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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
8f18cf13 | 19 | #include <linux/kernel.h> |
065631f6 | 20 | #include <linux/bio.h> |
39279cc3 | 21 | #include <linux/buffer_head.h> |
f2eb0a24 | 22 | #include <linux/file.h> |
39279cc3 CM |
23 | #include <linux/fs.h> |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/smp_lock.h> | |
30 | #include <linux/backing-dev.h> | |
31 | #include <linux/mpage.h> | |
32 | #include <linux/swap.h> | |
33 | #include <linux/writeback.h> | |
34 | #include <linux/statfs.h> | |
35 | #include <linux/compat.h> | |
9ebefb18 | 36 | #include <linux/bit_spinlock.h> |
92fee66d | 37 | #include <linux/version.h> |
5103e947 | 38 | #include <linux/xattr.h> |
39279cc3 CM |
39 | #include "ctree.h" |
40 | #include "disk-io.h" | |
41 | #include "transaction.h" | |
42 | #include "btrfs_inode.h" | |
43 | #include "ioctl.h" | |
44 | #include "print-tree.h" | |
0b86a832 | 45 | #include "volumes.h" |
39279cc3 CM |
46 | |
47 | struct btrfs_iget_args { | |
48 | u64 ino; | |
49 | struct btrfs_root *root; | |
50 | }; | |
51 | ||
52 | static struct inode_operations btrfs_dir_inode_operations; | |
53 | static struct inode_operations btrfs_symlink_inode_operations; | |
54 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 55 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
56 | static struct inode_operations btrfs_file_inode_operations; |
57 | static struct address_space_operations btrfs_aops; | |
58 | static struct address_space_operations btrfs_symlink_aops; | |
59 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 60 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
61 | |
62 | static struct kmem_cache *btrfs_inode_cachep; | |
63 | struct kmem_cache *btrfs_trans_handle_cachep; | |
64 | struct kmem_cache *btrfs_transaction_cachep; | |
65 | struct kmem_cache *btrfs_bit_radix_cachep; | |
66 | struct kmem_cache *btrfs_path_cachep; | |
67 | ||
68 | #define S_SHIFT 12 | |
69 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
70 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
71 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
72 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
73 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
74 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
75 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
76 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
77 | }; | |
78 | ||
1832a6d5 CM |
79 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
80 | int for_del) | |
81 | { | |
82 | u64 total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
83 | u64 used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
84 | u64 thresh; | |
bcbfce8a | 85 | unsigned long flags; |
1832a6d5 CM |
86 | int ret = 0; |
87 | ||
88 | if (for_del) | |
f9ef6604 | 89 | thresh = total * 90; |
1832a6d5 | 90 | else |
f9ef6604 CM |
91 | thresh = total * 85; |
92 | ||
93 | do_div(thresh, 100); | |
1832a6d5 | 94 | |
bcbfce8a | 95 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
1832a6d5 CM |
96 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) |
97 | ret = -ENOSPC; | |
bcbfce8a | 98 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
1832a6d5 CM |
99 | return ret; |
100 | } | |
101 | ||
be20aa9d | 102 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
103 | { |
104 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
105 | struct btrfs_trans_handle *trans; | |
b888db2b | 106 | u64 alloc_hint = 0; |
db94535d | 107 | u64 num_bytes; |
c59f8951 | 108 | u64 cur_alloc_size; |
db94535d | 109 | u64 blocksize = root->sectorsize; |
d1310b2e CM |
110 | u64 orig_start = start; |
111 | u64 orig_num_bytes; | |
be20aa9d CM |
112 | struct btrfs_key ins; |
113 | int ret; | |
b888db2b | 114 | |
b888db2b | 115 | trans = btrfs_start_transaction(root, 1); |
b888db2b | 116 | BUG_ON(!trans); |
be20aa9d CM |
117 | btrfs_set_trans_block_group(trans, inode); |
118 | ||
db94535d | 119 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 120 | num_bytes = max(blocksize, num_bytes); |
b888db2b | 121 | ret = btrfs_drop_extents(trans, root, inode, |
3326d1b0 | 122 | start, start + num_bytes, start, &alloc_hint); |
d1310b2e | 123 | orig_num_bytes = num_bytes; |
db94535d | 124 | |
179e29e4 CM |
125 | if (alloc_hint == EXTENT_MAP_INLINE) |
126 | goto out; | |
127 | ||
3b951516 CM |
128 | BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy)); |
129 | ||
c59f8951 CM |
130 | while(num_bytes > 0) { |
131 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
132 | ret = btrfs_alloc_extent(trans, root, cur_alloc_size, | |
98d20f67 | 133 | root->sectorsize, |
c59f8951 CM |
134 | root->root_key.objectid, |
135 | trans->transid, | |
136 | inode->i_ino, start, 0, | |
137 | alloc_hint, (u64)-1, &ins, 1); | |
138 | if (ret) { | |
139 | WARN_ON(1); | |
140 | goto out; | |
141 | } | |
98d20f67 | 142 | cur_alloc_size = ins.offset; |
c59f8951 CM |
143 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, |
144 | start, ins.objectid, ins.offset, | |
f2eb0a24 | 145 | ins.offset, 0); |
9069218d | 146 | inode->i_blocks += ins.offset >> 9; |
5f56406a | 147 | btrfs_check_file(root, inode); |
3b951516 CM |
148 | if (num_bytes < cur_alloc_size) { |
149 | printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes, | |
150 | cur_alloc_size); | |
151 | break; | |
152 | } | |
c59f8951 CM |
153 | num_bytes -= cur_alloc_size; |
154 | alloc_hint = ins.objectid + ins.offset; | |
155 | start += cur_alloc_size; | |
b888db2b | 156 | } |
d1310b2e CM |
157 | btrfs_drop_extent_cache(inode, orig_start, |
158 | orig_start + orig_num_bytes - 1); | |
dc17ff8f | 159 | btrfs_add_ordered_inode(inode); |
9069218d | 160 | btrfs_update_inode(trans, root, inode); |
b888db2b CM |
161 | out: |
162 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
163 | return ret; |
164 | } | |
165 | ||
166 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
167 | { | |
168 | u64 extent_start; | |
169 | u64 extent_end; | |
170 | u64 bytenr; | |
171 | u64 cow_end; | |
1832a6d5 | 172 | u64 loops = 0; |
c31f8830 | 173 | u64 total_fs_bytes; |
be20aa9d | 174 | struct btrfs_root *root = BTRFS_I(inode)->root; |
a68d5933 | 175 | struct btrfs_block_group_cache *block_group; |
be20aa9d CM |
176 | struct extent_buffer *leaf; |
177 | int found_type; | |
178 | struct btrfs_path *path; | |
179 | struct btrfs_file_extent_item *item; | |
180 | int ret; | |
181 | int err; | |
182 | struct btrfs_key found_key; | |
183 | ||
c31f8830 | 184 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
185 | path = btrfs_alloc_path(); |
186 | BUG_ON(!path); | |
187 | again: | |
188 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
189 | inode->i_ino, start, 0); | |
190 | if (ret < 0) { | |
191 | btrfs_free_path(path); | |
192 | return ret; | |
193 | } | |
194 | ||
195 | cow_end = end; | |
196 | if (ret != 0) { | |
197 | if (path->slots[0] == 0) | |
198 | goto not_found; | |
199 | path->slots[0]--; | |
200 | } | |
201 | ||
202 | leaf = path->nodes[0]; | |
203 | item = btrfs_item_ptr(leaf, path->slots[0], | |
204 | struct btrfs_file_extent_item); | |
205 | ||
206 | /* are we inside the extent that was found? */ | |
207 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
208 | found_type = btrfs_key_type(&found_key); | |
209 | if (found_key.objectid != inode->i_ino || | |
bbaf549e | 210 | found_type != BTRFS_EXTENT_DATA_KEY) |
be20aa9d | 211 | goto not_found; |
be20aa9d CM |
212 | |
213 | found_type = btrfs_file_extent_type(leaf, item); | |
214 | extent_start = found_key.offset; | |
215 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
216 | u64 extent_num_bytes; |
217 | ||
218 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
219 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
220 | err = 0; |
221 | ||
1832a6d5 CM |
222 | if (loops && start != extent_start) |
223 | goto not_found; | |
224 | ||
be20aa9d CM |
225 | if (start < extent_start || start >= extent_end) |
226 | goto not_found; | |
227 | ||
228 | cow_end = min(end, extent_end - 1); | |
229 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
230 | if (bytenr == 0) | |
231 | goto not_found; | |
232 | ||
a68d5933 CM |
233 | if (btrfs_count_snapshots_in_path(root, path, inode->i_ino, |
234 | bytenr) != 1) { | |
235 | goto not_found; | |
236 | } | |
237 | ||
c31f8830 CM |
238 | /* |
239 | * we may be called by the resizer, make sure we're inside | |
240 | * the limits of the FS | |
241 | */ | |
a68d5933 CM |
242 | block_group = btrfs_lookup_block_group(root->fs_info, |
243 | bytenr); | |
244 | if (!block_group || block_group->ro) | |
c31f8830 CM |
245 | goto not_found; |
246 | ||
be20aa9d | 247 | start = extent_end; |
bd09835d | 248 | } else { |
be20aa9d CM |
249 | goto not_found; |
250 | } | |
251 | loop: | |
252 | if (start > end) { | |
253 | btrfs_free_path(path); | |
254 | return 0; | |
255 | } | |
256 | btrfs_release_path(root, path); | |
1832a6d5 | 257 | loops++; |
be20aa9d CM |
258 | goto again; |
259 | ||
260 | not_found: | |
bbaf549e CM |
261 | cow_file_range(inode, start, end); |
262 | start = end + 1; | |
be20aa9d CM |
263 | goto loop; |
264 | } | |
265 | ||
266 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
267 | { | |
268 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
269 | int ret; | |
be20aa9d | 270 | mutex_lock(&root->fs_info->fs_mutex); |
b98b6767 Y |
271 | if (btrfs_test_opt(root, NODATACOW) || |
272 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
273 | ret = run_delalloc_nocow(inode, start, end); |
274 | else | |
275 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 276 | |
b888db2b CM |
277 | mutex_unlock(&root->fs_info->fs_mutex); |
278 | return ret; | |
279 | } | |
280 | ||
291d673e | 281 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 282 | unsigned long old, unsigned long bits) |
291d673e | 283 | { |
bcbfce8a | 284 | unsigned long flags; |
b0c68f8b | 285 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 286 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a | 287 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
9069218d | 288 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e | 289 | root->fs_info->delalloc_bytes += end - start + 1; |
bcbfce8a | 290 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
291 | } |
292 | return 0; | |
293 | } | |
294 | ||
295 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 296 | unsigned long old, unsigned long bits) |
291d673e | 297 | { |
b0c68f8b | 298 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 299 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a CM |
300 | unsigned long flags; |
301 | ||
302 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
b0c68f8b CM |
303 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
304 | printk("warning: delalloc account %Lu %Lu\n", | |
305 | end - start + 1, root->fs_info->delalloc_bytes); | |
306 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 307 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
308 | } else { |
309 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 310 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 311 | } |
bcbfce8a | 312 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
313 | } |
314 | return 0; | |
315 | } | |
316 | ||
239b14b3 CM |
317 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
318 | size_t size, struct bio *bio) | |
319 | { | |
320 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
321 | struct btrfs_mapping_tree *map_tree; | |
239b14b3 | 322 | u64 logical = bio->bi_sector << 9; |
239b14b3 CM |
323 | u64 length = 0; |
324 | u64 map_length; | |
239b14b3 CM |
325 | int ret; |
326 | ||
f2d8d74d | 327 | length = bio->bi_size; |
239b14b3 CM |
328 | map_tree = &root->fs_info->mapping_tree; |
329 | map_length = length; | |
cea9e445 | 330 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 331 | &map_length, NULL, 0); |
cea9e445 | 332 | |
239b14b3 | 333 | if (map_length < length + size) { |
239b14b3 CM |
334 | return 1; |
335 | } | |
336 | return 0; | |
337 | } | |
338 | ||
44b8bd7e | 339 | int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
f188591e | 340 | int mirror_num) |
065631f6 | 341 | { |
065631f6 CM |
342 | struct btrfs_root *root = BTRFS_I(inode)->root; |
343 | struct btrfs_trans_handle *trans; | |
344 | int ret = 0; | |
e015640f CM |
345 | char *sums = NULL; |
346 | ||
347 | ret = btrfs_csum_one_bio(root, bio, &sums); | |
348 | BUG_ON(ret); | |
065631f6 | 349 | |
44b8bd7e CM |
350 | mutex_lock(&root->fs_info->fs_mutex); |
351 | trans = btrfs_start_transaction(root, 1); | |
e015640f | 352 | |
44b8bd7e | 353 | btrfs_set_trans_block_group(trans, inode); |
e015640f CM |
354 | btrfs_csum_file_blocks(trans, root, inode, bio, sums); |
355 | ||
44b8bd7e CM |
356 | ret = btrfs_end_transaction(trans, root); |
357 | BUG_ON(ret); | |
358 | mutex_unlock(&root->fs_info->fs_mutex); | |
e015640f CM |
359 | |
360 | kfree(sums); | |
361 | ||
44b8bd7e CM |
362 | return btrfs_map_bio(root, rw, bio, mirror_num); |
363 | } | |
364 | ||
365 | int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, | |
366 | int mirror_num) | |
367 | { | |
368 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
369 | int ret = 0; | |
370 | ||
22c59948 CM |
371 | if (!(rw & (1 << BIO_RW))) { |
372 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); | |
373 | BUG_ON(ret); | |
0b86a832 CM |
374 | goto mapit; |
375 | } | |
065631f6 CM |
376 | |
377 | if (btrfs_test_opt(root, NODATASUM) || | |
0b86a832 CM |
378 | btrfs_test_flag(inode, NODATASUM)) { |
379 | goto mapit; | |
380 | } | |
065631f6 | 381 | |
44b8bd7e CM |
382 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
383 | inode, rw, bio, mirror_num, | |
384 | __btrfs_submit_bio_hook); | |
0b86a832 | 385 | mapit: |
f188591e | 386 | return btrfs_map_bio(root, rw, bio, mirror_num); |
065631f6 | 387 | } |
6885f308 | 388 | |
07157aac CM |
389 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) |
390 | { | |
391 | int ret = 0; | |
392 | struct inode *inode = page->mapping->host; | |
393 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 394 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
395 | struct btrfs_csum_item *item; |
396 | struct btrfs_path *path = NULL; | |
ff79f819 | 397 | u32 csum; |
699122f5 | 398 | |
b98b6767 Y |
399 | if (btrfs_test_opt(root, NODATASUM) || |
400 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 401 | return 0; |
699122f5 | 402 | |
07157aac CM |
403 | mutex_lock(&root->fs_info->fs_mutex); |
404 | path = btrfs_alloc_path(); | |
405 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
406 | if (IS_ERR(item)) { | |
407 | ret = PTR_ERR(item); | |
408 | /* a csum that isn't present is a preallocated region. */ | |
409 | if (ret == -ENOENT || ret == -EFBIG) | |
410 | ret = 0; | |
ff79f819 | 411 | csum = 0; |
aadfeb6e | 412 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, start); |
07157aac CM |
413 | goto out; |
414 | } | |
ff79f819 CM |
415 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
416 | BTRFS_CRC32_SIZE); | |
d1310b2e | 417 | set_state_private(io_tree, start, csum); |
07157aac CM |
418 | out: |
419 | if (path) | |
420 | btrfs_free_path(path); | |
421 | mutex_unlock(&root->fs_info->fs_mutex); | |
422 | return ret; | |
423 | } | |
424 | ||
7e38326f CM |
425 | struct io_failure_record { |
426 | struct page *page; | |
427 | u64 start; | |
428 | u64 len; | |
429 | u64 logical; | |
430 | int last_mirror; | |
431 | }; | |
432 | ||
1259ab75 CM |
433 | int btrfs_io_failed_hook(struct bio *failed_bio, |
434 | struct page *page, u64 start, u64 end, | |
435 | struct extent_state *state) | |
7e38326f CM |
436 | { |
437 | struct io_failure_record *failrec = NULL; | |
438 | u64 private; | |
439 | struct extent_map *em; | |
440 | struct inode *inode = page->mapping->host; | |
441 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
3b951516 | 442 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
7e38326f CM |
443 | struct bio *bio; |
444 | int num_copies; | |
445 | int ret; | |
1259ab75 | 446 | int rw; |
7e38326f CM |
447 | u64 logical; |
448 | ||
449 | ret = get_state_private(failure_tree, start, &private); | |
450 | if (ret) { | |
7e38326f CM |
451 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); |
452 | if (!failrec) | |
453 | return -ENOMEM; | |
454 | failrec->start = start; | |
455 | failrec->len = end - start + 1; | |
456 | failrec->last_mirror = 0; | |
457 | ||
3b951516 CM |
458 | spin_lock(&em_tree->lock); |
459 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
460 | if (em->start > start || em->start + em->len < start) { | |
461 | free_extent_map(em); | |
462 | em = NULL; | |
463 | } | |
464 | spin_unlock(&em_tree->lock); | |
7e38326f CM |
465 | |
466 | if (!em || IS_ERR(em)) { | |
467 | kfree(failrec); | |
468 | return -EIO; | |
469 | } | |
470 | logical = start - em->start; | |
471 | logical = em->block_start + logical; | |
472 | failrec->logical = logical; | |
473 | free_extent_map(em); | |
474 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | | |
475 | EXTENT_DIRTY, GFP_NOFS); | |
587f7704 CM |
476 | set_state_private(failure_tree, start, |
477 | (u64)(unsigned long)failrec); | |
7e38326f | 478 | } else { |
587f7704 | 479 | failrec = (struct io_failure_record *)(unsigned long)private; |
7e38326f CM |
480 | } |
481 | num_copies = btrfs_num_copies( | |
482 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
483 | failrec->logical, failrec->len); | |
484 | failrec->last_mirror++; | |
485 | if (!state) { | |
486 | spin_lock_irq(&BTRFS_I(inode)->io_tree.lock); | |
487 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
488 | failrec->start, | |
489 | EXTENT_LOCKED); | |
