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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> |
33268eaf | 39 | #include <linux/posix_acl.h> |
39279cc3 CM |
40 | #include "ctree.h" |
41 | #include "disk-io.h" | |
42 | #include "transaction.h" | |
43 | #include "btrfs_inode.h" | |
44 | #include "ioctl.h" | |
45 | #include "print-tree.h" | |
0b86a832 | 46 | #include "volumes.h" |
e6dcd2dc | 47 | #include "ordered-data.h" |
39279cc3 CM |
48 | |
49 | struct btrfs_iget_args { | |
50 | u64 ino; | |
51 | struct btrfs_root *root; | |
52 | }; | |
53 | ||
54 | static struct inode_operations btrfs_dir_inode_operations; | |
55 | static struct inode_operations btrfs_symlink_inode_operations; | |
56 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 57 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
58 | static struct inode_operations btrfs_file_inode_operations; |
59 | static struct address_space_operations btrfs_aops; | |
60 | static struct address_space_operations btrfs_symlink_aops; | |
61 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 62 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
63 | |
64 | static struct kmem_cache *btrfs_inode_cachep; | |
65 | struct kmem_cache *btrfs_trans_handle_cachep; | |
66 | struct kmem_cache *btrfs_transaction_cachep; | |
67 | struct kmem_cache *btrfs_bit_radix_cachep; | |
68 | struct kmem_cache *btrfs_path_cachep; | |
69 | ||
70 | #define S_SHIFT 12 | |
71 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
72 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
73 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
74 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
75 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
76 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
77 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
78 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
79 | }; | |
80 | ||
7b128766 JB |
81 | static void btrfs_truncate(struct inode *inode); |
82 | ||
1832a6d5 CM |
83 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
84 | int for_del) | |
85 | { | |
a2135011 CM |
86 | u64 total; |
87 | u64 used; | |
1832a6d5 | 88 | u64 thresh; |
bcbfce8a | 89 | unsigned long flags; |
1832a6d5 CM |
90 | int ret = 0; |
91 | ||
a2135011 CM |
92 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
93 | total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
94 | used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
1832a6d5 | 95 | if (for_del) |
f9ef6604 | 96 | thresh = total * 90; |
1832a6d5 | 97 | else |
f9ef6604 CM |
98 | thresh = total * 85; |
99 | ||
100 | do_div(thresh, 100); | |
1832a6d5 | 101 | |
1832a6d5 CM |
102 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) |
103 | ret = -ENOSPC; | |
bcbfce8a | 104 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
1832a6d5 CM |
105 | return ret; |
106 | } | |
107 | ||
be20aa9d | 108 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
109 | { |
110 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
111 | struct btrfs_trans_handle *trans; | |
b888db2b | 112 | u64 alloc_hint = 0; |
db94535d | 113 | u64 num_bytes; |
c59f8951 | 114 | u64 cur_alloc_size; |
db94535d | 115 | u64 blocksize = root->sectorsize; |
d1310b2e | 116 | u64 orig_num_bytes; |
be20aa9d | 117 | struct btrfs_key ins; |
e6dcd2dc CM |
118 | struct extent_map *em; |
119 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
120 | int ret = 0; | |
b888db2b | 121 | |
f9295749 | 122 | trans = btrfs_join_transaction(root, 1); |
b888db2b | 123 | BUG_ON(!trans); |
be20aa9d CM |
124 | btrfs_set_trans_block_group(trans, inode); |
125 | ||
db94535d | 126 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 127 | num_bytes = max(blocksize, num_bytes); |
d1310b2e | 128 | orig_num_bytes = num_bytes; |
db94535d | 129 | |
179e29e4 CM |
130 | if (alloc_hint == EXTENT_MAP_INLINE) |
131 | goto out; | |
132 | ||
3b951516 | 133 | BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy)); |
e5a2217e | 134 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
e6dcd2dc | 135 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1); |
e5a2217e | 136 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
3b951516 | 137 | |
c59f8951 CM |
138 | while(num_bytes > 0) { |
139 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
e6dcd2dc CM |
140 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
141 | root->sectorsize, 0, 0, | |
142 | (u64)-1, &ins, 1); | |
c59f8951 CM |
143 | if (ret) { |
144 | WARN_ON(1); | |
145 | goto out; | |
146 | } | |
e6dcd2dc CM |
147 | em = alloc_extent_map(GFP_NOFS); |
148 | em->start = start; | |
149 | em->len = ins.offset; | |
150 | em->block_start = ins.objectid; | |
151 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
e5a2217e | 152 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
7f3c74fb | 153 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
e6dcd2dc CM |
154 | while(1) { |
155 | spin_lock(&em_tree->lock); | |
156 | ret = add_extent_mapping(em_tree, em); | |
157 | spin_unlock(&em_tree->lock); | |
158 | if (ret != -EEXIST) { | |
159 | free_extent_map(em); | |
160 | break; | |
161 | } | |
162 | btrfs_drop_extent_cache(inode, start, | |
163 | start + ins.offset - 1); | |
164 | } | |
e5a2217e | 165 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
e6dcd2dc | 166 | |
98d20f67 | 167 | cur_alloc_size = ins.offset; |
e6dcd2dc CM |
168 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
169 | ins.offset); | |
170 | BUG_ON(ret); | |
3b951516 CM |
171 | if (num_bytes < cur_alloc_size) { |
172 | printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes, | |
173 | cur_alloc_size); | |
174 | break; | |
175 | } | |
c59f8951 CM |
176 | num_bytes -= cur_alloc_size; |
177 | alloc_hint = ins.objectid + ins.offset; | |
178 | start += cur_alloc_size; | |
b888db2b | 179 | } |
b888db2b CM |
180 | out: |
181 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
182 | return ret; |
183 | } | |
184 | ||
185 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
186 | { | |
187 | u64 extent_start; | |
188 | u64 extent_end; | |
189 | u64 bytenr; | |
190 | u64 cow_end; | |
1832a6d5 | 191 | u64 loops = 0; |
c31f8830 | 192 | u64 total_fs_bytes; |
be20aa9d | 193 | struct btrfs_root *root = BTRFS_I(inode)->root; |
a68d5933 | 194 | struct btrfs_block_group_cache *block_group; |
be20aa9d CM |
195 | struct extent_buffer *leaf; |
196 | int found_type; | |
197 | struct btrfs_path *path; | |
198 | struct btrfs_file_extent_item *item; | |
199 | int ret; | |
200 | int err; | |
201 | struct btrfs_key found_key; | |
202 | ||
c31f8830 | 203 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
204 | path = btrfs_alloc_path(); |
205 | BUG_ON(!path); | |
206 | again: | |
207 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
208 | inode->i_ino, start, 0); | |
209 | if (ret < 0) { | |
210 | btrfs_free_path(path); | |
211 | return ret; | |
212 | } | |
213 | ||
214 | cow_end = end; | |
215 | if (ret != 0) { | |
216 | if (path->slots[0] == 0) | |
217 | goto not_found; | |
218 | path->slots[0]--; | |
219 | } | |
220 | ||
221 | leaf = path->nodes[0]; | |
222 | item = btrfs_item_ptr(leaf, path->slots[0], | |
223 | struct btrfs_file_extent_item); | |
224 | ||
225 | /* are we inside the extent that was found? */ | |
226 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
227 | found_type = btrfs_key_type(&found_key); | |
228 | if (found_key.objectid != inode->i_ino || | |
bbaf549e | 229 | found_type != BTRFS_EXTENT_DATA_KEY) |
be20aa9d | 230 | goto not_found; |
be20aa9d CM |
231 | |
232 | found_type = btrfs_file_extent_type(leaf, item); | |
233 | extent_start = found_key.offset; | |
234 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
235 | u64 extent_num_bytes; |
236 | ||
237 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
238 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
239 | err = 0; |
240 | ||
1832a6d5 CM |
241 | if (loops && start != extent_start) |
242 | goto not_found; | |
243 | ||
be20aa9d CM |
244 | if (start < extent_start || start >= extent_end) |
245 | goto not_found; | |
246 | ||
247 | cow_end = min(end, extent_end - 1); | |
248 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); | |
249 | if (bytenr == 0) | |
250 | goto not_found; | |
251 | ||
a68d5933 CM |
252 | if (btrfs_count_snapshots_in_path(root, path, inode->i_ino, |
253 | bytenr) != 1) { | |
254 | goto not_found; | |
255 | } | |
256 | ||
c31f8830 CM |
257 | /* |
258 | * we may be called by the resizer, make sure we're inside | |
259 | * the limits of the FS | |
260 | */ | |
a68d5933 CM |
261 | block_group = btrfs_lookup_block_group(root->fs_info, |
262 | bytenr); | |
263 | if (!block_group || block_group->ro) | |
c31f8830 CM |
264 | goto not_found; |
265 | ||
be20aa9d | 266 | start = extent_end; |
bd09835d | 267 | } else { |
be20aa9d CM |
268 | goto not_found; |
269 | } | |
270 | loop: | |
271 | if (start > end) { | |
272 | btrfs_free_path(path); | |
273 | return 0; | |
274 | } | |
275 | btrfs_release_path(root, path); | |
1832a6d5 | 276 | loops++; |
be20aa9d CM |
277 | goto again; |
278 | ||
279 | not_found: | |
bbaf549e CM |
280 | cow_file_range(inode, start, end); |
281 | start = end + 1; | |
be20aa9d CM |
282 | goto loop; |
283 | } | |
284 | ||
285 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
286 | { | |
287 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
288 | int ret; | |
a2135011 | 289 | |
b98b6767 Y |
290 | if (btrfs_test_opt(root, NODATACOW) || |
291 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
292 | ret = run_delalloc_nocow(inode, start, end); |
293 | else | |
294 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 295 | |
b888db2b CM |
296 | return ret; |
297 | } | |
298 | ||
291d673e | 299 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 300 | unsigned long old, unsigned long bits) |
291d673e | 301 | { |
bcbfce8a | 302 | unsigned long flags; |
b0c68f8b | 303 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 304 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a | 305 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
9069218d | 306 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e | 307 | root->fs_info->delalloc_bytes += end - start + 1; |
bcbfce8a | 308 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
309 | } |
310 | return 0; | |
311 | } | |
312 | ||
313 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 314 | unsigned long old, unsigned long bits) |
291d673e | 315 | { |
b0c68f8b | 316 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 317 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a CM |
318 | unsigned long flags; |
319 | ||
320 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
b0c68f8b CM |
321 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
322 | printk("warning: delalloc account %Lu %Lu\n", | |
323 | end - start + 1, root->fs_info->delalloc_bytes); | |
324 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 325 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
326 | } else { |
327 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 328 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 329 | } |
bcbfce8a | 330 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
331 | } |
332 | return 0; | |
333 | } | |
334 | ||
239b14b3 CM |
335 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
336 | size_t size, struct bio *bio) | |
337 | { | |
338 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
339 | struct btrfs_mapping_tree *map_tree; | |
239b14b3 | 340 | u64 logical = bio->bi_sector << 9; |
239b14b3 CM |
341 | u64 length = 0; |
342 | u64 map_length; | |
239b14b3 CM |
343 | int ret; |
344 | ||
f2d8d74d | 345 | length = bio->bi_size; |
239b14b3 CM |
346 | map_tree = &root->fs_info->mapping_tree; |
347 | map_length = length; | |
cea9e445 | 348 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 349 | &map_length, NULL, 0); |
cea9e445 | 350 | |
239b14b3 | 351 | if (map_length < length + size) { |
239b14b3 CM |
352 | return 1; |
353 | } | |
354 | return 0; | |
355 | } | |
356 | ||
44b8bd7e | 357 | int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
f188591e | 358 | int mirror_num) |
065631f6 | 359 | { |
065631f6 | 360 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 361 | int ret = 0; |
e015640f | 362 | |
3edf7d33 | 363 | ret = btrfs_csum_one_bio(root, inode, bio); |
44b8bd7e | 364 | BUG_ON(ret); |
e015640f | 365 | |
8b712842 | 366 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
44b8bd7e CM |
367 | } |
368 | ||
369 | int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, | |
370 | int mirror_num) | |
371 | { | |
372 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
373 | int ret = 0; | |
374 | ||
e6dcd2dc CM |
375 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); |
376 | BUG_ON(ret); | |
065631f6 | 377 | |
e6dcd2dc | 378 | if (!(rw & (1 << BIO_RW))) { |
0b86a832 CM |
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: |
8b712842 | 386 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
065631f6 | 387 | } |
6885f308 | 388 | |
ba1da2f4 | 389 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
390 | struct inode *inode, u64 file_offset, |
391 | struct list_head *list) | |
392 | { | |
393 | struct list_head *cur; | |
394 | struct btrfs_ordered_sum *sum; | |
395 | ||
396 | btrfs_set_trans_block_group(trans, inode); | |
ba1da2f4 | 397 | list_for_each(cur, list) { |
e6dcd2dc CM |
398 | sum = list_entry(cur, struct btrfs_ordered_sum, list); |
399 | mutex_lock(&BTRFS_I(inode)->csum_mutex); | |
400 | btrfs_csum_file_blocks(trans, BTRFS_I(inode)->root, | |
401 | inode, sum); | |
402 | mutex_unlock(&BTRFS_I(inode)->csum_mutex); | |
e6dcd2dc CM |
403 | } |
404 | return 0; | |
405 | } | |
406 | ||
247e743c CM |
407 | struct btrfs_writepage_fixup { |
408 | struct page *page; | |
409 | struct btrfs_work work; | |
410 | }; | |
411 | ||
412 | /* see btrfs_writepage_start_hook for details on why this is required */ | |
413 | void btrfs_writepage_fixup_worker(struct btrfs_work *work) | |
414 | { | |
415 | struct btrfs_writepage_fixup *fixup; | |
416 | struct btrfs_ordered_extent *ordered; | |
417 | struct page *page; | |
418 | struct inode *inode; | |
419 | u64 page_start; | |
420 | u64 page_end; | |
421 | ||
422 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
423 | page = fixup->page; | |
4a096752 | 424 | again: |
247e743c CM |
425 | lock_page(page); |
426 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
427 | ClearPageChecked(page); | |
428 | goto out_page; | |
429 | } | |
430 | ||
431 | inode = page->mapping->host; | |
432 | page_start = page_offset(page); | |
433 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
434 | ||
435 | lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); | |
4a096752 CM |
436 | |
437 | /* already ordered? We're done */ | |
438 | if (test_range_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, | |
439 | EXTENT_ORDERED, 0)) { | |
247e743c | 440 | goto out; |
4a096752 CM |
441 | } |
442 | ||
443 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
444 | if (ordered) { | |
445 | unlock_extent(&BTRFS_I(inode)->io_tree, page_start, | |
446 | page_end, GFP_NOFS); | |
447 | unlock_page(page); | |
448 | btrfs_start_ordered_extent(inode, ordered, 1); | |
449 | goto again; | |
450 | } | |
247e743c CM |
451 | |
452 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, page_end, | |
453 | GFP_NOFS); | |
454 | ClearPageChecked(page); | |
455 | out: | |
456 | unlock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); | |
457 | out_page: | |
458 | unlock_page(page); | |
459 | page_cache_release(page); | |
460 | } | |
461 | ||
462 | /* | |
463 | * There are a few paths in the higher layers of the kernel that directly | |
464 | * set the page dirty bit without asking the filesystem if it is a | |
465 | * good idea. This causes problems because we want to make sure COW | |
466 | * properly happens and the data=ordered rules are followed. | |
467 | * | |
468 | * In our case any range that doesn't have the EXTENT_ORDERED bit set | |
469 | * hasn't been properly setup for IO. We kick off an async process | |
470 | * to fix it up. The async helper will wait for ordered extents, set | |
471 | * the delalloc bit and make it safe to write the page. | |
472 | */ | |
473 | int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) | |
474 | { | |
475 | struct inode *inode = page->mapping->host; | |
476 | struct btrfs_writepage_fixup *fixup; | |
477 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
478 | int ret; | |
479 | ||
480 | ret = test_range_bit(&BTRFS_I(inode)->io_tree, start, end, | |
481 | EXTENT_ORDERED, 0); | |
482 | if (ret) | |
483 | return 0; | |
484 | ||
485 | if (PageChecked(page)) | |
486 | return -EAGAIN; | |
487 | ||
488 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
489 | if (!fixup) | |
490 | return -EAGAIN; | |
f421950f | 491 | |
247e743c CM |
492 | SetPageChecked(page); |
493 | page_cache_get(page); | |
494 | fixup->work.func = btrfs_writepage_fixup_worker; | |
495 | fixup->page = page; | |
496 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); | |
497 | return -EAGAIN; | |
