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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
8f18cf13 | 19 | #include <linux/kernel.h> |
065631f6 | 20 | #include <linux/bio.h> |
39279cc3 | 21 | #include <linux/buffer_head.h> |
f2eb0a24 | 22 | #include <linux/file.h> |
39279cc3 CM |
23 | #include <linux/fs.h> |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/smp_lock.h> | |
30 | #include <linux/backing-dev.h> | |
31 | #include <linux/mpage.h> | |
32 | #include <linux/swap.h> | |
33 | #include <linux/writeback.h> | |
34 | #include <linux/statfs.h> | |
35 | #include <linux/compat.h> | |
9ebefb18 | 36 | #include <linux/bit_spinlock.h> |
92fee66d | 37 | #include <linux/version.h> |
5103e947 | 38 | #include <linux/xattr.h> |
39279cc3 CM |
39 | #include "ctree.h" |
40 | #include "disk-io.h" | |
41 | #include "transaction.h" | |
42 | #include "btrfs_inode.h" | |
43 | #include "ioctl.h" | |
44 | #include "print-tree.h" | |
0b86a832 | 45 | #include "volumes.h" |
e6dcd2dc | 46 | #include "ordered-data.h" |
39279cc3 CM |
47 | |
48 | struct btrfs_iget_args { | |
49 | u64 ino; | |
50 | struct btrfs_root *root; | |
51 | }; | |
52 | ||
53 | static struct inode_operations btrfs_dir_inode_operations; | |
54 | static struct inode_operations btrfs_symlink_inode_operations; | |
55 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 56 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
57 | static struct inode_operations btrfs_file_inode_operations; |
58 | static struct address_space_operations btrfs_aops; | |
59 | static struct address_space_operations btrfs_symlink_aops; | |
60 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 61 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
62 | |
63 | static struct kmem_cache *btrfs_inode_cachep; | |
64 | struct kmem_cache *btrfs_trans_handle_cachep; | |
65 | struct kmem_cache *btrfs_transaction_cachep; | |
66 | struct kmem_cache *btrfs_bit_radix_cachep; | |
67 | struct kmem_cache *btrfs_path_cachep; | |
68 | ||
69 | #define S_SHIFT 12 | |
70 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
71 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
72 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
73 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
74 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
75 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
76 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
77 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
78 | }; | |
79 | ||
1832a6d5 CM |
80 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
81 | int for_del) | |
82 | { | |
a2135011 CM |
83 | u64 total; |
84 | u64 used; | |
1832a6d5 | 85 | u64 thresh; |
bcbfce8a | 86 | unsigned long flags; |
1832a6d5 CM |
87 | int ret = 0; |
88 | ||
a2135011 CM |
89 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
90 | total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
91 | used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
1832a6d5 | 92 | if (for_del) |
f9ef6604 | 93 | thresh = total * 90; |
1832a6d5 | 94 | else |
f9ef6604 CM |
95 | thresh = total * 85; |
96 | ||
97 | do_div(thresh, 100); | |
1832a6d5 | 98 | |
1832a6d5 CM |
99 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) |
100 | ret = -ENOSPC; | |
bcbfce8a | 101 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
1832a6d5 CM |
102 | return ret; |
103 | } | |
104 | ||
be20aa9d | 105 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
106 | { |
107 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
108 | struct btrfs_trans_handle *trans; | |
b888db2b | 109 | u64 alloc_hint = 0; |
db94535d | 110 | u64 num_bytes; |
c59f8951 | 111 | u64 cur_alloc_size; |
db94535d | 112 | u64 blocksize = root->sectorsize; |
d1310b2e | 113 | u64 orig_num_bytes; |
be20aa9d | 114 | struct btrfs_key ins; |
e6dcd2dc CM |
115 | struct extent_map *em; |
116 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
117 | int ret = 0; | |
b888db2b | 118 | |
f9295749 | 119 | trans = btrfs_join_transaction(root, 1); |
b888db2b | 120 | BUG_ON(!trans); |
be20aa9d CM |
121 | btrfs_set_trans_block_group(trans, inode); |
122 | ||
db94535d | 123 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 124 | num_bytes = max(blocksize, num_bytes); |
d1310b2e | 125 | orig_num_bytes = num_bytes; |
db94535d | 126 | |
179e29e4 CM |
127 | if (alloc_hint == EXTENT_MAP_INLINE) |
128 | goto out; | |
129 | ||
3b951516 | 130 | BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy)); |
e5a2217e | 131 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
e6dcd2dc | 132 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1); |
e5a2217e | 133 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
3b951516 | 134 | |
c59f8951 CM |
135 | while(num_bytes > 0) { |
136 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
e6dcd2dc CM |
137 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
138 | root->sectorsize, 0, 0, | |
139 | (u64)-1, &ins, 1); | |
c59f8951 CM |
140 | if (ret) { |
141 | WARN_ON(1); | |
142 | goto out; | |
143 | } | |
e6dcd2dc CM |
144 | em = alloc_extent_map(GFP_NOFS); |
145 | em->start = start; | |
146 | em->len = ins.offset; | |
147 | em->block_start = ins.objectid; | |
148 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
e5a2217e | 149 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
7f3c74fb | 150 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
e6dcd2dc CM |
151 | while(1) { |
152 | spin_lock(&em_tree->lock); | |
153 | ret = add_extent_mapping(em_tree, em); | |
154 | spin_unlock(&em_tree->lock); | |
155 | if (ret != -EEXIST) { | |
156 | free_extent_map(em); | |
157 | break; | |
158 | } | |
159 | btrfs_drop_extent_cache(inode, start, | |
160 | start + ins.offset - 1); | |
161 | } | |
e5a2217e | 162 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
e6dcd2dc | 163 | |
98d20f67 | 164 | cur_alloc_size = ins.offset; |
e6dcd2dc CM |
165 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
166 | ins.offset); | |
167 | BUG_ON(ret); | |
3b951516 CM |
168 | if (num_bytes < cur_alloc_size) { |
169 | printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes, | |
170 | cur_alloc_size); | |
171 | break; | |
172 | } | |
c59f8951 CM |
173 | num_bytes -= cur_alloc_size; |
174 | alloc_hint = ins.objectid + ins.offset; | |
175 | start += cur_alloc_size; | |
b888db2b | 176 | } |
b888db2b CM |
177 | out: |
178 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
179 | return ret; |
180 | } | |
181 | ||
182 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
183 | { | |
184 | u64 extent_start; | |
185 | u64 extent_end; | |
186 | u64 bytenr; | |
187 | u64 cow_end; | |
1832a6d5 | 188 | u64 loops = 0; |
c31f8830 | 189 | u64 total_fs_bytes; |
be20aa9d | 190 | struct btrfs_root *root = BTRFS_I(inode)->root; |
a68d5933 | 191 | struct btrfs_block_group_cache *block_group; |
be20aa9d CM |
192 | struct extent_buffer *leaf; |
193 | int found_type; | |
194 | struct btrfs_path *path; | |
195 | struct btrfs_file_extent_item *item; | |
196 | int ret; | |
197 | int err; | |
198 | struct btrfs_key found_key; | |
199 | ||
c31f8830 | 200 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
201 | path = btrfs_alloc_path(); |
202 | BUG_ON(!path); | |
203 | again: | |
204 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
205 | inode->i_ino, start, 0); | |
206 | if (ret < 0) { | |
207 | btrfs_free_path(path); | |
208 | return ret; | |
209 | } | |
210 | ||
211 | cow_end = end; | |
212 | if (ret != 0) { | |
213 | if (path->slots[0] == 0) | |
214 | goto not_found; | |
215 | path->slots[0]--; | |
216 | } | |
217 | ||
218 | leaf = path->nodes[0]; | |
219 | item = btrfs_item_ptr(leaf, path->slots[0], | |
220 | struct btrfs_file_extent_item); | |
221 | ||
222 | /* are we inside the extent that was found? */ | |
223 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
224 | found_type = btrfs_key_type(&found_key); | |
225 | if (found_key.objectid != inode->i_ino || | |
bbaf549e | 226 | found_type != BTRFS_EXTENT_DATA_KEY) |
be20aa9d | 227 | goto not_found; |
be20aa9d CM |
228 | |
229 | found_type = btrfs_file_extent_type(leaf, item); | |
230 | extent_start = found_key.offset; | |
231 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
232 | u64 extent_num_bytes; |
233 | ||
234 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
235 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
236 | err = 0; |
237 | ||
1832a6d5 CM |
238 | if (loops && start != extent_start) |
239 | goto not_found; | |
240 | ||
be20aa9d CM |
241 | if (start < extent_start || start >= extent_end) |
242 | goto not_found; | |
243 | ||
244 | cow_end = min(end, extent_end - 1); | |
245 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
246 | if (bytenr == 0) | |
247 | goto not_found; | |
248 | ||
a68d5933 CM |
249 | if (btrfs_count_snapshots_in_path(root, path, inode->i_ino, |
250 | bytenr) != 1) { | |
251 | goto not_found; | |
252 | } | |
253 | ||
c31f8830 CM |
254 | /* |
255 | * we may be called by the resizer, make sure we're inside | |
256 | * the limits of the FS | |
257 | */ | |
a68d5933 CM |
258 | block_group = btrfs_lookup_block_group(root->fs_info, |
259 | bytenr); | |
260 | if (!block_group || block_group->ro) | |
c31f8830 CM |
261 | goto not_found; |
262 | ||
be20aa9d | 263 | start = extent_end; |
bd09835d | 264 | } else { |
be20aa9d CM |
265 | goto not_found; |
266 | } | |
267 | loop: | |
268 | if (start > end) { | |
269 | btrfs_free_path(path); | |
270 | return 0; | |
271 | } | |
272 | btrfs_release_path(root, path); | |
1832a6d5 | 273 | loops++; |
be20aa9d CM |
274 | goto again; |
275 | ||
276 | not_found: | |
bbaf549e CM |
277 | cow_file_range(inode, start, end); |
278 | start = end + 1; | |
be20aa9d CM |
279 | goto loop; |
280 | } | |
281 | ||
282 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
283 | { | |
284 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
285 | int ret; | |
a2135011 | 286 | |
b98b6767 Y |
287 | if (btrfs_test_opt(root, NODATACOW) || |
288 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
289 | ret = run_delalloc_nocow(inode, start, end); |
290 | else | |
291 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 292 | |
b888db2b CM |
293 | return ret; |
294 | } | |
295 | ||
291d673e | 296 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 297 | unsigned long old, unsigned long bits) |
291d673e | 298 | { |
bcbfce8a | 299 | unsigned long flags; |
b0c68f8b | 300 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 301 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a | 302 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
9069218d | 303 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e | 304 | root->fs_info->delalloc_bytes += end - start + 1; |
bcbfce8a | 305 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
306 | } |
307 | return 0; | |
308 | } | |
309 | ||
310 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 311 | unsigned long old, unsigned long bits) |
291d673e | 312 | { |
b0c68f8b | 313 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 314 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a CM |
315 | unsigned long flags; |
316 | ||
317 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
b0c68f8b CM |
318 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
319 | printk("warning: delalloc account %Lu %Lu\n", | |
320 | end - start + 1, root->fs_info->delalloc_bytes); | |
321 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 322 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
323 | } else { |
324 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 325 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 326 | } |
bcbfce8a | 327 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
328 | } |
329 | return 0; | |
330 | } | |
331 | ||
239b14b3 CM |
332 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
333 | size_t size, struct bio *bio) | |
334 | { | |
335 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
336 | struct btrfs_mapping_tree *map_tree; | |
239b14b3 | 337 | u64 logical = bio->bi_sector << 9; |
239b14b3 CM |
338 | u64 length = 0; |
339 | u64 map_length; | |
239b14b3 CM |
340 | int ret; |
341 | ||
f2d8d74d | 342 | length = bio->bi_size; |
239b14b3 CM |
343 | map_tree = &root->fs_info->mapping_tree; |
344 | map_length = length; | |
cea9e445 | 345 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 346 | &map_length, NULL, 0); |
cea9e445 | 347 | |
239b14b3 | 348 | if (map_length < length + size) { |
239b14b3 CM |
349 | return 1; |
350 | } | |
351 | return 0; | |
352 | } | |
353 | ||
44b8bd7e | 354 | int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
f188591e | 355 | int mirror_num) |
065631f6 | 356 | { |
065631f6 | 357 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 358 | int ret = 0; |
e015640f | 359 | |
3edf7d33 | 360 | ret = btrfs_csum_one_bio(root, inode, bio); |
44b8bd7e | 361 | BUG_ON(ret); |
e015640f | 362 | |
8b712842 | 363 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
44b8bd7e CM |
364 | } |
365 | ||
366 | int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, | |
367 | int mirror_num) | |
368 | { | |
369 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
370 | int ret = 0; | |
371 | ||
e6dcd2dc CM |
372 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); |
373 | BUG_ON(ret); | |
065631f6 | 374 | |
e6dcd2dc | 375 | if (!(rw & (1 << BIO_RW))) { |
0b86a832 CM |
376 | goto mapit; |
377 | } | |
065631f6 | 378 | |
44b8bd7e CM |
379 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
380 | inode, rw, bio, mirror_num, | |
381 | __btrfs_submit_bio_hook); | |
0b86a832 | 382 | mapit: |
8b712842 | 383 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
065631f6 | 384 | } |
6885f308 | 385 | |
ba1da2f4 | 386 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
387 | struct inode *inode, u64 file_offset, |
388 | struct list_head *list) | |
389 | { | |
390 | struct list_head *cur; | |
391 | struct btrfs_ordered_sum *sum; | |
392 | ||
393 | btrfs_set_trans_block_group(trans, inode); | |
ba1da2f4 | 394 | list_for_each(cur, list) { |
e6dcd2dc CM |
395 | sum = list_entry(cur, struct btrfs_ordered_sum, list); |
396 | mutex_lock(&BTRFS_I(inode)->csum_mutex); | |
397 | btrfs_csum_file_blocks(trans, BTRFS_I(inode)->root, | |
398 | inode, sum); | |
399 | mutex_unlock(&BTRFS_I(inode)->csum_mutex); | |
e6dcd2dc CM |
400 | } |
401 | return 0; | |
402 | } | |
403 | ||
247e743c CM |
404 | struct btrfs_writepage_fixup { |
405 | struct page *page; | |
406 | struct btrfs_work work; | |
407 | }; | |
408 | ||
409 | /* see btrfs_writepage_start_hook for details on why this is required */ | |
410 | void btrfs_writepage_fixup_worker(struct btrfs_work *work) | |
411 | { | |
412 | struct btrfs_writepage_fixup *fixup; | |
413 | struct btrfs_ordered_extent *ordered; | |
414 | struct page *page; | |
415 | struct inode *inode; | |
416 | u64 page_start; | |
417 | u64 page_end; | |
418 | ||
419 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
420 | page = fixup->page; | |
421 | ||
422 | lock_page(page); | |
423 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
424 | ClearPageChecked(page); | |
425 | goto out_page; | |
426 | } | |
427 | ||
428 | inode = page->mapping->host; | |
429 | page_start = page_offset(page); | |
430 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
431 | ||
432 | lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); | |
433 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
434 | if (ordered) | |
435 | goto out; | |
436 | ||