490 | if (state && state->start != failrec->start) | |
491 | state = NULL; | |
492 | spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock); | |
493 | } | |
494 | if (!state || failrec->last_mirror > num_copies) { | |
495 | set_state_private(failure_tree, failrec->start, 0); | |
496 | clear_extent_bits(failure_tree, failrec->start, | |
497 | failrec->start + failrec->len - 1, | |
498 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
499 | kfree(failrec); | |
500 | return -EIO; | |
501 | } | |
502 | bio = bio_alloc(GFP_NOFS, 1); | |
503 | bio->bi_private = state; | |
504 | bio->bi_end_io = failed_bio->bi_end_io; | |
505 | bio->bi_sector = failrec->logical >> 9; | |
506 | bio->bi_bdev = failed_bio->bi_bdev; | |
e1c4b745 | 507 | bio->bi_size = 0; |
7e38326f | 508 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
1259ab75 CM |
509 | if (failed_bio->bi_rw & (1 << BIO_RW)) |
510 | rw = WRITE; | |
511 | else | |
512 | rw = READ; | |
513 | ||
514 | BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio, | |
515 | failrec->last_mirror); | |
516 | return 0; | |
517 | } | |
518 | ||
519 | int btrfs_clean_io_failures(struct inode *inode, u64 start) | |
520 | { | |
521 | u64 private; | |
522 | u64 private_failure; | |
523 | struct io_failure_record *failure; | |
524 | int ret; | |
525 | ||
526 | private = 0; | |
527 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
528 | (u64)-1, 1, EXTENT_DIRTY)) { | |
529 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, | |
530 | start, &private_failure); | |
531 | if (ret == 0) { | |
532 | failure = (struct io_failure_record *)(unsigned long) | |
533 | private_failure; | |
534 | set_state_private(&BTRFS_I(inode)->io_failure_tree, | |
535 | failure->start, 0); | |
536 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, | |
537 | failure->start, | |
538 | failure->start + failure->len - 1, | |
539 | EXTENT_DIRTY | EXTENT_LOCKED, | |
540 | GFP_NOFS); | |
541 | kfree(failure); | |
542 | } | |
543 | } | |
7e38326f CM |
544 | return 0; |
545 | } | |
546 | ||
70dec807 CM |
547 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
548 | struct extent_state *state) | |
07157aac | 549 | { |
35ebb934 | 550 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 551 | struct inode *inode = page->mapping->host; |
d1310b2e | 552 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 553 | char *kaddr; |
aadfeb6e | 554 | u64 private = ~(u32)0; |
07157aac | 555 | int ret; |
ff79f819 CM |
556 | struct btrfs_root *root = BTRFS_I(inode)->root; |
557 | u32 csum = ~(u32)0; | |
bbf0d006 | 558 | unsigned long flags; |
d1310b2e | 559 | |
b98b6767 Y |
560 | if (btrfs_test_opt(root, NODATASUM) || |
561 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 562 | return 0; |
c2e639f0 | 563 | if (state && state->start == start) { |
70dec807 CM |
564 | private = state->private; |
565 | ret = 0; | |
566 | } else { | |
567 | ret = get_state_private(io_tree, start, &private); | |
568 | } | |
bbf0d006 | 569 | local_irq_save(flags); |
07157aac CM |
570 | kaddr = kmap_atomic(page, KM_IRQ0); |
571 | if (ret) { | |
572 | goto zeroit; | |
573 | } | |
ff79f819 CM |
574 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
575 | btrfs_csum_final(csum, (char *)&csum); | |
576 | if (csum != private) { | |
07157aac CM |
577 | goto zeroit; |
578 | } | |
579 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 580 | local_irq_restore(flags); |
7e38326f CM |
581 | |
582 | /* if the io failure tree for this inode is non-empty, | |
583 | * check to see if we've recovered from a failed IO | |
584 | */ | |
1259ab75 | 585 | btrfs_clean_io_failures(inode, start); |
07157aac CM |
586 | return 0; |
587 | ||
588 | zeroit: | |
aadfeb6e CM |
589 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
590 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
591 | private); | |
db94535d CM |
592 | memset(kaddr + offset, 1, end - start + 1); |
593 | flush_dcache_page(page); | |
07157aac | 594 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 595 | local_irq_restore(flags); |
3b951516 CM |
596 | if (private == 0) |
597 | return 0; | |
7e38326f | 598 | return -EIO; |
07157aac | 599 | } |
b888db2b | 600 | |
39279cc3 CM |
601 | void btrfs_read_locked_inode(struct inode *inode) |
602 | { | |
603 | struct btrfs_path *path; | |
5f39d397 | 604 | struct extent_buffer *leaf; |
39279cc3 | 605 | struct btrfs_inode_item *inode_item; |
0b86a832 | 606 | struct btrfs_timespec *tspec; |
39279cc3 CM |
607 | struct btrfs_root *root = BTRFS_I(inode)->root; |
608 | struct btrfs_key location; | |
609 | u64 alloc_group_block; | |
618e21d5 | 610 | u32 rdev; |
39279cc3 CM |
611 | int ret; |
612 | ||
613 | path = btrfs_alloc_path(); | |
614 | BUG_ON(!path); | |
39279cc3 | 615 | mutex_lock(&root->fs_info->fs_mutex); |
39279cc3 | 616 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 617 | |
39279cc3 | 618 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 619 | if (ret) |
39279cc3 | 620 | goto make_bad; |
39279cc3 | 621 | |
5f39d397 CM |
622 | leaf = path->nodes[0]; |
623 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
624 | struct btrfs_inode_item); | |
625 | ||
626 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
627 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
628 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
629 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
630 | inode->i_size = btrfs_inode_size(leaf, inode_item); | |
631 | ||
632 | tspec = btrfs_inode_atime(inode_item); | |
633 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
634 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
635 | ||
636 | tspec = btrfs_inode_mtime(inode_item); | |
637 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
638 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
639 | ||
640 | tspec = btrfs_inode_ctime(inode_item); | |
641 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
642 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
643 | ||
644 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
645 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 646 | inode->i_rdev = 0; |
5f39d397 CM |
647 | rdev = btrfs_inode_rdev(leaf, inode_item); |
648 | ||
649 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); | |
39279cc3 CM |
650 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
651 | alloc_group_block); | |
b98b6767 | 652 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
653 | if (!BTRFS_I(inode)->block_group) { |
654 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
0b86a832 CM |
655 | NULL, 0, |
656 | BTRFS_BLOCK_GROUP_METADATA, 0); | |
e52ec0eb | 657 | } |
39279cc3 CM |
658 | btrfs_free_path(path); |
659 | inode_item = NULL; | |
660 | ||
661 | mutex_unlock(&root->fs_info->fs_mutex); | |
662 | ||
663 | switch (inode->i_mode & S_IFMT) { | |
39279cc3 CM |
664 | case S_IFREG: |
665 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 666 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 667 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
668 | inode->i_fop = &btrfs_file_operations; |
669 | inode->i_op = &btrfs_file_inode_operations; | |
670 | break; | |
671 | case S_IFDIR: | |
672 | inode->i_fop = &btrfs_dir_file_operations; | |
673 | if (root == root->fs_info->tree_root) | |
674 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
675 | else | |
676 | inode->i_op = &btrfs_dir_inode_operations; | |
677 | break; | |
678 | case S_IFLNK: | |
679 | inode->i_op = &btrfs_symlink_inode_operations; | |
680 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 681 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 682 | break; |
618e21d5 JB |
683 | default: |
684 | init_special_inode(inode, inode->i_mode, rdev); | |
685 | break; | |
39279cc3 CM |
686 | } |
687 | return; | |
688 | ||
689 | make_bad: | |
690 | btrfs_release_path(root, path); | |
691 | btrfs_free_path(path); | |
692 | mutex_unlock(&root->fs_info->fs_mutex); | |
693 | make_bad_inode(inode); | |
694 | } | |
695 | ||
5f39d397 CM |
696 | static void fill_inode_item(struct extent_buffer *leaf, |
697 | struct btrfs_inode_item *item, | |
39279cc3 CM |
698 | struct inode *inode) |
699 | { | |
5f39d397 CM |
700 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
701 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
702 | btrfs_set_inode_size(leaf, item, inode->i_size); | |
703 | btrfs_set_inode_mode(leaf, item, inode->i_mode); | |
704 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
705 | ||
706 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
707 | inode->i_atime.tv_sec); | |
708 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
709 | inode->i_atime.tv_nsec); | |
710 | ||
711 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
712 | inode->i_mtime.tv_sec); | |
713 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
714 | inode->i_mtime.tv_nsec); | |
715 | ||
716 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
717 | inode->i_ctime.tv_sec); | |
718 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
719 | inode->i_ctime.tv_nsec); | |
720 | ||
721 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
722 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
723 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 724 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 725 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
726 | BTRFS_I(inode)->block_group->key.objectid); |
727 | } | |
728 | ||
a52d9a80 | 729 | int btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
730 | struct btrfs_root *root, |
731 | struct inode *inode) | |
732 | { | |
733 | struct btrfs_inode_item *inode_item; | |
734 | struct btrfs_path *path; | |
5f39d397 | 735 | struct extent_buffer *leaf; |
39279cc3 CM |
736 | int ret; |
737 | ||
738 | path = btrfs_alloc_path(); | |
739 | BUG_ON(!path); | |
39279cc3 CM |
740 | ret = btrfs_lookup_inode(trans, root, path, |
741 | &BTRFS_I(inode)->location, 1); | |
742 | if (ret) { | |
743 | if (ret > 0) | |
744 | ret = -ENOENT; | |
745 | goto failed; | |
746 | } | |
747 | ||
5f39d397 CM |
748 | leaf = path->nodes[0]; |
749 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
750 | struct btrfs_inode_item); |
751 | ||
5f39d397 CM |
752 | fill_inode_item(leaf, inode_item, inode); |
753 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 754 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
755 | ret = 0; |
756 | failed: | |
757 | btrfs_release_path(root, path); | |
758 | btrfs_free_path(path); | |
759 | return ret; | |
760 | } | |
761 | ||
762 | ||
763 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
764 | struct btrfs_root *root, | |
765 | struct inode *dir, | |
766 | struct dentry *dentry) | |
767 | { | |
768 | struct btrfs_path *path; | |
769 | const char *name = dentry->d_name.name; | |
770 | int name_len = dentry->d_name.len; | |
771 | int ret = 0; | |
5f39d397 | 772 | struct extent_buffer *leaf; |
39279cc3 | 773 | struct btrfs_dir_item *di; |
5f39d397 | 774 | struct btrfs_key key; |
39279cc3 CM |
775 | |
776 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
777 | if (!path) { |
778 | ret = -ENOMEM; | |
779 | goto err; | |
780 | } | |
781 | ||
39279cc3 CM |
782 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
783 | name, name_len, -1); | |
784 | if (IS_ERR(di)) { | |
785 | ret = PTR_ERR(di); | |
786 | goto err; | |
787 | } | |
788 | if (!di) { | |
789 | ret = -ENOENT; | |
790 | goto err; | |
791 | } | |
5f39d397 CM |
792 | leaf = path->nodes[0]; |
793 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 794 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
795 | if (ret) |
796 | goto err; | |
39279cc3 CM |
797 | btrfs_release_path(root, path); |
798 | ||
799 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
5f39d397 | 800 | key.objectid, name, name_len, -1); |
39279cc3 CM |
801 | if (IS_ERR(di)) { |
802 | ret = PTR_ERR(di); | |
803 | goto err; | |
804 | } | |
805 | if (!di) { | |
806 | ret = -ENOENT; | |
807 | goto err; | |
808 | } | |
809 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
39279cc3 CM |
810 | |
811 | dentry->d_inode->i_ctime = dir->i_ctime; | |
76fea00a CM |
812 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
813 | dentry->d_inode->i_ino, | |
814 | dentry->d_parent->d_inode->i_ino); | |
815 | if (ret) { | |
816 | printk("failed to delete reference to %.*s, " | |
817 | "inode %lu parent %lu\n", name_len, name, | |
818 | dentry->d_inode->i_ino, | |
819 | dentry->d_parent->d_inode->i_ino); | |
3954401f | 820 | } |
39279cc3 CM |
821 | err: |
822 | btrfs_free_path(path); | |
823 | if (!ret) { | |
824 | dir->i_size -= name_len * 2; | |
79c44584 | 825 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 826 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
827 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
828 | dentry->d_inode->i_nlink--; | |
829 | #else | |
39279cc3 | 830 | drop_nlink(dentry->d_inode); |
6da6abae | 831 | #endif |
54aa1f4d | 832 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
833 | dir->i_sb->s_dirt = 1; |
834 | } | |
835 | return ret; | |
836 | } | |
837 | ||
838 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
839 | { | |
840 | struct btrfs_root *root; | |
841 | struct btrfs_trans_handle *trans; | |
2da98f00 | 842 | struct inode *inode = dentry->d_inode; |
39279cc3 | 843 | int ret; |
1832a6d5 | 844 | unsigned long nr = 0; |
39279cc3 CM |
845 | |
846 | root = BTRFS_I(dir)->root; | |
847 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
848 | |
849 | ret = btrfs_check_free_space(root, 1, 1); | |
850 | if (ret) | |
851 | goto fail; | |
852 | ||
39279cc3 | 853 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 854 | |
39279cc3 CM |
855 | btrfs_set_trans_block_group(trans, dir); |
856 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
d3c2fdcf | 857 | nr = trans->blocks_used; |
5f39d397 | 858 | |
2da98f00 | 859 | if (inode->i_nlink == 0) { |
2da98f00 CM |
860 | /* if the inode isn't linked anywhere, |
861 | * we don't need to worry about | |
862 | * data=ordered | |
863 | */ | |
e1b81e67 | 864 | btrfs_del_ordered_inode(inode); |
2da98f00 CM |
865 | } |
866 | ||
39279cc3 | 867 | btrfs_end_transaction(trans, root); |
1832a6d5 | 868 | fail: |
39279cc3 | 869 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 870 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 871 | btrfs_throttle(root); |
39279cc3 CM |
872 | return ret; |
873 | } | |
874 | ||
875 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
876 | { | |
877 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 878 | int err = 0; |
39279cc3 CM |
879 | int ret; |
880 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 881 | struct btrfs_trans_handle *trans; |
1832a6d5 | 882 | unsigned long nr = 0; |
39279cc3 | 883 | |
134d4512 Y |
884 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) |
885 | return -ENOTEMPTY; | |
886 | ||
39279cc3 | 887 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
888 | ret = btrfs_check_free_space(root, 1, 1); |
889 | if (ret) | |
890 | goto fail; | |
891 | ||
39279cc3 CM |
892 | trans = btrfs_start_transaction(root, 1); |
893 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 CM |
894 | |
895 | /* now the directory is empty */ | |
896 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
897 | if (!err) { | |
898 | inode->i_size = 0; | |
899 | } | |
3954401f | 900 | |
d3c2fdcf | 901 | nr = trans->blocks_used; |
39279cc3 | 902 | ret = btrfs_end_transaction(trans, root); |
1832a6d5 | 903 | fail: |
134d4512 | 904 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 905 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 906 | btrfs_throttle(root); |
3954401f | 907 | |
39279cc3 CM |
908 | if (ret && !err) |
909 | err = ret; | |
910 | return err; | |
911 | } | |
912 | ||
39279cc3 CM |
913 | /* |
914 | * this can truncate away extent items, csum items and directory items. | |
915 | * It starts at a high offset and removes keys until it can't find | |
916 | * any higher than i_size. | |
917 | * | |
918 | * csum items that cross the new i_size are truncated to the new size | |
919 | * as well. | |
920 | */ | |
921 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
922 | struct btrfs_root *root, | |
85e21bac CM |
923 | struct inode *inode, |
924 | u32 min_type) | |
39279cc3 CM |
925 | { |
926 | int ret; | |
927 | struct btrfs_path *path; | |
928 | struct btrfs_key key; | |
5f39d397 | 929 | struct btrfs_key found_key; |
39279cc3 | 930 | u32 found_type; |
5f39d397 | 931 | struct extent_buffer *leaf; |
39279cc3 CM |
932 | struct btrfs_file_extent_item *fi; |
933 | u64 extent_start = 0; | |
db94535d | 934 | u64 extent_num_bytes = 0; |
39279cc3 | 935 | u64 item_end = 0; |
7bb86316 | 936 | u64 root_gen = 0; |
d8d5f3e1 | 937 | u64 root_owner = 0; |
39279cc3 CM |
938 | int found_extent; |
939 | int del_item; | |
85e21bac CM |
940 | int pending_del_nr = 0; |
941 | int pending_del_slot = 0; | |
179e29e4 | 942 | int extent_type = -1; |
3b951516 | 943 | u64 mask = root->sectorsize - 1; |
39279cc3 | 944 | |
3b951516 | 945 | btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1); |
39279cc3 | 946 | path = btrfs_alloc_path(); |
3c69faec | 947 | path->reada = -1; |
39279cc3 | 948 | BUG_ON(!path); |
5f39d397 | 949 | |
39279cc3 CM |
950 | /* FIXME, add redo link to tree so we don't leak on crash */ |
951 | key.objectid = inode->i_ino; | |
952 | key.offset = (u64)-1; | |
5f39d397 CM |
953 | key.type = (u8)-1; |
954 | ||
85e21bac CM |
955 | btrfs_init_path(path); |
956 | search_again: | |
957 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
958 | if (ret < 0) { | |
959 | goto error; | |
960 | } | |
961 | if (ret > 0) { | |
962 | BUG_ON(path->slots[0] == 0); | |
963 | path->slots[0]--; | |