498 | } | |
499 | ||
211f90e6 | 500 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) |
e6dcd2dc | 501 | { |
e6dcd2dc CM |
502 | struct btrfs_root *root = BTRFS_I(inode)->root; |
503 | struct btrfs_trans_handle *trans; | |
504 | struct btrfs_ordered_extent *ordered_extent; | |
505 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
7f3c74fb CM |
506 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
507 | struct extent_map *em; | |
f421950f | 508 | struct extent_map *em_orig; |
e6dcd2dc | 509 | u64 alloc_hint = 0; |
e5a2217e CM |
510 | u64 clear_start; |
511 | u64 clear_end; | |
e6dcd2dc CM |
512 | struct list_head list; |
513 | struct btrfs_key ins; | |
f421950f | 514 | struct rb_node *rb; |
e6dcd2dc CM |
515 | int ret; |
516 | ||
517 | ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1); | |
ba1da2f4 | 518 | if (!ret) |
e6dcd2dc | 519 | return 0; |
e6dcd2dc | 520 | |
f9295749 | 521 | trans = btrfs_join_transaction(root, 1); |
e6dcd2dc CM |
522 | |
523 | ordered_extent = btrfs_lookup_ordered_extent(inode, start); | |
524 | BUG_ON(!ordered_extent); | |
525 | ||
526 | lock_extent(io_tree, ordered_extent->file_offset, | |
527 | ordered_extent->file_offset + ordered_extent->len - 1, | |
528 | GFP_NOFS); | |
529 | ||
530 | INIT_LIST_HEAD(&list); | |
531 | ||
532 | ins.objectid = ordered_extent->start; | |
533 | ins.offset = ordered_extent->len; | |
534 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
e5a2217e | 535 | |
e6dcd2dc CM |
536 | ret = btrfs_alloc_reserved_extent(trans, root, root->root_key.objectid, |
537 | trans->transid, inode->i_ino, | |
538 | ordered_extent->file_offset, &ins); | |
539 | BUG_ON(ret); | |
ee6e6504 CM |
540 | |
541 | mutex_lock(&BTRFS_I(inode)->extent_mutex); | |
e5a2217e | 542 | |
f421950f CM |
543 | spin_lock(&em_tree->lock); |
544 | clear_start = ordered_extent->file_offset; | |
545 | clear_end = ordered_extent->file_offset + ordered_extent->len; | |
546 | em = lookup_extent_mapping(em_tree, clear_start, | |
547 | ordered_extent->len); | |
548 | em_orig = em; | |
549 | while(em && clear_start < extent_map_end(em) && clear_end > em->start) { | |
550 | clear_bit(EXTENT_FLAG_PINNED, &em->flags); | |
551 | rb = rb_next(&em->rb_node); | |
552 | if (!rb) | |
553 | break; | |
554 | em = rb_entry(rb, struct extent_map, rb_node); | |
555 | } | |
556 | free_extent_map(em_orig); | |
557 | spin_unlock(&em_tree->lock); | |
558 | ||
e6dcd2dc CM |
559 | ret = btrfs_drop_extents(trans, root, inode, |
560 | ordered_extent->file_offset, | |
561 | ordered_extent->file_offset + | |
562 | ordered_extent->len, | |
563 | ordered_extent->file_offset, &alloc_hint); | |
564 | BUG_ON(ret); | |
565 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
566 | ordered_extent->file_offset, | |
567 | ordered_extent->start, | |
568 | ordered_extent->len, | |
569 | ordered_extent->len, 0); | |
570 | BUG_ON(ret); | |
7f3c74fb | 571 | |
e6dcd2dc CM |
572 | btrfs_drop_extent_cache(inode, ordered_extent->file_offset, |
573 | ordered_extent->file_offset + | |
574 | ordered_extent->len - 1); | |
ee6e6504 CM |
575 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
576 | ||
e6dcd2dc CM |
577 | inode->i_blocks += ordered_extent->len >> 9; |
578 | unlock_extent(io_tree, ordered_extent->file_offset, | |
579 | ordered_extent->file_offset + ordered_extent->len - 1, | |
580 | GFP_NOFS); | |
581 | add_pending_csums(trans, inode, ordered_extent->file_offset, | |
582 | &ordered_extent->list); | |
583 | ||
dbe674a9 | 584 | btrfs_ordered_update_i_size(inode, ordered_extent); |
e6dcd2dc | 585 | btrfs_remove_ordered_extent(inode, ordered_extent); |
7f3c74fb | 586 | |
e6dcd2dc CM |
587 | /* once for us */ |
588 | btrfs_put_ordered_extent(ordered_extent); | |
589 | /* once for the tree */ | |
590 | btrfs_put_ordered_extent(ordered_extent); | |
591 | ||
592 | btrfs_update_inode(trans, root, inode); | |
593 | btrfs_end_transaction(trans, root); | |
594 | return 0; | |
595 | } | |
596 | ||
211f90e6 CM |
597 | int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
598 | struct extent_state *state, int uptodate) | |
599 | { | |
600 | return btrfs_finish_ordered_io(page->mapping->host, start, end); | |
601 | } | |
602 | ||
07157aac CM |
603 | int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end) |
604 | { | |
605 | int ret = 0; | |
606 | struct inode *inode = page->mapping->host; | |
607 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 608 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac CM |
609 | struct btrfs_csum_item *item; |
610 | struct btrfs_path *path = NULL; | |
ff79f819 | 611 | u32 csum; |
699122f5 | 612 | |
b98b6767 Y |
613 | if (btrfs_test_opt(root, NODATASUM) || |
614 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 615 | return 0; |
699122f5 | 616 | |
89642229 CM |
617 | /* |
618 | * It is possible there is an ordered extent that has | |
619 | * not yet finished for this range in the file. If so, | |
620 | * that extent will have a csum cached, and it will insert | |
621 | * the sum after all the blocks in the extent are fully | |
622 | * on disk. So, look for an ordered extent and use the | |
623 | * sum if found. We have to do this before looking in the | |
624 | * btree because csum items are pre-inserted based on | |
625 | * the file size. btrfs_lookup_csum might find an item | |
626 | * that still hasn't been fully filled. | |
627 | */ | |
628 | ret = btrfs_find_ordered_sum(inode, start, &csum); | |
629 | if (ret == 0) | |
630 | goto found; | |
631 | ||
632 | ret = 0; | |
07157aac CM |
633 | path = btrfs_alloc_path(); |
634 | item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0); | |
635 | if (IS_ERR(item)) { | |
636 | ret = PTR_ERR(item); | |
637 | /* a csum that isn't present is a preallocated region. */ | |
638 | if (ret == -ENOENT || ret == -EFBIG) | |
639 | ret = 0; | |
ff79f819 | 640 | csum = 0; |
e6dcd2dc CM |
641 | printk("no csum found for inode %lu start %Lu\n", inode->i_ino, |
642 | start); | |
07157aac CM |
643 | goto out; |
644 | } | |
ff79f819 CM |
645 | read_extent_buffer(path->nodes[0], &csum, (unsigned long)item, |
646 | BTRFS_CRC32_SIZE); | |
ba1da2f4 | 647 | found: |
d1310b2e | 648 | set_state_private(io_tree, start, csum); |
07157aac CM |
649 | out: |
650 | if (path) | |
651 | btrfs_free_path(path); | |
07157aac CM |
652 | return ret; |
653 | } | |
654 | ||
7e38326f CM |
655 | struct io_failure_record { |
656 | struct page *page; | |
657 | u64 start; | |
658 | u64 len; | |
659 | u64 logical; | |
660 | int last_mirror; | |
661 | }; | |
662 | ||
1259ab75 CM |
663 | int btrfs_io_failed_hook(struct bio *failed_bio, |
664 | struct page *page, u64 start, u64 end, | |
665 | struct extent_state *state) | |
7e38326f CM |
666 | { |
667 | struct io_failure_record *failrec = NULL; | |
668 | u64 private; | |
669 | struct extent_map *em; | |
670 | struct inode *inode = page->mapping->host; | |
671 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
3b951516 | 672 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
7e38326f CM |
673 | struct bio *bio; |
674 | int num_copies; | |
675 | int ret; | |
1259ab75 | 676 | int rw; |
7e38326f CM |
677 | u64 logical; |
678 | ||
679 | ret = get_state_private(failure_tree, start, &private); | |
680 | if (ret) { | |
7e38326f CM |
681 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); |
682 | if (!failrec) | |
683 | return -ENOMEM; | |
684 | failrec->start = start; | |
685 | failrec->len = end - start + 1; | |
686 | failrec->last_mirror = 0; | |
687 | ||
3b951516 CM |
688 | spin_lock(&em_tree->lock); |
689 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
690 | if (em->start > start || em->start + em->len < start) { | |
691 | free_extent_map(em); | |
692 | em = NULL; | |
693 | } | |
694 | spin_unlock(&em_tree->lock); | |
7e38326f CM |
695 | |
696 | if (!em || IS_ERR(em)) { | |
697 | kfree(failrec); | |
698 | return -EIO; | |
699 | } | |
700 | logical = start - em->start; | |
701 | logical = em->block_start + logical; | |
702 | failrec->logical = logical; | |
703 | free_extent_map(em); | |
704 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | | |
705 | EXTENT_DIRTY, GFP_NOFS); | |
587f7704 CM |
706 | set_state_private(failure_tree, start, |
707 | (u64)(unsigned long)failrec); | |
7e38326f | 708 | } else { |
587f7704 | 709 | failrec = (struct io_failure_record *)(unsigned long)private; |
7e38326f CM |
710 | } |
711 | num_copies = btrfs_num_copies( | |
712 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
713 | failrec->logical, failrec->len); | |
714 | failrec->last_mirror++; | |
715 | if (!state) { | |
716 | spin_lock_irq(&BTRFS_I(inode)->io_tree.lock); | |
717 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
718 | failrec->start, | |
719 | EXTENT_LOCKED); | |
720 | if (state && state->start != failrec->start) | |
721 | state = NULL; | |
722 | spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock); | |
723 | } | |
724 | if (!state || failrec->last_mirror > num_copies) { | |
725 | set_state_private(failure_tree, failrec->start, 0); | |
726 | clear_extent_bits(failure_tree, failrec->start, | |
727 | failrec->start + failrec->len - 1, | |
728 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
729 | kfree(failrec); | |
730 | return -EIO; | |
731 | } | |
732 | bio = bio_alloc(GFP_NOFS, 1); | |
733 | bio->bi_private = state; | |
734 | bio->bi_end_io = failed_bio->bi_end_io; | |
735 | bio->bi_sector = failrec->logical >> 9; | |
736 | bio->bi_bdev = failed_bio->bi_bdev; | |
e1c4b745 | 737 | bio->bi_size = 0; |
7e38326f | 738 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
1259ab75 CM |
739 | if (failed_bio->bi_rw & (1 << BIO_RW)) |
740 | rw = WRITE; | |
741 | else | |
742 | rw = READ; | |
743 | ||
744 | BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio, | |
745 | failrec->last_mirror); | |
746 | return 0; | |
747 | } | |
748 | ||
749 | int btrfs_clean_io_failures(struct inode *inode, u64 start) | |
750 | { | |
751 | u64 private; | |
752 | u64 private_failure; | |
753 | struct io_failure_record *failure; | |
754 | int ret; | |
755 | ||
756 | private = 0; | |
757 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
758 | (u64)-1, 1, EXTENT_DIRTY)) { | |
759 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, | |
760 | start, &private_failure); | |
761 | if (ret == 0) { | |
762 | failure = (struct io_failure_record *)(unsigned long) | |
763 | private_failure; | |
764 | set_state_private(&BTRFS_I(inode)->io_failure_tree, | |
765 | failure->start, 0); | |
766 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, | |
767 | failure->start, | |
768 | failure->start + failure->len - 1, | |
769 | EXTENT_DIRTY | EXTENT_LOCKED, | |
770 | GFP_NOFS); | |
771 | kfree(failure); | |
772 | } | |
773 | } | |
7e38326f CM |
774 | return 0; |
775 | } | |
776 | ||
70dec807 CM |
777 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
778 | struct extent_state *state) | |
07157aac | 779 | { |
35ebb934 | 780 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 781 | struct inode *inode = page->mapping->host; |
d1310b2e | 782 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 783 | char *kaddr; |
aadfeb6e | 784 | u64 private = ~(u32)0; |
07157aac | 785 | int ret; |
ff79f819 CM |
786 | struct btrfs_root *root = BTRFS_I(inode)->root; |
787 | u32 csum = ~(u32)0; | |
bbf0d006 | 788 | unsigned long flags; |
d1310b2e | 789 | |
b98b6767 Y |
790 | if (btrfs_test_opt(root, NODATASUM) || |
791 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 792 | return 0; |
c2e639f0 | 793 | if (state && state->start == start) { |
70dec807 CM |
794 | private = state->private; |
795 | ret = 0; | |
796 | } else { | |
797 | ret = get_state_private(io_tree, start, &private); | |
798 | } | |
bbf0d006 | 799 | local_irq_save(flags); |
07157aac CM |
800 | kaddr = kmap_atomic(page, KM_IRQ0); |
801 | if (ret) { | |
802 | goto zeroit; | |
803 | } | |
ff79f819 CM |
804 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
805 | btrfs_csum_final(csum, (char *)&csum); | |
806 | if (csum != private) { | |
07157aac CM |
807 | goto zeroit; |
808 | } | |
809 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 810 | local_irq_restore(flags); |
7e38326f CM |
811 | |
812 | /* if the io failure tree for this inode is non-empty, | |
813 | * check to see if we've recovered from a failed IO | |
814 | */ | |
1259ab75 | 815 | btrfs_clean_io_failures(inode, start); |
07157aac CM |
816 | return 0; |
817 | ||
818 | zeroit: | |
aadfeb6e CM |
819 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
820 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
821 | private); | |
db94535d CM |
822 | memset(kaddr + offset, 1, end - start + 1); |
823 | flush_dcache_page(page); | |
07157aac | 824 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 825 | local_irq_restore(flags); |
3b951516 CM |
826 | if (private == 0) |
827 | return 0; | |
7e38326f | 828 | return -EIO; |
07157aac | 829 | } |
b888db2b | 830 | |
7b128766 JB |
831 | /* |
832 | * This creates an orphan entry for the given inode in case something goes | |
833 | * wrong in the middle of an unlink/truncate. | |
834 | */ | |
835 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
836 | { | |
837 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
838 | int ret = 0; | |
839 | ||
840 | spin_lock(&root->orphan_lock); | |
841 | ||
842 | /* already on the orphan list, we're good */ | |
843 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { | |
844 | spin_unlock(&root->orphan_lock); | |
845 | return 0; | |
846 | } | |
847 | ||
848 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); | |
849 | ||
850 | spin_unlock(&root->orphan_lock); | |
851 | ||
852 | /* | |
853 | * insert an orphan item to track this unlinked/truncated file | |
854 | */ | |
855 | ret = btrfs_insert_orphan_item(trans, root, inode->i_ino); | |
856 | ||
857 | return ret; | |
858 | } | |
859 | ||
860 | /* | |
861 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
862 | * item for this particular inode. | |
863 | */ | |
864 | int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) | |
865 | { | |
866 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
867 | int ret = 0; | |
868 | ||
869 | spin_lock(&root->orphan_lock); | |
870 | ||
871 | if (list_empty(&BTRFS_I(inode)->i_orphan)) { | |
872 | spin_unlock(&root->orphan_lock); | |
873 | return 0; | |
874 | } | |
875 | ||
876 | list_del_init(&BTRFS_I(inode)->i_orphan); | |
877 | if (!trans) { | |
878 | spin_unlock(&root->orphan_lock); | |
879 | return 0; | |
880 | } | |
881 | ||
882 | spin_unlock(&root->orphan_lock); | |
883 | ||
884 | ret = btrfs_del_orphan_item(trans, root, inode->i_ino); | |
885 | ||
886 | return ret; | |
887 | } | |
888 | ||
889 | /* | |
890 | * this cleans up any orphans that may be left on the list from the last use | |
891 | * of this root. | |
892 | */ | |
893 | void btrfs_orphan_cleanup(struct btrfs_root *root) | |
894 | { | |
895 | struct btrfs_path *path; | |
896 | struct extent_buffer *leaf; | |
897 | struct btrfs_item *item; | |
898 | struct btrfs_key key, found_key; | |
899 | struct btrfs_trans_handle *trans; | |
900 | struct inode *inode; | |
901 | int ret = 0, nr_unlink = 0, nr_truncate = 0; | |
902 | ||
903 | /* don't do orphan cleanup if the fs is readonly. */ | |
904 | if (root->inode->i_sb->s_flags & MS_RDONLY) | |
905 | return; | |
906 | ||
907 | path = btrfs_alloc_path(); | |
908 | if (!path) | |
909 | return; | |
910 | path->reada = -1; | |
911 | ||
912 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
913 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); | |
914 | key.offset = (u64)-1; | |
915 | ||
916 | trans = btrfs_start_transaction(root, 1); | |
917 | btrfs_set_trans_block_group(trans, root->inode); | |
918 | ||
919 | while (1) { | |
920 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
921 | if (ret < 0) { | |
922 | printk(KERN_ERR "Error searching slot for orphan: %d" | |
923 | "\n", ret); | |
924 | break; | |
925 | } | |
926 | ||
927 | /* | |
928 | * if ret == 0 means we found what we were searching for, which | |
929 | * is weird, but possible, so only screw with path if we didnt | |
930 | * find the key and see if we have stuff that matches | |
931 | */ | |
932 | if (ret > 0) { | |
933 | if (path->slots[0] == 0) | |
934 | break; | |
935 | path->slots[0]--; | |
936 | } | |
937 | ||
938 | /* pull out the item */ | |
939 | leaf = path->nodes[0]; | |
940 | item = btrfs_item_nr(leaf, path->slots[0]); | |
941 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
942 | ||
943 | /* make sure the item matches what we want */ | |
944 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
945 | break; | |
946 | if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY) | |
947 | break; | |
948 | ||
949 | /* release the path since we're done with it */ | |
950 | btrfs_release_path(root, path); | |
951 | ||
952 | /* | |
953 | * this is where we are basically btrfs_lookup, without the | |
954 | * crossing root thing. we store the inode number in the | |
955 | * offset of the orphan item. | |
956 | */ | |
957 | inode = btrfs_iget_locked(root->inode->i_sb, | |
