240 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1241 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1242 | inode->i_mapping, GFP_NOFS); |
39279cc3 CM |
1243 | return 0; |
1244 | } | |
1245 | ||
1246 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1247 | { | |
1248 | struct btrfs_iget_args *args = opaque; | |
1249 | return (args->ino == inode->i_ino && | |
1250 | args->root == BTRFS_I(inode)->root); | |
1251 | } | |
1252 | ||
dc17ff8f CM |
1253 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1254 | u64 root_objectid) | |
1255 | { | |
1256 | struct btrfs_iget_args args; | |
1257 | args.ino = objectid; | |
1258 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1259 | ||
1260 | if (!args.root) | |
1261 | return NULL; | |
1262 | ||
1263 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1264 | } | |
1265 | ||
39279cc3 CM |
1266 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1267 | struct btrfs_root *root) | |
1268 | { | |
1269 | struct inode *inode; | |
1270 | struct btrfs_iget_args args; | |
1271 | args.ino = objectid; | |
1272 | args.root = root; | |
1273 | ||
1274 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1275 | btrfs_init_locked_inode, | |
1276 | (void *)&args); | |
1277 | return inode; | |
1278 | } | |
1279 | ||
1280 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1281 | struct nameidata *nd) | |
1282 | { | |
1283 | struct inode * inode; | |
1284 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1285 | struct btrfs_root *root = bi->root; | |
1286 | struct btrfs_root *sub_root = root; | |
1287 | struct btrfs_key location; | |
1288 | int ret; | |
1289 | ||
1290 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1291 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1292 | |
39279cc3 CM |
1293 | mutex_lock(&root->fs_info->fs_mutex); |
1294 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1295 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1296 | |
39279cc3 CM |
1297 | if (ret < 0) |
1298 | return ERR_PTR(ret); | |
5f39d397 | 1299 | |
39279cc3 CM |
1300 | inode = NULL; |
1301 | if (location.objectid) { | |
58176a96 JB |
1302 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1303 | dentry); | |
39279cc3 CM |
1304 | if (ret < 0) |
1305 | return ERR_PTR(ret); | |
1306 | if (ret > 0) | |
1307 | return ERR_PTR(-ENOENT); | |
1308 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1309 | sub_root); | |
1310 | if (!inode) | |
1311 | return ERR_PTR(-EACCES); | |
1312 | if (inode->i_state & I_NEW) { | |
1313 | /* the inode and parent dir are two different roots */ | |
1314 | if (sub_root != root) { | |
1315 | igrab(inode); | |
1316 | sub_root->inode = inode; | |
1317 | } | |
1318 | BTRFS_I(inode)->root = sub_root; | |
1319 | memcpy(&BTRFS_I(inode)->location, &location, | |
1320 | sizeof(location)); | |
1321 | btrfs_read_locked_inode(inode); | |
1322 | unlock_new_inode(inode); | |
1323 | } | |
1324 | } | |
1325 | return d_splice_alias(inode, dentry); | |
1326 | } | |
1327 | ||
39279cc3 CM |
1328 | static unsigned char btrfs_filetype_table[] = { |
1329 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1330 | }; | |
1331 | ||
1332 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1333 | { | |
6da6abae | 1334 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1335 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1336 | struct btrfs_item *item; | |
1337 | struct btrfs_dir_item *di; | |
1338 | struct btrfs_key key; | |
5f39d397 | 1339 | struct btrfs_key found_key; |
39279cc3 CM |
1340 | struct btrfs_path *path; |
1341 | int ret; | |
1342 | u32 nritems; | |
5f39d397 | 1343 | struct extent_buffer *leaf; |
39279cc3 CM |
1344 | int slot; |
1345 | int advance; | |
1346 | unsigned char d_type; | |
1347 | int over = 0; | |
1348 | u32 di_cur; | |
1349 | u32 di_total; | |
1350 | u32 di_len; | |
1351 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1352 | char tmp_name[32]; |
1353 | char *name_ptr; | |
1354 | int name_len; | |
39279cc3 CM |
1355 | |
1356 | /* FIXME, use a real flag for deciding about the key type */ | |
1357 | if (root->fs_info->tree_root == root) | |
1358 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1359 | |
3954401f CM |
1360 | /* special case for "." */ |
1361 | if (filp->f_pos == 0) { | |
1362 | over = filldir(dirent, ".", 1, | |
1363 | 1, inode->i_ino, | |
1364 | DT_DIR); | |
1365 | if (over) | |
1366 | return 0; | |
1367 | filp->f_pos = 1; | |
1368 | } | |
1369 | ||
39279cc3 CM |
1370 | mutex_lock(&root->fs_info->fs_mutex); |
1371 | key.objectid = inode->i_ino; | |
3954401f CM |
1372 | path = btrfs_alloc_path(); |
1373 | path->reada = 2; | |
1374 | ||
1375 | /* special case for .., just use the back ref */ | |
1376 | if (filp->f_pos == 1) { | |
1377 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1378 | key.offset = 0; | |
1379 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1380 | BUG_ON(ret == 0); | |
1381 | leaf = path->nodes[0]; | |
1382 | slot = path->slots[0]; | |
1383 | nritems = btrfs_header_nritems(leaf); | |
1384 | if (slot >= nritems) { | |
1385 | btrfs_release_path(root, path); | |
1386 | goto read_dir_items; | |
1387 | } | |
1388 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1389 | btrfs_release_path(root, path); | |
1390 | if (found_key.objectid != key.objectid || | |
1391 | found_key.type != BTRFS_INODE_REF_KEY) | |
1392 | goto read_dir_items; | |
1393 | over = filldir(dirent, "..", 2, | |
1394 | 2, found_key.offset, DT_DIR); | |
1395 | if (over) | |
1396 | goto nopos; | |
1397 | filp->f_pos = 2; | |
1398 | } | |
1399 | ||
1400 | read_dir_items: | |
39279cc3 CM |
1401 | btrfs_set_key_type(&key, key_type); |
1402 | key.offset = filp->f_pos; | |
5f39d397 | 1403 | |
39279cc3 CM |
1404 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1405 | if (ret < 0) | |
1406 | goto err; | |
1407 | advance = 0; | |
39279cc3 | 1408 | while(1) { |
5f39d397 CM |
1409 | leaf = path->nodes[0]; |
1410 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1411 | slot = path->slots[0]; |
1412 | if (advance || slot >= nritems) { | |
1413 | if (slot >= nritems -1) { | |
39279cc3 CM |
1414 | ret = btrfs_next_leaf(root, path); |
1415 | if (ret) | |
1416 | break; | |
5f39d397 CM |
1417 | leaf = path->nodes[0]; |
1418 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1419 | slot = path->slots[0]; |
1420 | } else { | |
1421 | slot++; | |
1422 | path->slots[0]++; | |
1423 | } | |
1424 | } | |
1425 | advance = 1; | |
5f39d397 CM |
1426 | item = btrfs_item_nr(leaf, slot); |
1427 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1428 | ||
1429 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1430 | break; |
5f39d397 | 1431 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1432 | break; |
5f39d397 | 1433 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1434 | continue; |
5f39d397 CM |
1435 | |
1436 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1437 | advance = 1; |
1438 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1439 | di_cur = 0; | |
5f39d397 | 1440 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1441 | while(di_cur < di_total) { |
5f39d397 CM |
1442 | struct btrfs_key location; |
1443 | ||
1444 | name_len = btrfs_dir_name_len(leaf, di); | |
1445 | if (name_len < 32) { | |
1446 | name_ptr = tmp_name; | |
1447 | } else { | |
1448 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1449 | BUG_ON(!name_ptr); | |
1450 | } | |
1451 | read_extent_buffer(leaf, name_ptr, | |
1452 | (unsigned long)(di + 1), name_len); | |
1453 | ||
1454 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1455 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1456 | over = filldir(dirent, name_ptr, name_len, |
1457 | found_key.offset, | |
1458 | location.objectid, | |
39279cc3 | 1459 | d_type); |
5f39d397 CM |
1460 | |
1461 | if (name_ptr != tmp_name) | |
1462 | kfree(name_ptr); | |
1463 | ||
39279cc3 CM |
1464 | if (over) |
1465 | goto nopos; | |
5103e947 JB |
1466 | di_len = btrfs_dir_name_len(leaf, di) + |
1467 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1468 | di_cur += di_len; |
1469 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1470 | } | |
1471 | } | |
5e591a07 YZ |
1472 | if (key_type == BTRFS_DIR_INDEX_KEY) |
1473 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
1474 | else | |
1475 | filp->f_pos++; | |
39279cc3 CM |
1476 | nopos: |
1477 | ret = 0; | |
1478 | err: | |
1479 | btrfs_release_path(root, path); | |
1480 | btrfs_free_path(path); | |
1481 | mutex_unlock(&root->fs_info->fs_mutex); | |
1482 | return ret; | |
