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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
065631f6 | 19 | #include <linux/bio.h> |
39279cc3 CM |
20 | #include <linux/buffer_head.h> |
21 | #include <linux/fs.h> | |
22 | #include <linux/pagemap.h> | |
23 | #include <linux/highmem.h> | |
24 | #include <linux/time.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/string.h> | |
27 | #include <linux/smp_lock.h> | |
28 | #include <linux/backing-dev.h> | |
29 | #include <linux/mpage.h> | |
30 | #include <linux/swap.h> | |
31 | #include <linux/writeback.h> | |
32 | #include <linux/statfs.h> | |
33 | #include <linux/compat.h> | |
9ebefb18 | 34 | #include <linux/bit_spinlock.h> |
92fee66d | 35 | #include <linux/version.h> |
5103e947 | 36 | #include <linux/xattr.h> |
39279cc3 CM |
37 | #include "ctree.h" |
38 | #include "disk-io.h" | |
39 | #include "transaction.h" | |
40 | #include "btrfs_inode.h" | |
41 | #include "ioctl.h" | |
42 | #include "print-tree.h" | |
0b86a832 | 43 | #include "volumes.h" |
39279cc3 CM |
44 | |
45 | struct btrfs_iget_args { | |
46 | u64 ino; | |
47 | struct btrfs_root *root; | |
48 | }; | |
49 | ||
50 | static struct inode_operations btrfs_dir_inode_operations; | |
51 | static struct inode_operations btrfs_symlink_inode_operations; | |
52 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 53 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
54 | static struct inode_operations btrfs_file_inode_operations; |
55 | static struct address_space_operations btrfs_aops; | |
56 | static struct address_space_operations btrfs_symlink_aops; | |
57 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 58 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
59 | |
60 | static struct kmem_cache *btrfs_inode_cachep; | |
61 | struct kmem_cache *btrfs_trans_handle_cachep; | |
62 | struct kmem_cache *btrfs_transaction_cachep; | |
63 | struct kmem_cache *btrfs_bit_radix_cachep; | |
64 | struct kmem_cache *btrfs_path_cachep; | |
65 | ||
66 | #define S_SHIFT 12 | |
67 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
68 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
69 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
70 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
71 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
72 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
73 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
74 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
75 | }; | |
76 | ||
1832a6d5 CM |
77 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
78 | int for_del) | |
79 | { | |
80 | u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
81 | u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
82 | u64 thresh; | |
83 | int ret = 0; | |
84 | ||
85 | if (for_del) | |
f9ef6604 | 86 | thresh = total * 90; |
1832a6d5 | 87 | else |
f9ef6604 CM |
88 | thresh = total * 85; |
89 | ||
90 | do_div(thresh, 100); | |
1832a6d5 CM |
91 | |
92 | spin_lock(&root->fs_info->delalloc_lock); | |
93 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) | |
94 | ret = -ENOSPC; | |
95 | spin_unlock(&root->fs_info->delalloc_lock); | |
96 | return ret; | |
97 | } | |
98 | ||
be20aa9d | 99 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
100 | { |
101 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
102 | struct btrfs_trans_handle *trans; | |
b888db2b | 103 | u64 alloc_hint = 0; |
db94535d | 104 | u64 num_bytes; |
c59f8951 | 105 | u64 cur_alloc_size; |
db94535d | 106 | u64 blocksize = root->sectorsize; |
d1310b2e CM |
107 | u64 orig_start = start; |
108 | u64 orig_num_bytes; | |
be20aa9d CM |
109 | struct btrfs_key ins; |
110 | int ret; | |
b888db2b | 111 | |
b888db2b | 112 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 113 | BUG_ON(!trans); |
be20aa9d CM |
114 | btrfs_set_trans_block_group(trans, inode); |
115 | ||
db94535d | 116 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 117 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 118 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 119 | start, start + num_bytes, start, &alloc_hint); |
d1310b2e | 120 | orig_num_bytes = num_bytes; |
db94535d | 121 | |
179e29e4 CM |
122 | if (alloc_hint == EXTENT_MAP_INLINE) |
123 | goto out; | |
124 | ||
c59f8951 CM |
125 | while(num_bytes > 0) { |
126 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
127 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
128 | root->root_key.objectid, | |
129 | trans->transid, | |
130 | inode->i_ino, start, 0, | |
131 | alloc_hint, (u64)-1, &ins, 1); | |
132 | if (ret) { | |
133 | WARN_ON(1); | |
134 | goto out; | |
135 | } | |
136 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
137 | start, ins.objectid, ins.offset, | |
138 | ins.offset); | |
9069218d | 139 | inode->i_blocks += ins.offset >> 9; |
5f56406a | 140 | btrfs_check_file(root, inode); |
c59f8951 CM |
141 | num_bytes -= cur_alloc_size; |
142 | alloc_hint = ins.objectid + ins.offset; | |
143 | start += cur_alloc_size; | |
b888db2b | 144 | } |
d1310b2e CM |
145 | btrfs_drop_extent_cache(inode, orig_start, |
146 | orig_start + orig_num_bytes - 1); | |
dc17ff8f | 147 | btrfs_add_ordered_inode(inode); |
9069218d | 148 | btrfs_update_inode(trans, root, inode); |
b888db2b CM |
149 | out: |
150 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
151 | return ret; |
152 | } | |
153 | ||
154 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
155 | { | |
156 | u64 extent_start; | |
157 | u64 extent_end; | |
158 | u64 bytenr; | |
159 | u64 cow_end; | |
1832a6d5 | 160 | u64 loops = 0; |
c31f8830 | 161 | u64 total_fs_bytes; |
be20aa9d CM |
162 | struct btrfs_root *root = BTRFS_I(inode)->root; |
163 | struct extent_buffer *leaf; | |
164 | int found_type; | |
165 | struct btrfs_path *path; | |
166 | struct btrfs_file_extent_item *item; | |
167 | int ret; | |
168 | int err; | |
169 | struct btrfs_key found_key; | |
170 | ||
c31f8830 | 171 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
172 | path = btrfs_alloc_path(); |
173 | BUG_ON(!path); | |
174 | again: | |
175 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
176 | inode->i_ino, start, 0); | |
177 | if (ret < 0) { | |
178 | btrfs_free_path(path); | |
179 | return ret; | |
180 | } | |
181 | ||
182 | cow_end = end; | |
183 | if (ret != 0) { | |
184 | if (path->slots[0] == 0) | |
185 | goto not_found; | |
186 | path->slots[0]--; | |
187 | } | |
188 | ||
189 | leaf = path->nodes[0]; | |
190 | item = btrfs_item_ptr(leaf, path->slots[0], | |
191 | struct btrfs_file_extent_item); | |
192 | ||
193 | /* are we inside the extent that was found? */ | |
194 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
195 | found_type = btrfs_key_type(&found_key); | |
196 | if (found_key.objectid != inode->i_ino || | |
197 | found_type != BTRFS_EXTENT_DATA_KEY) { | |
198 | goto not_found; | |
199 | } | |
200 | ||
201 | found_type = btrfs_file_extent_type(leaf, item); | |
202 | extent_start = found_key.offset; | |
203 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
204 | u64 extent_num_bytes; |
205 | ||
206 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
207 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
208 | err = 0; |
209 | ||
1832a6d5 CM |
210 | if (loops && start != extent_start) |
211 | goto not_found; | |
212 | ||
be20aa9d CM |
213 | if (start < extent_start || start >= extent_end) |
214 | goto not_found; | |
215 | ||
216 | cow_end = min(end, extent_end - 1); | |
217 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
218 | if (bytenr == 0) | |
219 | goto not_found; | |
220 | ||
c31f8830 CM |
221 | /* |
222 | * we may be called by the resizer, make sure we're inside | |
223 | * the limits of the FS | |
224 | */ | |
225 | if (bytenr + extent_num_bytes > total_fs_bytes) | |
226 | goto not_found; | |
227 | ||
be20aa9d CM |
228 | if (btrfs_count_snapshots_in_path(root, path, bytenr) != 1) { |
229 | goto not_found; | |
230 | } | |
231 | ||
232 | start = extent_end; | |
bd09835d | 233 | } else { |
be20aa9d CM |
234 | goto not_found; |
235 | } | |
236 | loop: | |
237 | if (start > end) { | |
238 | btrfs_free_path(path); | |
239 | return 0; | |
240 | } | |
241 | btrfs_release_path(root, path); | |
1832a6d5 | 242 | loops++; |
be20aa9d CM |
243 | goto again; |
244 | ||
245 | not_found: | |
246 | cow_file_range(inode, start, cow_end); | |
247 | start = cow_end + 1; | |
248 | goto loop; | |
249 | } | |
250 | ||
251 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
252 | { | |
253 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
254 | int ret; | |
be20aa9d | 255 | mutex_lock(&root->fs_info->fs_mutex); |
b98b6767 Y |
256 | if (btrfs_test_opt(root, NODATACOW) || |
257 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
258 | ret = run_delalloc_nocow(inode, start, end); |
259 | else | |
260 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 261 | |
b888db2b CM |
262 | mutex_unlock(&root->fs_info->fs_mutex); |
263 | return ret; | |
264 | } | |
265 | ||
291d673e | 266 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 267 | unsigned long old, unsigned long bits) |
291d673e | 268 | { |
b0c68f8b | 269 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e CM |
270 | struct btrfs_root *root = BTRFS_I(inode)->root; |
271 | spin_lock(&root->fs_info->delalloc_lock); | |
9069218d | 272 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e CM |
273 | root->fs_info->delalloc_bytes += end - start + 1; |
274 | spin_unlock(&root->fs_info->delalloc_lock); | |
275 | } | |
276 | return 0; | |
277 | } | |
278 | ||
279 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 280 | unsigned long old, unsigned long bits) |
291d673e | 281 | { |
b0c68f8b | 282 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e CM |
283 | struct btrfs_root *root = BTRFS_I(inode)->root; |
284 | spin_lock(&root->fs_info->delalloc_lock); | |
b0c68f8b CM |
285 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
286 | printk("warning: delalloc account %Lu %Lu\n", | |
287 | end - start + 1, root->fs_info->delalloc_bytes); | |
288 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 289 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
290 | } else { |
291 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 292 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 293 | } |
291d673e CM |
294 | spin_unlock(&root->fs_info->delalloc_lock); |
295 | } | |
296 | return 0; | |
297 | } | |
298 | ||
239b14b3 CM |
299 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
300 | size_t size, struct bio *bio) | |
301 | { | |
302 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
303 | struct btrfs_mapping_tree *map_tree; | |
239b14b3 | 304 | u64 logical = bio->bi_sector << 9; |
239b14b3 CM |
305 | u64 length = 0; |
306 | u64 map_length; | |
307 | struct bio_vec *bvec; | |
308 | int i; | |
309 | int ret; | |
310 | ||
311 | bio_for_each_segment(bvec, bio, i) { | |
312 | length += bvec->bv_len; | |
313 | } | |
314 | map_tree = &root->fs_info->mapping_tree; | |
315 | map_length = length; | |
cea9e445 | 316 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 317 | &map_length, NULL, 0); |
cea9e445 | 318 | |
239b14b3 | 319 | if (map_length < length + size) { |
239b14b3 CM |
320 | return 1; |
321 | } | |
322 | return 0; | |
323 | } | |
324 | ||
f188591e CM |
325 | int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
326 | int mirror_num) | |
065631f6 | 327 | { |
065631f6 CM |
328 | struct btrfs_root *root = BTRFS_I(inode)->root; |
329 | struct btrfs_trans_handle *trans; | |
330 | int ret = 0; | |
331 | ||
22c59948 CM |
332 | if (!(rw & (1 << BIO_RW))) { |
333 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); | |
334 | BUG_ON(ret); | |
0b86a832 CM |
335 | goto mapit; |
336 | } | |
065631f6 CM |
337 | |
338 | if (btrfs_test_opt(root, NODATASUM) || | |
0b86a832 CM |
339 | btrfs_test_flag(inode, NODATASUM)) { |
340 | goto mapit; | |
341 | } | |
065631f6 CM |
342 | |
343 | mutex_lock(&root->fs_info->fs_mutex); | |
344 | trans = btrfs_start_transaction(root, 1); | |
345 | btrfs_set_trans_block_group(trans, inode); | |
346 | btrfs_csum_file_blocks(trans, root, inode, bio); | |
347 | ret = btrfs_end_transaction(trans, root); | |
348 | BUG_ON(ret); | |
349 | mutex_unlock(&root->fs_info->fs_mutex); | |
0b86a832 | 350 | mapit: |
f188591e | 351 | return btrfs_map_bio(root, rw, bio, mirror_num); |
065631f6 | 352 | } |
6885f308 | 353 | |
07157aac CM |
354 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) |
355 | { | |
356 | int ret = 0; | |
357 | struct inode *inode = page->mapping->host; | |
358 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 359 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
360 | struct btrfs_csum_item *item; |
361 | struct btrfs_path *path = NULL; | |
ff79f819 | 362 | u32 csum; |
b98b6767 Y |
363 | if (btrfs_test_opt(root, NODATASUM) || |
364 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 365 | return 0; |
07157aac CM |
366 | mutex_lock(&root->fs_info->fs_mutex); |
367 | path = btrfs_alloc_path(); | |
368 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
369 | if (IS_ERR(item)) { | |
370 | ret = PTR_ERR(item); | |
371 | /* a csum that isn't present is a preallocated region. */ | |
372 | if (ret == -ENOENT || ret == -EFBIG) | |
373 | ret = 0; | |
ff79f819 | 374 | csum = 0; |
aadfeb6e | 375 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start); |
07157aac CM |
376 | goto out; |
377 | } | |
ff79f819 CM |
378 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
379 | BTRFS_CRC32_SIZE); | |
d1310b2e | 380 | set_state_private(io_tree, start, csum); |
07157aac CM |
381 | out: |
382 | if (path) | |
383 | btrfs_free_path(path); | |
384 | mutex_unlock(&root->fs_info->fs_mutex); | |
385 | return ret; | |
386 | } | |
387 | ||
7e38326f CM |
388 | struct io_failure_record { |
389 | struct page *page; | |
390 | u64 start; | |
391 | u64 len; | |
392 | u64 logical; | |
393 | int last_mirror; | |
394 | }; | |
395 | ||
396 | int btrfs_readpage_io_failed_hook(struct bio *failed_bio, | |
397 | struct page *page, u64 start, u64 end, | |
398 | struct extent_state *state) | |
399 | { | |
400 | struct io_failure_record *failrec = NULL; | |
401 | u64 private; | |
402 | struct extent_map *em; | |
403 | struct inode *inode = page->mapping->host; | |
404 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
405 | struct bio *bio; | |
406 | int num_copies; | |
407 | int ret; | |
408 | u64 logical; | |
409 | ||
410 | ret = get_state_private(failure_tree, start, &private); | |
411 | if (ret) { | |
412 | size_t pg_offset = start - page_offset(page); | |
413 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); | |
414 | if (!failrec) | |
415 | return -ENOMEM; | |
416 | failrec->start = start; | |
417 | failrec->len = end - start + 1; | |
418 | failrec->last_mirror = 0; | |
419 | ||
420 | em = btrfs_get_extent(inode, NULL, pg_offset, start, | |
421 | failrec->len, 0); | |
422 | ||
423 | if (!em || IS_ERR(em)) { | |
424 | kfree(failrec); | |
425 | return -EIO; | |
426 | } | |
427 | logical = start - em->start; | |
428 | logical = em->block_start + logical; | |
429 | failrec->logical = logical; | |
430 | free_extent_map(em); | |
431 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | | |
432 | EXTENT_DIRTY, GFP_NOFS); | |
587f7704 CM |
433 | set_state_private(failure_tree, start, |
434 | (u64)(unsigned long)failrec); | |
7e38326f | 435 | } else { |
587f7704 | 436 | failrec = (struct io_failure_record *)(unsigned long)private; |
7e38326f CM |
437 | } |
438 | num_copies = btrfs_num_copies( | |
439 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
440 | failrec->logical, failrec->len); | |
441 | failrec->last_mirror++; | |
442 | if (!state) { | |
443 | spin_lock_irq(&BTRFS_I(inode)->io_tree.lock); | |
444 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
445 | failrec->start, | |
446 | EXTENT_LOCKED); | |
447 | if (state && state->start != failrec->start) | |
448 | state = NULL; | |
449 | spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock); | |
450 | } | |
451 | if (!state || failrec->last_mirror > num_copies) { | |
452 | set_state_private(failure_tree, failrec->start, 0); | |
453 | clear_extent_bits(failure_tree, failrec->start, | |
454 | failrec->start + failrec->len - 1, | |
455 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
456 | kfree(failrec); | |
457 | return -EIO; | |
458 | } | |
459 | bio = bio_alloc(GFP_NOFS, 1); | |
460 | bio->bi_private = state; | |
461 | bio->bi_end_io = failed_bio->bi_end_io; | |
462 | bio->bi_sector = failrec->logical >> 9; | |
463 | bio->bi_bdev = failed_bio->bi_bdev; | |
464 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); | |
465 | btrfs_submit_bio_hook(inode, READ, bio, failrec->last_mirror); | |
466 | return 0; | |
467 | } | |
468 | ||
70dec807 CM |
469 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
470 | struct extent_state *state) | |
07157aac | 471 | { |
35ebb934 | 472 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 473 | struct inode *inode = page->mapping->host; |
d1310b2e | 474 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 475 | char *kaddr; |
aadfeb6e | 476 | u64 private = ~(u32)0; |
07157aac | 477 | int ret; |
ff79f819 CM |
478 | struct btrfs_root *root = BTRFS_I(inode)->root; |
479 | u32 csum = ~(u32)0; | |
bbf0d006 | 480 | unsigned long flags; |
d1310b2e | 481 | |
b98b6767 Y |
482 | if (btrfs_test_opt(root, NODATASUM) || |
483 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 484 | return 0; |
c2e639f0 | 485 | if (state && state->start == start) { |
70dec807 CM |
486 | private = state->private; |
487 | ret = 0; | |
488 | } else { | |
489 | ret = get_state_private(io_tree, start, &private); | |
490 | } | |
bbf0d006 | 491 | local_irq_save(flags); |
07157aac CM |
492 | kaddr = kmap_atomic(page, KM_IRQ0); |
493 | if (ret) { | |
494 | goto zeroit; | |
495 | } | |
ff79f819 CM |
496 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
497 | btrfs_csum_final(csum, (char *)&csum); | |
498 | if (csum != private) { | |
07157aac CM |
499 | goto zeroit; |
500 | } | |
501 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 502 | local_irq_restore(flags); |
7e38326f CM |
503 | |
504 | /* if the io failure tree for this inode is non-empty, | |
505 | * check to see if we've recovered from a failed IO | |
506 | */ | |
507 | private = 0; | |
508 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
509 | (u64)-1, 1, EXTENT_DIRTY)) { | |
510 | u64 private_failure; | |
511 | struct io_failure_record *failure; | |
512 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, | |
513 | start, &private_failure); | |
514 | if (ret == 0) { | |
587f7704 CM |
515 | failure = (struct io_failure_record *)(unsigned long) |
516 | private_failure; | |
7e38326f CM |
517 | set_state_private(&BTRFS_I(inode)->io_failure_tree, |
518 | failure->start, 0); | |
519 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, | |
520 | failure->start, | |
521 | failure->start + failure->len - 1, | |
522 | EXTENT_DIRTY | EXTENT_LOCKED, | |
523 | GFP_NOFS); | |
524 | kfree(failure); | |
525 | } | |
526 | } | |
07157aac CM |
527 | return 0; |
528 | ||
529 | zeroit: | |
aadfeb6e CM |
530 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
531 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
532 | private); | |
db94535d CM |
533 | memset(kaddr + offset, 1, end - start + 1); |
534 | flush_dcache_page(page); | |
07157aac | 535 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 536 | local_irq_restore(flags); |
7e38326f | 537 | return -EIO; |
07157aac | 538 | } |
b888db2b | 539 | |
39279cc3 CM |
540 | void btrfs_read_locked_inode(struct inode *inode) |
541 | { | |
542 | struct btrfs_path *path; | |
5f39d397 | 543 | struct extent_buffer *leaf; |
39279cc3 | 544 | struct btrfs_inode_item *inode_item; |
0b86a832 | 545 | struct btrfs_timespec *tspec; |
39279cc3 CM |
546 | struct btrfs_root *root = BTRFS_I(inode)->root; |
547 | struct btrfs_key location; | |
548 | u64 alloc_group_block; | |
618e21d5 | 549 | u32 rdev; |
39279cc3 CM |
550 | int ret; |
551 | ||
552 | path = btrfs_alloc_path(); | |
553 | BUG_ON(!path); | |
39279cc3 | 554 | mutex_lock(&root->fs_info->fs_mutex); |
39279cc3 | 555 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 556 | |
39279cc3 | 557 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 558 | if (ret) |
39279cc3 | 559 | goto make_bad; |
39279cc3 | 560 | |
5f39d397 CM |
561 | leaf = path->nodes[0]; |
562 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
563 | struct btrfs_inode_item); | |
564 | ||
565 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
566 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
567 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
568 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
569 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
570 | ||
571 | tspec = btrfs_inode_atime(inode_item); | |
572 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
573 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
574 | ||
575 | tspec = btrfs_inode_mtime(inode_item); | |
576 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
577 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
578 | ||
579 | tspec = btrfs_inode_ctime(inode_item); | |
580 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
581 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
582 | ||
583 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
584 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 585 | inode->i_rdev = 0; |
5f39d397 CM |
586 | rdev = btrfs_inode_rdev(leaf, inode_item); |
587 | ||
588 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
589 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
590 | alloc_group_block); | |
b98b6767 | 591 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
592 | if (!BTRFS_I(inode)->block_group) { |
593 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
0b86a832 CM |
594 | NULL, 0, |
595 | BTRFS_BLOCK_GROUP_METADATA, 0); | |
e52ec0eb | 596 | } |
39279cc3 CM |
597 | btrfs_free_path(path); |
598 | inode_item = NULL; | |
599 | ||
600 | mutex_unlock(&root->fs_info->fs_mutex); | |
601 | ||
602 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
603 | case S_IFREG: |
604 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 605 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 606 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
607 | inode->i_fop = &btrfs_file_operations; |
608 | inode->i_op = &btrfs_file_inode_operations; | |
609 | break; | |
610 | case S_IFDIR: | |
611 | inode->i_fop = &btrfs_dir_file_operations; | |
612 | if (root == root->fs_info->tree_root) | |
613 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
614 | else | |
615 | inode->i_op = &btrfs_dir_inode_operations; | |
616 | break; | |
617 | case S_IFLNK: | |
618 | inode->i_op = &btrfs_symlink_inode_operations; | |
619 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 620 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 621 | break; |
618e21d5 JB |
622 | default: |
623 | init_special_inode(inode, inode->i_mode, rdev); | |
624 | break; | |
39279cc3 CM |
625 | } |
626 | return; | |
627 | ||
628 | make_bad: | |
629 | btrfs_release_path(root, path); | |
630 | btrfs_free_path(path); | |
631 | mutex_unlock(&root->fs_info->fs_mutex); | |
632 | make_bad_inode(inode); | |
633 | } | |
634 | ||
5f39d397 CM |
635 | static void fill_inode_item(struct extent_buffer *leaf, |
636 | struct btrfs_inode_item *item, | |
39279cc3 CM |
637 | struct inode *inode) |
638 | { | |
5f39d397 CM |
639 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
640 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
641 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
642 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
643 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
644 | ||
645 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
646 | inode->i_atime.tv_sec); | |
647 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
648 | inode->i_atime.tv_nsec); | |
649 | ||
650 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
651 | inode->i_mtime.tv_sec); | |
652 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
653 | inode->i_mtime.tv_nsec); | |
654 | ||
655 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
656 | inode->i_ctime.tv_sec); | |
657 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
658 | inode->i_ctime.tv_nsec); | |
659 | ||
660 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
661 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
662 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 663 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 664 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
665 | BTRFS_I(inode)->block_group->key.objectid); |
666 | } | |
667 | ||
a52d9a80 | 668 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
669 | struct btrfs_root *root, |
670 | struct inode *inode) | |
671 | { | |
672 | struct btrfs_inode_item *inode_item; | |
673 | struct btrfs_path *path; | |
5f39d397 | 674 | struct extent_buffer *leaf; |
39279cc3 CM |
675 | int ret; |
676 | ||
677 | path = btrfs_alloc_path(); | |
678 | BUG_ON(!path); | |
39279cc3 CM |
679 | ret = btrfs_lookup_inode(trans, root, path, |
680 | &BTRFS_I(inode)->location, 1); | |
681 | if (ret) { | |
682 | if (ret > 0) | |
683 | ret = -ENOENT; | |
684 | goto failed; | |
685 | } | |
686 | ||
5f39d397 CM |
687 | leaf = path->nodes[0]; |
688 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
689 | struct btrfs_inode_item); |
690 | ||
5f39d397 CM |
691 | fill_inode_item(leaf, inode_item, inode); |
692 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 693 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
694 | ret = 0; |
695 | failed: | |
696 | btrfs_release_path(root, path); | |
697 | btrfs_free_path(path); | |
698 | return ret; | |
699 | } | |
700 | ||
701 | ||
702 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
703 | struct btrfs_root *root, | |
704 | struct inode *dir, | |
705 | struct dentry *dentry) | |
706 | { | |
707 | struct btrfs_path *path; | |
708 | const char *name = dentry->d_name.name; | |
709 | int name_len = dentry->d_name.len; | |
710 | int ret = 0; | |
5f39d397 | 711 | struct extent_buffer *leaf; |
39279cc3 | 712 | struct btrfs_dir_item *di; |
5f39d397 | 713 | struct btrfs_key key; |
39279cc3 CM |
714 | |
715 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
716 | if (!path) { |
717 | ret = -ENOMEM; | |
718 | goto err; | |
719 | } | |
720 | ||
39279cc3 CM |
721 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
722 | name, name_len, -1); | |
723 | if (IS_ERR(di)) { | |
724 | ret = PTR_ERR(di); | |
725 | goto err; | |
726 | } | |
727 | if (!di) { | |
728 | ret = -ENOENT; | |
729 | goto err; | |
730 | } | |
5f39d397 CM |
731 | leaf = path->nodes[0]; |
732 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 733 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
734 | if (ret) |
735 | goto err; | |
39279cc3 CM |
736 | btrfs_release_path(root, path); |
737 | ||
738 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 739 | key.objectid, name, name_len, -1); |
39279cc3 CM |
740 | if (IS_ERR(di)) { |
741 | ret = PTR_ERR(di); | |
742 | goto err; | |
743 | } | |
744 | if (!di) { | |
745 | ret = -ENOENT; | |
746 | goto err; | |
747 | } | |
748 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
749 | |
750 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
751 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
752 | dentry->d_inode->i_ino, | |
753 | dentry->d_parent->d_inode->i_ino); | |
754 | if (ret) { | |
755 | printk("failed to delete reference to %.*s, " | |
756 | "inode %lu parent %lu\n", name_len, name, | |
757 | dentry->d_inode->i_ino, | |
758 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 759 | } |
39279cc3 CM |
760 | err: |
761 | btrfs_free_path(path); | |
762 | if (!ret) { | |
763 | dir->i_size -= name_len * 2; | |
79c44584 | 764 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 765 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
766 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
767 | dentry->d_inode->i_nlink--; | |
768 | #else | |
39279cc3 | 769 | drop_nlink(dentry->d_inode); |
6da6abae | 770 | #endif |
54aa1f4d | 771 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
772 | dir->i_sb->s_dirt = 1; |
773 | } | |
774 | return ret; | |
775 | } | |
776 | ||
777 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
778 | { | |
779 | struct btrfs_root *root; | |
780 | struct btrfs_trans_handle *trans; | |
2da98f00 | 781 | struct inode *inode = dentry->d_inode; |
39279cc3 | 782 | int ret; |
1832a6d5 | 783 | unsigned long nr = 0; |
39279cc3 CM |
784 | |
785 | root = BTRFS_I(dir)->root; | |
786 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
787 | |
788 | ret = btrfs_check_free_space(root, 1, 1); | |
789 | if (ret) | |
790 | goto fail; | |
791 | ||
39279cc3 | 792 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 793 | |
39279cc3 CM |
794 | btrfs_set_trans_block_group(trans, dir); |
795 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 796 | nr = trans->blocks_used; |
5f39d397 | 797 | |
2da98f00 CM |
798 | if (inode->i_nlink == 0) { |
799 | int found; | |
800 | /* if the inode isn't linked anywhere, | |
801 | * we don't need to worry about | |
802 | * data=ordered | |
803 | */ | |
804 | found = btrfs_del_ordered_inode(inode); | |
805 | if (found == 1) { | |
806 | atomic_dec(&inode->i_count); | |
807 | } | |
808 | } | |
809 | ||
39279cc3 | 810 | btrfs_end_transaction(trans, root); |
1832a6d5 | 811 | fail: |
39279cc3 | 812 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 813 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 814 | btrfs_throttle(root); |
39279cc3 CM |
815 | return ret; |
816 | } | |
817 | ||
818 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
819 | { | |
820 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 821 | int err = 0; |
39279cc3 CM |
822 | int ret; |
823 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 824 | struct btrfs_trans_handle *trans; |
1832a6d5 | 825 | unsigned long nr = 0; |
39279cc3 | 826 | |
134d4512 Y |
827 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
828 | return -ENOTEMPTY; | |
829 | ||
39279cc3 | 830 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
831 | ret = btrfs_check_free_space(root, 1, 1); |
832 | if (ret) | |
833 | goto fail; | |
834 | ||
39279cc3 CM |
