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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" |
95819c05 | 48 | #include "xattr.h" |
e02119d5 CM |
49 | #include "compat.h" |
50 | #include "tree-log.h" | |
39279cc3 CM |
51 | |
52 | struct btrfs_iget_args { | |
53 | u64 ino; | |
54 | struct btrfs_root *root; | |
55 | }; | |
56 | ||
57 | static struct inode_operations btrfs_dir_inode_operations; | |
58 | static struct inode_operations btrfs_symlink_inode_operations; | |
59 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 60 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
61 | static struct inode_operations btrfs_file_inode_operations; |
62 | static struct address_space_operations btrfs_aops; | |
63 | static struct address_space_operations btrfs_symlink_aops; | |
64 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 65 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
66 | |
67 | static struct kmem_cache *btrfs_inode_cachep; | |
68 | struct kmem_cache *btrfs_trans_handle_cachep; | |
69 | struct kmem_cache *btrfs_transaction_cachep; | |
70 | struct kmem_cache *btrfs_bit_radix_cachep; | |
71 | struct kmem_cache *btrfs_path_cachep; | |
72 | ||
73 | #define S_SHIFT 12 | |
74 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
75 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
76 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
77 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
78 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
79 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
80 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
81 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
82 | }; | |
83 | ||
7b128766 JB |
84 | static void btrfs_truncate(struct inode *inode); |
85 | ||
1832a6d5 CM |
86 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
87 | int for_del) | |
88 | { | |
a2135011 CM |
89 | u64 total; |
90 | u64 used; | |
1832a6d5 | 91 | u64 thresh; |
bcbfce8a | 92 | unsigned long flags; |
1832a6d5 CM |
93 | int ret = 0; |
94 | ||
a2135011 CM |
95 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
96 | total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
97 | used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
1832a6d5 | 98 | if (for_del) |
f9ef6604 | 99 | thresh = total * 90; |
1832a6d5 | 100 | else |
f9ef6604 CM |
101 | thresh = total * 85; |
102 | ||
103 | do_div(thresh, 100); | |
1832a6d5 | 104 | |
1832a6d5 CM |
105 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) |
106 | ret = -ENOSPC; | |
bcbfce8a | 107 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
1832a6d5 CM |
108 | return ret; |
109 | } | |
110 | ||
be20aa9d | 111 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
112 | { |
113 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
114 | struct btrfs_trans_handle *trans; | |
b888db2b | 115 | u64 alloc_hint = 0; |
db94535d | 116 | u64 num_bytes; |
c59f8951 | 117 | u64 cur_alloc_size; |
db94535d | 118 | u64 blocksize = root->sectorsize; |
d1310b2e | 119 | u64 orig_num_bytes; |
be20aa9d | 120 | struct btrfs_key ins; |
e6dcd2dc CM |
121 | struct extent_map *em; |
122 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
123 | int ret = 0; | |
b888db2b | 124 | |
f9295749 | 125 | trans = btrfs_join_transaction(root, 1); |
b888db2b | 126 | BUG_ON(!trans); |
be20aa9d CM |
127 | btrfs_set_trans_block_group(trans, inode); |
128 | ||
db94535d | 129 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 130 | num_bytes = max(blocksize, num_bytes); |
d1310b2e | 131 | orig_num_bytes = num_bytes; |
db94535d | 132 | |
179e29e4 CM |
133 | if (alloc_hint == EXTENT_MAP_INLINE) |
134 | goto out; | |
135 | ||
3b951516 | 136 | BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy)); |
e5a2217e | 137 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
e6dcd2dc | 138 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1); |
e5a2217e | 139 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
3b951516 | 140 | |
c59f8951 CM |
141 | while(num_bytes > 0) { |
142 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
e6dcd2dc | 143 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
0f9dd46c | 144 | root->sectorsize, 0, alloc_hint, |
e6dcd2dc | 145 | (u64)-1, &ins, 1); |
c59f8951 CM |
146 | if (ret) { |
147 | WARN_ON(1); | |
148 | goto out; | |
149 | } | |
e6dcd2dc CM |
150 | em = alloc_extent_map(GFP_NOFS); |
151 | em->start = start; | |
152 | em->len = ins.offset; | |
153 | em->block_start = ins.objectid; | |
154 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
e5a2217e | 155 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
7f3c74fb | 156 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
e6dcd2dc CM |
157 | while(1) { |
158 | spin_lock(&em_tree->lock); | |
159 | ret = add_extent_mapping(em_tree, em); | |
160 | spin_unlock(&em_tree->lock); | |
161 | if (ret != -EEXIST) { | |
162 | free_extent_map(em); | |
163 | break; | |
164 | } | |
165 | btrfs_drop_extent_cache(inode, start, | |
166 | start + ins.offset - 1); | |
167 | } | |
e5a2217e | 168 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
e6dcd2dc | 169 | |
98d20f67 | 170 | cur_alloc_size = ins.offset; |
e6dcd2dc | 171 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
7ea394f1 | 172 | ins.offset, 0); |
e6dcd2dc | 173 | BUG_ON(ret); |
3b951516 CM |
174 | if (num_bytes < cur_alloc_size) { |
175 | printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes, | |
176 | cur_alloc_size); | |
177 | break; | |
178 | } | |
c59f8951 CM |
179 | num_bytes -= cur_alloc_size; |
180 | alloc_hint = ins.objectid + ins.offset; | |
181 | start += cur_alloc_size; | |
b888db2b | 182 | } |
b888db2b CM |
183 | out: |
184 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
185 | return ret; |
186 | } | |
187 | ||
188 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
189 | { | |
190 | u64 extent_start; | |
191 | u64 extent_end; | |
192 | u64 bytenr; | |
1832a6d5 | 193 | u64 loops = 0; |
c31f8830 | 194 | u64 total_fs_bytes; |
be20aa9d | 195 | struct btrfs_root *root = BTRFS_I(inode)->root; |
a68d5933 | 196 | struct btrfs_block_group_cache *block_group; |
7ea394f1 | 197 | struct btrfs_trans_handle *trans; |
be20aa9d CM |
198 | struct extent_buffer *leaf; |
199 | int found_type; | |
200 | struct btrfs_path *path; | |
201 | struct btrfs_file_extent_item *item; | |
202 | int ret; | |
7ea394f1 | 203 | int err = 0; |
be20aa9d CM |
204 | struct btrfs_key found_key; |
205 | ||
c31f8830 | 206 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
207 | path = btrfs_alloc_path(); |
208 | BUG_ON(!path); | |
7ea394f1 YZ |
209 | trans = btrfs_join_transaction(root, 1); |
210 | BUG_ON(!trans); | |
be20aa9d CM |
211 | again: |
212 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
213 | inode->i_ino, start, 0); | |
214 | if (ret < 0) { | |
7ea394f1 YZ |
215 | err = ret; |
216 | goto out; | |
be20aa9d CM |
217 | } |
218 | ||
be20aa9d CM |
219 | if (ret != 0) { |
220 | if (path->slots[0] == 0) | |
221 | goto not_found; | |
222 | path->slots[0]--; | |
223 | } | |
224 | ||
225 | leaf = path->nodes[0]; | |
226 | item = btrfs_item_ptr(leaf, path->slots[0], | |
227 | struct btrfs_file_extent_item); | |
228 | ||
229 | /* are we inside the extent that was found? */ | |
230 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
231 | found_type = btrfs_key_type(&found_key); | |
232 | if (found_key.objectid != inode->i_ino || | |
bbaf549e | 233 | found_type != BTRFS_EXTENT_DATA_KEY) |
be20aa9d | 234 | goto not_found; |
be20aa9d CM |
235 | |
236 | found_type = btrfs_file_extent_type(leaf, item); | |
237 | extent_start = found_key.offset; | |
238 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
239 | u64 extent_num_bytes; |
240 | ||
241 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
242 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
243 | err = 0; |
244 | ||
1832a6d5 CM |
245 | if (loops && start != extent_start) |
246 | goto not_found; | |
247 | ||
be20aa9d CM |
248 | if (start < extent_start || start >= extent_end) |
249 | goto not_found; | |