964 | } | |
965 | ||
39279cc3 | 966 | while(1) { |
39279cc3 | 967 | fi = NULL; |
5f39d397 CM |
968 | leaf = path->nodes[0]; |
969 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
970 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 971 | |
5f39d397 | 972 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 973 | break; |
5f39d397 | 974 | |
85e21bac | 975 | if (found_type < min_type) |
39279cc3 CM |
976 | break; |
977 | ||
5f39d397 | 978 | item_end = found_key.offset; |
39279cc3 | 979 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 980 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 981 | struct btrfs_file_extent_item); |
179e29e4 CM |
982 | extent_type = btrfs_file_extent_type(leaf, fi); |
983 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 984 | item_end += |
db94535d | 985 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
986 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
987 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
988 | path->slots[0]); | |
989 | item_end += btrfs_file_extent_inline_len(leaf, | |
990 | item); | |
39279cc3 | 991 | } |
008630c1 | 992 | item_end--; |
39279cc3 CM |
993 | } |
994 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
995 | ret = btrfs_csum_truncate(trans, root, path, | |
996 | inode->i_size); | |
997 | BUG_ON(ret); | |
998 | } | |
008630c1 | 999 | if (item_end < inode->i_size) { |
b888db2b CM |
1000 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
1001 | found_type = BTRFS_INODE_ITEM_KEY; | |
1002 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
1003 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
1004 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
1005 | found_type = BTRFS_XATTR_ITEM_KEY; | |
1006 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
1007 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
1008 | } else if (found_type) { |
1009 | found_type--; | |
1010 | } else { | |
1011 | break; | |
39279cc3 | 1012 | } |
a61721d5 | 1013 | btrfs_set_key_type(&key, found_type); |
85e21bac | 1014 | goto next; |
39279cc3 | 1015 | } |
5f39d397 | 1016 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
1017 | del_item = 1; |
1018 | else | |
1019 | del_item = 0; | |
1020 | found_extent = 0; | |
1021 | ||
1022 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
1023 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
1024 | goto delete; | |
1025 | ||
1026 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 1027 | u64 num_dec; |
db94535d | 1028 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 1029 | if (!del_item) { |
db94535d CM |
1030 | u64 orig_num_bytes = |
1031 | btrfs_file_extent_num_bytes(leaf, fi); | |
1032 | extent_num_bytes = inode->i_size - | |
5f39d397 | 1033 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
1034 | extent_num_bytes = extent_num_bytes & |
1035 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
1036 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1037 | extent_num_bytes); | |
1038 | num_dec = (orig_num_bytes - | |
9069218d CM |
1039 | extent_num_bytes); |
1040 | if (extent_start != 0) | |
1041 | dec_i_blocks(inode, num_dec); | |
5f39d397 | 1042 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 1043 | } else { |
db94535d CM |
1044 | extent_num_bytes = |
1045 | btrfs_file_extent_disk_num_bytes(leaf, | |
1046 | fi); | |
39279cc3 | 1047 | /* FIXME blocksize != 4096 */ |
9069218d | 1048 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
1049 | if (extent_start != 0) { |
1050 | found_extent = 1; | |
9069218d | 1051 | dec_i_blocks(inode, num_dec); |
39279cc3 | 1052 | } |
d8d5f3e1 CM |
1053 | root_gen = btrfs_header_generation(leaf); |
1054 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 1055 | } |
9069218d CM |
1056 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1057 | if (!del_item) { | |
1058 | u32 newsize = inode->i_size - found_key.offset; | |
1059 | dec_i_blocks(inode, item_end + 1 - | |
1060 | found_key.offset - newsize); | |
1061 | newsize = | |
1062 | btrfs_file_extent_calc_inline_size(newsize); | |
1063 | ret = btrfs_truncate_item(trans, root, path, | |
1064 | newsize, 1); | |
1065 | BUG_ON(ret); | |
1066 | } else { | |
1067 | dec_i_blocks(inode, item_end + 1 - | |
1068 | found_key.offset); | |
1069 | } | |
39279cc3 | 1070 | } |
179e29e4 | 1071 | delete: |
39279cc3 | 1072 | if (del_item) { |
85e21bac CM |
1073 | if (!pending_del_nr) { |
1074 | /* no pending yet, add ourselves */ | |
1075 | pending_del_slot = path->slots[0]; | |
1076 | pending_del_nr = 1; | |
1077 | } else if (pending_del_nr && | |
1078 | path->slots[0] + 1 == pending_del_slot) { | |
1079 | /* hop on the pending chunk */ | |
1080 | pending_del_nr++; | |
1081 | pending_del_slot = path->slots[0]; | |
1082 | } else { | |
1083 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
1084 | } | |
39279cc3 CM |
1085 | } else { |
1086 | break; | |
1087 | } | |
39279cc3 CM |
1088 | if (found_extent) { |
1089 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 1090 | extent_num_bytes, |
d8d5f3e1 | 1091 | root_owner, |
7bb86316 CM |
1092 | root_gen, inode->i_ino, |
1093 | found_key.offset, 0); | |
39279cc3 CM |
1094 | BUG_ON(ret); |
1095 | } | |
85e21bac CM |
1096 | next: |
1097 | if (path->slots[0] == 0) { | |
1098 | if (pending_del_nr) | |
1099 | goto del_pending; | |
1100 | btrfs_release_path(root, path); | |
1101 | goto search_again; | |
1102 | } | |
1103 | ||
1104 | path->slots[0]--; | |
1105 | if (pending_del_nr && | |
1106 | path->slots[0] + 1 != pending_del_slot) { | |
1107 | struct btrfs_key debug; | |
1108 | del_pending: | |
1109 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
1110 | pending_del_slot); | |
1111 | ret = btrfs_del_items(trans, root, path, | |
1112 | pending_del_slot, | |
1113 | pending_del_nr); | |
1114 | BUG_ON(ret); | |
1115 | pending_del_nr = 0; | |
1116 | btrfs_release_path(root, path); | |
1117 | goto search_again; | |
1118 | } | |
39279cc3 CM |
1119 | } |
1120 | ret = 0; | |
1121 | error: | |
85e21bac CM |
1122 | if (pending_del_nr) { |
1123 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
1124 | pending_del_nr); | |
1125 | } | |
39279cc3 CM |
1126 | btrfs_release_path(root, path); |
1127 | btrfs_free_path(path); | |
1128 | inode->i_sb->s_dirt = 1; | |
1129 | return ret; | |
1130 | } | |
1131 | ||
b888db2b | 1132 | static int btrfs_cow_one_page(struct inode *inode, struct page *page, |
a52d9a80 CM |
1133 | size_t zero_start) |
1134 | { | |
1135 | char *kaddr; | |
d1310b2e | 1136 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
35ebb934 | 1137 | u64 page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
b888db2b | 1138 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; |
1832a6d5 | 1139 | int ret = 0; |
a52d9a80 | 1140 | |
190662b2 | 1141 | WARN_ON(!PageLocked(page)); |
b3cfa35a | 1142 | set_page_extent_mapped(page); |
a52d9a80 | 1143 | |
d1310b2e | 1144 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 1145 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, |
b888db2b | 1146 | page_end, GFP_NOFS); |
1832a6d5 | 1147 | |
a52d9a80 | 1148 | if (zero_start != PAGE_CACHE_SIZE) { |
b888db2b | 1149 | kaddr = kmap(page); |
a52d9a80 CM |
1150 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); |
1151 | flush_dcache_page(page); | |
b888db2b | 1152 | kunmap(page); |
a52d9a80 | 1153 | } |
b888db2b | 1154 | set_page_dirty(page); |
d1310b2e | 1155 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
a52d9a80 | 1156 | |
a52d9a80 CM |
1157 | return ret; |
1158 | } | |
1159 | ||
39279cc3 CM |
1160 | /* |
1161 | * taken from block_truncate_page, but does cow as it zeros out | |
1162 | * any bytes left in the last page in the file. | |
1163 | */ | |
1164 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
1165 | { | |
1166 | struct inode *inode = mapping->host; | |
db94535d CM |
1167 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1168 | u32 blocksize = root->sectorsize; | |
39279cc3 CM |
1169 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
1170 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
1171 | struct page *page; | |
39279cc3 | 1172 | int ret = 0; |
a52d9a80 | 1173 | u64 page_start; |
39279cc3 CM |
1174 | |
1175 | if ((offset & (blocksize - 1)) == 0) | |
1176 | goto out; | |
1177 | ||
1178 | ret = -ENOMEM; | |
211c17f5 | 1179 | again: |
39279cc3 CM |
1180 | page = grab_cache_page(mapping, index); |
1181 | if (!page) | |
1182 | goto out; | |
39279cc3 | 1183 | if (!PageUptodate(page)) { |
9ebefb18 | 1184 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 1185 | lock_page(page); |
211c17f5 CM |
1186 | if (page->mapping != mapping) { |
1187 | unlock_page(page); | |
1188 | page_cache_release(page); | |
1189 | goto again; | |
1190 | } | |
39279cc3 CM |
1191 | if (!PageUptodate(page)) { |
1192 | ret = -EIO; | |
1193 | goto out; | |
1194 | } | |
1195 | } | |
a52d9a80 | 1196 | |
211c17f5 CM |
1197 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
1198 | wait_on_page_writeback(page); | |
b888db2b | 1199 | ret = btrfs_cow_one_page(inode, page, offset); |
39279cc3 | 1200 | |
39279cc3 CM |
1201 | unlock_page(page); |
1202 | page_cache_release(page); | |
1203 | out: | |
1204 | return ret; | |
1205 | } | |
1206 | ||
1207 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1208 | { | |
1209 | struct inode *inode = dentry->d_inode; | |
1210 | int err; | |
1211 | ||
1212 | err = inode_change_ok(inode, attr); | |
1213 | if (err) | |
1214 | return err; | |
1215 | ||
1216 | if (S_ISREG(inode->i_mode) && | |
1217 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1218 | struct btrfs_trans_handle *trans; | |
1219 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1220 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1221 | |
5f39d397 | 1222 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1223 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1224 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1225 | u64 hole_size; |
179e29e4 | 1226 | u64 alloc_hint = 0; |
39279cc3 | 1227 | |
1b0f7c29 | 1228 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1229 | goto out; |
1230 | ||
1832a6d5 CM |
1231 | mutex_lock(&root->fs_info->fs_mutex); |
1232 | err = btrfs_check_free_space(root, 1, 0); | |
1233 | mutex_unlock(&root->fs_info->fs_mutex); | |
1234 | if (err) | |
1235 | goto fail; | |
1236 | ||
39279cc3 CM |
1237 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1238 | ||
1b0f7c29 | 1239 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
5f56406a | 1240 | hole_size = block_end - hole_start; |
39279cc3 CM |
1241 | |
1242 | mutex_lock(&root->fs_info->fs_mutex); | |
1243 | trans = btrfs_start_transaction(root, 1); | |
1244 | btrfs_set_trans_block_group(trans, inode); | |
2bf5a725 | 1245 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1246 | hole_start, block_end, hole_start, |
3326d1b0 | 1247 | &alloc_hint); |
2bf5a725 | 1248 | |
179e29e4 CM |
1249 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1250 | err = btrfs_insert_file_extent(trans, root, | |
1251 | inode->i_ino, | |
5f56406a | 1252 | hole_start, 0, 0, |
f2eb0a24 | 1253 | hole_size, 0); |
d1310b2e | 1254 | btrfs_drop_extent_cache(inode, hole_start, |
3b951516 | 1255 | (u64)-1); |
5f56406a | 1256 | btrfs_check_file(root, inode); |
179e29e4 | 1257 | } |
39279cc3 CM |
1258 | btrfs_end_transaction(trans, root); |
1259 | mutex_unlock(&root->fs_info->fs_mutex); | |
1b0f7c29 | 1260 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1261 | if (err) |
1262 | return err; | |
39279cc3 CM |
1263 | } |
1264 | out: | |
1265 | err = inode_setattr(inode, attr); | |
1832a6d5 | 1266 | fail: |
39279cc3 CM |
1267 | return err; |
1268 | } | |
61295eb8 | 1269 | |
39279cc3 CM |
1270 | void btrfs_delete_inode(struct inode *inode) |
1271 | { | |
1272 | struct btrfs_trans_handle *trans; | |
1273 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1274 | unsigned long nr; |
39279cc3 CM |
1275 | int ret; |
1276 | ||
1277 | truncate_inode_pages(&inode->i_data, 0); | |
1278 | if (is_bad_inode(inode)) { | |
1279 | goto no_delete; | |
1280 | } | |
5f39d397 | 1281 | |
39279cc3 CM |
1282 | inode->i_size = 0; |
1283 | mutex_lock(&root->fs_info->fs_mutex); | |
1284 | trans = btrfs_start_transaction(root, 1); | |
5f39d397 | 1285 | |
39279cc3 | 1286 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1287 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
54aa1f4d CM |
1288 | if (ret) |
1289 | goto no_delete_lock; | |
85e21bac | 1290 | |
d3c2fdcf | 1291 | nr = trans->blocks_used; |
85e21bac | 1292 | clear_inode(inode); |
5f39d397 | 1293 | |
39279cc3 CM |
1294 | btrfs_end_transaction(trans, root); |
1295 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1296 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1297 | btrfs_throttle(root); |
39279cc3 | 1298 | return; |
54aa1f4d CM |
1299 | |
1300 | no_delete_lock: | |
d3c2fdcf | 1301 | nr = trans->blocks_used; |
54aa1f4d CM |
1302 | btrfs_end_transaction(trans, root); |
1303 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 1304 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1305 | btrfs_throttle(root); |
39279cc3 CM |
1306 | no_delete: |
1307 | clear_inode(inode); | |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * this returns the key found in the dir entry in the location pointer. | |
1312 | * If no dir entries were found, location->objectid is 0. | |
1313 | */ | |
1314 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1315 | struct btrfs_key *location) | |
1316 | { | |
1317 | const char *name = dentry->d_name.name; | |
1318 | int namelen = dentry->d_name.len; | |
1319 | struct btrfs_dir_item *di; | |
1320 | struct btrfs_path *path; | |
1321 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1322 | int ret = 0; |
39279cc3 | 1323 | |
3954401f CM |
1324 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1325 | location->objectid = dir->i_ino; | |
1326 | location->type = BTRFS_INODE_ITEM_KEY; | |
1327 | location->offset = 0; | |
1328 | return 0; | |
1329 | } | |
39279cc3 CM |
1330 | path = btrfs_alloc_path(); |
1331 | BUG_ON(!path); | |
3954401f | 1332 | |
7a720536 | 1333 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1334 | struct btrfs_key key; |
1335 | struct extent_buffer *leaf; | |
1336 | u32 nritems; | |
1337 | int slot; | |
1338 | ||
1339 | key.objectid = dir->i_ino; | |
1340 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1341 | key.offset = 0; | |
1342 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1343 | BUG_ON(ret == 0); | |
1344 | ret = 0; | |
1345 | ||
1346 | leaf = path->nodes[0]; | |
1347 | slot = path->slots[0]; | |
1348 | nritems = btrfs_header_nritems(leaf); | |
1349 | if (slot >= nritems) | |
1350 | goto out_err; | |
1351 | ||
1352 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1353 | if (key.objectid != dir->i_ino || | |
1354 | key.type != BTRFS_INODE_REF_KEY) { | |
1355 | goto out_err; | |
1356 | } | |
1357 | location->objectid = key.offset; | |
1358 | location->type = BTRFS_INODE_ITEM_KEY; | |
1359 | location->offset = 0; | |
1360 | goto out; | |
1361 | } | |
1362 | ||
39279cc3 CM |
1363 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1364 | namelen, 0); | |
0d9f7f3e Y |
1365 | if (IS_ERR(di)) |
1366 | ret = PTR_ERR(di); | |
39279cc3 | 1367 | if (!di || IS_ERR(di)) { |
3954401f | 1368 | goto out_err; |
39279cc3 | 1369 | } |
5f39d397 | 1370 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1371 | out: |
39279cc3 CM |
1372 | btrfs_free_path(path); |
1373 | return ret; | |
3954401f CM |
1374 | out_err: |
1375 | location->objectid = 0; | |
1376 | goto out; | |
39279cc3 CM |
1377 | } |
1378 | ||
1379 | /* | |
1380 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1381 | * needs to be changed to reflect the root directory of the tree root. This | |
1382 | * is kind of like crossing a mount point. | |
1383 | */ | |
1384 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1385 | struct btrfs_key *location, | |
58176a96 JB |
1386 | struct btrfs_root **sub_root, |
1387 | struct dentry *dentry) | |
39279cc3 CM |
1388 | { |
1389 | struct btrfs_path *path; | |
1390 | struct btrfs_root_item *ri; | |
1391 | ||
1392 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1393 | return 0; | |
1394 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1395 | return 0; | |
1396 | ||
1397 | path = btrfs_alloc_path(); | |
1398 | BUG_ON(!path); | |
1399 | mutex_lock(&root->fs_info->fs_mutex); | |
1400 | ||
58176a96 JB |
1401 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1402 | dentry->d_name.name, | |
1403 | dentry->d_name.len); | |
39279cc3 CM |
1404 | if (IS_ERR(*sub_root)) |
1405 | return PTR_ERR(*sub_root); | |
1406 | ||
1407 | ri = &(*sub_root)->root_item; | |
1408 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1409 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1410 | location->offset = 0; | |
1411 | ||
1412 | btrfs_free_path(path); | |
1413 | mutex_unlock(&root->fs_info->fs_mutex); | |
1414 | return 0; | |
1415 | } | |
1416 | ||
1417 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1418 | { | |
1419 | struct btrfs_iget_args *args = p; | |
1420 | inode->i_ino = args->ino; | |
1421 | BTRFS_I(inode)->root = args->root; | |
9069218d | 1422 | BTRFS_I(inode)->delalloc_bytes = 0; |
d1310b2e CM |
1423 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1424 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1425 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1426 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1427 | inode->i_mapping, GFP_NOFS); | |
81d7ed29 | 1428 | atomic_set(&BTRFS_I(inode)->ordered_writeback, 0); |
39279cc3 CM |
1429 | return 0; |
1430 | } | |
1431 | ||