437 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, page_end, | |
438 | GFP_NOFS); | |
439 | ClearPageChecked(page); | |
440 | out: | |
441 | unlock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); | |
442 | out_page: | |
443 | unlock_page(page); | |
444 | page_cache_release(page); | |
445 | } | |
446 | ||
447 | /* | |
448 | * There are a few paths in the higher layers of the kernel that directly | |
449 | * set the page dirty bit without asking the filesystem if it is a | |
450 | * good idea. This causes problems because we want to make sure COW | |
451 | * properly happens and the data=ordered rules are followed. | |
452 | * | |
453 | * In our case any range that doesn't have the EXTENT_ORDERED bit set | |
454 | * hasn't been properly setup for IO. We kick off an async process | |
455 | * to fix it up. The async helper will wait for ordered extents, set | |
456 | * the delalloc bit and make it safe to write the page. | |
457 | */ | |
458 | int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) | |
459 | { | |
460 | struct inode *inode = page->mapping->host; | |
461 | struct btrfs_writepage_fixup *fixup; | |
462 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
463 | int ret; | |
464 | ||
465 | ret = test_range_bit(&BTRFS_I(inode)->io_tree, start, end, | |
466 | EXTENT_ORDERED, 0); | |
467 | if (ret) | |
468 | return 0; | |
469 | ||
470 | if (PageChecked(page)) | |
471 | return -EAGAIN; | |
472 | ||
473 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
474 | if (!fixup) | |
475 | return -EAGAIN; | |
476 | printk("queueing worker to fixup page %lu %Lu\n", inode->i_ino, page_offset(page)); | |
477 | SetPageChecked(page); | |
478 | page_cache_get(page); | |
479 | fixup->work.func = btrfs_writepage_fixup_worker; | |
480 | fixup->page = page; | |
481 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); | |
482 | return -EAGAIN; | |
483 | } | |
484 | ||
211f90e6 | 485 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) |
e6dcd2dc | 486 | { |
e6dcd2dc CM |
487 | struct btrfs_root *root = BTRFS_I(inode)->root; |
488 | struct btrfs_trans_handle *trans; | |
489 | struct btrfs_ordered_extent *ordered_extent; | |
490 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
7f3c74fb CM |
491 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
492 | struct extent_map *em; | |
e6dcd2dc | 493 | u64 alloc_hint = 0; |
e5a2217e CM |
494 | u64 clear_start; |
495 | u64 clear_end; | |
e6dcd2dc CM |
496 | struct list_head list; |
497 | struct btrfs_key ins; | |
498 | int ret; | |
499 | ||
500 | ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1); | |
ba1da2f4 | 501 | if (!ret) |
e6dcd2dc | 502 | return 0; |
e6dcd2dc | 503 | |
f9295749 | 504 | trans = btrfs_join_transaction(root, 1); |
e6dcd2dc CM |
505 | |
506 | ordered_extent = btrfs_lookup_ordered_extent(inode, start); | |
507 | BUG_ON(!ordered_extent); | |
508 | ||
509 | lock_extent(io_tree, ordered_extent->file_offset, | |
510 | ordered_extent->file_offset + ordered_extent->len - 1, | |
511 | GFP_NOFS); | |
512 | ||
513 | INIT_LIST_HEAD(&list); | |
514 | ||
515 | ins.objectid = ordered_extent->start; | |
516 | ins.offset = ordered_extent->len; | |
517 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
e5a2217e | 518 | |
e6dcd2dc CM |
519 | ret = btrfs_alloc_reserved_extent(trans, root, root->root_key.objectid, |
520 | trans->transid, inode->i_ino, | |
521 | ordered_extent->file_offset, &ins); | |
522 | BUG_ON(ret); | |
ee6e6504 CM |
523 | |
524 | mutex_lock(&BTRFS_I(inode)->extent_mutex); | |
e5a2217e | 525 | |
e6dcd2dc CM |
526 | ret = btrfs_drop_extents(trans, root, inode, |
527 | ordered_extent->file_offset, | |
528 | ordered_extent->file_offset + | |
529 | ordered_extent->len, | |
530 | ordered_extent->file_offset, &alloc_hint); | |
531 | BUG_ON(ret); | |
532 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
533 | ordered_extent->file_offset, | |
534 | ordered_extent->start, | |
535 | ordered_extent->len, | |
536 | ordered_extent->len, 0); | |
537 | BUG_ON(ret); | |
7f3c74fb | 538 | |
7f3c74fb | 539 | spin_lock(&em_tree->lock); |
e5a2217e CM |
540 | clear_start = ordered_extent->file_offset; |
541 | clear_end = ordered_extent->file_offset + ordered_extent->len; | |
542 | while(clear_start < clear_end) { | |
543 | em = lookup_extent_mapping(em_tree, clear_start, | |
544 | clear_end - clear_start); | |
545 | if (em) { | |
546 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); | |
547 | clear_start = em->start + em->len; | |
548 | free_extent_map(em); | |
549 | } else { | |
550 | break; | |
551 | } | |
7f3c74fb CM |
552 | } |
553 | spin_unlock(&em_tree->lock); | |
554 | ||
e6dcd2dc CM |
555 | btrfs_drop_extent_cache(inode, ordered_extent->file_offset, |
556 | ordered_extent->file_offset + | |
557 | ordered_extent->len - 1); | |
ee6e6504 CM |
558 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
559 | ||
e6dcd2dc CM |
560 | inode->i_blocks += ordered_extent->len >> 9; |
561 | unlock_extent(io_tree, ordered_extent->file_offset, | |
562 | ordered_extent->file_offset + ordered_extent->len - 1, | |
563 | GFP_NOFS); | |
564 | add_pending_csums(trans, inode, ordered_extent->file_offset, | |
565 | &ordered_extent->list); | |
566 | ||
dbe674a9 | 567 | btrfs_ordered_update_i_size(inode, ordered_extent); |
e6dcd2dc | 568 | btrfs_remove_ordered_extent(inode, ordered_extent); |
7f3c74fb | 569 | |
e6dcd2dc CM |
570 | /* once for us */ |
571 | btrfs_put_ordered_extent(ordered_extent); | |
572 | /* once for the tree */ | |
573 | btrfs_put_ordered_extent(ordered_extent); | |
574 | ||
575 | btrfs_update_inode(trans, root, inode); | |
576 | btrfs_end_transaction(trans, root); | |
577 | return 0; | |
578 | } | |
579 | ||
211f90e6 CM |
580 | int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
581 | struct extent_state *state, int uptodate) | |
582 | { | |
583 | return btrfs_finish_ordered_io(page->mapping->host, start, end); | |
584 | } | |
585 | ||
07157aac CM |
586 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) |
587 | { | |
588 | int ret = 0; | |
589 | struct inode *inode = page->mapping->host; | |
590 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 591 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
592 | struct btrfs_csum_item *item; |
593 | struct btrfs_path *path = NULL; | |
ff79f819 | 594 | u32 csum; |
699122f5 | 595 | |
b98b6767 Y |
596 | if (btrfs_test_opt(root, NODATASUM) || |
597 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 598 | return 0; |
699122f5 | 599 | |
07157aac CM |
600 | path = btrfs_alloc_path(); |
601 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
602 | if (IS_ERR(item)) { | |
ba1da2f4 CM |
603 | /* |
604 | * It is possible there is an ordered extent that has | |
605 | * not yet finished for this range in the file. If so, | |
606 | * that extent will have a csum cached, and it will insert | |
607 | * the sum after all the blocks in the extent are fully | |
608 | * on disk. So, look for an ordered extent and use the | |
609 | * sum if found. | |
610 | */ | |
611 | ret = btrfs_find_ordered_sum(inode, start, &csum); | |
612 | if (ret == 0) | |
613 | goto found; | |
614 | ||
07157aac CM |
615 | ret = PTR_ERR(item); |
616 | /* a csum that isn't present is a preallocated region. */ | |
617 | if (ret == -ENOENT || ret == -EFBIG) | |
618 | ret = 0; | |
ff79f819 | 619 | csum = 0; |
e6dcd2dc CM |
620 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, |
621 | start); | |
07157aac CM |
622 | goto out; |
623 | } | |
ff79f819 CM |
624 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
625 | BTRFS_CRC32_SIZE); | |
ba1da2f4 | 626 | found: |
d1310b2e | 627 | set_state_private(io_tree, start, csum); |
07157aac CM |
628 | out: |
629 | if (path) | |
630 | btrfs_free_path(path); | |
07157aac CM |
631 | return ret; |
632 | } | |
633 | ||
7e38326f CM |
634 | struct io_failure_record { |
635 | struct page *page; | |
636 | u64 start; | |
637 | u64 len; | |
638 | u64 logical; | |
639 | int last_mirror; | |
640 | }; | |
641 | ||
1259ab75 CM |
642 | int btrfs_io_failed_hook(struct bio *failed_bio, |
643 | struct page *page, u64 start, u64 end, | |
644 | struct extent_state *state) | |
7e38326f CM |
645 | { |
646 | struct io_failure_record *failrec = NULL; | |
647 | u64 private; | |
648 | struct extent_map *em; | |
649 | struct inode *inode = page->mapping->host; | |
650 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
3b951516 | 651 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
7e38326f CM |
652 | struct bio *bio; |
653 | int num_copies; | |
654 | int ret; | |
1259ab75 | 655 | int rw; |
7e38326f CM |
656 | u64 logical; |
657 | ||
658 | ret = get_state_private(failure_tree, start, &private); | |
659 | if (ret) { | |
7e38326f CM |
660 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); |
661 | if (!failrec) | |
662 | return -ENOMEM; | |
663 | failrec->start = start; | |
664 | failrec->len = end - start + 1; | |
665 | failrec->last_mirror = 0; | |
666 | ||
3b951516 CM |
667 | spin_lock(&em_tree->lock); |
668 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
669 | if (em->start > start || em->start + em->len < start) { | |
670 | free_extent_map(em); | |
671 | em = NULL; | |
672 | } | |
673 | spin_unlock(&em_tree->lock); | |
7e38326f CM |
674 | |
675 | if (!em || IS_ERR(em)) { | |
676 | kfree(failrec); | |
677 | return -EIO; | |
678 | } | |
679 | logical = start - em->start; | |
680 | logical = em->block_start + logical; | |
681 | failrec->logical = logical; | |
682 | free_extent_map(em); | |
683 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | | |
684 | EXTENT_DIRTY, GFP_NOFS); | |
587f7704 CM |
685 | set_state_private(failure_tree, start, |
686 | (u64)(unsigned long)failrec); | |
7e38326f | 687 | } else { |
587f7704 | 688 | failrec = (struct io_failure_record *)(unsigned long)private; |
7e38326f CM |
689 | } |
690 | num_copies = btrfs_num_copies( | |
691 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
692 | failrec->logical, failrec->len); | |
693 | failrec->last_mirror++; | |
694 | if (!state) { | |
695 | spin_lock_irq(&BTRFS_I(inode)->io_tree.lock); | |
696 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
697 | failrec->start, | |
698 | EXTENT_LOCKED); | |
699 | if (state && state->start != failrec->start) | |
700 | state = NULL; | |
701 | spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock); | |
702 | } | |
703 | if (!state || failrec->last_mirror > num_copies) { | |
704 | set_state_private(failure_tree, failrec->start, 0); | |
705 | clear_extent_bits(failure_tree, failrec->start, | |
706 | failrec->start + failrec->len - 1, | |
707 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
708 | kfree(failrec); | |
709 | return -EIO; | |
710 | } | |
711 | bio = bio_alloc(GFP_NOFS, 1); | |
712 | bio->bi_private = state; | |
713 | bio->bi_end_io = failed_bio->bi_end_io; | |
714 | bio->bi_sector = failrec->logical >> 9; | |
715 | bio->bi_bdev = failed_bio->bi_bdev; | |
e1c4b745 | 716 | bio->bi_size = 0; |
7e38326f | 717 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
1259ab75 CM |
718 | if (failed_bio->bi_rw & (1 << BIO_RW)) |
719 | rw = WRITE; | |
720 | else | |
721 | rw = READ; | |
722 | ||
723 | BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio, | |
724 | failrec->last_mirror); | |
725 | return 0; | |
726 | } | |
727 | ||
728 | int btrfs_clean_io_failures(struct inode *inode, u64 start) | |
729 | { | |
730 | u64 private; | |
731 | u64 private_failure; | |
732 | struct io_failure_record *failure; | |
733 | int ret; | |
734 | ||
735 | private = 0; | |
736 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
737 | (u64)-1, 1, EXTENT_DIRTY)) { | |
738 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, | |
739 | start, &private_failure); | |
740 | if (ret == 0) { | |
741 | failure = (struct io_failure_record *)(unsigned long) | |
742 | private_failure; | |
743 | set_state_private(&BTRFS_I(inode)->io_failure_tree, | |
744 | failure->start, 0); | |
745 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, | |
746 | failure->start, | |
747 | failure->start + failure->len - 1, | |
748 | EXTENT_DIRTY | EXTENT_LOCKED, | |
749 | GFP_NOFS); | |
750 | kfree(failure); | |
751 | } | |
752 | } | |
7e38326f CM |
753 | return 0; |
754 | } | |
755 | ||
70dec807 CM |
756 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
757 | struct extent_state *state) | |
07157aac | 758 | { |
35ebb934 | 759 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 760 | struct inode *inode = page->mapping->host; |
d1310b2e | 761 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 762 | char *kaddr; |
aadfeb6e | 763 | u64 private = ~(u32)0; |
07157aac | 764 | int ret; |
ff79f819 CM |
765 | struct btrfs_root *root = BTRFS_I(inode)->root; |
766 | u32 csum = ~(u32)0; | |
bbf0d006 | 767 | unsigned long flags; |
d1310b2e | 768 | |
b98b6767 Y |
769 | if (btrfs_test_opt(root, NODATASUM) || |
770 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 771 | return 0; |
c2e639f0 | 772 | if (state && state->start == start) { |
70dec807 CM |
773 | private = state->private; |
774 | ret = 0; | |
775 | } else { | |
776 | ret = get_state_private(io_tree, start, &private); | |
777 | } | |
bbf0d006 | 778 | local_irq_save(flags); |
07157aac CM |
779 | kaddr = kmap_atomic(page, KM_IRQ0); |
780 | if (ret) { | |
781 | goto zeroit; | |
782 | } | |
ff79f819 CM |
783 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
784 | btrfs_csum_final(csum, (char *)&csum); | |
785 | if (csum != private) { | |
07157aac CM |
786 | goto zeroit; |
787 | } | |
788 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 789 | local_irq_restore(flags); |
7e38326f CM |
790 | |
791 | /* if the io failure tree for this inode is non-empty, | |
792 | * check to see if we've recovered from a failed IO | |
793 | */ | |
1259ab75 | 794 | btrfs_clean_io_failures(inode, start); |
07157aac CM |
795 | return 0; |
796 | ||
797 | zeroit: | |
aadfeb6e CM |
798 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
799 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
800 | private); | |
db94535d CM |
801 | memset(kaddr + offset, 1, end - start + 1); |
802 | flush_dcache_page(page); | |
07157aac | 803 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 804 | local_irq_restore(flags); |
3b951516 CM |
805 | if (private == 0) |
806 | return 0; | |
7e38326f | 807 | return -EIO; |
07157aac | 808 | } |
b888db2b | 809 | |
39279cc3 CM |
810 | void btrfs_read_locked_inode(struct inode *inode) |
811 | { | |
812 | struct btrfs_path *path; | |
5f39d397 | 813 | struct extent_buffer *leaf; |
39279cc3 | 814 | struct btrfs_inode_item *inode_item; |
0b86a832 | 815 | struct btrfs_timespec *tspec; |
39279cc3 CM |
816 | struct btrfs_root *root = BTRFS_I(inode)->root; |
817 | struct btrfs_key location; | |
818 | u64 alloc_group_block; | |
618e21d5 | 819 | u32 rdev; |
39279cc3 CM |
820 | int ret; |
821 | ||
822 | path = btrfs_alloc_path(); | |
823 | BUG_ON(!path); | |
39279cc3 | 824 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 825 | |
39279cc3 | 826 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 827 | if (ret) |
39279cc3 | 828 | goto make_bad; |
39279cc3 | 829 | |
5f39d397 CM |
830 | leaf = path->nodes[0]; |
831 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
832 | struct btrfs_inode_item); | |
833 | ||
834 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
835 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
836 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
837 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