250 | ||
be20aa9d CM |
251 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
252 | if (bytenr == 0) | |
253 | goto not_found; | |
254 | ||
7ea394f1 | 255 | if (btrfs_cross_ref_exists(trans, root, &found_key, bytenr)) |
a68d5933 | 256 | goto not_found; |
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 | ||
7ea394f1 YZ |
266 | bytenr += btrfs_file_extent_offset(leaf, item); |
267 | extent_num_bytes = min(end + 1, extent_end) - start; | |
268 | ret = btrfs_add_ordered_extent(inode, start, bytenr, | |
269 | extent_num_bytes, 1); | |
270 | if (ret) { | |
271 | err = ret; | |
272 | goto out; | |
273 | } | |
274 | ||
275 | btrfs_release_path(root, path); | |
be20aa9d | 276 | start = extent_end; |
7ea394f1 YZ |
277 | if (start <= end) { |
278 | loops++; | |
279 | goto again; | |
280 | } | |
bd09835d | 281 | } else { |
7ea394f1 YZ |
282 | not_found: |
283 | btrfs_end_transaction(trans, root); | |
be20aa9d | 284 | btrfs_free_path(path); |
7ea394f1 | 285 | return cow_file_range(inode, start, end); |
be20aa9d | 286 | } |
7ea394f1 YZ |
287 | out: |
288 | WARN_ON(err); | |
289 | btrfs_end_transaction(trans, root); | |
290 | btrfs_free_path(path); | |
291 | return err; | |
be20aa9d CM |
292 | } |
293 | ||
294 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
295 | { | |
296 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
297 | int ret; | |
a2135011 | 298 | |
b98b6767 Y |
299 | if (btrfs_test_opt(root, NODATACOW) || |
300 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
301 | ret = run_delalloc_nocow(inode, start, end); |
302 | else | |
303 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 304 | |
b888db2b CM |
305 | return ret; |
306 | } | |
307 | ||
291d673e | 308 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 309 | unsigned long old, unsigned long bits) |
291d673e | 310 | { |
bcbfce8a | 311 | unsigned long flags; |
b0c68f8b | 312 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 313 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a | 314 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
9069218d | 315 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e | 316 | root->fs_info->delalloc_bytes += end - start + 1; |
ea8c2819 CM |
317 | if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
318 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, | |
319 | &root->fs_info->delalloc_inodes); | |
320 | } | |
bcbfce8a | 321 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
322 | } |
323 | return 0; | |
324 | } | |
325 | ||
326 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 327 | unsigned long old, unsigned long bits) |
291d673e | 328 | { |
b0c68f8b | 329 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 330 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a CM |
331 | unsigned long flags; |
332 | ||
333 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
b0c68f8b CM |
334 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
335 | printk("warning: delalloc account %Lu %Lu\n", | |
336 | end - start + 1, root->fs_info->delalloc_bytes); | |
337 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 338 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
339 | } else { |
340 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 341 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 342 | } |
ea8c2819 CM |
343 | if (BTRFS_I(inode)->delalloc_bytes == 0 && |
344 | !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { | |
345 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); | |
346 | } | |
bcbfce8a | 347 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
348 | } |
349 | return 0; | |
350 | } | |
351 | ||
239b14b3 CM |
352 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
353 | size_t size, struct bio *bio) | |
354 | { | |
355 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
356 | struct btrfs_mapping_tree *map_tree; | |
239b14b3 | 357 | u64 logical = bio->bi_sector << 9; |
239b14b3 CM |
358 | u64 length = 0; |
359 | u64 map_length; | |
239b14b3 CM |
360 | int ret; |
361 | ||
f2d8d74d | 362 | length = bio->bi_size; |
239b14b3 CM |
363 | map_tree = &root->fs_info->mapping_tree; |
364 | map_length = length; | |
cea9e445 | 365 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 366 | &map_length, NULL, 0); |
cea9e445 | 367 | |
239b14b3 | 368 | if (map_length < length + size) { |
239b14b3 CM |
369 | return 1; |
370 | } | |
371 | return 0; | |
372 | } | |
373 | ||
44b8bd7e | 374 | int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
f188591e | 375 | int mirror_num) |
065631f6 | 376 | { |
065631f6 | 377 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 378 | int ret = 0; |
e015640f | 379 | |
3edf7d33 | 380 | ret = btrfs_csum_one_bio(root, inode, bio); |
44b8bd7e | 381 | BUG_ON(ret); |
e015640f | 382 | |
8b712842 | 383 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
44b8bd7e CM |
384 | } |
385 | ||
386 | int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, | |
387 | int mirror_num) | |
388 | { | |
389 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
390 | int ret = 0; | |
391 | ||
e6dcd2dc CM |
392 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); |
393 | BUG_ON(ret); | |
065631f6 | 394 | |
7ea394f1 YZ |
395 | if (btrfs_test_opt(root, NODATASUM) || |
396 | btrfs_test_flag(inode, NODATASUM)) { | |
397 | goto mapit; | |
398 | } | |
399 | ||
4d1b5fb4 CM |
400 | if (!(rw & (1 << BIO_RW))) { |
401 | btrfs_lookup_bio_sums(root, inode, bio); | |
402 | goto mapit; | |
403 | } | |
44b8bd7e CM |
404 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
405 | inode, rw, bio, mirror_num, | |
406 | __btrfs_submit_bio_hook); | |
0b86a832 | 407 | mapit: |
8b712842 | 408 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
065631f6 | 409 | } |
6885f308 | 410 | |
ba1da2f4 | 411 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
412 | struct inode *inode, u64 file_offset, |
413 | struct list_head *list) | |
414 | { | |
415 | struct list_head *cur; | |
416 | struct btrfs_ordered_sum *sum; | |
417 | ||
418 | btrfs_set_trans_block_group(trans, inode); | |
ba1da2f4 | 419 | list_for_each(cur, list) { |
e6dcd2dc | 420 | sum = list_entry(cur, struct btrfs_ordered_sum, list); |
e6dcd2dc CM |
421 | btrfs_csum_file_blocks(trans, BTRFS_I(inode)->root, |
422 | inode, sum); | |
e6dcd2dc CM |
423 | } |
424 | return 0; | |
425 | } | |
426 | ||
ea8c2819 CM |
427 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end) |
428 | { | |
429 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, | |
430 | GFP_NOFS); | |
431 | } | |
432 | ||
247e743c CM |
433 | struct btrfs_writepage_fixup { |
434 | struct page *page; | |
435 | struct btrfs_work work; | |
436 | }; | |
437 | ||
438 | /* see btrfs_writepage_start_hook for details on why this is required */ | |
439 | void btrfs_writepage_fixup_worker(struct btrfs_work *work) | |
440 | { | |
441 | struct btrfs_writepage_fixup *fixup; | |
442 | struct btrfs_ordered_extent *ordered; | |
443 | struct page *page; | |
444 | struct inode *inode; | |
445 | u64 page_start; | |
446 | u64 page_end; | |
447 | ||
448 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
449 | page = fixup->page; | |
4a096752 | 450 | again: |
247e743c CM |
451 | lock_page(page); |
452 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
453 | ClearPageChecked(page); | |
454 | goto out_page; | |
455 | } | |
456 | ||
457 | inode = page->mapping->host; | |
458 | page_start = page_offset(page); | |
459 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
460 | ||
461 | lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); | |
4a096752 CM |
462 | |
463 | /* already ordered? We're done */ | |
464 | if (test_range_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, | |
465 | EXTENT_ORDERED, 0)) { | |
247e743c | 466 | goto out; |
4a096752 CM |
467 | } |
468 | ||
469 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
470 | if (ordered) { | |
471 | unlock_extent(&BTRFS_I(inode)->io_tree, page_start, | |
472 | page_end, GFP_NOFS); | |
473 | unlock_page(page); | |
474 | btrfs_start_ordered_extent(inode, ordered, 1); | |