958 | found_key.offset, root); | |
959 | if (!inode) | |
960 | break; | |
961 | ||
962 | if (inode->i_state & I_NEW) { | |
963 | BTRFS_I(inode)->root = root; | |
964 | ||
965 | /* have to set the location manually */ | |
966 | BTRFS_I(inode)->location.objectid = inode->i_ino; | |
967 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
968 | BTRFS_I(inode)->location.offset = 0; | |
969 | ||
970 | btrfs_read_locked_inode(inode); | |
971 | unlock_new_inode(inode); | |
972 | } | |
973 | ||
974 | /* | |
975 | * add this inode to the orphan list so btrfs_orphan_del does | |
976 | * the proper thing when we hit it | |
977 | */ | |
978 | spin_lock(&root->orphan_lock); | |
979 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); | |
980 | spin_unlock(&root->orphan_lock); | |
981 | ||
982 | /* | |
983 | * if this is a bad inode, means we actually succeeded in | |
984 | * removing the inode, but not the orphan record, which means | |
985 | * we need to manually delete the orphan since iput will just | |
986 | * do a destroy_inode | |
987 | */ | |
988 | if (is_bad_inode(inode)) { | |
989 | btrfs_orphan_del(trans, inode); | |
990 | iput(inode); | |
991 | continue; | |
992 | } | |
993 | ||
994 | /* if we have links, this was a truncate, lets do that */ | |
995 | if (inode->i_nlink) { | |
996 | nr_truncate++; | |
997 | btrfs_truncate(inode); | |
998 | } else { | |
999 | nr_unlink++; | |
1000 | } | |
1001 | ||
1002 | /* this will do delete_inode and everything for us */ | |
1003 | iput(inode); | |
1004 | } | |
1005 | ||
1006 | if (nr_unlink) | |
1007 | printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); | |
1008 | if (nr_truncate) | |
1009 | printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); | |
1010 | ||
1011 | btrfs_free_path(path); | |
1012 | btrfs_end_transaction(trans, root); | |
1013 | } | |
1014 | ||
39279cc3 CM |
1015 | void btrfs_read_locked_inode(struct inode *inode) |
1016 | { | |
1017 | struct btrfs_path *path; | |
5f39d397 | 1018 | struct extent_buffer *leaf; |
39279cc3 | 1019 | struct btrfs_inode_item *inode_item; |
0b86a832 | 1020 | struct btrfs_timespec *tspec; |
39279cc3 CM |
1021 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1022 | struct btrfs_key location; | |
1023 | u64 alloc_group_block; | |
618e21d5 | 1024 | u32 rdev; |
39279cc3 CM |
1025 | int ret; |
1026 | ||
1027 | path = btrfs_alloc_path(); | |
1028 | BUG_ON(!path); | |
39279cc3 | 1029 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 1030 | |
39279cc3 | 1031 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 1032 | if (ret) |
39279cc3 | 1033 | goto make_bad; |
39279cc3 | 1034 | |
5f39d397 CM |
1035 | leaf = path->nodes[0]; |
1036 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
1037 | struct btrfs_inode_item); | |
1038 | ||
1039 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
1040 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
1041 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
1042 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
dbe674a9 | 1043 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 CM |
1044 | |
1045 | tspec = btrfs_inode_atime(inode_item); | |
1046 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
1047 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
1048 | ||
1049 | tspec = btrfs_inode_mtime(inode_item); | |
1050 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
1051 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
1052 | ||
1053 | tspec = btrfs_inode_ctime(inode_item); | |
1054 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
1055 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
1056 | ||
1057 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
1058 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 1059 | inode->i_rdev = 0; |
5f39d397 CM |
1060 | rdev = btrfs_inode_rdev(leaf, inode_item); |
1061 | ||
aec7477b JB |
1062 | BTRFS_I(inode)->index_cnt = (u64)-1; |
1063 | ||
5f39d397 | 1064 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); |
39279cc3 CM |
1065 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
1066 | alloc_group_block); | |
b98b6767 | 1067 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
1068 | if (!BTRFS_I(inode)->block_group) { |
1069 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
0b86a832 CM |
1070 | NULL, 0, |
1071 | BTRFS_BLOCK_GROUP_METADATA, 0); | |
e52ec0eb | 1072 | } |
39279cc3 CM |
1073 | btrfs_free_path(path); |
1074 | inode_item = NULL; | |
1075 | ||
39279cc3 | 1076 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
1077 | case S_IFREG: |
1078 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 1079 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 1080 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1081 | inode->i_fop = &btrfs_file_operations; |
1082 | inode->i_op = &btrfs_file_inode_operations; | |
1083 | break; | |
1084 | case S_IFDIR: | |
1085 | inode->i_fop = &btrfs_dir_file_operations; | |
1086 | if (root == root->fs_info->tree_root) | |
1087 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
1088 | else | |
1089 | inode->i_op = &btrfs_dir_inode_operations; | |
1090 | break; | |
1091 | case S_IFLNK: | |
1092 | inode->i_op = &btrfs_symlink_inode_operations; | |
1093 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 1094 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 1095 | break; |
618e21d5 JB |
1096 | default: |
1097 | init_special_inode(inode, inode->i_mode, rdev); | |
1098 | break; | |
39279cc3 CM |
1099 | } |
1100 | return; | |
1101 | ||
1102 | make_bad: | |
39279cc3 | 1103 | btrfs_free_path(path); |
39279cc3 CM |
1104 | make_bad_inode(inode); |
1105 | } | |
1106 | ||
5f39d397 CM |
1107 | static void fill_inode_item(struct extent_buffer *leaf, |
1108 | struct btrfs_inode_item *item, | |
39279cc3 CM |
1109 | struct inode *inode) |
1110 | { | |
5f39d397 CM |
1111 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
1112 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
dbe674a9 | 1113 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
5f39d397 CM |
1114 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
1115 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
1116 | ||
1117 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
1118 | inode->i_atime.tv_sec); | |
1119 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
1120 | inode->i_atime.tv_nsec); | |
1121 | ||
1122 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
1123 | inode->i_mtime.tv_sec); | |
1124 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
1125 | inode->i_mtime.tv_nsec); | |
1126 | ||
1127 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
1128 | inode->i_ctime.tv_sec); | |
1129 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
1130 | inode->i_ctime.tv_nsec); | |
1131 | ||
1132 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
1133 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
1134 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 1135 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 1136 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
1137 | BTRFS_I(inode)->block_group->key.objectid); |
1138 | } | |
1139 | ||
ba1da2f4 | 1140 | int noinline btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
1141 | struct btrfs_root *root, |
1142 | struct inode *inode) | |
1143 | { | |
1144 | struct btrfs_inode_item *inode_item; | |
1145 | struct btrfs_path *path; | |
5f39d397 | 1146 | struct extent_buffer *leaf; |
39279cc3 CM |
1147 | int ret; |
1148 | ||
1149 | path = btrfs_alloc_path(); | |
1150 | BUG_ON(!path); | |
39279cc3 CM |
1151 | ret = btrfs_lookup_inode(trans, root, path, |
1152 | &BTRFS_I(inode)->location, 1); | |
1153 | if (ret) { | |
1154 | if (ret > 0) | |
1155 | ret = -ENOENT; | |
1156 | goto failed; | |
1157 | } | |
1158 | ||
5f39d397 CM |
1159 | leaf = path->nodes[0]; |
1160 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
1161 | struct btrfs_inode_item); |
1162 | ||
5f39d397 CM |
1163 | fill_inode_item(leaf, inode_item, inode); |
1164 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 1165 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
1166 | ret = 0; |
1167 | failed: | |
39279cc3 CM |
1168 | btrfs_free_path(path); |
1169 | return ret; | |
1170 | } | |
1171 | ||
1172 | ||
1173 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
1174 | struct btrfs_root *root, | |
1175 | struct inode *dir, | |
1176 | struct dentry *dentry) | |
1177 | { | |
1178 | struct btrfs_path *path; | |
1179 | const char *name = dentry->d_name.name; | |
1180 | int name_len = dentry->d_name.len; | |
1181 | int ret = 0; | |
5f39d397 | 1182 | struct extent_buffer *leaf; |
39279cc3 | 1183 | struct btrfs_dir_item *di; |
5f39d397 | 1184 | struct btrfs_key key; |
aec7477b | 1185 | u64 index; |
39279cc3 CM |
1186 | |
1187 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
1188 | if (!path) { |
1189 | ret = -ENOMEM; | |
1190 | goto err; | |
1191 | } | |
1192 | ||
39279cc3 CM |
1193 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
1194 | name, name_len, -1); | |
1195 | if (IS_ERR(di)) { | |
1196 | ret = PTR_ERR(di); | |
1197 | goto err; | |
1198 | } | |
1199 | if (!di) { | |
1200 | ret = -ENOENT; | |
1201 | goto err; | |
1202 | } | |
5f39d397 CM |
1203 | leaf = path->nodes[0]; |
1204 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 1205 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
1206 | if (ret) |
1207 | goto err; | |
39279cc3 CM |
1208 | btrfs_release_path(root, path); |
1209 | ||
aec7477b JB |
1210 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
1211 | dentry->d_inode->i_ino, | |
1212 | dentry->d_parent->d_inode->i_ino, &index); | |
1213 | if (ret) { | |
1214 | printk("failed to delete reference to %.*s, " | |
1215 | "inode %lu parent %lu\n", name_len, name, | |
1216 | dentry->d_inode->i_ino, | |
1217 | dentry->d_parent->d_inode->i_ino); | |
1218 | goto err; | |
1219 | } | |
1220 | ||
39279cc3 | 1221 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
aec7477b | 1222 | index, name, name_len, -1); |
39279cc3 CM |
1223 | if (IS_ERR(di)) { |
1224 | ret = PTR_ERR(di); | |
1225 | goto err; | |
1226 | } | |
1227 | if (!di) { | |
1228 | ret = -ENOENT; | |
1229 | goto err; | |
1230 | } | |
1231 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
925baedd | 1232 | btrfs_release_path(root, path); |
39279cc3 CM |
1233 | |
1234 | dentry->d_inode->i_ctime = dir->i_ctime; | |
1235 | err: | |
1236 | btrfs_free_path(path); | |
1237 | if (!ret) { | |
dbe674a9 | 1238 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); |
79c44584 | 1239 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 1240 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
1241 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1242 | dentry->d_inode->i_nlink--; | |
1243 | #else | |
39279cc3 | 1244 | drop_nlink(dentry->d_inode); |
6da6abae | 1245 | #endif |
54aa1f4d | 1246 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
1247 | dir->i_sb->s_dirt = 1; |
1248 | } | |
1249 | return ret; | |
1250 | } | |
1251 | ||
1252 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
1253 | { | |
1254 | struct btrfs_root *root; | |
1255 | struct btrfs_trans_handle *trans; | |
7b128766 | 1256 | struct inode *inode = dentry->d_inode; |
39279cc3 | 1257 | int ret; |
1832a6d5 | 1258 | unsigned long nr = 0; |
39279cc3 CM |
1259 | |
1260 | root = BTRFS_I(dir)->root; | |
1832a6d5 CM |
1261 | |
1262 | ret = btrfs_check_free_space(root, 1, 1); | |
1263 | if (ret) | |
1264 | goto fail; | |
1265 | ||
39279cc3 | 1266 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1267 | |
39279cc3 CM |
1268 | btrfs_set_trans_block_group(trans, dir); |
1269 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
7b128766 JB |
1270 | |
1271 | if (inode->i_nlink == 0) | |
1272 | ret = btrfs_orphan_add(trans, inode); | |
1273 | ||
d3c2fdcf | 1274 | nr = trans->blocks_used; |
5f39d397 | 1275 | |
89ce8a63 | 1276 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 1277 | fail: |
d3c2fdcf | 1278 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1279 | return ret; |
1280 | } | |
1281 | ||
1282 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
1283 | { | |
1284 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 1285 | int err = 0; |
39279cc3 CM |
1286 | int ret; |
1287 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 1288 | struct btrfs_trans_handle *trans; |
1832a6d5 | 1289 | unsigned long nr = 0; |
39279cc3 | 1290 | |
925baedd | 1291 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) { |
134d4512 | 1292 | return -ENOTEMPTY; |
925baedd | 1293 | } |
134d4512 | 1294 | |
1832a6d5 CM |
1295 | ret = btrfs_check_free_space(root, 1, 1); |
1296 | if (ret) | |
1297 | goto fail; | |
1298 | ||
39279cc3 CM |
1299 | trans = btrfs_start_transaction(root, 1); |
1300 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 | 1301 | |
7b128766 JB |
1302 | err = btrfs_orphan_add(trans, inode); |
1303 | if (err) | |
1304 | goto fail_trans; | |
1305 | ||
39279cc3 CM |
1306 | /* now the directory is empty */ |
1307 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
1308 | if (!err) { | |
dbe674a9 | 1309 | btrfs_i_size_write(inode, 0); |
39279cc3 | 1310 | } |
3954401f | 1311 | |
7b128766 | 1312 | fail_trans: |
d3c2fdcf | 1313 | nr = trans->blocks_used; |
89ce8a63 | 1314 | ret = btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 1315 | fail: |
d3c2fdcf | 1316 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 1317 | |
39279cc3 CM |
1318 | if (ret && !err) |
1319 | err = ret; | |
1320 | return err; | |
1321 | } | |
1322 | ||
39279cc3 CM |
1323 | /* |
1324 | * this can truncate away extent items, csum items and directory items. | |
1325 | * It starts at a high offset and removes keys until it can't find | |
1326 | * any higher than i_size. | |
1327 | * | |
1328 | * csum items that cross the new i_size are truncated to the new size | |
1329 | * as well. | |
7b128766 JB |
1330 | * |
1331 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
1332 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 CM |
1333 | */ |
1334 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
1335 | struct btrfs_root *root, | |
85e21bac CM |
1336 | struct inode *inode, |
1337 | u32 min_type) | |
39279cc3 CM |
1338 | { |
1339 | int ret; | |
1340 | struct btrfs_path *path; | |
1341 | struct btrfs_key key; | |
5f39d397 | 1342 | struct btrfs_key found_key; |
39279cc3 | 1343 | u32 found_type; |
5f39d397 | 1344 | struct extent_buffer *leaf; |
39279cc3 CM |
1345 | struct btrfs_file_extent_item *fi; |
1346 | u64 extent_start = 0; | |
db94535d | 1347 | u64 extent_num_bytes = 0; |
39279cc3 | 1348 | u64 item_end = 0; |
7bb86316 | 1349 | u64 root_gen = 0; |
d8d5f3e1 | 1350 | u64 root_owner = 0; |
39279cc3 CM |
1351 | int found_extent; |
1352 | int del_item; | |
85e21bac CM |
1353 | int pending_del_nr = 0; |
1354 | int pending_del_slot = 0; | |
179e29e4 | 1355 | int extent_type = -1; |
3b951516 | 1356 | u64 mask = root->sectorsize - 1; |
39279cc3 | 1357 | |
3b951516 | 1358 | btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1); |
39279cc3 | 1359 | path = btrfs_alloc_path(); |
3c69faec | 1360 | path->reada = -1; |
39279cc3 | 1361 | BUG_ON(!path); |
5f39d397 | 1362 | |
39279cc3 CM |
1363 | /* FIXME, add redo link to tree so we don't leak on crash */ |
1364 | key.objectid = inode->i_ino; | |
1365 | key.offset = (u64)-1; | |
5f39d397 CM |
1366 | key.type = (u8)-1; |
1367 | ||
85e21bac CM |
1368 | btrfs_init_path(path); |
1369 | search_again: | |
1370 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1371 | if (ret < 0) { | |
1372 | goto error; | |
1373 | } | |
1374 | if (ret > 0) { | |
1375 | BUG_ON(path->slots[0] == 0); | |
1376 | path->slots[0]--; | |
1377 | } | |
1378 | ||
39279cc3 | 1379 | while(1) { |
39279cc3 | 1380 | fi = NULL; |
5f39d397 CM |
1381 | leaf = path->nodes[0]; |
1382 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1383 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 1384 | |
5f39d397 | 1385 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 1386 | break; |
5f39d397 | 1387 | |
85e21bac | 1388 | if (found_type < min_type) |
39279cc3 CM |
1389 | break; |
1390 | ||
5f39d397 | 1391 | item_end = found_key.offset; |
39279cc3 | 1392 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 1393 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 1394 | struct btrfs_file_extent_item); |
179e29e4 CM |
1395 | extent_type = btrfs_file_extent_type(leaf, fi); |
1396 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1397 | item_end += |
db94535d | 1398 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
1399 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1400 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
1401 | path->slots[0]); | |
1402 | item_end += btrfs_file_extent_inline_len(leaf, | |
1403 | item); | |
39279cc3 | 1404 | } |
008630c1 | 1405 | item_end--; |
39279cc3 CM |
1406 | } |
1407 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
1408 | ret = btrfs_csum_truncate(trans, root, path, | |
1409 | inode->i_size); | |
1410 | BUG_ON(ret); | |
1411 | } | |
008630c1 | 1412 | if (item_end < inode->i_size) { |