835 | trans = btrfs_start_transaction(root, 1); |
836 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
837 | |
838 | /* now the directory is empty */ | |
839 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
840 | if (!err) { | |
841 | inode->i_size = 0; | |
842 | } | |
3954401f | 843 | |
d3c2fdcf | 844 | nr = trans->blocks_used; |
39279cc3 | 845 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 846 | fail: |
134d4512 | 847 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 848 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 849 | btrfs_throttle(root); |
3954401f | 850 | |
39279cc3 CM |
851 | if (ret && !err) |
852 | err = ret; | |
853 | return err; | |
854 | } | |
855 | ||
39279cc3 CM |
856 | /* |
857 | * this can truncate away extent items, csum items and directory items. | |
858 | * It starts at a high offset and removes keys until it can't find | |
859 | * any higher than i_size. | |
860 | * | |
861 | * csum items that cross the new i_size are truncated to the new size | |
862 | * as well. | |
863 | */ | |
864 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
865 | struct btrfs_root *root, | |
85e21bac CM |
866 | struct inode *inode, |
867 | u32 min_type) | |
39279cc3 CM |
868 | { |
869 | int ret; | |
870 | struct btrfs_path *path; | |
871 | struct btrfs_key key; | |
5f39d397 | 872 | struct btrfs_key found_key; |
39279cc3 | 873 | u32 found_type; |
5f39d397 | 874 | struct extent_buffer *leaf; |
39279cc3 CM |
875 | struct btrfs_file_extent_item *fi; |
876 | u64 extent_start = 0; | |
db94535d | 877 | u64 extent_num_bytes = 0; |
39279cc3 | 878 | u64 item_end = 0; |
7bb86316 | 879 | u64 root_gen = 0; |
d8d5f3e1 | 880 | u64 root_owner = 0; |
39279cc3 CM |
881 | int found_extent; |
882 | int del_item; | |
85e21bac CM |
883 | int pending_del_nr = 0; |
884 | int pending_del_slot = 0; | |
179e29e4 | 885 | int extent_type = -1; |
39279cc3 | 886 | |
a52d9a80 | 887 | btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1); |
39279cc3 | 888 | path = btrfs_alloc_path(); |
3c69faec | 889 | path->reada = -1; |
39279cc3 | 890 | BUG_ON(!path); |
5f39d397 | 891 | |
39279cc3 CM |
892 | /* FIXME, add redo link to tree so we don't leak on crash */ |
893 | key.objectid = inode->i_ino; | |
894 | key.offset = (u64)-1; | |
5f39d397 CM |
895 | key.type = (u8)-1; |
896 | ||
85e21bac CM |
897 | btrfs_init_path(path); |
898 | search_again: | |
899 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
900 | if (ret < 0) { | |
901 | goto error; | |
902 | } | |
903 | if (ret > 0) { | |
904 | BUG_ON(path->slots[0] == 0); | |
905 | path->slots[0]--; | |
906 | } | |
907 | ||
39279cc3 | 908 | while(1) { |
39279cc3 | 909 | fi = NULL; |
5f39d397 CM |
910 | leaf = path->nodes[0]; |
911 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
912 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 913 | |
5f39d397 | 914 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 915 | break; |
5f39d397 | 916 | |
85e21bac | 917 | if (found_type < min_type) |
39279cc3 CM |
918 | break; |
919 | ||
5f39d397 | 920 | item_end = found_key.offset; |
39279cc3 | 921 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 922 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 923 | struct btrfs_file_extent_item); |
179e29e4 CM |
924 | extent_type = btrfs_file_extent_type(leaf, fi); |
925 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 926 | item_end += |
db94535d | 927 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
928 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
929 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
930 | path->slots[0]); | |
931 | item_end += btrfs_file_extent_inline_len(leaf, | |
932 | item); | |
39279cc3 | 933 | } |
008630c1 | 934 | item_end--; |
39279cc3 CM |
935 | } |
936 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
937 | ret = btrfs_csum_truncate(trans, root, path, | |
938 | inode->i_size); | |
939 | BUG_ON(ret); | |
940 | } | |
008630c1 | 941 | if (item_end < inode->i_size) { |
b888db2b CM |
942 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
943 | found_type = BTRFS_INODE_ITEM_KEY; | |
944 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
945 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
946 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
947 | found_type = BTRFS_XATTR_ITEM_KEY; | |
948 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
949 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
950 | } else if (found_type) { |
951 | found_type--; | |
952 | } else { | |
953 | break; | |
39279cc3 | 954 | } |
a61721d5 | 955 | btrfs_set_key_type(&key, found_type); |
85e21bac | 956 | goto next; |
39279cc3 | 957 | } |
5f39d397 | 958 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
959 | del_item = 1; |
960 | else | |
961 | del_item = 0; | |
962 | found_extent = 0; | |
963 | ||
964 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
965 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
966 | goto delete; | |
967 | ||
968 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 969 | u64 num_dec; |
db94535d | 970 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 971 | if (!del_item) { |
db94535d CM |
972 | u64 orig_num_bytes = |
973 | btrfs_file_extent_num_bytes(leaf, fi); | |
974 | extent_num_bytes = inode->i_size - | |
5f39d397 | 975 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
976 | extent_num_bytes = extent_num_bytes & |
977 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
978 | btrfs_set_file_extent_num_bytes(leaf, fi, |
979 | extent_num_bytes); | |
980 | num_dec = (orig_num_bytes - | |
9069218d CM |
981 | extent_num_bytes); |
982 | if (extent_start != 0) | |
983 | dec_i_blocks(inode, num_dec); | |
5f39d397 | 984 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 985 | } else { |
db94535d CM |
986 | extent_num_bytes = |
987 | btrfs_file_extent_disk_num_bytes(leaf, | |
988 | fi); | |
39279cc3 | 989 | /* FIXME blocksize != 4096 */ |
9069218d | 990 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
991 | if (extent_start != 0) { |
992 | found_extent = 1; | |
9069218d | 993 | dec_i_blocks(inode, num_dec); |
39279cc3 | 994 | } |
d8d5f3e1 CM |
995 | root_gen = btrfs_header_generation(leaf); |
996 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 997 | } |
9069218d CM |
998 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
999 | if (!del_item) { | |
1000 | u32 newsize = inode->i_size - found_key.offset; | |
1001 | dec_i_blocks(inode, item_end + 1 - | |
1002 | found_key.offset - newsize); | |
1003 | newsize = | |
1004 | btrfs_file_extent_calc_inline_size(newsize); | |
1005 | ret = btrfs_truncate_item(trans, root, path, | |
1006 | newsize, 1); | |
1007 | BUG_ON(ret); | |
1008 | } else { | |
1009 | dec_i_blocks(inode, item_end + 1 - | |
1010 | found_key.offset); | |
1011 | } | |
39279cc3 | 1012 | } |
179e29e4 | 1013 | delete: |
39279cc3 | 1014 | if (del_item) { |
85e21bac CM |
1015 | if (!pending_del_nr) { |
1016 | /* no pending yet, add ourselves */ | |
1017 | pending_del_slot = path->slots[0]; | |
1018 | pending_del_nr = 1; | |
1019 | } else if (pending_del_nr && | |
1020 | path->slots[0] + 1 == pending_del_slot) { | |
1021 | /* hop on the pending chunk */ | |
1022 | pending_del_nr++; | |
1023 | pending_del_slot = path->slots[0]; | |
1024 | } else { | |
1025 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
1026 | } | |
39279cc3 CM |
1027 | } else { |
1028 | break; | |
1029 | } | |
39279cc3 CM |
1030 | if (found_extent) { |
1031 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 1032 | extent_num_bytes, |
d8d5f3e1 | 1033 | root_owner, |
7bb86316 CM |
1034 | root_gen, inode->i_ino, |
1035 | found_key.offset, 0); | |
39279cc3 CM |
1036 | BUG_ON(ret); |
1037 | } | |
85e21bac CM |
1038 | next: |
1039 | if (path->slots[0] == 0) { | |
1040 | if (pending_del_nr) | |
1041 | goto del_pending; | |
1042 | btrfs_release_path(root, path); | |
1043 | goto search_again; | |
1044 | } | |
1045 | ||
1046 | path->slots[0]--; | |
1047 | if (pending_del_nr && | |
1048 | path->slots[0] + 1 != pending_del_slot) { | |
1049 | struct btrfs_key debug; | |
1050 | del_pending: | |
1051 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
1052 | pending_del_slot); | |
1053 | ret = btrfs_del_items(trans, root, path, | |
1054 | pending_del_slot, | |
1055 | pending_del_nr); | |
1056 | BUG_ON(ret); | |
1057 | pending_del_nr = 0; | |
1058 | btrfs_release_path(root, path); | |
1059 | goto search_again; | |
1060 | } | |
39279cc3 CM |
1061 | } |
1062 | ret = 0; | |
1063 | error: | |
85e21bac CM |
1064 | if (pending_del_nr) { |
1065 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
1066 | pending_del_nr); | |
1067 | } | |
39279cc3 CM |
1068 | btrfs_release_path(root, path); |
1069 | btrfs_free_path(path); | |
1070 | inode->i_sb->s_dirt = 1; | |
1071 | return ret; | |
1072 | } | |
1073 | ||
b888db2b | 1074 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
1075 | size_t zero_start) |
1076 | { | |
1077 | char *kaddr; | |
d1310b2e | 1078 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
35ebb934 | 1079 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 1080 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 | 1081 | int ret = 0; |
a52d9a80 | 1082 | |
190662b2 | 1083 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 1084 | set_page_extent_mapped(page); |
a52d9a80 | 1085 | |
d1310b2e | 1086 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 1087 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, |
b888db2b | 1088 | page_end, GFP_NOFS); |
1832a6d5 | 1089 | |
a52d9a80 | 1090 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 1091 | kaddr = kmap(page); |
a52d9a80 CM |
1092 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
1093 | flush_dcache_page(page); | |
b888db2b | 1094 | kunmap(page); |
a52d9a80 | 1095 | } |
b888db2b | 1096 | set_page_dirty(page); |
d1310b2e | 1097 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
a52d9a80 | 1098 | |
a52d9a80 CM |
1099 | return ret; |
1100 | } | |
1101 | ||
39279cc3 CM |
1102 | /* |
1103 | * taken from block_truncate_page, but does cow as it zeros out | |
1104 | * any bytes left in the last page in the file. | |
1105 | */ | |
1106 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
1107 | { | |
1108 | struct inode *inode = mapping->host; | |
db94535d CM |
1109 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1110 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
1111 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
1112 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
1113 | struct page *page; | |
39279cc3 | 1114 | int ret = 0; |
a52d9a80 | 1115 | u64 page_start; |
39279cc3 CM |
1116 | |
1117 | if ((offset & (blocksize - 1)) == 0) | |
1118 | goto out; | |
1119 | ||
1120 | ret = -ENOMEM; | |
1121 | page = grab_cache_page(mapping, index); | |
1122 | if (!page) | |
1123 | goto out; | |
39279cc3 | 1124 | if (!PageUptodate(page)) { |
9ebefb18 | 1125 | ret = btrfs_readpage(NULL, page); |
39279cc3 CM |
1126 | lock_page(page); |
1127 | if (!PageUptodate(page)) { | |
1128 | ret = -EIO; | |
1129 | goto out; | |
1130 | } | |
1131 | } | |
35ebb934 | 1132 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 1133 | |
b888db2b | 1134 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 1135 | |
39279cc3 CM |
1136 | unlock_page(page); |
1137 | page_cache_release(page); | |
1138 | out: | |
1139 | return ret; | |
1140 | } | |
1141 | ||
1142 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1143 | { | |
1144 | struct inode *inode = dentry->d_inode; | |
1145 | int err; | |
1146 | ||
1147 | err = inode_change_ok(inode, attr); | |
1148 | if (err) | |
1149 | return err; | |
1150 | ||
1151 | if (S_ISREG(inode->i_mode) && | |
1152 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1153 | struct btrfs_trans_handle *trans; | |
1154 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1155 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1156 | |
5f39d397 | 1157 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1158 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1159 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1160 | u64 hole_size; |
179e29e4 | 1161 | u64 alloc_hint = 0; |
39279cc3 | 1162 | |
1b0f7c29 | 1163 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1164 | goto out; |
1165 | ||
1832a6d5 CM |
1166 | mutex_lock(&root->fs_info->fs_mutex); |
1167 | err = btrfs_check_free_space(root, 1, 0); | |
1168 | mutex_unlock(&root->fs_info->fs_mutex); | |
1169 | if (err) | |
1170 | goto fail; | |
1171 | ||
39279cc3 CM |
1172 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1173 | ||
1b0f7c29 | 1174 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
5f56406a | 1175 | hole_size = block_end - hole_start; |
39279cc3 CM |
1176 | |
1177 | mutex_lock(&root->fs_info->fs_mutex); | |
1178 | trans = btrfs_start_transaction(root, 1); | |
1179 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 1180 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1181 | hole_start, block_end, hole_start, |
3326d1b0 | 1182 | &alloc_hint); |
2bf5a725 | 1183 | |
179e29e4 CM |
1184 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1185 | err = btrfs_insert_file_extent(trans, root, | |
1186 | inode->i_ino, | |
5f56406a CM |
1187 | hole_start, 0, 0, |
1188 | hole_size); | |
d1310b2e CM |
1189 | btrfs_drop_extent_cache(inode, hole_start, |
1190 | hole_size - 1); | |
5f56406a | 1191 | btrfs_check_file(root, inode); |
179e29e4 | 1192 | } |
39279cc3 CM |
1193 | btrfs_end_transaction(trans, root); |
1194 | mutex_unlock(&root->fs_info->fs_mutex); | |
1b0f7c29 | 1195 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1196 | if (err) |
1197 | return err; | |
39279cc3 CM |
1198 | } |
1199 | out: | |
1200 | err = inode_setattr(inode, attr); | |
1832a6d5 | 1201 | fail: |
39279cc3 CM |
1202 | return err; |
1203 | } | |
61295eb8 | 1204 | |
2da98f00 | 1205 | void btrfs_put_inode(struct inode *inode) |
61295eb8 | 1206 | { |
2da98f00 CM |
1207 | int ret; |
1208 | ||
1209 | if (!BTRFS_I(inode)->ordered_trans) { | |
61295eb8 CM |
1210 | return; |
1211 | } | |
2da98f00 CM |
1212 | |
1213 | if (mapping_tagged(inode->i_mapping, PAGECACHE_TAG_DIRTY) || | |
1214 | mapping_tagged(inode->i_mapping, PAGECACHE_TAG_WRITEBACK)) | |
1215 | return; | |
1216 | ||
1217 | ret = btrfs_del_ordered_inode(inode); | |
1218 | if (ret == 1) { | |
1219 | atomic_dec(&inode->i_count); | |
1220 | } | |
61295eb8 CM |
1221 | } |
1222 | ||
39279cc3 CM |
1223 | void btrfs_delete_inode(struct inode *inode) |
1224 | { | |
1225 | struct btrfs_trans_handle *trans; | |
1226 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1227 | unsigned long nr; |
39279cc3 CM |
1228 | int ret; |
1229 | ||
1230 | truncate_inode_pages(&inode->i_data, 0); | |
1231 | if (is_bad_inode(inode)) { | |
1232 | goto no_delete; | |
1233 | } | |
5f39d397 | 1234 | |
39279cc3 CM |
1235 | inode->i_size = 0; |
1236 | mutex_lock(&root->fs_info->fs_mutex); | |
1237 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1238 | |
39279cc3 | 1239 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1240 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
54aa1f4d CM |
1241 | if (ret) |
1242 | goto no_delete_lock; | |
85e21bac | 1243 | |