475 | goto again; | |
476 | } | |
247e743c | 477 | |
ea8c2819 | 478 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
247e743c CM |
479 | ClearPageChecked(page); |
480 | out: | |
481 | unlock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); | |
482 | out_page: | |
483 | unlock_page(page); | |
484 | page_cache_release(page); | |
485 | } | |
486 | ||
487 | /* | |
488 | * There are a few paths in the higher layers of the kernel that directly | |
489 | * set the page dirty bit without asking the filesystem if it is a | |
490 | * good idea. This causes problems because we want to make sure COW | |
491 | * properly happens and the data=ordered rules are followed. | |
492 | * | |
493 | * In our case any range that doesn't have the EXTENT_ORDERED bit set | |
494 | * hasn't been properly setup for IO. We kick off an async process | |
495 | * to fix it up. The async helper will wait for ordered extents, set | |
496 | * the delalloc bit and make it safe to write the page. | |
497 | */ | |
498 | int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) | |
499 | { | |
500 | struct inode *inode = page->mapping->host; | |
501 | struct btrfs_writepage_fixup *fixup; | |
502 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
503 | int ret; | |
504 | ||
505 | ret = test_range_bit(&BTRFS_I(inode)->io_tree, start, end, | |
506 | EXTENT_ORDERED, 0); | |
507 | if (ret) | |
508 | return 0; | |
509 | ||
510 | if (PageChecked(page)) | |
511 | return -EAGAIN; | |
512 | ||
513 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
514 | if (!fixup) | |
515 | return -EAGAIN; | |
f421950f | 516 | |
247e743c CM |
517 | SetPageChecked(page); |
518 | page_cache_get(page); | |
519 | fixup->work.func = btrfs_writepage_fixup_worker; | |
520 | fixup->page = page; | |
521 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); | |
522 | return -EAGAIN; | |
523 | } | |
524 | ||
211f90e6 | 525 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) |
e6dcd2dc | 526 | { |
e6dcd2dc CM |
527 | struct btrfs_root *root = BTRFS_I(inode)->root; |
528 | struct btrfs_trans_handle *trans; | |
529 | struct btrfs_ordered_extent *ordered_extent; | |
530 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
31840ae1 ZY |
531 | struct btrfs_file_extent_item *extent_item; |
532 | struct btrfs_path *path = NULL; | |
533 | struct extent_buffer *leaf; | |
e6dcd2dc CM |
534 | u64 alloc_hint = 0; |
535 | struct list_head list; | |
536 | struct btrfs_key ins; | |
537 | int ret; | |
538 | ||
539 | ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1); | |
ba1da2f4 | 540 | if (!ret) |
e6dcd2dc | 541 | return 0; |
e6dcd2dc | 542 | |
f9295749 | 543 | trans = btrfs_join_transaction(root, 1); |
e6dcd2dc CM |
544 | |
545 | ordered_extent = btrfs_lookup_ordered_extent(inode, start); | |
546 | BUG_ON(!ordered_extent); | |
7ea394f1 YZ |
547 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) |
548 | goto nocow; | |
e6dcd2dc | 549 | |
31840ae1 ZY |
550 | path = btrfs_alloc_path(); |
551 | BUG_ON(!path); | |
552 | ||
e6dcd2dc CM |
553 | lock_extent(io_tree, ordered_extent->file_offset, |
554 | ordered_extent->file_offset + ordered_extent->len - 1, | |
555 | GFP_NOFS); | |
556 | ||
557 | INIT_LIST_HEAD(&list); | |
558 | ||
ee6e6504 | 559 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
e5a2217e | 560 | |
e6dcd2dc CM |
561 | ret = btrfs_drop_extents(trans, root, inode, |
562 | ordered_extent->file_offset, | |
563 | ordered_extent->file_offset + | |
564 | ordered_extent->len, | |
565 | ordered_extent->file_offset, &alloc_hint); | |
566 | BUG_ON(ret); | |
31840ae1 ZY |
567 | |
568 | ins.objectid = inode->i_ino; | |
569 | ins.offset = ordered_extent->file_offset; | |
570 | ins.type = BTRFS_EXTENT_DATA_KEY; | |
571 | ret = btrfs_insert_empty_item(trans, root, path, &ins, | |
572 | sizeof(*extent_item)); | |
e6dcd2dc | 573 | BUG_ON(ret); |
31840ae1 ZY |
574 | leaf = path->nodes[0]; |
575 | extent_item = btrfs_item_ptr(leaf, path->slots[0], | |
576 | struct btrfs_file_extent_item); | |
577 | btrfs_set_file_extent_generation(leaf, extent_item, trans->transid); | |
578 | btrfs_set_file_extent_type(leaf, extent_item, BTRFS_FILE_EXTENT_REG); | |
579 | btrfs_set_file_extent_disk_bytenr(leaf, extent_item, | |
580 | ordered_extent->start); | |
581 | btrfs_set_file_extent_disk_num_bytes(leaf, extent_item, | |
582 | ordered_extent->len); | |
583 | btrfs_set_file_extent_offset(leaf, extent_item, 0); | |
584 | btrfs_set_file_extent_num_bytes(leaf, extent_item, | |
585 | ordered_extent->len); | |
586 | btrfs_mark_buffer_dirty(leaf); | |
7f3c74fb | 587 | |
e6dcd2dc CM |
588 | btrfs_drop_extent_cache(inode, ordered_extent->file_offset, |
589 | ordered_extent->file_offset + | |
590 | ordered_extent->len - 1); | |
ee6e6504 CM |
591 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
592 | ||
31840ae1 ZY |
593 | ins.objectid = ordered_extent->start; |
594 | ins.offset = ordered_extent->len; | |
595 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
596 | ret = btrfs_alloc_reserved_extent(trans, root, leaf->start, | |
597 | root->root_key.objectid, | |
598 | trans->transid, inode->i_ino, | |
599 | ordered_extent->file_offset, &ins); | |
600 | BUG_ON(ret); | |
601 | btrfs_release_path(root, path); | |
602 | ||
e6dcd2dc CM |
603 | inode->i_blocks += ordered_extent->len >> 9; |
604 | unlock_extent(io_tree, ordered_extent->file_offset, | |
605 | ordered_extent->file_offset + ordered_extent->len - 1, | |
606 | GFP_NOFS); | |
7ea394f1 | 607 | nocow: |
e6dcd2dc CM |
608 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
609 | &ordered_extent->list); | |
610 | ||
34353029 | 611 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
dbe674a9 | 612 | btrfs_ordered_update_i_size(inode, ordered_extent); |
e02119d5 | 613 | btrfs_update_inode(trans, root, inode); |
e6dcd2dc | 614 | btrfs_remove_ordered_extent(inode, ordered_extent); |
34353029 | 615 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
7f3c74fb | 616 | |
e6dcd2dc CM |
617 | /* once for us */ |
618 | btrfs_put_ordered_extent(ordered_extent); | |
619 | /* once for the tree */ | |
620 | btrfs_put_ordered_extent(ordered_extent); | |
621 | ||
e6dcd2dc | 622 | btrfs_end_transaction(trans, root); |
31840ae1 ZY |
623 | if (path) |
624 | btrfs_free_path(path); | |
e6dcd2dc CM |
625 | return 0; |
626 | } | |
627 | ||
211f90e6 CM |
628 | int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
629 | struct extent_state *state, int uptodate) | |
630 | { | |
631 | return btrfs_finish_ordered_io(page->mapping->host, start, end); | |
632 | } | |
633 | ||
7e38326f CM |
634 | struct io_failure_record { |
635 | struct page *page; | |
636 | u64 start; | |
637 | u64 len; | |
638 | u64 logical; | |
639 | int last_mirror; | |
640 | }; | |
641 | ||
1259ab75 CM |
642 | int btrfs_io_failed_hook(struct bio *failed_bio, |
643 | struct page *page, u64 start, u64 end, | |
644 | struct extent_state *state) | |
7e38326f CM |
645 | { |
646 | struct io_failure_record *failrec = NULL; | |
647 | u64 private; | |
648 | struct extent_map *em; | |
649 | struct inode *inode = page->mapping->host; | |
650 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
3b951516 | 651 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
7e38326f CM |
652 | struct bio *bio; |
653 | int num_copies; | |
654 | int ret; | |
1259ab75 | 655 | int rw; |
7e38326f CM |
656 | u64 logical; |
657 | ||
658 | ret = get_state_private(failure_tree, start, &private); | |
659 | if (ret) { | |
7e38326f CM |
660 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); |
661 | if (!failrec) | |
662 | return -ENOMEM; | |
663 | failrec->start = start; | |
664 | failrec->len = end - start + 1; | |
665 | failrec->last_mirror = 0; | |
666 | ||
3b951516 CM |
667 | spin_lock(&em_tree->lock); |
668 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
669 | if (em->start > start || em->start + em->len < start) { | |
670 | free_extent_map(em); | |
671 | em = NULL; | |
672 | } | |
673 | spin_unlock(&em_tree->lock); | |
7e38326f CM |
674 | |