dbe674a9 | 838 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 CM |
839 | |
840 | tspec = btrfs_inode_atime(inode_item); | |
841 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
842 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
843 | ||
844 | tspec = btrfs_inode_mtime(inode_item); | |
845 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
846 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
847 | ||
848 | tspec = btrfs_inode_ctime(inode_item); | |
849 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
850 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
851 | ||
852 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
853 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 854 | inode->i_rdev = 0; |
5f39d397 CM |
855 | rdev = btrfs_inode_rdev(leaf, inode_item); |
856 | ||
857 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
858 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
859 | alloc_group_block); | |
b98b6767 | 860 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
861 | if (!BTRFS_I(inode)->block_group) { |
862 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
0b86a832 CM |
863 | NULL, 0, |
864 | BTRFS_BLOCK_GROUP_METADATA, 0); | |
e52ec0eb | 865 | } |
39279cc3 CM |
866 | btrfs_free_path(path); |
867 | inode_item = NULL; | |
868 | ||
39279cc3 | 869 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
870 | case S_IFREG: |
871 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 872 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 873 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
874 | inode->i_fop = &btrfs_file_operations; |
875 | inode->i_op = &btrfs_file_inode_operations; | |
876 | break; | |
877 | case S_IFDIR: | |
878 | inode->i_fop = &btrfs_dir_file_operations; | |
879 | if (root == root->fs_info->tree_root) | |
880 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
881 | else | |
882 | inode->i_op = &btrfs_dir_inode_operations; | |
883 | break; | |
884 | case S_IFLNK: | |
885 | inode->i_op = &btrfs_symlink_inode_operations; | |
886 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 887 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 888 | break; |
618e21d5 JB |
889 | default: |
890 | init_special_inode(inode, inode->i_mode, rdev); | |
891 | break; | |
39279cc3 CM |
892 | } |
893 | return; | |
894 | ||
895 | make_bad: | |
39279cc3 | 896 | btrfs_free_path(path); |
39279cc3 CM |
897 | make_bad_inode(inode); |
898 | } | |
899 | ||
5f39d397 CM |
900 | static void fill_inode_item(struct extent_buffer *leaf, |
901 | struct btrfs_inode_item *item, | |
39279cc3 CM |
902 | struct inode *inode) |
903 | { | |
5f39d397 CM |
904 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
905 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
dbe674a9 | 906 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
5f39d397 CM |
907 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
908 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
909 | ||
910 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
911 | inode->i_atime.tv_sec); | |
912 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
913 | inode->i_atime.tv_nsec); | |
914 | ||
915 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
916 | inode->i_mtime.tv_sec); | |
917 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
918 | inode->i_mtime.tv_nsec); | |
919 | ||
920 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
921 | inode->i_ctime.tv_sec); | |
922 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
923 | inode->i_ctime.tv_nsec); | |
924 | ||
925 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
926 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
927 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 928 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 929 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
930 | BTRFS_I(inode)->block_group->key.objectid); |
931 | } | |
932 | ||
ba1da2f4 | 933 | int noinline btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
934 | struct btrfs_root *root, |
935 | struct inode *inode) | |
936 | { | |
937 | struct btrfs_inode_item *inode_item; | |
938 | struct btrfs_path *path; | |
5f39d397 | 939 | struct extent_buffer *leaf; |
39279cc3 CM |
940 | int ret; |
941 | ||
942 | path = btrfs_alloc_path(); | |
943 | BUG_ON(!path); | |
39279cc3 CM |
944 | ret = btrfs_lookup_inode(trans, root, path, |
945 | &BTRFS_I(inode)->location, 1); | |
946 | if (ret) { | |
947 | if (ret > 0) | |
948 | ret = -ENOENT; | |
949 | goto failed; | |
950 | } | |
951 | ||
5f39d397 CM |
952 | leaf = path->nodes[0]; |
953 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
954 | struct btrfs_inode_item); |
955 | ||
5f39d397 CM |
956 | fill_inode_item(leaf, inode_item, inode); |
957 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 958 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
959 | ret = 0; |
960 | failed: | |
39279cc3 CM |
961 | btrfs_free_path(path); |
962 | return ret; | |
963 | } | |
964 | ||
965 | ||
966 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
967 | struct btrfs_root *root, | |
968 | struct inode *dir, | |
969 | struct dentry *dentry) | |
970 | { | |
971 | struct btrfs_path *path; | |
972 | const char *name = dentry->d_name.name; | |
973 | int name_len = dentry->d_name.len; | |
974 | int ret = 0; | |
5f39d397 | 975 | struct extent_buffer *leaf; |
39279cc3 | 976 | struct btrfs_dir_item *di; |
5f39d397 | 977 | struct btrfs_key key; |
39279cc3 CM |
978 | |
979 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
980 | if (!path) { |
981 | ret = -ENOMEM; | |
982 | goto err; | |
983 | } | |
984 | ||
39279cc3 CM |
985 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
986 | name, name_len, -1); | |
987 | if (IS_ERR(di)) { | |
988 | ret = PTR_ERR(di); | |
989 | goto err; | |
990 | } | |
991 | if (!di) { | |
992 | ret = -ENOENT; | |
993 | goto err; | |
994 | } | |
5f39d397 CM |
995 | leaf = path->nodes[0]; |
996 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 997 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
998 | if (ret) |
999 | goto err; | |
39279cc3 CM |
1000 | btrfs_release_path(root, path); |
1001 | ||
1002 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 1003 | key.objectid, name, name_len, -1); |
39279cc3 CM |
1004 | if (IS_ERR(di)) { |
1005 | ret = PTR_ERR(di); | |
1006 | goto err; | |
1007 | } | |
1008 | if (!di) { | |
1009 | ret = -ENOENT; | |
1010 | goto err; | |
1011 | } | |
1012 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
925baedd | 1013 | btrfs_release_path(root, path); |
39279cc3 CM |
1014 | |
1015 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
1016 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
1017 | dentry->d_inode->i_ino, | |
1018 | dentry->d_parent->d_inode->i_ino); | |
1019 | if (ret) { | |
1020 | printk("failed to delete reference to %.*s, " | |
1021 | "inode %lu parent %lu\n", name_len, name, | |
1022 | dentry->d_inode->i_ino, | |
1023 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 1024 | } |
39279cc3 CM |
1025 | err: |
1026 | btrfs_free_path(path); | |
1027 | if (!ret) { | |
dbe674a9 | 1028 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); |
79c44584 | 1029 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 1030 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
1031 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1032 | dentry->d_inode->i_nlink--; | |
1033 | #else | |
39279cc3 | 1034 | drop_nlink(dentry->d_inode); |
6da6abae | 1035 | #endif |
54aa1f4d | 1036 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
1037 | dir->i_sb->s_dirt = 1; |
1038 | } | |
1039 | return ret; | |
1040 | } | |
1041 | ||
1042 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
1043 | { | |
1044 | struct btrfs_root *root; | |
1045 | struct btrfs_trans_handle *trans; | |
1046 | int ret; | |
1832a6d5 | 1047 | unsigned long nr = 0; |
39279cc3 CM |
1048 | |
1049 | root = BTRFS_I(dir)->root; | |
1832a6d5 CM |
1050 | |
1051 | ret = btrfs_check_free_space(root, 1, 1); | |
1052 | if (ret) | |
1053 | goto fail; | |
1054 | ||
39279cc3 | 1055 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1056 | |
39279cc3 CM |
1057 | btrfs_set_trans_block_group(trans, dir); |
1058 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 1059 | nr = trans->blocks_used; |
5f39d397 | 1060 | |
89ce8a63 | 1061 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 1062 | fail: |
d3c2fdcf | 1063 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1064 | return ret; |
1065 | } | |
1066 | ||
1067 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
1068 | { | |
1069 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 1070 | int err = 0; |
39279cc3 CM |
1071 | int ret; |
1072 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 1073 | struct btrfs_trans_handle *trans; |
1832a6d5 | 1074 | unsigned long nr = 0; |
39279cc3 | 1075 | |
925baedd | 1076 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) { |
134d4512 | 1077 | return -ENOTEMPTY; |
925baedd | 1078 | } |
134d4512 | 1079 | |
1832a6d5 CM |
1080 | ret = btrfs_check_free_space(root, 1, 1); |
1081 | if (ret) | |
1082 | goto fail; | |
1083 | ||
39279cc3 CM |
1084 | trans = btrfs_start_transaction(root, 1); |
1085 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
1086 | |
1087 | /* now the directory is empty */ | |
1088 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
1089 | if (!err) { | |
dbe674a9 | 1090 | btrfs_i_size_write(inode, 0); |
39279cc3 | 1091 | } |
3954401f | 1092 | |
d3c2fdcf | 1093 | nr = trans->blocks_used; |
89ce8a63 | 1094 | ret = btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 1095 | fail: |
d3c2fdcf | 1096 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 1097 | |
39279cc3 CM |
1098 | if (ret && !err) |
1099 | err = ret; | |
1100 | return err; | |
1101 | } | |
1102 | ||
39279cc3 CM |
1103 | /* |
1104 | * this can truncate away extent items, csum items and directory items. | |
1105 | * It starts at a high offset and removes keys until it can't find | |
1106 | * any higher than i_size. | |
1107 | * | |
1108 | * csum items that cross the new i_size are truncated to the new size | |
1109 | * as well. | |
1110 | */ | |
1111 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
1112 | struct btrfs_root *root, | |
85e21bac CM |
1113 | struct inode *inode, |
1114 | u32 min_type) | |
39279cc3 CM |
1115 | { |
1116 | int ret; | |
1117 | struct btrfs_path *path; | |
1118 | struct btrfs_key key; | |
5f39d397 | 1119 | struct btrfs_key found_key; |
39279cc3 | 1120 | u32 found_type; |
5f39d397 | 1121 | struct extent_buffer *leaf; |
39279cc3 CM |
1122 | struct btrfs_file_extent_item *fi; |
1123 | u64 extent_start = 0; | |
db94535d | 1124 | u64 extent_num_bytes = 0; |
39279cc3 | 1125 | u64 item_end = 0; |
7bb86316 | 1126 | u64 root_gen = 0; |
d8d5f3e1 | 1127 | u64 root_owner = 0; |
39279cc3 CM |
1128 | int found_extent; |
1129 | int del_item; | |
85e21bac CM |
1130 | int pending_del_nr = 0; |
1131 | int pending_del_slot = 0; | |
179e29e4 | 1132 | int extent_type = -1; |
3b951516 | 1133 | u64 mask = root->sectorsize - 1; |
39279cc3 | 1134 | |
3b951516 | 1135 | btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1); |
39279cc3 | 1136 | path = btrfs_alloc_path(); |
3c69faec | 1137 | path->reada = -1; |
39279cc3 | 1138 | BUG_ON(!path); |
5f39d397 | 1139 | |
39279cc3 CM |
1140 | /* FIXME, add redo link to tree so we don't leak on crash */ |
1141 | key.objectid = inode->i_ino; | |
1142 | key.offset = (u64)-1; | |
5f39d397 CM |
1143 | key.type = (u8)-1; |
1144 | ||
85e21bac CM |
1145 | btrfs_init_path(path); |
1146 | search_again: | |
1147 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1148 | if (ret < 0) { | |
1149 | goto error; | |
1150 | } | |
1151 | if (ret > 0) { | |
1152 | BUG_ON(path->slots[0] == 0); | |
1153 | path->slots[0]--; | |
1154 | } | |
1155 | ||
39279cc3 | 1156 | while(1) { |
39279cc3 | 1157 | fi = NULL; |
5f39d397 CM |
1158 | leaf = path->nodes[0]; |
1159 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1160 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 1161 | |
5f39d397 | 1162 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 1163 | break; |
5f39d397 | 1164 | |
85e21bac | 1165 | if (found_type < min_type) |
39279cc3 CM |
1166 | break; |
1167 | ||
5f39d397 | 1168 | item_end = found_key.offset; |
39279cc3 | 1169 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 1170 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 1171 | struct btrfs_file_extent_item); |
179e29e4 CM |
1172 | extent_type = btrfs_file_extent_type(leaf, fi); |
1173 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1174 | item_end += |
db94535d | 1175 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
1176 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1177 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
1178 | path->slots[0]); | |
1179 | item_end += btrfs_file_extent_inline_len(leaf, | |
1180 | item); | |
39279cc3 | 1181 | } |
008630c1 | 1182 | item_end--; |
39279cc3 CM |
1183 | } |
1184 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
1185 | ret = btrfs_csum_truncate(trans, root, path, | |
1186 | inode->i_size); | |
1187 | BUG_ON(ret); | |
1188 | } | |
008630c1 | 1189 | if (item_end < inode->i_size) { |
b888db2b CM |
1190 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
1191 | found_type = BTRFS_INODE_ITEM_KEY; | |
1192 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
1193 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
1194 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
1195 | found_type = BTRFS_XATTR_ITEM_KEY; | |
1196 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
1197 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
1198 | } else if (found_type) { |
1199 | found_type--; | |
1200 | } else { | |
1201 | break; | |
39279cc3 | 1202 | } |
a61721d5 | 1203 | btrfs_set_key_type(&key, found_type); |
85e21bac | 1204 | goto next; |
39279cc3 | 1205 | } |
5f39d397 | 1206 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
1207 | del_item = 1; |
1208 | else | |
1209 | del_item = 0; | |
1210 | found_extent = 0; | |
1211 | ||
1212 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
1213 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
1214 | goto delete; | |
1215 | ||
1216 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 1217 | u64 num_dec; |
db94535d | 1218 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 1219 | if (!del_item) { |
db94535d CM |
1220 | u64 orig_num_bytes = |
1221 | btrfs_file_extent_num_bytes(leaf, fi); | |
1222 | extent_num_bytes = inode->i_size - | |
5f39d397 | 1223 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
1224 | extent_num_bytes = extent_num_bytes & |
1225 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
1226 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1227 | extent_num_bytes); | |
1228 | num_dec = (orig_num_bytes - | |
9069218d CM |
1229 | extent_num_bytes); |
1230 | if (extent_start != 0) | |
1231 | dec_i_blocks(inode, num_dec); | |
5f39d397 | 1232 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 1233 | } else { |
db94535d CM |
1234 | extent_num_bytes = |
1235 | btrfs_file_extent_disk_num_bytes(leaf, | |
1236 | fi); | |
39279cc3 | 1237 | /* FIXME blocksize != 4096 */ |
9069218d | 1238 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
1239 | if (extent_start != 0) { |
1240 | found_extent = 1; | |
9069218d | 1241 | dec_i_blocks(inode, num_dec); |
39279cc3 | 1242 | } |
d8d5f3e1 CM |