b888db2b CM |
1413 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
1414 | found_type = BTRFS_INODE_ITEM_KEY; | |
1415 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
1416 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
1417 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
1418 | found_type = BTRFS_XATTR_ITEM_KEY; | |
1419 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
1420 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
1421 | } else if (found_type) { |
1422 | found_type--; | |
1423 | } else { | |
1424 | break; | |
39279cc3 | 1425 | } |
a61721d5 | 1426 | btrfs_set_key_type(&key, found_type); |
85e21bac | 1427 | goto next; |
39279cc3 | 1428 | } |
5f39d397 | 1429 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
1430 | del_item = 1; |
1431 | else | |
1432 | del_item = 0; | |
1433 | found_extent = 0; | |
1434 | ||
1435 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
1436 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
1437 | goto delete; | |
1438 | ||
1439 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 1440 | u64 num_dec; |
db94535d | 1441 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 1442 | if (!del_item) { |
db94535d CM |
1443 | u64 orig_num_bytes = |
1444 | btrfs_file_extent_num_bytes(leaf, fi); | |
1445 | extent_num_bytes = inode->i_size - | |
5f39d397 | 1446 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
1447 | extent_num_bytes = extent_num_bytes & |
1448 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
1449 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1450 | extent_num_bytes); | |
1451 | num_dec = (orig_num_bytes - | |
9069218d CM |
1452 | extent_num_bytes); |
1453 | if (extent_start != 0) | |
1454 | dec_i_blocks(inode, num_dec); | |
5f39d397 | 1455 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 1456 | } else { |
db94535d CM |
1457 | extent_num_bytes = |
1458 | btrfs_file_extent_disk_num_bytes(leaf, | |
1459 | fi); | |
39279cc3 | 1460 | /* FIXME blocksize != 4096 */ |
9069218d | 1461 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
1462 | if (extent_start != 0) { |
1463 | found_extent = 1; | |
9069218d | 1464 | dec_i_blocks(inode, num_dec); |
39279cc3 | 1465 | } |
d8d5f3e1 CM |
1466 | root_gen = btrfs_header_generation(leaf); |
1467 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 1468 | } |
9069218d CM |
1469 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1470 | if (!del_item) { | |
1471 | u32 newsize = inode->i_size - found_key.offset; | |
1472 | dec_i_blocks(inode, item_end + 1 - | |
1473 | found_key.offset - newsize); | |
1474 | newsize = | |
1475 | btrfs_file_extent_calc_inline_size(newsize); | |
1476 | ret = btrfs_truncate_item(trans, root, path, | |
1477 | newsize, 1); | |
1478 | BUG_ON(ret); | |
1479 | } else { | |
1480 | dec_i_blocks(inode, item_end + 1 - | |
1481 | found_key.offset); | |
1482 | } | |
39279cc3 | 1483 | } |
179e29e4 | 1484 | delete: |
39279cc3 | 1485 | if (del_item) { |
85e21bac CM |
1486 | if (!pending_del_nr) { |
1487 | /* no pending yet, add ourselves */ | |
1488 | pending_del_slot = path->slots[0]; | |
1489 | pending_del_nr = 1; | |
1490 | } else if (pending_del_nr && | |
1491 | path->slots[0] + 1 == pending_del_slot) { | |
1492 | /* hop on the pending chunk */ | |
1493 | pending_del_nr++; | |
1494 | pending_del_slot = path->slots[0]; | |
1495 | } else { | |
1496 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
1497 | } | |
39279cc3 CM |
1498 | } else { |
1499 | break; | |
1500 | } | |
39279cc3 CM |
1501 | if (found_extent) { |
1502 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 1503 | extent_num_bytes, |
d8d5f3e1 | 1504 | root_owner, |
7bb86316 CM |
1505 | root_gen, inode->i_ino, |
1506 | found_key.offset, 0); | |
39279cc3 CM |
1507 | BUG_ON(ret); |
1508 | } | |
85e21bac CM |
1509 | next: |
1510 | if (path->slots[0] == 0) { | |
1511 | if (pending_del_nr) | |
1512 | goto del_pending; | |
1513 | btrfs_release_path(root, path); | |
1514 | goto search_again; | |
1515 | } | |
1516 | ||
1517 | path->slots[0]--; | |
1518 | if (pending_del_nr && | |
1519 | path->slots[0] + 1 != pending_del_slot) { | |
1520 | struct btrfs_key debug; | |
1521 | del_pending: | |
1522 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
1523 | pending_del_slot); | |
1524 | ret = btrfs_del_items(trans, root, path, | |
1525 | pending_del_slot, | |
1526 | pending_del_nr); | |
1527 | BUG_ON(ret); | |
1528 | pending_del_nr = 0; | |
1529 | btrfs_release_path(root, path); | |
1530 | goto search_again; | |
1531 | } | |
39279cc3 CM |
1532 | } |
1533 | ret = 0; | |
1534 | error: | |
85e21bac CM |
1535 | if (pending_del_nr) { |
1536 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
1537 | pending_del_nr); | |
1538 | } | |
39279cc3 CM |
1539 | btrfs_free_path(path); |
1540 | inode->i_sb->s_dirt = 1; | |
1541 | return ret; | |
1542 | } | |
1543 | ||
1544 | /* | |
1545 | * taken from block_truncate_page, but does cow as it zeros out | |
1546 | * any bytes left in the last page in the file. | |
1547 | */ | |
1548 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
1549 | { | |
1550 | struct inode *inode = mapping->host; | |
db94535d | 1551 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
1552 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
1553 | struct btrfs_ordered_extent *ordered; | |
1554 | char *kaddr; | |
db94535d | 1555 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
1556 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
1557 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
1558 | struct page *page; | |
39279cc3 | 1559 | int ret = 0; |
a52d9a80 | 1560 | u64 page_start; |
e6dcd2dc | 1561 | u64 page_end; |
39279cc3 CM |
1562 | |
1563 | if ((offset & (blocksize - 1)) == 0) | |
1564 | goto out; | |
1565 | ||
1566 | ret = -ENOMEM; | |
211c17f5 | 1567 | again: |
39279cc3 CM |
1568 | page = grab_cache_page(mapping, index); |
1569 | if (!page) | |
1570 | goto out; | |
e6dcd2dc CM |
1571 | |
1572 | page_start = page_offset(page); | |
1573 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1574 | ||
39279cc3 | 1575 | if (!PageUptodate(page)) { |
9ebefb18 | 1576 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 1577 | lock_page(page); |
211c17f5 CM |
1578 | if (page->mapping != mapping) { |
1579 | unlock_page(page); | |
1580 | page_cache_release(page); | |
1581 | goto again; | |
1582 | } | |
39279cc3 CM |
1583 | if (!PageUptodate(page)) { |
1584 | ret = -EIO; | |
89642229 | 1585 | goto out_unlock; |
39279cc3 CM |
1586 | } |
1587 | } | |
211c17f5 | 1588 | wait_on_page_writeback(page); |
e6dcd2dc CM |
1589 | |
1590 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
1591 | set_page_extent_mapped(page); | |
1592 | ||
1593 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
1594 | if (ordered) { | |
1595 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
1596 | unlock_page(page); | |
1597 | page_cache_release(page); | |
eb84ae03 | 1598 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
1599 | btrfs_put_ordered_extent(ordered); |
1600 | goto again; | |
1601 | } | |
1602 | ||
1603 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, | |
1604 | page_end, GFP_NOFS); | |
1605 | ret = 0; | |
1606 | if (offset != PAGE_CACHE_SIZE) { | |
1607 | kaddr = kmap(page); | |
1608 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1609 | flush_dcache_page(page); | |
1610 | kunmap(page); | |
1611 | } | |
247e743c | 1612 | ClearPageChecked(page); |
e6dcd2dc CM |
1613 | set_page_dirty(page); |
1614 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
39279cc3 | 1615 | |
89642229 | 1616 | out_unlock: |
39279cc3 CM |
1617 | unlock_page(page); |
1618 | page_cache_release(page); | |
1619 | out: | |
1620 | return ret; | |
1621 | } | |
1622 | ||
1623 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1624 | { | |
1625 | struct inode *inode = dentry->d_inode; | |
1626 | int err; | |
1627 | ||
1628 | err = inode_change_ok(inode, attr); | |
1629 | if (err) | |
1630 | return err; | |
1631 | ||
1632 | if (S_ISREG(inode->i_mode) && | |
1633 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1634 | struct btrfs_trans_handle *trans; | |
1635 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1636 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1637 | |
5f39d397 | 1638 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1639 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1640 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1641 | u64 hole_size; |
179e29e4 | 1642 | u64 alloc_hint = 0; |
39279cc3 | 1643 | |
1b0f7c29 | 1644 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1645 | goto out; |
1646 | ||
1832a6d5 | 1647 | err = btrfs_check_free_space(root, 1, 0); |
1832a6d5 CM |
1648 | if (err) |
1649 | goto fail; | |
1650 | ||
39279cc3 CM |
1651 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1652 | ||
5f56406a | 1653 | hole_size = block_end - hole_start; |
e6dcd2dc CM |
1654 | btrfs_wait_ordered_range(inode, hole_start, hole_size); |
1655 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); | |
39279cc3 | 1656 | |
39279cc3 CM |
1657 | trans = btrfs_start_transaction(root, 1); |
1658 | btrfs_set_trans_block_group(trans, inode); | |
ee6e6504 | 1659 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
2bf5a725 | 1660 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1661 | hole_start, block_end, hole_start, |
3326d1b0 | 1662 | &alloc_hint); |
2bf5a725 | 1663 | |
179e29e4 CM |
1664 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1665 | err = btrfs_insert_file_extent(trans, root, | |
1666 | inode->i_ino, | |
5f56406a | 1667 | hole_start, 0, 0, |
f2eb0a24 | 1668 | hole_size, 0); |
d1310b2e | 1669 | btrfs_drop_extent_cache(inode, hole_start, |
3b951516 | 1670 | (u64)-1); |
5f56406a | 1671 | btrfs_check_file(root, inode); |
179e29e4 | 1672 | } |
ee6e6504 | 1673 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
39279cc3 | 1674 | btrfs_end_transaction(trans, root); |
1b0f7c29 | 1675 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1676 | if (err) |
1677 | return err; | |
39279cc3 CM |
1678 | } |
1679 | out: | |
1680 | err = inode_setattr(inode, attr); | |
33268eaf JB |
1681 | |
1682 | if (!err && ((attr->ia_valid & ATTR_MODE))) | |
1683 | err = btrfs_acl_chmod(inode); | |
1832a6d5 | 1684 | fail: |
39279cc3 CM |
1685 | return err; |
1686 | } | |
61295eb8 | 1687 | |
39279cc3 CM |
1688 | void btrfs_delete_inode(struct inode *inode) |
1689 | { | |
1690 | struct btrfs_trans_handle *trans; | |
1691 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1692 | unsigned long nr; |
39279cc3 CM |
1693 | int ret; |
1694 | ||
1695 | truncate_inode_pages(&inode->i_data, 0); | |
1696 | if (is_bad_inode(inode)) { | |
7b128766 | 1697 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
1698 | goto no_delete; |
1699 | } | |
4a096752 | 1700 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
5f39d397 | 1701 | |
dbe674a9 | 1702 | btrfs_i_size_write(inode, 0); |
39279cc3 | 1703 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1704 | |
39279cc3 | 1705 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1706 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
7b128766 JB |
1707 | if (ret) { |
1708 | btrfs_orphan_del(NULL, inode); | |
54aa1f4d | 1709 | goto no_delete_lock; |
7b128766 JB |
1710 | } |
1711 | ||
1712 | btrfs_orphan_del(trans, inode); | |
85e21bac | 1713 | |
d3c2fdcf | 1714 | nr = trans->blocks_used; |
85e21bac | 1715 | clear_inode(inode); |
5f39d397 | 1716 | |
39279cc3 | 1717 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1718 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 1719 | return; |
54aa1f4d CM |
1720 | |
1721 | no_delete_lock: | |
d3c2fdcf | 1722 | nr = trans->blocks_used; |
54aa1f4d | 1723 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1724 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1725 | no_delete: |
1726 | clear_inode(inode); | |
1727 | } | |
1728 | ||
1729 | /* | |
1730 | * this returns the key found in the dir entry in the location pointer. | |
1731 | * If no dir entries were found, location->objectid is 0. | |
1732 | */ | |
1733 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1734 | struct btrfs_key *location) | |
1735 | { | |
1736 | const char *name = dentry->d_name.name; | |
1737 | int namelen = dentry->d_name.len; | |
1738 | struct btrfs_dir_item *di; | |
1739 | struct btrfs_path *path; | |
1740 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1741 | int ret = 0; |
39279cc3 | 1742 | |
3954401f CM |
1743 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1744 | location->objectid = dir->i_ino; | |
1745 | location->type = BTRFS_INODE_ITEM_KEY; | |
1746 | location->offset = 0; | |
1747 | return 0; | |
1748 | } | |
39279cc3 CM |
1749 | path = btrfs_alloc_path(); |
1750 | BUG_ON(!path); | |
3954401f | 1751 | |
7a720536 | 1752 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1753 | struct btrfs_key key; |
1754 | struct extent_buffer *leaf; | |
1755 | u32 nritems; | |
1756 | int slot; | |
1757 | ||
1758 | key.objectid = dir->i_ino; | |
1759 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1760 | key.offset = 0; | |
1761 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1762 | BUG_ON(ret == 0); | |
1763 | ret = 0; | |
1764 | ||
1765 | leaf = path->nodes[0]; | |
1766 | slot = path->slots[0]; | |
1767 | nritems = btrfs_header_nritems(leaf); | |
1768 | if (slot >= nritems) | |
1769 | goto out_err; | |
1770 | ||
1771 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1772 | if (key.objectid != dir->i_ino || | |
1773 | key.type != BTRFS_INODE_REF_KEY) { | |
1774 | goto out_err; | |
1775 | } | |
1776 | location->objectid = key.offset; | |
1777 | location->type = BTRFS_INODE_ITEM_KEY; | |
1778 | location->offset = 0; | |
1779 | goto out; | |
1780 | } | |
1781 | ||
39279cc3 CM |
1782 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1783 | namelen, 0); | |
0d9f7f3e Y |
1784 | if (IS_ERR(di)) |
1785 | ret = PTR_ERR(di); | |
39279cc3 | 1786 | if (!di || IS_ERR(di)) { |
3954401f | 1787 | goto out_err; |
39279cc3 | 1788 | } |
5f39d397 | 1789 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1790 | out: |
39279cc3 CM |
1791 | btrfs_free_path(path); |
1792 | return ret; | |
3954401f CM |
1793 | out_err: |
1794 | location->objectid = 0; | |
1795 | goto out; | |
39279cc3 CM |
1796 | } |
1797 | ||
1798 | /* | |
1799 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1800 | * needs to be changed to reflect the root directory of the tree root. This | |
1801 | * is kind of like crossing a mount point. | |
1802 | */ | |
1803 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1804 | struct btrfs_key *location, | |
58176a96 JB |
1805 | struct btrfs_root **sub_root, |
1806 | struct dentry *dentry) | |
39279cc3 | 1807 | { |
39279cc3 CM |
1808 | struct btrfs_root_item *ri; |
1809 | ||
1810 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1811 | return 0; | |
1812 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1813 | return 0; | |
1814 | ||
58176a96 JB |
1815 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1816 | dentry->d_name.name, | |
1817 | dentry->d_name.len); | |
39279cc3 CM |
1818 | if (IS_ERR(*sub_root)) |
1819 | return PTR_ERR(*sub_root); | |
1820 | ||
1821 | ri = &(*sub_root)->root_item; | |
1822 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1823 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1824 | location->offset = 0; | |
1825 | ||
39279cc3 CM |
1826 | return 0; |
1827 | } | |
1828 | ||
1829 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1830 | { | |
1831 | struct btrfs_iget_args *args = p; | |
1832 | inode->i_ino = args->ino; | |
1833 | BTRFS_I(inode)->root = args->root; | |
9069218d | 1834 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 1835 | BTRFS_I(inode)->disk_i_size = 0; |
aec7477b | 1836 | BTRFS_I(inode)->index_cnt = (u64)-1; |
d1310b2e CM |
1837 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1838 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1839 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1840 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1841 | inode->i_mapping, GFP_NOFS); | |
ba1da2f4 | 1842 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
1b1e2135 | 1843 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 1844 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
39279cc3 CM |
1845 | return 0; |
1846 | } | |
1847 | ||
1848 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1849 | { | |
1850 | struct btrfs_iget_args *args = opaque; | |
1851 | return (args->ino == inode->i_ino && | |
1852 | args->root == BTRFS_I(inode)->root); | |
1853 | } | |
1854 | ||
dc17ff8f CM |
1855 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1856 | u64 root_objectid) | |
1857 | { | |
1858 | struct btrfs_iget_args args; | |
1859 | args.ino = objectid; | |
1860 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1861 | ||
1862 | if (!args.root) | |
1863 | return NULL; | |
1864 | ||
1865 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1866 | } | |
1867 | ||
39279cc3 CM |
1868 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1869 | struct btrfs_root *root) | |