1432 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1433 | { | |
1434 | struct btrfs_iget_args *args = opaque; | |
1435 | return (args->ino == inode->i_ino && | |
1436 | args->root == BTRFS_I(inode)->root); | |
1437 | } | |
1438 | ||
dc17ff8f CM |
1439 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1440 | u64 root_objectid) | |
1441 | { | |
1442 | struct btrfs_iget_args args; | |
1443 | args.ino = objectid; | |
1444 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1445 | ||
1446 | if (!args.root) | |
1447 | return NULL; | |
1448 | ||
1449 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1450 | } | |
1451 | ||
39279cc3 CM |
1452 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1453 | struct btrfs_root *root) | |
1454 | { | |
1455 | struct inode *inode; | |
1456 | struct btrfs_iget_args args; | |
1457 | args.ino = objectid; | |
1458 | args.root = root; | |
1459 | ||
1460 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1461 | btrfs_init_locked_inode, | |
1462 | (void *)&args); | |
1463 | return inode; | |
1464 | } | |
1465 | ||
1466 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1467 | struct nameidata *nd) | |
1468 | { | |
1469 | struct inode * inode; | |
1470 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1471 | struct btrfs_root *root = bi->root; | |
1472 | struct btrfs_root *sub_root = root; | |
1473 | struct btrfs_key location; | |
1474 | int ret; | |
1475 | ||
1476 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1477 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1478 | |
39279cc3 CM |
1479 | mutex_lock(&root->fs_info->fs_mutex); |
1480 | ret = btrfs_inode_by_name(dir, dentry, &location); | |
1481 | mutex_unlock(&root->fs_info->fs_mutex); | |
5f39d397 | 1482 | |
39279cc3 CM |
1483 | if (ret < 0) |
1484 | return ERR_PTR(ret); | |
5f39d397 | 1485 | |
39279cc3 CM |
1486 | inode = NULL; |
1487 | if (location.objectid) { | |
58176a96 JB |
1488 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1489 | dentry); | |
39279cc3 CM |
1490 | if (ret < 0) |
1491 | return ERR_PTR(ret); | |
1492 | if (ret > 0) | |
1493 | return ERR_PTR(-ENOENT); | |
1494 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, | |
1495 | sub_root); | |
1496 | if (!inode) | |
1497 | return ERR_PTR(-EACCES); | |
1498 | if (inode->i_state & I_NEW) { | |
1499 | /* the inode and parent dir are two different roots */ | |
1500 | if (sub_root != root) { | |
1501 | igrab(inode); | |
1502 | sub_root->inode = inode; | |
1503 | } | |
1504 | BTRFS_I(inode)->root = sub_root; | |
1505 | memcpy(&BTRFS_I(inode)->location, &location, | |
1506 | sizeof(location)); | |
1507 | btrfs_read_locked_inode(inode); | |
1508 | unlock_new_inode(inode); | |
1509 | } | |
1510 | } | |
1511 | return d_splice_alias(inode, dentry); | |
1512 | } | |
1513 | ||
39279cc3 CM |
1514 | static unsigned char btrfs_filetype_table[] = { |
1515 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1516 | }; | |
1517 | ||
1518 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1519 | { | |
6da6abae | 1520 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1521 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1522 | struct btrfs_item *item; | |
1523 | struct btrfs_dir_item *di; | |
1524 | struct btrfs_key key; | |
5f39d397 | 1525 | struct btrfs_key found_key; |
39279cc3 CM |
1526 | struct btrfs_path *path; |
1527 | int ret; | |
1528 | u32 nritems; | |
5f39d397 | 1529 | struct extent_buffer *leaf; |
39279cc3 CM |
1530 | int slot; |
1531 | int advance; | |
1532 | unsigned char d_type; | |
1533 | int over = 0; | |
1534 | u32 di_cur; | |
1535 | u32 di_total; | |
1536 | u32 di_len; | |
1537 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1538 | char tmp_name[32]; |
1539 | char *name_ptr; | |
1540 | int name_len; | |
39279cc3 CM |
1541 | |
1542 | /* FIXME, use a real flag for deciding about the key type */ | |
1543 | if (root->fs_info->tree_root == root) | |
1544 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1545 | |
3954401f CM |
1546 | /* special case for "." */ |
1547 | if (filp->f_pos == 0) { | |
1548 | over = filldir(dirent, ".", 1, | |
1549 | 1, inode->i_ino, | |
1550 | DT_DIR); | |
1551 | if (over) | |
1552 | return 0; | |
1553 | filp->f_pos = 1; | |
1554 | } | |
1555 | ||
39279cc3 CM |
1556 | mutex_lock(&root->fs_info->fs_mutex); |
1557 | key.objectid = inode->i_ino; | |
3954401f CM |
1558 | path = btrfs_alloc_path(); |
1559 | path->reada = 2; | |
1560 | ||
1561 | /* special case for .., just use the back ref */ | |
1562 | if (filp->f_pos == 1) { | |
1563 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1564 | key.offset = 0; | |
1565 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1566 | BUG_ON(ret == 0); | |
1567 | leaf = path->nodes[0]; | |
1568 | slot = path->slots[0]; | |
1569 | nritems = btrfs_header_nritems(leaf); | |
1570 | if (slot >= nritems) { | |
1571 | btrfs_release_path(root, path); | |
1572 | goto read_dir_items; | |
1573 | } | |
1574 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1575 | btrfs_release_path(root, path); | |
1576 | if (found_key.objectid != key.objectid || | |
1577 | found_key.type != BTRFS_INODE_REF_KEY) | |
1578 | goto read_dir_items; | |
1579 | over = filldir(dirent, "..", 2, | |
1580 | 2, found_key.offset, DT_DIR); | |
1581 | if (over) | |
1582 | goto nopos; | |
1583 | filp->f_pos = 2; | |
1584 | } | |
1585 | ||
1586 | read_dir_items: | |
39279cc3 CM |
1587 | btrfs_set_key_type(&key, key_type); |
1588 | key.offset = filp->f_pos; | |
5f39d397 | 1589 | |
39279cc3 CM |
1590 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1591 | if (ret < 0) | |
1592 | goto err; | |
1593 | advance = 0; | |
39279cc3 | 1594 | while(1) { |
5f39d397 CM |
1595 | leaf = path->nodes[0]; |
1596 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1597 | slot = path->slots[0]; |
1598 | if (advance || slot >= nritems) { | |
1599 | if (slot >= nritems -1) { | |
39279cc3 CM |
1600 | ret = btrfs_next_leaf(root, path); |
1601 | if (ret) | |
1602 | break; | |
5f39d397 CM |
1603 | leaf = path->nodes[0]; |
1604 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1605 | slot = path->slots[0]; |
1606 | } else { | |
1607 | slot++; | |
1608 | path->slots[0]++; | |
1609 | } | |
1610 | } | |
1611 | advance = 1; | |
5f39d397 CM |
1612 | item = btrfs_item_nr(leaf, slot); |
1613 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1614 | ||
1615 | if (found_key.objectid != key.objectid) | |
39279cc3 | 1616 | break; |
5f39d397 | 1617 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 1618 | break; |
5f39d397 | 1619 | if (found_key.offset < filp->f_pos) |
39279cc3 | 1620 | continue; |
5f39d397 CM |
1621 | |
1622 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
1623 | advance = 1; |
1624 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
1625 | di_cur = 0; | |
5f39d397 | 1626 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 1627 | while(di_cur < di_total) { |
5f39d397 CM |
1628 | struct btrfs_key location; |
1629 | ||
1630 | name_len = btrfs_dir_name_len(leaf, di); | |
1631 | if (name_len < 32) { | |
1632 | name_ptr = tmp_name; | |
1633 | } else { | |
1634 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
1635 | BUG_ON(!name_ptr); | |
1636 | } | |
1637 | read_extent_buffer(leaf, name_ptr, | |
1638 | (unsigned long)(di + 1), name_len); | |
1639 | ||
1640 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
1641 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
1642 | over = filldir(dirent, name_ptr, name_len, |
1643 | found_key.offset, | |
1644 | location.objectid, | |
39279cc3 | 1645 | d_type); |
5f39d397 CM |
1646 | |
1647 | if (name_ptr != tmp_name) | |
1648 | kfree(name_ptr); | |
1649 | ||
39279cc3 CM |
1650 | if (over) |
1651 | goto nopos; | |
5103e947 JB |
1652 | di_len = btrfs_dir_name_len(leaf, di) + |
1653 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
1654 | di_cur += di_len; |
1655 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
1656 | } | |
1657 | } | |
5e591a07 YZ |
1658 | if (key_type == BTRFS_DIR_INDEX_KEY) |
1659 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
1660 | else | |
1661 | filp->f_pos++; | |
39279cc3 CM |
1662 | nopos: |
1663 | ret = 0; | |
1664 | err: | |
1665 | btrfs_release_path(root, path); | |
1666 | btrfs_free_path(path); | |
1667 | mutex_unlock(&root->fs_info->fs_mutex); | |
1668 | return ret; | |
1669 | } | |
1670 | ||
1671 | int btrfs_write_inode(struct inode *inode, int wait) | |
1672 | { | |
1673 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1674 | struct btrfs_trans_handle *trans; | |
1675 | int ret = 0; | |
1676 | ||
1677 | if (wait) { | |
1678 | mutex_lock(&root->fs_info->fs_mutex); | |
1679 | trans = btrfs_start_transaction(root, 1); | |
1680 | btrfs_set_trans_block_group(trans, inode); | |
1681 | ret = btrfs_commit_transaction(trans, root); | |
1682 | mutex_unlock(&root->fs_info->fs_mutex); | |
1683 | } | |
1684 | return ret; | |
1685 | } | |
1686 | ||
1687 | /* | |
54aa1f4d | 1688 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
1689 | * inode changes. But, it is most likely to find the inode in cache. |
1690 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
1691 | * to keep or drop this code. | |
1692 | */ | |
1693 | void btrfs_dirty_inode(struct inode *inode) | |
1694 | { | |
1695 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
1696 | struct btrfs_trans_handle *trans; | |
1697 | ||
1698 | mutex_lock(&root->fs_info->fs_mutex); | |
1699 | trans = btrfs_start_transaction(root, 1); | |
1700 | btrfs_set_trans_block_group(trans, inode); | |
1701 | btrfs_update_inode(trans, root, inode); | |
1702 | btrfs_end_transaction(trans, root); | |
1703 | mutex_unlock(&root->fs_info->fs_mutex); | |
39279cc3 CM |
1704 | } |
1705 | ||
1706 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, | |
1707 | struct btrfs_root *root, | |
9c58309d CM |
1708 | const char *name, int name_len, |
1709 | u64 ref_objectid, | |
39279cc3 CM |
1710 | u64 objectid, |
1711 | struct btrfs_block_group_cache *group, | |
1712 | int mode) | |
1713 | { | |
1714 | struct inode *inode; | |
5f39d397 | 1715 | struct btrfs_inode_item *inode_item; |
6324fbf3 | 1716 | struct btrfs_block_group_cache *new_inode_group; |
39279cc3 | 1717 | struct btrfs_key *location; |
5f39d397 | 1718 | struct btrfs_path *path; |
9c58309d CM |
1719 | struct btrfs_inode_ref *ref; |
1720 | struct btrfs_key key[2]; | |
1721 | u32 sizes[2]; | |
1722 | unsigned long ptr; | |
39279cc3 CM |
1723 | int ret; |
1724 | int owner; | |
1725 | ||
5f39d397 CM |
1726 | path = btrfs_alloc_path(); |
1727 | BUG_ON(!path); | |
1728 | ||
39279cc3 CM |
1729 | inode = new_inode(root->fs_info->sb); |
1730 | if (!inode) | |
1731 | return ERR_PTR(-ENOMEM); | |
1732 | ||
d1310b2e CM |
1733 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1734 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1735 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1736 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1737 | inode->i_mapping, GFP_NOFS); | |
81d7ed29 | 1738 | atomic_set(&BTRFS_I(inode)->ordered_writeback, 0); |
9069218d | 1739 | BTRFS_I(inode)->delalloc_bytes = 0; |
39279cc3 | 1740 | BTRFS_I(inode)->root = root; |
b888db2b | 1741 | |
39279cc3 CM |
1742 | if (mode & S_IFDIR) |
1743 | owner = 0; | |
1744 | else | |
1745 | owner = 1; | |
6324fbf3 | 1746 | new_inode_group = btrfs_find_block_group(root, group, 0, |
0b86a832 | 1747 | BTRFS_BLOCK_GROUP_METADATA, owner); |
6324fbf3 CM |
1748 | if (!new_inode_group) { |
1749 | printk("find_block group failed\n"); | |
1750 | new_inode_group = group; | |
1751 | } | |
1752 | BTRFS_I(inode)->block_group = new_inode_group; | |
b98b6767 | 1753 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
1754 | |
1755 | key[0].objectid = objectid; | |
1756 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
1757 | key[0].offset = 0; | |
1758 | ||
1759 | key[1].objectid = objectid; | |
1760 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
1761 | key[1].offset = ref_objectid; | |
1762 | ||
1763 | sizes[0] = sizeof(struct btrfs_inode_item); | |
1764 | sizes[1] = name_len + sizeof(*ref); | |
1765 | ||
1766 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
1767 | if (ret != 0) | |
5f39d397 CM |
1768 | goto fail; |
1769 | ||
9c58309d CM |
1770 | if (objectid > root->highest_inode) |
1771 | root->highest_inode = objectid; | |
1772 | ||
39279cc3 CM |
1773 | inode->i_uid = current->fsuid; |
1774 | inode->i_gid = current->fsgid; | |
1775 | inode->i_mode = mode; | |
1776 | inode->i_ino = objectid; | |
1777 | inode->i_blocks = 0; | |
1778 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
1779 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
1780 | struct btrfs_inode_item); | |
1781 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
1782 | |
1783 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
1784 | struct btrfs_inode_ref); | |
1785 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
1786 | ptr = (unsigned long)(ref + 1); | |
1787 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
1788 | ||
5f39d397 CM |
1789 | btrfs_mark_buffer_dirty(path->nodes[0]); |
1790 | btrfs_free_path(path); | |
1791 | ||
39279cc3 CM |
1792 | location = &BTRFS_I(inode)->location; |
1793 | location->objectid = objectid; | |
39279cc3 CM |
1794 | location->offset = 0; |
1795 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
1796 | ||
39279cc3 CM |
1797 | insert_inode_hash(inode); |
1798 | return inode; | |
5f39d397 CM |
1799 | fail: |
1800 | btrfs_free_path(path); | |
1801 | return ERR_PTR(ret); | |
39279cc3 CM |
1802 | } |
1803 | ||
1804 | static inline u8 btrfs_inode_type(struct inode *inode) | |
1805 | { | |
1806 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
1807 | } | |
1808 | ||
1809 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1810 | struct dentry *dentry, struct inode *inode, |
1811 | int add_backref) | |
39279cc3 CM |
1812 | { |
1813 | int ret; | |
1814 | struct btrfs_key key; | |
1815 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
79c44584 | 1816 | struct inode *parent_inode; |
5f39d397 | 1817 | |
39279cc3 | 1818 | key.objectid = inode->i_ino; |
39279cc3 CM |
1819 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
1820 | key.offset = 0; | |
1821 | ||
1822 | ret = btrfs_insert_dir_item(trans, root, | |
1823 | dentry->d_name.name, dentry->d_name.len, | |
1824 | dentry->d_parent->d_inode->i_ino, | |
1825 | &key, btrfs_inode_type(inode)); | |
1826 | if (ret == 0) { | |
9c58309d CM |
1827 | if (add_backref) { |
1828 | ret = btrfs_insert_inode_ref(trans, root, | |
1829 | dentry->d_name.name, | |
1830 | dentry->d_name.len, | |
1831 | inode->i_ino, | |
1832 | dentry->d_parent->d_inode->i_ino); | |
1833 | } | |
79c44584 CM |
1834 | parent_inode = dentry->d_parent->d_inode; |
1835 | parent_inode->i_size += dentry->d_name.len * 2; | |
1836 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; | |
39279cc3 CM |
1837 | ret = btrfs_update_inode(trans, root, |
1838 | dentry->d_parent->d_inode); | |
1839 | } | |
1840 | return ret; | |
1841 | } | |
1842 | ||
1843 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d CM |
1844 | struct dentry *dentry, struct inode *inode, |
1845 | int backref) | |
39279cc3 | 1846 | { |
9c58309d | 1847 | int err = btrfs_add_link(trans, dentry, inode, backref); |
39279cc3 CM |
1848 | if (!err) { |
1849 | d_instantiate(dentry, inode); | |
1850 | return 0; | |
1851 | } | |
1852 | if (err > 0) | |
1853 | err = -EEXIST; | |
1854 | return err; | |
1855 | } | |
1856 | ||
618e21d5 JB |
1857 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
1858 | int mode, dev_t rdev) | |
1859 | { | |
1860 | struct btrfs_trans_handle *trans; | |
1861 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1862 | struct inode *inode = NULL; |
618e21d5 JB |
1863 | int err; |
1864 | int drop_inode = 0; | |
1865 | u64 objectid; | |
1832a6d5 | 1866 | unsigned long nr = 0; |
618e21d5 JB |
1867 | |
1868 | if (!new_valid_dev(rdev)) | |
1869 | return -EINVAL; | |
1870 | ||
1871 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1872 | err = btrfs_check_free_space(root, 1, 0); |
1873 | if (err) | |
1874 | goto fail; | |
1875 | ||
618e21d5 JB |
1876 | trans = btrfs_start_transaction(root, 1); |
1877 | btrfs_set_trans_block_group(trans, dir); | |
1878 | ||
1879 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1880 | if (err) { | |
1881 | err = -ENOSPC; | |
1882 | goto out_unlock; | |
1883 | } | |
1884 | ||
9c58309d CM |
1885 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1886 | dentry->d_name.len, | |
1887 | dentry->d_parent->d_inode->i_ino, objectid, | |
618e21d5 JB |
1888 | BTRFS_I(dir)->block_group, mode); |
1889 | err = PTR_ERR(inode); | |
1890 | if (IS_ERR(inode)) | |
1891 | goto out_unlock; | |
1892 | ||
1893 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1894 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
618e21d5 JB |
1895 | if (err) |
1896 | drop_inode = 1; | |
1897 | else { | |
1898 | inode->i_op = &btrfs_special_inode_operations; | |
1899 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 1900 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
1901 | } |
1902 | dir->i_sb->s_dirt = 1; | |
1903 | btrfs_update_inode_block_group(trans, inode); | |
1904 | btrfs_update_inode_block_group(trans, dir); | |
1905 | out_unlock: | |
d3c2fdcf | 1906 | nr = trans->blocks_used; |
618e21d5 | 1907 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1908 | fail: |
618e21d5 JB |
1909 | mutex_unlock(&root->fs_info->fs_mutex); |
1910 | ||
1911 | if (drop_inode) { | |
1912 | inode_dec_link_count(inode); | |
1913 | iput(inode); | |
1914 | } | |
d3c2fdcf | 1915 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1916 | btrfs_throttle(root); |