1483 | } | |
1484 | ||
1485 | int btrfs_write_inode(struct inode *inode, int wait) | |
1486 | { | |
1487 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1488 | struct btrfs_trans_handle *trans; | |
1489 | int ret = 0; | |
1490 | ||
1491 | if (wait) { | |
1492 | mutex_lock(&root->fs_info->fs_mutex); | |
1493 | trans = btrfs_start_transaction(root, 1); | |
1494 | btrfs_set_trans_block_group(trans, inode); | |
1495 | ret = btrfs_commit_transaction(trans, root); | |
1496 | mutex_unlock(&root->fs_info->fs_mutex); | |
1497 | } | |
1498 | return ret; | |
1499 | } | |
1500 | ||
1501 | /* | |
54aa1f4d | 1502 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1503 | * inode changes. But, it is most likely to find the inode in cache. |
1504 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1505 | * to keep or drop this code. | |
1506 | */ | |
1507 | void btrfs_dirty_inode(struct inode *inode) | |
1508 | { | |
1509 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1510 | struct btrfs_trans_handle *trans; | |
1511 | ||
1512 | mutex_lock(&root->fs_info->fs_mutex); | |
1513 | trans = btrfs_start_transaction(root, 1); | |
1514 | btrfs_set_trans_block_group(trans, inode); | |
1515 | btrfs_update_inode(trans, root, inode); | |
1516 | btrfs_end_transaction(trans, root); | |
1517 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1518 | } |
1519 | ||
1520 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1521 | struct btrfs_root *root, | |
9c58309d CM |
1522 | const char *name, int name_len, |
1523 | u64 ref_objectid, | |
39279cc3 CM |
1524 | u64 objectid, |
1525 | struct btrfs_block_group_cache *group, | |
1526 | int mode) | |
1527 | { | |
1528 | struct inode *inode; | |
5f39d397 | 1529 | struct btrfs_inode_item *inode_item; |
6324fbf3 | 1530 | struct btrfs_block_group_cache *new_inode_group; |
39279cc3 | 1531 | struct btrfs_key *location; |
5f39d397 | 1532 | struct btrfs_path *path; |
9c58309d CM |
1533 | struct btrfs_inode_ref *ref; |
1534 | struct btrfs_key key[2]; | |
1535 | u32 sizes[2]; | |
1536 | unsigned long ptr; | |
39279cc3 CM |
1537 | int ret; |
1538 | int owner; | |
1539 | ||
5f39d397 CM |
1540 | path = btrfs_alloc_path(); |
1541 | BUG_ON(!path); | |
1542 | ||
39279cc3 CM |
1543 | inode = new_inode(root->fs_info->sb); |
1544 | if (!inode) | |
1545 | return ERR_PTR(-ENOMEM); | |
1546 | ||
d1310b2e CM |
1547 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1548 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1549 | inode->i_mapping, GFP_NOFS); |
9069218d | 1550 | BTRFS_I(inode)->delalloc_bytes = 0; |
39279cc3 | 1551 | BTRFS_I(inode)->root = root; |
b888db2b | 1552 | |
39279cc3 CM |
1553 | if (mode & S_IFDIR) |
1554 | owner = 0; | |
1555 | else | |
1556 | owner = 1; | |
6324fbf3 | 1557 | new_inode_group = btrfs_find_block_group(root, group, 0, |
0b86a832 | 1558 | BTRFS_BLOCK_GROUP_METADATA, owner); |
6324fbf3 CM |
1559 | if (!new_inode_group) { |
1560 | printk("find_block group failed\n"); | |
1561 | new_inode_group = group; | |
1562 | } | |
1563 | BTRFS_I(inode)->block_group = new_inode_group; | |
b98b6767 | 1564 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
1565 | |
1566 | key[0].objectid = objectid; | |
1567 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
1568 | key[0].offset = 0; | |
1569 | ||
1570 | key[1].objectid = objectid; | |
1571 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
1572 | key[1].offset = ref_objectid; | |
1573 | ||
1574 | sizes[0] = sizeof(struct btrfs_inode_item); | |
1575 | sizes[1] = name_len + sizeof(*ref); | |
1576 | ||
1577 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
1578 | if (ret != 0) | |
5f39d397 CM |
1579 | goto fail; |
1580 | ||
9c58309d CM |
1581 | if (objectid > root->highest_inode) |
1582 | root->highest_inode = objectid; | |
1583 | ||
39279cc3 CM |
1584 | inode->i_uid = current->fsuid; |
1585 | inode->i_gid = current->fsgid; | |
1586 | inode->i_mode = mode; | |
1587 | inode->i_ino = objectid; | |
1588 | inode->i_blocks = 0; | |
1589 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1590 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1591 | struct btrfs_inode_item); | |
1592 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
1593 | |
1594 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
1595 | struct btrfs_inode_ref); | |
1596 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
1597 | ptr = (unsigned long)(ref + 1); | |
1598 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
1599 | ||
5f39d397 CM |
1600 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1601 | btrfs_free_path(path); | |
1602 | ||
39279cc3 CM |
1603 | location = &BTRFS_I(inode)->location; |
1604 | location->objectid = objectid; | |
39279cc3 CM |
1605 | location->offset = 0; |
1606 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1607 | ||
39279cc3 CM |
1608 | insert_inode_hash(inode); |
1609 | return inode; | |
5f39d397 CM |
1610 | fail: |
1611 | btrfs_free_path(path); | |
1612 | return ERR_PTR(ret); | |
39279cc3 CM |
1613 | } |
1614 | ||
1615 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1616 | { | |
1617 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1618 | } | |
1619 | ||
1620 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1621 | struct dentry *dentry, struct inode *inode, |
1622 | int add_backref) | |
39279cc3 CM |
1623 | { |
1624 | int ret; | |
1625 | struct btrfs_key key; | |
1626 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1627 | struct inode *parent_inode; |
5f39d397 | 1628 | |
39279cc3 | 1629 | key.objectid = inode->i_ino; |
39279cc3 CM |
1630 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1631 | key.offset = 0; | |
1632 | ||
1633 | ret = btrfs_insert_dir_item(trans, root, | |
1634 | dentry->d_name.name, dentry->d_name.len, | |
1635 | dentry->d_parent->d_inode->i_ino, | |
1636 | &key, btrfs_inode_type(inode)); | |
1637 | if (ret == 0) { | |
9c58309d CM |
1638 | if (add_backref) { |
1639 | ret = btrfs_insert_inode_ref(trans, root, | |
1640 | dentry->d_name.name, | |
1641 | dentry->d_name.len, | |
1642 | inode->i_ino, | |
1643 | dentry->d_parent->d_inode->i_ino); | |
1644 | } | |
79c44584 CM |
1645 | parent_inode = dentry->d_parent->d_inode; |
1646 | parent_inode->i_size += dentry->d_name.len * 2; | |
1647 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1648 | ret = btrfs_update_inode(trans, root, |
1649 | dentry->d_parent->d_inode); | |
1650 | } | |
1651 | return ret; | |
1652 | } | |
1653 | ||
1654 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1655 | struct dentry *dentry, struct inode *inode, |
1656 | int backref) | |
39279cc3 | 1657 | { |
9c58309d | 1658 | int err = btrfs_add_link(trans, dentry, inode, backref); |
39279cc3 CM |
1659 | if (!err) { |
1660 | d_instantiate(dentry, inode); | |
1661 | return 0; | |
1662 | } | |
1663 | if (err > 0) | |
1664 | err = -EEXIST; | |
1665 | return err; | |
1666 | } | |
1667 | ||
618e21d5 JB |
1668 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1669 | int mode, dev_t rdev) | |
1670 | { | |
1671 | struct btrfs_trans_handle *trans; | |
1672 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1673 | struct inode *inode = NULL; |
618e21d5 JB |
1674 | int err; |
1675 | int drop_inode = 0; | |
1676 | u64 objectid; | |
1832a6d5 | 1677 | unsigned long nr = 0; |
618e21d5 JB |
1678 | |
1679 | if (!new_valid_dev(rdev)) | |
1680 | return -EINVAL; | |
1681 | ||
1682 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1683 | err = btrfs_check_free_space(root, 1, 0); |
1684 | if (err) | |
1685 | goto fail; | |
1686 | ||
618e21d5 JB |
1687 | trans = btrfs_start_transaction(root, 1); |
1688 | btrfs_set_trans_block_group(trans, dir); | |
1689 | ||
1690 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1691 | if (err) { | |
1692 | err = -ENOSPC; | |
1693 | goto out_unlock; | |
1694 | } | |
1695 | ||
9c58309d CM |
1696 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1697 | dentry->d_name.len, | |
1698 | dentry->d_parent->d_inode->i_ino, objectid, | |
618e21d5 JB |
1699 | BTRFS_I(dir)->block_group, mode); |
1700 | err = PTR_ERR(inode); | |
1701 | if (IS_ERR(inode)) | |
1702 | goto out_unlock; | |
1703 | ||
1704 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1705 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
618e21d5 JB |
1706 | if (err) |
1707 | drop_inode = 1; | |
1708 | else { | |
1709 | inode->i_op = &btrfs_special_inode_operations; | |
1710 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1711 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1712 | } |