1243 | root_gen = btrfs_header_generation(leaf); |
1244 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 1245 | } |
9069218d CM |
1246 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1247 | if (!del_item) { | |
1248 | u32 newsize = inode->i_size - found_key.offset; | |
1249 | dec_i_blocks(inode, item_end + 1 - | |
1250 | found_key.offset - newsize); | |
1251 | newsize = | |
1252 | btrfs_file_extent_calc_inline_size(newsize); | |
1253 | ret = btrfs_truncate_item(trans, root, path, | |
1254 | newsize, 1); | |
1255 | BUG_ON(ret); | |
1256 | } else { | |
1257 | dec_i_blocks(inode, item_end + 1 - | |
1258 | found_key.offset); | |
1259 | } | |
39279cc3 | 1260 | } |
179e29e4 | 1261 | delete: |
39279cc3 | 1262 | if (del_item) { |
85e21bac CM |
1263 | if (!pending_del_nr) { |
1264 | /* no pending yet, add ourselves */ | |
1265 | pending_del_slot = path->slots[0]; | |
1266 | pending_del_nr = 1; | |
1267 | } else if (pending_del_nr && | |
1268 | path->slots[0] + 1 == pending_del_slot) { | |
1269 | /* hop on the pending chunk */ | |
1270 | pending_del_nr++; | |
1271 | pending_del_slot = path->slots[0]; | |
1272 | } else { | |
1273 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
1274 | } | |
39279cc3 CM |
1275 | } else { |
1276 | break; | |
1277 | } | |
39279cc3 CM |
1278 | if (found_extent) { |
1279 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 1280 | extent_num_bytes, |
d8d5f3e1 | 1281 | root_owner, |
7bb86316 CM |
1282 | root_gen, inode->i_ino, |
1283 | found_key.offset, 0); | |
39279cc3 CM |
1284 | BUG_ON(ret); |
1285 | } | |
85e21bac CM |
1286 | next: |
1287 | if (path->slots[0] == 0) { | |
1288 | if (pending_del_nr) | |
1289 | goto del_pending; | |
1290 | btrfs_release_path(root, path); | |
1291 | goto search_again; | |
1292 | } | |
1293 | ||
1294 | path->slots[0]--; | |
1295 | if (pending_del_nr && | |
1296 | path->slots[0] + 1 != pending_del_slot) { | |
1297 | struct btrfs_key debug; | |
1298 | del_pending: | |
1299 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
1300 | pending_del_slot); | |
1301 | ret = btrfs_del_items(trans, root, path, | |
1302 | pending_del_slot, | |
1303 | pending_del_nr); | |
1304 | BUG_ON(ret); | |
1305 | pending_del_nr = 0; | |
1306 | btrfs_release_path(root, path); | |
1307 | goto search_again; | |
1308 | } | |
39279cc3 CM |
1309 | } |
1310 | ret = 0; | |
1311 | error: | |
85e21bac CM |
1312 | if (pending_del_nr) { |
1313 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
1314 | pending_del_nr); | |
1315 | } | |
39279cc3 CM |
1316 | btrfs_free_path(path); |
1317 | inode->i_sb->s_dirt = 1; | |
1318 | return ret; | |
1319 | } | |
1320 | ||
1321 | /* | |
1322 | * taken from block_truncate_page, but does cow as it zeros out | |
1323 | * any bytes left in the last page in the file. | |
1324 | */ | |
1325 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
1326 | { | |
1327 | struct inode *inode = mapping->host; | |
db94535d | 1328 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
1329 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
1330 | struct btrfs_ordered_extent *ordered; | |
1331 | char *kaddr; | |
db94535d | 1332 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
1333 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
1334 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
1335 | struct page *page; | |
39279cc3 | 1336 | int ret = 0; |
a52d9a80 | 1337 | u64 page_start; |
e6dcd2dc | 1338 | u64 page_end; |
39279cc3 CM |
1339 | |
1340 | if ((offset & (blocksize - 1)) == 0) | |
1341 | goto out; | |
1342 | ||
1343 | ret = -ENOMEM; | |
211c17f5 | 1344 | again: |
39279cc3 CM |
1345 | page = grab_cache_page(mapping, index); |
1346 | if (!page) | |
1347 | goto out; | |
e6dcd2dc CM |
1348 | |
1349 | page_start = page_offset(page); | |
1350 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1351 | ||
39279cc3 | 1352 | if (!PageUptodate(page)) { |
9ebefb18 | 1353 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 1354 | lock_page(page); |
211c17f5 CM |
1355 | if (page->mapping != mapping) { |
1356 | unlock_page(page); | |
1357 | page_cache_release(page); | |
1358 | goto again; | |
1359 | } | |
39279cc3 CM |
1360 | if (!PageUptodate(page)) { |
1361 | ret = -EIO; | |
1362 | goto out; | |
1363 | } | |
1364 | } | |
211c17f5 | 1365 | wait_on_page_writeback(page); |
e6dcd2dc CM |
1366 | |
1367 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
1368 | set_page_extent_mapped(page); | |
1369 | ||
1370 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
1371 | if (ordered) { | |
1372 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
1373 | unlock_page(page); | |
1374 | page_cache_release(page); | |
eb84ae03 | 1375 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
1376 | btrfs_put_ordered_extent(ordered); |
1377 | goto again; | |
1378 | } | |
1379 | ||
1380 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, | |
1381 | page_end, GFP_NOFS); | |
1382 | ret = 0; | |
1383 | if (offset != PAGE_CACHE_SIZE) { | |
1384 | kaddr = kmap(page); | |
1385 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1386 | flush_dcache_page(page); | |
1387 | kunmap(page); | |
1388 | } | |
247e743c | 1389 | ClearPageChecked(page); |
e6dcd2dc CM |
1390 | set_page_dirty(page); |
1391 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
39279cc3 | 1392 | |
39279cc3 CM |
1393 | unlock_page(page); |
1394 | page_cache_release(page); | |
1395 | out: | |
1396 | return ret; | |
1397 | } | |
1398 | ||
1399 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1400 | { | |
1401 | struct inode *inode = dentry->d_inode; | |
1402 | int err; | |
1403 | ||
1404 | err = inode_change_ok(inode, attr); | |
1405 | if (err) | |
1406 | return err; | |
1407 | ||
1408 | if (S_ISREG(inode->i_mode) && | |
1409 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1410 | struct btrfs_trans_handle *trans; | |
1411 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1412 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1413 | |
5f39d397 | 1414 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1415 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1416 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1417 | u64 hole_size; |
179e29e4 | 1418 | u64 alloc_hint = 0; |
39279cc3 | 1419 | |
1b0f7c29 | 1420 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1421 | goto out; |
1422 | ||
1832a6d5 | 1423 | err = btrfs_check_free_space(root, 1, 0); |
1832a6d5 CM |
1424 | if (err) |
1425 | goto fail; | |
1426 | ||
39279cc3 CM |
1427 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1428 | ||
5f56406a | 1429 | hole_size = block_end - hole_start; |
e6dcd2dc CM |
1430 | btrfs_wait_ordered_range(inode, hole_start, hole_size); |
1431 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); | |
39279cc3 | 1432 | |
39279cc3 CM |
1433 | trans = btrfs_start_transaction(root, 1); |
1434 | btrfs_set_trans_block_group(trans, inode); | |
ee6e6504 | 1435 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
2bf5a725 | 1436 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1437 | hole_start, block_end, hole_start, |
3326d1b0 | 1438 | &alloc_hint); |
2bf5a725 | 1439 | |
179e29e4 CM |
1440 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1441 | err = btrfs_insert_file_extent(trans, root, | |
1442 | inode->i_ino, | |
5f56406a | 1443 | hole_start, 0, 0, |
f2eb0a24 | 1444 | hole_size, 0); |
d1310b2e | 1445 | btrfs_drop_extent_cache(inode, hole_start, |
3b951516 | 1446 | (u64)-1); |
5f56406a | 1447 | btrfs_check_file(root, inode); |
179e29e4 | 1448 | } |
ee6e6504 | 1449 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
39279cc3 | 1450 | btrfs_end_transaction(trans, root); |
1b0f7c29 | 1451 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1452 | if (err) |
1453 | return err; | |
39279cc3 CM |
1454 | } |
1455 | out: | |
1456 | err = inode_setattr(inode, attr); | |
1832a6d5 | 1457 | fail: |
39279cc3 CM |
1458 | return err; |
1459 | } | |
61295eb8 | 1460 | |
39279cc3 CM |
1461 | void btrfs_delete_inode(struct inode *inode) |
1462 | { | |
1463 | struct btrfs_trans_handle *trans; | |
1464 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1465 | unsigned long nr; |
39279cc3 CM |
1466 | int ret; |
1467 | ||
e6dcd2dc | 1468 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
39279cc3 CM |
1469 | truncate_inode_pages(&inode->i_data, 0); |
1470 | if (is_bad_inode(inode)) { | |
1471 | goto no_delete; | |
1472 | } | |
5f39d397 | 1473 | |
dbe674a9 | 1474 | btrfs_i_size_write(inode, 0); |
39279cc3 | 1475 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1476 | |
39279cc3 | 1477 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1478 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
54aa1f4d CM |
1479 | if (ret) |
1480 | goto no_delete_lock; | |
85e21bac | 1481 | |
d3c2fdcf | 1482 | nr = trans->blocks_used; |
85e21bac | 1483 | clear_inode(inode); |
5f39d397 | 1484 | |
39279cc3 | 1485 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1486 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 1487 | return; |
54aa1f4d CM |
1488 | |
1489 | no_delete_lock: | |
d3c2fdcf | 1490 | nr = trans->blocks_used; |
54aa1f4d | 1491 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1492 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1493 | no_delete: |
1494 | clear_inode(inode); | |
1495 | } | |
1496 | ||
1497 | /* | |
1498 | * this returns the key found in the dir entry in the location pointer. | |
1499 | * If no dir entries were found, location->objectid is 0. | |
1500 | */ | |
1501 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1502 | struct btrfs_key *location) | |
1503 | { | |
1504 | const char *name = dentry->d_name.name; | |
1505 | int namelen = dentry->d_name.len; | |
1506 | struct btrfs_dir_item *di; | |
1507 | struct btrfs_path *path; | |
1508 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1509 | int ret = 0; |
39279cc3 | 1510 | |
3954401f CM |
1511 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1512 | location->objectid = dir->i_ino; | |
1513 | location->type = BTRFS_INODE_ITEM_KEY; | |
1514 | location->offset = 0; | |
1515 | return 0; | |
1516 | } | |
39279cc3 CM |
1517 | path = btrfs_alloc_path(); |
1518 | BUG_ON(!path); | |
3954401f | 1519 | |
7a720536 | 1520 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1521 | struct btrfs_key key; |
1522 | struct extent_buffer *leaf; | |
1523 | u32 nritems; | |
1524 | int slot; | |
1525 | ||
1526 | key.objectid = dir->i_ino; | |
1527 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1528 | key.offset = 0; | |
1529 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1530 | BUG_ON(ret == 0); | |
1531 | ret = 0; | |
1532 | ||
1533 | leaf = path->nodes[0]; | |
1534 | slot = path->slots[0]; | |
1535 | nritems = btrfs_header_nritems(leaf); | |
1536 | if (slot >= nritems) | |
1537 | goto out_err; | |
1538 | ||
1539 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1540 | if (key.objectid != dir->i_ino || | |
1541 | key.type != BTRFS_INODE_REF_KEY) { | |
1542 | goto out_err; | |
1543 | } | |
1544 | location->objectid = key.offset; | |
1545 | location->type = BTRFS_INODE_ITEM_KEY; | |
1546 | location->offset = 0; | |
1547 | goto out; | |
1548 | } | |
1549 | ||
39279cc3 CM |
1550 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1551 | namelen, 0); | |
0d9f7f3e Y |
1552 | if (IS_ERR(di)) |
1553 | ret = PTR_ERR(di); | |
39279cc3 | 1554 | if (!di || IS_ERR(di)) { |
3954401f | 1555 | goto out_err; |
39279cc3 | 1556 | } |
5f39d397 | 1557 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1558 | out: |
39279cc3 CM |
1559 | btrfs_free_path(path); |
1560 | return ret; | |
3954401f CM |
1561 | out_err: |
1562 | location->objectid = 0; | |
1563 | goto out; | |
39279cc3 CM |
1564 | } |
1565 | ||
1566 | /* | |
1567 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1568 | * needs to be changed to reflect the root directory of the tree root. This | |
1569 | * is kind of like crossing a mount point. | |
1570 | */ | |
1571 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1572 | struct btrfs_key *location, | |
58176a96 JB |
1573 | struct btrfs_root **sub_root, |
1574 | struct dentry *dentry) | |
39279cc3 CM |
1575 | { |
1576 | struct btrfs_path *path; | |
1577 | struct btrfs_root_item *ri; | |
1578 | ||
1579 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1580 | return 0; | |
1581 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1582 | return 0; | |
1583 | ||
1584 | path = btrfs_alloc_path(); | |
1585 | BUG_ON(!path); | |
39279cc3 | 1586 | |
58176a96 JB |
1587 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1588 | dentry->d_name.name, | |
1589 | dentry->d_name.len); | |
39279cc3 CM |
1590 | if (IS_ERR(*sub_root)) |
1591 | return PTR_ERR(*sub_root); | |
1592 | ||
1593 | ri = &(*sub_root)->root_item; | |
1594 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1595 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1596 | location->offset = 0; | |
1597 | ||
1598 | btrfs_free_path(path); | |
39279cc3 CM |
1599 | return 0; |
1600 | } | |
1601 | ||
1602 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1603 | { | |
1604 | struct btrfs_iget_args *args = p; | |
1605 | inode->i_ino = args->ino; | |
1606 | BTRFS_I(inode)->root = args->root; | |
9069218d | 1607 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 1608 | BTRFS_I(inode)->disk_i_size = 0; |
d1310b2e CM |
1609 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1610 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1611 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1612 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1613 | inode->i_mapping, GFP_NOFS); | |
ba1da2f4 | 1614 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
1b1e2135 | 1615 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 1616 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
39279cc3 CM |
1617 | return 0; |
1618 | } | |
1619 | ||
1620 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1621 | { | |
1622 | struct btrfs_iget_args *args = opaque; | |
1623 | return (args->ino == inode->i_ino && | |
1624 | args->root == BTRFS_I(inode)->root); | |
1625 | } | |
1626 | ||
dc17ff8f CM |
1627 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1628 | u64 root_objectid) | |
1629 | { | |
1630 | struct btrfs_iget_args args; | |
1631 | args.ino = objectid; | |
1632 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1633 | ||
1634 | if (!args.root) | |
1635 | return NULL; | |
1636 | ||
1637 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1638 | } | |
1639 | ||
39279cc3 CM |
1640 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1641 | struct btrfs_root *root) | |
1642 | { | |
1643 | struct inode *inode; | |
1644 | struct btrfs_iget_args args; | |
1645 | args.ino = objectid; | |
1646 | args.root = root; | |
1647 | ||
1648 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1649 | btrfs_init_locked_inode, | |
1650 | (void *)&args); | |
1651 | return inode; | |
1652 | } | |
1653 | ||
1654 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1655 | struct nameidata *nd) | |
1656 | { | |
1657 | struct inode * inode; | |
1658 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1659 | struct btrfs_root *root = bi->root; | |
1660 | struct btrfs_root *sub_root = root; | |
1661 | struct btrfs_key location; | |
1662 | int ret; | |
1663 | ||
1664 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1665 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1666 | |
39279cc3 | 1667 | ret = btrfs_inode_by_name(dir, dentry, &location); |
5f39d397 | 1668 | |