618e21d5 JB |
1917 | return err; |
1918 | } | |
1919 | ||
39279cc3 CM |
1920 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
1921 | int mode, struct nameidata *nd) | |
1922 | { | |
1923 | struct btrfs_trans_handle *trans; | |
1924 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 1925 | struct inode *inode = NULL; |
39279cc3 CM |
1926 | int err; |
1927 | int drop_inode = 0; | |
1832a6d5 | 1928 | unsigned long nr = 0; |
39279cc3 CM |
1929 | u64 objectid; |
1930 | ||
1931 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
1932 | err = btrfs_check_free_space(root, 1, 0); |
1933 | if (err) | |
1934 | goto fail; | |
39279cc3 CM |
1935 | trans = btrfs_start_transaction(root, 1); |
1936 | btrfs_set_trans_block_group(trans, dir); | |
1937 | ||
1938 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
1939 | if (err) { | |
1940 | err = -ENOSPC; | |
1941 | goto out_unlock; | |
1942 | } | |
1943 | ||
9c58309d CM |
1944 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
1945 | dentry->d_name.len, | |
1946 | dentry->d_parent->d_inode->i_ino, | |
1947 | objectid, BTRFS_I(dir)->block_group, mode); | |
39279cc3 CM |
1948 | err = PTR_ERR(inode); |
1949 | if (IS_ERR(inode)) | |
1950 | goto out_unlock; | |
1951 | ||
1952 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 1953 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
1954 | if (err) |
1955 | drop_inode = 1; | |
1956 | else { | |
1957 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 1958 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
1959 | inode->i_fop = &btrfs_file_operations; |
1960 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
1961 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1962 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 1963 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1964 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1965 | inode->i_mapping, GFP_NOFS); | |
9069218d | 1966 | BTRFS_I(inode)->delalloc_bytes = 0; |
81d7ed29 | 1967 | atomic_set(&BTRFS_I(inode)->ordered_writeback, 0); |
d1310b2e | 1968 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1969 | } |
1970 | dir->i_sb->s_dirt = 1; | |
1971 | btrfs_update_inode_block_group(trans, inode); | |
1972 | btrfs_update_inode_block_group(trans, dir); | |
1973 | out_unlock: | |
d3c2fdcf | 1974 | nr = trans->blocks_used; |
39279cc3 | 1975 | btrfs_end_transaction(trans, root); |
1832a6d5 | 1976 | fail: |
39279cc3 CM |
1977 | mutex_unlock(&root->fs_info->fs_mutex); |
1978 | ||
1979 | if (drop_inode) { | |
1980 | inode_dec_link_count(inode); | |
1981 | iput(inode); | |
1982 | } | |
d3c2fdcf | 1983 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 1984 | btrfs_throttle(root); |
39279cc3 CM |
1985 | return err; |
1986 | } | |
1987 | ||
1988 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
1989 | struct dentry *dentry) | |
1990 | { | |
1991 | struct btrfs_trans_handle *trans; | |
1992 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1993 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 1994 | unsigned long nr = 0; |
39279cc3 CM |
1995 | int err; |
1996 | int drop_inode = 0; | |
1997 | ||
1998 | if (inode->i_nlink == 0) | |
1999 | return -ENOENT; | |
2000 | ||
6da6abae CM |
2001 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
2002 | inode->i_nlink++; | |
2003 | #else | |
39279cc3 | 2004 | inc_nlink(inode); |
6da6abae | 2005 | #endif |
39279cc3 | 2006 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2007 | err = btrfs_check_free_space(root, 1, 0); |
2008 | if (err) | |
2009 | goto fail; | |
39279cc3 | 2010 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2011 | |
39279cc3 CM |
2012 | btrfs_set_trans_block_group(trans, dir); |
2013 | atomic_inc(&inode->i_count); | |
9c58309d | 2014 | err = btrfs_add_nondir(trans, dentry, inode, 1); |
5f39d397 | 2015 | |
39279cc3 CM |
2016 | if (err) |
2017 | drop_inode = 1; | |
5f39d397 | 2018 | |
39279cc3 CM |
2019 | dir->i_sb->s_dirt = 1; |
2020 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 2021 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 2022 | |
54aa1f4d CM |
2023 | if (err) |
2024 | drop_inode = 1; | |
39279cc3 | 2025 | |
d3c2fdcf | 2026 | nr = trans->blocks_used; |
39279cc3 | 2027 | btrfs_end_transaction(trans, root); |
1832a6d5 | 2028 | fail: |
39279cc3 CM |
2029 | mutex_unlock(&root->fs_info->fs_mutex); |
2030 | ||
2031 | if (drop_inode) { | |
2032 | inode_dec_link_count(inode); | |
2033 | iput(inode); | |
2034 | } | |
d3c2fdcf | 2035 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2036 | btrfs_throttle(root); |
39279cc3 CM |
2037 | return err; |
2038 | } | |
2039 | ||
39279cc3 CM |
2040 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2041 | { | |
b9d86667 | 2042 | struct inode *inode = NULL; |
39279cc3 CM |
2043 | struct btrfs_trans_handle *trans; |
2044 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2045 | int err = 0; | |
2046 | int drop_on_err = 0; | |
b9d86667 | 2047 | u64 objectid = 0; |
d3c2fdcf | 2048 | unsigned long nr = 1; |
39279cc3 CM |
2049 | |
2050 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2051 | err = btrfs_check_free_space(root, 1, 0); |
2052 | if (err) | |
2053 | goto out_unlock; | |
2054 | ||
39279cc3 CM |
2055 | trans = btrfs_start_transaction(root, 1); |
2056 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 2057 | |
39279cc3 CM |
2058 | if (IS_ERR(trans)) { |
2059 | err = PTR_ERR(trans); | |
2060 | goto out_unlock; | |
2061 | } | |
2062 | ||
2063 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2064 | if (err) { | |
2065 | err = -ENOSPC; | |
2066 | goto out_unlock; | |
2067 | } | |
2068 | ||
9c58309d CM |
2069 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
2070 | dentry->d_name.len, | |
2071 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2072 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
2073 | if (IS_ERR(inode)) { | |
2074 | err = PTR_ERR(inode); | |
2075 | goto out_fail; | |
2076 | } | |
5f39d397 | 2077 | |
39279cc3 CM |
2078 | drop_on_err = 1; |
2079 | inode->i_op = &btrfs_dir_inode_operations; | |
2080 | inode->i_fop = &btrfs_dir_file_operations; | |
2081 | btrfs_set_trans_block_group(trans, inode); | |
2082 | ||
3954401f | 2083 | inode->i_size = 0; |
39279cc3 CM |
2084 | err = btrfs_update_inode(trans, root, inode); |
2085 | if (err) | |
2086 | goto out_fail; | |
5f39d397 | 2087 | |
9c58309d | 2088 | err = btrfs_add_link(trans, dentry, inode, 0); |
39279cc3 CM |
2089 | if (err) |
2090 | goto out_fail; | |
5f39d397 | 2091 | |
39279cc3 CM |
2092 | d_instantiate(dentry, inode); |
2093 | drop_on_err = 0; | |
2094 | dir->i_sb->s_dirt = 1; | |
2095 | btrfs_update_inode_block_group(trans, inode); | |
2096 | btrfs_update_inode_block_group(trans, dir); | |
2097 | ||
2098 | out_fail: | |
d3c2fdcf | 2099 | nr = trans->blocks_used; |
39279cc3 | 2100 | btrfs_end_transaction(trans, root); |
5f39d397 | 2101 | |
39279cc3 CM |
2102 | out_unlock: |
2103 | mutex_unlock(&root->fs_info->fs_mutex); | |
2104 | if (drop_on_err) | |
2105 | iput(inode); | |
d3c2fdcf | 2106 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2107 | btrfs_throttle(root); |
39279cc3 CM |
2108 | return err; |
2109 | } | |
2110 | ||
3b951516 CM |
2111 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
2112 | struct extent_map *existing, | |
2113 | struct extent_map *em) | |
2114 | { | |
2115 | u64 start_diff; | |
2116 | u64 new_end; | |
2117 | int ret = 0; | |
2118 | int real_blocks = existing->block_start < EXTENT_MAP_LAST_BYTE; | |
2119 | ||
2120 | if (real_blocks && em->block_start >= EXTENT_MAP_LAST_BYTE) | |
2121 | goto invalid; | |
2122 | ||
2123 | if (!real_blocks && em->block_start != existing->block_start) | |
2124 | goto invalid; | |
2125 | ||
2126 | new_end = max(existing->start + existing->len, em->start + em->len); | |
2127 | ||
2128 | if (existing->start >= em->start) { | |
2129 | if (em->start + em->len < existing->start) | |
2130 | goto invalid; | |
2131 | ||
2132 | start_diff = existing->start - em->start; | |
2133 | if (real_blocks && em->block_start + start_diff != | |
2134 | existing->block_start) | |
2135 | goto invalid; | |
2136 | ||
2137 | em->len = new_end - em->start; | |
2138 | ||
2139 | remove_extent_mapping(em_tree, existing); | |
2140 | /* free for the tree */ | |
2141 | free_extent_map(existing); | |
2142 | ret = add_extent_mapping(em_tree, em); | |
2143 | ||
2144 | } else if (em->start > existing->start) { | |
2145 | ||
2146 | if (existing->start + existing->len < em->start) | |
2147 | goto invalid; | |
2148 | ||
2149 | start_diff = em->start - existing->start; | |
2150 | if (real_blocks && existing->block_start + start_diff != | |
2151 | em->block_start) | |
2152 | goto invalid; | |
2153 | ||
2154 | remove_extent_mapping(em_tree, existing); | |
2155 | em->block_start = existing->block_start; | |
2156 | em->start = existing->start; | |
2157 | em->len = new_end - existing->start; | |
2158 | free_extent_map(existing); | |
2159 | ||
2160 | ret = add_extent_mapping(em_tree, em); | |
2161 | } else { | |
2162 | goto invalid; | |
2163 | } | |
2164 | return ret; | |
2165 | ||
2166 | invalid: | |
2167 | printk("invalid extent map merge [%Lu %Lu %Lu] [%Lu %Lu %Lu]\n", | |
2168 | existing->start, existing->len, existing->block_start, | |
2169 | em->start, em->len, em->block_start); | |
2170 | return -EIO; | |
2171 | } | |
2172 | ||
a52d9a80 | 2173 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 2174 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
2175 | int create) |
2176 | { | |
2177 | int ret; | |
2178 | int err = 0; | |
db94535d | 2179 | u64 bytenr; |
a52d9a80 CM |
2180 | u64 extent_start = 0; |
2181 | u64 extent_end = 0; | |
2182 | u64 objectid = inode->i_ino; | |
2183 | u32 found_type; | |
a52d9a80 CM |
2184 | struct btrfs_path *path; |
2185 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2186 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
2187 | struct extent_buffer *leaf; |
2188 | struct btrfs_key found_key; | |
a52d9a80 CM |
2189 | struct extent_map *em = NULL; |
2190 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 2191 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
2192 | struct btrfs_trans_handle *trans = NULL; |
2193 | ||
2194 | path = btrfs_alloc_path(); | |
2195 | BUG_ON(!path); | |
2196 | mutex_lock(&root->fs_info->fs_mutex); | |
2197 | ||
2198 | again: | |
d1310b2e CM |
2199 | spin_lock(&em_tree->lock); |
2200 | em = lookup_extent_mapping(em_tree, start, len); | |
a061fc8d CM |
2201 | if (em) |
2202 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
d1310b2e CM |
2203 | spin_unlock(&em_tree->lock); |
2204 | ||
a52d9a80 | 2205 | if (em) { |
e1c4b745 CM |
2206 | if (em->start > start || em->start + em->len <= start) |
2207 | free_extent_map(em); | |
2208 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
2209 | free_extent_map(em); |
2210 | else | |
2211 | goto out; | |
a52d9a80 | 2212 | } |
d1310b2e | 2213 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 2214 | if (!em) { |
d1310b2e CM |
2215 | err = -ENOMEM; |
2216 | goto out; | |
a52d9a80 | 2217 | } |
d1310b2e CM |
2218 | |
2219 | em->start = EXTENT_MAP_HOLE; | |
2220 | em->len = (u64)-1; | |
a061fc8d | 2221 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
179e29e4 CM |
2222 | ret = btrfs_lookup_file_extent(trans, root, path, |
2223 | objectid, start, trans != NULL); | |
a52d9a80 CM |
2224 | if (ret < 0) { |
2225 | err = ret; | |
2226 | goto out; | |
2227 | } | |
2228 | ||
2229 | if (ret != 0) { | |
2230 | if (path->slots[0] == 0) | |
2231 | goto not_found; | |
2232 | path->slots[0]--; | |
2233 | } | |
2234 | ||
5f39d397 CM |
2235 | leaf = path->nodes[0]; |
2236 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 2237 | struct btrfs_file_extent_item); |
a52d9a80 | 2238 | /* are we inside the extent that was found? */ |
5f39d397 CM |
2239 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2240 | found_type = btrfs_key_type(&found_key); | |
2241 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
2242 | found_type != BTRFS_EXTENT_DATA_KEY) { |
2243 | goto not_found; | |
2244 | } | |
2245 | ||
5f39d397 CM |
2246 | found_type = btrfs_file_extent_type(leaf, item); |
2247 | extent_start = found_key.offset; | |
a52d9a80 CM |
2248 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
2249 | extent_end = extent_start + | |
db94535d | 2250 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 2251 | err = 0; |
b888db2b | 2252 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2253 | em->start = start; |
2254 | if (start < extent_start) { | |
d1310b2e | 2255 | if (start + len <= extent_start) |
b888db2b | 2256 | goto not_found; |
d1310b2e | 2257 | em->len = extent_end - extent_start; |
a52d9a80 | 2258 | } else { |
d1310b2e | 2259 | em->len = len; |
a52d9a80 CM |
2260 | } |
2261 | goto not_found_em; | |
2262 | } | |
db94535d CM |
2263 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2264 | if (bytenr == 0) { | |
a52d9a80 | 2265 | em->start = extent_start; |
d1310b2e | 2266 | em->len = extent_end - extent_start; |
5f39d397 | 2267 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2268 | goto insert; |
2269 | } | |
db94535d CM |
2270 | bytenr += btrfs_file_extent_offset(leaf, item); |
2271 | em->block_start = bytenr; | |
a52d9a80 | 2272 | em->start = extent_start; |
d1310b2e | 2273 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2274 | goto insert; |
2275 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2276 | u64 page_start; |
5f39d397 | 2277 | unsigned long ptr; |
a52d9a80 | 2278 | char *map; |
3326d1b0 CM |
2279 | size_t size; |
2280 | size_t extent_offset; | |
2281 | size_t copy_size; | |
a52d9a80 | 2282 | |
5f39d397 CM |
2283 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2284 | path->slots[0])); | |
d1310b2e CM |
2285 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2286 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2287 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2288 | em->start = start; |
2289 | if (start < extent_start) { | |
d1310b2e | 2290 | if (start + len <= extent_start) |
b888db2b | 2291 | goto not_found; |
d1310b2e | 2292 | em->len = extent_end - extent_start; |
a52d9a80 | 2293 | } else { |
d1310b2e | 2294 | em->len = len; |
a52d9a80 CM |
2295 | } |
2296 | goto not_found_em; | |
2297 | } | |
689f9346 | 2298 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2299 | |
2300 | if (!page) { | |
2301 | em->start = extent_start; | |
d1310b2e | 2302 | em->len = size; |
689f9346 Y |
2303 | goto out; |
2304 | } | |
5f39d397 | 2305 | |
70dec807 CM |
2306 | page_start = page_offset(page) + pg_offset; |
2307 | extent_offset = page_start - extent_start; | |
2308 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2309 | size - extent_offset); |
3326d1b0 | 2310 | em->start = extent_start + extent_offset; |
70dec807 CM |
2311 | em->len = (copy_size + root->sectorsize - 1) & |
2312 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2313 | map = kmap(page); |
2314 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2315 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2316 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2317 | copy_size); |
2318 | flush_dcache_page(page); | |
2319 | } else if (create && PageUptodate(page)) { | |
2320 | if (!trans) { | |
2321 | kunmap(page); | |
2322 | free_extent_map(em); | |
2323 | em = NULL; | |
2324 | btrfs_release_path(root, path); | |
2325 | trans = btrfs_start_transaction(root, 1); | |
2326 | goto again; | |
2327 | } | |
70dec807 | 2328 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2329 | copy_size); |
2330 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2331 | } |
a52d9a80 | 2332 | kunmap(page); |
d1310b2e CM |
2333 | set_extent_uptodate(io_tree, em->start, |
2334 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2335 | goto insert; |
2336 | } else { | |
2337 | printk("unkknown found_type %d\n", found_type); | |
2338 | WARN_ON(1); | |
2339 | } | |
2340 | not_found: | |
2341 | em->start = start; | |
d1310b2e | 2342 | em->len = len; |
a52d9a80 | 2343 | not_found_em: |
5f39d397 | 2344 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2345 | insert: |
2346 | btrfs_release_path(root, path); | |
d1310b2e CM |
2347 | if (em->start > start || extent_map_end(em) <= start) { |
2348 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2349 | err = -EIO; |
2350 | goto out; | |
2351 | } | |
d1310b2e CM |
2352 | |
2353 | err = 0; | |
2354 | spin_lock(&em_tree->lock); | |
a52d9a80 | 2355 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
2356 | /* it is possible that someone inserted the extent into the tree |
2357 | * while we had the lock dropped. It is also possible that | |
2358 | * an overlapping map exists in the tree | |
2359 | */ | |
a52d9a80 | 2360 | if (ret == -EEXIST) { |
3b951516 CM |
2361 | struct extent_map *existing; |
2362 | existing = lookup_extent_mapping(em_tree, start, len); | |
e1c4b745 CM |
2363 | if (existing && (existing->start > start || |
2364 | existing->start + existing->len <= start)) { | |
2365 | free_extent_map(existing); | |
2366 | existing = NULL; | |
2367 | } | |
3b951516 CM |
2368 | if (!existing) { |
2369 | existing = lookup_extent_mapping(em_tree, em->start, | |
2370 | em->len); | |
2371 | if (existing) { | |
2372 | err = merge_extent_mapping(em_tree, existing, | |
2373 | em); | |
2374 | free_extent_map(existing); | |
2375 | if (err) { | |
2376 | free_extent_map(em); | |
2377 | em = NULL; | |
2378 | } | |
2379 | } else { | |
2380 | err = -EIO; | |
2381 | printk("failing to insert %Lu %Lu\n", | |
2382 | start, len); | |
2383 | free_extent_map(em); | |
2384 | em = NULL; | |
2385 | } | |
2386 | } else { | |