675 | if (!em || IS_ERR(em)) { | |
676 | kfree(failrec); | |
677 | return -EIO; | |
678 | } | |
679 | logical = start - em->start; | |
680 | logical = em->block_start + logical; | |
681 | failrec->logical = logical; | |
682 | free_extent_map(em); | |
683 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | | |
684 | EXTENT_DIRTY, GFP_NOFS); | |
587f7704 CM |
685 | set_state_private(failure_tree, start, |
686 | (u64)(unsigned long)failrec); | |
7e38326f | 687 | } else { |
587f7704 | 688 | failrec = (struct io_failure_record *)(unsigned long)private; |
7e38326f CM |
689 | } |
690 | num_copies = btrfs_num_copies( | |
691 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
692 | failrec->logical, failrec->len); | |
693 | failrec->last_mirror++; | |
694 | if (!state) { | |
695 | spin_lock_irq(&BTRFS_I(inode)->io_tree.lock); | |
696 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
697 | failrec->start, | |
698 | EXTENT_LOCKED); | |
699 | if (state && state->start != failrec->start) | |
700 | state = NULL; | |
701 | spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock); | |
702 | } | |
703 | if (!state || failrec->last_mirror > num_copies) { | |
704 | set_state_private(failure_tree, failrec->start, 0); | |
705 | clear_extent_bits(failure_tree, failrec->start, | |
706 | failrec->start + failrec->len - 1, | |
707 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
708 | kfree(failrec); | |
709 | return -EIO; | |
710 | } | |
711 | bio = bio_alloc(GFP_NOFS, 1); | |
712 | bio->bi_private = state; | |
713 | bio->bi_end_io = failed_bio->bi_end_io; | |
714 | bio->bi_sector = failrec->logical >> 9; | |
715 | bio->bi_bdev = failed_bio->bi_bdev; | |
e1c4b745 | 716 | bio->bi_size = 0; |
7e38326f | 717 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
1259ab75 CM |
718 | if (failed_bio->bi_rw & (1 << BIO_RW)) |
719 | rw = WRITE; | |
720 | else | |
721 | rw = READ; | |
722 | ||
723 | BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio, | |
724 | failrec->last_mirror); | |
725 | return 0; | |
726 | } | |
727 | ||
728 | int btrfs_clean_io_failures(struct inode *inode, u64 start) | |
729 | { | |
730 | u64 private; | |
731 | u64 private_failure; | |
732 | struct io_failure_record *failure; | |
733 | int ret; | |
734 | ||
735 | private = 0; | |
736 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
737 | (u64)-1, 1, EXTENT_DIRTY)) { | |
738 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, | |
739 | start, &private_failure); | |
740 | if (ret == 0) { | |
741 | failure = (struct io_failure_record *)(unsigned long) | |
742 | private_failure; | |
743 | set_state_private(&BTRFS_I(inode)->io_failure_tree, | |
744 | failure->start, 0); | |
745 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, | |
746 | failure->start, | |
747 | failure->start + failure->len - 1, | |
748 | EXTENT_DIRTY | EXTENT_LOCKED, | |
749 | GFP_NOFS); | |
750 | kfree(failure); | |
751 | } | |
752 | } | |
7e38326f CM |
753 | return 0; |
754 | } | |
755 | ||
70dec807 CM |
756 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
757 | struct extent_state *state) | |
07157aac | 758 | { |
35ebb934 | 759 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 760 | struct inode *inode = page->mapping->host; |
d1310b2e | 761 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 762 | char *kaddr; |
aadfeb6e | 763 | u64 private = ~(u32)0; |
07157aac | 764 | int ret; |
ff79f819 CM |
765 | struct btrfs_root *root = BTRFS_I(inode)->root; |
766 | u32 csum = ~(u32)0; | |
bbf0d006 | 767 | unsigned long flags; |
d1310b2e | 768 | |
b98b6767 Y |
769 | if (btrfs_test_opt(root, NODATASUM) || |
770 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 771 | return 0; |
c2e639f0 | 772 | if (state && state->start == start) { |
70dec807 CM |
773 | private = state->private; |
774 | ret = 0; | |
775 | } else { | |
776 | ret = get_state_private(io_tree, start, &private); | |
777 | } | |
bbf0d006 | 778 | local_irq_save(flags); |
07157aac CM |
779 | kaddr = kmap_atomic(page, KM_IRQ0); |
780 | if (ret) { | |
781 | goto zeroit; | |
782 | } | |
ff79f819 CM |
783 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
784 | btrfs_csum_final(csum, (char *)&csum); | |
785 | if (csum != private) { | |
07157aac CM |
786 | goto zeroit; |
787 | } | |
788 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 789 | local_irq_restore(flags); |
7e38326f CM |
790 | |
791 | /* if the io failure tree for this inode is non-empty, | |
792 | * check to see if we've recovered from a failed IO | |
793 | */ | |
1259ab75 | 794 | btrfs_clean_io_failures(inode, start); |
07157aac CM |
795 | return 0; |
796 | ||
797 | zeroit: | |
aadfeb6e CM |
798 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
799 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
800 | private); | |
db94535d CM |
801 | memset(kaddr + offset, 1, end - start + 1); |
802 | flush_dcache_page(page); | |
07157aac | 803 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 804 | local_irq_restore(flags); |
3b951516 CM |
805 | if (private == 0) |
806 | return 0; | |
7e38326f | 807 | return -EIO; |
07157aac | 808 | } |
b888db2b | 809 | |
7b128766 JB |
810 | /* |
811 | * This creates an orphan entry for the given inode in case something goes | |
812 | * wrong in the middle of an unlink/truncate. | |
813 | */ | |
814 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
815 | { | |
816 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
817 | int ret = 0; | |
818 | ||
bcc63abb | 819 | spin_lock(&root->list_lock); |
7b128766 JB |
820 | |
821 | /* already on the orphan list, we're good */ | |
822 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { | |
bcc63abb | 823 | spin_unlock(&root->list_lock); |
7b128766 JB |
824 | return 0; |
825 | } | |
826 | ||
827 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); | |
828 | ||
bcc63abb | 829 | spin_unlock(&root->list_lock); |
7b128766 JB |
830 | |
831 | /* | |
832 | * insert an orphan item to track this unlinked/truncated file | |
833 | */ | |
834 | ret = btrfs_insert_orphan_item(trans, root, inode->i_ino); | |
835 | ||
836 | return ret; | |
837 | } | |
838 | ||
839 | /* | |
840 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
841 | * item for this particular inode. | |
842 | */ | |
843 | int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) | |
844 | { | |
845 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
846 | int ret = 0; | |
847 | ||
bcc63abb | 848 | spin_lock(&root->list_lock); |
7b128766 JB |
849 | |
850 | if (list_empty(&BTRFS_I(inode)->i_orphan)) { | |
bcc63abb | 851 | spin_unlock(&root->list_lock); |
7b128766 JB |
852 | return 0; |
853 | } | |
854 | ||
855 | list_del_init(&BTRFS_I(inode)->i_orphan); | |
856 | if (!trans) { | |
bcc63abb | 857 | spin_unlock(&root->list_lock); |
7b128766 JB |
858 | return 0; |
859 | } | |
860 | ||
bcc63abb | 861 | spin_unlock(&root->list_lock); |
7b128766 JB |
862 | |
863 | ret = btrfs_del_orphan_item(trans, root, inode->i_ino); | |
864 | ||
865 | return ret; | |
866 | } | |
867 | ||
868 | /* | |
869 | * this cleans up any orphans that may be left on the list from the last use | |
870 | * of this root. | |
871 | */ | |
872 | void btrfs_orphan_cleanup(struct btrfs_root *root) | |
873 | { | |
874 | struct btrfs_path *path; | |
875 | struct extent_buffer *leaf; | |
876 | struct btrfs_item *item; | |
877 | struct btrfs_key key, found_key; | |
878 | struct btrfs_trans_handle *trans; | |
879 | struct inode *inode; | |
880 | int ret = 0, nr_unlink = 0, nr_truncate = 0; | |
881 | ||
882 | /* don't do orphan cleanup if the fs is readonly. */ | |
883 | if (root->inode->i_sb->s_flags & MS_RDONLY) | |
884 | return; | |
885 | ||
886 | path = btrfs_alloc_path(); | |
887 | if (!path) | |
888 | return; | |
889 | path->reada = -1; | |
890 | ||
891 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
892 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); | |
893 | key.offset = (u64)-1; | |
894 | ||
895 | trans = btrfs_start_transaction(root, 1); | |
896 | btrfs_set_trans_block_group(trans, root->inode); | |