39279cc3 CM |
1669 | if (ret < 0) |
1670 | return ERR_PTR(ret); | |
5f39d397 | 1671 | |
39279cc3 CM |
1672 | inode = NULL; |
1673 | if (location.objectid) { | |
58176a96 JB |
1674 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1675 | dentry); | |
39279cc3 CM |
1676 | if (ret < 0) |
1677 | return ERR_PTR(ret); | |
1678 | if (ret > 0) | |
1679 | return ERR_PTR(-ENOENT); | |
1680 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1681 | sub_root); | |
1682 | if (!inode) | |
1683 | return ERR_PTR(-EACCES); | |
1684 | if (inode->i_state & I_NEW) { | |
1685 | /* the inode and parent dir are two different roots */ | |
1686 | if (sub_root != root) { | |
1687 | igrab(inode); | |
1688 | sub_root->inode = inode; | |
1689 | } | |
1690 | BTRFS_I(inode)->root = sub_root; | |
1691 | memcpy(&BTRFS_I(inode)->location, &location, | |
1692 | sizeof(location)); | |
1693 | btrfs_read_locked_inode(inode); | |
1694 | unlock_new_inode(inode); | |
1695 | } | |
1696 | } | |
1697 | return d_splice_alias(inode, dentry); | |
1698 | } | |
1699 | ||
39279cc3 CM |
1700 | static unsigned char btrfs_filetype_table[] = { |
1701 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1702 | }; | |
1703 | ||
1704 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1705 | { | |
6da6abae | 1706 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1707 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1708 | struct btrfs_item *item; | |
1709 | struct btrfs_dir_item *di; | |
1710 | struct btrfs_key key; | |
5f39d397 | 1711 | struct btrfs_key found_key; |
39279cc3 CM |
1712 | struct btrfs_path *path; |
1713 | int ret; | |
1714 | u32 nritems; | |
5f39d397 | 1715 | struct extent_buffer *leaf; |
39279cc3 CM |
1716 | int slot; |
1717 | int advance; | |
1718 | unsigned char d_type; | |
1719 | int over = 0; | |
1720 | u32 di_cur; | |
1721 | u32 di_total; | |
1722 | u32 di_len; | |
1723 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1724 | char tmp_name[32]; |
1725 | char *name_ptr; | |
1726 | int name_len; | |
39279cc3 CM |
1727 | |
1728 | /* FIXME, use a real flag for deciding about the key type */ | |
1729 | if (root->fs_info->tree_root == root) | |
1730 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1731 | |
3954401f CM |
1732 | /* special case for "." */ |
1733 | if (filp->f_pos == 0) { | |
1734 | over = filldir(dirent, ".", 1, | |
1735 | 1, inode->i_ino, | |
1736 | DT_DIR); | |
1737 | if (over) | |
1738 | return 0; | |
1739 | filp->f_pos = 1; | |
1740 | } | |
1741 | ||
39279cc3 | 1742 | key.objectid = inode->i_ino; |
3954401f CM |
1743 | path = btrfs_alloc_path(); |
1744 | path->reada = 2; | |
1745 | ||
1746 | /* special case for .., just use the back ref */ | |
1747 | if (filp->f_pos == 1) { | |
1748 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1749 | key.offset = 0; | |
1750 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1751 | BUG_ON(ret == 0); | |
1752 | leaf = path->nodes[0]; | |
1753 | slot = path->slots[0]; | |
1754 | nritems = btrfs_header_nritems(leaf); | |
1755 | if (slot >= nritems) { | |
1756 | btrfs_release_path(root, path); | |
1757 | goto read_dir_items; | |
1758 | } | |
1759 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1760 | btrfs_release_path(root, path); | |
1761 | if (found_key.objectid != key.objectid || | |
1762 | found_key.type != BTRFS_INODE_REF_KEY) | |
1763 | goto read_dir_items; | |
1764 | over = filldir(dirent, "..", 2, | |
1765 | 2, found_key.offset, DT_DIR); | |
1766 | if (over) | |
1767 | goto nopos; | |
1768 | filp->f_pos = 2; | |
1769 | } | |
1770 | ||
1771 | read_dir_items: | |
39279cc3 CM |
1772 | btrfs_set_key_type(&key, key_type); |
1773 | key.offset = filp->f_pos; | |
5f39d397 | 1774 | |
39279cc3 CM |
1775 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1776 | if (ret < 0) | |
1777 | goto err; | |
1778 | advance = 0; | |
39279cc3 | 1779 | while(1) { |
5f39d397 CM |
1780 | leaf = path->nodes[0]; |
1781 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1782 | slot = path->slots[0]; |
1783 | if (advance || slot >= nritems) { | |
1784 | if (slot >= nritems -1) { | |
39279cc3 CM |
1785 | ret = btrfs_next_leaf(root, path); |
1786 | if (ret) | |
1787 | break; | |
5f39d397 CM |
1788 | leaf = path->nodes[0]; |
1789 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1790 | slot = path->slots[0]; |
1791 | } else { | |
1792 | slot++; | |
1793 | path->slots[0]++; | |
1794 | } | |
1795 | } | |
1796 | advance = 1; | |
5f39d397 CM |
1797 | item = btrfs_item_nr(leaf, slot); |
1798 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1799 | ||
1800 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1801 | break; |
5f39d397 | 1802 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1803 | break; |
5f39d397 | 1804 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1805 | continue; |
5f39d397 CM |
1806 | |
1807 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1808 | advance = 1; |
1809 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1810 | di_cur = 0; | |
5f39d397 | 1811 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1812 | while(di_cur < di_total) { |
5f39d397 CM |
1813 | struct btrfs_key location; |
1814 | ||
1815 | name_len = btrfs_dir_name_len(leaf, di); | |
1816 | if (name_len < 32) { | |
1817 | name_ptr = tmp_name; | |
1818 | } else { | |
1819 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1820 | BUG_ON(!name_ptr); | |
1821 | } | |
1822 | read_extent_buffer(leaf, name_ptr, | |
1823 | (unsigned long)(di + 1), name_len); | |
1824 | ||
1825 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1826 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1827 | over = filldir(dirent, name_ptr, name_len, |
1828 | found_key.offset, | |
1829 | location.objectid, | |
39279cc3 | 1830 | d_type); |
5f39d397 CM |
1831 | |
1832 | if (name_ptr != tmp_name) | |
1833 | kfree(name_ptr); | |
1834 | ||
39279cc3 CM |
1835 | if (over) |
1836 | goto nopos; | |
5103e947 JB |
1837 | di_len = btrfs_dir_name_len(leaf, di) + |
1838 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1839 | di_cur += di_len; |
1840 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1841 | } | |
1842 | } | |
5e591a07 YZ |
1843 | if (key_type == BTRFS_DIR_INDEX_KEY) |
1844 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
1845 | else | |
1846 | filp->f_pos++; | |
39279cc3 CM |
1847 | nopos: |
1848 | ret = 0; | |
1849 | err: | |
39279cc3 | 1850 | btrfs_free_path(path); |
39279cc3 CM |
1851 | return ret; |
1852 | } | |
1853 | ||
1854 | int btrfs_write_inode(struct inode *inode, int wait) | |
1855 | { | |
1856 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1857 | struct btrfs_trans_handle *trans; | |
1858 | int ret = 0; | |
1859 | ||
1860 | if (wait) { | |
f9295749 | 1861 | trans = btrfs_join_transaction(root, 1); |
39279cc3 CM |
1862 | btrfs_set_trans_block_group(trans, inode); |
1863 | ret = btrfs_commit_transaction(trans, root); | |
39279cc3 CM |
1864 | } |
1865 | return ret; | |
1866 | } | |
1867 | ||
1868 | /* | |
54aa1f4d | 1869 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1870 | * inode changes. But, it is most likely to find the inode in cache. |
1871 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1872 | * to keep or drop this code. | |
1873 | */ | |
1874 | void btrfs_dirty_inode(struct inode *inode) | |
1875 | { | |
1876 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1877 | struct btrfs_trans_handle *trans; | |
1878 | ||
f9295749 | 1879 | trans = btrfs_join_transaction(root, 1); |
39279cc3 CM |
1880 | btrfs_set_trans_block_group(trans, inode); |
1881 | btrfs_update_inode(trans, root, inode); | |
1882 | btrfs_end_transaction(trans, root); | |
39279cc3 CM |
1883 | } |
1884 | ||
1885 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1886 | struct btrfs_root *root, | |
9c58309d CM |
1887 | const char *name, int name_len, |
1888 | u64 ref_objectid, | |
39279cc3 CM |
1889 | u64 objectid, |
1890 | struct btrfs_block_group_cache *group, | |
1891 | int mode) | |
1892 | { | |
1893 | struct inode *inode; | |
5f39d397 | 1894 | struct btrfs_inode_item *inode_item; |
6324fbf3 | 1895 | struct btrfs_block_group_cache *new_inode_group; |
39279cc3 | 1896 | struct btrfs_key *location; |
5f39d397 | 1897 | struct btrfs_path *path; |
9c58309d CM |
1898 | struct btrfs_inode_ref *ref; |
1899 | struct btrfs_key key[2]; | |
1900 | u32 sizes[2]; | |
1901 | unsigned long ptr; | |
39279cc3 CM |
1902 | int ret; |
1903 | int owner; | |
1904 | ||
5f39d397 CM |
1905 | path = btrfs_alloc_path(); |
1906 | BUG_ON(!path); | |
1907 | ||
39279cc3 CM |
1908 | inode = new_inode(root->fs_info->sb); |
1909 | if (!inode) | |
1910 | return ERR_PTR(-ENOMEM); | |
1911 | ||
d1310b2e CM |
1912 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1913 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1914 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1915 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1916 | inode->i_mapping, GFP_NOFS); | |
ba1da2f4 | 1917 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
1b1e2135 | 1918 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 1919 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
9069218d | 1920 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 1921 | BTRFS_I(inode)->disk_i_size = 0; |
39279cc3 | 1922 | BTRFS_I(inode)->root = root; |
b888db2b | 1923 | |
39279cc3 CM |
1924 | if (mode & S_IFDIR) |
1925 | owner = 0; | |
1926 | else | |
1927 | owner = 1; | |
6324fbf3 | 1928 | new_inode_group = btrfs_find_block_group(root, group, 0, |
0b86a832 | 1929 | BTRFS_BLOCK_GROUP_METADATA, owner); |
6324fbf3 CM |
1930 | if (!new_inode_group) { |
1931 | printk("find_block group failed\n"); | |
1932 | new_inode_group = group; | |
1933 | } | |
1934 | BTRFS_I(inode)->block_group = new_inode_group; | |
b98b6767 | 1935 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
1936 | |
1937 | key[0].objectid = objectid; | |
1938 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
1939 | key[0].offset = 0; | |
1940 | ||
1941 | key[1].objectid = objectid; | |
1942 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
1943 | key[1].offset = ref_objectid; | |
1944 | ||
1945 | sizes[0] = sizeof(struct btrfs_inode_item); | |
1946 | sizes[1] = name_len + sizeof(*ref); | |
1947 | ||
1948 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
1949 | if (ret != 0) | |
5f39d397 CM |
1950 | goto fail; |
1951 | ||
9c58309d CM |
1952 | if (objectid > root->highest_inode) |
1953 | root->highest_inode = objectid; | |
1954 | ||
39279cc3 CM |
1955 | inode->i_uid = current->fsuid; |
1956 | inode->i_gid = current->fsgid; | |
1957 | inode->i_mode = mode; | |
1958 | inode->i_ino = objectid; | |
1959 | inode->i_blocks = 0; | |
1960 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1961 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1962 | struct btrfs_inode_item); | |
1963 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
1964 | |
1965 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
1966 | struct btrfs_inode_ref); | |
1967 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
1968 | ptr = (unsigned long)(ref + 1); | |
1969 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
1970 | ||
5f39d397 CM |
1971 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1972 | btrfs_free_path(path); | |
1973 | ||
39279cc3 CM |
1974 | location = &BTRFS_I(inode)->location; |
1975 | location->objectid = objectid; | |
39279cc3 CM |
1976 | location->offset = 0; |
1977 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1978 | ||
39279cc3 CM |
1979 | insert_inode_hash(inode); |
1980 | return inode; | |
5f39d397 CM |
1981 | fail: |
1982 | btrfs_free_path(path); | |
1983 | return ERR_PTR(ret); | |
39279cc3 CM |
1984 | } |
1985 | ||
1986 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1987 | { | |
1988 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1989 | } | |
1990 | ||
1991 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1992 | struct dentry *dentry, struct inode *inode, |
1993 | int add_backref) | |
39279cc3 CM |
1994 | { |
1995 | int ret; | |
1996 | struct btrfs_key key; | |
1997 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1998 | struct inode *parent_inode; |
5f39d397 | 1999 | |
39279cc3 | 2000 | key.objectid = inode->i_ino; |
39279cc3 CM |
2001 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
2002 | key.offset = 0; | |
2003 | ||
2004 | ret = btrfs_insert_dir_item(trans, root, | |
2005 | dentry->d_name.name, dentry->d_name.len, | |
2006 | dentry->d_parent->d_inode->i_ino, | |
2007 | &key, btrfs_inode_type(inode)); | |
2008 | if (ret == 0) { | |
9c58309d CM |
2009 | if (add_backref) { |
2010 | ret = btrfs_insert_inode_ref(trans, root, | |
2011 | dentry->d_name.name, | |
2012 | dentry->d_name.len, | |
2013 | inode->i_ino, | |
2014 | dentry->d_parent->d_inode->i_ino); | |
2015 | } | |
79c44584 | 2016 | parent_inode = dentry->d_parent->d_inode; |
dbe674a9 CM |
2017 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
2018 | dentry->d_name.len * 2); | |
79c44584 | 2019 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
39279cc3 CM |
2020 | ret = btrfs_update_inode(trans, root, |
2021 | dentry->d_parent->d_inode); | |
2022 | } | |
2023 | return ret; | |
2024 | } | |
2025 | ||
2026 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d CM |
2027 | struct dentry *dentry, struct inode *inode, |
2028 | int backref) | |
39279cc3 | 2029 | { |
9c58309d | 2030 | int err = btrfs_add_link(trans, dentry, inode, backref); |
39279cc3 CM |
2031 | if (!err) { |
2032 | d_instantiate(dentry, inode); | |
2033 | return 0; | |
2034 | } | |
2035 | if (err > 0) | |
2036 | err = -EEXIST; | |
2037 | return err; | |
2038 | } | |
2039 | ||
618e21d5 JB |
2040 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
2041 | int mode, dev_t rdev) | |
2042 | { | |
2043 | struct btrfs_trans_handle *trans; | |
2044 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 2045 | struct inode *inode = NULL; |
618e21d5 JB |
2046 | int err; |
2047 | int drop_inode = 0; | |
2048 | u64 objectid; | |
1832a6d5 | 2049 | unsigned long nr = 0; |
618e21d5 JB |
2050 | |
2051 | if (!new_valid_dev(rdev)) | |
2052 | return -EINVAL; | |
2053 | ||
1832a6d5 CM |
2054 | err = btrfs_check_free_space(root, 1, 0); |
2055 | if (err) | |
2056 | goto fail; | |
2057 | ||
618e21d5 JB |
2058 | trans = btrfs_start_transaction(root, 1); |
2059 | btrfs_set_trans_block_group(trans, dir); | |
2060 | ||
2061 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2062 | if (err) { | |
2063 | err = -ENOSPC; | |
2064 | goto out_unlock; | |
2065 | } | |
2066 | ||
9c58309d CM |
2067 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2068 | dentry->d_name.len, | |
2069 | dentry->d_parent->d_inode->i_ino, objectid, | |
618e21d5 JB |
2070 | BTRFS_I(dir)->block_group, mode); |
2071 | err = PTR_ERR(inode); | |
2072 | if (IS_ERR(inode)) | |
2073 | goto out_unlock; | |
2074 | ||
2075 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 2076 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
618e21d5 JB |
2077 | if (err) |
2078 | drop_inode = 1; | |
2079 | else { | |
2080 | inode->i_op = &btrfs_special_inode_operations; | |
2081 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 2082 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
2083 | } |
2084 | dir->i_sb->s_dirt = 1; | |
2085 | btrfs_update_inode_block_group(trans, inode); | |
2086 | btrfs_update_inode_block_group(trans, dir); | |
2087 | out_unlock: | |
d3c2fdcf | 2088 | nr = trans->blocks_used; |