1713 | dir->i_sb->s_dirt = 1; | |
1714 | btrfs_update_inode_block_group(trans, inode); | |
1715 | btrfs_update_inode_block_group(trans, dir); | |
1716 | out_unlock: | |
d3c2fdcf | 1717 | nr = trans->blocks_used; |
618e21d5 | 1718 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1719 | fail: |
618e21d5 JB |
1720 | mutex_unlock(&root->fs_info->fs_mutex); |
1721 | ||
1722 | if (drop_inode) { | |
1723 | inode_dec_link_count(inode); | |
1724 | iput(inode); | |
1725 | } | |
d3c2fdcf | 1726 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1727 | btrfs_throttle(root); |
618e21d5 JB |
1728 | return err; |
1729 | } | |
1730 | ||
39279cc3 CM |
1731 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1732 | int mode, struct nameidata *nd) | |
1733 | { | |
1734 | struct btrfs_trans_handle *trans; | |
1735 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1736 | struct inode *inode = NULL; |
39279cc3 CM |
1737 | int err; |
1738 | int drop_inode = 0; | |
1832a6d5 | 1739 | unsigned long nr = 0; |
39279cc3 CM |
1740 | u64 objectid; |
1741 | ||
1742 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1743 | err = btrfs_check_free_space(root, 1, 0); |
1744 | if (err) | |
1745 | goto fail; | |
39279cc3 CM |
1746 | trans = btrfs_start_transaction(root, 1); |
1747 | btrfs_set_trans_block_group(trans, dir); | |
1748 | ||
1749 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1750 | if (err) { | |
1751 | err = -ENOSPC; | |
1752 | goto out_unlock; | |
1753 | } | |
1754 | ||
9c58309d CM |
1755 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1756 | dentry->d_name.len, | |
1757 | dentry->d_parent->d_inode->i_ino, | |
1758 | objectid, BTRFS_I(dir)->block_group, mode); | |
39279cc3 CM |
1759 | err = PTR_ERR(inode); |
1760 | if (IS_ERR(inode)) | |
1761 | goto out_unlock; | |
1762 | ||
1763 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1764 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
1765 | if (err) |
1766 | drop_inode = 1; | |
1767 | else { | |
1768 | inode->i_mapping->a_ops = &btrfs_aops; | |
1769 | inode->i_fop = &btrfs_file_operations; | |
1770 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
1771 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1772 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 1773 | inode->i_mapping, GFP_NOFS); |
9069218d | 1774 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e | 1775 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1776 | } |
1777 | dir->i_sb->s_dirt = 1; | |
1778 | btrfs_update_inode_block_group(trans, inode); | |
1779 | btrfs_update_inode_block_group(trans, dir); | |
1780 | out_unlock: | |
d3c2fdcf | 1781 | nr = trans->blocks_used; |
39279cc3 | 1782 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1783 | fail: |
39279cc3 CM |
1784 | mutex_unlock(&root->fs_info->fs_mutex); |
1785 | ||
1786 | if (drop_inode) { | |
1787 | inode_dec_link_count(inode); | |
1788 | iput(inode); | |
1789 | } | |
d3c2fdcf | 1790 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1791 | btrfs_throttle(root); |
39279cc3 CM |
1792 | return err; |
1793 | } | |
1794 | ||
1795 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1796 | struct dentry *dentry) | |
1797 | { | |
1798 | struct btrfs_trans_handle *trans; | |
1799 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1800 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1801 | unsigned long nr = 0; |
39279cc3 CM |
1802 | int err; |
1803 | int drop_inode = 0; | |
1804 | ||
1805 | if (inode->i_nlink == 0) | |
1806 | return -ENOENT; | |
1807 | ||
6da6abae CM |
1808 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1809 | inode->i_nlink++; | |
1810 | #else | |
39279cc3 | 1811 | inc_nlink(inode); |
6da6abae | 1812 | #endif |
39279cc3 | 1813 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1814 | err = btrfs_check_free_space(root, 1, 0); |
1815 | if (err) | |
1816 | goto fail; | |
39279cc3 | 1817 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1818 | |
39279cc3 CM |
1819 | btrfs_set_trans_block_group(trans, dir); |
1820 | atomic_inc(&inode->i_count); | |
9c58309d | 1821 | err = btrfs_add_nondir(trans, dentry, inode, 1); |
5f39d397 | 1822 | |
39279cc3 CM |
1823 | if (err) |
1824 | drop_inode = 1; | |
5f39d397 | 1825 | |
39279cc3 CM |
1826 | dir->i_sb->s_dirt = 1; |
1827 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1828 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1829 | |
54aa1f4d CM |
1830 | if (err) |
1831 | drop_inode = 1; | |
39279cc3 | 1832 | |
d3c2fdcf | 1833 | nr = trans->blocks_used; |
39279cc3 | 1834 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1835 | fail: |
39279cc3 CM |
1836 | mutex_unlock(&root->fs_info->fs_mutex); |
1837 | ||
1838 | if (drop_inode) { | |
1839 | inode_dec_link_count(inode); | |
1840 | iput(inode); | |
1841 | } | |
d3c2fdcf | 1842 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1843 | btrfs_throttle(root); |
39279cc3 CM |
1844 | return err; |
1845 | } | |
1846 | ||
39279cc3 CM |
1847 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1848 | { | |
1849 | struct inode *inode; | |
1850 | struct btrfs_trans_handle *trans; | |
1851 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1852 | int err = 0; | |
1853 | int drop_on_err = 0; | |
1854 | u64 objectid; | |
d3c2fdcf | 1855 | unsigned long nr = 1; |
39279cc3 CM |
1856 | |
1857 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1858 | err = btrfs_check_free_space(root, 1, 0); |
1859 | if (err) | |
1860 | goto out_unlock; | |
1861 | ||
39279cc3 CM |
1862 | trans = btrfs_start_transaction(root, 1); |
1863 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 1864 | |
39279cc3 CM |
1865 | if (IS_ERR(trans)) { |
1866 | err = PTR_ERR(trans); | |
1867 | goto out_unlock; | |
1868 | } | |
1869 | ||
1870 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1871 | if (err) { | |
1872 | err = -ENOSPC; | |
1873 | goto out_unlock; | |
1874 | } | |
1875 | ||
9c58309d CM |
1876 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1877 | dentry->d_name.len, | |
1878 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
1879 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
1880 | if (IS_ERR(inode)) { | |
1881 | err = PTR_ERR(inode); | |
1882 | goto out_fail; | |
1883 | } | |
5f39d397 | 1884 | |
39279cc3 CM |
1885 | drop_on_err = 1; |
1886 | inode->i_op = &btrfs_dir_inode_operations; | |
1887 | inode->i_fop = &btrfs_dir_file_operations; | |
1888 | btrfs_set_trans_block_group(trans, inode); | |
1889 | ||
3954401f | 1890 | inode->i_size = 0; |
39279cc3 CM |
1891 | err = btrfs_update_inode(trans, root, inode); |
1892 | if (err) | |
1893 | goto out_fail; | |
5f39d397 | 1894 | |
9c58309d | 1895 | err = btrfs_add_link(trans, dentry, inode, 0); |
39279cc3 CM |
1896 | if (err) |
1897 | goto out_fail; | |
5f39d397 | 1898 | |
39279cc3 CM |
1899 | d_instantiate(dentry, inode); |
1900 | drop_on_err = 0; | |
1901 | dir->i_sb->s_dirt = 1; | |
1902 | btrfs_update_inode_block_group(trans, inode); | |
1903 | btrfs_update_inode_block_group(trans, dir); | |
1904 | ||
1905 | out_fail: | |
d3c2fdcf | 1906 | nr = trans->blocks_used; |
39279cc3 | 1907 | btrfs_end_transaction(trans, root); |
5f39d397 | 1908 | |
39279cc3 CM |
1909 | out_unlock: |
1910 | mutex_unlock(&root->fs_info->fs_mutex); | |
1911 | if (drop_on_err) | |
1912 | iput(inode); | |
d3c2fdcf | 1913 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1914 | btrfs_throttle(root); |
39279cc3 CM |
1915 | return err; |
1916 | } | |
1917 | ||
a52d9a80 | 1918 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 1919 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
1920 | int create) |
1921 | { | |
1922 | int ret; | |
1923 | int err = 0; | |
db94535d | 1924 | u64 bytenr; |
a52d9a80 CM |
1925 | u64 extent_start = 0; |
1926 | u64 extent_end = 0; | |
1927 | u64 objectid = inode->i_ino; | |
1928 | u32 found_type; | |
a52d9a80 CM |
1929 | struct btrfs_path *path; |
1930 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1931 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
1932 | struct extent_buffer *leaf; |
1933 | struct btrfs_key found_key; | |
a52d9a80 CM |
1934 | struct extent_map *em = NULL; |
1935 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 1936 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
1937 | struct btrfs_trans_handle *trans = NULL; |
1938 | ||
1939 | path = btrfs_alloc_path(); | |
1940 | BUG_ON(!path); | |
1941 | mutex_lock(&root->fs_info->fs_mutex); | |
1942 | ||
1943 | again: | |
d1310b2e CM |
1944 | spin_lock(&em_tree->lock); |
1945 | em = lookup_extent_mapping(em_tree, start, len); | |