d3c2fdcf | 1244 | nr = trans->blocks_used; |
85e21bac | 1245 | clear_inode(inode); |
5f39d397 | 1246 | |
39279cc3 CM |
1247 | btrfs_end_transaction(trans, root); |
1248 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1249 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1250 | btrfs_throttle(root); |
39279cc3 | 1251 | return; |
54aa1f4d CM |
1252 | |
1253 | no_delete_lock: | |
d3c2fdcf | 1254 | nr = trans->blocks_used; |
54aa1f4d CM |
1255 | btrfs_end_transaction(trans, root); |
1256 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1257 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1258 | btrfs_throttle(root); |
39279cc3 CM |
1259 | no_delete: |
1260 | clear_inode(inode); | |
1261 | } | |
1262 | ||
1263 | /* | |
1264 | * this returns the key found in the dir entry in the location pointer. | |
1265 | * If no dir entries were found, location->objectid is 0. | |
1266 | */ | |
1267 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1268 | struct btrfs_key *location) | |
1269 | { | |
1270 | const char *name = dentry->d_name.name; | |
1271 | int namelen = dentry->d_name.len; | |
1272 | struct btrfs_dir_item *di; | |
1273 | struct btrfs_path *path; | |
1274 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1275 | int ret = 0; |
39279cc3 | 1276 | |
3954401f CM |
1277 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1278 | location->objectid = dir->i_ino; | |
1279 | location->type = BTRFS_INODE_ITEM_KEY; | |
1280 | location->offset = 0; | |
1281 | return 0; | |
1282 | } | |
39279cc3 CM |
1283 | path = btrfs_alloc_path(); |
1284 | BUG_ON(!path); | |
3954401f | 1285 | |
7a720536 | 1286 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1287 | struct btrfs_key key; |
1288 | struct extent_buffer *leaf; | |
1289 | u32 nritems; | |
1290 | int slot; | |
1291 | ||
1292 | key.objectid = dir->i_ino; | |
1293 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1294 | key.offset = 0; | |
1295 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1296 | BUG_ON(ret == 0); | |
1297 | ret = 0; | |
1298 | ||
1299 | leaf = path->nodes[0]; | |
1300 | slot = path->slots[0]; | |
1301 | nritems = btrfs_header_nritems(leaf); | |
1302 | if (slot >= nritems) | |
1303 | goto out_err; | |
1304 | ||
1305 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1306 | if (key.objectid != dir->i_ino || | |
1307 | key.type != BTRFS_INODE_REF_KEY) { | |
1308 | goto out_err; | |
1309 | } | |
1310 | location->objectid = key.offset; | |
1311 | location->type = BTRFS_INODE_ITEM_KEY; | |
1312 | location->offset = 0; | |
1313 | goto out; | |
1314 | } | |
1315 | ||
39279cc3 CM |
1316 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1317 | namelen, 0); | |
0d9f7f3e Y |
1318 | if (IS_ERR(di)) |
1319 | ret = PTR_ERR(di); | |
39279cc3 | 1320 | if (!di || IS_ERR(di)) { |
3954401f | 1321 | goto out_err; |
39279cc3 | 1322 | } |
5f39d397 | 1323 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1324 | out: |
39279cc3 CM |
1325 | btrfs_free_path(path); |
1326 | return ret; | |
3954401f CM |
1327 | out_err: |
1328 | location->objectid = 0; | |
1329 | goto out; | |
39279cc3 CM |
1330 | } |
1331 | ||
1332 | /* | |
1333 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1334 | * needs to be changed to reflect the root directory of the tree root. This | |
1335 | * is kind of like crossing a mount point. | |
1336 | */ | |
1337 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1338 | struct btrfs_key *location, | |
58176a96 JB |
1339 | struct btrfs_root **sub_root, |
1340 | struct dentry *dentry) | |
39279cc3 CM |
1341 | { |
1342 | struct btrfs_path *path; | |
1343 | struct btrfs_root_item *ri; | |
1344 | ||
1345 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1346 | return 0; | |
1347 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1348 | return 0; | |
1349 | ||
1350 | path = btrfs_alloc_path(); | |
1351 | BUG_ON(!path); | |
1352 | mutex_lock(&root->fs_info->fs_mutex); | |
1353 | ||
58176a96 JB |
1354 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1355 | dentry->d_name.name, | |
1356 | dentry->d_name.len); | |
39279cc3 CM |
1357 | if (IS_ERR(*sub_root)) |
1358 | return PTR_ERR(*sub_root); | |
1359 | ||
1360 | ri = &(*sub_root)->root_item; | |
1361 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1362 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1363 | location->offset = 0; | |
1364 | ||
1365 | btrfs_free_path(path); | |
1366 | mutex_unlock(&root->fs_info->fs_mutex); | |
1367 | return 0; | |
1368 | } | |
1369 | ||
1370 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1371 | { | |
1372 | struct btrfs_iget_args *args = p; | |
1373 | inode->i_ino = args->ino; | |
1374 | BTRFS_I(inode)->root = args->root; | |
9069218d | 1375 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e CM |
1376 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1377 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1378 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1379 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1380 | inode->i_mapping, GFP_NOFS); | |
39279cc3 CM |
1381 | return 0; |
1382 | } | |
1383 | ||
1384 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1385 | { | |
1386 | struct btrfs_iget_args *args = opaque; | |
1387 | return (args->ino == inode->i_ino && | |
1388 | args->root == BTRFS_I(inode)->root); | |
1389 | } | |
1390 | ||
dc17ff8f CM |
1391 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1392 | u64 root_objectid) | |
1393 | { | |
1394 | struct btrfs_iget_args args; | |
1395 | args.ino = objectid; | |
1396 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1397 | ||
1398 | if (!args.root) | |
1399 | return NULL; | |
1400 | ||
1401 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1402 | } | |
1403 | ||
39279cc3 CM |
1404 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1405 | struct btrfs_root *root) | |
1406 | { | |
1407 | struct inode *inode; | |
1408 | struct btrfs_iget_args args; | |
1409 | args.ino = objectid; | |
1410 | args.root = root; | |
1411 | ||
1412 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1413 | btrfs_init_locked_inode, | |
1414 | (void *)&args); | |
1415 | return inode; | |
1416 | } | |
1417 | ||
1418 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1419 | struct nameidata *nd) | |
1420 | { | |
1421 | struct inode * inode; | |
1422 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1423 | struct btrfs_root *root = bi->root; | |
1424 | struct btrfs_root *sub_root = root; | |
1425 | struct btrfs_key location; | |
1426 | int ret; | |
1427 | ||
1428 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1429 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1430 | |
39279cc3 CM |
1431 | mutex_lock(&root->fs_info->fs_mutex); |
1432 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1433 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1434 | |
39279cc3 CM |
1435 | if (ret < 0) |
1436 | return ERR_PTR(ret); | |
5f39d397 | 1437 | |
39279cc3 CM |
1438 | inode = NULL; |
1439 | if (location.objectid) { | |
58176a96 JB |
1440 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1441 | dentry); | |
39279cc3 CM |
1442 | if (ret < 0) |
1443 | return ERR_PTR(ret); | |
1444 | if (ret > 0) | |
1445 | return ERR_PTR(-ENOENT); | |
1446 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1447 | sub_root); | |
1448 | if (!inode) | |
1449 | return ERR_PTR(-EACCES); | |
1450 | if (inode->i_state & I_NEW) { | |
1451 | /* the inode and parent dir are two different roots */ | |
1452 | if (sub_root != root) { | |
1453 | igrab(inode); | |
1454 | sub_root->inode = inode; | |
1455 | } | |
1456 | BTRFS_I(inode)->root = sub_root; | |
1457 | memcpy(&BTRFS_I(inode)->location, &location, | |
1458 | sizeof(location)); | |
1459 | btrfs_read_locked_inode(inode); | |
1460 | unlock_new_inode(inode); | |
1461 | } | |
1462 | } | |
1463 | return d_splice_alias(inode, dentry); | |
1464 | } | |
1465 | ||
39279cc3 CM |
1466 | static unsigned char btrfs_filetype_table[] = { |
1467 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1468 | }; | |
1469 | ||
1470 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1471 | { | |
6da6abae | 1472 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1473 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1474 | struct btrfs_item *item; | |
1475 | struct btrfs_dir_item *di; | |
1476 | struct btrfs_key key; | |
5f39d397 | 1477 | struct btrfs_key found_key; |
39279cc3 CM |
1478 | struct btrfs_path *path; |
1479 | int ret; | |
1480 | u32 nritems; | |
5f39d397 | 1481 | struct extent_buffer *leaf; |
39279cc3 CM |
1482 | int slot; |
1483 | int advance; | |
1484 | unsigned char d_type; | |
1485 | int over = 0; | |
1486 | u32 di_cur; | |
1487 | u32 di_total; | |
1488 | u32 di_len; | |
1489 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1490 | char tmp_name[32]; |
1491 | char *name_ptr; | |
1492 | int name_len; | |
39279cc3 CM |
1493 | |
1494 | /* FIXME, use a real flag for deciding about the key type */ | |
1495 | if (root->fs_info->tree_root == root) | |
1496 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1497 | |
3954401f CM |
1498 | /* special case for "." */ |
1499 | if (filp->f_pos == 0) { | |
1500 | over = filldir(dirent, ".", 1, | |
1501 | 1, inode->i_ino, | |
1502 | DT_DIR); | |
1503 | if (over) | |
1504 | return 0; | |
1505 | filp->f_pos = 1; | |
1506 | } | |
1507 | ||
39279cc3 CM |
1508 | mutex_lock(&root->fs_info->fs_mutex); |
1509 | key.objectid = inode->i_ino; | |
3954401f CM |
1510 | path = btrfs_alloc_path(); |
1511 | path->reada = 2; | |
1512 | ||
1513 | /* special case for .., just use the back ref */ | |
1514 | if (filp->f_pos == 1) { | |
1515 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1516 | key.offset = 0; | |
1517 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1518 | BUG_ON(ret == 0); | |
1519 | leaf = path->nodes[0]; | |
1520 | slot = path->slots[0]; | |
1521 | nritems = btrfs_header_nritems(leaf); | |
1522 | if (slot >= nritems) { | |
1523 | btrfs_release_path(root, path); | |
1524 | goto read_dir_items; | |
1525 | } | |
1526 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1527 | btrfs_release_path(root, path); | |
1528 | if (found_key.objectid != key.objectid || | |
1529 | found_key.type != BTRFS_INODE_REF_KEY) | |
1530 | goto read_dir_items; | |
1531 | over = filldir(dirent, "..", 2, | |
1532 | 2, found_key.offset, DT_DIR); | |
1533 | if (over) | |
1534 | goto nopos; | |
1535 | filp->f_pos = 2; | |
1536 | } | |
1537 | ||
1538 | read_dir_items: | |
39279cc3 CM |
1539 | btrfs_set_key_type(&key, key_type); |
1540 | key.offset = filp->f_pos; | |
5f39d397 | 1541 | |
39279cc3 CM |
1542 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1543 | if (ret < 0) | |
1544 | goto err; | |
1545 | advance = 0; | |
39279cc3 | 1546 | while(1) { |
5f39d397 CM |
1547 | leaf = path->nodes[0]; |
1548 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1549 | slot = path->slots[0]; |
1550 | if (advance || slot >= nritems) { | |
1551 | if (slot >= nritems -1) { | |
39279cc3 CM |
1552 | ret = btrfs_next_leaf(root, path); |
1553 | if (ret) | |
1554 | break; | |
5f39d397 CM |
1555 | leaf = path->nodes[0]; |
1556 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1557 | slot = path->slots[0]; |
1558 | } else { | |
1559 | slot++; | |
1560 | path->slots[0]++; | |
1561 | } | |
1562 | } | |
1563 | advance = 1; | |
5f39d397 CM |
1564 | item = btrfs_item_nr(leaf, slot); |
1565 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1566 | ||
1567 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1568 | break; |
5f39d397 | 1569 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1570 | break; |
5f39d397 | 1571 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1572 | continue; |
5f39d397 CM |
1573 | |
1574 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1575 | advance = 1; |
1576 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1577 | di_cur = 0; | |
5f39d397 | 1578 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1579 | while(di_cur < di_total) { |
5f39d397 CM |
1580 | struct btrfs_key location; |
1581 | ||
1582 | name_len = btrfs_dir_name_len(leaf, di); | |
1583 | if (name_len < 32) { | |
1584 | name_ptr = tmp_name; | |
1585 | } else { | |
1586 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1587 | BUG_ON(!name_ptr); | |
1588 | } | |
1589 | read_extent_buffer(leaf, name_ptr, | |
1590 | (unsigned long)(di + 1), name_len); | |
1591 | ||
1592 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1593 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1594 | over = filldir(dirent, name_ptr, name_len, |
1595 | found_key.offset, | |
1596 | location.objectid, | |
39279cc3 | 1597 | d_type); |
5f39d397 CM |
1598 | |
1599 | if (name_ptr != tmp_name) | |
1600 | kfree(name_ptr); | |
1601 | ||
39279cc3 CM |
1602 | if (over) |
1603 | goto nopos; | |
5103e947 JB |
1604 | di_len = btrfs_dir_name_len(leaf, di) + |
1605 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1606 | di_cur += di_len; |
1607 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1608 | } | |
1609 | } | |
5e591a07 YZ |
1610 | if (key_type == BTRFS_DIR_INDEX_KEY) |
1611 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
1612 | else | |
1613 | filp->f_pos++; | |
39279cc3 CM |
1614 | nopos: |
1615 | ret = 0; | |
1616 | err: | |
1617 | btrfs_release_path(root, path); | |
1618 | btrfs_free_path(path); | |
1619 | mutex_unlock(&root->fs_info->fs_mutex); | |
1620 | return ret; | |
1621 | } | |
1622 | ||
1623 | int btrfs_write_inode(struct inode *inode, int wait) | |
1624 | { | |
1625 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1626 | struct btrfs_trans_handle *trans; | |
1627 | int ret = 0; | |
1628 | ||
1629 | if (wait) { | |
1630 | mutex_lock(&root->fs_info->fs_mutex); | |
1631 | trans = btrfs_start_transaction(root, 1); | |
1632 | btrfs_set_trans_block_group(trans, inode); | |
1633 | ret = btrfs_commit_transaction(trans, root); | |
1634 | mutex_unlock(&root->fs_info->fs_mutex); | |
1635 | } | |
1636 | return ret; | |
1637 | } | |
1638 | ||
1639 | /* | |
54aa1f4d | 1640 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1641 | * inode changes. But, it is most likely to find the inode in cache. |
1642 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1643 | * to keep or drop this code. | |
1644 | */ | |
1645 | void btrfs_dirty_inode(struct inode *inode) | |
1646 | { | |
1647 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1648 | struct btrfs_trans_handle *trans; | |
1649 | ||
1650 | mutex_lock(&root->fs_info->fs_mutex); | |
1651 | trans = btrfs_start_transaction(root, 1); | |
1652 | btrfs_set_trans_block_group(trans, inode); | |
1653 | btrfs_update_inode(trans, root, inode); | |
1654 | btrfs_end_transaction(trans, root); | |
1655 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1656 | } |
1657 | ||
1658 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1659 | struct btrfs_root *root, | |
9c58309d CM |
1660 | const char *name, int name_len, |
1661 | u64 ref_objectid, | |
39279cc3 CM |
1662 | u64 objectid, |
1663 | struct btrfs_block_group_cache *group, | |
1664 | int mode) | |
1665 | { | |
1666 | struct inode *inode; | |
5f39d397 | 1667 | struct btrfs_inode_item *inode_item; |