89ce8a63 | 2089 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2090 | fail: |
618e21d5 JB |
2091 | if (drop_inode) { |
2092 | inode_dec_link_count(inode); | |
2093 | iput(inode); | |
2094 | } | |
d3c2fdcf | 2095 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
2096 | return err; |
2097 | } | |
2098 | ||
39279cc3 CM |
2099 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
2100 | int mode, struct nameidata *nd) | |
2101 | { | |
2102 | struct btrfs_trans_handle *trans; | |
2103 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 2104 | struct inode *inode = NULL; |
39279cc3 CM |
2105 | int err; |
2106 | int drop_inode = 0; | |
1832a6d5 | 2107 | unsigned long nr = 0; |
39279cc3 CM |
2108 | u64 objectid; |
2109 | ||
1832a6d5 CM |
2110 | err = btrfs_check_free_space(root, 1, 0); |
2111 | if (err) | |
2112 | goto fail; | |
39279cc3 CM |
2113 | trans = btrfs_start_transaction(root, 1); |
2114 | btrfs_set_trans_block_group(trans, dir); | |
2115 | ||
2116 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2117 | if (err) { | |
2118 | err = -ENOSPC; | |
2119 | goto out_unlock; | |
2120 | } | |
2121 | ||
9c58309d CM |
2122 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2123 | dentry->d_name.len, | |
2124 | dentry->d_parent->d_inode->i_ino, | |
2125 | objectid, BTRFS_I(dir)->block_group, mode); | |
39279cc3 CM |
2126 | err = PTR_ERR(inode); |
2127 | if (IS_ERR(inode)) | |
2128 | goto out_unlock; | |
2129 | ||
2130 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 2131 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
2132 | if (err) |
2133 | drop_inode = 1; | |
2134 | else { | |
2135 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 2136 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
2137 | inode->i_fop = &btrfs_file_operations; |
2138 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
2139 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2140 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 2141 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
2142 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
2143 | inode->i_mapping, GFP_NOFS); | |
1b1e2135 | 2144 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 2145 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
9069218d | 2146 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 2147 | BTRFS_I(inode)->disk_i_size = 0; |
d1310b2e | 2148 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
ba1da2f4 | 2149 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
39279cc3 CM |
2150 | } |
2151 | dir->i_sb->s_dirt = 1; | |
2152 | btrfs_update_inode_block_group(trans, inode); | |
2153 | btrfs_update_inode_block_group(trans, dir); | |
2154 | out_unlock: | |
d3c2fdcf | 2155 | nr = trans->blocks_used; |
89ce8a63 | 2156 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2157 | fail: |
39279cc3 CM |
2158 | if (drop_inode) { |
2159 | inode_dec_link_count(inode); | |
2160 | iput(inode); | |
2161 | } | |
d3c2fdcf | 2162 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2163 | return err; |
2164 | } | |
2165 | ||
2166 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
2167 | struct dentry *dentry) | |
2168 | { | |
2169 | struct btrfs_trans_handle *trans; | |
2170 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2171 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 2172 | unsigned long nr = 0; |
39279cc3 CM |
2173 | int err; |
2174 | int drop_inode = 0; | |
2175 | ||
2176 | if (inode->i_nlink == 0) | |
2177 | return -ENOENT; | |
2178 | ||
6da6abae CM |
2179 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
2180 | inode->i_nlink++; | |
2181 | #else | |
39279cc3 | 2182 | inc_nlink(inode); |
6da6abae | 2183 | #endif |
1832a6d5 CM |
2184 | err = btrfs_check_free_space(root, 1, 0); |
2185 | if (err) | |
2186 | goto fail; | |
39279cc3 | 2187 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2188 | |
39279cc3 CM |
2189 | btrfs_set_trans_block_group(trans, dir); |
2190 | atomic_inc(&inode->i_count); | |
9c58309d | 2191 | err = btrfs_add_nondir(trans, dentry, inode, 1); |
5f39d397 | 2192 | |
39279cc3 CM |
2193 | if (err) |
2194 | drop_inode = 1; | |
5f39d397 | 2195 | |
39279cc3 CM |
2196 | dir->i_sb->s_dirt = 1; |
2197 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 2198 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 2199 | |
54aa1f4d CM |
2200 | if (err) |
2201 | drop_inode = 1; | |
39279cc3 | 2202 | |
d3c2fdcf | 2203 | nr = trans->blocks_used; |
89ce8a63 | 2204 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2205 | fail: |
39279cc3 CM |
2206 | if (drop_inode) { |
2207 | inode_dec_link_count(inode); | |
2208 | iput(inode); | |
2209 | } | |
d3c2fdcf | 2210 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2211 | return err; |
2212 | } | |
2213 | ||
39279cc3 CM |
2214 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2215 | { | |
b9d86667 | 2216 | struct inode *inode = NULL; |
39279cc3 CM |
2217 | struct btrfs_trans_handle *trans; |
2218 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2219 | int err = 0; | |
2220 | int drop_on_err = 0; | |
b9d86667 | 2221 | u64 objectid = 0; |
d3c2fdcf | 2222 | unsigned long nr = 1; |
39279cc3 | 2223 | |
1832a6d5 CM |
2224 | err = btrfs_check_free_space(root, 1, 0); |
2225 | if (err) | |
2226 | goto out_unlock; | |
2227 | ||
39279cc3 CM |
2228 | trans = btrfs_start_transaction(root, 1); |
2229 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 2230 | |
39279cc3 CM |
2231 | if (IS_ERR(trans)) { |
2232 | err = PTR_ERR(trans); | |
2233 | goto out_unlock; | |
2234 | } | |
2235 | ||
2236 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2237 | if (err) { | |
2238 | err = -ENOSPC; | |
2239 | goto out_unlock; | |
2240 | } | |
2241 | ||
9c58309d CM |
2242 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2243 | dentry->d_name.len, | |
2244 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2245 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
2246 | if (IS_ERR(inode)) { | |
2247 | err = PTR_ERR(inode); | |
2248 | goto out_fail; | |
2249 | } | |
5f39d397 | 2250 | |
39279cc3 CM |
2251 | drop_on_err = 1; |
2252 | inode->i_op = &btrfs_dir_inode_operations; | |
2253 | inode->i_fop = &btrfs_dir_file_operations; | |
2254 | btrfs_set_trans_block_group(trans, inode); | |
2255 | ||
dbe674a9 | 2256 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
2257 | err = btrfs_update_inode(trans, root, inode); |
2258 | if (err) | |
2259 | goto out_fail; | |
5f39d397 | 2260 | |
9c58309d | 2261 | err = btrfs_add_link(trans, dentry, inode, 0); |
39279cc3 CM |
2262 | if (err) |
2263 | goto out_fail; | |
5f39d397 | 2264 | |
39279cc3 CM |
2265 | d_instantiate(dentry, inode); |
2266 | drop_on_err = 0; | |
2267 | dir->i_sb->s_dirt = 1; | |
2268 | btrfs_update_inode_block_group(trans, inode); | |
2269 | btrfs_update_inode_block_group(trans, dir); | |
2270 | ||
2271 | out_fail: | |
d3c2fdcf | 2272 | nr = trans->blocks_used; |
89ce8a63 | 2273 | btrfs_end_transaction_throttle(trans, root); |
5f39d397 | 2274 | |
39279cc3 | 2275 | out_unlock: |
39279cc3 CM |
2276 | if (drop_on_err) |
2277 | iput(inode); | |
d3c2fdcf | 2278 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2279 | return err; |
2280 | } | |
2281 | ||
3b951516 CM |
2282 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
2283 | struct extent_map *existing, | |
e6dcd2dc CM |
2284 | struct extent_map *em, |
2285 | u64 map_start, u64 map_len) | |
3b951516 CM |
2286 | { |
2287 | u64 start_diff; | |
3b951516 | 2288 | |
e6dcd2dc CM |
2289 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
2290 | start_diff = map_start - em->start; | |
2291 | em->start = map_start; | |
2292 | em->len = map_len; | |
2293 | if (em->block_start < EXTENT_MAP_LAST_BYTE) | |
2294 | em->block_start += start_diff; | |
2295 | return add_extent_mapping(em_tree, em); | |
3b951516 CM |
2296 | } |
2297 | ||
a52d9a80 | 2298 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 2299 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
2300 | int create) |
2301 | { | |
2302 | int ret; | |
2303 | int err = 0; | |
db94535d | 2304 | u64 bytenr; |
a52d9a80 CM |
2305 | u64 extent_start = 0; |
2306 | u64 extent_end = 0; | |
2307 | u64 objectid = inode->i_ino; | |
2308 | u32 found_type; | |
a52d9a80 CM |
2309 | struct btrfs_path *path; |
2310 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2311 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
2312 | struct extent_buffer *leaf; |
2313 | struct btrfs_key found_key; | |
a52d9a80 CM |
2314 | struct extent_map *em = NULL; |
2315 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 2316 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
2317 | struct btrfs_trans_handle *trans = NULL; |
2318 | ||
2319 | path = btrfs_alloc_path(); | |
2320 | BUG_ON(!path); | |
a52d9a80 CM |
2321 | |
2322 | again: | |
d1310b2e CM |
2323 | spin_lock(&em_tree->lock); |
2324 | em = lookup_extent_mapping(em_tree, start, len); | |
a061fc8d CM |
2325 | if (em) |
2326 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
d1310b2e CM |
2327 | spin_unlock(&em_tree->lock); |
2328 | ||
a52d9a80 | 2329 | if (em) { |
e1c4b745 CM |
2330 | if (em->start > start || em->start + em->len <= start) |
2331 | free_extent_map(em); | |
2332 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
2333 | free_extent_map(em); |
2334 | else | |
2335 | goto out; | |
a52d9a80 | 2336 | } |
d1310b2e | 2337 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 2338 | if (!em) { |
d1310b2e CM |
2339 | err = -ENOMEM; |
2340 | goto out; | |
a52d9a80 | 2341 | } |
e6dcd2dc | 2342 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e CM |
2343 | em->start = EXTENT_MAP_HOLE; |
2344 | em->len = (u64)-1; | |
179e29e4 CM |
2345 | ret = btrfs_lookup_file_extent(trans, root, path, |
2346 | objectid, start, trans != NULL); | |
a52d9a80 CM |
2347 | if (ret < 0) { |
2348 | err = ret; | |
2349 | goto out; | |
2350 | } | |
2351 | ||
2352 | if (ret != 0) { | |
2353 | if (path->slots[0] == 0) | |
2354 | goto not_found; | |
2355 | path->slots[0]--; | |
2356 | } | |
2357 | ||
5f39d397 CM |
2358 | leaf = path->nodes[0]; |
2359 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 2360 | struct btrfs_file_extent_item); |
a52d9a80 | 2361 | /* are we inside the extent that was found? */ |
5f39d397 CM |
2362 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2363 | found_type = btrfs_key_type(&found_key); | |
2364 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
2365 | found_type != BTRFS_EXTENT_DATA_KEY) { |
2366 | goto not_found; | |
2367 | } | |
2368 | ||
5f39d397 CM |
2369 | found_type = btrfs_file_extent_type(leaf, item); |
2370 | extent_start = found_key.offset; | |
a52d9a80 CM |
2371 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
2372 | extent_end = extent_start + | |
db94535d | 2373 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 2374 | err = 0; |
b888db2b | 2375 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2376 | em->start = start; |
2377 | if (start < extent_start) { | |
d1310b2e | 2378 | if (start + len <= extent_start) |
b888db2b | 2379 | goto not_found; |
d1310b2e | 2380 | em->len = extent_end - extent_start; |
a52d9a80 | 2381 | } else { |
d1310b2e | 2382 | em->len = len; |
a52d9a80 CM |
2383 | } |
2384 | goto not_found_em; | |
2385 | } | |
db94535d CM |
2386 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2387 | if (bytenr == 0) { | |
a52d9a80 | 2388 | em->start = extent_start; |
d1310b2e | 2389 | em->len = extent_end - extent_start; |
5f39d397 | 2390 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2391 | goto insert; |
2392 | } | |
db94535d CM |
2393 | bytenr += btrfs_file_extent_offset(leaf, item); |
2394 | em->block_start = bytenr; | |
a52d9a80 | 2395 | em->start = extent_start; |
d1310b2e | 2396 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2397 | goto insert; |
2398 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2399 | u64 page_start; |
5f39d397 | 2400 | unsigned long ptr; |
a52d9a80 | 2401 | char *map; |
3326d1b0 CM |
2402 | size_t size; |
2403 | size_t extent_offset; | |
2404 | size_t copy_size; | |
a52d9a80 | 2405 | |
5f39d397 CM |
2406 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2407 | path->slots[0])); | |
d1310b2e CM |
2408 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2409 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2410 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2411 | em->start = start; |
2412 | if (start < extent_start) { | |
d1310b2e | 2413 | if (start + len <= extent_start) |
b888db2b | 2414 | goto not_found; |
d1310b2e | 2415 | em->len = extent_end - extent_start; |
a52d9a80 | 2416 | } else { |
d1310b2e | 2417 | em->len = len; |
a52d9a80 CM |
2418 | } |
2419 | goto not_found_em; | |
2420 | } | |
689f9346 | 2421 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2422 | |
2423 | if (!page) { | |
2424 | em->start = extent_start; | |
d1310b2e | 2425 | em->len = size; |
689f9346 Y |
2426 | goto out; |
2427 | } | |
5f39d397 | 2428 | |
70dec807 CM |
2429 | page_start = page_offset(page) + pg_offset; |
2430 | extent_offset = page_start - extent_start; | |
2431 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2432 | size - extent_offset); |
3326d1b0 | 2433 | em->start = extent_start + extent_offset; |
70dec807 CM |
2434 | em->len = (copy_size + root->sectorsize - 1) & |
2435 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2436 | map = kmap(page); |
2437 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2438 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2439 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2440 | copy_size); |
2441 | flush_dcache_page(page); | |
2442 | } else if (create && PageUptodate(page)) { | |
2443 | if (!trans) { | |
2444 | kunmap(page); | |
2445 | free_extent_map(em); | |
2446 | em = NULL; | |
2447 | btrfs_release_path(root, path); | |
f9295749 | 2448 | trans = btrfs_join_transaction(root, 1); |
179e29e4 CM |
2449 | goto again; |
2450 | } | |
70dec807 | 2451 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2452 | copy_size); |
2453 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2454 | } |
a52d9a80 | 2455 | kunmap(page); |
d1310b2e CM |
2456 | set_extent_uptodate(io_tree, em->start, |
2457 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2458 | goto insert; |
2459 | } else { | |
2460 | printk("unkknown found_type %d\n", found_type); | |
2461 | WARN_ON(1); | |
2462 | } | |
2463 | not_found: | |
2464 | em->start = start; | |
d1310b2e | 2465 | em->len = len; |
a52d9a80 | 2466 | not_found_em: |
5f39d397 | 2467 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2468 | insert: |
2469 | btrfs_release_path(root, path); | |
d1310b2e CM |
2470 | if (em->start > start || extent_map_end(em) <= start) { |
2471 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2472 | err = -EIO; |
2473 | goto out; | |
2474 | } | |
d1310b2e CM |
2475 | |
2476 | err = 0; | |
2477 | spin_lock(&em_tree->lock); | |
a52d9a80 | 2478 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
2479 | /* it is possible that someone inserted the extent into the tree |
2480 | * while we had the lock dropped. It is also possible that | |
2481 | * an overlapping map exists in the tree | |
2482 | */ | |
a52d9a80 | 2483 | if (ret == -EEXIST) { |
3b951516 | 2484 | struct extent_map *existing; |
e6dcd2dc CM |
2485 | |
2486 | ret = 0; | |
2487 | ||
3b951516 | 2488 | existing = lookup_extent_mapping(em_tree, start, len); |
e1c4b745 CM |
2489 | if (existing && (existing->start > start || |
2490 | existing->start + existing->len <= start)) { | |