897 | ||
898 | while (1) { | |
899 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
900 | if (ret < 0) { | |
901 | printk(KERN_ERR "Error searching slot for orphan: %d" | |
902 | "\n", ret); | |
903 | break; | |
904 | } | |
905 | ||
906 | /* | |
907 | * if ret == 0 means we found what we were searching for, which | |
908 | * is weird, but possible, so only screw with path if we didnt | |
909 | * find the key and see if we have stuff that matches | |
910 | */ | |
911 | if (ret > 0) { | |
912 | if (path->slots[0] == 0) | |
913 | break; | |
914 | path->slots[0]--; | |
915 | } | |
916 | ||
917 | /* pull out the item */ | |
918 | leaf = path->nodes[0]; | |
919 | item = btrfs_item_nr(leaf, path->slots[0]); | |
920 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
921 | ||
922 | /* make sure the item matches what we want */ | |
923 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
924 | break; | |
925 | if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY) | |
926 | break; | |
927 | ||
928 | /* release the path since we're done with it */ | |
929 | btrfs_release_path(root, path); | |
930 | ||
931 | /* | |
932 | * this is where we are basically btrfs_lookup, without the | |
933 | * crossing root thing. we store the inode number in the | |
934 | * offset of the orphan item. | |
935 | */ | |
936 | inode = btrfs_iget_locked(root->inode->i_sb, | |
937 | found_key.offset, root); | |
938 | if (!inode) | |
939 | break; | |
940 | ||
941 | if (inode->i_state & I_NEW) { | |
942 | BTRFS_I(inode)->root = root; | |
943 | ||
944 | /* have to set the location manually */ | |
945 | BTRFS_I(inode)->location.objectid = inode->i_ino; | |
946 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
947 | BTRFS_I(inode)->location.offset = 0; | |
948 | ||
949 | btrfs_read_locked_inode(inode); | |
950 | unlock_new_inode(inode); | |
951 | } | |
952 | ||
953 | /* | |
954 | * add this inode to the orphan list so btrfs_orphan_del does | |
955 | * the proper thing when we hit it | |
956 | */ | |
bcc63abb | 957 | spin_lock(&root->list_lock); |
7b128766 | 958 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); |
bcc63abb | 959 | spin_unlock(&root->list_lock); |
7b128766 JB |
960 | |
961 | /* | |
962 | * if this is a bad inode, means we actually succeeded in | |
963 | * removing the inode, but not the orphan record, which means | |
964 | * we need to manually delete the orphan since iput will just | |
965 | * do a destroy_inode | |
966 | */ | |
967 | if (is_bad_inode(inode)) { | |
968 | btrfs_orphan_del(trans, inode); | |
969 | iput(inode); | |
970 | continue; | |
971 | } | |
972 | ||
973 | /* if we have links, this was a truncate, lets do that */ | |
974 | if (inode->i_nlink) { | |
975 | nr_truncate++; | |
976 | btrfs_truncate(inode); | |
977 | } else { | |
978 | nr_unlink++; | |
979 | } | |
980 | ||
981 | /* this will do delete_inode and everything for us */ | |
982 | iput(inode); | |
983 | } | |
984 | ||
985 | if (nr_unlink) | |
986 | printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); | |
987 | if (nr_truncate) | |
988 | printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); | |
989 | ||
990 | btrfs_free_path(path); | |
991 | btrfs_end_transaction(trans, root); | |
992 | } | |
993 | ||
39279cc3 CM |
994 | void btrfs_read_locked_inode(struct inode *inode) |
995 | { | |
996 | struct btrfs_path *path; | |
5f39d397 | 997 | struct extent_buffer *leaf; |
39279cc3 | 998 | struct btrfs_inode_item *inode_item; |
0b86a832 | 999 | struct btrfs_timespec *tspec; |
39279cc3 CM |
1000 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1001 | struct btrfs_key location; | |
1002 | u64 alloc_group_block; | |
618e21d5 | 1003 | u32 rdev; |
39279cc3 CM |
1004 | int ret; |
1005 | ||
1006 | path = btrfs_alloc_path(); | |
1007 | BUG_ON(!path); | |
39279cc3 | 1008 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 1009 | |
39279cc3 | 1010 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 1011 | if (ret) |
39279cc3 | 1012 | goto make_bad; |
39279cc3 | 1013 | |
5f39d397 CM |
1014 | leaf = path->nodes[0]; |
1015 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
1016 | struct btrfs_inode_item); | |
1017 | ||
1018 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
1019 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
1020 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
1021 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
dbe674a9 | 1022 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 CM |
1023 | |
1024 | tspec = btrfs_inode_atime(inode_item); | |
1025 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
1026 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
1027 | ||
1028 | tspec = btrfs_inode_mtime(inode_item); | |
1029 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
1030 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
1031 | ||
1032 | tspec = btrfs_inode_ctime(inode_item); | |
1033 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
1034 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
1035 | ||
1036 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
e02119d5 CM |
1037 | BTRFS_I(inode)->generation = btrfs_inode_generation(leaf, inode_item); |
1038 | inode->i_generation = BTRFS_I(inode)->generation; | |
618e21d5 | 1039 | inode->i_rdev = 0; |
5f39d397 CM |
1040 | rdev = btrfs_inode_rdev(leaf, inode_item); |
1041 | ||
aec7477b JB |
1042 | BTRFS_I(inode)->index_cnt = (u64)-1; |
1043 | ||
5f39d397 | 1044 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); |
39279cc3 CM |
1045 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
1046 | alloc_group_block); | |
b98b6767 | 1047 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
1048 | if (!BTRFS_I(inode)->block_group) { |
1049 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
0b86a832 CM |
1050 | NULL, 0, |
1051 | BTRFS_BLOCK_GROUP_METADATA, 0); | |
e52ec0eb | 1052 | } |
39279cc3 CM |
1053 | btrfs_free_path(path); |
1054 | inode_item = NULL; | |
1055 | ||
39279cc3 | 1056 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
1057 | case S_IFREG: |
1058 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 1059 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 1060 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1061 | inode->i_fop = &btrfs_file_operations; |
1062 | inode->i_op = &btrfs_file_inode_operations; | |
1063 | break; | |
1064 | case S_IFDIR: | |
1065 | inode->i_fop = &btrfs_dir_file_operations; | |
1066 | if (root == root->fs_info->tree_root) | |
1067 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
1068 | else | |
1069 | inode->i_op = &btrfs_dir_inode_operations; | |
1070 | break; | |
1071 | case S_IFLNK: | |
1072 | inode->i_op = &btrfs_symlink_inode_operations; | |
1073 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 1074 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 1075 | break; |
618e21d5 JB |
1076 | default: |
1077 | init_special_inode(inode, inode->i_mode, rdev); | |
1078 | break; | |
39279cc3 CM |
1079 | } |
1080 | return; | |
1081 | ||
1082 | make_bad: | |
39279cc3 | 1083 | btrfs_free_path(path); |
39279cc3 CM |
1084 | make_bad_inode(inode); |
1085 | } | |
1086 | ||
e02119d5 CM |
1087 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
1088 | struct extent_buffer *leaf, | |
5f39d397 | 1089 | struct btrfs_inode_item *item, |
39279cc3 CM |
1090 | struct inode *inode) |
1091 | { | |
5f39d397 CM |
1092 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
1093 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
dbe674a9 | 1094 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
5f39d397 CM |
1095 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
1096 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
1097 | ||
1098 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
1099 | inode->i_atime.tv_sec); | |
1100 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
1101 | inode->i_atime.tv_nsec); | |
1102 | ||
1103 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
1104 | inode->i_mtime.tv_sec); | |
1105 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