1946 | spin_unlock(&em_tree->lock); | |
1947 | ||
a52d9a80 | 1948 | if (em) { |
56b453c9 | 1949 | if (em->start > start) { |
d1310b2e CM |
1950 | printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n", |
1951 | start, len, em->start, em->len); | |
56b453c9 CM |
1952 | WARN_ON(1); |
1953 | } | |
70dec807 CM |
1954 | if (em->block_start == EXTENT_MAP_INLINE && page) |
1955 | free_extent_map(em); | |
1956 | else | |
1957 | goto out; | |
a52d9a80 | 1958 | } |
d1310b2e | 1959 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 1960 | if (!em) { |
d1310b2e CM |
1961 | err = -ENOMEM; |
1962 | goto out; | |
a52d9a80 | 1963 | } |
d1310b2e CM |
1964 | |
1965 | em->start = EXTENT_MAP_HOLE; | |
1966 | em->len = (u64)-1; | |
a52d9a80 | 1967 | em->bdev = inode->i_sb->s_bdev; |
179e29e4 CM |
1968 | ret = btrfs_lookup_file_extent(trans, root, path, |
1969 | objectid, start, trans != NULL); | |
a52d9a80 CM |
1970 | if (ret < 0) { |
1971 | err = ret; | |
1972 | goto out; | |
1973 | } | |
1974 | ||
1975 | if (ret != 0) { | |
1976 | if (path->slots[0] == 0) | |
1977 | goto not_found; | |
1978 | path->slots[0]--; | |
1979 | } | |
1980 | ||
5f39d397 CM |
1981 | leaf = path->nodes[0]; |
1982 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 1983 | struct btrfs_file_extent_item); |
a52d9a80 | 1984 | /* are we inside the extent that was found? */ |
5f39d397 CM |
1985 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
1986 | found_type = btrfs_key_type(&found_key); | |
1987 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
1988 | found_type != BTRFS_EXTENT_DATA_KEY) { |
1989 | goto not_found; | |
1990 | } | |
1991 | ||
5f39d397 CM |
1992 | found_type = btrfs_file_extent_type(leaf, item); |
1993 | extent_start = found_key.offset; | |
a52d9a80 CM |
1994 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
1995 | extent_end = extent_start + | |
db94535d | 1996 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 1997 | err = 0; |
b888db2b | 1998 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
1999 | em->start = start; |
2000 | if (start < extent_start) { | |
d1310b2e | 2001 | if (start + len <= extent_start) |
b888db2b | 2002 | goto not_found; |
d1310b2e | 2003 | em->len = extent_end - extent_start; |
a52d9a80 | 2004 | } else { |
d1310b2e | 2005 | em->len = len; |
a52d9a80 CM |
2006 | } |
2007 | goto not_found_em; | |
2008 | } | |
db94535d CM |
2009 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2010 | if (bytenr == 0) { | |
a52d9a80 | 2011 | em->start = extent_start; |
d1310b2e | 2012 | em->len = extent_end - extent_start; |
5f39d397 | 2013 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2014 | goto insert; |
2015 | } | |
db94535d CM |
2016 | bytenr += btrfs_file_extent_offset(leaf, item); |
2017 | em->block_start = bytenr; | |
a52d9a80 | 2018 | em->start = extent_start; |
d1310b2e | 2019 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2020 | goto insert; |
2021 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2022 | u64 page_start; |
5f39d397 | 2023 | unsigned long ptr; |
a52d9a80 | 2024 | char *map; |
3326d1b0 CM |
2025 | size_t size; |
2026 | size_t extent_offset; | |
2027 | size_t copy_size; | |
a52d9a80 | 2028 | |
5f39d397 CM |
2029 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2030 | path->slots[0])); | |
d1310b2e CM |
2031 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2032 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2033 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2034 | em->start = start; |
2035 | if (start < extent_start) { | |
d1310b2e | 2036 | if (start + len <= extent_start) |
b888db2b | 2037 | goto not_found; |
d1310b2e | 2038 | em->len = extent_end - extent_start; |
a52d9a80 | 2039 | } else { |
d1310b2e | 2040 | em->len = len; |
a52d9a80 CM |
2041 | } |
2042 | goto not_found_em; | |
2043 | } | |
689f9346 | 2044 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2045 | |
2046 | if (!page) { | |
2047 | em->start = extent_start; | |
d1310b2e | 2048 | em->len = size; |
689f9346 Y |
2049 | goto out; |
2050 | } | |
5f39d397 | 2051 | |
70dec807 CM |
2052 | page_start = page_offset(page) + pg_offset; |
2053 | extent_offset = page_start - extent_start; | |
2054 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2055 | size - extent_offset); |
3326d1b0 | 2056 | em->start = extent_start + extent_offset; |
70dec807 CM |
2057 | em->len = (copy_size + root->sectorsize - 1) & |
2058 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2059 | map = kmap(page); |
2060 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2061 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2062 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2063 | copy_size); |
2064 | flush_dcache_page(page); | |
2065 | } else if (create && PageUptodate(page)) { | |
2066 | if (!trans) { | |
2067 | kunmap(page); | |
2068 | free_extent_map(em); | |
2069 | em = NULL; | |
2070 | btrfs_release_path(root, path); | |
2071 | trans = btrfs_start_transaction(root, 1); | |
2072 | goto again; | |
2073 | } | |
70dec807 | 2074 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2075 | copy_size); |
2076 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2077 | } |
a52d9a80 | 2078 | kunmap(page); |
d1310b2e CM |
2079 | set_extent_uptodate(io_tree, em->start, |
2080 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2081 | goto insert; |
2082 | } else { | |
2083 | printk("unkknown found_type %d\n", found_type); | |
2084 | WARN_ON(1); | |
2085 | } | |
2086 | not_found: | |
2087 | em->start = start; | |
d1310b2e | 2088 | em->len = len; |
a52d9a80 | 2089 | not_found_em: |
5f39d397 | 2090 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2091 | insert: |
2092 | btrfs_release_path(root, path); | |
d1310b2e CM |
2093 | if (em->start > start || extent_map_end(em) <= start) { |
2094 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2095 | err = -EIO; |
2096 | goto out; | |
2097 | } | |
d1310b2e CM |
2098 | |
2099 | err = 0; | |
2100 | spin_lock(&em_tree->lock); | |
a52d9a80 CM |
2101 | ret = add_extent_mapping(em_tree, em); |
2102 | if (ret == -EEXIST) { | |
2103 | free_extent_map(em); | |
d1310b2e CM |
2104 | em = lookup_extent_mapping(em_tree, start, len); |
2105 | if (!em) { | |
a52d9a80 | 2106 | err = -EIO; |
d1310b2e | 2107 | printk("failing to insert %Lu %Lu\n", start, len); |
a52d9a80 | 2108 | } |
a52d9a80 | 2109 | } |
d1310b2e | 2110 | spin_unlock(&em_tree->lock); |
a52d9a80 CM |
2111 | out: |
2112 | btrfs_free_path(path); | |
2113 | if (trans) { | |
2114 | ret = btrfs_end_transaction(trans, root); | |
2115 | if (!err) | |
2116 | err = ret; | |
2117 | } | |
2118 | mutex_unlock(&root->fs_info->fs_mutex); | |
2119 | if (err) { | |
2120 | free_extent_map(em); | |
2121 | WARN_ON(1); | |
2122 | return ERR_PTR(err); | |
2123 | } | |
2124 | return em; | |
2125 | } | |
2126 | ||
d396c6f5 | 2127 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2128 | { |
d396c6f5 | 2129 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2130 | } |
2131 | ||
a52d9a80 | 2132 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2133 | { |
d1310b2e CM |
2134 | struct extent_io_tree *tree; |
2135 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2136 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2137 | } |
1832a6d5 | 2138 | |
a52d9a80 | 2139 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2140 | { |
d1310b2e | 2141 | struct extent_io_tree *tree; |
b888db2b CM |
2142 | |
2143 | ||
2144 | if (current->flags & PF_MEMALLOC) { | |
2145 | redirty_page_for_writepage(wbc, page); | |
2146 | unlock_page(page); | |
2147 | return 0; | |
2148 | } | |
d1310b2e | 2149 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2150 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2151 | } |
2152 | ||
b293f02e CM |
2153 | static int btrfs_writepages(struct address_space *mapping, |
2154 | struct writeback_control *wbc) | |
2155 | { | |
d1310b2e CM |
2156 | struct extent_io_tree *tree; |
2157 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2158 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2159 | } | |
2160 | ||
3ab2fb5a CM |
2161 | static int |
2162 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2163 | struct list_head *pages, unsigned nr_pages) | |
2164 | { | |
d1310b2e CM |
2165 | struct extent_io_tree *tree; |
2166 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2167 | return extent_readpages(tree, mapping, pages, nr_pages, |
2168 | btrfs_get_extent); | |
2169 | } | |
2170 | ||