2491 | free_extent_map(existing); | |
2492 | existing = NULL; | |
2493 | } | |
3b951516 CM |
2494 | if (!existing) { |
2495 | existing = lookup_extent_mapping(em_tree, em->start, | |
2496 | em->len); | |
2497 | if (existing) { | |
2498 | err = merge_extent_mapping(em_tree, existing, | |
e6dcd2dc CM |
2499 | em, start, |
2500 | root->sectorsize); | |
3b951516 CM |
2501 | free_extent_map(existing); |
2502 | if (err) { | |
2503 | free_extent_map(em); | |
2504 | em = NULL; | |
2505 | } | |
2506 | } else { | |
2507 | err = -EIO; | |
2508 | printk("failing to insert %Lu %Lu\n", | |
2509 | start, len); | |
2510 | free_extent_map(em); | |
2511 | em = NULL; | |
2512 | } | |
2513 | } else { | |
2514 | free_extent_map(em); | |
2515 | em = existing; | |
e6dcd2dc | 2516 | err = 0; |
a52d9a80 | 2517 | } |
a52d9a80 | 2518 | } |
d1310b2e | 2519 | spin_unlock(&em_tree->lock); |
a52d9a80 CM |
2520 | out: |
2521 | btrfs_free_path(path); | |
2522 | if (trans) { | |
2523 | ret = btrfs_end_transaction(trans, root); | |
e6dcd2dc | 2524 | if (!err) { |
a52d9a80 | 2525 | err = ret; |
e6dcd2dc | 2526 | } |
a52d9a80 | 2527 | } |
a52d9a80 CM |
2528 | if (err) { |
2529 | free_extent_map(em); | |
2530 | WARN_ON(1); | |
2531 | return ERR_PTR(err); | |
2532 | } | |
2533 | return em; | |
2534 | } | |
2535 | ||
e1c4b745 | 2536 | #if 0 /* waiting for O_DIRECT reads */ |
16432985 CM |
2537 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
2538 | struct buffer_head *bh_result, int create) | |
2539 | { | |
2540 | struct extent_map *em; | |
2541 | u64 start = (u64)iblock << inode->i_blkbits; | |
2542 | struct btrfs_multi_bio *multi = NULL; | |
2543 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2544 | u64 len; | |
2545 | u64 logical; | |
2546 | u64 map_length; | |
2547 | int ret = 0; | |
2548 | ||
2549 | em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0); | |
2550 | ||
2551 | if (!em || IS_ERR(em)) | |
2552 | goto out; | |
2553 | ||
e1c4b745 | 2554 | if (em->start > start || em->start + em->len <= start) { |
16432985 | 2555 | goto out; |
e1c4b745 | 2556 | } |
16432985 CM |
2557 | |
2558 | if (em->block_start == EXTENT_MAP_INLINE) { | |
2559 | ret = -EINVAL; | |
2560 | goto out; | |
2561 | } | |
2562 | ||
e1c4b745 CM |
2563 | len = em->start + em->len - start; |
2564 | len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size))); | |
2565 | ||
16432985 CM |
2566 | if (em->block_start == EXTENT_MAP_HOLE || |
2567 | em->block_start == EXTENT_MAP_DELALLOC) { | |
e1c4b745 | 2568 | bh_result->b_size = len; |
16432985 CM |
2569 | goto out; |
2570 | } | |
2571 | ||
16432985 CM |
2572 | logical = start - em->start; |
2573 | logical = em->block_start + logical; | |
2574 | ||
2575 | map_length = len; | |
2576 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
2577 | logical, &map_length, &multi, 0); | |
2578 | BUG_ON(ret); | |
2579 | bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits; | |
2580 | bh_result->b_size = min(map_length, len); | |
e1c4b745 | 2581 | |
16432985 CM |
2582 | bh_result->b_bdev = multi->stripes[0].dev->bdev; |
2583 | set_buffer_mapped(bh_result); | |
2584 | kfree(multi); | |
2585 | out: | |
2586 | free_extent_map(em); | |
2587 | return ret; | |
2588 | } | |
e1c4b745 | 2589 | #endif |
16432985 CM |
2590 | |
2591 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, | |
2592 | const struct iovec *iov, loff_t offset, | |
2593 | unsigned long nr_segs) | |
2594 | { | |
e1c4b745 CM |
2595 | return -EINVAL; |
2596 | #if 0 | |
16432985 CM |
2597 | struct file *file = iocb->ki_filp; |
2598 | struct inode *inode = file->f_mapping->host; | |
2599 | ||
2600 | if (rw == WRITE) | |
2601 | return -EINVAL; | |
2602 | ||
2603 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
2604 | offset, nr_segs, btrfs_get_block, NULL); | |
e1c4b745 | 2605 | #endif |
16432985 CM |
2606 | } |
2607 | ||
d396c6f5 | 2608 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2609 | { |
d396c6f5 | 2610 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2611 | } |
2612 | ||
a52d9a80 | 2613 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2614 | { |
d1310b2e CM |
2615 | struct extent_io_tree *tree; |
2616 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2617 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2618 | } |
1832a6d5 | 2619 | |
a52d9a80 | 2620 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2621 | { |
d1310b2e | 2622 | struct extent_io_tree *tree; |
b888db2b CM |
2623 | |
2624 | ||
2625 | if (current->flags & PF_MEMALLOC) { | |
2626 | redirty_page_for_writepage(wbc, page); | |
2627 | unlock_page(page); | |
2628 | return 0; | |
2629 | } | |
d1310b2e | 2630 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2631 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2632 | } |
2633 | ||
b293f02e CM |
2634 | static int btrfs_writepages(struct address_space *mapping, |
2635 | struct writeback_control *wbc) | |
2636 | { | |
d1310b2e CM |
2637 | struct extent_io_tree *tree; |
2638 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2639 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2640 | } | |
2641 | ||
3ab2fb5a CM |
2642 | static int |
2643 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2644 | struct list_head *pages, unsigned nr_pages) | |
2645 | { | |
d1310b2e CM |
2646 | struct extent_io_tree *tree; |
2647 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2648 | return extent_readpages(tree, mapping, pages, nr_pages, |
2649 | btrfs_get_extent); | |
2650 | } | |
e6dcd2dc | 2651 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2652 | { |
d1310b2e CM |
2653 | struct extent_io_tree *tree; |
2654 | struct extent_map_tree *map; | |
a52d9a80 | 2655 | int ret; |
8c2383c3 | 2656 | |
d1310b2e CM |
2657 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2658 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2659 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 | 2660 | if (ret == 1) { |
4ef64eae | 2661 | invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); |
a52d9a80 CM |
2662 | ClearPagePrivate(page); |
2663 | set_page_private(page, 0); | |
2664 | page_cache_release(page); | |
39279cc3 | 2665 | } |
a52d9a80 | 2666 | return ret; |
39279cc3 CM |
2667 | } |
2668 | ||
e6dcd2dc CM |
2669 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
2670 | { | |
e6dcd2dc CM |
2671 | return __btrfs_releasepage(page, gfp_flags); |
2672 | } | |
2673 | ||
a52d9a80 | 2674 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2675 | { |
d1310b2e | 2676 | struct extent_io_tree *tree; |
e6dcd2dc CM |
2677 | struct btrfs_ordered_extent *ordered; |
2678 | u64 page_start = page_offset(page); | |
2679 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
39279cc3 | 2680 | |
e6dcd2dc | 2681 | wait_on_page_writeback(page); |
d1310b2e | 2682 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
e6dcd2dc CM |
2683 | if (offset) { |
2684 | btrfs_releasepage(page, GFP_NOFS); | |
2685 | return; | |
2686 | } | |
2687 | ||
2688 | lock_extent(tree, page_start, page_end, GFP_NOFS); | |
2689 | ordered = btrfs_lookup_ordered_extent(page->mapping->host, | |
2690 | page_offset(page)); | |
2691 | if (ordered) { | |
eb84ae03 CM |
2692 | /* |
2693 | * IO on this page will never be started, so we need | |
2694 | * to account for any ordered extents now | |
2695 | */ | |
e6dcd2dc CM |
2696 | clear_extent_bit(tree, page_start, page_end, |
2697 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
2698 | EXTENT_LOCKED, 1, 0, GFP_NOFS); | |
211f90e6 CM |
2699 | btrfs_finish_ordered_io(page->mapping->host, |
2700 | page_start, page_end); | |
e6dcd2dc CM |
2701 | btrfs_put_ordered_extent(ordered); |
2702 | lock_extent(tree, page_start, page_end, GFP_NOFS); | |
2703 | } | |
2704 | clear_extent_bit(tree, page_start, page_end, | |
2705 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | | |
2706 | EXTENT_ORDERED, | |
2707 | 1, 1, GFP_NOFS); | |
2708 | __btrfs_releasepage(page, GFP_NOFS); | |
2709 | ||
9ad6b7bc | 2710 | if (PagePrivate(page)) { |
e6dcd2dc CM |
2711 | invalidate_extent_lru(tree, page_offset(page), |
2712 | PAGE_CACHE_SIZE); | |
9ad6b7bc CM |
2713 | ClearPagePrivate(page); |
2714 | set_page_private(page, 0); | |
2715 | page_cache_release(page); | |
2716 | } | |
39279cc3 CM |
2717 | } |
2718 | ||
9ebefb18 CM |
2719 | /* |
2720 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2721 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2722 | * be careful to check for EOF conditions here. We set the page up correctly | |
2723 | * for a written page which means we get ENOSPC checking when writing into | |
2724 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2725 | * support these features. | |
2726 | * | |
2727 | * We are not allowed to take the i_mutex here so we have to play games to | |
2728 | * protect against truncate races as the page could now be beyond EOF. Because | |
2729 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2730 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2731 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2732 | * unlock the page. | |
2733 | */ | |
2734 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2735 | { | |
6da6abae | 2736 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2737 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
2738 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2739 | struct btrfs_ordered_extent *ordered; | |
2740 | char *kaddr; | |
2741 | unsigned long zero_start; | |
9ebefb18 | 2742 | loff_t size; |
1832a6d5 | 2743 | int ret; |
a52d9a80 | 2744 | u64 page_start; |
e6dcd2dc | 2745 | u64 page_end; |
9ebefb18 | 2746 | |
1832a6d5 | 2747 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); |
1832a6d5 CM |
2748 | if (ret) |
2749 | goto out; | |
2750 | ||
2751 | ret = -EINVAL; | |
e6dcd2dc | 2752 | again: |
9ebefb18 | 2753 | lock_page(page); |
9ebefb18 | 2754 | size = i_size_read(inode); |
e6dcd2dc CM |
2755 | page_start = page_offset(page); |
2756 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
a52d9a80 | 2757 | |
9ebefb18 | 2758 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 2759 | (page_start >= size)) { |
9ebefb18 CM |
2760 | /* page got truncated out from underneath us */ |
2761 | goto out_unlock; | |
2762 | } | |
e6dcd2dc CM |
2763 | wait_on_page_writeback(page); |
2764 | ||
2765 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
2766 | set_page_extent_mapped(page); | |
2767 | ||
eb84ae03 CM |
2768 | /* |
2769 | * we can't set the delalloc bits if there are pending ordered | |
2770 | * extents. Drop our locks and wait for them to finish | |
2771 | */ | |
e6dcd2dc CM |
2772 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
2773 | if (ordered) { | |
2774 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
2775 | unlock_page(page); | |
eb84ae03 | 2776 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
2777 | btrfs_put_ordered_extent(ordered); |
2778 | goto again; | |
2779 | } | |
2780 | ||
2781 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, | |
2782 | page_end, GFP_NOFS); | |
2783 | ret = 0; | |
9ebefb18 CM |
2784 | |
2785 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2786 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 2787 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 2788 | else |
e6dcd2dc | 2789 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 2790 | |
e6dcd2dc CM |
2791 | if (zero_start != PAGE_CACHE_SIZE) { |
2792 | kaddr = kmap(page); | |
2793 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
2794 | flush_dcache_page(page); | |
2795 | kunmap(page); | |
2796 | } | |
247e743c | 2797 | ClearPageChecked(page); |
e6dcd2dc CM |
2798 | set_page_dirty(page); |
2799 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
9ebefb18 CM |
2800 | |
2801 | out_unlock: | |
2802 | unlock_page(page); | |
1832a6d5 | 2803 | out: |
9ebefb18 CM |
2804 | return ret; |
2805 | } | |
2806 | ||
39279cc3 CM |
2807 | static void btrfs_truncate(struct inode *inode) |
2808 | { | |
2809 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2810 | int ret; | |
2811 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2812 | unsigned long nr; |
dbe674a9 | 2813 | u64 mask = root->sectorsize - 1; |
39279cc3 CM |
2814 | |
2815 | if (!S_ISREG(inode->i_mode)) | |
2816 | return; | |
2817 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2818 | return; | |
2819 | ||
2820 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2821 | ||
39279cc3 CM |
2822 | trans = btrfs_start_transaction(root, 1); |
2823 | btrfs_set_trans_block_group(trans, inode); | |
dbe674a9 CM |
2824 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
2825 | btrfs_i_size_write(inode, inode->i_size); | |
39279cc3 CM |
2826 | |
2827 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
85e21bac CM |
2828 | ret = btrfs_truncate_in_trans(trans, root, inode, |
2829 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 2830 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2831 | nr = trans->blocks_used; |
5f39d397 | 2832 | |
89ce8a63 | 2833 | ret = btrfs_end_transaction_throttle(trans, root); |
39279cc3 | 2834 | BUG_ON(ret); |
d3c2fdcf | 2835 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2836 | } |
2837 | ||
3b96362c SW |
2838 | /* |
2839 | * Invalidate a single dcache entry at the root of the filesystem. | |
2840 | * Needed after creation of snapshot or subvolume. | |
2841 | */ | |
2842 | void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name, | |
2843 | int namelen) | |
2844 | { | |
2845 | struct dentry *alias, *entry; | |
2846 | struct qstr qstr; | |
2847 | ||
2848 | alias = d_find_alias(root->fs_info->sb->s_root->d_inode); | |
2849 | if (alias) { | |
2850 | qstr.name = name; | |
2851 | qstr.len = namelen; | |
2852 | /* change me if btrfs ever gets a d_hash operation */ | |
2853 | qstr.hash = full_name_hash(qstr.name, qstr.len); | |
2854 | entry = d_lookup(alias, &qstr); | |
2855 | dput(alias); | |
2856 | if (entry) { | |
2857 | d_invalidate(entry); | |
2858 | dput(entry); | |
2859 | } | |
2860 | } | |
2861 | } | |
2862 | ||
f46b5a66 CH |
2863 | int btrfs_create_subvol_root(struct btrfs_root *new_root, |
2864 | struct btrfs_trans_handle *trans, u64 new_dirid, | |
2865 | struct btrfs_block_group_cache *block_group) | |
39279cc3 | 2866 | { |
39279cc3 | 2867 | struct inode *inode; |
39279cc3 | 2868 | int ret; |
39279cc3 | 2869 | |
9c58309d | 2870 | inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid, |
f46b5a66 | 2871 | new_dirid, block_group, S_IFDIR | 0700); |
54aa1f4d | 2872 | if (IS_ERR(inode)) |
f46b5a66 | 2873 | return PTR_ERR(inode); |
39279cc3 CM |
2874 | inode->i_op = &btrfs_dir_inode_operations; |
2875 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2876 | new_root->inode = inode; |
39279cc3 | 2877 | |
3954401f CM |
2878 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2879 | new_dirid); | |
39279cc3 | 2880 | inode->i_nlink = 1; |
dbe674a9 | 2881 | btrfs_i_size_write(inode, 0); |
3b96362c | 2882 | |
f46b5a66 | 2883 | return btrfs_update_inode(trans, new_root, inode); |
39279cc3 CM |
2884 | } |
2885 | ||
edbd8d4e | 2886 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2887 | struct file_ra_state *ra, struct file *file, |
2888 | pgoff_t offset, pgoff_t last_index) | |
2889 | { | |
8e7bf94f | 2890 | pgoff_t req_size = last_index - offset + 1; |
86479a04 CM |
2891 | |
2892 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
86479a04 CM |
2893 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); |
2894 | return offset; | |
2895 | #else | |
86479a04 CM |