2387 | free_extent_map(em); | |
2388 | em = existing; | |
a52d9a80 | 2389 | } |
a52d9a80 | 2390 | } |
d1310b2e | 2391 | spin_unlock(&em_tree->lock); |
a52d9a80 CM |
2392 | out: |
2393 | btrfs_free_path(path); | |
2394 | if (trans) { | |
2395 | ret = btrfs_end_transaction(trans, root); | |
2396 | if (!err) | |
2397 | err = ret; | |
2398 | } | |
2399 | mutex_unlock(&root->fs_info->fs_mutex); | |
2400 | if (err) { | |
2401 | free_extent_map(em); | |
2402 | WARN_ON(1); | |
2403 | return ERR_PTR(err); | |
2404 | } | |
2405 | return em; | |
2406 | } | |
2407 | ||
e1c4b745 | 2408 | #if 0 /* waiting for O_DIRECT reads */ |
16432985 CM |
2409 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
2410 | struct buffer_head *bh_result, int create) | |
2411 | { | |
2412 | struct extent_map *em; | |
2413 | u64 start = (u64)iblock << inode->i_blkbits; | |
2414 | struct btrfs_multi_bio *multi = NULL; | |
2415 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2416 | u64 len; | |
2417 | u64 logical; | |
2418 | u64 map_length; | |
2419 | int ret = 0; | |
2420 | ||
2421 | em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0); | |
2422 | ||
2423 | if (!em || IS_ERR(em)) | |
2424 | goto out; | |
2425 | ||
e1c4b745 | 2426 | if (em->start > start || em->start + em->len <= start) { |
16432985 | 2427 | goto out; |
e1c4b745 | 2428 | } |
16432985 CM |
2429 | |
2430 | if (em->block_start == EXTENT_MAP_INLINE) { | |
2431 | ret = -EINVAL; | |
2432 | goto out; | |
2433 | } | |
2434 | ||
e1c4b745 CM |
2435 | len = em->start + em->len - start; |
2436 | len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size))); | |
2437 | ||
16432985 CM |
2438 | if (em->block_start == EXTENT_MAP_HOLE || |
2439 | em->block_start == EXTENT_MAP_DELALLOC) { | |
e1c4b745 | 2440 | bh_result->b_size = len; |
16432985 CM |
2441 | goto out; |
2442 | } | |
2443 | ||
16432985 CM |
2444 | logical = start - em->start; |
2445 | logical = em->block_start + logical; | |
2446 | ||
2447 | map_length = len; | |
2448 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
2449 | logical, &map_length, &multi, 0); | |
2450 | BUG_ON(ret); | |
2451 | bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits; | |
2452 | bh_result->b_size = min(map_length, len); | |
e1c4b745 | 2453 | |
16432985 CM |
2454 | bh_result->b_bdev = multi->stripes[0].dev->bdev; |
2455 | set_buffer_mapped(bh_result); | |
2456 | kfree(multi); | |
2457 | out: | |
2458 | free_extent_map(em); | |
2459 | return ret; | |
2460 | } | |
e1c4b745 | 2461 | #endif |
16432985 CM |
2462 | |
2463 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, | |
2464 | const struct iovec *iov, loff_t offset, | |
2465 | unsigned long nr_segs) | |
2466 | { | |
e1c4b745 CM |
2467 | return -EINVAL; |
2468 | #if 0 | |
16432985 CM |
2469 | struct file *file = iocb->ki_filp; |
2470 | struct inode *inode = file->f_mapping->host; | |
2471 | ||
2472 | if (rw == WRITE) | |
2473 | return -EINVAL; | |
2474 | ||
2475 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
2476 | offset, nr_segs, btrfs_get_block, NULL); | |
e1c4b745 | 2477 | #endif |
16432985 CM |
2478 | } |
2479 | ||
d396c6f5 | 2480 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2481 | { |
d396c6f5 | 2482 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2483 | } |
2484 | ||
a52d9a80 | 2485 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2486 | { |
d1310b2e CM |
2487 | struct extent_io_tree *tree; |
2488 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2489 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2490 | } |
1832a6d5 | 2491 | |
a52d9a80 | 2492 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2493 | { |
d1310b2e | 2494 | struct extent_io_tree *tree; |
b888db2b CM |
2495 | |
2496 | ||
2497 | if (current->flags & PF_MEMALLOC) { | |
2498 | redirty_page_for_writepage(wbc, page); | |
2499 | unlock_page(page); | |
2500 | return 0; | |
2501 | } | |
d1310b2e | 2502 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2503 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2504 | } |
2505 | ||
b293f02e CM |
2506 | static int btrfs_writepages(struct address_space *mapping, |
2507 | struct writeback_control *wbc) | |
2508 | { | |
d1310b2e CM |
2509 | struct extent_io_tree *tree; |
2510 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2511 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2512 | } | |
2513 | ||
3ab2fb5a CM |
2514 | static int |
2515 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2516 | struct list_head *pages, unsigned nr_pages) | |
2517 | { | |
d1310b2e CM |
2518 | struct extent_io_tree *tree; |
2519 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2520 | return extent_readpages(tree, mapping, pages, nr_pages, |
2521 | btrfs_get_extent); | |
2522 | } | |
2523 | ||
70dec807 | 2524 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2525 | { |
d1310b2e CM |
2526 | struct extent_io_tree *tree; |
2527 | struct extent_map_tree *map; | |
a52d9a80 | 2528 | int ret; |
8c2383c3 | 2529 | |
d1310b2e CM |
2530 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2531 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2532 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 | 2533 | if (ret == 1) { |
4ef64eae | 2534 | invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); |
a52d9a80 CM |
2535 | ClearPagePrivate(page); |
2536 | set_page_private(page, 0); | |
2537 | page_cache_release(page); | |
39279cc3 | 2538 | } |
a52d9a80 | 2539 | return ret; |
39279cc3 CM |
2540 | } |
2541 | ||
a52d9a80 | 2542 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2543 | { |
d1310b2e | 2544 | struct extent_io_tree *tree; |
39279cc3 | 2545 | |
d1310b2e | 2546 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 CM |
2547 | extent_invalidatepage(tree, page, offset); |
2548 | btrfs_releasepage(page, GFP_NOFS); | |
9ad6b7bc | 2549 | if (PagePrivate(page)) { |
4ef64eae | 2550 | invalidate_extent_lru(tree, page_offset(page), PAGE_CACHE_SIZE); |
9ad6b7bc CM |
2551 | ClearPagePrivate(page); |
2552 | set_page_private(page, 0); | |
2553 | page_cache_release(page); | |
2554 | } | |
39279cc3 CM |
2555 | } |
2556 | ||
9ebefb18 CM |
2557 | /* |
2558 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
2559 | * called from a page fault handler when a page is first dirtied. Hence we must | |
2560 | * be careful to check for EOF conditions here. We set the page up correctly | |
2561 | * for a written page which means we get ENOSPC checking when writing into | |
2562 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
2563 | * support these features. | |
2564 | * | |
2565 | * We are not allowed to take the i_mutex here so we have to play games to | |
2566 | * protect against truncate races as the page could now be beyond EOF. Because | |
2567 | * vmtruncate() writes the inode size before removing pages, once we have the | |
2568 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
2569 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
2570 | * unlock the page. | |
2571 | */ | |
2572 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
2573 | { | |
6da6abae | 2574 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 2575 | struct btrfs_root *root = BTRFS_I(inode)->root; |
9ebefb18 CM |
2576 | unsigned long end; |
2577 | loff_t size; | |
1832a6d5 | 2578 | int ret; |
a52d9a80 | 2579 | u64 page_start; |
9ebefb18 | 2580 | |
1832a6d5 CM |
2581 | mutex_lock(&root->fs_info->fs_mutex); |
2582 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); | |
8f662a76 | 2583 | mutex_unlock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
2584 | if (ret) |
2585 | goto out; | |
2586 | ||
2587 | ret = -EINVAL; | |
2588 | ||
9ebefb18 CM |
2589 | lock_page(page); |
2590 | wait_on_page_writeback(page); | |
9ebefb18 | 2591 | size = i_size_read(inode); |
35ebb934 | 2592 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
a52d9a80 | 2593 | |
9ebefb18 | 2594 | if ((page->mapping != inode->i_mapping) || |
a52d9a80 | 2595 | (page_start > size)) { |
9ebefb18 CM |
2596 | /* page got truncated out from underneath us */ |
2597 | goto out_unlock; | |
2598 | } | |
2599 | ||
2600 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 2601 | if (page_start + PAGE_CACHE_SIZE > size) |
9ebefb18 CM |
2602 | end = size & ~PAGE_CACHE_MASK; |
2603 | else | |
2604 | end = PAGE_CACHE_SIZE; | |
2605 | ||
b888db2b | 2606 | ret = btrfs_cow_one_page(inode, page, end); |
9ebefb18 CM |
2607 | |
2608 | out_unlock: | |
2609 | unlock_page(page); | |
1832a6d5 | 2610 | out: |
9ebefb18 CM |
2611 | return ret; |
2612 | } | |
2613 | ||
39279cc3 CM |
2614 | static void btrfs_truncate(struct inode *inode) |
2615 | { | |
2616 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2617 | int ret; | |
2618 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 2619 | unsigned long nr; |
39279cc3 CM |
2620 | |
2621 | if (!S_ISREG(inode->i_mode)) | |
2622 | return; | |
2623 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
2624 | return; | |
2625 | ||
2626 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
2627 | ||
2628 | mutex_lock(&root->fs_info->fs_mutex); | |
2629 | trans = btrfs_start_transaction(root, 1); | |
2630 | btrfs_set_trans_block_group(trans, inode); | |
2631 | ||
2632 | /* FIXME, add redo link to tree so we don't leak on crash */ | |
85e21bac CM |
2633 | ret = btrfs_truncate_in_trans(trans, root, inode, |
2634 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 2635 | btrfs_update_inode(trans, root, inode); |
d3c2fdcf | 2636 | nr = trans->blocks_used; |
5f39d397 | 2637 | |
39279cc3 CM |
2638 | ret = btrfs_end_transaction(trans, root); |
2639 | BUG_ON(ret); | |
2640 | mutex_unlock(&root->fs_info->fs_mutex); | |
d3c2fdcf | 2641 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2642 | btrfs_throttle(root); |
39279cc3 CM |
2643 | } |
2644 | ||
3b96362c SW |
2645 | /* |
2646 | * Invalidate a single dcache entry at the root of the filesystem. | |
2647 | * Needed after creation of snapshot or subvolume. | |
2648 | */ | |
2649 | void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name, | |
2650 | int namelen) | |
2651 | { | |
2652 | struct dentry *alias, *entry; | |
2653 | struct qstr qstr; | |
2654 | ||
2655 | alias = d_find_alias(root->fs_info->sb->s_root->d_inode); | |
2656 | if (alias) { | |
2657 | qstr.name = name; | |
2658 | qstr.len = namelen; | |
2659 | /* change me if btrfs ever gets a d_hash operation */ | |
2660 | qstr.hash = full_name_hash(qstr.name, qstr.len); | |
2661 | entry = d_lookup(alias, &qstr); | |
2662 | dput(alias); | |
2663 | if (entry) { | |
2664 | d_invalidate(entry); | |
2665 | dput(entry); | |
2666 | } | |
2667 | } | |
2668 | } | |
2669 | ||
4313b399 CM |
2670 | static int noinline create_subvol(struct btrfs_root *root, char *name, |
2671 | int namelen) | |
39279cc3 CM |
2672 | { |
2673 | struct btrfs_trans_handle *trans; | |
2674 | struct btrfs_key key; | |
2675 | struct btrfs_root_item root_item; | |
2676 | struct btrfs_inode_item *inode_item; | |
5f39d397 | 2677 | struct extent_buffer *leaf; |
dc17ff8f | 2678 | struct btrfs_root *new_root = root; |
39279cc3 CM |
2679 | struct inode *inode; |
2680 | struct inode *dir; | |
2681 | int ret; | |
54aa1f4d | 2682 | int err; |
39279cc3 CM |
2683 | u64 objectid; |
2684 | u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID; | |
d3c2fdcf | 2685 | unsigned long nr = 1; |
39279cc3 CM |
2686 | |
2687 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2688 | ret = btrfs_check_free_space(root, 1, 0); |
2689 | if (ret) | |
2690 | goto fail_commit; | |
2691 | ||
39279cc3 CM |
2692 | trans = btrfs_start_transaction(root, 1); |
2693 | BUG_ON(!trans); | |
2694 | ||
7bb86316 CM |
2695 | ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root, |
2696 | 0, &objectid); | |
2697 | if (ret) | |
2698 | goto fail; | |
2699 | ||
2700 | leaf = __btrfs_alloc_free_block(trans, root, root->leafsize, | |
2701 | objectid, trans->transid, 0, 0, | |
2702 | 0, 0); | |
5f39d397 CM |
2703 | if (IS_ERR(leaf)) |
2704 | return PTR_ERR(leaf); | |
2705 | ||
2706 | btrfs_set_header_nritems(leaf, 0); | |
2707 | btrfs_set_header_level(leaf, 0); | |
db94535d | 2708 | btrfs_set_header_bytenr(leaf, leaf->start); |
5f39d397 | 2709 | btrfs_set_header_generation(leaf, trans->transid); |
7bb86316 CM |
2710 | btrfs_set_header_owner(leaf, objectid); |
2711 | ||
5f39d397 CM |
2712 | write_extent_buffer(leaf, root->fs_info->fsid, |
2713 | (unsigned long)btrfs_header_fsid(leaf), | |
2714 | BTRFS_FSID_SIZE); | |
2715 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 CM |
2716 | |
2717 | inode_item = &root_item.inode; | |
2718 | memset(inode_item, 0, sizeof(*inode_item)); | |
5f39d397 CM |
2719 | inode_item->generation = cpu_to_le64(1); |
2720 | inode_item->size = cpu_to_le64(3); | |
2721 | inode_item->nlink = cpu_to_le32(1); | |
2722 | inode_item->nblocks = cpu_to_le64(1); | |
2723 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
39279cc3 | 2724 | |
db94535d CM |
2725 | btrfs_set_root_bytenr(&root_item, leaf->start); |
2726 | btrfs_set_root_level(&root_item, 0); | |
39279cc3 | 2727 | btrfs_set_root_refs(&root_item, 1); |
5f39d397 CM |
2728 | btrfs_set_root_used(&root_item, 0); |
2729 | ||
5eda7b5e CM |
2730 | memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress)); |
2731 | root_item.drop_level = 0; | |
5f39d397 CM |
2732 | |
2733 | free_extent_buffer(leaf); | |
2734 | leaf = NULL; | |
39279cc3 | 2735 | |
39279cc3 CM |
2736 | btrfs_set_root_dirid(&root_item, new_dirid); |
2737 | ||
2738 | key.objectid = objectid; | |
2739 | key.offset = 1; | |
39279cc3 CM |
2740 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); |
2741 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
2742 | &root_item); | |
54aa1f4d CM |
2743 | if (ret) |
2744 | goto fail; | |
39279cc3 CM |
2745 | |
2746 | /* | |
2747 | * insert the directory item | |
2748 | */ | |
2749 | key.offset = (u64)-1; | |
2750 | dir = root->fs_info->sb->s_root->d_inode; | |
2751 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
2752 | name, namelen, dir->i_ino, &key, | |
2753 | BTRFS_FT_DIR); | |
54aa1f4d CM |
2754 | if (ret) |
2755 | goto fail; | |
39279cc3 | 2756 | |
3954401f CM |
2757 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, |
2758 | name, namelen, objectid, | |
2759 | root->fs_info->sb->s_root->d_inode->i_ino); | |
2760 | if (ret) | |
2761 | goto fail; | |
2762 | ||
39279cc3 | 2763 | ret = btrfs_commit_transaction(trans, root); |
54aa1f4d CM |
2764 | if (ret) |
2765 | goto fail_commit; | |
39279cc3 | 2766 | |
58176a96 | 2767 | new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen); |
39279cc3 CM |
2768 | BUG_ON(!new_root); |
2769 | ||
2770 | trans = btrfs_start_transaction(new_root, 1); | |
2771 | BUG_ON(!trans); | |
2772 | ||
9c58309d CM |
2773 | inode = btrfs_new_inode(trans, new_root, "..", 2, new_dirid, |
2774 | new_dirid, | |
39279cc3 | 2775 | BTRFS_I(dir)->block_group, S_IFDIR | 0700); |
54aa1f4d CM |
2776 | if (IS_ERR(inode)) |
2777 | goto fail; | |
39279cc3 CM |
2778 | inode->i_op = &btrfs_dir_inode_operations; |
2779 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 2780 | new_root->inode = inode; |
39279cc3 | 2781 | |
3954401f CM |
2782 | ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid, |
2783 | new_dirid); | |
39279cc3 | 2784 | inode->i_nlink = 1; |
3954401f | 2785 | inode->i_size = 0; |
39279cc3 | 2786 | ret = btrfs_update_inode(trans, new_root, inode); |
54aa1f4d CM |
2787 | if (ret) |
2788 | goto fail; | |
3b96362c SW |
2789 | |
2790 | /* Invalidate existing dcache entry for new subvolume. */ | |
2791 | btrfs_invalidate_dcache_root(root, name, namelen); | |
2792 | ||
54aa1f4d | 2793 | fail: |
d3c2fdcf | 2794 | nr = trans->blocks_used; |
dc17ff8f | 2795 | err = btrfs_commit_transaction(trans, new_root); |
54aa1f4d CM |
2796 | if (err && !ret) |
2797 | ret = err; | |
2798 | fail_commit: | |
39279cc3 | 2799 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2800 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2801 | btrfs_throttle(root); |
54aa1f4d | 2802 | return ret; |
39279cc3 CM |
2803 | } |
2804 | ||
2805 | static int create_snapshot(struct btrfs_root *root, char *name, int namelen) | |
2806 | { | |
3063d29f | 2807 | struct btrfs_pending_snapshot *pending_snapshot; |
39279cc3 | 2808 | struct btrfs_trans_handle *trans; |
39279cc3 | 2809 | int ret; |
54aa1f4d | 2810 | int err; |
1832a6d5 | 2811 | unsigned long nr = 0; |
39279cc3 CM |
2812 | |
2813 | if (!root->ref_cows) | |
2814 | return -EINVAL; | |
2815 | ||
2816 | mutex_lock(&root->fs_info->fs_mutex); | |
1832a6d5 CM |
2817 | ret = btrfs_check_free_space(root, 1, 0); |
2818 | if (ret) | |
2819 | goto fail_unlock; | |
2820 | ||
3063d29f CM |
2821 | pending_snapshot = kmalloc(sizeof(*pending_snapshot), GFP_NOFS); |
2822 | if (!pending_snapshot) { | |
2823 | ret = -ENOMEM; | |
2824 | goto fail_unlock; | |
2825 | } | |
fb4bc1e0 | 2826 | pending_snapshot->name = kmalloc(namelen + 1, GFP_NOFS); |
3063d29f CM |
2827 | if (!pending_snapshot->name) { |
2828 | ret = -ENOMEM; | |
2829 | kfree(pending_snapshot); | |
2830 | goto fail_unlock; | |
2831 | } | |
fb4bc1e0 Y |
2832 | memcpy(pending_snapshot->name, name, namelen); |
2833 | pending_snapshot->name[namelen] = '\0'; | |
39279cc3 CM |
2834 | trans = btrfs_start_transaction(root, 1); |
2835 | BUG_ON(!trans); | |
3063d29f CM |
2836 | pending_snapshot->root = root; |
2837 | list_add(&pending_snapshot->list, | |
2838 | &trans->transaction->pending_snapshots); | |
39279cc3 | 2839 | ret = btrfs_update_inode(trans, root, root->inode); |
54aa1f4d | 2840 | err = btrfs_commit_transaction(trans, root); |
5f39d397 | 2841 | |
1832a6d5 | 2842 | fail_unlock: |
39279cc3 | 2843 | mutex_unlock(&root->fs_info->fs_mutex); |