6324fbf3 | 1668 | struct btrfs_block_group_cache *new_inode_group; |
39279cc3 | 1669 | struct btrfs_key *location; |
5f39d397 | 1670 | struct btrfs_path *path; |
9c58309d CM |
1671 | struct btrfs_inode_ref *ref; |
1672 | struct btrfs_key key[2]; | |
1673 | u32 sizes[2]; | |
1674 | unsigned long ptr; | |
39279cc3 CM |
1675 | int ret; |
1676 | int owner; | |
1677 | ||
5f39d397 CM |
1678 | path = btrfs_alloc_path(); |
1679 | BUG_ON(!path); | |
1680 | ||
39279cc3 CM |
1681 | inode = new_inode(root->fs_info->sb); |
1682 | if (!inode) | |
1683 | return ERR_PTR(-ENOMEM); | |
1684 | ||
d1310b2e CM |
1685 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1686 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1687 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1688 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1689 | inode->i_mapping, GFP_NOFS); | |
9069218d | 1690 | BTRFS_I(inode)->delalloc_bytes = 0; |
39279cc3 | 1691 | BTRFS_I(inode)->root = root; |
b888db2b | 1692 | |
39279cc3 CM |
1693 | if (mode & S_IFDIR) |
1694 | owner = 0; | |
1695 | else | |
1696 | owner = 1; | |
6324fbf3 | 1697 | new_inode_group = btrfs_find_block_group(root, group, 0, |
0b86a832 | 1698 | BTRFS_BLOCK_GROUP_METADATA, owner); |
6324fbf3 CM |
1699 | if (!new_inode_group) { |
1700 | printk("find_block group failed\n"); | |
1701 | new_inode_group = group; | |
1702 | } | |
1703 | BTRFS_I(inode)->block_group = new_inode_group; | |
b98b6767 | 1704 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
1705 | |
1706 | key[0].objectid = objectid; | |
1707 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
1708 | key[0].offset = 0; | |
1709 | ||
1710 | key[1].objectid = objectid; | |
1711 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
1712 | key[1].offset = ref_objectid; | |
1713 | ||
1714 | sizes[0] = sizeof(struct btrfs_inode_item); | |
1715 | sizes[1] = name_len + sizeof(*ref); | |
1716 | ||
1717 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
1718 | if (ret != 0) | |
5f39d397 CM |
1719 | goto fail; |
1720 | ||
9c58309d CM |
1721 | if (objectid > root->highest_inode) |
1722 | root->highest_inode = objectid; | |
1723 | ||
39279cc3 CM |
1724 | inode->i_uid = current->fsuid; |
1725 | inode->i_gid = current->fsgid; | |
1726 | inode->i_mode = mode; | |
1727 | inode->i_ino = objectid; | |
1728 | inode->i_blocks = 0; | |
1729 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1730 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1731 | struct btrfs_inode_item); | |
1732 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
1733 | |
1734 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
1735 | struct btrfs_inode_ref); | |
1736 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
1737 | ptr = (unsigned long)(ref + 1); | |
1738 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
1739 | ||
5f39d397 CM |
1740 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1741 | btrfs_free_path(path); | |
1742 | ||
39279cc3 CM |
1743 | location = &BTRFS_I(inode)->location; |
1744 | location->objectid = objectid; | |
39279cc3 CM |
1745 | location->offset = 0; |
1746 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1747 | ||
39279cc3 CM |
1748 | insert_inode_hash(inode); |
1749 | return inode; | |
5f39d397 CM |
1750 | fail: |
1751 | btrfs_free_path(path); | |
1752 | return ERR_PTR(ret); | |
39279cc3 CM |
1753 | } |
1754 | ||
1755 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1756 | { | |
1757 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1758 | } | |
1759 | ||
1760 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1761 | struct dentry *dentry, struct inode *inode, |
1762 | int add_backref) | |
39279cc3 CM |
1763 | { |
1764 | int ret; | |
1765 | struct btrfs_key key; | |
1766 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1767 | struct inode *parent_inode; |
5f39d397 | 1768 | |
39279cc3 | 1769 | key.objectid = inode->i_ino; |
39279cc3 CM |
1770 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1771 | key.offset = 0; | |
1772 | ||
1773 | ret = btrfs_insert_dir_item(trans, root, | |
1774 | dentry->d_name.name, dentry->d_name.len, | |
1775 | dentry->d_parent->d_inode->i_ino, | |
1776 | &key, btrfs_inode_type(inode)); | |
1777 | if (ret == 0) { | |
9c58309d CM |
1778 | if (add_backref) { |
1779 | ret = btrfs_insert_inode_ref(trans, root, | |
1780 | dentry->d_name.name, | |
1781 | dentry->d_name.len, | |
1782 | inode->i_ino, | |
1783 | dentry->d_parent->d_inode->i_ino); | |
1784 | } | |
79c44584 CM |
1785 | parent_inode = dentry->d_parent->d_inode; |
1786 | parent_inode->i_size += dentry->d_name.len * 2; | |
1787 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1788 | ret = btrfs_update_inode(trans, root, |
1789 | dentry->d_parent->d_inode); | |
1790 | } | |
1791 | return ret; | |
1792 | } | |
1793 | ||
1794 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1795 | struct dentry *dentry, struct inode *inode, |
1796 | int backref) | |
39279cc3 | 1797 | { |
9c58309d | 1798 | int err = btrfs_add_link(trans, dentry, inode, backref); |
39279cc3 CM |
1799 | if (!err) { |
1800 | d_instantiate(dentry, inode); | |
1801 | return 0; | |
1802 | } | |
1803 | if (err > 0) | |
1804 | err = -EEXIST; | |
1805 | return err; | |
1806 | } | |
1807 | ||
618e21d5 JB |
1808 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1809 | int mode, dev_t rdev) | |
1810 | { | |
1811 | struct btrfs_trans_handle *trans; | |
1812 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1813 | struct inode *inode = NULL; |
618e21d5 JB |
1814 | int err; |
1815 | int drop_inode = 0; | |
1816 | u64 objectid; | |
1832a6d5 | 1817 | unsigned long nr = 0; |
618e21d5 JB |
1818 | |
1819 | if (!new_valid_dev(rdev)) | |
1820 | return -EINVAL; | |
1821 | ||
1822 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1823 | err = btrfs_check_free_space(root, 1, 0); |
1824 | if (err) | |
1825 | goto fail; | |
1826 | ||
618e21d5 JB |
1827 | trans = btrfs_start_transaction(root, 1); |
1828 | btrfs_set_trans_block_group(trans, dir); | |
1829 | ||
1830 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1831 | if (err) { | |
1832 | err = -ENOSPC; | |
1833 | goto out_unlock; | |
1834 | } | |
1835 | ||
9c58309d CM |
1836 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1837 | dentry->d_name.len, | |
1838 | dentry->d_parent->d_inode->i_ino, objectid, | |
618e21d5 JB |
1839 | BTRFS_I(dir)->block_group, mode); |
1840 | err = PTR_ERR(inode); | |
1841 | if (IS_ERR(inode)) | |
1842 | goto out_unlock; | |
1843 | ||
1844 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1845 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
618e21d5 JB |
1846 | if (err) |
1847 | drop_inode = 1; | |
1848 | else { | |
1849 | inode->i_op = &btrfs_special_inode_operations; | |
1850 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1851 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1852 | } |
1853 | dir->i_sb->s_dirt = 1; | |
1854 | btrfs_update_inode_block_group(trans, inode); | |
1855 | btrfs_update_inode_block_group(trans, dir); | |
1856 | out_unlock: | |
d3c2fdcf | 1857 | nr = trans->blocks_used; |
618e21d5 | 1858 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1859 | fail: |
618e21d5 JB |
1860 | mutex_unlock(&root->fs_info->fs_mutex); |
1861 | ||
1862 | if (drop_inode) { | |
1863 | inode_dec_link_count(inode); | |
1864 | iput(inode); | |
1865 | } | |
d3c2fdcf | 1866 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1867 | btrfs_throttle(root); |
618e21d5 JB |
1868 | return err; |
1869 | } | |
1870 | ||
39279cc3 CM |
1871 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1872 | int mode, struct nameidata *nd) | |
1873 | { | |
1874 | struct btrfs_trans_handle *trans; | |
1875 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1876 | struct inode *inode = NULL; |
39279cc3 CM |
1877 | int err; |
1878 | int drop_inode = 0; | |
1832a6d5 | 1879 | unsigned long nr = 0; |
39279cc3 CM |
1880 | u64 objectid; |
1881 | ||
1882 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1883 | err = btrfs_check_free_space(root, 1, 0); |
1884 | if (err) | |
1885 | goto fail; | |
39279cc3 CM |
1886 | trans = btrfs_start_transaction(root, 1); |
1887 | btrfs_set_trans_block_group(trans, dir); | |
1888 | ||
1889 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1890 | if (err) { | |
1891 | err = -ENOSPC; | |
1892 | goto out_unlock; | |
1893 | } | |
1894 | ||
9c58309d CM |
1895 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1896 | dentry->d_name.len, | |
1897 | dentry->d_parent->d_inode->i_ino, | |
1898 | objectid, BTRFS_I(dir)->block_group, mode); | |
39279cc3 CM |
1899 | err = PTR_ERR(inode); |
1900 | if (IS_ERR(inode)) | |
1901 | goto out_unlock; | |
1902 | ||
1903 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1904 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
1905 | if (err) |
1906 | drop_inode = 1; | |
1907 | else { | |
1908 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 1909 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
1910 | inode->i_fop = &btrfs_file_operations; |
1911 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
1912 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1913 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 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); | |
9069218d | 1917 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e | 1918 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1919 | } |
1920 | dir->i_sb->s_dirt = 1; | |
1921 | btrfs_update_inode_block_group(trans, inode); | |
1922 | btrfs_update_inode_block_group(trans, dir); | |
1923 | out_unlock: | |
d3c2fdcf | 1924 | nr = trans->blocks_used; |
39279cc3 | 1925 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1926 | fail: |
39279cc3 CM |
1927 | mutex_unlock(&root->fs_info->fs_mutex); |
1928 | ||
1929 | if (drop_inode) { | |
1930 | inode_dec_link_count(inode); | |
1931 | iput(inode); | |
1932 | } | |
d3c2fdcf | 1933 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1934 | btrfs_throttle(root); |
39279cc3 CM |
1935 | return err; |
1936 | } | |
1937 | ||
1938 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1939 | struct dentry *dentry) | |
1940 | { | |
1941 | struct btrfs_trans_handle *trans; | |
1942 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1943 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1944 | unsigned long nr = 0; |
39279cc3 CM |
1945 | int err; |
1946 | int drop_inode = 0; | |
1947 | ||
1948 | if (inode->i_nlink == 0) | |
1949 | return -ENOENT; | |
1950 | ||
6da6abae CM |
1951 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1952 | inode->i_nlink++; | |
1953 | #else | |
39279cc3 | 1954 | inc_nlink(inode); |
6da6abae | 1955 | #endif |
39279cc3 | 1956 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
1957 | err = btrfs_check_free_space(root, 1, 0); |
1958 | if (err) | |
1959 | goto fail; | |
39279cc3 | 1960 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1961 | |
39279cc3 CM |
1962 | btrfs_set_trans_block_group(trans, dir); |
1963 | atomic_inc(&inode->i_count); | |
9c58309d | 1964 | err = btrfs_add_nondir(trans, dentry, inode, 1); |
5f39d397 | 1965 | |
39279cc3 CM |
1966 | if (err) |
1967 | drop_inode = 1; | |
5f39d397 | 1968 | |
39279cc3 CM |
1969 | dir->i_sb->s_dirt = 1; |
1970 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 1971 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 1972 | |
54aa1f4d CM |
1973 | if (err) |
1974 | drop_inode = 1; | |
39279cc3 | 1975 | |
d3c2fdcf | 1976 | nr = trans->blocks_used; |
39279cc3 | 1977 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1978 | fail: |
39279cc3 CM |
1979 | mutex_unlock(&root->fs_info->fs_mutex); |
1980 | ||
1981 | if (drop_inode) { | |
1982 | inode_dec_link_count(inode); | |
1983 | iput(inode); | |
1984 | } | |
d3c2fdcf | 1985 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1986 | btrfs_throttle(root); |
39279cc3 CM |
1987 | return err; |
1988 | } | |
1989 | ||
39279cc3 CM |
1990 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
1991 | { | |
1992 | struct inode *inode; | |
1993 | struct btrfs_trans_handle *trans; | |
1994 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1995 | int err = 0; | |
1996 | int drop_on_err = 0; | |
1997 | u64 objectid; | |
d3c2fdcf | 1998 | unsigned long nr = 1; |
39279cc3 CM |
1999 | |
2000 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2001 | err = btrfs_check_free_space(root, 1, 0); |
2002 | if (err) | |
2003 | goto out_unlock; | |
2004 | ||
39279cc3 CM |
2005 | trans = btrfs_start_transaction(root, 1); |
2006 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 2007 | |
39279cc3 CM |
2008 | if (IS_ERR(trans)) { |
2009 | err = PTR_ERR(trans); | |
2010 | goto out_unlock; | |
2011 | } | |
2012 | ||
2013 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2014 | if (err) { | |
2015 | err = -ENOSPC; | |
2016 | goto out_unlock; | |
2017 | } | |
2018 | ||
9c58309d CM |
2019 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2020 | dentry->d_name.len, | |
2021 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2022 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
2023 | if (IS_ERR(inode)) { | |
2024 | err = PTR_ERR(inode); | |
2025 | goto out_fail; | |
2026 | } | |
5f39d397 | 2027 | |
39279cc3 CM |
2028 | drop_on_err = 1; |
2029 | inode->i_op = &btrfs_dir_inode_operations; | |
2030 | inode->i_fop = &btrfs_dir_file_operations; | |
2031 | btrfs_set_trans_block_group(trans, inode); | |
2032 | ||
3954401f | 2033 | inode->i_size = 0; |
39279cc3 CM |
2034 | err = btrfs_update_inode(trans, root, inode); |
2035 | if (err) | |
2036 | goto out_fail; | |
5f39d397 | 2037 | |
9c58309d | 2038 | err = btrfs_add_link(trans, dentry, inode, 0); |
39279cc3 CM |
2039 | if (err) |
2040 | goto out_fail; | |
5f39d397 | 2041 | |
39279cc3 CM |
2042 | d_instantiate(dentry, inode); |
2043 | drop_on_err = 0; | |
2044 | dir->i_sb->s_dirt = 1; | |
2045 | btrfs_update_inode_block_group(trans, inode); | |
2046 | btrfs_update_inode_block_group(trans, dir); | |
2047 | ||
2048 | out_fail: | |
d3c2fdcf | 2049 | nr = trans->blocks_used; |
39279cc3 | 2050 | btrfs_end_transaction(trans, root); |
5f39d397 | 2051 | |
39279cc3 CM |
2052 | out_unlock: |
2053 | mutex_unlock(&root->fs_info->fs_mutex); | |
2054 | if (drop_on_err) | |
2055 | iput(inode); | |
d3c2fdcf | 2056 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2057 | btrfs_throttle(root); |
39279cc3 CM |
2058 | return err; |
2059 | } | |
2060 | ||
a52d9a80 | 2061 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 2062 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
2063 | int create) |
2064 | { | |
2065 | int ret; | |
2066 | int err = 0; | |
db94535d | 2067 | u64 bytenr; |
a52d9a80 CM |
2068 | u64 extent_start = 0; |
2069 | u64 extent_end = 0; | |
2070 | u64 objectid = inode->i_ino; | |
2071 | u32 found_type; | |
a52d9a80 CM |
2072 | struct btrfs_path *path; |
2073 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2074 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
2075 | struct extent_buffer *leaf; |
2076 | struct btrfs_key found_key; | |
a52d9a80 CM |
2077 | struct extent_map *em = NULL; |
2078 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 2079 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