1870 | { | |
1871 | struct inode *inode; | |
1872 | struct btrfs_iget_args args; | |
1873 | args.ino = objectid; | |
1874 | args.root = root; | |
1875 | ||
1876 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1877 | btrfs_init_locked_inode, | |
1878 | (void *)&args); | |
1879 | return inode; | |
1880 | } | |
1881 | ||
1882 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, | |
1883 | struct nameidata *nd) | |
1884 | { | |
1885 | struct inode * inode; | |
1886 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1887 | struct btrfs_root *root = bi->root; | |
1888 | struct btrfs_root *sub_root = root; | |
1889 | struct btrfs_key location; | |
7b128766 | 1890 | int ret, do_orphan = 0; |
39279cc3 CM |
1891 | |
1892 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1893 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1894 | |
39279cc3 | 1895 | ret = btrfs_inode_by_name(dir, dentry, &location); |
5f39d397 | 1896 | |
39279cc3 CM |
1897 | if (ret < 0) |
1898 | return ERR_PTR(ret); | |
5f39d397 | 1899 | |
39279cc3 CM |
1900 | inode = NULL; |
1901 | if (location.objectid) { | |
58176a96 JB |
1902 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1903 | dentry); | |
39279cc3 CM |
1904 | if (ret < 0) |
1905 | return ERR_PTR(ret); | |
1906 | if (ret > 0) | |
1907 | return ERR_PTR(-ENOENT); | |
7b128766 | 1908 | |
39279cc3 CM |
1909 | inode = btrfs_iget_locked(dir->i_sb, location.objectid, |
1910 | sub_root); | |
1911 | if (!inode) | |
1912 | return ERR_PTR(-EACCES); | |
1913 | if (inode->i_state & I_NEW) { | |
1914 | /* the inode and parent dir are two different roots */ | |
1915 | if (sub_root != root) { | |
1916 | igrab(inode); | |
1917 | sub_root->inode = inode; | |
7b128766 | 1918 | do_orphan = 1; |
39279cc3 CM |
1919 | } |
1920 | BTRFS_I(inode)->root = sub_root; | |
1921 | memcpy(&BTRFS_I(inode)->location, &location, | |
1922 | sizeof(location)); | |
1923 | btrfs_read_locked_inode(inode); | |
1924 | unlock_new_inode(inode); | |
1925 | } | |
1926 | } | |
7b128766 JB |
1927 | |
1928 | if (unlikely(do_orphan)) | |
1929 | btrfs_orphan_cleanup(sub_root); | |
1930 | ||
39279cc3 CM |
1931 | return d_splice_alias(inode, dentry); |
1932 | } | |
1933 | ||
39279cc3 CM |
1934 | static unsigned char btrfs_filetype_table[] = { |
1935 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1936 | }; | |
1937 | ||
1938 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1939 | { | |
6da6abae | 1940 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1941 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1942 | struct btrfs_item *item; | |
1943 | struct btrfs_dir_item *di; | |
1944 | struct btrfs_key key; | |
5f39d397 | 1945 | struct btrfs_key found_key; |
39279cc3 CM |
1946 | struct btrfs_path *path; |
1947 | int ret; | |
1948 | u32 nritems; | |
5f39d397 | 1949 | struct extent_buffer *leaf; |
39279cc3 CM |
1950 | int slot; |
1951 | int advance; | |
1952 | unsigned char d_type; | |
1953 | int over = 0; | |
1954 | u32 di_cur; | |
1955 | u32 di_total; | |
1956 | u32 di_len; | |
1957 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1958 | char tmp_name[32]; |
1959 | char *name_ptr; | |
1960 | int name_len; | |
39279cc3 CM |
1961 | |
1962 | /* FIXME, use a real flag for deciding about the key type */ | |
1963 | if (root->fs_info->tree_root == root) | |
1964 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1965 | |
3954401f CM |
1966 | /* special case for "." */ |
1967 | if (filp->f_pos == 0) { | |
1968 | over = filldir(dirent, ".", 1, | |
1969 | 1, inode->i_ino, | |
1970 | DT_DIR); | |
1971 | if (over) | |
1972 | return 0; | |
1973 | filp->f_pos = 1; | |
1974 | } | |
1975 | ||
39279cc3 | 1976 | key.objectid = inode->i_ino; |
3954401f CM |
1977 | path = btrfs_alloc_path(); |
1978 | path->reada = 2; | |
1979 | ||
1980 | /* special case for .., just use the back ref */ | |
1981 | if (filp->f_pos == 1) { | |
1982 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
1983 | key.offset = 0; | |
1984 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1985 | BUG_ON(ret == 0); | |
1986 | leaf = path->nodes[0]; | |
1987 | slot = path->slots[0]; | |
1988 | nritems = btrfs_header_nritems(leaf); | |
1989 | if (slot >= nritems) { | |
1990 | btrfs_release_path(root, path); | |
1991 | goto read_dir_items; | |
1992 | } | |
1993 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
1994 | btrfs_release_path(root, path); | |
1995 | if (found_key.objectid != key.objectid || | |
1996 | found_key.type != BTRFS_INODE_REF_KEY) | |
1997 | goto read_dir_items; | |
1998 | over = filldir(dirent, "..", 2, | |
1999 | 2, found_key.offset, DT_DIR); | |
2000 | if (over) | |
2001 | goto nopos; | |
2002 | filp->f_pos = 2; | |
2003 | } | |
2004 | ||
2005 | read_dir_items: | |
39279cc3 CM |
2006 | btrfs_set_key_type(&key, key_type); |
2007 | key.offset = filp->f_pos; | |
5f39d397 | 2008 | |
39279cc3 CM |
2009 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
2010 | if (ret < 0) | |
2011 | goto err; | |
2012 | advance = 0; | |
39279cc3 | 2013 | while(1) { |
5f39d397 CM |
2014 | leaf = path->nodes[0]; |
2015 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
2016 | slot = path->slots[0]; |
2017 | if (advance || slot >= nritems) { | |
2018 | if (slot >= nritems -1) { | |
39279cc3 CM |
2019 | ret = btrfs_next_leaf(root, path); |
2020 | if (ret) | |
2021 | break; | |
5f39d397 CM |
2022 | leaf = path->nodes[0]; |
2023 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
2024 | slot = path->slots[0]; |
2025 | } else { | |
2026 | slot++; | |
2027 | path->slots[0]++; | |
2028 | } | |
2029 | } | |
2030 | advance = 1; | |
5f39d397 CM |
2031 | item = btrfs_item_nr(leaf, slot); |
2032 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2033 | ||
2034 | if (found_key.objectid != key.objectid) | |
39279cc3 | 2035 | break; |
5f39d397 | 2036 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 2037 | break; |
5f39d397 | 2038 | if (found_key.offset < filp->f_pos) |
39279cc3 | 2039 | continue; |
5f39d397 CM |
2040 | |
2041 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
2042 | advance = 1; |
2043 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
2044 | di_cur = 0; | |
5f39d397 | 2045 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 2046 | while(di_cur < di_total) { |
5f39d397 CM |
2047 | struct btrfs_key location; |
2048 | ||
2049 | name_len = btrfs_dir_name_len(leaf, di); | |
2050 | if (name_len < 32) { | |
2051 | name_ptr = tmp_name; | |
2052 | } else { | |
2053 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
2054 | BUG_ON(!name_ptr); | |
2055 | } | |
2056 | read_extent_buffer(leaf, name_ptr, | |
2057 | (unsigned long)(di + 1), name_len); | |
2058 | ||
2059 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
2060 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
2061 | over = filldir(dirent, name_ptr, name_len, |
2062 | found_key.offset, | |
2063 | location.objectid, | |
39279cc3 | 2064 | d_type); |
5f39d397 CM |
2065 | |
2066 | if (name_ptr != tmp_name) | |
2067 | kfree(name_ptr); | |
2068 | ||
39279cc3 CM |
2069 | if (over) |
2070 | goto nopos; | |
5103e947 JB |
2071 | di_len = btrfs_dir_name_len(leaf, di) + |
2072 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
2073 | di_cur += di_len; |
2074 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
2075 | } | |
2076 | } | |
5e591a07 YZ |
2077 | if (key_type == BTRFS_DIR_INDEX_KEY) |
2078 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
2079 | else | |
2080 | filp->f_pos++; | |
39279cc3 CM |
2081 | nopos: |
2082 | ret = 0; | |
2083 | err: | |
39279cc3 | 2084 | btrfs_free_path(path); |
39279cc3 CM |
2085 | return ret; |
2086 | } | |
2087 | ||
2088 | int btrfs_write_inode(struct inode *inode, int wait) | |
2089 | { | |
2090 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2091 | struct btrfs_trans_handle *trans; | |
2092 | int ret = 0; | |
2093 | ||
2094 | if (wait) { | |
f9295749 | 2095 | trans = btrfs_join_transaction(root, 1); |
39279cc3 CM |
2096 | btrfs_set_trans_block_group(trans, inode); |
2097 | ret = btrfs_commit_transaction(trans, root); | |
39279cc3 CM |
2098 | } |
2099 | return ret; | |
2100 | } | |
2101 | ||
2102 | /* | |
54aa1f4d | 2103 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
2104 | * inode changes. But, it is most likely to find the inode in cache. |
2105 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
2106 | * to keep or drop this code. | |
2107 | */ | |
2108 | void btrfs_dirty_inode(struct inode *inode) | |
2109 | { | |
2110 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2111 | struct btrfs_trans_handle *trans; | |
2112 | ||
f9295749 | 2113 | trans = btrfs_join_transaction(root, 1); |
39279cc3 CM |
2114 | btrfs_set_trans_block_group(trans, inode); |
2115 | btrfs_update_inode(trans, root, inode); | |
2116 | btrfs_end_transaction(trans, root); | |
39279cc3 CM |
2117 | } |
2118 | ||
aec7477b JB |
2119 | static int btrfs_set_inode_index_count(struct inode *inode) |
2120 | { | |
2121 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2122 | struct btrfs_key key, found_key; | |
2123 | struct btrfs_path *path; | |
2124 | struct extent_buffer *leaf; | |
2125 | int ret; | |
2126 | ||
2127 | key.objectid = inode->i_ino; | |
2128 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); | |
2129 | key.offset = (u64)-1; | |
2130 | ||
2131 | path = btrfs_alloc_path(); | |
2132 | if (!path) | |
2133 | return -ENOMEM; | |
2134 | ||
2135 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2136 | if (ret < 0) | |
2137 | goto out; | |
2138 | /* FIXME: we should be able to handle this */ | |
2139 | if (ret == 0) | |
2140 | goto out; | |
2141 | ret = 0; | |
2142 | ||
2143 | /* | |
2144 | * MAGIC NUMBER EXPLANATION: | |
2145 | * since we search a directory based on f_pos we have to start at 2 | |
2146 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
2147 | * else has to start at 2 | |
2148 | */ | |
2149 | if (path->slots[0] == 0) { | |
2150 | BTRFS_I(inode)->index_cnt = 2; | |
2151 | goto out; | |
2152 | } | |
2153 | ||
2154 | path->slots[0]--; | |
2155 | ||
2156 | leaf = path->nodes[0]; | |
2157 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2158 | ||
2159 | if (found_key.objectid != inode->i_ino || | |
2160 | btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) { | |
2161 | BTRFS_I(inode)->index_cnt = 2; | |
2162 | goto out; | |
2163 | } | |
2164 | ||
2165 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
2166 | out: | |
2167 | btrfs_free_path(path); | |
2168 | return ret; | |
2169 | } | |
2170 | ||
2171 | static int btrfs_set_inode_index(struct inode *dir, struct inode *inode) | |
2172 | { | |
2173 | int ret = 0; | |
2174 | ||
2175 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
2176 | ret = btrfs_set_inode_index_count(dir); | |
2177 | if (ret) | |
2178 | return ret; | |
2179 | } | |
2180 | ||
2181 | BTRFS_I(inode)->index = BTRFS_I(dir)->index_cnt; | |
2182 | BTRFS_I(dir)->index_cnt++; | |
2183 | ||
2184 | return ret; | |
2185 | } | |
2186 | ||
39279cc3 CM |
2187 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2188 | struct btrfs_root *root, | |
aec7477b | 2189 | struct inode *dir, |
9c58309d CM |
2190 | const char *name, int name_len, |
2191 | u64 ref_objectid, | |
39279cc3 CM |
2192 | u64 objectid, |
2193 | struct btrfs_block_group_cache *group, | |
2194 | int mode) | |
2195 | { | |
2196 | struct inode *inode; | |
5f39d397 | 2197 | struct btrfs_inode_item *inode_item; |
6324fbf3 | 2198 | struct btrfs_block_group_cache *new_inode_group; |
39279cc3 | 2199 | struct btrfs_key *location; |
5f39d397 | 2200 | struct btrfs_path *path; |
9c58309d CM |
2201 | struct btrfs_inode_ref *ref; |
2202 | struct btrfs_key key[2]; | |
2203 | u32 sizes[2]; | |
2204 | unsigned long ptr; | |
39279cc3 CM |
2205 | int ret; |
2206 | int owner; | |
2207 | ||
5f39d397 CM |
2208 | path = btrfs_alloc_path(); |
2209 | BUG_ON(!path); | |
2210 | ||
39279cc3 CM |
2211 | inode = new_inode(root->fs_info->sb); |
2212 | if (!inode) | |
2213 | return ERR_PTR(-ENOMEM); | |
2214 | ||
aec7477b JB |
2215 | if (dir) { |
2216 | ret = btrfs_set_inode_index(dir, inode); | |
2217 | if (ret) | |
2218 | return ERR_PTR(ret); | |
2219 | } else { | |
2220 | BTRFS_I(inode)->index = 0; | |
2221 | } | |
2222 | /* | |
2223 | * index_cnt is ignored for everything but a dir, | |
2224 | * btrfs_get_inode_index_count has an explanation for the magic | |
2225 | * number | |
2226 | */ | |
2227 | BTRFS_I(inode)->index_cnt = 2; | |
2228 | ||
d1310b2e CM |
2229 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2230 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 2231 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
2232 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
2233 | inode->i_mapping, GFP_NOFS); | |
ba1da2f4 | 2234 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
1b1e2135 | 2235 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 2236 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
9069218d | 2237 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 2238 | BTRFS_I(inode)->disk_i_size = 0; |
39279cc3 | 2239 | BTRFS_I(inode)->root = root; |
b888db2b | 2240 | |
39279cc3 CM |
2241 | if (mode & S_IFDIR) |
2242 | owner = 0; | |
2243 | else | |
2244 | owner = 1; | |
6324fbf3 | 2245 | new_inode_group = btrfs_find_block_group(root, group, 0, |
0b86a832 | 2246 | BTRFS_BLOCK_GROUP_METADATA, owner); |
6324fbf3 CM |
2247 | if (!new_inode_group) { |
2248 | printk("find_block group failed\n"); | |
2249 | new_inode_group = group; | |
2250 | } | |
2251 | BTRFS_I(inode)->block_group = new_inode_group; | |
b98b6767 | 2252 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
2253 | |
2254 | key[0].objectid = objectid; | |
2255 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
2256 | key[0].offset = 0; | |
2257 | ||
2258 | key[1].objectid = objectid; | |
2259 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
2260 | key[1].offset = ref_objectid; | |
2261 | ||
2262 | sizes[0] = sizeof(struct btrfs_inode_item); | |
2263 | sizes[1] = name_len + sizeof(*ref); | |
2264 | ||
2265 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
2266 | if (ret != 0) | |
5f39d397 CM |
2267 | goto fail; |
2268 | ||
9c58309d CM |
2269 | if (objectid > root->highest_inode) |
2270 | root->highest_inode = objectid; | |
2271 | ||
39279cc3 CM |
2272 | inode->i_uid = current->fsuid; |
2273 | inode->i_gid = current->fsgid; | |
2274 | inode->i_mode = mode; | |
2275 | inode->i_ino = objectid; | |
2276 | inode->i_blocks = 0; | |
2277 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
2278 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2279 | struct btrfs_inode_item); | |
2280 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
2281 | |
2282 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
2283 | struct btrfs_inode_ref); | |
2284 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
aec7477b | 2285 | btrfs_set_inode_ref_index(path->nodes[0], ref, BTRFS_I(inode)->index); |
9c58309d CM |
2286 | ptr = (unsigned long)(ref + 1); |
2287 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
2288 | ||
5f39d397 CM |
2289 | btrfs_mark_buffer_dirty(path->nodes[0]); |
2290 | btrfs_free_path(path); | |
2291 | ||
39279cc3 CM |
2292 | location = &BTRFS_I(inode)->location; |
2293 | location->objectid = objectid; | |
39279cc3 CM |
2294 | location->offset = 0; |
2295 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
2296 | ||
39279cc3 CM |
2297 | insert_inode_hash(inode); |
2298 | return inode; | |
5f39d397 | 2299 | fail: |
aec7477b JB |
2300 | if (dir) |
2301 | BTRFS_I(dir)->index_cnt--; | |
5f39d397 CM |
2302 | btrfs_free_path(path); |
2303 | return ERR_PTR(ret); | |
39279cc3 CM |
2304 | } |
2305 | ||
2306 | static inline u8 btrfs_inode_type(struct inode *inode) | |
2307 | { | |
2308 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
2309 | } | |
2310 | ||
2311 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d CM |
2312 | struct dentry *dentry, struct inode *inode, |
2313 | int add_backref) | |
39279cc3 CM |
2314 | { |
2315 | int ret; | |
2316 | struct btrfs_key key; | |
2317 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
aec7477b | 2318 | struct inode *parent_inode = dentry->d_parent->d_inode; |
5f39d397 | 2319 | |
39279cc3 | 2320 | key.objectid = inode->i_ino; |
39279cc3 CM |
2321 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
2322 | key.offset = 0; | |
2323 | ||
2324 | ret = btrfs_insert_dir_item(trans, root, | |
2325 | dentry->d_name.name, dentry->d_name.len, | |
2326 | dentry->d_parent->d_inode->i_ino, | |
aec7477b JB |
2327 | &key, btrfs_inode_type(inode), |
2328 | BTRFS_I(inode)->index); | |
39279cc3 | 2329 | if (ret == 0) { |
9c58309d CM |
2330 | if (add_backref) { |
2331 | ret = btrfs_insert_inode_ref(trans, root, | |
2332 | dentry->d_name.name, | |
2333 | dentry->d_name.len, | |
2334 | inode->i_ino, | |
aec7477b JB |
2335 | parent_inode->i_ino, |
2336 | BTRFS_I(inode)->index); | |
9c58309d | 2337 | } |
dbe674a9 CM |
2338 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
2339 | dentry->d_name.len * 2); | |
79c44584 | 2340 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