70dec807 | 2171 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2172 | { |
d1310b2e CM |
2173 | struct extent_io_tree *tree; |
2174 | struct extent_map_tree *map; | |
a52d9a80 | 2175 | int ret; |
8c2383c3 | 2176 | |
d1310b2e CM |
2177 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2178 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2179 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
2180 | if (ret == 1) { |
2181 | ClearPagePrivate(page); | |
2182 | set_page_private(page, 0); | |
2183 | page_cache_release(page); | |
39279cc3 | 2184 | } |
a52d9a80 | 2185 | return ret; |
39279cc3 CM |
2186 | } |
2187 | ||
a52d9a80 | 2188 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2189 | { |
d1310b2e | 2190 | struct extent_io_tree *tree; |
39279cc3 | 2191 | |
d1310b2e | 2192 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 CM |
2193 | extent_invalidatepage(tree, page, offset); |
2194 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
2195 | } |
2196 | ||
9ebefb18 CM |
2197 | /* |
2198 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2199 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2200 | * be careful to check for EOF conditions here. We set the page up correctly | |
2201 | * for a written page which means we get ENOSPC checking when writing into | |
2202 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2203 | * support these features. | |
2204 | * | |
2205 | * We are not allowed to take the i_mutex here so we have to play games to | |
2206 | * protect against truncate races as the page could now be beyond EOF. Because | |
2207 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2208 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2209 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2210 | * unlock the page. | |
2211 | */ | |
2212 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2213 | { | |
6da6abae | 2214 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2215 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2216 | unsigned long end; |
2217 | loff_t size; | |
1832a6d5 | 2218 | int ret; |
a52d9a80 | 2219 | u64 page_start; |
9ebefb18 | 2220 | |
1832a6d5 CM |
2221 | mutex_lock(&root->fs_info->fs_mutex); |
2222 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2223 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2224 | if (ret) |
2225 | goto out; | |
2226 | ||
2227 | ret = -EINVAL; | |
2228 | ||
9ebefb18 CM |
2229 | lock_page(page); |
2230 | wait_on_page_writeback(page); | |
9ebefb18 | 2231 | size = i_size_read(inode); |
35ebb934 | 2232 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2233 | |
9ebefb18 | 2234 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2235 | (page_start > size)) { |
9ebefb18 CM |
2236 | /* page got truncated out from underneath us */ |
2237 | goto out_unlock; | |
2238 | } | |
2239 | ||
2240 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2241 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2242 | end = size & ~PAGE_CACHE_MASK; |
2243 | else | |
2244 | end = PAGE_CACHE_SIZE; | |
2245 | ||
b888db2b | 2246 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2247 | |
2248 | out_unlock: | |
2249 | unlock_page(page); | |
1832a6d5 | 2250 | out: |
9ebefb18 CM |
2251 | return ret; |
2252 | } | |
2253 | ||
39279cc3 CM |
2254 | static void btrfs_truncate(struct inode *inode) |
2255 | { | |
2256 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2257 | int ret; | |
2258 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2259 | unsigned long nr; |
39279cc3 CM |
2260 | |
2261 | if (!S_ISREG(inode->i_mode)) | |
2262 | return; | |
2263 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2264 | return; | |
2265 | ||
2266 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2267 | ||
2268 | mutex_lock(&root->fs_info->fs_mutex); | |
2269 | trans = btrfs_start_transaction(root, 1); | |
2270 | btrfs_set_trans_block_group(trans, inode); | |
2271 | ||
2272 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
85e21bac CM |
2273 | ret = btrfs_truncate_in_trans(trans, root, inode, |
2274 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 2275 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2276 | nr = trans->blocks_used; |
5f39d397 | 2277 | |
39279cc3 CM |
2278 | ret = btrfs_end_transaction(trans, root); |
2279 | BUG_ON(ret); | |
2280 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2281 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2282 | btrfs_throttle(root); |
39279cc3 CM |
2283 | } |
2284 | ||
4313b399 CM |
2285 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2286 | int namelen) | |
39279cc3 CM |
2287 | { |
2288 | struct btrfs_trans_handle *trans; | |
2289 | struct btrfs_key key; | |
2290 | struct btrfs_root_item root_item; | |
2291 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2292 | struct extent_buffer *leaf; |
dc17ff8f | 2293 | struct btrfs_root *new_root = root; |
39279cc3 CM |
2294 | struct inode *inode; |
2295 | struct inode *dir; | |
2296 | int ret; | |
54aa1f4d | 2297 | int err; |
39279cc3 CM |
2298 | u64 objectid; |
2299 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2300 | unsigned long nr = 1; |
39279cc3 CM |
2301 | |
2302 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2303 | ret = btrfs_check_free_space(root, 1, 0); |
2304 | if (ret) | |
2305 | goto fail_commit; | |
2306 | ||
39279cc3 CM |
2307 | trans = btrfs_start_transaction(root, 1); |
2308 | BUG_ON(!trans); | |
2309 | ||
7bb86316 CM |
2310 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2311 | 0, &objectid); | |
2312 | if (ret) | |
2313 | goto fail; | |
2314 | ||
2315 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2316 | objectid, trans->transid, 0, 0, | |
2317 | 0, 0); | |
5f39d397 CM |
2318 | if (IS_ERR(leaf)) |
2319 | return PTR_ERR(leaf); | |
2320 | ||
2321 | btrfs_set_header_nritems(leaf, 0); | |
2322 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2323 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2324 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2325 | btrfs_set_header_owner(leaf, objectid); |
2326 | ||
5f39d397 CM |
2327 | write_extent_buffer(leaf, root->fs_info->fsid, |
2328 | (unsigned long)btrfs_header_fsid(leaf), | |
2329 | BTRFS_FSID_SIZE); | |
2330 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2331 | |
2332 | inode_item = &root_item.inode; | |
2333 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2334 | inode_item->generation = cpu_to_le64(1); |
2335 | inode_item->size = cpu_to_le64(3); | |
2336 | inode_item->nlink = cpu_to_le32(1); | |
2337 | inode_item->nblocks = cpu_to_le64(1); | |
2338 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2339 | |
db94535d CM |
2340 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2341 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2342 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2343 | btrfs_set_root_used(&root_item, 0); |
2344 | ||
5eda7b5e CM |
2345 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2346 | root_item.drop_level = 0; | |
5f39d397 CM |
2347 | |
2348 | free_extent_buffer(leaf); | |
2349 | leaf = NULL; | |
39279cc3 | 2350 | |
39279cc3 CM |
2351 | btrfs_set_root_dirid(&root_item, new_dirid); |
2352 | ||
2353 | key.objectid = objectid; | |
2354 | key.offset = 1; | |
39279cc3 CM |
2355 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2356 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2357 | &root_item); | |
54aa1f4d CM |
2358 | if (ret) |
2359 | goto fail; | |
39279cc3 CM |
2360 | |
2361 | /* | |
2362 | * insert the directory item | |
2363 | */ | |
2364 | key.offset = (u64)-1; | |
2365 | dir = root->fs_info->sb->s_root->d_inode; | |
2366 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2367 | name, namelen, dir->i_ino, &key, | |
2368 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2369 | if (ret) |
2370 | goto fail; | |
39279cc3 | 2371 | |
3954401f CM |
2372 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2373 | name, namelen, objectid, | |
2374 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2375 | if (ret) | |
2376 | goto fail; | |
2377 | ||
39279cc3 | 2378 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2379 | if (ret) |
2380 | goto fail_commit; | |
39279cc3 | 2381 | |
58176a96 | 2382 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2383 | BUG_ON(!new_root); |
2384 | ||
2385 | trans = btrfs_start_transaction(new_root, 1); | |
2386 | BUG_ON(!trans); | |
2387 | ||
9c58309d CM |
2388 | inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid, |
2389 | new_dirid, | |
39279cc3 | 2390 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); |