2080 | struct btrfs_trans_handle *trans = NULL; |
2081 | ||
2082 | path = btrfs_alloc_path(); | |
2083 | BUG_ON(!path); | |
2084 | mutex_lock(&root->fs_info->fs_mutex); | |
2085 | ||
2086 | again: | |
d1310b2e CM |
2087 | spin_lock(&em_tree->lock); |
2088 | em = lookup_extent_mapping(em_tree, start, len); | |
2089 | spin_unlock(&em_tree->lock); | |
2090 | ||
a52d9a80 | 2091 | if (em) { |
56b453c9 | 2092 | if (em->start > start) { |
d1310b2e CM |
2093 | printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n", |
2094 | start, len, em->start, em->len); | |
56b453c9 CM |
2095 | WARN_ON(1); |
2096 | } | |
70dec807 CM |
2097 | if (em->block_start == EXTENT_MAP_INLINE && page) |
2098 | free_extent_map(em); | |
2099 | else | |
2100 | goto out; | |
a52d9a80 | 2101 | } |
d1310b2e | 2102 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 2103 | if (!em) { |
d1310b2e CM |
2104 | err = -ENOMEM; |
2105 | goto out; | |
a52d9a80 | 2106 | } |
d1310b2e CM |
2107 | |
2108 | em->start = EXTENT_MAP_HOLE; | |
2109 | em->len = (u64)-1; | |
a52d9a80 | 2110 | em->bdev = inode->i_sb->s_bdev; |
179e29e4 CM |
2111 | ret = btrfs_lookup_file_extent(trans, root, path, |
2112 | objectid, start, trans != NULL); | |
a52d9a80 CM |
2113 | if (ret < 0) { |
2114 | err = ret; | |
2115 | goto out; | |
2116 | } | |
2117 | ||
2118 | if (ret != 0) { | |
2119 | if (path->slots[0] == 0) | |
2120 | goto not_found; | |
2121 | path->slots[0]--; | |
2122 | } | |
2123 | ||
5f39d397 CM |
2124 | leaf = path->nodes[0]; |
2125 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 2126 | struct btrfs_file_extent_item); |
a52d9a80 | 2127 | /* are we inside the extent that was found? */ |
5f39d397 CM |
2128 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2129 | found_type = btrfs_key_type(&found_key); | |
2130 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
2131 | found_type != BTRFS_EXTENT_DATA_KEY) { |
2132 | goto not_found; | |
2133 | } | |
2134 | ||
5f39d397 CM |
2135 | found_type = btrfs_file_extent_type(leaf, item); |
2136 | extent_start = found_key.offset; | |
a52d9a80 CM |
2137 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
2138 | extent_end = extent_start + | |
db94535d | 2139 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 2140 | err = 0; |
b888db2b | 2141 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2142 | em->start = start; |
2143 | if (start < extent_start) { | |
d1310b2e | 2144 | if (start + len <= extent_start) |
b888db2b | 2145 | goto not_found; |
d1310b2e | 2146 | em->len = extent_end - extent_start; |
a52d9a80 | 2147 | } else { |
d1310b2e | 2148 | em->len = len; |
a52d9a80 CM |
2149 | } |
2150 | goto not_found_em; | |
2151 | } | |
db94535d CM |
2152 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2153 | if (bytenr == 0) { | |
a52d9a80 | 2154 | em->start = extent_start; |
d1310b2e | 2155 | em->len = extent_end - extent_start; |
5f39d397 | 2156 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2157 | goto insert; |
2158 | } | |
db94535d CM |
2159 | bytenr += btrfs_file_extent_offset(leaf, item); |
2160 | em->block_start = bytenr; | |
a52d9a80 | 2161 | em->start = extent_start; |
d1310b2e | 2162 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2163 | goto insert; |
2164 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2165 | u64 page_start; |
5f39d397 | 2166 | unsigned long ptr; |
a52d9a80 | 2167 | char *map; |
3326d1b0 CM |
2168 | size_t size; |
2169 | size_t extent_offset; | |
2170 | size_t copy_size; | |
a52d9a80 | 2171 | |
5f39d397 CM |
2172 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2173 | path->slots[0])); | |
d1310b2e CM |
2174 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2175 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2176 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2177 | em->start = start; |
2178 | if (start < extent_start) { | |
d1310b2e | 2179 | if (start + len <= extent_start) |
b888db2b | 2180 | goto not_found; |
d1310b2e | 2181 | em->len = extent_end - extent_start; |
a52d9a80 | 2182 | } else { |
d1310b2e | 2183 | em->len = len; |
a52d9a80 CM |
2184 | } |
2185 | goto not_found_em; | |
2186 | } | |
689f9346 | 2187 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2188 | |
2189 | if (!page) { | |
2190 | em->start = extent_start; | |
d1310b2e | 2191 | em->len = size; |
689f9346 Y |
2192 | goto out; |
2193 | } | |
5f39d397 | 2194 | |
70dec807 CM |
2195 | page_start = page_offset(page) + pg_offset; |
2196 | extent_offset = page_start - extent_start; | |
2197 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2198 | size - extent_offset); |
3326d1b0 | 2199 | em->start = extent_start + extent_offset; |
70dec807 CM |
2200 | em->len = (copy_size + root->sectorsize - 1) & |
2201 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2202 | map = kmap(page); |
2203 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2204 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2205 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2206 | copy_size); |
2207 | flush_dcache_page(page); | |
2208 | } else if (create && PageUptodate(page)) { | |
2209 | if (!trans) { | |
2210 | kunmap(page); | |
2211 | free_extent_map(em); | |
2212 | em = NULL; | |
2213 | btrfs_release_path(root, path); | |
2214 | trans = btrfs_start_transaction(root, 1); | |
2215 | goto again; | |
2216 | } | |
70dec807 | 2217 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2218 | copy_size); |
2219 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2220 | } |
a52d9a80 | 2221 | kunmap(page); |
d1310b2e CM |
2222 | set_extent_uptodate(io_tree, em->start, |
2223 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2224 | goto insert; |
2225 | } else { | |
2226 | printk("unkknown found_type %d\n", found_type); | |
2227 | WARN_ON(1); | |
2228 | } | |
2229 | not_found: | |
2230 | em->start = start; | |
d1310b2e | 2231 | em->len = len; |
a52d9a80 | 2232 | not_found_em: |
5f39d397 | 2233 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2234 | insert: |
2235 | btrfs_release_path(root, path); | |
d1310b2e CM |
2236 | if (em->start > start || extent_map_end(em) <= start) { |
2237 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2238 | err = -EIO; |
2239 | goto out; | |
2240 | } | |
d1310b2e CM |
2241 | |
2242 | err = 0; | |
2243 | spin_lock(&em_tree->lock); | |
a52d9a80 CM |
2244 | ret = add_extent_mapping(em_tree, em); |
2245 | if (ret == -EEXIST) { | |
2246 | free_extent_map(em); | |
d1310b2e CM |
2247 | em = lookup_extent_mapping(em_tree, start, len); |
2248 | if (!em) { | |
a52d9a80 | 2249 | err = -EIO; |
d1310b2e | 2250 | printk("failing to insert %Lu %Lu\n", start, len); |
a52d9a80 | 2251 | } |
a52d9a80 | 2252 | } |
d1310b2e | 2253 | spin_unlock(&em_tree->lock); |
a52d9a80 CM |
2254 | out: |
2255 | btrfs_free_path(path); | |
2256 | if (trans) { | |
2257 | ret = btrfs_end_transaction(trans, root); | |
2258 | if (!err) | |
2259 | err = ret; | |
2260 | } | |
2261 | mutex_unlock(&root->fs_info->fs_mutex); | |
2262 | if (err) { | |
2263 | free_extent_map(em); | |
2264 | WARN_ON(1); | |
2265 | return ERR_PTR(err); | |
2266 | } | |
2267 | return em; | |
2268 | } | |
2269 | ||
16432985 CM |
2270 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
2271 | struct buffer_head *bh_result, int create) | |
2272 | { | |
2273 | struct extent_map *em; | |
2274 | u64 start = (u64)iblock << inode->i_blkbits; | |
2275 | struct btrfs_multi_bio *multi = NULL; | |
2276 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2277 | u64 len; | |
2278 | u64 logical; | |
2279 | u64 map_length; | |
2280 | int ret = 0; | |
2281 | ||
2282 | em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0); | |
2283 | ||
2284 | if (!em || IS_ERR(em)) | |
2285 | goto out; | |
2286 | ||
2287 | if (em->start > start || em->start + em->len <= start) | |
2288 | goto out; | |
2289 | ||
2290 | if (em->block_start == EXTENT_MAP_INLINE) { | |
2291 | ret = -EINVAL; | |
2292 | goto out; | |
2293 | } | |
2294 | ||
2295 | if (em->block_start == EXTENT_MAP_HOLE || | |
2296 | em->block_start == EXTENT_MAP_DELALLOC) { | |
2297 | goto out; | |
2298 | } | |
2299 | ||
2300 | len = em->start + em->len - start; | |
2301 | len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size))); | |
2302 | ||
2303 | logical = start - em->start; | |
2304 | logical = em->block_start + logical; | |
2305 | ||
2306 | map_length = len; | |
2307 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
2308 | logical, &map_length, &multi, 0); | |
2309 | BUG_ON(ret); | |
2310 | bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits; | |
2311 | bh_result->b_size = min(map_length, len); | |
2312 | bh_result->b_bdev = multi->stripes[0].dev->bdev; | |
2313 | set_buffer_mapped(bh_result); | |
2314 | kfree(multi); | |
2315 | out: | |
2316 | free_extent_map(em); | |
2317 | return ret; | |
2318 | } | |
2319 | ||
2320 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, | |
2321 | const struct iovec *iov, loff_t offset, | |
2322 | unsigned long nr_segs) | |
2323 | { | |
2324 | struct file *file = iocb->ki_filp; | |
2325 | struct inode *inode = file->f_mapping->host; | |
2326 | ||
2327 | if (rw == WRITE) | |
2328 | return -EINVAL; | |
2329 | ||
2330 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
2331 | offset, nr_segs, btrfs_get_block, NULL); | |
2332 | } | |
2333 | ||
d396c6f5 | 2334 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2335 | { |
d396c6f5 | 2336 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2337 | } |
2338 | ||
a52d9a80 | 2339 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2340 | { |
d1310b2e CM |
2341 | struct extent_io_tree *tree; |
2342 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2343 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2344 | } |
1832a6d5 | 2345 | |
a52d9a80 | 2346 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2347 | { |
d1310b2e | 2348 | struct extent_io_tree *tree; |
b888db2b CM |
2349 | |
2350 | ||
2351 | if (current->flags & PF_MEMALLOC) { | |
2352 | redirty_page_for_writepage(wbc, page); | |
2353 | unlock_page(page); | |
2354 | return 0; | |
2355 | } | |
d1310b2e | 2356 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2357 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2358 | } |
2359 | ||
b293f02e CM |
2360 | static int btrfs_writepages(struct address_space *mapping, |
2361 | struct writeback_control *wbc) | |
2362 | { | |
d1310b2e CM |
2363 | struct extent_io_tree *tree; |
2364 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2365 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2366 | } | |
2367 | ||
3ab2fb5a CM |
2368 | static int |
2369 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2370 | struct list_head *pages, unsigned nr_pages) | |
2371 | { | |
d1310b2e CM |
2372 | struct extent_io_tree *tree; |
2373 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2374 | return extent_readpages(tree, mapping, pages, nr_pages, |
2375 | btrfs_get_extent); | |
2376 | } | |
2377 | ||
70dec807 | 2378 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2379 | { |
d1310b2e CM |
2380 | struct extent_io_tree *tree; |
2381 | struct extent_map_tree *map; | |
a52d9a80 | 2382 | int ret; |
8c2383c3 | 2383 | |
d1310b2e CM |
2384 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2385 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2386 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
2387 | if (ret == 1) { |
2388 | ClearPagePrivate(page); | |
2389 | set_page_private(page, 0); | |
2390 | page_cache_release(page); | |
39279cc3 | 2391 | } |
a52d9a80 | 2392 | return ret; |
39279cc3 CM |
2393 | } |
2394 | ||
a52d9a80 | 2395 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2396 | { |
d1310b2e | 2397 | struct extent_io_tree *tree; |
39279cc3 | 2398 | |
d1310b2e | 2399 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 CM |
2400 | extent_invalidatepage(tree, page, offset); |
2401 | btrfs_releasepage(page, GFP_NOFS); | |
39279cc3 CM |
2402 | } |
2403 | ||
9ebefb18 CM |
2404 | /* |
2405 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2406 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2407 | * be careful to check for EOF conditions here. We set the page up correctly | |
2408 | * for a written page which means we get ENOSPC checking when writing into | |
2409 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2410 | * support these features. | |
2411 | * | |
2412 | * We are not allowed to take the i_mutex here so we have to play games to | |
2413 | * protect against truncate races as the page could now be beyond EOF. Because | |
2414 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2415 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2416 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2417 | * unlock the page. | |
2418 | */ | |
2419 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2420 | { | |
6da6abae | 2421 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2422 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2423 | unsigned long end; |
2424 | loff_t size; | |
1832a6d5 | 2425 | int ret; |
a52d9a80 | 2426 | u64 page_start; |
9ebefb18 | 2427 | |
1832a6d5 CM |
2428 | mutex_lock(&root->fs_info->fs_mutex); |
2429 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2430 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2431 | if (ret) |
2432 | goto out; | |
2433 | ||
2434 | ret = -EINVAL; | |
2435 | ||
9ebefb18 CM |
2436 | lock_page(page); |
2437 | wait_on_page_writeback(page); | |
9ebefb18 | 2438 | size = i_size_read(inode); |
35ebb934 | 2439 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2440 | |
9ebefb18 | 2441 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2442 | (page_start > size)) { |
9ebefb18 CM |
2443 | /* page got truncated out from underneath us */ |
2444 | goto out_unlock; | |
2445 | } | |
2446 | ||
2447 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2448 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2449 | end = size & ~PAGE_CACHE_MASK; |
2450 | else | |
2451 | end = PAGE_CACHE_SIZE; | |
2452 | ||
b888db2b | 2453 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2454 | |
2455 | out_unlock: | |
2456 | unlock_page(page); | |
1832a6d5 | 2457 | out: |
9ebefb18 CM |
2458 | return ret; |
2459 | } | |
2460 | ||
39279cc3 CM |
2461 | static void btrfs_truncate(struct inode *inode) |
2462 | { | |
2463 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2464 | int ret; | |
2465 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2466 | unsigned long nr; |
39279cc3 CM |
2467 | |
2468 | if (!S_ISREG(inode->i_mode)) | |
2469 | return; | |
2470 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2471 | return; | |
2472 | ||
2473 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2474 | ||
2475 | mutex_lock(&root->fs_info->fs_mutex); | |
2476 | trans = btrfs_start_transaction(root, 1); | |
2477 | btrfs_set_trans_block_group(trans, inode); | |
2478 | ||
2479 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
85e21bac CM |
2480 | ret = btrfs_truncate_in_trans(trans, root, inode, |
2481 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 2482 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2483 | nr = trans->blocks_used; |
5f39d397 | 2484 | |
39279cc3 CM |