1106 | inode->i_mtime.tv_nsec); | |
1107 | ||
1108 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
1109 | inode->i_ctime.tv_sec); | |
1110 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
1111 | inode->i_ctime.tv_nsec); | |
1112 | ||
1113 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
e02119d5 CM |
1114 | btrfs_set_inode_generation(leaf, item, BTRFS_I(inode)->generation); |
1115 | btrfs_set_inode_transid(leaf, item, trans->transid); | |
5f39d397 | 1116 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); |
b98b6767 | 1117 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 1118 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
1119 | BTRFS_I(inode)->block_group->key.objectid); |
1120 | } | |
1121 | ||
ba1da2f4 | 1122 | int noinline btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
1123 | struct btrfs_root *root, |
1124 | struct inode *inode) | |
1125 | { | |
1126 | struct btrfs_inode_item *inode_item; | |
1127 | struct btrfs_path *path; | |
5f39d397 | 1128 | struct extent_buffer *leaf; |
39279cc3 CM |
1129 | int ret; |
1130 | ||
1131 | path = btrfs_alloc_path(); | |
1132 | BUG_ON(!path); | |
39279cc3 CM |
1133 | ret = btrfs_lookup_inode(trans, root, path, |
1134 | &BTRFS_I(inode)->location, 1); | |
1135 | if (ret) { | |
1136 | if (ret > 0) | |
1137 | ret = -ENOENT; | |
1138 | goto failed; | |
1139 | } | |
1140 | ||
5f39d397 CM |
1141 | leaf = path->nodes[0]; |
1142 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
1143 | struct btrfs_inode_item); |
1144 | ||
e02119d5 | 1145 | fill_inode_item(trans, leaf, inode_item, inode); |
5f39d397 | 1146 | btrfs_mark_buffer_dirty(leaf); |
15ee9bc7 | 1147 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
1148 | ret = 0; |
1149 | failed: | |
39279cc3 CM |
1150 | btrfs_free_path(path); |
1151 | return ret; | |
1152 | } | |
1153 | ||
1154 | ||
e02119d5 CM |
1155 | int btrfs_unlink_inode(struct btrfs_trans_handle *trans, |
1156 | struct btrfs_root *root, | |
1157 | struct inode *dir, struct inode *inode, | |
1158 | const char *name, int name_len) | |
39279cc3 CM |
1159 | { |
1160 | struct btrfs_path *path; | |
39279cc3 | 1161 | int ret = 0; |
5f39d397 | 1162 | struct extent_buffer *leaf; |
39279cc3 | 1163 | struct btrfs_dir_item *di; |
5f39d397 | 1164 | struct btrfs_key key; |
aec7477b | 1165 | u64 index; |
39279cc3 CM |
1166 | |
1167 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
1168 | if (!path) { |
1169 | ret = -ENOMEM; | |
1170 | goto err; | |
1171 | } | |
1172 | ||
39279cc3 CM |
1173 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
1174 | name, name_len, -1); | |
1175 | if (IS_ERR(di)) { | |
1176 | ret = PTR_ERR(di); | |
1177 | goto err; | |
1178 | } | |
1179 | if (!di) { | |
1180 | ret = -ENOENT; | |
1181 | goto err; | |
1182 | } | |
5f39d397 CM |
1183 | leaf = path->nodes[0]; |
1184 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 1185 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
1186 | if (ret) |
1187 | goto err; | |
39279cc3 CM |
1188 | btrfs_release_path(root, path); |
1189 | ||
aec7477b | 1190 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
e02119d5 CM |
1191 | inode->i_ino, |
1192 | dir->i_ino, &index); | |
aec7477b JB |
1193 | if (ret) { |
1194 | printk("failed to delete reference to %.*s, " | |
1195 | "inode %lu parent %lu\n", name_len, name, | |
e02119d5 | 1196 | inode->i_ino, dir->i_ino); |
aec7477b JB |
1197 | goto err; |
1198 | } | |
1199 | ||
39279cc3 | 1200 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
aec7477b | 1201 | index, name, name_len, -1); |
39279cc3 CM |
1202 | if (IS_ERR(di)) { |
1203 | ret = PTR_ERR(di); | |
1204 | goto err; | |
1205 | } | |
1206 | if (!di) { | |
1207 | ret = -ENOENT; | |
1208 | goto err; | |
1209 | } | |
1210 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
925baedd | 1211 | btrfs_release_path(root, path); |
39279cc3 | 1212 | |
e02119d5 CM |
1213 | ret = btrfs_del_inode_ref_in_log(trans, root, name, name_len, |
1214 | inode, dir->i_ino); | |
49eb7e46 CM |
1215 | BUG_ON(ret != 0 && ret != -ENOENT); |
1216 | if (ret != -ENOENT) | |
1217 | BTRFS_I(dir)->log_dirty_trans = trans->transid; | |
e02119d5 CM |
1218 | |
1219 | ret = btrfs_del_dir_entries_in_log(trans, root, name, name_len, | |
1220 | dir, index); | |
1221 | BUG_ON(ret); | |
39279cc3 CM |
1222 | err: |
1223 | btrfs_free_path(path); | |
e02119d5 CM |
1224 | if (ret) |
1225 | goto out; | |
1226 | ||
1227 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); | |
1228 | inode->i_ctime = dir->i_mtime = dir->i_ctime = CURRENT_TIME; | |
1229 | btrfs_update_inode(trans, root, dir); | |
1230 | btrfs_drop_nlink(inode); | |
1231 | ret = btrfs_update_inode(trans, root, inode); | |
1232 | dir->i_sb->s_dirt = 1; | |
1233 | out: | |
39279cc3 CM |
1234 | return ret; |
1235 | } | |
1236 | ||
1237 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
1238 | { | |
1239 | struct btrfs_root *root; | |
1240 | struct btrfs_trans_handle *trans; | |
7b128766 | 1241 | struct inode *inode = dentry->d_inode; |
39279cc3 | 1242 | int ret; |
1832a6d5 | 1243 | unsigned long nr = 0; |
39279cc3 CM |
1244 | |
1245 | root = BTRFS_I(dir)->root; | |
1832a6d5 CM |
1246 | |
1247 | ret = btrfs_check_free_space(root, 1, 1); | |
1248 | if (ret) | |
1249 | goto fail; | |
1250 | ||
39279cc3 | 1251 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1252 | |
39279cc3 | 1253 | btrfs_set_trans_block_group(trans, dir); |
e02119d5 CM |
1254 | ret = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
1255 | dentry->d_name.name, dentry->d_name.len); | |
7b128766 JB |
1256 | |
1257 | if (inode->i_nlink == 0) | |
1258 | ret = btrfs_orphan_add(trans, inode); | |
1259 | ||
d3c2fdcf | 1260 | nr = trans->blocks_used; |
5f39d397 | 1261 | |
89ce8a63 | 1262 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 1263 | fail: |
d3c2fdcf | 1264 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1265 | return ret; |
1266 | } | |
1267 | ||
1268 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
1269 | { | |
1270 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 1271 | int err = 0; |
39279cc3 CM |
1272 | int ret; |
1273 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 1274 | struct btrfs_trans_handle *trans; |
1832a6d5 | 1275 | unsigned long nr = 0; |
39279cc3 | 1276 | |
925baedd | 1277 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) { |
134d4512 | 1278 | return -ENOTEMPTY; |
925baedd | 1279 | } |
134d4512 | 1280 | |
1832a6d5 CM |
1281 | ret = btrfs_check_free_space(root, 1, 1); |
1282 | if (ret) | |
1283 | goto fail; | |
1284 | ||
39279cc3 CM |
1285 | trans = btrfs_start_transaction(root, 1); |
1286 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 | 1287 | |
7b128766 JB |
1288 | err = btrfs_orphan_add(trans, inode); |
1289 | if (err) | |
1290 | goto fail_trans; | |
1291 | ||
39279cc3 | 1292 | /* now the directory is empty */ |
e02119d5 CM |
1293 | err = btrfs_unlink_inode(trans, root, dir, dentry->d_inode, |
1294 | dentry->d_name.name, dentry->d_name.len); | |
39279cc3 | 1295 | if (!err) { |
dbe674a9 | 1296 | btrfs_i_size_write(inode, 0); |
39279cc3 | 1297 | } |
3954401f | 1298 | |
7b128766 | 1299 | fail_trans: |
d3c2fdcf | 1300 | nr = trans->blocks_used; |
89ce8a63 | 1301 | ret = btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 1302 | fail: |
d3c2fdcf | 1303 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 1304 | |
39279cc3 CM |
1305 | if (ret && !err) |
1306 | err = ret; | |
1307 | return err; | |
1308 | } | |
1309 | ||
39279cc3 CM |
1310 | /* |
1311 | * this can truncate away extent items, csum items and directory items. | |
1312 | * It starts at a high offset and removes keys until it can't find | |
1313 | * any higher than i_size. | |
1314 | * | |
1315 | * csum items that cross the new i_size are truncated to the new size | |
1316 | * as well. | |
7b128766 JB |
1317 | * |
1318 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
1319 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 | 1320 | */ |
e02119d5 CM |
1321 | noinline int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, |