54aa1f4d CM |
2391 | if (IS_ERR(inode)) |
2392 | goto fail; | |
39279cc3 CM |
2393 | inode->i_op = &btrfs_dir_inode_operations; |
2394 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2395 | new_root->inode = inode; |
39279cc3 | 2396 | |
3954401f CM |
2397 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2398 | new_dirid); | |
39279cc3 | 2399 | inode->i_nlink = 1; |
3954401f | 2400 | inode->i_size = 0; |
39279cc3 | 2401 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2402 | if (ret) |
2403 | goto fail; | |
2404 | fail: | |
d3c2fdcf | 2405 | nr = trans->blocks_used; |
dc17ff8f | 2406 | err = btrfs_commit_transaction(trans, new_root); |
54aa1f4d CM |
2407 | if (err && !ret) |
2408 | ret = err; | |
2409 | fail_commit: | |
39279cc3 | 2410 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2411 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2412 | btrfs_throttle(root); |
54aa1f4d | 2413 | return ret; |
39279cc3 CM |
2414 | } |
2415 | ||
2416 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2417 | { | |
3063d29f | 2418 | struct btrfs_pending_snapshot *pending_snapshot; |
39279cc3 | 2419 | struct btrfs_trans_handle *trans; |
39279cc3 | 2420 | int ret; |
54aa1f4d | 2421 | int err; |
1832a6d5 | 2422 | unsigned long nr = 0; |
39279cc3 CM |
2423 | |
2424 | if (!root->ref_cows) | |
2425 | return -EINVAL; | |
2426 | ||
2427 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2428 | ret = btrfs_check_free_space(root, 1, 0); |
2429 | if (ret) | |
2430 | goto fail_unlock; | |
2431 | ||
3063d29f CM |
2432 | pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); |
2433 | if (!pending_snapshot) { | |
2434 | ret = -ENOMEM; | |
2435 | goto fail_unlock; | |
2436 | } | |
fb4bc1e0 | 2437 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); |
3063d29f CM |
2438 | if (!pending_snapshot->name) { |
2439 | ret = -ENOMEM; | |
2440 | kfree(pending_snapshot); | |
2441 | goto fail_unlock; | |
2442 | } | |
fb4bc1e0 Y |
2443 | memcpy(pending_snapshot->name, name, namelen); |
2444 | pending_snapshot->name[namelen] = '\0'; | |
39279cc3 CM |
2445 | trans = btrfs_start_transaction(root, 1); |
2446 | BUG_ON(!trans); | |
3063d29f CM |
2447 | pending_snapshot->root = root; |
2448 | list_add(&pending_snapshot->list, | |
2449 | &trans->transaction->pending_snapshots); | |
39279cc3 | 2450 | ret = btrfs_update_inode(trans, root, root->inode); |
54aa1f4d | 2451 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2452 | |
1832a6d5 | 2453 | fail_unlock: |
39279cc3 | 2454 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2455 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2456 | btrfs_throttle(root); |
54aa1f4d | 2457 | return ret; |
39279cc3 CM |
2458 | } |
2459 | ||
edbd8d4e | 2460 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2461 | struct file_ra_state *ra, struct file *file, |
2462 | pgoff_t offset, pgoff_t last_index) | |
2463 | { | |
2464 | pgoff_t req_size; | |
2465 | ||
2466 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2467 | req_size = last_index - offset + 1; | |
2468 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2469 | return offset; | |
2470 | #else | |
2471 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2472 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2473 | return offset + req_size; | |
2474 | #endif | |
2475 | } | |
2476 | ||
2477 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2478 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2479 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 2480 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
86479a04 CM |
2481 | struct page *page; |
2482 | unsigned long last_index; | |
2483 | unsigned long ra_index = 0; | |
2484 | u64 page_start; | |
2485 | u64 page_end; | |
2486 | unsigned long i; | |
1832a6d5 CM |
2487 | int ret; |
2488 | ||
2489 | mutex_lock(&root->fs_info->fs_mutex); | |
2490 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2491 | mutex_unlock(&root->fs_info->fs_mutex); | |
2492 | if (ret) | |
2493 | return -ENOSPC; | |
86479a04 CM |
2494 | |
2495 | mutex_lock(&inode->i_mutex); | |
2496 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2497 | for (i = 0; i <= last_index; i++) { | |
2498 | if (i == ra_index) { | |
edbd8d4e CM |
2499 | ra_index = btrfs_force_ra(inode->i_mapping, |
2500 | &file->f_ra, | |
2501 | file, ra_index, last_index); | |
86479a04 CM |
2502 | } |
2503 | page = grab_cache_page(inode->i_mapping, i); | |
2504 | if (!page) | |
2505 | goto out_unlock; | |
2506 | if (!PageUptodate(page)) { | |
2507 | btrfs_readpage(NULL, page); | |
2508 | lock_page(page); | |
2509 | if (!PageUptodate(page)) { | |
2510 | unlock_page(page); | |
2511 | page_cache_release(page); | |
2512 | goto out_unlock; | |
2513 | } | |
2514 | } | |
35ebb934 | 2515 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2516 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2517 | ||
d1310b2e | 2518 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 2519 | set_extent_delalloc(io_tree, page_start, |
86479a04 | 2520 | page_end, GFP_NOFS); |
edbd8d4e | 2521 | |
d1310b2e | 2522 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
86479a04 CM |
2523 | set_page_dirty(page); |
2524 | unlock_page(page); | |
2525 | page_cache_release(page); | |
2526 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2527 | } | |
2528 | ||
2529 | out_unlock: | |
2530 | mutex_unlock(&inode->i_mutex); | |
2531 | return 0; | |
2532 | } | |
2533 | ||
edbd8d4e CM |
2534 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2535 | { | |
2536 | u64 new_size; | |
2537 | u64 old_size; | |
2538 | struct btrfs_ioctl_vol_args *vol_args; | |
2539 | struct btrfs_trans_handle *trans; | |
2540 | char *sizestr; | |
2541 | int ret = 0; | |
2542 | int namelen; | |
2543 | int mod = 0; | |
2544 | ||
2545 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2546 | ||
2547 | if (!vol_args) | |
2548 | return -ENOMEM; | |
2549 | ||
2550 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2551 | ret = -EFAULT; | |
2552 | goto out; | |
2553 | } | |
2554 | namelen = strlen(vol_args->name); | |
2555 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2556 | ret = -EINVAL; | |
2557 | goto out; | |
2558 | } | |
2559 | ||
2560 | sizestr = vol_args->name; | |
2561 | if (!strcmp(sizestr, "max")) | |
2562 | new_size = root->fs_info->sb->s_bdev->bd_inode->i_size; | |
2563 | else { | |
2564 | if (sizestr[0] == '-') { | |
2565 | mod = -1; | |
2566 | sizestr++; | |
2567 | } else if (sizestr[0] == '+') { | |
2568 | mod = 1; | |
2569 | sizestr++; | |
2570 | } | |
2571 | new_size = btrfs_parse_size(sizestr); | |
2572 | if (new_size == 0) { | |
2573 | ret = -EINVAL; | |
2574 | goto out; | |
2575 | } | |
2576 | } | |
2577 | ||
2578 | mutex_lock(&root->fs_info->fs_mutex); | |
2579 | old_size = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
2580 | ||
2581 | if (mod < 0) { | |
2582 | if (new_size > old_size) { | |
2583 | ret = -EINVAL; | |
2584 | goto out_unlock; | |
2585 | } | |
2586 | new_size = old_size - new_size; | |
2587 | } else if (mod > 0) { | |
2588 | new_size = old_size + new_size; | |
2589 | } | |
2590 | ||
2591 | if (new_size < 256 * 1024 * 1024) { | |
2592 | ret = -EINVAL; | |
2593 | goto out_unlock; | |
2594 | } | |
2595 | if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) { | |
2596 | ret = -EFBIG; | |
2597 | goto out_unlock; | |
2598 | } | |
f9ef6604 CM |
2599 | |
2600 | do_div(new_size, root->sectorsize); | |
2601 | new_size *= root->sectorsize; | |
edbd8d4e CM |
2602 | |
2603 | printk("new size is %Lu\n", new_size); | |
2604 | if (new_size > old_size) { | |
2605 | trans = btrfs_start_transaction(root, 1); | |
2606 | ret = btrfs_grow_extent_tree(trans, root, new_size); | |
2607 | btrfs_commit_transaction(trans, root); | |
2608 | } else { | |
2609 | ret = btrfs_shrink_extent_tree(root, new_size); | |
2610 | } | |
2611 | ||
2612 | out_unlock: | |
2613 | mutex_unlock(&root->fs_info->fs_mutex); | |
2614 | out: | |
2615 | kfree(vol_args); | |
2616 | return ret; | |
2617 | } | |
2618 | ||
4313b399 CM |
2619 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
2620 | void __user *arg) | |
39279cc3 | 2621 | { |
4aec2b52 | 2622 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2623 | struct btrfs_dir_item *di; |
39279cc3 CM |
2624 | struct btrfs_path *path; |
2625 | u64 root_dirid; | |
4aec2b52 CM |
2626 | int namelen; |
2627 | int ret; | |
39279cc3 | 2628 | |
4aec2b52 | 2629 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2630 | |
4aec2b52 CM |
2631 | if (!vol_args) |