2485 | ret = btrfs_end_transaction(trans, root); |
2486 | BUG_ON(ret); | |
2487 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2488 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2489 | btrfs_throttle(root); |
39279cc3 CM |
2490 | } |
2491 | ||
4313b399 CM |
2492 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2493 | int namelen) | |
39279cc3 CM |
2494 | { |
2495 | struct btrfs_trans_handle *trans; | |
2496 | struct btrfs_key key; | |
2497 | struct btrfs_root_item root_item; | |
2498 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2499 | struct extent_buffer *leaf; |
dc17ff8f | 2500 | struct btrfs_root *new_root = root; |
39279cc3 CM |
2501 | struct inode *inode; |
2502 | struct inode *dir; | |
2503 | int ret; | |
54aa1f4d | 2504 | int err; |
39279cc3 CM |
2505 | u64 objectid; |
2506 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2507 | unsigned long nr = 1; |
39279cc3 CM |
2508 | |
2509 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2510 | ret = btrfs_check_free_space(root, 1, 0); |
2511 | if (ret) | |
2512 | goto fail_commit; | |
2513 | ||
39279cc3 CM |
2514 | trans = btrfs_start_transaction(root, 1); |
2515 | BUG_ON(!trans); | |
2516 | ||
7bb86316 CM |
2517 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2518 | 0, &objectid); | |
2519 | if (ret) | |
2520 | goto fail; | |
2521 | ||
2522 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2523 | objectid, trans->transid, 0, 0, | |
2524 | 0, 0); | |
5f39d397 CM |
2525 | if (IS_ERR(leaf)) |
2526 | return PTR_ERR(leaf); | |
2527 | ||
2528 | btrfs_set_header_nritems(leaf, 0); | |
2529 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2530 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2531 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2532 | btrfs_set_header_owner(leaf, objectid); |
2533 | ||
5f39d397 CM |
2534 | write_extent_buffer(leaf, root->fs_info->fsid, |
2535 | (unsigned long)btrfs_header_fsid(leaf), | |
2536 | BTRFS_FSID_SIZE); | |
2537 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2538 | |
2539 | inode_item = &root_item.inode; | |
2540 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2541 | inode_item->generation = cpu_to_le64(1); |
2542 | inode_item->size = cpu_to_le64(3); | |
2543 | inode_item->nlink = cpu_to_le32(1); | |
2544 | inode_item->nblocks = cpu_to_le64(1); | |
2545 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2546 | |
db94535d CM |
2547 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2548 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2549 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2550 | btrfs_set_root_used(&root_item, 0); |
2551 | ||
5eda7b5e CM |
2552 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2553 | root_item.drop_level = 0; | |
5f39d397 CM |
2554 | |
2555 | free_extent_buffer(leaf); | |
2556 | leaf = NULL; | |
39279cc3 | 2557 | |
39279cc3 CM |
2558 | btrfs_set_root_dirid(&root_item, new_dirid); |
2559 | ||
2560 | key.objectid = objectid; | |
2561 | key.offset = 1; | |
39279cc3 CM |
2562 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2563 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2564 | &root_item); | |
54aa1f4d CM |
2565 | if (ret) |
2566 | goto fail; | |
39279cc3 CM |
2567 | |
2568 | /* | |
2569 | * insert the directory item | |
2570 | */ | |
2571 | key.offset = (u64)-1; | |
2572 | dir = root->fs_info->sb->s_root->d_inode; | |
2573 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2574 | name, namelen, dir->i_ino, &key, | |
2575 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2576 | if (ret) |
2577 | goto fail; | |
39279cc3 | 2578 | |
3954401f CM |
2579 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2580 | name, namelen, objectid, | |
2581 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2582 | if (ret) | |
2583 | goto fail; | |
2584 | ||
39279cc3 | 2585 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2586 | if (ret) |
2587 | goto fail_commit; | |
39279cc3 | 2588 | |
58176a96 | 2589 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2590 | BUG_ON(!new_root); |
2591 | ||
2592 | trans = btrfs_start_transaction(new_root, 1); | |
2593 | BUG_ON(!trans); | |
2594 | ||
9c58309d CM |
2595 | inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid, |
2596 | new_dirid, | |
39279cc3 | 2597 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); |
54aa1f4d CM |
2598 | if (IS_ERR(inode)) |
2599 | goto fail; | |
39279cc3 CM |
2600 | inode->i_op = &btrfs_dir_inode_operations; |
2601 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2602 | new_root->inode = inode; |
39279cc3 | 2603 | |
3954401f CM |
2604 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2605 | new_dirid); | |
39279cc3 | 2606 | inode->i_nlink = 1; |
3954401f | 2607 | inode->i_size = 0; |
39279cc3 | 2608 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2609 | if (ret) |
2610 | goto fail; | |
2611 | fail: | |
d3c2fdcf | 2612 | nr = trans->blocks_used; |
dc17ff8f | 2613 | err = btrfs_commit_transaction(trans, new_root); |
54aa1f4d CM |
2614 | if (err && !ret) |
2615 | ret = err; | |
2616 | fail_commit: | |
39279cc3 | 2617 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2618 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2619 | btrfs_throttle(root); |
54aa1f4d | 2620 | return ret; |
39279cc3 CM |
2621 | } |
2622 | ||
2623 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2624 | { | |
3063d29f | 2625 | struct btrfs_pending_snapshot *pending_snapshot; |
39279cc3 | 2626 | struct btrfs_trans_handle *trans; |
39279cc3 | 2627 | int ret; |
54aa1f4d | 2628 | int err; |
1832a6d5 | 2629 | unsigned long nr = 0; |
39279cc3 CM |
2630 | |
2631 | if (!root->ref_cows) | |
2632 | return -EINVAL; | |
2633 | ||
2634 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2635 | ret = btrfs_check_free_space(root, 1, 0); |
2636 | if (ret) | |
2637 | goto fail_unlock; | |
2638 | ||
3063d29f CM |
2639 | pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); |
2640 | if (!pending_snapshot) { | |
2641 | ret = -ENOMEM; | |
2642 | goto fail_unlock; | |
2643 | } | |
fb4bc1e0 | 2644 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); |
3063d29f CM |
2645 | if (!pending_snapshot->name) { |
2646 | ret = -ENOMEM; | |
2647 | kfree(pending_snapshot); | |
2648 | goto fail_unlock; | |
2649 | } | |
fb4bc1e0 Y |
2650 | memcpy(pending_snapshot->name, name, namelen); |
2651 | pending_snapshot->name[namelen] = '\0'; | |
39279cc3 CM |
2652 | trans = btrfs_start_transaction(root, 1); |
2653 | BUG_ON(!trans); | |
3063d29f CM |
2654 | pending_snapshot->root = root; |
2655 | list_add(&pending_snapshot->list, | |
2656 | &trans->transaction->pending_snapshots); | |
39279cc3 | 2657 | ret = btrfs_update_inode(trans, root, root->inode); |
54aa1f4d | 2658 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2659 | |
1832a6d5 | 2660 | fail_unlock: |
39279cc3 | 2661 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2662 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2663 | btrfs_throttle(root); |
54aa1f4d | 2664 | return ret; |
39279cc3 CM |
2665 | } |
2666 | ||
edbd8d4e | 2667 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2668 | struct file_ra_state *ra, struct file *file, |
2669 | pgoff_t offset, pgoff_t last_index) | |
2670 | { | |
2671 | pgoff_t req_size; | |
2672 | ||
2673 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2674 | req_size = last_index - offset + 1; | |
2675 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); | |
2676 | return offset; | |
2677 | #else | |
2678 | req_size = min(last_index - offset + 1, (pgoff_t)128); | |
2679 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); | |
2680 | return offset + req_size; | |
2681 | #endif | |
2682 | } | |
2683 | ||
2684 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2685 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2686 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 2687 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
86479a04 CM |
2688 | struct page *page; |
2689 | unsigned long last_index; | |
2690 | unsigned long ra_index = 0; | |
2691 | u64 page_start; | |
2692 | u64 page_end; | |
2693 | unsigned long i; | |
1832a6d5 CM |
2694 | int ret; |
2695 | ||
2696 | mutex_lock(&root->fs_info->fs_mutex); | |
2697 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2698 | mutex_unlock(&root->fs_info->fs_mutex); | |
2699 | if (ret) | |
2700 | return -ENOSPC; | |
86479a04 CM |
2701 | |
2702 | mutex_lock(&inode->i_mutex); | |
2703 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2704 | for (i = 0; i <= last_index; i++) { | |
2705 | if (i == ra_index) { | |
edbd8d4e CM |
2706 | ra_index = btrfs_force_ra(inode->i_mapping, |
2707 | &file->f_ra, | |
2708 | file, ra_index, last_index); | |
86479a04 CM |
2709 | } |
2710 | page = grab_cache_page(inode->i_mapping, i); | |
2711 | if (!page) | |
2712 | goto out_unlock; | |
2713 | if (!PageUptodate(page)) { | |
2714 | btrfs_readpage(NULL, page); | |
2715 | lock_page(page); | |
2716 | if (!PageUptodate(page)) { | |
2717 | unlock_page(page); | |
2718 | page_cache_release(page); | |
2719 | goto out_unlock; | |
2720 | } | |
2721 | } | |
35ebb934 | 2722 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2723 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2724 | ||
d1310b2e | 2725 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 2726 | set_extent_delalloc(io_tree, page_start, |
86479a04 | 2727 | page_end, GFP_NOFS); |
edbd8d4e | 2728 | |
d1310b2e | 2729 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
86479a04 CM |
2730 | set_page_dirty(page); |
2731 | unlock_page(page); | |
2732 | page_cache_release(page); | |
2733 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2734 | } | |
2735 | ||
2736 | out_unlock: | |
2737 | mutex_unlock(&inode->i_mutex); | |
2738 | return 0; | |
2739 | } | |
2740 | ||
edbd8d4e CM |
2741 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2742 | { | |
2743 | u64 new_size; | |
2744 | u64 old_size; | |
2745 | struct btrfs_ioctl_vol_args *vol_args; | |
2746 | struct btrfs_trans_handle *trans; | |
2747 | char *sizestr; | |
2748 | int ret = 0; | |
2749 | int namelen; | |
2750 | int mod = 0; | |
2751 | ||
2752 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2753 | ||
2754 | if (!vol_args) | |
2755 | return -ENOMEM; | |
2756 | ||
2757 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2758 | ret = -EFAULT; | |
2759 | goto out; | |
2760 | } | |
2761 | namelen = strlen(vol_args->name); | |
2762 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2763 | ret = -EINVAL; | |
2764 | goto out; | |
2765 | } | |
2766 | ||
2767 | sizestr = vol_args->name; | |
2768 | if (!strcmp(sizestr, "max")) | |
2769 | new_size = root->fs_info->sb->s_bdev->bd_inode->i_size; | |
2770 | else { | |
2771 | if (sizestr[0] == '-') { | |
2772 | mod = -1; | |
2773 | sizestr++; | |
2774 | } else if (sizestr[0] == '+') { | |
2775 | mod = 1; | |
2776 | sizestr++; | |
2777 | } | |
2778 | new_size = btrfs_parse_size(sizestr); | |
2779 | if (new_size == 0) { | |
2780 | ret = -EINVAL; | |
2781 | goto out; | |
2782 | } | |
2783 | } | |
2784 | ||
2785 | mutex_lock(&root->fs_info->fs_mutex); | |
2786 | old_size = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
2787 | ||
2788 | if (mod < 0) { | |
2789 | if (new_size > old_size) { | |
2790 | ret = -EINVAL; | |
2791 | goto out_unlock; | |
2792 | } | |
2793 | new_size = old_size - new_size; | |
2794 | } else if (mod > 0) { | |
2795 | new_size = old_size + new_size; | |
2796 | } | |
2797 | ||
2798 | if (new_size < 256 * 1024 * 1024) { | |
2799 | ret = -EINVAL; | |
2800 | goto out_unlock; | |
2801 | } | |
2802 | if (new_size > root->fs_info->sb->s_bdev->bd_inode->i_size) { | |
2803 | ret = -EFBIG; | |
2804 | goto out_unlock; | |
2805 | } | |
f9ef6604 CM |
2806 | |
2807 | do_div(new_size, root->sectorsize); | |
2808 | new_size *= root->sectorsize; | |
edbd8d4e CM |
2809 | |
2810 | printk("new size is %Lu\n", new_size); | |
2811 | if (new_size > old_size) { | |
2812 | trans = btrfs_start_transaction(root, 1); | |
2813 | ret = btrfs_grow_extent_tree(trans, root, new_size); | |
2814 | btrfs_commit_transaction(trans, root); | |
2815 | } else { | |
2816 | ret = btrfs_shrink_extent_tree(root, new_size); | |
2817 | } | |
2818 | ||
2819 | out_unlock: | |
2820 | mutex_unlock(&root->fs_info->fs_mutex); | |
2821 | out: | |
2822 | kfree(vol_args); | |
2823 | return ret; | |
2824 | } | |
2825 | ||
4313b399 CM |
2826 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
2827 | void __user *arg) | |
39279cc3 | 2828 | { |
4aec2b52 | 2829 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 2830 | struct btrfs_dir_item *di; |
39279cc3 CM |
2831 | struct btrfs_path *path; |
2832 | u64 root_dirid; | |
4aec2b52 CM |
2833 | int namelen; |
2834 | int ret; | |
39279cc3 | 2835 | |
4aec2b52 | 2836 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 2837 | |
4aec2b52 CM |
2838 | if (!vol_args) |
2839 | return -ENOMEM; | |
2840 | ||
2841 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2842 | ret = -EFAULT; | |
2843 | goto out; | |
2844 | } | |
2845 | ||
2846 | namelen = strlen(vol_args->name); | |
2847 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2848 | ret = -EINVAL; | |
2849 | goto out; | |
2850 | } | |
2851 | if (strchr(vol_args->name, '/')) { | |
2852 | ret = -EINVAL; | |
2853 | goto out; | |
2854 | } | |
d03581f4 CH |
2855 | |
2856 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
2857 | if (!path) { |
2858 | ret = -ENOMEM; | |
2859 | goto out; | |
2860 | } | |
d03581f4 CH |
2861 | |
2862 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
2863 | mutex_lock(&root->fs_info->fs_mutex); | |
2864 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
2865 | path, root_dirid, | |
4aec2b52 | 2866 | vol_args->name, namelen, 0); |
d03581f4 CH |
2867 | mutex_unlock(&root->fs_info->fs_mutex); |
2868 | btrfs_free_path(path); | |
4aec2b52 CM |
2869 | |
2870 | if (di && !IS_ERR(di)) { | |
2871 | ret = -EEXIST; | |
2872 | goto out; | |
2873 | } | |
2874 | ||
2875 | if (IS_ERR(di)) { | |
2876 | ret = PTR_ERR(di); | |
2877 | goto out; | |
2878 | } | |
d03581f4 CH |
2879 | |
2880 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
2881 | ret = create_subvol(root, vol_args->name, namelen); |
2882 | else | |
2883 | ret = create_snapshot(root, vol_args->name, namelen); | |
2884 | out: | |
2885 | kfree(vol_args); | |
2886 | return ret; | |
d03581f4 CH |
2887 | } |
2888 | ||
2889 | static int btrfs_ioctl_defrag(struct file *file) | |
2890 | { | |
6da6abae | 2891 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
2892 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2893 | ||
2894 | switch (inode->i_mode & S_IFMT) { | |
2895 | case S_IFDIR: | |
39279cc3 | 2896 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
2897 | btrfs_defrag_root(root, 0); |
2898 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 2899 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 2900 | break; |
d03581f4 CH |
2901 | case S_IFREG: |
2902 | btrfs_defrag_file(file); | |
2903 | break; | |
2904 | } | |
2905 | ||
2906 | return 0; | |
2907 | } | |
6702ed49 | 2908 | |
d03581f4 CH |
2909 | long btrfs_ioctl(struct file *file, unsigned int |
2910 | cmd, unsigned long arg) | |
2911 | { | |