d3c2fdcf | 2844 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 2845 | btrfs_throttle(root); |
54aa1f4d | 2846 | return ret; |
39279cc3 CM |
2847 | } |
2848 | ||
edbd8d4e | 2849 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
2850 | struct file_ra_state *ra, struct file *file, |
2851 | pgoff_t offset, pgoff_t last_index) | |
2852 | { | |
8e7bf94f | 2853 | pgoff_t req_size = last_index - offset + 1; |
86479a04 CM |
2854 | |
2855 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
86479a04 CM |
2856 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); |
2857 | return offset; | |
2858 | #else | |
86479a04 CM |
2859 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); |
2860 | return offset + req_size; | |
2861 | #endif | |
2862 | } | |
2863 | ||
2864 | int btrfs_defrag_file(struct file *file) { | |
6da6abae | 2865 | struct inode *inode = fdentry(file)->d_inode; |
1832a6d5 | 2866 | struct btrfs_root *root = BTRFS_I(inode)->root; |
d1310b2e | 2867 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
86479a04 CM |
2868 | struct page *page; |
2869 | unsigned long last_index; | |
8e7bf94f CM |
2870 | unsigned long ra_pages = root->fs_info->bdi.ra_pages; |
2871 | unsigned long total_read = 0; | |
86479a04 CM |
2872 | u64 page_start; |
2873 | u64 page_end; | |
2874 | unsigned long i; | |
1832a6d5 CM |
2875 | int ret; |
2876 | ||
2877 | mutex_lock(&root->fs_info->fs_mutex); | |
2878 | ret = btrfs_check_free_space(root, inode->i_size, 0); | |
2879 | mutex_unlock(&root->fs_info->fs_mutex); | |
2880 | if (ret) | |
2881 | return -ENOSPC; | |
86479a04 CM |
2882 | |
2883 | mutex_lock(&inode->i_mutex); | |
2884 | last_index = inode->i_size >> PAGE_CACHE_SHIFT; | |
2885 | for (i = 0; i <= last_index; i++) { | |
8e7bf94f CM |
2886 | if (total_read % ra_pages == 0) { |
2887 | btrfs_force_ra(inode->i_mapping, &file->f_ra, file, i, | |
2888 | min(last_index, i + ra_pages - 1)); | |
86479a04 | 2889 | } |
8e7bf94f | 2890 | total_read++; |
86479a04 CM |
2891 | page = grab_cache_page(inode->i_mapping, i); |
2892 | if (!page) | |
2893 | goto out_unlock; | |
2894 | if (!PageUptodate(page)) { | |
2895 | btrfs_readpage(NULL, page); | |
2896 | lock_page(page); | |
2897 | if (!PageUptodate(page)) { | |
2898 | unlock_page(page); | |
2899 | page_cache_release(page); | |
2900 | goto out_unlock; | |
2901 | } | |
2902 | } | |
ec44a35c CM |
2903 | |
2904 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) | |
2905 | ClearPageDirty(page); | |
2906 | #else | |
2907 | cancel_dirty_page(page, PAGE_CACHE_SIZE); | |
2908 | #endif | |
2909 | wait_on_page_writeback(page); | |
2910 | set_page_extent_mapped(page); | |
2911 | ||
35ebb934 | 2912 | page_start = (u64)page->index << PAGE_CACHE_SHIFT; |
86479a04 CM |
2913 | page_end = page_start + PAGE_CACHE_SIZE - 1; |
2914 | ||
d1310b2e | 2915 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); |
d1310b2e | 2916 | set_extent_delalloc(io_tree, page_start, |
86479a04 | 2917 | page_end, GFP_NOFS); |
edbd8d4e | 2918 | |
d1310b2e | 2919 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); |
86479a04 CM |
2920 | set_page_dirty(page); |
2921 | unlock_page(page); | |
2922 | page_cache_release(page); | |
2923 | balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1); | |
2924 | } | |
2925 | ||
2926 | out_unlock: | |
2927 | mutex_unlock(&inode->i_mutex); | |
2928 | return 0; | |
2929 | } | |
2930 | ||
edbd8d4e CM |
2931 | static int btrfs_ioctl_resize(struct btrfs_root *root, void __user *arg) |
2932 | { | |
2933 | u64 new_size; | |
2934 | u64 old_size; | |
8f18cf13 | 2935 | u64 devid = 1; |
edbd8d4e CM |
2936 | struct btrfs_ioctl_vol_args *vol_args; |
2937 | struct btrfs_trans_handle *trans; | |
8f18cf13 | 2938 | struct btrfs_device *device = NULL; |
edbd8d4e | 2939 | char *sizestr; |
8f18cf13 | 2940 | char *devstr = NULL; |
edbd8d4e CM |
2941 | int ret = 0; |
2942 | int namelen; | |
2943 | int mod = 0; | |
2944 | ||
2945 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
2946 | ||
2947 | if (!vol_args) | |
2948 | return -ENOMEM; | |
2949 | ||
2950 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
2951 | ret = -EFAULT; | |
2952 | goto out; | |
2953 | } | |
2954 | namelen = strlen(vol_args->name); | |
2955 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
2956 | ret = -EINVAL; | |
2957 | goto out; | |
2958 | } | |
2959 | ||
8f18cf13 | 2960 | mutex_lock(&root->fs_info->fs_mutex); |
edbd8d4e | 2961 | sizestr = vol_args->name; |
8f18cf13 CM |
2962 | devstr = strchr(sizestr, ':'); |
2963 | if (devstr) { | |
2964 | char *end; | |
2965 | sizestr = devstr + 1; | |
2966 | *devstr = '\0'; | |
2967 | devstr = vol_args->name; | |
2968 | devid = simple_strtoull(devstr, &end, 10); | |
2969 | printk("resizing devid %Lu\n", devid); | |
2970 | } | |
2971 | device = btrfs_find_device(root, devid, NULL); | |
2972 | if (!device) { | |
2973 | printk("resizer unable to find device %Lu\n", devid); | |
2974 | ret = -EINVAL; | |
2975 | goto out_unlock; | |
2976 | } | |
edbd8d4e | 2977 | if (!strcmp(sizestr, "max")) |
8f18cf13 | 2978 | new_size = device->bdev->bd_inode->i_size; |
edbd8d4e CM |
2979 | else { |
2980 | if (sizestr[0] == '-') { | |
2981 | mod = -1; | |
2982 | sizestr++; | |
2983 | } else if (sizestr[0] == '+') { | |
2984 | mod = 1; | |
2985 | sizestr++; | |
2986 | } | |
2987 | new_size = btrfs_parse_size(sizestr); | |
2988 | if (new_size == 0) { | |
2989 | ret = -EINVAL; | |
8f18cf13 | 2990 | goto out_unlock; |
edbd8d4e CM |
2991 | } |
2992 | } | |
2993 | ||
8f18cf13 | 2994 | old_size = device->total_bytes; |
edbd8d4e CM |
2995 | |
2996 | if (mod < 0) { | |
2997 | if (new_size > old_size) { | |
2998 | ret = -EINVAL; | |
2999 | goto out_unlock; | |
3000 | } | |
3001 | new_size = old_size - new_size; | |
3002 | } else if (mod > 0) { | |
3003 | new_size = old_size + new_size; | |
3004 | } | |
3005 | ||
3006 | if (new_size < 256 * 1024 * 1024) { | |
3007 | ret = -EINVAL; | |
3008 | goto out_unlock; | |
3009 | } | |
8f18cf13 | 3010 | if (new_size > device->bdev->bd_inode->i_size) { |
edbd8d4e CM |
3011 | ret = -EFBIG; |
3012 | goto out_unlock; | |
3013 | } | |
f9ef6604 CM |
3014 | |
3015 | do_div(new_size, root->sectorsize); | |
3016 | new_size *= root->sectorsize; | |
edbd8d4e | 3017 | |
8f18cf13 CM |
3018 | printk("new size for %s is %llu\n", device->name, (unsigned long long)new_size); |
3019 | ||
edbd8d4e CM |
3020 | if (new_size > old_size) { |
3021 | trans = btrfs_start_transaction(root, 1); | |
8f18cf13 | 3022 | ret = btrfs_grow_device(trans, device, new_size); |
edbd8d4e CM |
3023 | btrfs_commit_transaction(trans, root); |
3024 | } else { | |
8f18cf13 | 3025 | ret = btrfs_shrink_device(device, new_size); |
edbd8d4e CM |
3026 | } |
3027 | ||
3028 | out_unlock: | |
3029 | mutex_unlock(&root->fs_info->fs_mutex); | |
3030 | out: | |
3031 | kfree(vol_args); | |
3032 | return ret; | |
3033 | } | |
3034 | ||
4313b399 CM |
3035 | static int noinline btrfs_ioctl_snap_create(struct btrfs_root *root, |
3036 | void __user *arg) | |
39279cc3 | 3037 | { |
4aec2b52 | 3038 | struct btrfs_ioctl_vol_args *vol_args; |
39279cc3 | 3039 | struct btrfs_dir_item *di; |
39279cc3 CM |
3040 | struct btrfs_path *path; |
3041 | u64 root_dirid; | |
4aec2b52 CM |
3042 | int namelen; |
3043 | int ret; | |
39279cc3 | 3044 | |
4aec2b52 | 3045 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); |
5f39d397 | 3046 | |
4aec2b52 CM |
3047 | if (!vol_args) |
3048 | return -ENOMEM; | |
3049 | ||
3050 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
3051 | ret = -EFAULT; | |
3052 | goto out; | |
3053 | } | |
3054 | ||
3055 | namelen = strlen(vol_args->name); | |
3056 | if (namelen > BTRFS_VOL_NAME_MAX) { | |
3057 | ret = -EINVAL; | |
3058 | goto out; | |
3059 | } | |
3060 | if (strchr(vol_args->name, '/')) { | |
3061 | ret = -EINVAL; | |
3062 | goto out; | |
3063 | } | |
d03581f4 CH |
3064 | |
3065 | path = btrfs_alloc_path(); | |
4aec2b52 CM |
3066 | if (!path) { |
3067 | ret = -ENOMEM; | |
3068 | goto out; | |
3069 | } | |
d03581f4 CH |
3070 | |
3071 | root_dirid = root->fs_info->sb->s_root->d_inode->i_ino, | |
3072 | mutex_lock(&root->fs_info->fs_mutex); | |
3073 | di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root, | |
3074 | path, root_dirid, | |
4aec2b52 | 3075 | vol_args->name, namelen, 0); |
d03581f4 CH |
3076 | mutex_unlock(&root->fs_info->fs_mutex); |
3077 | btrfs_free_path(path); | |
4aec2b52 CM |
3078 | |
3079 | if (di && !IS_ERR(di)) { | |
3080 | ret = -EEXIST; | |
3081 | goto out; | |
3082 | } | |
3083 | ||
3084 | if (IS_ERR(di)) { | |
3085 | ret = PTR_ERR(di); | |
3086 | goto out; | |
3087 | } | |
d03581f4 CH |
3088 | |
3089 | if (root == root->fs_info->tree_root) | |
4aec2b52 CM |
3090 | ret = create_subvol(root, vol_args->name, namelen); |
3091 | else | |
3092 | ret = create_snapshot(root, vol_args->name, namelen); | |
3093 | out: | |
3094 | kfree(vol_args); | |
3095 | return ret; | |
d03581f4 CH |
3096 | } |
3097 | ||
3098 | static int btrfs_ioctl_defrag(struct file *file) | |
3099 | { | |
6da6abae | 3100 | struct inode *inode = fdentry(file)->d_inode; |
d03581f4 CH |
3101 | struct btrfs_root *root = BTRFS_I(inode)->root; |
3102 | ||
3103 | switch (inode->i_mode & S_IFMT) { | |
3104 | case S_IFDIR: | |
39279cc3 | 3105 | mutex_lock(&root->fs_info->fs_mutex); |
d03581f4 CH |
3106 | btrfs_defrag_root(root, 0); |
3107 | btrfs_defrag_root(root->fs_info->extent_root, 0); | |
39279cc3 | 3108 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 | 3109 | break; |
d03581f4 CH |
3110 | case S_IFREG: |
3111 | btrfs_defrag_file(file); | |
3112 | break; | |
3113 | } | |
3114 | ||
3115 | return 0; | |
3116 | } | |
6702ed49 | 3117 | |
788f20eb CM |
3118 | long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) |
3119 | { | |
3120 | struct btrfs_ioctl_vol_args *vol_args; | |
3121 | int ret; | |
3122 | ||
3123 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
3124 | ||
3125 | if (!vol_args) | |
3126 | return -ENOMEM; | |
3127 | ||
3128 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
3129 | ret = -EFAULT; | |
3130 | goto out; | |
3131 | } | |
3132 | ret = btrfs_init_new_device(root, vol_args->name); | |
3133 | ||
3134 | out: | |
3135 | kfree(vol_args); | |
3136 | return ret; | |
3137 | } | |
3138 | ||
a061fc8d CM |
3139 | long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) |
3140 | { | |
3141 | struct btrfs_ioctl_vol_args *vol_args; | |
3142 | int ret; | |
3143 | ||
3144 | vol_args = kmalloc(sizeof(*vol_args), GFP_NOFS); | |
3145 | ||
3146 | if (!vol_args) | |
3147 | return -ENOMEM; | |
3148 | ||
3149 | if (copy_from_user(vol_args, arg, sizeof(*vol_args))) { | |
3150 | ret = -EFAULT; | |
3151 | goto out; | |
3152 | } | |
3153 | ret = btrfs_rm_device(root, vol_args->name); | |
3154 | ||
3155 | out: | |
3156 | kfree(vol_args); | |
3157 | return ret; | |
3158 | } | |
3159 | ||
5d9cd9ec | 3160 | int dup_item_to_inode(struct btrfs_trans_handle *trans, |
f2eb0a24 SW |
3161 | struct btrfs_root *root, |
3162 | struct btrfs_path *path, | |
3163 | struct extent_buffer *leaf, | |
3164 | int slot, | |
3165 | struct btrfs_key *key, | |
3166 | u64 destino) | |
3167 | { | |
5d9cd9ec | 3168 | char *dup; |
f2eb0a24 | 3169 | int len = btrfs_item_size_nr(leaf, slot); |
f2eb0a24 | 3170 | struct btrfs_key ckey = *key; |
5d9cd9ec CM |
3171 | int ret = 0; |
3172 | ||
3173 | dup = kmalloc(len, GFP_NOFS); | |
3174 | if (!dup) | |
3175 | return -ENOMEM; | |
3176 | ||
3177 | read_extent_buffer(leaf, dup, btrfs_item_ptr_offset(leaf, slot), len); | |
3178 | btrfs_release_path(root, path); | |
f2eb0a24 SW |
3179 | |
3180 | ckey.objectid = destino; | |
5d9cd9ec CM |
3181 | ret = btrfs_insert_item(trans, root, &ckey, dup, len); |
3182 | kfree(dup); | |
3183 | return ret; | |
f2eb0a24 SW |
3184 | } |
3185 | ||
3186 | long btrfs_ioctl_clone(struct file *file, unsigned long src_fd) | |
3187 | { | |
3188 | struct inode *inode = fdentry(file)->d_inode; | |
3189 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3190 | struct file *src_file; | |
3191 | struct inode *src; | |
3192 | struct btrfs_trans_handle *trans; | |
3193 | int ret; | |
3194 | u64 pos; | |
3195 | struct btrfs_path *path; | |
3196 | struct btrfs_key key; | |
3197 | struct extent_buffer *leaf; | |
3198 | u32 nritems; | |
f2eb0a24 SW |
3199 | int slot; |
3200 | ||
3201 | src_file = fget(src_fd); | |
3202 | if (!src_file) | |
3203 | return -EBADF; | |
3204 | src = src_file->f_dentry->d_inode; | |
3205 | ||
3206 | ret = -EXDEV; | |
3207 | if (src->i_sb != inode->i_sb) | |
3208 | goto out_fput; | |
3209 | ||
3210 | if (inode < src) { | |
3211 | mutex_lock(&inode->i_mutex); | |
3212 | mutex_lock(&src->i_mutex); | |
3213 | } else { | |
3214 | mutex_lock(&src->i_mutex); | |
3215 | mutex_lock(&inode->i_mutex); | |
3216 | } | |
3217 | ||
3218 | ret = -ENOTEMPTY; | |
3219 | if (inode->i_size) | |
3220 | goto out_unlock; | |
3221 | ||
3222 | /* do any pending delalloc/csum calc on src, one way or | |
3223 | another, and lock file content */ | |
3224 | while (1) { | |
3225 | filemap_write_and_wait(src->i_mapping); | |
3226 | lock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); | |
3227 | if (BTRFS_I(src)->delalloc_bytes == 0) | |
3228 | break; | |
3229 | unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); | |
3230 | } | |
3231 | ||
3232 | mutex_lock(&root->fs_info->fs_mutex); | |
3233 | trans = btrfs_start_transaction(root, 0); | |
3234 | path = btrfs_alloc_path(); | |
5d9cd9ec CM |
3235 | if (!path) { |
3236 | ret = -ENOMEM; | |
3237 | goto out; | |
3238 | } | |
3239 | key.offset = 0; | |
3240 | key.type = BTRFS_EXTENT_DATA_KEY; | |
3241 | key.objectid = src->i_ino; | |
f2eb0a24 | 3242 | pos = 0; |
5d9cd9ec CM |
3243 | path->reada = 2; |
3244 | ||
f2eb0a24 | 3245 | while (1) { |
5d9cd9ec CM |
3246 | /* |
3247 | * note the key will change type as we walk through the | |
3248 | * tree. | |
3249 | */ | |
3250 | ret = btrfs_search_slot(trans, root, &key, path, 0, 0); | |
f2eb0a24 SW |
3251 | if (ret < 0) |
3252 | goto out; | |
5d9cd9ec CM |
3253 | |
3254 | if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { | |
3255 | ret = btrfs_next_leaf(root, path); | |
3256 | if (ret < 0) | |
f2eb0a24 | 3257 | goto out; |
5d9cd9ec CM |
3258 | if (ret > 0) |
3259 | break; | |
f2eb0a24 | 3260 | } |
f2eb0a24 SW |
3261 | leaf = path->nodes[0]; |
3262 | slot = path->slots[0]; | |
3263 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
3264 | nritems = btrfs_header_nritems(leaf); | |
3265 | ||
3266 | if (btrfs_key_type(&key) > BTRFS_CSUM_ITEM_KEY || | |
3267 | key.objectid != src->i_ino) | |
5d9cd9ec CM |
3268 | break; |
3269 | ||
f2eb0a24 SW |
3270 | if (btrfs_key_type(&key) == BTRFS_EXTENT_DATA_KEY) { |
3271 | struct btrfs_file_extent_item *extent; | |
3272 | int found_type; | |
3273 | pos = key.offset; | |
3274 | extent = btrfs_item_ptr(leaf, slot, | |
3275 | struct btrfs_file_extent_item); | |
3276 | found_type = btrfs_file_extent_type(leaf, extent); | |
3277 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
3278 | u64 len = btrfs_file_extent_num_bytes(leaf, | |
3279 | extent); | |
3280 | u64 ds = btrfs_file_extent_disk_bytenr(leaf, | |
3281 | extent); | |
3282 | u64 dl = btrfs_file_extent_disk_num_bytes(leaf, | |
3283 | extent); | |
3284 | u64 off = btrfs_file_extent_offset(leaf, | |
3285 | extent); | |
3286 | btrfs_insert_file_extent(trans, root, | |
3287 | inode->i_ino, pos, | |
3288 | ds, dl, len, off); | |
3289 | /* ds == 0 means there's a hole */ | |
3290 | if (ds != 0) { | |
3291 | btrfs_inc_extent_ref(trans, root, | |
3292 | ds, dl, | |
3293 | root->root_key.objectid, | |
3294 | trans->transid, | |
3295 | inode->i_ino, pos); | |
3296 | } | |
3297 | pos = key.offset + len; | |
3298 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
5d9cd9ec CM |
3299 | ret = dup_item_to_inode(trans, root, path, |
3300 | leaf, slot, &key, | |
3301 | inode->i_ino); | |
3302 | if (ret) | |
3303 | goto out; | |
f2eb0a24 SW |
3304 | pos = key.offset + btrfs_item_size_nr(leaf, |
3305 | slot); | |
3306 | } | |
5d9cd9ec CM |
3307 | } else if (btrfs_key_type(&key) == BTRFS_CSUM_ITEM_KEY) { |
3308 | ret = dup_item_to_inode(trans, root, path, leaf, | |
3309 | slot, &key, inode->i_ino); | |
f2eb0a24 | 3310 | |
5d9cd9ec | 3311 | if (ret) |
f2eb0a24 | 3312 | goto out; |
f2eb0a24 | 3313 | } |
5d9cd9ec CM |
3314 | key.offset++; |
3315 | btrfs_release_path(root, path); | |
f2eb0a24 SW |
3316 | } |
3317 | ||
5d9cd9ec | 3318 | ret = 0; |
f2eb0a24 SW |
3319 | out: |
3320 | btrfs_free_path(path); | |
f2eb0a24 SW |
3321 | |
3322 | inode->i_blocks = src->i_blocks; | |
3323 | i_size_write(inode, src->i_size); | |
3324 | btrfs_update_inode(trans, root, inode); | |
3325 | ||
3326 | unlock_extent(&BTRFS_I(src)->io_tree, 0, (u64)-1, GFP_NOFS); | |
3327 | ||
3328 | btrfs_end_transaction(trans, root); | |
3329 | mutex_unlock(&root->fs_info->fs_mutex); | |
3330 | ||
3331 | out_unlock: | |
3332 | mutex_unlock(&src->i_mutex); | |
3333 | mutex_unlock(&inode->i_mutex); | |
3334 | out_fput: | |
3335 | fput(src_file); | |
3336 | return ret; | |
3337 | } | |
3338 | ||
6bf13c0c SW |
3339 | /* |
3340 | * there are many ways the trans_start and trans_end ioctls can lead | |
3341 | * to deadlocks. They should only be used by applications that | |
3342 | * basically own the machine, and have a very in depth understanding | |
3343 | * of all the possible deadlocks and enospc problems. | |
3344 | */ | |
3345 | long btrfs_ioctl_trans_start(struct file *file) | |
3346 | { | |
3347 | struct inode *inode = fdentry(file)->d_inode; | |
3348 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3349 | struct btrfs_trans_handle *trans; | |
3350 | int ret = 0; | |
3351 | ||
3352 | mutex_lock(&root->fs_info->fs_mutex); | |