1322 | struct btrfs_root *root, | |
1323 | struct inode *inode, | |
1324 | u64 new_size, u32 min_type) | |
39279cc3 CM |
1325 | { |
1326 | int ret; | |
1327 | struct btrfs_path *path; | |
1328 | struct btrfs_key key; | |
5f39d397 | 1329 | struct btrfs_key found_key; |
39279cc3 | 1330 | u32 found_type; |
5f39d397 | 1331 | struct extent_buffer *leaf; |
39279cc3 CM |
1332 | struct btrfs_file_extent_item *fi; |
1333 | u64 extent_start = 0; | |
db94535d | 1334 | u64 extent_num_bytes = 0; |
39279cc3 | 1335 | u64 item_end = 0; |
7bb86316 | 1336 | u64 root_gen = 0; |
d8d5f3e1 | 1337 | u64 root_owner = 0; |
39279cc3 CM |
1338 | int found_extent; |
1339 | int del_item; | |
85e21bac CM |
1340 | int pending_del_nr = 0; |
1341 | int pending_del_slot = 0; | |
179e29e4 | 1342 | int extent_type = -1; |
3b951516 | 1343 | u64 mask = root->sectorsize - 1; |
39279cc3 | 1344 | |
e02119d5 CM |
1345 | if (root->ref_cows) |
1346 | btrfs_drop_extent_cache(inode, | |
1347 | new_size & (~mask), (u64)-1); | |
39279cc3 | 1348 | path = btrfs_alloc_path(); |
3c69faec | 1349 | path->reada = -1; |
39279cc3 | 1350 | BUG_ON(!path); |
5f39d397 | 1351 | |
39279cc3 CM |
1352 | /* FIXME, add redo link to tree so we don't leak on crash */ |
1353 | key.objectid = inode->i_ino; | |
1354 | key.offset = (u64)-1; | |
5f39d397 CM |
1355 | key.type = (u8)-1; |
1356 | ||
85e21bac CM |
1357 | btrfs_init_path(path); |
1358 | search_again: | |
1359 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1360 | if (ret < 0) { | |
1361 | goto error; | |
1362 | } | |
1363 | if (ret > 0) { | |
e02119d5 CM |
1364 | /* there are no items in the tree for us to truncate, we're |
1365 | * done | |
1366 | */ | |
1367 | if (path->slots[0] == 0) { | |
1368 | ret = 0; | |
1369 | goto error; | |
1370 | } | |
85e21bac CM |
1371 | path->slots[0]--; |
1372 | } | |
1373 | ||
39279cc3 | 1374 | while(1) { |
39279cc3 | 1375 | fi = NULL; |
5f39d397 CM |
1376 | leaf = path->nodes[0]; |
1377 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1378 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 1379 | |
5f39d397 | 1380 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 1381 | break; |
5f39d397 | 1382 | |
85e21bac | 1383 | if (found_type < min_type) |
39279cc3 CM |
1384 | break; |
1385 | ||
5f39d397 | 1386 | item_end = found_key.offset; |
39279cc3 | 1387 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 1388 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 1389 | struct btrfs_file_extent_item); |
179e29e4 CM |
1390 | extent_type = btrfs_file_extent_type(leaf, fi); |
1391 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1392 | item_end += |
db94535d | 1393 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
1394 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1395 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
1396 | path->slots[0]); | |
1397 | item_end += btrfs_file_extent_inline_len(leaf, | |
1398 | item); | |
39279cc3 | 1399 | } |
008630c1 | 1400 | item_end--; |
39279cc3 CM |
1401 | } |
1402 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
1403 | ret = btrfs_csum_truncate(trans, root, path, | |
e02119d5 | 1404 | new_size); |
39279cc3 CM |
1405 | BUG_ON(ret); |
1406 | } | |
e02119d5 | 1407 | if (item_end < new_size) { |
b888db2b CM |
1408 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
1409 | found_type = BTRFS_INODE_ITEM_KEY; | |
1410 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
1411 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
1412 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
1413 | found_type = BTRFS_XATTR_ITEM_KEY; | |
1414 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
1415 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
1416 | } else if (found_type) { |
1417 | found_type--; | |
1418 | } else { | |
1419 | break; | |
39279cc3 | 1420 | } |
a61721d5 | 1421 | btrfs_set_key_type(&key, found_type); |
85e21bac | 1422 | goto next; |
39279cc3 | 1423 | } |
e02119d5 | 1424 | if (found_key.offset >= new_size) |
39279cc3 CM |
1425 | del_item = 1; |
1426 | else | |
1427 | del_item = 0; | |
1428 | found_extent = 0; | |
1429 | ||
1430 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
1431 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
1432 | goto delete; | |
1433 | ||
1434 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 1435 | u64 num_dec; |
db94535d | 1436 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 1437 | if (!del_item) { |
db94535d CM |
1438 | u64 orig_num_bytes = |
1439 | btrfs_file_extent_num_bytes(leaf, fi); | |
e02119d5 | 1440 | extent_num_bytes = new_size - |
5f39d397 | 1441 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
1442 | extent_num_bytes = extent_num_bytes & |
1443 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
1444 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1445 | extent_num_bytes); | |
1446 | num_dec = (orig_num_bytes - | |
9069218d | 1447 | extent_num_bytes); |
e02119d5 | 1448 | if (root->ref_cows && extent_start != 0) |
9069218d | 1449 | dec_i_blocks(inode, num_dec); |
5f39d397 | 1450 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 1451 | } else { |
db94535d CM |
1452 | extent_num_bytes = |
1453 | btrfs_file_extent_disk_num_bytes(leaf, | |
1454 | fi); | |
39279cc3 | 1455 | /* FIXME blocksize != 4096 */ |
9069218d | 1456 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
1457 | if (extent_start != 0) { |
1458 | found_extent = 1; | |
e02119d5 CM |
1459 | if (root->ref_cows) |
1460 | dec_i_blocks(inode, num_dec); | |
1461 | } | |
31840ae1 | 1462 | root_gen = btrfs_header_generation(leaf); |
d8d5f3e1 | 1463 | root_owner = btrfs_header_owner(leaf); |
39279cc3 | 1464 | } |
9069218d CM |
1465 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1466 | if (!del_item) { | |
e02119d5 CM |
1467 | u32 size = new_size - found_key.offset; |
1468 | ||
1469 | if (root->ref_cows) { | |
1470 | dec_i_blocks(inode, item_end + 1 - | |
1471 | found_key.offset - size); | |
1472 | } | |
1473 | size = | |
1474 | btrfs_file_extent_calc_inline_size(size); | |
9069218d | 1475 | ret = btrfs_truncate_item(trans, root, path, |
e02119d5 | 1476 | size, 1); |
9069218d | 1477 | BUG_ON(ret); |
e02119d5 | 1478 | } else if (root->ref_cows) { |
9069218d CM |
1479 | dec_i_blocks(inode, item_end + 1 - |
1480 | found_key.offset); | |
1481 | } | |
39279cc3 | 1482 | } |
179e29e4 | 1483 | delete: |
39279cc3 | 1484 | if (del_item) { |
85e21bac CM |
1485 | if (!pending_del_nr) { |
1486 | /* no pending yet, add ourselves */ | |
1487 | pending_del_slot = path->slots[0]; | |
1488 | pending_del_nr = 1; | |
1489 | } else if (pending_del_nr && | |
1490 | path->slots[0] + 1 == pending_del_slot) { | |
1491 | /* hop on the pending chunk */ | |
1492 | pending_del_nr++; | |
1493 | pending_del_slot = path->slots[0]; | |
1494 | } else { | |
1495 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
1496 | } | |
39279cc3 CM |
1497 | } else { |
1498 | break; | |
1499 | } | |
39279cc3 CM |
1500 | if (found_extent) { |
1501 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 1502 | extent_num_bytes, |
31840ae1 | 1503 | leaf->start, root_owner, |
7bb86316 CM |
1504 | root_gen, inode->i_ino, |
1505 | found_key.offset, 0); | |
39279cc3 CM |
1506 | BUG_ON(ret); |
1507 | } | |
85e21bac CM |
1508 | next: |
1509 | if (path->slots[0] == 0) { | |
1510 | if (pending_del_nr) | |
1511 | goto del_pending; | |
1512 | btrfs_release_path(root, path); | |
1513 | goto search_again; | |
1514 | } | |
1515 | ||
1516 | path->slots[0]--; | |
1517 | if (pending_del_nr && | |
1518 | path->slots[0] + 1 != pending_del_slot) { | |
1519 | struct btrfs_key debug; | |
1520 | del_pending: | |
1521 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
1522 | pending_del_slot); | |
1523 | ret = btrfs_del_items(trans, root, path, | |
1524 | pending_del_slot, | |
1525 | pending_del_nr); | |
1526 | BUG_ON(ret); | |
1527 | pending_del_nr = 0; | |
1528 | btrfs_release_path(root, path); | |
1529 | goto search_again; | |
1530 | } | |
39279cc3 CM |
1531 | } |