6da6abae | 2912 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
2913 | |
2914 | switch (cmd) { | |
2915 | case BTRFS_IOC_SNAP_CREATE: | |
2916 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 2917 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 2918 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
2919 | case BTRFS_IOC_RESIZE: |
2920 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
39279cc3 | 2921 | } |
d03581f4 CH |
2922 | |
2923 | return -ENOTTY; | |
39279cc3 CM |
2924 | } |
2925 | ||
39279cc3 CM |
2926 | /* |
2927 | * Called inside transaction, so use GFP_NOFS | |
2928 | */ | |
2929 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
2930 | { | |
2931 | struct btrfs_inode *ei; | |
2932 | ||
2933 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
2934 | if (!ei) | |
2935 | return NULL; | |
15ee9bc7 | 2936 | ei->last_trans = 0; |
dc17ff8f | 2937 | ei->ordered_trans = 0; |
39279cc3 CM |
2938 | return &ei->vfs_inode; |
2939 | } | |
2940 | ||
2941 | void btrfs_destroy_inode(struct inode *inode) | |
2942 | { | |
2943 | WARN_ON(!list_empty(&inode->i_dentry)); | |
2944 | WARN_ON(inode->i_data.nrpages); | |
2945 | ||
8c416c9e | 2946 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
2947 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
2948 | } | |
2949 | ||
44ec0b71 CM |
2950 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2951 | static void init_once(struct kmem_cache * cachep, void *foo) | |
2952 | #else | |
39279cc3 CM |
2953 | static void init_once(void * foo, struct kmem_cache * cachep, |
2954 | unsigned long flags) | |
44ec0b71 | 2955 | #endif |
39279cc3 CM |
2956 | { |
2957 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
2958 | ||
2959 | inode_init_once(&ei->vfs_inode); | |
2960 | } | |
2961 | ||
2962 | void btrfs_destroy_cachep(void) | |
2963 | { | |
2964 | if (btrfs_inode_cachep) | |
2965 | kmem_cache_destroy(btrfs_inode_cachep); | |
2966 | if (btrfs_trans_handle_cachep) | |
2967 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
2968 | if (btrfs_transaction_cachep) | |
2969 | kmem_cache_destroy(btrfs_transaction_cachep); | |
2970 | if (btrfs_bit_radix_cachep) | |
2971 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
2972 | if (btrfs_path_cachep) | |
2973 | kmem_cache_destroy(btrfs_path_cachep); | |
2974 | } | |
2975 | ||
86479a04 | 2976 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 2977 | unsigned long extra_flags, |
44ec0b71 CM |
2978 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
2979 | void (*ctor)(struct kmem_cache *, void *) | |
2980 | #else | |
92fee66d | 2981 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
2982 | unsigned long) |
2983 | #endif | |
2984 | ) | |
92fee66d CM |
2985 | { |
2986 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2987 | SLAB_MEM_SPREAD | extra_flags), ctor | |
2988 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
2989 | ,NULL | |
2990 | #endif | |
2991 | ); | |
2992 | } | |
2993 | ||
39279cc3 CM |
2994 | int btrfs_init_cachep(void) |
2995 | { | |
86479a04 | 2996 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
2997 | sizeof(struct btrfs_inode), |
2998 | 0, init_once); | |
39279cc3 CM |
2999 | if (!btrfs_inode_cachep) |
3000 | goto fail; | |
86479a04 CM |
3001 | btrfs_trans_handle_cachep = |
3002 | btrfs_cache_create("btrfs_trans_handle_cache", | |
3003 | sizeof(struct btrfs_trans_handle), | |
3004 | 0, NULL); | |
39279cc3 CM |
3005 | if (!btrfs_trans_handle_cachep) |
3006 | goto fail; | |
86479a04 | 3007 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 3008 | sizeof(struct btrfs_transaction), |
92fee66d | 3009 | 0, NULL); |
39279cc3 CM |
3010 | if (!btrfs_transaction_cachep) |
3011 | goto fail; | |
86479a04 | 3012 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 3013 | sizeof(struct btrfs_path), |
92fee66d | 3014 | 0, NULL); |
39279cc3 CM |
3015 | if (!btrfs_path_cachep) |
3016 | goto fail; | |
86479a04 | 3017 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 3018 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
3019 | if (!btrfs_bit_radix_cachep) |
3020 | goto fail; | |
3021 | return 0; | |
3022 | fail: | |
3023 | btrfs_destroy_cachep(); | |
3024 | return -ENOMEM; | |
3025 | } | |
3026 | ||
3027 | static int btrfs_getattr(struct vfsmount *mnt, | |
3028 | struct dentry *dentry, struct kstat *stat) | |
3029 | { | |
3030 | struct inode *inode = dentry->d_inode; | |
3031 | generic_fillattr(inode, stat); | |
d6667462 | 3032 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 3033 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
3034 | return 0; |
3035 | } | |
3036 | ||
3037 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
3038 | struct inode * new_dir,struct dentry *new_dentry) | |
3039 | { | |
3040 | struct btrfs_trans_handle *trans; | |
3041 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
3042 | struct inode *new_inode = new_dentry->d_inode; | |
3043 | struct inode *old_inode = old_dentry->d_inode; | |
3044 | struct timespec ctime = CURRENT_TIME; | |
3045 | struct btrfs_path *path; | |
39279cc3 CM |
3046 | int ret; |
3047 | ||
3048 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
3049 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
3050 | return -ENOTEMPTY; | |
3051 | } | |
5f39d397 | 3052 | |
39279cc3 | 3053 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
3054 | ret = btrfs_check_free_space(root, 1, 0); |
3055 | if (ret) | |
3056 | goto out_unlock; | |
3057 | ||
39279cc3 | 3058 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 3059 | |
39279cc3 CM |
3060 | btrfs_set_trans_block_group(trans, new_dir); |
3061 | path = btrfs_alloc_path(); | |
3062 | if (!path) { | |
3063 | ret = -ENOMEM; | |
3064 | goto out_fail; | |
3065 | } | |
3066 | ||
3067 | old_dentry->d_inode->i_nlink++; | |
3068 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
3069 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
3070 | old_inode->i_ctime = ctime; | |
5f39d397 | 3071 | |
39279cc3 CM |
3072 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
3073 | if (ret) | |
3074 | goto out_fail; | |
3075 | ||
3076 | if (new_inode) { | |
3077 | new_inode->i_ctime = CURRENT_TIME; | |
3078 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
3079 | if (ret) | |
3080 | goto out_fail; | |
39279cc3 | 3081 | } |
9c58309d | 3082 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1); |
39279cc3 CM |
3083 | if (ret) |
3084 | goto out_fail; | |
3085 | ||
3086 | out_fail: | |
3087 | btrfs_free_path(path); | |
3088 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 3089 | out_unlock: |
39279cc3 CM |
3090 | mutex_unlock(&root->fs_info->fs_mutex); |
3091 | return ret; | |
3092 | } | |
3093 | ||
3094 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
3095 | const char *symname) | |
3096 | { | |
3097 | struct btrfs_trans_handle *trans; | |
3098 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
3099 | struct btrfs_path *path; | |
3100 | struct btrfs_key key; | |
1832a6d5 | 3101 | struct inode *inode = NULL; |
39279cc3 CM |
3102 | int err; |
3103 | int drop_inode = 0; | |
3104 | u64 objectid; | |
3105 | int name_len; | |
3106 | int datasize; | |
5f39d397 | 3107 | unsigned long ptr; |
39279cc3 | 3108 | struct btrfs_file_extent_item *ei; |
5f39d397 | 3109 | struct extent_buffer *leaf; |
1832a6d5 | 3110 | unsigned long nr = 0; |
39279cc3 CM |
3111 | |
3112 | name_len = strlen(symname) + 1; | |
3113 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
3114 | return -ENAMETOOLONG; | |
1832a6d5 | 3115 | |
39279cc3 | 3116 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
3117 | err = btrfs_check_free_space(root, 1, 0); |
3118 | if (err) | |
3119 | goto out_fail; | |
3120 | ||
39279cc3 CM |
3121 | trans = btrfs_start_transaction(root, 1); |
3122 | btrfs_set_trans_block_group(trans, dir); | |
3123 | ||
3124 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
3125 | if (err) { | |
3126 | err = -ENOSPC; | |
3127 | goto out_unlock; | |
3128 | } | |
3129 | ||
9c58309d CM |
3130 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
3131 | dentry->d_name.len, | |
3132 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
3133 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); |
3134 | err = PTR_ERR(inode); | |
3135 | if (IS_ERR(inode)) | |
3136 | goto out_unlock; | |
3137 | ||
3138 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 3139 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
3140 | if (err) |
3141 | drop_inode = 1; | |
3142 | else { | |
3143 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 3144 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
3145 | inode->i_fop = &btrfs_file_operations; |
3146 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
3147 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
3148 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 3149 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
3150 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
3151 | inode->i_mapping, GFP_NOFS); | |
9069218d | 3152 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e | 3153 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
3154 | } |
3155 | dir->i_sb->s_dirt = 1; | |
3156 | btrfs_update_inode_block_group(trans, inode); | |
3157 | btrfs_update_inode_block_group(trans, dir); | |
3158 | if (drop_inode) | |
3159 | goto out_unlock; | |
3160 | ||
3161 | path = btrfs_alloc_path(); | |
3162 | BUG_ON(!path); | |
3163 | key.objectid = inode->i_ino; | |
3164 | key.offset = 0; | |
39279cc3 CM |
3165 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
3166 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
3167 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
3168 | datasize); | |
54aa1f4d CM |
3169 | if (err) { |
3170 | drop_inode = 1; | |
3171 | goto out_unlock; | |
3172 | } | |
5f39d397 CM |
3173 | leaf = path->nodes[0]; |
3174 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
3175 | struct btrfs_file_extent_item); | |
3176 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
3177 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
3178 | BTRFS_FILE_EXTENT_INLINE); |
3179 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
3180 | write_extent_buffer(leaf, symname, ptr, name_len); |
3181 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 3182 | btrfs_free_path(path); |
5f39d397 | 3183 | |
39279cc3 CM |
3184 | inode->i_op = &btrfs_symlink_inode_operations; |
3185 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 3186 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 3187 | inode->i_size = name_len - 1; |
54aa1f4d CM |
3188 | err = btrfs_update_inode(trans, root, inode); |
3189 | if (err) | |
3190 | drop_inode = 1; | |
39279cc3 CM |
3191 | |
3192 | out_unlock: | |
d3c2fdcf | 3193 | nr = trans->blocks_used; |
39279cc3 | 3194 | btrfs_end_transaction(trans, root); |
1832a6d5 | 3195 | out_fail: |
39279cc3 | 3196 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
3197 | if (drop_inode) { |
3198 | inode_dec_link_count(inode); | |
3199 | iput(inode); | |
3200 | } | |
d3c2fdcf | 3201 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 3202 | btrfs_throttle(root); |
39279cc3 CM |
3203 | return err; |
3204 | } | |
16432985 | 3205 | |
fdebe2bd Y |
3206 | static int btrfs_permission(struct inode *inode, int mask, |
3207 | struct nameidata *nd) | |
3208 | { | |
3209 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
3210 | return -EACCES; | |
3211 | return generic_permission(inode, mask, NULL); | |
3212 | } | |
39279cc3 CM |
3213 | |
3214 | static struct inode_operations btrfs_dir_inode_operations = { | |
3215 | .lookup = btrfs_lookup, | |
3216 | .create = btrfs_create, | |
3217 | .unlink = btrfs_unlink, | |
3218 | .link = btrfs_link, | |
3219 | .mkdir = btrfs_mkdir, | |
3220 | .rmdir = btrfs_rmdir, | |
3221 | .rename = btrfs_rename, | |
3222 | .symlink = btrfs_symlink, | |
3223 | .setattr = btrfs_setattr, | |
618e21d5 | 3224 | .mknod = btrfs_mknod, |
5103e947 JB |
3225 | .setxattr = generic_setxattr, |
3226 | .getxattr = generic_getxattr, | |
3227 | .listxattr = btrfs_listxattr, | |
3228 | .removexattr = generic_removexattr, | |
fdebe2bd | 3229 | .permission = btrfs_permission, |
39279cc3 | 3230 | }; |
39279cc3 CM |
3231 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3232 | .lookup = btrfs_lookup, | |
fdebe2bd | 3233 | .permission = btrfs_permission, |
39279cc3 | 3234 | }; |
39279cc3 CM |
3235 | static struct file_operations btrfs_dir_file_operations = { |
3236 | .llseek = generic_file_llseek, | |
3237 | .read = generic_read_dir, | |
3238 | .readdir = btrfs_readdir, | |
34287aa3 | 3239 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 3240 | #ifdef CONFIG_COMPAT |
34287aa3 | 3241 | .compat_ioctl = btrfs_ioctl, |
39279cc3 CM |
3242 | #endif |
3243 | }; | |
3244 | ||
d1310b2e | 3245 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 3246 | .fill_delalloc = run_delalloc_range, |
065631f6 | 3247 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 3248 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac CM |
3249 | .readpage_io_hook = btrfs_readpage_io_hook, |
3250 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
7e38326f | 3251 | .readpage_io_failed_hook = btrfs_readpage_io_failed_hook, |
b0c68f8b CM |
3252 | .set_bit_hook = btrfs_set_bit_hook, |
3253 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
3254 | }; |
3255 | ||
39279cc3 CM |
3256 | static struct address_space_operations btrfs_aops = { |
3257 | .readpage = btrfs_readpage, | |
3258 | .writepage = btrfs_writepage, | |
b293f02e | 3259 | .writepages = btrfs_writepages, |
3ab2fb5a | 3260 | .readpages = btrfs_readpages, |
39279cc3 | 3261 | .sync_page = block_sync_page, |
39279cc3 | 3262 | .bmap = btrfs_bmap, |
16432985 | 3263 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
3264 | .invalidatepage = btrfs_invalidatepage, |
3265 | .releasepage = btrfs_releasepage, | |
3266 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
3267 | }; |
3268 | ||
3269 | static struct address_space_operations btrfs_symlink_aops = { | |
3270 | .readpage = btrfs_readpage, | |
3271 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3272 | .invalidatepage = btrfs_invalidatepage, |
3273 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3274 | }; |
3275 | ||
3276 | static struct inode_operations btrfs_file_inode_operations = { | |
3277 | .truncate = btrfs_truncate, | |
3278 | .getattr = btrfs_getattr, | |
3279 | .setattr = btrfs_setattr, | |
5103e947 JB |
3280 | .setxattr = generic_setxattr, |
3281 | .getxattr = generic_getxattr, | |
3282 | .listxattr = btrfs_listxattr, | |
3283 | .removexattr = generic_removexattr, | |
fdebe2bd | 3284 | .permission = btrfs_permission, |
39279cc3 | 3285 | }; |
618e21d5 JB |
3286 | static struct inode_operations btrfs_special_inode_operations = { |
3287 | .getattr = btrfs_getattr, | |
3288 | .setattr = btrfs_setattr, | |
fdebe2bd | 3289 | .permission = btrfs_permission, |
618e21d5 | 3290 | }; |
39279cc3 CM |
3291 | static struct inode_operations btrfs_symlink_inode_operations = { |
3292 | .readlink = generic_readlink, | |
3293 | .follow_link = page_follow_link_light, | |
3294 | .put_link = page_put_link, | |
fdebe2bd | 3295 | .permission = btrfs_permission, |
39279cc3 | 3296 | }; |