3353 | if (file->private_data) { | |
3354 | ret = -EINPROGRESS; | |
3355 | goto out; | |
3356 | } | |
3357 | trans = btrfs_start_transaction(root, 0); | |
3358 | if (trans) | |
3359 | file->private_data = trans; | |
3360 | else | |
3361 | ret = -ENOMEM; | |
3362 | /*printk(KERN_INFO "btrfs_ioctl_trans_start on %p\n", file);*/ | |
3363 | out: | |
3364 | mutex_unlock(&root->fs_info->fs_mutex); | |
3365 | return ret; | |
3366 | } | |
3367 | ||
3368 | /* | |
3369 | * there are many ways the trans_start and trans_end ioctls can lead | |
3370 | * to deadlocks. They should only be used by applications that | |
3371 | * basically own the machine, and have a very in depth understanding | |
3372 | * of all the possible deadlocks and enospc problems. | |
3373 | */ | |
3374 | long btrfs_ioctl_trans_end(struct file *file) | |
3375 | { | |
3376 | struct inode *inode = fdentry(file)->d_inode; | |
3377 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3378 | struct btrfs_trans_handle *trans; | |
3379 | int ret = 0; | |
3380 | ||
3381 | mutex_lock(&root->fs_info->fs_mutex); | |
3382 | trans = file->private_data; | |
3383 | if (!trans) { | |
3384 | ret = -EINVAL; | |
3385 | goto out; | |
3386 | } | |
3387 | btrfs_end_transaction(trans, root); | |
3388 | file->private_data = 0; | |
3389 | out: | |
3390 | mutex_unlock(&root->fs_info->fs_mutex); | |
3391 | return ret; | |
3392 | } | |
3393 | ||
d03581f4 CH |
3394 | long btrfs_ioctl(struct file *file, unsigned int |
3395 | cmd, unsigned long arg) | |
3396 | { | |
6da6abae | 3397 | struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; |
d03581f4 CH |
3398 | |
3399 | switch (cmd) { | |
3400 | case BTRFS_IOC_SNAP_CREATE: | |
3401 | return btrfs_ioctl_snap_create(root, (void __user *)arg); | |
6702ed49 | 3402 | case BTRFS_IOC_DEFRAG: |
d03581f4 | 3403 | return btrfs_ioctl_defrag(file); |
edbd8d4e CM |
3404 | case BTRFS_IOC_RESIZE: |
3405 | return btrfs_ioctl_resize(root, (void __user *)arg); | |
788f20eb CM |
3406 | case BTRFS_IOC_ADD_DEV: |
3407 | return btrfs_ioctl_add_dev(root, (void __user *)arg); | |
a061fc8d CM |
3408 | case BTRFS_IOC_RM_DEV: |
3409 | return btrfs_ioctl_rm_dev(root, (void __user *)arg); | |
ec44a35c CM |
3410 | case BTRFS_IOC_BALANCE: |
3411 | return btrfs_balance(root->fs_info->dev_root); | |
f2eb0a24 SW |
3412 | case BTRFS_IOC_CLONE: |
3413 | return btrfs_ioctl_clone(file, arg); | |
6bf13c0c SW |
3414 | case BTRFS_IOC_TRANS_START: |
3415 | return btrfs_ioctl_trans_start(file); | |
3416 | case BTRFS_IOC_TRANS_END: | |
3417 | return btrfs_ioctl_trans_end(file); | |
3418 | case BTRFS_IOC_SYNC: | |
3419 | btrfs_sync_fs(file->f_dentry->d_sb, 1); | |
3420 | return 0; | |
39279cc3 | 3421 | } |
d03581f4 CH |
3422 | |
3423 | return -ENOTTY; | |
39279cc3 CM |
3424 | } |
3425 | ||
39279cc3 CM |
3426 | /* |
3427 | * Called inside transaction, so use GFP_NOFS | |
3428 | */ | |
3429 | struct inode *btrfs_alloc_inode(struct super_block *sb) | |
3430 | { | |
3431 | struct btrfs_inode *ei; | |
3432 | ||
3433 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
3434 | if (!ei) | |
3435 | return NULL; | |
15ee9bc7 | 3436 | ei->last_trans = 0; |
dc17ff8f | 3437 | ei->ordered_trans = 0; |
39279cc3 CM |
3438 | return &ei->vfs_inode; |
3439 | } | |
3440 | ||
3441 | void btrfs_destroy_inode(struct inode *inode) | |
3442 | { | |
3443 | WARN_ON(!list_empty(&inode->i_dentry)); | |
3444 | WARN_ON(inode->i_data.nrpages); | |
3445 | ||
8c416c9e | 3446 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
3447 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
3448 | } | |
3449 | ||
44ec0b71 CM |
3450 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
3451 | static void init_once(struct kmem_cache * cachep, void *foo) | |
3452 | #else | |
39279cc3 CM |
3453 | static void init_once(void * foo, struct kmem_cache * cachep, |
3454 | unsigned long flags) | |
44ec0b71 | 3455 | #endif |
39279cc3 CM |
3456 | { |
3457 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
3458 | ||
3459 | inode_init_once(&ei->vfs_inode); | |
3460 | } | |
3461 | ||
3462 | void btrfs_destroy_cachep(void) | |
3463 | { | |
3464 | if (btrfs_inode_cachep) | |
3465 | kmem_cache_destroy(btrfs_inode_cachep); | |
3466 | if (btrfs_trans_handle_cachep) | |
3467 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
3468 | if (btrfs_transaction_cachep) | |
3469 | kmem_cache_destroy(btrfs_transaction_cachep); | |
3470 | if (btrfs_bit_radix_cachep) | |
3471 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
3472 | if (btrfs_path_cachep) | |
3473 | kmem_cache_destroy(btrfs_path_cachep); | |
3474 | } | |
3475 | ||
86479a04 | 3476 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 3477 | unsigned long extra_flags, |
44ec0b71 CM |
3478 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
3479 | void (*ctor)(struct kmem_cache *, void *) | |
3480 | #else | |
92fee66d | 3481 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
3482 | unsigned long) |
3483 | #endif | |
3484 | ) | |
92fee66d CM |
3485 | { |
3486 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
3487 | SLAB_MEM_SPREAD | extra_flags), ctor | |
3488 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
3489 | ,NULL | |
3490 | #endif | |
3491 | ); | |
3492 | } | |
3493 | ||
39279cc3 CM |
3494 | int btrfs_init_cachep(void) |
3495 | { | |
86479a04 | 3496 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
3497 | sizeof(struct btrfs_inode), |
3498 | 0, init_once); | |
39279cc3 CM |
3499 | if (!btrfs_inode_cachep) |
3500 | goto fail; | |
86479a04 CM |
3501 | btrfs_trans_handle_cachep = |
3502 | btrfs_cache_create("btrfs_trans_handle_cache", | |
3503 | sizeof(struct btrfs_trans_handle), | |
3504 | 0, NULL); | |
39279cc3 CM |
3505 | if (!btrfs_trans_handle_cachep) |
3506 | goto fail; | |
86479a04 | 3507 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 3508 | sizeof(struct btrfs_transaction), |
92fee66d | 3509 | 0, NULL); |
39279cc3 CM |
3510 | if (!btrfs_transaction_cachep) |
3511 | goto fail; | |
86479a04 | 3512 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 3513 | sizeof(struct btrfs_path), |
92fee66d | 3514 | 0, NULL); |
39279cc3 CM |
3515 | if (!btrfs_path_cachep) |
3516 | goto fail; | |
86479a04 | 3517 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 3518 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
3519 | if (!btrfs_bit_radix_cachep) |
3520 | goto fail; | |
3521 | return 0; | |
3522 | fail: | |
3523 | btrfs_destroy_cachep(); | |
3524 | return -ENOMEM; | |
3525 | } | |
3526 | ||
3527 | static int btrfs_getattr(struct vfsmount *mnt, | |
3528 | struct dentry *dentry, struct kstat *stat) | |
3529 | { | |
3530 | struct inode *inode = dentry->d_inode; | |
3531 | generic_fillattr(inode, stat); | |
d6667462 | 3532 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 3533 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
3534 | return 0; |
3535 | } | |
3536 | ||
3537 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
3538 | struct inode * new_dir,struct dentry *new_dentry) | |
3539 | { | |
3540 | struct btrfs_trans_handle *trans; | |
3541 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
3542 | struct inode *new_inode = new_dentry->d_inode; | |
3543 | struct inode *old_inode = old_dentry->d_inode; | |
3544 | struct timespec ctime = CURRENT_TIME; | |
3545 | struct btrfs_path *path; | |
39279cc3 CM |
3546 | int ret; |
3547 | ||
3548 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
3549 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
3550 | return -ENOTEMPTY; | |
3551 | } | |
5f39d397 | 3552 | |
39279cc3 | 3553 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
3554 | ret = btrfs_check_free_space(root, 1, 0); |
3555 | if (ret) | |
3556 | goto out_unlock; | |
3557 | ||
39279cc3 | 3558 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 3559 | |
39279cc3 CM |
3560 | btrfs_set_trans_block_group(trans, new_dir); |
3561 | path = btrfs_alloc_path(); | |
3562 | if (!path) { | |
3563 | ret = -ENOMEM; | |
3564 | goto out_fail; | |
3565 | } | |
3566 | ||
3567 | old_dentry->d_inode->i_nlink++; | |
3568 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
3569 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
3570 | old_inode->i_ctime = ctime; | |
5f39d397 | 3571 | |
39279cc3 CM |
3572 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
3573 | if (ret) | |
3574 | goto out_fail; | |
3575 | ||
3576 | if (new_inode) { | |
3577 | new_inode->i_ctime = CURRENT_TIME; | |
3578 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
3579 | if (ret) | |
3580 | goto out_fail; | |
39279cc3 | 3581 | } |
9c58309d | 3582 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1); |
39279cc3 CM |
3583 | if (ret) |
3584 | goto out_fail; | |
3585 | ||
3586 | out_fail: | |
3587 | btrfs_free_path(path); | |
3588 | btrfs_end_transaction(trans, root); | |
1832a6d5 | 3589 | out_unlock: |
39279cc3 CM |
3590 | mutex_unlock(&root->fs_info->fs_mutex); |
3591 | return ret; | |
3592 | } | |
3593 | ||
3594 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
3595 | const char *symname) | |
3596 | { | |
3597 | struct btrfs_trans_handle *trans; | |
3598 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
3599 | struct btrfs_path *path; | |
3600 | struct btrfs_key key; | |
1832a6d5 | 3601 | struct inode *inode = NULL; |
39279cc3 CM |
3602 | int err; |
3603 | int drop_inode = 0; | |
3604 | u64 objectid; | |
3605 | int name_len; | |
3606 | int datasize; | |
5f39d397 | 3607 | unsigned long ptr; |
39279cc3 | 3608 | struct btrfs_file_extent_item *ei; |
5f39d397 | 3609 | struct extent_buffer *leaf; |
1832a6d5 | 3610 | unsigned long nr = 0; |
39279cc3 CM |
3611 | |
3612 | name_len = strlen(symname) + 1; | |
3613 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
3614 | return -ENAMETOOLONG; | |
1832a6d5 | 3615 | |
39279cc3 | 3616 | mutex_lock(&root->fs_info->fs_mutex); |
1832a6d5 CM |
3617 | err = btrfs_check_free_space(root, 1, 0); |
3618 | if (err) | |
3619 | goto out_fail; | |
3620 | ||
39279cc3 CM |
3621 | trans = btrfs_start_transaction(root, 1); |
3622 | btrfs_set_trans_block_group(trans, dir); | |
3623 | ||
3624 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
3625 | if (err) { | |
3626 | err = -ENOSPC; | |
3627 | goto out_unlock; | |
3628 | } | |
3629 | ||
9c58309d CM |
3630 | inode = btrfs_new_inode(trans, root, dentry->d_name.name, |
3631 | dentry->d_name.len, | |
3632 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
3633 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); |
3634 | err = PTR_ERR(inode); | |
3635 | if (IS_ERR(inode)) | |
3636 | goto out_unlock; | |
3637 | ||
3638 | btrfs_set_trans_block_group(trans, inode); | |
9c58309d | 3639 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
3640 | if (err) |
3641 | drop_inode = 1; | |
3642 | else { | |
3643 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 3644 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
3645 | inode->i_fop = &btrfs_file_operations; |
3646 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
3647 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
3648 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 3649 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
3650 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
3651 | inode->i_mapping, GFP_NOFS); | |
9069218d | 3652 | BTRFS_I(inode)->delalloc_bytes = 0; |
81d7ed29 | 3653 | atomic_set(&BTRFS_I(inode)->ordered_writeback, 0); |
d1310b2e | 3654 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
3655 | } |
3656 | dir->i_sb->s_dirt = 1; | |
3657 | btrfs_update_inode_block_group(trans, inode); | |
3658 | btrfs_update_inode_block_group(trans, dir); | |
3659 | if (drop_inode) | |
3660 | goto out_unlock; | |
3661 | ||
3662 | path = btrfs_alloc_path(); | |
3663 | BUG_ON(!path); | |
3664 | key.objectid = inode->i_ino; | |
3665 | key.offset = 0; | |
39279cc3 CM |
3666 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
3667 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
3668 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
3669 | datasize); | |
54aa1f4d CM |
3670 | if (err) { |
3671 | drop_inode = 1; | |
3672 | goto out_unlock; | |
3673 | } | |
5f39d397 CM |
3674 | leaf = path->nodes[0]; |
3675 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
3676 | struct btrfs_file_extent_item); | |
3677 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
3678 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
3679 | BTRFS_FILE_EXTENT_INLINE); |
3680 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
3681 | write_extent_buffer(leaf, symname, ptr, name_len); |
3682 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 3683 | btrfs_free_path(path); |
5f39d397 | 3684 | |
39279cc3 CM |
3685 | inode->i_op = &btrfs_symlink_inode_operations; |
3686 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 3687 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 3688 | inode->i_size = name_len - 1; |
54aa1f4d CM |
3689 | err = btrfs_update_inode(trans, root, inode); |
3690 | if (err) | |
3691 | drop_inode = 1; | |
39279cc3 CM |
3692 | |
3693 | out_unlock: | |
d3c2fdcf | 3694 | nr = trans->blocks_used; |
39279cc3 | 3695 | btrfs_end_transaction(trans, root); |
1832a6d5 | 3696 | out_fail: |
39279cc3 | 3697 | mutex_unlock(&root->fs_info->fs_mutex); |
39279cc3 CM |
3698 | if (drop_inode) { |
3699 | inode_dec_link_count(inode); | |
3700 | iput(inode); | |
3701 | } | |
d3c2fdcf | 3702 | btrfs_btree_balance_dirty(root, nr); |
e2008b61 | 3703 | btrfs_throttle(root); |
39279cc3 CM |
3704 | return err; |
3705 | } | |
16432985 | 3706 | |
fdebe2bd Y |
3707 | static int btrfs_permission(struct inode *inode, int mask, |
3708 | struct nameidata *nd) | |
3709 | { | |
3710 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
3711 | return -EACCES; | |
3712 | return generic_permission(inode, mask, NULL); | |
3713 | } | |
39279cc3 CM |
3714 | |
3715 | static struct inode_operations btrfs_dir_inode_operations = { | |
3716 | .lookup = btrfs_lookup, | |
3717 | .create = btrfs_create, | |
3718 | .unlink = btrfs_unlink, | |
3719 | .link = btrfs_link, | |
3720 | .mkdir = btrfs_mkdir, | |
3721 | .rmdir = btrfs_rmdir, | |
3722 | .rename = btrfs_rename, | |
3723 | .symlink = btrfs_symlink, | |
3724 | .setattr = btrfs_setattr, | |
618e21d5 | 3725 | .mknod = btrfs_mknod, |
5103e947 JB |
3726 | .setxattr = generic_setxattr, |
3727 | .getxattr = generic_getxattr, | |
3728 | .listxattr = btrfs_listxattr, | |
3729 | .removexattr = generic_removexattr, | |
fdebe2bd | 3730 | .permission = btrfs_permission, |
39279cc3 | 3731 | }; |
39279cc3 CM |
3732 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3733 | .lookup = btrfs_lookup, | |
fdebe2bd | 3734 | .permission = btrfs_permission, |
39279cc3 | 3735 | }; |
39279cc3 CM |
3736 | static struct file_operations btrfs_dir_file_operations = { |
3737 | .llseek = generic_file_llseek, | |
3738 | .read = generic_read_dir, | |
3739 | .readdir = btrfs_readdir, | |
34287aa3 | 3740 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 3741 | #ifdef CONFIG_COMPAT |
34287aa3 | 3742 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 3743 | #endif |
6bf13c0c | 3744 | .release = btrfs_release_file, |
39279cc3 CM |
3745 | }; |
3746 | ||
d1310b2e | 3747 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 3748 | .fill_delalloc = run_delalloc_range, |
065631f6 | 3749 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 3750 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac CM |
3751 | .readpage_io_hook = btrfs_readpage_io_hook, |
3752 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
1259ab75 | 3753 | .readpage_io_failed_hook = btrfs_io_failed_hook, |
b0c68f8b CM |
3754 | .set_bit_hook = btrfs_set_bit_hook, |
3755 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
3756 | }; |
3757 | ||
39279cc3 CM |
3758 | static struct address_space_operations btrfs_aops = { |
3759 | .readpage = btrfs_readpage, | |
3760 | .writepage = btrfs_writepage, | |
b293f02e | 3761 | .writepages = btrfs_writepages, |
3ab2fb5a | 3762 | .readpages = btrfs_readpages, |
39279cc3 | 3763 | .sync_page = block_sync_page, |
39279cc3 | 3764 | .bmap = btrfs_bmap, |
16432985 | 3765 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
3766 | .invalidatepage = btrfs_invalidatepage, |
3767 | .releasepage = btrfs_releasepage, | |
3768 | .set_page_dirty = __set_page_dirty_nobuffers, | |
39279cc3 CM |
3769 | }; |
3770 | ||
3771 | static struct address_space_operations btrfs_symlink_aops = { | |
3772 | .readpage = btrfs_readpage, | |
3773 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3774 | .invalidatepage = btrfs_invalidatepage, |
3775 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3776 | }; |
3777 | ||
3778 | static struct inode_operations btrfs_file_inode_operations = { | |
3779 | .truncate = btrfs_truncate, | |
3780 | .getattr = btrfs_getattr, | |
3781 | .setattr = btrfs_setattr, | |
5103e947 JB |
3782 | .setxattr = generic_setxattr, |
3783 | .getxattr = generic_getxattr, | |
3784 | .listxattr = btrfs_listxattr, | |
3785 | .removexattr = generic_removexattr, | |
fdebe2bd | 3786 | .permission = btrfs_permission, |
39279cc3 | 3787 | }; |
618e21d5 JB |
3788 | static struct inode_operations btrfs_special_inode_operations = { |
3789 | .getattr = btrfs_getattr, | |
3790 | .setattr = btrfs_setattr, | |
fdebe2bd | 3791 | .permission = btrfs_permission, |
618e21d5 | 3792 | }; |
39279cc3 CM |
3793 | static struct inode_operations btrfs_symlink_inode_operations = { |
3794 | .readlink = generic_readlink, | |
3795 | .follow_link = page_follow_link_light, | |
3796 | .put_link = page_put_link, | |
fdebe2bd | 3797 | .permission = btrfs_permission, |
39279cc3 | 3798 | }; |