39279cc3 CM |
2341 | ret = btrfs_update_inode(trans, root, |
2342 | dentry->d_parent->d_inode); | |
2343 | } | |
2344 | return ret; | |
2345 | } | |
2346 | ||
2347 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d CM |
2348 | struct dentry *dentry, struct inode *inode, |
2349 | int backref) | |
39279cc3 | 2350 | { |
9c58309d | 2351 | int err = btrfs_add_link(trans, dentry, inode, backref); |
39279cc3 CM |
2352 | if (!err) { |
2353 | d_instantiate(dentry, inode); | |
2354 | return 0; | |
2355 | } | |
2356 | if (err > 0) | |
2357 | err = -EEXIST; | |
2358 | return err; | |
2359 | } | |
2360 | ||
618e21d5 JB |
2361 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
2362 | int mode, dev_t rdev) | |
2363 | { | |
2364 | struct btrfs_trans_handle *trans; | |
2365 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 2366 | struct inode *inode = NULL; |
618e21d5 JB |
2367 | int err; |
2368 | int drop_inode = 0; | |
2369 | u64 objectid; | |
1832a6d5 | 2370 | unsigned long nr = 0; |
618e21d5 JB |
2371 | |
2372 | if (!new_valid_dev(rdev)) | |
2373 | return -EINVAL; | |
2374 | ||
1832a6d5 CM |
2375 | err = btrfs_check_free_space(root, 1, 0); |
2376 | if (err) | |
2377 | goto fail; | |
2378 | ||
618e21d5 JB |
2379 | trans = btrfs_start_transaction(root, 1); |
2380 | btrfs_set_trans_block_group(trans, dir); | |
2381 | ||
2382 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2383 | if (err) { | |
2384 | err = -ENOSPC; | |
2385 | goto out_unlock; | |
2386 | } | |
2387 | ||
aec7477b | 2388 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
2389 | dentry->d_name.len, |
2390 | dentry->d_parent->d_inode->i_ino, objectid, | |
618e21d5 JB |
2391 | BTRFS_I(dir)->block_group, mode); |
2392 | err = PTR_ERR(inode); | |
2393 | if (IS_ERR(inode)) | |
2394 | goto out_unlock; | |
2395 | ||
33268eaf JB |
2396 | err = btrfs_init_acl(inode, dir); |
2397 | if (err) { | |
2398 | drop_inode = 1; | |
2399 | goto out_unlock; | |
2400 | } | |
2401 | ||
618e21d5 | 2402 | btrfs_set_trans_block_group(trans, inode); |
9c58309d | 2403 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
618e21d5 JB |
2404 | if (err) |
2405 | drop_inode = 1; | |
2406 | else { | |
2407 | inode->i_op = &btrfs_special_inode_operations; | |
2408 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 2409 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
2410 | } |
2411 | dir->i_sb->s_dirt = 1; | |
2412 | btrfs_update_inode_block_group(trans, inode); | |
2413 | btrfs_update_inode_block_group(trans, dir); | |
2414 | out_unlock: | |
d3c2fdcf | 2415 | nr = trans->blocks_used; |
89ce8a63 | 2416 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2417 | fail: |
618e21d5 JB |
2418 | if (drop_inode) { |
2419 | inode_dec_link_count(inode); | |
2420 | iput(inode); | |
2421 | } | |
d3c2fdcf | 2422 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
2423 | return err; |
2424 | } | |
2425 | ||
39279cc3 CM |
2426 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
2427 | int mode, struct nameidata *nd) | |
2428 | { | |
2429 | struct btrfs_trans_handle *trans; | |
2430 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 2431 | struct inode *inode = NULL; |
39279cc3 CM |
2432 | int err; |
2433 | int drop_inode = 0; | |
1832a6d5 | 2434 | unsigned long nr = 0; |
39279cc3 CM |
2435 | u64 objectid; |
2436 | ||
1832a6d5 CM |
2437 | err = btrfs_check_free_space(root, 1, 0); |
2438 | if (err) | |
2439 | goto fail; | |
39279cc3 CM |
2440 | trans = btrfs_start_transaction(root, 1); |
2441 | btrfs_set_trans_block_group(trans, dir); | |
2442 | ||
2443 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2444 | if (err) { | |
2445 | err = -ENOSPC; | |
2446 | goto out_unlock; | |
2447 | } | |
2448 | ||
aec7477b | 2449 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
2450 | dentry->d_name.len, |
2451 | dentry->d_parent->d_inode->i_ino, | |
2452 | objectid, BTRFS_I(dir)->block_group, mode); | |
39279cc3 CM |
2453 | err = PTR_ERR(inode); |
2454 | if (IS_ERR(inode)) | |
2455 | goto out_unlock; | |
2456 | ||
33268eaf JB |
2457 | err = btrfs_init_acl(inode, dir); |
2458 | if (err) { | |
2459 | drop_inode = 1; | |
2460 | goto out_unlock; | |
2461 | } | |
2462 | ||
39279cc3 | 2463 | btrfs_set_trans_block_group(trans, inode); |
9c58309d | 2464 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
2465 | if (err) |
2466 | drop_inode = 1; | |
2467 | else { | |
2468 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 2469 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
2470 | inode->i_fop = &btrfs_file_operations; |
2471 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
2472 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2473 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 2474 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
2475 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
2476 | inode->i_mapping, GFP_NOFS); | |
1b1e2135 | 2477 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 2478 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
9069218d | 2479 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 2480 | BTRFS_I(inode)->disk_i_size = 0; |
d1310b2e | 2481 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
ba1da2f4 | 2482 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
39279cc3 CM |
2483 | } |
2484 | dir->i_sb->s_dirt = 1; | |
2485 | btrfs_update_inode_block_group(trans, inode); | |
2486 | btrfs_update_inode_block_group(trans, dir); | |
2487 | out_unlock: | |
d3c2fdcf | 2488 | nr = trans->blocks_used; |
89ce8a63 | 2489 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2490 | fail: |
39279cc3 CM |
2491 | if (drop_inode) { |
2492 | inode_dec_link_count(inode); | |
2493 | iput(inode); | |
2494 | } | |
d3c2fdcf | 2495 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2496 | return err; |
2497 | } | |
2498 | ||
2499 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
2500 | struct dentry *dentry) | |
2501 | { | |
2502 | struct btrfs_trans_handle *trans; | |
2503 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2504 | struct inode *inode = old_dentry->d_inode; | |
1832a6d5 | 2505 | unsigned long nr = 0; |
39279cc3 CM |
2506 | int err; |
2507 | int drop_inode = 0; | |
2508 | ||
2509 | if (inode->i_nlink == 0) | |
2510 | return -ENOENT; | |
2511 | ||
6da6abae CM |
2512 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
2513 | inode->i_nlink++; | |
2514 | #else | |
39279cc3 | 2515 | inc_nlink(inode); |
6da6abae | 2516 | #endif |
1832a6d5 CM |
2517 | err = btrfs_check_free_space(root, 1, 0); |
2518 | if (err) | |
2519 | goto fail; | |
aec7477b JB |
2520 | err = btrfs_set_inode_index(dir, inode); |
2521 | if (err) | |
2522 | goto fail; | |
2523 | ||
39279cc3 | 2524 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2525 | |
39279cc3 CM |
2526 | btrfs_set_trans_block_group(trans, dir); |
2527 | atomic_inc(&inode->i_count); | |
aec7477b | 2528 | |
9c58309d | 2529 | err = btrfs_add_nondir(trans, dentry, inode, 1); |
5f39d397 | 2530 | |
39279cc3 CM |
2531 | if (err) |
2532 | drop_inode = 1; | |
5f39d397 | 2533 | |
39279cc3 CM |
2534 | dir->i_sb->s_dirt = 1; |
2535 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 2536 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 2537 | |
54aa1f4d CM |
2538 | if (err) |
2539 | drop_inode = 1; | |
39279cc3 | 2540 | |
d3c2fdcf | 2541 | nr = trans->blocks_used; |
89ce8a63 | 2542 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2543 | fail: |
39279cc3 CM |
2544 | if (drop_inode) { |
2545 | inode_dec_link_count(inode); | |
2546 | iput(inode); | |
2547 | } | |
d3c2fdcf | 2548 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2549 | return err; |
2550 | } | |
2551 | ||
39279cc3 CM |
2552 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2553 | { | |
b9d86667 | 2554 | struct inode *inode = NULL; |
39279cc3 CM |
2555 | struct btrfs_trans_handle *trans; |
2556 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2557 | int err = 0; | |
2558 | int drop_on_err = 0; | |
b9d86667 | 2559 | u64 objectid = 0; |
d3c2fdcf | 2560 | unsigned long nr = 1; |
39279cc3 | 2561 | |
1832a6d5 CM |
2562 | err = btrfs_check_free_space(root, 1, 0); |
2563 | if (err) | |
2564 | goto out_unlock; | |
2565 | ||
39279cc3 CM |
2566 | trans = btrfs_start_transaction(root, 1); |
2567 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 2568 | |
39279cc3 CM |
2569 | if (IS_ERR(trans)) { |
2570 | err = PTR_ERR(trans); | |
2571 | goto out_unlock; | |
2572 | } | |
2573 | ||
2574 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2575 | if (err) { | |
2576 | err = -ENOSPC; | |
2577 | goto out_unlock; | |
2578 | } | |
2579 | ||
aec7477b | 2580 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
2581 | dentry->d_name.len, |
2582 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
2583 | BTRFS_I(dir)->block_group, S_IFDIR | mode); |
2584 | if (IS_ERR(inode)) { | |
2585 | err = PTR_ERR(inode); | |
2586 | goto out_fail; | |
2587 | } | |
5f39d397 | 2588 | |
39279cc3 | 2589 | drop_on_err = 1; |
33268eaf JB |
2590 | |
2591 | err = btrfs_init_acl(inode, dir); | |
2592 | if (err) | |
2593 | goto out_fail; | |
2594 | ||
39279cc3 CM |
2595 | inode->i_op = &btrfs_dir_inode_operations; |
2596 | inode->i_fop = &btrfs_dir_file_operations; | |
2597 | btrfs_set_trans_block_group(trans, inode); | |
2598 | ||
dbe674a9 | 2599 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
2600 | err = btrfs_update_inode(trans, root, inode); |
2601 | if (err) | |
2602 | goto out_fail; | |
5f39d397 | 2603 | |
9c58309d | 2604 | err = btrfs_add_link(trans, dentry, inode, 0); |
39279cc3 CM |
2605 | if (err) |
2606 | goto out_fail; | |
5f39d397 | 2607 | |
39279cc3 CM |
2608 | d_instantiate(dentry, inode); |
2609 | drop_on_err = 0; | |
2610 | dir->i_sb->s_dirt = 1; | |
2611 | btrfs_update_inode_block_group(trans, inode); | |
2612 | btrfs_update_inode_block_group(trans, dir); | |
2613 | ||
2614 | out_fail: | |
d3c2fdcf | 2615 | nr = trans->blocks_used; |
89ce8a63 | 2616 | btrfs_end_transaction_throttle(trans, root); |
5f39d397 | 2617 | |
39279cc3 | 2618 | out_unlock: |
39279cc3 CM |
2619 | if (drop_on_err) |
2620 | iput(inode); | |
d3c2fdcf | 2621 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2622 | return err; |
2623 | } | |
2624 | ||
3b951516 CM |
2625 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
2626 | struct extent_map *existing, | |
e6dcd2dc CM |
2627 | struct extent_map *em, |
2628 | u64 map_start, u64 map_len) | |
3b951516 CM |
2629 | { |
2630 | u64 start_diff; | |
3b951516 | 2631 | |
e6dcd2dc CM |
2632 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
2633 | start_diff = map_start - em->start; | |
2634 | em->start = map_start; | |
2635 | em->len = map_len; | |
2636 | if (em->block_start < EXTENT_MAP_LAST_BYTE) | |
2637 | em->block_start += start_diff; | |
2638 | return add_extent_mapping(em_tree, em); | |
3b951516 CM |
2639 | } |
2640 | ||
a52d9a80 | 2641 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 2642 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
2643 | int create) |
2644 | { | |
2645 | int ret; | |
2646 | int err = 0; | |
db94535d | 2647 | u64 bytenr; |
a52d9a80 CM |
2648 | u64 extent_start = 0; |
2649 | u64 extent_end = 0; | |
2650 | u64 objectid = inode->i_ino; | |
2651 | u32 found_type; | |
f421950f | 2652 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
2653 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2654 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
2655 | struct extent_buffer *leaf; |
2656 | struct btrfs_key found_key; | |
a52d9a80 CM |
2657 | struct extent_map *em = NULL; |
2658 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 2659 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
2660 | struct btrfs_trans_handle *trans = NULL; |
2661 | ||
a52d9a80 | 2662 | again: |
d1310b2e CM |
2663 | spin_lock(&em_tree->lock); |
2664 | em = lookup_extent_mapping(em_tree, start, len); | |
a061fc8d CM |
2665 | if (em) |
2666 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
d1310b2e CM |
2667 | spin_unlock(&em_tree->lock); |
2668 | ||
a52d9a80 | 2669 | if (em) { |
e1c4b745 CM |
2670 | if (em->start > start || em->start + em->len <= start) |
2671 | free_extent_map(em); | |
2672 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
2673 | free_extent_map(em); |
2674 | else | |
2675 | goto out; | |
a52d9a80 | 2676 | } |
d1310b2e | 2677 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 2678 | if (!em) { |
d1310b2e CM |
2679 | err = -ENOMEM; |
2680 | goto out; | |
a52d9a80 | 2681 | } |
e6dcd2dc | 2682 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e CM |
2683 | em->start = EXTENT_MAP_HOLE; |
2684 | em->len = (u64)-1; | |
f421950f CM |
2685 | |
2686 | if (!path) { | |
2687 | path = btrfs_alloc_path(); | |
2688 | BUG_ON(!path); | |
2689 | } | |
2690 | ||
179e29e4 CM |
2691 | ret = btrfs_lookup_file_extent(trans, root, path, |
2692 | objectid, start, trans != NULL); | |
a52d9a80 CM |
2693 | if (ret < 0) { |
2694 | err = ret; | |
2695 | goto out; | |
2696 | } | |
2697 | ||
2698 | if (ret != 0) { | |
2699 | if (path->slots[0] == 0) | |
2700 | goto not_found; | |
2701 | path->slots[0]--; | |
2702 | } | |
2703 | ||
5f39d397 CM |
2704 | leaf = path->nodes[0]; |
2705 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 2706 | struct btrfs_file_extent_item); |
a52d9a80 | 2707 | /* are we inside the extent that was found? */ |
5f39d397 CM |
2708 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2709 | found_type = btrfs_key_type(&found_key); | |
2710 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
2711 | found_type != BTRFS_EXTENT_DATA_KEY) { |
2712 | goto not_found; | |
2713 | } | |
2714 | ||
5f39d397 CM |
2715 | found_type = btrfs_file_extent_type(leaf, item); |
2716 | extent_start = found_key.offset; | |
a52d9a80 CM |
2717 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
2718 | extent_end = extent_start + | |
db94535d | 2719 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 2720 | err = 0; |
b888db2b | 2721 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2722 | em->start = start; |
2723 | if (start < extent_start) { | |
d1310b2e | 2724 | if (start + len <= extent_start) |
b888db2b | 2725 | goto not_found; |
d1310b2e | 2726 | em->len = extent_end - extent_start; |
a52d9a80 | 2727 | } else { |
d1310b2e | 2728 | em->len = len; |
a52d9a80 CM |
2729 | } |
2730 | goto not_found_em; | |
2731 | } | |
db94535d CM |
2732 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2733 | if (bytenr == 0) { | |
a52d9a80 | 2734 | em->start = extent_start; |
d1310b2e | 2735 | em->len = extent_end - extent_start; |
5f39d397 | 2736 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2737 | goto insert; |
2738 | } | |
db94535d CM |
2739 | bytenr += btrfs_file_extent_offset(leaf, item); |
2740 | em->block_start = bytenr; | |
a52d9a80 | 2741 | em->start = extent_start; |
d1310b2e | 2742 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2743 | goto insert; |
2744 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2745 | u64 page_start; |
5f39d397 | 2746 | unsigned long ptr; |
a52d9a80 | 2747 | char *map; |
3326d1b0 CM |
2748 | size_t size; |
2749 | size_t extent_offset; | |
2750 | size_t copy_size; | |
a52d9a80 | 2751 | |
5f39d397 CM |
2752 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2753 | path->slots[0])); | |
d1310b2e CM |
2754 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2755 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2756 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2757 | em->start = start; |
2758 | if (start < extent_start) { | |
d1310b2e | 2759 | if (start + len <= extent_start) |
b888db2b | 2760 | goto not_found; |
d1310b2e | 2761 | em->len = extent_end - extent_start; |
a52d9a80 | 2762 | } else { |
d1310b2e | 2763 | em->len = len; |
a52d9a80 CM |
2764 | } |
2765 | goto not_found_em; | |
2766 | } | |
689f9346 | 2767 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2768 | |
2769 | if (!page) { | |
2770 | em->start = extent_start; | |
d1310b2e | 2771 | em->len = size; |
689f9346 Y |
2772 | goto out; |
2773 | } | |
5f39d397 | 2774 | |
70dec807 CM |
2775 | page_start = page_offset(page) + pg_offset; |
2776 | extent_offset = page_start - extent_start; | |
2777 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2778 | size - extent_offset); |
3326d1b0 | 2779 | em->start = extent_start + extent_offset; |
70dec807 CM |
2780 | em->len = (copy_size + root->sectorsize - 1) & |
2781 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2782 | map = kmap(page); |
2783 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2784 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2785 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2786 | copy_size); |
2787 | flush_dcache_page(page); | |
2788 | } else if (create && PageUptodate(page)) { | |
2789 | if (!trans) { | |
2790 | kunmap(page); | |
2791 | free_extent_map(em); | |
2792 | em = NULL; | |
2793 | btrfs_release_path(root, path); | |
f9295749 | 2794 | trans = btrfs_join_transaction(root, 1); |
179e29e4 CM |
2795 | goto again; |
2796 | } | |
70dec807 | 2797 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2798 | copy_size); |