2632 | return -ENOMEM; | |
2633 | ||
2634 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2635 | ret = -EFAULT; | |
2636 | goto out; | |
2637 | } | |
2638 | ||
2639 | namelen = strlen(vol_args->name); | |
2640 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2641 | ret = -EINVAL; | |
2642 | goto out; | |
2643 | } | |
2644 | if (strchr(vol_args->name, '/')) { | |
2645 | ret = -EINVAL; | |
2646 | goto out; | |
2647 | } | |
d03581f4 CH |
2648 | |
2649 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2650 | if (!path) { |
2651 | ret = -ENOMEM; | |
2652 | goto out; | |
2653 | } | |
d03581f4 CH |
2654 | |
2655 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2656 | mutex_lock(&root->fs_info->fs_mutex); | |
2657 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2658 | path, root_dirid, | |
4aec2b52 | 2659 | vol_args->name, namelen, 0); |
d03581f4 CH |
2660 | mutex_unlock(&root->fs_info->fs_mutex); |
2661 | btrfs_free_path(path); | |
4aec2b52 CM |
2662 | |
2663 | if (di && !IS_ERR(di)) { | |
2664 | ret = -EEXIST; | |
2665 | goto out; | |
2666 | } | |
2667 | ||
2668 | if (IS_ERR(di)) { | |
2669 | ret = PTR_ERR(di); | |
2670 | goto out; | |
2671 | } | |
d03581f4 CH |
2672 | |
2673 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2674 | ret = create_subvol(root, vol_args->name, namelen); |
2675 | else | |
2676 | ret = create_snapshot(root, vol_args->name, namelen); | |
2677 | out: | |
2678 | kfree(vol_args); | |
2679 | return ret; | |
d03581f4 CH |
2680 | } |
2681 | ||
2682 | static int btrfs_ioctl_defrag(struct file *file) | |
2683 | { | |
6da6abae | 2684 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2685 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2686 | ||
2687 | switch (inode->i_mode & S_IFMT) { | |
2688 | case S_IFDIR: | |
39279cc3 | 2689 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2690 | btrfs_defrag_root(root, 0); |
2691 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2692 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2693 | break; |
d03581f4 CH |
2694 | case S_IFREG: |
2695 | btrfs_defrag_file(file); | |
2696 | break; | |
2697 | } | |
2698 | ||
2699 | return 0; | |
2700 | } | |
6702ed49 | 2701 | |
d03581f4 CH |
2702 | long btrfs_ioctl(struct file *file, unsigned int |
2703 | cmd, unsigned long arg) | |
2704 | { | |
6da6abae | 2705 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2706 | |
2707 | switch (cmd) { | |
2708 | case BTRFS_IOC_SNAP_CREATE: | |
2709 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2710 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2711 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
2712 | case BTRFS_IOC_RESIZE: |
2713 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
39279cc3 | 2714 | } |
d03581f4 CH |
2715 | |
2716 | return -ENOTTY; | |
39279cc3 CM |
2717 | } |
2718 | ||
39279cc3 CM |
2719 | /* |
2720 | * Called inside transaction, so use GFP_NOFS | |
2721 | */ | |
2722 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2723 | { | |
2724 | struct btrfs_inode *ei; | |
2725 | ||
2726 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2727 | if (!ei) | |
2728 | return NULL; | |
15ee9bc7 | 2729 | ei->last_trans = 0; |
dc17ff8f | 2730 | ei->ordered_trans = 0; |
39279cc3 CM |
2731 | return &ei->vfs_inode; |
2732 | } | |
2733 | ||
2734 | void btrfs_destroy_inode(struct inode *inode) | |
2735 | { | |
2736 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2737 | WARN_ON(inode->i_data.nrpages); | |
2738 | ||
8c416c9e | 2739 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
2740 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2741 | } | |
2742 | ||
44ec0b71 CM |
2743 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2744 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2745 | #else | |
39279cc3 CM |
2746 | static void init_once(void * foo, struct kmem_cache * cachep, |
2747 | unsigned long flags) | |
44ec0b71 | 2748 | #endif |
39279cc3 CM |
2749 | { |
2750 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2751 | ||
2752 | inode_init_once(&ei->vfs_inode); | |
2753 | } | |
2754 | ||
2755 | void btrfs_destroy_cachep(void) | |
2756 | { | |
2757 | if (btrfs_inode_cachep) | |
2758 | kmem_cache_destroy(btrfs_inode_cachep); | |
2759 | if (btrfs_trans_handle_cachep) | |
2760 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2761 | if (btrfs_transaction_cachep) | |
2762 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2763 | if (btrfs_bit_radix_cachep) | |
2764 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2765 | if (btrfs_path_cachep) | |
2766 | kmem_cache_destroy(btrfs_path_cachep); | |
2767 | } | |
2768 | ||
86479a04 | 2769 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2770 | unsigned long extra_flags, |
44ec0b71 CM |
2771 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2772 | void (*ctor)(struct kmem_cache *, void *) | |
2773 | #else | |
92fee66d | 2774 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2775 | unsigned long) |
2776 | #endif | |
2777 | ) | |
92fee66d CM |
2778 | { |
2779 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2780 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2781 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2782 | ,NULL | |
2783 | #endif | |
2784 | ); | |
2785 | } | |
2786 | ||
39279cc3 CM |
2787 | int btrfs_init_cachep(void) |
2788 | { | |
86479a04 | 2789 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2790 | sizeof(struct btrfs_inode), |
2791 | 0, init_once); | |
39279cc3 CM |
2792 | if (!btrfs_inode_cachep) |
2793 | goto fail; | |
86479a04 CM |
2794 | btrfs_trans_handle_cachep = |
2795 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2796 | sizeof(struct btrfs_trans_handle), | |
2797 | 0, NULL); | |
39279cc3 CM |
2798 | if (!btrfs_trans_handle_cachep) |
2799 | goto fail; | |
86479a04 | 2800 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2801 | sizeof(struct btrfs_transaction), |
92fee66d | 2802 | 0, NULL); |
39279cc3 CM |
2803 | if (!btrfs_transaction_cachep) |
2804 | goto fail; | |
86479a04 | 2805 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2806 | sizeof(struct btrfs_path), |
92fee66d | 2807 | 0, NULL); |
39279cc3 CM |
2808 | if (!btrfs_path_cachep) |
2809 | goto fail; | |
86479a04 | 2810 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 2811 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
2812 | if (!btrfs_bit_radix_cachep) |
2813 | goto fail; | |
2814 | return 0; | |
2815 | fail: | |
2816 | btrfs_destroy_cachep(); | |
2817 | return -ENOMEM; | |
2818 | } | |
2819 | ||
2820 | static int btrfs_getattr(struct vfsmount *mnt, | |
2821 | struct dentry *dentry, struct kstat *stat) | |
2822 | { | |
2823 | struct inode *inode = dentry->d_inode; | |
2824 | generic_fillattr(inode, stat); | |
d6667462 | 2825 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 2826 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
2827 | return 0; |
2828 | } | |
2829 | ||
2830 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
2831 | struct inode * new_dir,struct dentry *new_dentry) | |
2832 | { | |
2833 | struct btrfs_trans_handle *trans; | |
2834 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
2835 | struct inode *new_inode = new_dentry->d_inode; | |
2836 | struct inode *old_inode = old_dentry->d_inode; | |
2837 | struct timespec ctime = CURRENT_TIME; | |
2838 | struct btrfs_path *path; | |
39279cc3 CM |
2839 | int ret; |
2840 | ||
2841 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
2842 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
2843 | return -ENOTEMPTY; | |
2844 | } | |
5f39d397 | 2845 | |
39279cc3 | 2846 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2847 | ret = btrfs_check_free_space(root, 1, 0); |
2848 | if (ret) | |
2849 | goto out_unlock; | |
2850 | ||
39279cc3 | 2851 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2852 | |
39279cc3 CM |
2853 | btrfs_set_trans_block_group(trans, new_dir); |
2854 | path = btrfs_alloc_path(); | |
2855 | if (!path) { | |
2856 | ret = -ENOMEM; | |
2857 | goto out_fail; | |
2858 | } | |
2859 | ||
2860 | old_dentry->d_inode->i_nlink++; | |
2861 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
2862 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
2863 | old_inode->i_ctime = ctime; | |
5f39d397 | 2864 | |
39279cc3 CM |
2865 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
2866 | if (ret) | |
2867 | goto out_fail; | |
2868 | ||
2869 | if (new_inode) { | |
2870 | new_inode->i_ctime = CURRENT_TIME; | |
2871 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