2896 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); |
2897 | return offset + req_size; | |
2898 | #endif | |
2899 | } | |
2900 | ||
39279cc3 CM |
2901 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
2902 | { | |
2903 | struct btrfs_inode *ei; | |
2904 | ||
2905 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2906 | if (!ei) | |
2907 | return NULL; | |
15ee9bc7 | 2908 | ei->last_trans = 0; |
e6dcd2dc | 2909 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
39279cc3 CM |
2910 | return &ei->vfs_inode; |
2911 | } | |
2912 | ||
2913 | void btrfs_destroy_inode(struct inode *inode) | |
2914 | { | |
e6dcd2dc | 2915 | struct btrfs_ordered_extent *ordered; |
39279cc3 CM |
2916 | WARN_ON(!list_empty(&inode->i_dentry)); |
2917 | WARN_ON(inode->i_data.nrpages); | |
2918 | ||
e6dcd2dc CM |
2919 | while(1) { |
2920 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); | |
2921 | if (!ordered) | |
2922 | break; | |
2923 | else { | |
2924 | printk("found ordered extent %Lu %Lu\n", | |
2925 | ordered->file_offset, ordered->len); | |
2926 | btrfs_remove_ordered_extent(inode, ordered); | |
2927 | btrfs_put_ordered_extent(ordered); | |
2928 | btrfs_put_ordered_extent(ordered); | |
2929 | } | |
2930 | } | |
8c416c9e | 2931 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
2932 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2933 | } | |
2934 | ||
44ec0b71 CM |
2935 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2936 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2937 | #else | |
39279cc3 CM |
2938 | static void init_once(void * foo, struct kmem_cache * cachep, |
2939 | unsigned long flags) | |
44ec0b71 | 2940 | #endif |
39279cc3 CM |
2941 | { |
2942 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2943 | ||
2944 | inode_init_once(&ei->vfs_inode); | |
2945 | } | |
2946 | ||
2947 | void btrfs_destroy_cachep(void) | |
2948 | { | |
2949 | if (btrfs_inode_cachep) | |
2950 | kmem_cache_destroy(btrfs_inode_cachep); | |
2951 | if (btrfs_trans_handle_cachep) | |
2952 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2953 | if (btrfs_transaction_cachep) | |
2954 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2955 | if (btrfs_bit_radix_cachep) | |
2956 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2957 | if (btrfs_path_cachep) | |
2958 | kmem_cache_destroy(btrfs_path_cachep); | |
2959 | } | |
2960 | ||
86479a04 | 2961 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2962 | unsigned long extra_flags, |
44ec0b71 CM |
2963 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2964 | void (*ctor)(struct kmem_cache *, void *) | |
2965 | #else | |
92fee66d | 2966 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2967 | unsigned long) |
2968 | #endif | |
2969 | ) | |
92fee66d CM |
2970 | { |
2971 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2972 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2973 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2974 | ,NULL | |
2975 | #endif | |
2976 | ); | |
2977 | } | |
2978 | ||
39279cc3 CM |
2979 | int btrfs_init_cachep(void) |
2980 | { | |
86479a04 | 2981 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2982 | sizeof(struct btrfs_inode), |
2983 | 0, init_once); | |
39279cc3 CM |
2984 | if (!btrfs_inode_cachep) |
2985 | goto fail; | |
86479a04 CM |
2986 | btrfs_trans_handle_cachep = |
2987 | btrfs_cache_create("btrfs_trans_handle_cache", | |
2988 | sizeof(struct btrfs_trans_handle), | |
2989 | 0, NULL); | |
39279cc3 CM |
2990 | if (!btrfs_trans_handle_cachep) |
2991 | goto fail; | |
86479a04 | 2992 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 2993 | sizeof(struct btrfs_transaction), |
92fee66d | 2994 | 0, NULL); |
39279cc3 CM |
2995 | if (!btrfs_transaction_cachep) |
2996 | goto fail; | |
86479a04 | 2997 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 2998 | sizeof(struct btrfs_path), |
92fee66d | 2999 | 0, NULL); |
39279cc3 CM |
3000 | if (!btrfs_path_cachep) |
3001 | goto fail; | |
86479a04 | 3002 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 3003 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
3004 | if (!btrfs_bit_radix_cachep) |
3005 | goto fail; | |
3006 | return 0; | |
3007 | fail: | |
3008 | btrfs_destroy_cachep(); | |
3009 | return -ENOMEM; | |
3010 | } | |
3011 | ||
3012 | static int btrfs_getattr(struct vfsmount *mnt, | |
3013 | struct dentry *dentry, struct kstat *stat) | |
3014 | { | |
3015 | struct inode *inode = dentry->d_inode; | |
3016 | generic_fillattr(inode, stat); | |
d6667462 | 3017 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 3018 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
3019 | return 0; |
3020 | } | |
3021 | ||
3022 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
3023 | struct inode * new_dir,struct dentry *new_dentry) | |
3024 | { | |
3025 | struct btrfs_trans_handle *trans; | |
3026 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
3027 | struct inode *new_inode = new_dentry->d_inode; | |
3028 | struct inode *old_inode = old_dentry->d_inode; | |
3029 | struct timespec ctime = CURRENT_TIME; | |
39279cc3 CM |
3030 | int ret; |
3031 | ||
3032 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
3033 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
3034 | return -ENOTEMPTY; | |
3035 | } | |
5f39d397 | 3036 | |
1832a6d5 CM |
3037 | ret = btrfs_check_free_space(root, 1, 0); |
3038 | if (ret) | |
3039 | goto out_unlock; | |
3040 | ||
39279cc3 | 3041 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 3042 | |
39279cc3 | 3043 | btrfs_set_trans_block_group(trans, new_dir); |
39279cc3 CM |
3044 | |
3045 | old_dentry->d_inode->i_nlink++; | |
3046 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
3047 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
3048 | old_inode->i_ctime = ctime; | |
5f39d397 | 3049 | |
39279cc3 CM |
3050 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
3051 | if (ret) | |
3052 | goto out_fail; | |
3053 | ||
3054 | if (new_inode) { | |
3055 | new_inode->i_ctime = CURRENT_TIME; | |
3056 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
3057 | if (ret) | |
3058 | goto out_fail; | |
39279cc3 | 3059 | } |
9c58309d | 3060 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1); |
39279cc3 CM |
3061 | if (ret) |
3062 | goto out_fail; | |
3063 | ||
3064 | out_fail: | |
39279cc3 | 3065 | btrfs_end_transaction(trans, root); |
1832a6d5 | 3066 | out_unlock: |
39279cc3 CM |
3067 | return ret; |
3068 | } | |
3069 | ||
3070 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
3071 | const char *symname) | |
3072 | { | |
3073 | struct btrfs_trans_handle *trans; | |
3074 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
3075 | struct btrfs_path *path; | |
3076 | struct btrfs_key key; | |
1832a6d5 | 3077 | struct inode *inode = NULL; |
39279cc3 CM |
3078 | int err; |
3079 | int drop_inode = 0; | |
3080 | u64 objectid; | |
3081 | int name_len; | |
3082 | int datasize; | |
5f39d397 | 3083 | unsigned long ptr; |
39279cc3 | 3084 | struct btrfs_file_extent_item *ei; |
5f39d397 | 3085 | struct extent_buffer *leaf; |
1832a6d5 | 3086 | unsigned long nr = 0; |
39279cc3 CM |
3087 | |
3088 | name_len = strlen(symname) + 1; | |
3089 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
3090 | return -ENAMETOOLONG; | |
1832a6d5 | 3091 | |
1832a6d5 CM |
3092 | err = btrfs_check_free_space(root, 1, 0); |
3093 | if (err) | |
3094 | goto out_fail; | |
3095 | ||
39279cc3 CM |
3096 | trans = btrfs_start_transaction(root, 1); |
3097 | btrfs_set_trans_block_group(trans, dir); | |
3098 | ||
3099 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
3100 | if (err) { | |
3101 | err = -ENOSPC; | |
3102 | goto out_unlock; | |
3103 | } | |
3104 | ||
9c58309d CM |
3105 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
3106 | dentry->d_name.len, | |
3107 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
3108 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); |
3109 | err = PTR_ERR(inode); | |
3110 | if (IS_ERR(inode)) | |
3111 | goto out_unlock; | |
3112 | ||
3113 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 3114 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
3115 | if (err) |
3116 | drop_inode = 1; | |
3117 | else { | |
3118 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 3119 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
3120 | inode->i_fop = &btrfs_file_operations; |
3121 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
3122 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
3123 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 3124 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
3125 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
3126 | inode->i_mapping, GFP_NOFS); | |
1b1e2135 | 3127 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 3128 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
9069218d | 3129 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 3130 | BTRFS_I(inode)->disk_i_size = 0; |
d1310b2e | 3131 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
ba1da2f4 | 3132 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
39279cc3 CM |
3133 | } |
3134 | dir->i_sb->s_dirt = 1; | |
3135 | btrfs_update_inode_block_group(trans, inode); | |
3136 | btrfs_update_inode_block_group(trans, dir); | |
3137 | if (drop_inode) | |
3138 | goto out_unlock; | |
3139 | ||
3140 | path = btrfs_alloc_path(); | |
3141 | BUG_ON(!path); | |
3142 | key.objectid = inode->i_ino; | |
3143 | key.offset = 0; | |
39279cc3 CM |
3144 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
3145 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
3146 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
3147 | datasize); | |
54aa1f4d CM |
3148 | if (err) { |
3149 | drop_inode = 1; | |
3150 | goto out_unlock; | |
3151 | } | |
5f39d397 CM |
3152 | leaf = path->nodes[0]; |
3153 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
3154 | struct btrfs_file_extent_item); | |
3155 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
3156 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
3157 | BTRFS_FILE_EXTENT_INLINE); |
3158 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
3159 | write_extent_buffer(leaf, symname, ptr, name_len); |
3160 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 3161 | btrfs_free_path(path); |
5f39d397 | 3162 | |
39279cc3 CM |
3163 | inode->i_op = &btrfs_symlink_inode_operations; |
3164 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 3165 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
dbe674a9 | 3166 | btrfs_i_size_write(inode, name_len - 1); |
54aa1f4d CM |
3167 | err = btrfs_update_inode(trans, root, inode); |
3168 | if (err) | |
3169 | drop_inode = 1; | |
39279cc3 CM |
3170 | |
3171 | out_unlock: | |
d3c2fdcf | 3172 | nr = trans->blocks_used; |
89ce8a63 | 3173 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 3174 | out_fail: |
39279cc3 CM |
3175 | if (drop_inode) { |
3176 | inode_dec_link_count(inode); | |
3177 | iput(inode); | |
3178 | } | |
d3c2fdcf | 3179 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
3180 | return err; |
3181 | } | |
16432985 | 3182 | |
e6dcd2dc CM |
3183 | static int btrfs_set_page_dirty(struct page *page) |
3184 | { | |
e6dcd2dc CM |
3185 | return __set_page_dirty_nobuffers(page); |
3186 | } | |
3187 | ||
fdebe2bd Y |
3188 | static int btrfs_permission(struct inode *inode, int mask, |
3189 | struct nameidata *nd) | |
3190 | { | |
3191 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
3192 | return -EACCES; | |
3193 | return generic_permission(inode, mask, NULL); | |
3194 | } | |
39279cc3 CM |
3195 | |
3196 | static struct inode_operations btrfs_dir_inode_operations = { | |
3197 | .lookup = btrfs_lookup, | |
3198 | .create = btrfs_create, | |
3199 | .unlink = btrfs_unlink, | |
3200 | .link = btrfs_link, | |
3201 | .mkdir = btrfs_mkdir, | |
3202 | .rmdir = btrfs_rmdir, | |
3203 | .rename = btrfs_rename, | |
3204 | .symlink = btrfs_symlink, | |
3205 | .setattr = btrfs_setattr, | |
618e21d5 | 3206 | .mknod = btrfs_mknod, |
5103e947 JB |
3207 | .setxattr = generic_setxattr, |
3208 | .getxattr = generic_getxattr, | |
3209 | .listxattr = btrfs_listxattr, | |
3210 | .removexattr = generic_removexattr, | |
fdebe2bd | 3211 | .permission = btrfs_permission, |
39279cc3 | 3212 | }; |
39279cc3 CM |
3213 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3214 | .lookup = btrfs_lookup, | |
fdebe2bd | 3215 | .permission = btrfs_permission, |
39279cc3 | 3216 | }; |
39279cc3 CM |
3217 | static struct file_operations btrfs_dir_file_operations = { |
3218 | .llseek = generic_file_llseek, | |
3219 | .read = generic_read_dir, | |
3220 | .readdir = btrfs_readdir, | |
34287aa3 | 3221 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 3222 | #ifdef CONFIG_COMPAT |
34287aa3 | 3223 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 3224 | #endif |
6bf13c0c | 3225 | .release = btrfs_release_file, |
39279cc3 CM |
3226 | }; |
3227 | ||
d1310b2e | 3228 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 3229 | .fill_delalloc = run_delalloc_range, |
065631f6 | 3230 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 3231 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac CM |
3232 | .readpage_io_hook = btrfs_readpage_io_hook, |
3233 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
e6dcd2dc | 3234 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 3235 | .writepage_start_hook = btrfs_writepage_start_hook, |
1259ab75 | 3236 | .readpage_io_failed_hook = btrfs_io_failed_hook, |
b0c68f8b CM |
3237 | .set_bit_hook = btrfs_set_bit_hook, |
3238 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
3239 | }; |
3240 | ||
39279cc3 CM |
3241 | static struct address_space_operations btrfs_aops = { |
3242 | .readpage = btrfs_readpage, | |
3243 | .writepage = btrfs_writepage, | |
b293f02e | 3244 | .writepages = btrfs_writepages, |
3ab2fb5a | 3245 | .readpages = btrfs_readpages, |
39279cc3 | 3246 | .sync_page = block_sync_page, |
39279cc3 | 3247 | .bmap = btrfs_bmap, |
16432985 | 3248 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
3249 | .invalidatepage = btrfs_invalidatepage, |
3250 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 3251 | .set_page_dirty = btrfs_set_page_dirty, |
39279cc3 CM |
3252 | }; |
3253 | ||
3254 | static struct address_space_operations btrfs_symlink_aops = { | |
3255 | .readpage = btrfs_readpage, | |
3256 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3257 | .invalidatepage = btrfs_invalidatepage, |
3258 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3259 | }; |
3260 | ||
3261 | static struct inode_operations btrfs_file_inode_operations = { | |
3262 | .truncate = btrfs_truncate, | |
3263 | .getattr = btrfs_getattr, | |
3264 | .setattr = btrfs_setattr, | |
5103e947 JB |
3265 | .setxattr = generic_setxattr, |
3266 | .getxattr = generic_getxattr, | |
3267 | .listxattr = btrfs_listxattr, | |
3268 | .removexattr = generic_removexattr, | |
fdebe2bd | 3269 | .permission = btrfs_permission, |
39279cc3 | 3270 | }; |
618e21d5 JB |
3271 | static struct inode_operations btrfs_special_inode_operations = { |
3272 | .getattr = btrfs_getattr, | |
3273 | .setattr = btrfs_setattr, | |
fdebe2bd | 3274 | .permission = btrfs_permission, |
618e21d5 | 3275 | }; |
39279cc3 CM |
3276 | static struct inode_operations btrfs_symlink_inode_operations = { |
3277 | .readlink = generic_readlink, | |
3278 | .follow_link = page_follow_link_light, | |
3279 | .put_link = page_put_link, | |
fdebe2bd | 3280 | .permission = btrfs_permission, |
39279cc3 | 3281 | }; |