2799 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2800 | } |
a52d9a80 | 2801 | kunmap(page); |
d1310b2e CM |
2802 | set_extent_uptodate(io_tree, em->start, |
2803 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2804 | goto insert; |
2805 | } else { | |
2806 | printk("unkknown found_type %d\n", found_type); | |
2807 | WARN_ON(1); | |
2808 | } | |
2809 | not_found: | |
2810 | em->start = start; | |
d1310b2e | 2811 | em->len = len; |
a52d9a80 | 2812 | not_found_em: |
5f39d397 | 2813 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2814 | insert: |
2815 | btrfs_release_path(root, path); | |
d1310b2e CM |
2816 | if (em->start > start || extent_map_end(em) <= start) { |
2817 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2818 | err = -EIO; |
2819 | goto out; | |
2820 | } | |
d1310b2e CM |
2821 | |
2822 | err = 0; | |
2823 | spin_lock(&em_tree->lock); | |
a52d9a80 | 2824 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
2825 | /* it is possible that someone inserted the extent into the tree |
2826 | * while we had the lock dropped. It is also possible that | |
2827 | * an overlapping map exists in the tree | |
2828 | */ | |
a52d9a80 | 2829 | if (ret == -EEXIST) { |
3b951516 | 2830 | struct extent_map *existing; |
e6dcd2dc CM |
2831 | |
2832 | ret = 0; | |
2833 | ||
3b951516 | 2834 | existing = lookup_extent_mapping(em_tree, start, len); |
e1c4b745 CM |
2835 | if (existing && (existing->start > start || |
2836 | existing->start + existing->len <= start)) { | |
2837 | free_extent_map(existing); | |
2838 | existing = NULL; | |
2839 | } | |
3b951516 CM |
2840 | if (!existing) { |
2841 | existing = lookup_extent_mapping(em_tree, em->start, | |
2842 | em->len); | |
2843 | if (existing) { | |
2844 | err = merge_extent_mapping(em_tree, existing, | |
e6dcd2dc CM |
2845 | em, start, |
2846 | root->sectorsize); | |
3b951516 CM |
2847 | free_extent_map(existing); |
2848 | if (err) { | |
2849 | free_extent_map(em); | |
2850 | em = NULL; | |
2851 | } | |
2852 | } else { | |
2853 | err = -EIO; | |
2854 | printk("failing to insert %Lu %Lu\n", | |
2855 | start, len); | |
2856 | free_extent_map(em); | |
2857 | em = NULL; | |
2858 | } | |
2859 | } else { | |
2860 | free_extent_map(em); | |
2861 | em = existing; | |
e6dcd2dc | 2862 | err = 0; |
a52d9a80 | 2863 | } |
a52d9a80 | 2864 | } |
d1310b2e | 2865 | spin_unlock(&em_tree->lock); |
a52d9a80 | 2866 | out: |
f421950f CM |
2867 | if (path) |
2868 | btrfs_free_path(path); | |
a52d9a80 CM |
2869 | if (trans) { |
2870 | ret = btrfs_end_transaction(trans, root); | |
e6dcd2dc | 2871 | if (!err) { |
a52d9a80 | 2872 | err = ret; |
e6dcd2dc | 2873 | } |
a52d9a80 | 2874 | } |
a52d9a80 CM |
2875 | if (err) { |
2876 | free_extent_map(em); | |
2877 | WARN_ON(1); | |
2878 | return ERR_PTR(err); | |
2879 | } | |
2880 | return em; | |
2881 | } | |
2882 | ||
e1c4b745 | 2883 | #if 0 /* waiting for O_DIRECT reads */ |
16432985 CM |
2884 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
2885 | struct buffer_head *bh_result, int create) | |
2886 | { | |
2887 | struct extent_map *em; | |
2888 | u64 start = (u64)iblock << inode->i_blkbits; | |
2889 | struct btrfs_multi_bio *multi = NULL; | |
2890 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2891 | u64 len; | |
2892 | u64 logical; | |
2893 | u64 map_length; | |
2894 | int ret = 0; | |
2895 | ||
2896 | em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0); | |
2897 | ||
2898 | if (!em || IS_ERR(em)) | |
2899 | goto out; | |
2900 | ||
e1c4b745 | 2901 | if (em->start > start || em->start + em->len <= start) { |
16432985 | 2902 | goto out; |
e1c4b745 | 2903 | } |
16432985 CM |
2904 | |
2905 | if (em->block_start == EXTENT_MAP_INLINE) { | |
2906 | ret = -EINVAL; | |
2907 | goto out; | |
2908 | } | |
2909 | ||
e1c4b745 CM |
2910 | len = em->start + em->len - start; |
2911 | len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size))); | |
2912 | ||
16432985 CM |
2913 | if (em->block_start == EXTENT_MAP_HOLE || |
2914 | em->block_start == EXTENT_MAP_DELALLOC) { | |
e1c4b745 | 2915 | bh_result->b_size = len; |
16432985 CM |
2916 | goto out; |
2917 | } | |
2918 | ||
16432985 CM |
2919 | logical = start - em->start; |
2920 | logical = em->block_start + logical; | |
2921 | ||
2922 | map_length = len; | |
2923 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
2924 | logical, &map_length, &multi, 0); | |
2925 | BUG_ON(ret); | |
2926 | bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits; | |
2927 | bh_result->b_size = min(map_length, len); | |
e1c4b745 | 2928 | |
16432985 CM |
2929 | bh_result->b_bdev = multi->stripes[0].dev->bdev; |
2930 | set_buffer_mapped(bh_result); | |
2931 | kfree(multi); | |
2932 | out: | |
2933 | free_extent_map(em); | |
2934 | return ret; | |
2935 | } | |
e1c4b745 | 2936 | #endif |
16432985 CM |
2937 | |
2938 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, | |
2939 | const struct iovec *iov, loff_t offset, | |
2940 | unsigned long nr_segs) | |
2941 | { | |
e1c4b745 CM |
2942 | return -EINVAL; |
2943 | #if 0 | |
16432985 CM |
2944 | struct file *file = iocb->ki_filp; |
2945 | struct inode *inode = file->f_mapping->host; | |
2946 | ||
2947 | if (rw == WRITE) | |
2948 | return -EINVAL; | |
2949 | ||
2950 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
2951 | offset, nr_segs, btrfs_get_block, NULL); | |
e1c4b745 | 2952 | #endif |
16432985 CM |
2953 | } |
2954 | ||
d396c6f5 | 2955 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2956 | { |
d396c6f5 | 2957 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2958 | } |
2959 | ||
a52d9a80 | 2960 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2961 | { |
d1310b2e CM |
2962 | struct extent_io_tree *tree; |
2963 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2964 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2965 | } |
1832a6d5 | 2966 | |
a52d9a80 | 2967 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2968 | { |
d1310b2e | 2969 | struct extent_io_tree *tree; |
b888db2b CM |
2970 | |
2971 | ||
2972 | if (current->flags & PF_MEMALLOC) { | |
2973 | redirty_page_for_writepage(wbc, page); | |
2974 | unlock_page(page); | |
2975 | return 0; | |
2976 | } | |
d1310b2e | 2977 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2978 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2979 | } |
2980 | ||
f421950f CM |
2981 | int btrfs_writepages(struct address_space *mapping, |
2982 | struct writeback_control *wbc) | |
b293f02e | 2983 | { |
d1310b2e CM |
2984 | struct extent_io_tree *tree; |
2985 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2986 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2987 | } | |
2988 | ||
3ab2fb5a CM |
2989 | static int |
2990 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2991 | struct list_head *pages, unsigned nr_pages) | |
2992 | { | |
d1310b2e CM |
2993 | struct extent_io_tree *tree; |
2994 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2995 | return extent_readpages(tree, mapping, pages, nr_pages, |
2996 | btrfs_get_extent); | |
2997 | } | |
e6dcd2dc | 2998 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2999 | { |
d1310b2e CM |
3000 | struct extent_io_tree *tree; |
3001 | struct extent_map_tree *map; | |
a52d9a80 | 3002 | int ret; |
8c2383c3 | 3003 | |
d1310b2e CM |
3004 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
3005 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 3006 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
3007 | if (ret == 1) { |
3008 | ClearPagePrivate(page); | |
3009 | set_page_private(page, 0); | |
3010 | page_cache_release(page); | |
39279cc3 | 3011 | } |
a52d9a80 | 3012 | return ret; |
39279cc3 CM |
3013 | } |
3014 | ||
e6dcd2dc CM |
3015 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
3016 | { | |
e6dcd2dc CM |
3017 | return __btrfs_releasepage(page, gfp_flags); |
3018 | } | |
3019 | ||
a52d9a80 | 3020 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 3021 | { |
d1310b2e | 3022 | struct extent_io_tree *tree; |
e6dcd2dc CM |
3023 | struct btrfs_ordered_extent *ordered; |
3024 | u64 page_start = page_offset(page); | |
3025 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
39279cc3 | 3026 | |
e6dcd2dc | 3027 | wait_on_page_writeback(page); |
d1310b2e | 3028 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
e6dcd2dc CM |
3029 | if (offset) { |
3030 | btrfs_releasepage(page, GFP_NOFS); | |
3031 | return; | |
3032 | } | |
3033 | ||
3034 | lock_extent(tree, page_start, page_end, GFP_NOFS); | |
3035 | ordered = btrfs_lookup_ordered_extent(page->mapping->host, | |
3036 | page_offset(page)); | |
3037 | if (ordered) { | |
eb84ae03 CM |
3038 | /* |
3039 | * IO on this page will never be started, so we need | |
3040 | * to account for any ordered extents now | |
3041 | */ | |
e6dcd2dc CM |
3042 | clear_extent_bit(tree, page_start, page_end, |
3043 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
3044 | EXTENT_LOCKED, 1, 0, GFP_NOFS); | |
211f90e6 CM |
3045 | btrfs_finish_ordered_io(page->mapping->host, |
3046 | page_start, page_end); | |
e6dcd2dc CM |
3047 | btrfs_put_ordered_extent(ordered); |
3048 | lock_extent(tree, page_start, page_end, GFP_NOFS); | |
3049 | } | |
3050 | clear_extent_bit(tree, page_start, page_end, | |
3051 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | | |
3052 | EXTENT_ORDERED, | |
3053 | 1, 1, GFP_NOFS); | |
3054 | __btrfs_releasepage(page, GFP_NOFS); | |
3055 | ||
4a096752 | 3056 | ClearPageChecked(page); |
9ad6b7bc | 3057 | if (PagePrivate(page)) { |
9ad6b7bc CM |
3058 | ClearPagePrivate(page); |
3059 | set_page_private(page, 0); | |
3060 | page_cache_release(page); | |
3061 | } | |
39279cc3 CM |
3062 | } |
3063 | ||
9ebefb18 CM |
3064 | /* |
3065 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
3066 | * called from a page fault handler when a page is first dirtied. Hence we must | |
3067 | * be careful to check for EOF conditions here. We set the page up correctly | |
3068 | * for a written page which means we get ENOSPC checking when writing into | |
3069 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
3070 | * support these features. | |
3071 | * | |
3072 | * We are not allowed to take the i_mutex here so we have to play games to | |
3073 | * protect against truncate races as the page could now be beyond EOF. Because | |
3074 | * vmtruncate() writes the inode size before removing pages, once we have the | |
3075 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
3076 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
3077 | * unlock the page. | |
3078 | */ | |
3079 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
3080 | { | |
6da6abae | 3081 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 3082 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
3083 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
3084 | struct btrfs_ordered_extent *ordered; | |
3085 | char *kaddr; | |
3086 | unsigned long zero_start; | |
9ebefb18 | 3087 | loff_t size; |
1832a6d5 | 3088 | int ret; |
a52d9a80 | 3089 | u64 page_start; |
e6dcd2dc | 3090 | u64 page_end; |
9ebefb18 | 3091 | |
1832a6d5 | 3092 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); |
1832a6d5 CM |
3093 | if (ret) |
3094 | goto out; | |
3095 | ||
3096 | ret = -EINVAL; | |
e6dcd2dc | 3097 | again: |
9ebefb18 | 3098 | lock_page(page); |
9ebefb18 | 3099 | size = i_size_read(inode); |
e6dcd2dc CM |
3100 | page_start = page_offset(page); |
3101 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
a52d9a80 | 3102 | |
9ebefb18 | 3103 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 3104 | (page_start >= size)) { |
9ebefb18 CM |
3105 | /* page got truncated out from underneath us */ |
3106 | goto out_unlock; | |
3107 | } | |
e6dcd2dc CM |
3108 | wait_on_page_writeback(page); |
3109 | ||
3110 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3111 | set_page_extent_mapped(page); | |
3112 | ||
eb84ae03 CM |
3113 | /* |
3114 | * we can't set the delalloc bits if there are pending ordered | |
3115 | * extents. Drop our locks and wait for them to finish | |
3116 | */ | |
e6dcd2dc CM |
3117 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
3118 | if (ordered) { | |
3119 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3120 | unlock_page(page); | |
eb84ae03 | 3121 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
3122 | btrfs_put_ordered_extent(ordered); |
3123 | goto again; | |
3124 | } | |
3125 | ||
3126 | set_extent_delalloc(&BTRFS_I(inode)->io_tree, page_start, | |
3127 | page_end, GFP_NOFS); | |
3128 | ret = 0; | |
9ebefb18 CM |
3129 | |
3130 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 3131 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 3132 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 3133 | else |
e6dcd2dc | 3134 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 3135 | |
e6dcd2dc CM |
3136 | if (zero_start != PAGE_CACHE_SIZE) { |
3137 | kaddr = kmap(page); | |
3138 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
3139 | flush_dcache_page(page); | |
3140 | kunmap(page); | |
3141 | } | |
247e743c | 3142 | ClearPageChecked(page); |
e6dcd2dc CM |
3143 | set_page_dirty(page); |
3144 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
9ebefb18 CM |
3145 | |
3146 | out_unlock: | |
3147 | unlock_page(page); | |
1832a6d5 | 3148 | out: |
9ebefb18 CM |
3149 | return ret; |
3150 | } | |
3151 | ||
39279cc3 CM |
3152 | static void btrfs_truncate(struct inode *inode) |
3153 | { | |
3154 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3155 | int ret; | |
3156 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 3157 | unsigned long nr; |
dbe674a9 | 3158 | u64 mask = root->sectorsize - 1; |
39279cc3 CM |
3159 | |
3160 | if (!S_ISREG(inode->i_mode)) | |
3161 | return; | |
3162 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
3163 | return; | |
3164 | ||
3165 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
4a096752 | 3166 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
39279cc3 | 3167 | |
39279cc3 CM |
3168 | trans = btrfs_start_transaction(root, 1); |
3169 | btrfs_set_trans_block_group(trans, inode); | |
dbe674a9 | 3170 | btrfs_i_size_write(inode, inode->i_size); |
39279cc3 | 3171 | |
7b128766 JB |
3172 | ret = btrfs_orphan_add(trans, inode); |
3173 | if (ret) | |
3174 | goto out; | |
39279cc3 | 3175 | /* FIXME, add redo link to tree so we don't leak on crash */ |
85e21bac CM |
3176 | ret = btrfs_truncate_in_trans(trans, root, inode, |
3177 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 3178 | btrfs_update_inode(trans, root, inode); |
5f39d397 | 3179 | |
7b128766 JB |
3180 | ret = btrfs_orphan_del(trans, inode); |
3181 | BUG_ON(ret); | |
3182 | ||
3183 | out: | |
3184 | nr = trans->blocks_used; | |
89ce8a63 | 3185 | ret = btrfs_end_transaction_throttle(trans, root); |
39279cc3 | 3186 | BUG_ON(ret); |
d3c2fdcf | 3187 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
3188 | } |
3189 | ||
3b96362c SW |
3190 | /* |
3191 | * Invalidate a single dcache entry at the root of the filesystem. | |
3192 | * Needed after creation of snapshot or subvolume. | |
3193 | */ | |
3194 | void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name, | |
3195 | int namelen) | |
3196 | { | |
3197 | struct dentry *alias, *entry; | |
3198 | struct qstr qstr; | |
3199 | ||
3200 | alias = d_find_alias(root->fs_info->sb->s_root->d_inode); | |
3201 | if (alias) { | |
3202 | qstr.name = name; | |
3203 | qstr.len = namelen; | |
3204 | /* change me if btrfs ever gets a d_hash operation */ | |
3205 | qstr.hash = full_name_hash(qstr.name, qstr.len); | |
3206 | entry = d_lookup(alias, &qstr); | |
3207 | dput(alias); | |
3208 | if (entry) { | |
3209 | d_invalidate(entry); | |
3210 | dput(entry); | |
3211 | } | |
3212 | } | |
3213 | } | |
3214 | ||
f46b5a66 CH |
3215 | int btrfs_create_subvol_root(struct btrfs_root *new_root, |
3216 | struct btrfs_trans_handle *trans, u64 new_dirid, | |
3217 | struct btrfs_block_group_cache *block_group) | |
39279cc3 | 3218 | { |
39279cc3 | 3219 | struct inode *inode; |
39279cc3 | 3220 | |
aec7477b | 3221 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, new_dirid, |
f46b5a66 | 3222 | new_dirid, block_group, S_IFDIR | 0700); |
54aa1f4d | 3223 | if (IS_ERR(inode)) |
f46b5a66 | 3224 | return PTR_ERR(inode); |
39279cc3 CM |
3225 | inode->i_op = &btrfs_dir_inode_operations; |
3226 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 3227 | new_root->inode = inode; |
39279cc3 | 3228 | |
39279cc3 | 3229 | inode->i_nlink = 1; |
dbe674a9 | 3230 | btrfs_i_size_write(inode, 0); |
3b96362c | 3231 | |
f46b5a66 | 3232 | return btrfs_update_inode(trans, new_root, inode); |
39279cc3 CM |
3233 | } |
3234 | ||
edbd8d4e | 3235 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
3236 | struct file_ra_state *ra, struct file *file, |
3237 | pgoff_t offset, pgoff_t last_index) | |
3238 | { | |
8e7bf94f | 3239 | pgoff_t req_size = last_index - offset + 1; |
86479a04 CM |
3240 | |
3241 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
86479a04 CM |
3242 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); |
3243 | return offset; | |
3244 | #else | |