2872 | if (ret) | |
2873 | goto out_fail; | |
39279cc3 | 2874 | } |
9c58309d | 2875 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1); |
39279cc3 CM |
2876 | if (ret) |
2877 | goto out_fail; | |
2878 | ||
2879 | out_fail: | |
2880 | btrfs_free_path(path); | |
2881 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 2882 | out_unlock: |
39279cc3 CM |
2883 | mutex_unlock(&root->fs_info->fs_mutex); |
2884 | return ret; | |
2885 | } | |
2886 | ||
2887 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
2888 | const char *symname) | |
2889 | { | |
2890 | struct btrfs_trans_handle *trans; | |
2891 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2892 | struct btrfs_path *path; | |
2893 | struct btrfs_key key; | |
1832a6d5 | 2894 | struct inode *inode = NULL; |
39279cc3 CM |
2895 | int err; |
2896 | int drop_inode = 0; | |
2897 | u64 objectid; | |
2898 | int name_len; | |
2899 | int datasize; | |
5f39d397 | 2900 | unsigned long ptr; |
39279cc3 | 2901 | struct btrfs_file_extent_item *ei; |
5f39d397 | 2902 | struct extent_buffer *leaf; |
1832a6d5 | 2903 | unsigned long nr = 0; |
39279cc3 CM |
2904 | |
2905 | name_len = strlen(symname) + 1; | |
2906 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
2907 | return -ENAMETOOLONG; | |
1832a6d5 | 2908 | |
39279cc3 | 2909 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2910 | err = btrfs_check_free_space(root, 1, 0); |
2911 | if (err) | |
2912 | goto out_fail; | |
2913 | ||
39279cc3 CM |
2914 | trans = btrfs_start_transaction(root, 1); |
2915 | btrfs_set_trans_block_group(trans, dir); | |
2916 | ||
2917 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2918 | if (err) { | |
2919 | err = -ENOSPC; | |
2920 | goto out_unlock; | |
2921 | } | |
2922 | ||
9c58309d CM |
2923 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2924 | dentry->d_name.len, | |
2925 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2926 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); |
2927 | err = PTR_ERR(inode); | |
2928 | if (IS_ERR(inode)) | |
2929 | goto out_unlock; | |
2930 | ||
2931 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 2932 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
2933 | if (err) |
2934 | drop_inode = 1; | |
2935 | else { | |
2936 | inode->i_mapping->a_ops = &btrfs_aops; | |
2937 | inode->i_fop = &btrfs_file_operations; | |
2938 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
2939 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2940 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 2941 | inode->i_mapping, GFP_NOFS); |
9069218d | 2942 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e | 2943 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
2944 | } |
2945 | dir->i_sb->s_dirt = 1; | |
2946 | btrfs_update_inode_block_group(trans, inode); | |
2947 | btrfs_update_inode_block_group(trans, dir); | |
2948 | if (drop_inode) | |
2949 | goto out_unlock; | |
2950 | ||
2951 | path = btrfs_alloc_path(); | |
2952 | BUG_ON(!path); | |
2953 | key.objectid = inode->i_ino; | |
2954 | key.offset = 0; | |
39279cc3 CM |
2955 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
2956 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
2957 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
2958 | datasize); | |
54aa1f4d CM |
2959 | if (err) { |
2960 | drop_inode = 1; | |
2961 | goto out_unlock; | |
2962 | } | |
5f39d397 CM |
2963 | leaf = path->nodes[0]; |
2964 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
2965 | struct btrfs_file_extent_item); | |
2966 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
2967 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
2968 | BTRFS_FILE_EXTENT_INLINE); |
2969 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
2970 | write_extent_buffer(leaf, symname, ptr, name_len); |
2971 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 2972 | btrfs_free_path(path); |
5f39d397 | 2973 | |
39279cc3 CM |
2974 | inode->i_op = &btrfs_symlink_inode_operations; |
2975 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
2976 | inode->i_size = name_len - 1; | |
54aa1f4d CM |
2977 | err = btrfs_update_inode(trans, root, inode); |
2978 | if (err) | |
2979 | drop_inode = 1; | |
39279cc3 CM |
2980 | |
2981 | out_unlock: | |
d3c2fdcf | 2982 | nr = trans->blocks_used; |
39279cc3 | 2983 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2984 | out_fail: |
39279cc3 | 2985 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
2986 | if (drop_inode) { |
2987 | inode_dec_link_count(inode); | |
2988 | iput(inode); | |
2989 | } | |
d3c2fdcf | 2990 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2991 | btrfs_throttle(root); |
39279cc3 CM |
2992 | return err; |
2993 | } | |
fdebe2bd Y |
2994 | static int btrfs_permission(struct inode *inode, int mask, |
2995 | struct nameidata *nd) | |
2996 | { | |
2997 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
2998 | return -EACCES; | |
2999 | return generic_permission(inode, mask, NULL); | |
3000 | } | |
39279cc3 CM |
3001 | |
3002 | static struct inode_operations btrfs_dir_inode_operations = { | |
3003 | .lookup = btrfs_lookup, | |
3004 | .create = btrfs_create, | |
3005 | .unlink = btrfs_unlink, | |
3006 | .link = btrfs_link, | |
3007 | .mkdir = btrfs_mkdir, | |
3008 | .rmdir = btrfs_rmdir, | |
3009 | .rename = btrfs_rename, | |
3010 | .symlink = btrfs_symlink, | |
3011 | .setattr = btrfs_setattr, | |
618e21d5 | 3012 | .mknod = btrfs_mknod, |
5103e947 JB |
3013 | .setxattr = generic_setxattr, |
3014 | .getxattr = generic_getxattr, | |
3015 | .listxattr = btrfs_listxattr, | |
3016 | .removexattr = generic_removexattr, | |
fdebe2bd | 3017 | .permission = btrfs_permission, |
39279cc3 | 3018 | }; |
39279cc3 CM |
3019 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3020 | .lookup = btrfs_lookup, | |
fdebe2bd | 3021 | .permission = btrfs_permission, |
39279cc3 | 3022 | }; |
39279cc3 CM |
3023 | static struct file_operations btrfs_dir_file_operations = { |
3024 | .llseek = generic_file_llseek, | |
3025 | .read = generic_read_dir, | |
3026 | .readdir = btrfs_readdir, | |
34287aa3 | 3027 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 3028 | #ifdef CONFIG_COMPAT |
34287aa3 | 3029 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
3030 | #endif |
3031 | }; | |
3032 | ||
d1310b2e | 3033 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 3034 | .fill_delalloc = run_delalloc_range, |
065631f6 | 3035 | .submit_bio_hook = btrfs_submit_bio_hook, |
07157aac CM |
3036 | .readpage_io_hook = btrfs_readpage_io_hook, |
3037 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
b0c68f8b CM |
3038 | .set_bit_hook = btrfs_set_bit_hook, |
3039 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
3040 | }; |
3041 | ||
39279cc3 CM |
3042 | static struct address_space_operations btrfs_aops = { |
3043 | .readpage = btrfs_readpage, | |
3044 | .writepage = btrfs_writepage, | |
b293f02e | 3045 | .writepages = btrfs_writepages, |
3ab2fb5a | 3046 | .readpages = btrfs_readpages, |
39279cc3 | 3047 | .sync_page = block_sync_page, |
39279cc3 | 3048 | .bmap = btrfs_bmap, |
a52d9a80 CM |
3049 | .invalidatepage = btrfs_invalidatepage, |
3050 | .releasepage = btrfs_releasepage, | |
3051 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
3052 | }; |
3053 | ||
3054 | static struct address_space_operations btrfs_symlink_aops = { | |
3055 | .readpage = btrfs_readpage, | |
3056 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3057 | .invalidatepage = btrfs_invalidatepage, |
3058 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3059 | }; |
3060 | ||
3061 | static struct inode_operations btrfs_file_inode_operations = { | |
3062 | .truncate = btrfs_truncate, | |
3063 | .getattr = btrfs_getattr, | |
3064 | .setattr = btrfs_setattr, | |
5103e947 JB |
3065 | .setxattr = generic_setxattr, |
3066 | .getxattr = generic_getxattr, | |
3067 | .listxattr = btrfs_listxattr, | |
3068 | .removexattr = generic_removexattr, | |
fdebe2bd | 3069 | .permission = btrfs_permission, |
39279cc3 | 3070 | }; |
618e21d5 JB |
3071 | static struct inode_operations btrfs_special_inode_operations = { |
3072 | .getattr = btrfs_getattr, | |
3073 | .setattr = btrfs_setattr, | |
fdebe2bd | 3074 | .permission = btrfs_permission, |
618e21d5 | 3075 | }; |
39279cc3 CM |
3076 | static struct inode_operations btrfs_symlink_inode_operations = { |
3077 | .readlink = generic_readlink, | |
3078 | .follow_link = page_follow_link_light, | |
3079 | .put_link = page_put_link, | |
fdebe2bd | 3080 | .permission = btrfs_permission, |
39279cc3 | 3081 | }; |