86479a04 CM |
3245 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); |
3246 | return offset + req_size; | |
3247 | #endif | |
3248 | } | |
3249 | ||
39279cc3 CM |
3250 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
3251 | { | |
3252 | struct btrfs_inode *ei; | |
3253 | ||
3254 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
3255 | if (!ei) | |
3256 | return NULL; | |
15ee9bc7 | 3257 | ei->last_trans = 0; |
e6dcd2dc | 3258 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
33268eaf JB |
3259 | ei->i_acl = BTRFS_ACL_NOT_CACHED; |
3260 | ei->i_default_acl = BTRFS_ACL_NOT_CACHED; | |
7b128766 | 3261 | INIT_LIST_HEAD(&ei->i_orphan); |
39279cc3 CM |
3262 | return &ei->vfs_inode; |
3263 | } | |
3264 | ||
3265 | void btrfs_destroy_inode(struct inode *inode) | |
3266 | { | |
e6dcd2dc | 3267 | struct btrfs_ordered_extent *ordered; |
39279cc3 CM |
3268 | WARN_ON(!list_empty(&inode->i_dentry)); |
3269 | WARN_ON(inode->i_data.nrpages); | |
3270 | ||
33268eaf JB |
3271 | if (BTRFS_I(inode)->i_acl && |
3272 | BTRFS_I(inode)->i_acl != BTRFS_ACL_NOT_CACHED) | |
3273 | posix_acl_release(BTRFS_I(inode)->i_acl); | |
3274 | if (BTRFS_I(inode)->i_default_acl && | |
3275 | BTRFS_I(inode)->i_default_acl != BTRFS_ACL_NOT_CACHED) | |
3276 | posix_acl_release(BTRFS_I(inode)->i_default_acl); | |
3277 | ||
7b128766 JB |
3278 | spin_lock(&BTRFS_I(inode)->root->orphan_lock); |
3279 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { | |
3280 | printk(KERN_ERR "BTRFS: inode %lu: inode still on the orphan" | |
3281 | " list\n", inode->i_ino); | |
3282 | dump_stack(); | |
3283 | } | |
3284 | spin_unlock(&BTRFS_I(inode)->root->orphan_lock); | |
3285 | ||
e6dcd2dc CM |
3286 | while(1) { |
3287 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); | |
3288 | if (!ordered) | |
3289 | break; | |
3290 | else { | |
3291 | printk("found ordered extent %Lu %Lu\n", | |
3292 | ordered->file_offset, ordered->len); | |
3293 | btrfs_remove_ordered_extent(inode, ordered); | |
3294 | btrfs_put_ordered_extent(ordered); | |
3295 | btrfs_put_ordered_extent(ordered); | |
3296 | } | |
3297 | } | |
8c416c9e | 3298 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
3299 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
3300 | } | |
3301 | ||
44ec0b71 CM |
3302 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
3303 | static void init_once(struct kmem_cache * cachep, void *foo) | |
3304 | #else | |
39279cc3 CM |
3305 | static void init_once(void * foo, struct kmem_cache * cachep, |
3306 | unsigned long flags) | |
44ec0b71 | 3307 | #endif |
39279cc3 CM |
3308 | { |
3309 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
3310 | ||
3311 | inode_init_once(&ei->vfs_inode); | |
3312 | } | |
3313 | ||
3314 | void btrfs_destroy_cachep(void) | |
3315 | { | |
3316 | if (btrfs_inode_cachep) | |
3317 | kmem_cache_destroy(btrfs_inode_cachep); | |
3318 | if (btrfs_trans_handle_cachep) | |
3319 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
3320 | if (btrfs_transaction_cachep) | |
3321 | kmem_cache_destroy(btrfs_transaction_cachep); | |
3322 | if (btrfs_bit_radix_cachep) | |
3323 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
3324 | if (btrfs_path_cachep) | |
3325 | kmem_cache_destroy(btrfs_path_cachep); | |
3326 | } | |
3327 | ||
86479a04 | 3328 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 3329 | unsigned long extra_flags, |
44ec0b71 CM |
3330 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) |
3331 | void (*ctor)(struct kmem_cache *, void *) | |
3332 | #else | |
92fee66d | 3333 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
3334 | unsigned long) |
3335 | #endif | |
3336 | ) | |
92fee66d CM |
3337 | { |
3338 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
3339 | SLAB_MEM_SPREAD | extra_flags), ctor | |
3340 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
3341 | ,NULL | |
3342 | #endif | |
3343 | ); | |
3344 | } | |
3345 | ||
39279cc3 CM |
3346 | int btrfs_init_cachep(void) |
3347 | { | |
86479a04 | 3348 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
3349 | sizeof(struct btrfs_inode), |
3350 | 0, init_once); | |
39279cc3 CM |
3351 | if (!btrfs_inode_cachep) |
3352 | goto fail; | |
86479a04 CM |
3353 | btrfs_trans_handle_cachep = |
3354 | btrfs_cache_create("btrfs_trans_handle_cache", | |
3355 | sizeof(struct btrfs_trans_handle), | |
3356 | 0, NULL); | |
39279cc3 CM |
3357 | if (!btrfs_trans_handle_cachep) |
3358 | goto fail; | |
86479a04 | 3359 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 3360 | sizeof(struct btrfs_transaction), |
92fee66d | 3361 | 0, NULL); |
39279cc3 CM |
3362 | if (!btrfs_transaction_cachep) |
3363 | goto fail; | |
86479a04 | 3364 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 3365 | sizeof(struct btrfs_path), |
92fee66d | 3366 | 0, NULL); |
39279cc3 CM |
3367 | if (!btrfs_path_cachep) |
3368 | goto fail; | |
86479a04 | 3369 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 3370 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
3371 | if (!btrfs_bit_radix_cachep) |
3372 | goto fail; | |
3373 | return 0; | |
3374 | fail: | |
3375 | btrfs_destroy_cachep(); | |
3376 | return -ENOMEM; | |
3377 | } | |
3378 | ||
3379 | static int btrfs_getattr(struct vfsmount *mnt, | |
3380 | struct dentry *dentry, struct kstat *stat) | |
3381 | { | |
3382 | struct inode *inode = dentry->d_inode; | |
3383 | generic_fillattr(inode, stat); | |
d6667462 | 3384 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 3385 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
3386 | return 0; |
3387 | } | |
3388 | ||
3389 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
3390 | struct inode * new_dir,struct dentry *new_dentry) | |
3391 | { | |
3392 | struct btrfs_trans_handle *trans; | |
3393 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
3394 | struct inode *new_inode = new_dentry->d_inode; | |
3395 | struct inode *old_inode = old_dentry->d_inode; | |
3396 | struct timespec ctime = CURRENT_TIME; | |
39279cc3 CM |
3397 | int ret; |
3398 | ||
3399 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
3400 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
3401 | return -ENOTEMPTY; | |
3402 | } | |
5f39d397 | 3403 | |
1832a6d5 CM |
3404 | ret = btrfs_check_free_space(root, 1, 0); |
3405 | if (ret) | |
3406 | goto out_unlock; | |
3407 | ||
39279cc3 | 3408 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 3409 | |
39279cc3 | 3410 | btrfs_set_trans_block_group(trans, new_dir); |
39279cc3 CM |
3411 | |
3412 | old_dentry->d_inode->i_nlink++; | |
3413 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
3414 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
3415 | old_inode->i_ctime = ctime; | |
5f39d397 | 3416 | |
39279cc3 CM |
3417 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
3418 | if (ret) | |
3419 | goto out_fail; | |
3420 | ||
3421 | if (new_inode) { | |
3422 | new_inode->i_ctime = CURRENT_TIME; | |
3423 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
3424 | if (ret) | |
3425 | goto out_fail; | |
7b128766 JB |
3426 | if (new_inode->i_nlink == 0) { |
3427 | ret = btrfs_orphan_add(trans, new_inode); | |
3428 | if (ret) | |
3429 | goto out_fail; | |
3430 | } | |
39279cc3 | 3431 | } |
aec7477b JB |
3432 | ret = btrfs_set_inode_index(new_dir, old_inode); |
3433 | if (ret) | |
3434 | goto out_fail; | |
3435 | ||
9c58309d | 3436 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1); |
39279cc3 CM |
3437 | if (ret) |
3438 | goto out_fail; | |
3439 | ||
3440 | out_fail: | |
39279cc3 | 3441 | btrfs_end_transaction(trans, root); |
1832a6d5 | 3442 | out_unlock: |
39279cc3 CM |
3443 | return ret; |
3444 | } | |
3445 | ||
3446 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, | |
3447 | const char *symname) | |
3448 | { | |
3449 | struct btrfs_trans_handle *trans; | |
3450 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
3451 | struct btrfs_path *path; | |
3452 | struct btrfs_key key; | |
1832a6d5 | 3453 | struct inode *inode = NULL; |
39279cc3 CM |
3454 | int err; |
3455 | int drop_inode = 0; | |
3456 | u64 objectid; | |
3457 | int name_len; | |
3458 | int datasize; | |
5f39d397 | 3459 | unsigned long ptr; |
39279cc3 | 3460 | struct btrfs_file_extent_item *ei; |
5f39d397 | 3461 | struct extent_buffer *leaf; |
1832a6d5 | 3462 | unsigned long nr = 0; |
39279cc3 CM |
3463 | |
3464 | name_len = strlen(symname) + 1; | |
3465 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
3466 | return -ENAMETOOLONG; | |
1832a6d5 | 3467 | |
1832a6d5 CM |
3468 | err = btrfs_check_free_space(root, 1, 0); |
3469 | if (err) | |
3470 | goto out_fail; | |
3471 | ||
39279cc3 CM |
3472 | trans = btrfs_start_transaction(root, 1); |
3473 | btrfs_set_trans_block_group(trans, dir); | |
3474 | ||
3475 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
3476 | if (err) { | |
3477 | err = -ENOSPC; | |
3478 | goto out_unlock; | |
3479 | } | |
3480 | ||
aec7477b | 3481 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
3482 | dentry->d_name.len, |
3483 | dentry->d_parent->d_inode->i_ino, objectid, | |
39279cc3 CM |
3484 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO); |
3485 | err = PTR_ERR(inode); | |
3486 | if (IS_ERR(inode)) | |
3487 | goto out_unlock; | |
3488 | ||
33268eaf JB |
3489 | err = btrfs_init_acl(inode, dir); |
3490 | if (err) { | |
3491 | drop_inode = 1; | |
3492 | goto out_unlock; | |
3493 | } | |
3494 | ||
39279cc3 | 3495 | btrfs_set_trans_block_group(trans, inode); |
9c58309d | 3496 | err = btrfs_add_nondir(trans, dentry, inode, 0); |
39279cc3 CM |
3497 | if (err) |
3498 | drop_inode = 1; | |
3499 | else { | |
3500 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 3501 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
3502 | inode->i_fop = &btrfs_file_operations; |
3503 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
3504 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
3505 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 3506 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
3507 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
3508 | inode->i_mapping, GFP_NOFS); | |
1b1e2135 | 3509 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 3510 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
9069218d | 3511 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 3512 | BTRFS_I(inode)->disk_i_size = 0; |
d1310b2e | 3513 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
ba1da2f4 | 3514 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
39279cc3 CM |
3515 | } |
3516 | dir->i_sb->s_dirt = 1; | |
3517 | btrfs_update_inode_block_group(trans, inode); | |
3518 | btrfs_update_inode_block_group(trans, dir); | |
3519 | if (drop_inode) | |
3520 | goto out_unlock; | |
3521 | ||
3522 | path = btrfs_alloc_path(); | |
3523 | BUG_ON(!path); | |
3524 | key.objectid = inode->i_ino; | |
3525 | key.offset = 0; | |
39279cc3 CM |
3526 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
3527 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
3528 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
3529 | datasize); | |
54aa1f4d CM |
3530 | if (err) { |
3531 | drop_inode = 1; | |
3532 | goto out_unlock; | |
3533 | } | |
5f39d397 CM |
3534 | leaf = path->nodes[0]; |
3535 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
3536 | struct btrfs_file_extent_item); | |
3537 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
3538 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
3539 | BTRFS_FILE_EXTENT_INLINE); |
3540 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
3541 | write_extent_buffer(leaf, symname, ptr, name_len); |
3542 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 3543 | btrfs_free_path(path); |
5f39d397 | 3544 | |
39279cc3 CM |
3545 | inode->i_op = &btrfs_symlink_inode_operations; |
3546 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 3547 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
dbe674a9 | 3548 | btrfs_i_size_write(inode, name_len - 1); |
54aa1f4d CM |
3549 | err = btrfs_update_inode(trans, root, inode); |
3550 | if (err) | |
3551 | drop_inode = 1; | |
39279cc3 CM |
3552 | |
3553 | out_unlock: | |
d3c2fdcf | 3554 | nr = trans->blocks_used; |
89ce8a63 | 3555 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 3556 | out_fail: |
39279cc3 CM |
3557 | if (drop_inode) { |
3558 | inode_dec_link_count(inode); | |
3559 | iput(inode); | |
3560 | } | |
d3c2fdcf | 3561 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
3562 | return err; |
3563 | } | |
16432985 | 3564 | |
e6dcd2dc CM |
3565 | static int btrfs_set_page_dirty(struct page *page) |
3566 | { | |
e6dcd2dc CM |
3567 | return __set_page_dirty_nobuffers(page); |
3568 | } | |
3569 | ||
fdebe2bd Y |
3570 | static int btrfs_permission(struct inode *inode, int mask, |
3571 | struct nameidata *nd) | |
3572 | { | |
3573 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
3574 | return -EACCES; | |
33268eaf | 3575 | return generic_permission(inode, mask, btrfs_check_acl); |
fdebe2bd | 3576 | } |
39279cc3 CM |
3577 | |
3578 | static struct inode_operations btrfs_dir_inode_operations = { | |
3579 | .lookup = btrfs_lookup, | |
3580 | .create = btrfs_create, | |
3581 | .unlink = btrfs_unlink, | |
3582 | .link = btrfs_link, | |
3583 | .mkdir = btrfs_mkdir, | |
3584 | .rmdir = btrfs_rmdir, | |
3585 | .rename = btrfs_rename, | |
3586 | .symlink = btrfs_symlink, | |
3587 | .setattr = btrfs_setattr, | |
618e21d5 | 3588 | .mknod = btrfs_mknod, |
5103e947 JB |
3589 | .setxattr = generic_setxattr, |
3590 | .getxattr = generic_getxattr, | |
3591 | .listxattr = btrfs_listxattr, | |
3592 | .removexattr = generic_removexattr, | |
fdebe2bd | 3593 | .permission = btrfs_permission, |
39279cc3 | 3594 | }; |
39279cc3 CM |
3595 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3596 | .lookup = btrfs_lookup, | |
fdebe2bd | 3597 | .permission = btrfs_permission, |
39279cc3 | 3598 | }; |
39279cc3 CM |
3599 | static struct file_operations btrfs_dir_file_operations = { |
3600 | .llseek = generic_file_llseek, | |
3601 | .read = generic_read_dir, | |
3602 | .readdir = btrfs_readdir, | |
34287aa3 | 3603 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 3604 | #ifdef CONFIG_COMPAT |
34287aa3 | 3605 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 3606 | #endif |
6bf13c0c | 3607 | .release = btrfs_release_file, |
39279cc3 CM |
3608 | }; |
3609 | ||
d1310b2e | 3610 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 3611 | .fill_delalloc = run_delalloc_range, |
065631f6 | 3612 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 3613 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac CM |
3614 | .readpage_io_hook = btrfs_readpage_io_hook, |
3615 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, | |
e6dcd2dc | 3616 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 3617 | .writepage_start_hook = btrfs_writepage_start_hook, |
1259ab75 | 3618 | .readpage_io_failed_hook = btrfs_io_failed_hook, |
b0c68f8b CM |
3619 | .set_bit_hook = btrfs_set_bit_hook, |
3620 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
3621 | }; |
3622 | ||
39279cc3 CM |
3623 | static struct address_space_operations btrfs_aops = { |
3624 | .readpage = btrfs_readpage, | |
3625 | .writepage = btrfs_writepage, | |
b293f02e | 3626 | .writepages = btrfs_writepages, |
3ab2fb5a | 3627 | .readpages = btrfs_readpages, |
39279cc3 | 3628 | .sync_page = block_sync_page, |
39279cc3 | 3629 | .bmap = btrfs_bmap, |
16432985 | 3630 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
3631 | .invalidatepage = btrfs_invalidatepage, |
3632 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 3633 | .set_page_dirty = btrfs_set_page_dirty, |
39279cc3 CM |
3634 | }; |
3635 | ||
3636 | static struct address_space_operations btrfs_symlink_aops = { | |
3637 | .readpage = btrfs_readpage, | |
3638 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3639 | .invalidatepage = btrfs_invalidatepage, |
3640 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3641 | }; |
3642 | ||
3643 | static struct inode_operations btrfs_file_inode_operations = { | |
3644 | .truncate = btrfs_truncate, | |
3645 | .getattr = btrfs_getattr, | |
3646 | .setattr = btrfs_setattr, | |
5103e947 JB |
3647 | .setxattr = generic_setxattr, |
3648 | .getxattr = generic_getxattr, | |
3649 | .listxattr = btrfs_listxattr, | |
3650 | .removexattr = generic_removexattr, | |
fdebe2bd | 3651 | .permission = btrfs_permission, |
39279cc3 | 3652 | }; |
618e21d5 JB |
3653 | static struct inode_operations btrfs_special_inode_operations = { |
3654 | .getattr = btrfs_getattr, | |
3655 | .setattr = btrfs_setattr, | |
fdebe2bd | 3656 | .permission = btrfs_permission, |
33268eaf JB |
3657 | .setxattr = generic_setxattr, |
3658 | .getxattr = generic_getxattr, | |
3659 | .listxattr = btrfs_listxattr, | |
3660 | .removexattr = generic_removexattr, | |
618e21d5 | 3661 | }; |
39279cc3 CM |
3662 | static struct inode_operations btrfs_symlink_inode_operations = { |
3663 | .readlink = generic_readlink, | |
3664 | .follow_link = page_follow_link_light, | |
3665 | .put_link = page_put_link, | |
fdebe2bd | 3666 | .permission = btrfs_permission, |
39279cc3 | 3667 | }; |