1532 | ret = 0; | |
1533 | error: | |
85e21bac CM |
1534 | if (pending_del_nr) { |
1535 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
1536 | pending_del_nr); | |
1537 | } | |
39279cc3 CM |
1538 | btrfs_free_path(path); |
1539 | inode->i_sb->s_dirt = 1; | |
1540 | return ret; | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * taken from block_truncate_page, but does cow as it zeros out | |
1545 | * any bytes left in the last page in the file. | |
1546 | */ | |
1547 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
1548 | { | |
1549 | struct inode *inode = mapping->host; | |
db94535d | 1550 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
1551 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
1552 | struct btrfs_ordered_extent *ordered; | |
1553 | char *kaddr; | |
db94535d | 1554 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
1555 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
1556 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
1557 | struct page *page; | |
39279cc3 | 1558 | int ret = 0; |
a52d9a80 | 1559 | u64 page_start; |
e6dcd2dc | 1560 | u64 page_end; |
39279cc3 CM |
1561 | |
1562 | if ((offset & (blocksize - 1)) == 0) | |
1563 | goto out; | |
1564 | ||
1565 | ret = -ENOMEM; | |
211c17f5 | 1566 | again: |
39279cc3 CM |
1567 | page = grab_cache_page(mapping, index); |
1568 | if (!page) | |
1569 | goto out; | |
e6dcd2dc CM |
1570 | |
1571 | page_start = page_offset(page); | |
1572 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1573 | ||
39279cc3 | 1574 | if (!PageUptodate(page)) { |
9ebefb18 | 1575 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 1576 | lock_page(page); |
211c17f5 CM |
1577 | if (page->mapping != mapping) { |
1578 | unlock_page(page); | |
1579 | page_cache_release(page); | |
1580 | goto again; | |
1581 | } | |
39279cc3 CM |
1582 | if (!PageUptodate(page)) { |
1583 | ret = -EIO; | |
89642229 | 1584 | goto out_unlock; |
39279cc3 CM |
1585 | } |
1586 | } | |
211c17f5 | 1587 | wait_on_page_writeback(page); |
e6dcd2dc CM |
1588 | |
1589 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
1590 | set_page_extent_mapped(page); | |
1591 | ||
1592 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
1593 | if (ordered) { | |
1594 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
1595 | unlock_page(page); | |
1596 | page_cache_release(page); | |
eb84ae03 | 1597 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
1598 | btrfs_put_ordered_extent(ordered); |
1599 | goto again; | |
1600 | } | |
1601 | ||
ea8c2819 | 1602 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
e6dcd2dc CM |
1603 | ret = 0; |
1604 | if (offset != PAGE_CACHE_SIZE) { | |
1605 | kaddr = kmap(page); | |
1606 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1607 | flush_dcache_page(page); | |
1608 | kunmap(page); | |
1609 | } | |
247e743c | 1610 | ClearPageChecked(page); |
e6dcd2dc CM |
1611 | set_page_dirty(page); |
1612 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
39279cc3 | 1613 | |
89642229 | 1614 | out_unlock: |
39279cc3 CM |
1615 | unlock_page(page); |
1616 | page_cache_release(page); | |
1617 | out: | |
1618 | return ret; | |
1619 | } | |
1620 | ||
1621 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1622 | { | |
1623 | struct inode *inode = dentry->d_inode; | |
1624 | int err; | |
1625 | ||
1626 | err = inode_change_ok(inode, attr); | |
1627 | if (err) | |
1628 | return err; | |
1629 | ||
1630 | if (S_ISREG(inode->i_mode) && | |
1631 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1632 | struct btrfs_trans_handle *trans; | |
1633 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1634 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1635 | |
5f39d397 | 1636 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1637 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1638 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1639 | u64 hole_size; |
179e29e4 | 1640 | u64 alloc_hint = 0; |
39279cc3 | 1641 | |
1b0f7c29 | 1642 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1643 | goto out; |
1644 | ||
1832a6d5 | 1645 | err = btrfs_check_free_space(root, 1, 0); |
1832a6d5 CM |
1646 | if (err) |
1647 | goto fail; | |
1648 | ||
39279cc3 CM |
1649 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1650 | ||
5f56406a | 1651 | hole_size = block_end - hole_start; |
7c2fe32a CM |
1652 | while(1) { |
1653 | struct btrfs_ordered_extent *ordered; | |
1654 | btrfs_wait_ordered_range(inode, hole_start, hole_size); | |
1655 | ||
1656 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); | |
1657 | ordered = btrfs_lookup_ordered_extent(inode, hole_start); | |
1658 | if (ordered) { | |
1659 | unlock_extent(io_tree, hole_start, | |
1660 | block_end - 1, GFP_NOFS); | |
1661 | btrfs_put_ordered_extent(ordered); | |
1662 | } else { | |
1663 | break; | |
1664 | } | |
1665 | } | |
39279cc3 | 1666 | |
39279cc3 CM |
1667 | trans = btrfs_start_transaction(root, 1); |
1668 | btrfs_set_trans_block_group(trans, inode); | |
ee6e6504 | 1669 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
2bf5a725 | 1670 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1671 | hole_start, block_end, hole_start, |
3326d1b0 | 1672 | &alloc_hint); |
2bf5a725 | 1673 | |
179e29e4 CM |
1674 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1675 | err = btrfs_insert_file_extent(trans, root, | |
1676 | inode->i_ino, | |
5f56406a | 1677 | hole_start, 0, 0, |
f2eb0a24 | 1678 | hole_size, 0); |
d1310b2e | 1679 | btrfs_drop_extent_cache(inode, hole_start, |
3b951516 | 1680 | (u64)-1); |
5f56406a | 1681 | btrfs_check_file(root, inode); |
179e29e4 | 1682 | } |
ee6e6504 | 1683 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
39279cc3 | 1684 | btrfs_end_transaction(trans, root); |
1b0f7c29 | 1685 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1686 | if (err) |
1687 | return err; | |
39279cc3 CM |
1688 | } |
1689 | out: | |
1690 | err = inode_setattr(inode, attr); | |
33268eaf JB |
1691 | |
1692 | if (!err && ((attr->ia_valid & ATTR_MODE))) | |
1693 | err = btrfs_acl_chmod(inode); | |
1832a6d5 | 1694 | fail: |
39279cc3 CM |
1695 | return err; |
1696 | } | |
61295eb8 | 1697 | |
39279cc3 CM |
1698 | void btrfs_delete_inode(struct inode *inode) |
1699 | { | |
1700 | struct btrfs_trans_handle *trans; | |
1701 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1702 | unsigned long nr; |
39279cc3 CM |
1703 | int ret; |
1704 | ||
1705 | truncate_inode_pages(&inode->i_data, 0); | |
1706 | if (is_bad_inode(inode)) { | |
7b128766 | 1707 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
1708 | goto no_delete; |
1709 | } | |
4a096752 | 1710 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
5f39d397 | 1711 | |
dbe674a9 | 1712 | btrfs_i_size_write(inode, 0); |
39279cc3 | 1713 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1714 | |
39279cc3 | 1715 | btrfs_set_trans_block_group(trans, inode); |
e02119d5 | 1716 | ret = btrfs_truncate_inode_items(trans, root, inode, inode->i_size, 0); |
7b128766 JB |
1717 | if (ret) { |
1718 | btrfs_orphan_del(NULL, inode); | |
54aa1f4d | 1719 | goto no_delete_lock; |
7b128766 JB |
1720 | } |
1721 | ||
1722 | btrfs_orphan_del(trans, inode); | |
85e21bac | 1723 | |
d3c2fdcf | 1724 | nr = trans->blocks_used; |
85e21bac | 1725 | clear_inode(inode); |
5f39d397 | 1726 | |
39279cc3 | 1727 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1728 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 1729 | return; |
54aa1f4d CM |
1730 | |
1731 | no_delete_lock: | |
d3c2fdcf | 1732 | nr = trans->blocks_used; |
54aa1f4d | 1733 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1734 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1735 | no_delete: |
1736 | clear_inode(inode); | |
1737 | } | |
1738 | ||
1739 | /* | |
1740 | * this returns the key found in the dir entry in the location pointer. | |
1741 | * If no dir entries were found, location->objectid is 0. | |
1742 | */ | |
1743 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1744 | struct btrfs_key *location) | |
1745 | { | |
1746 | const char *name = dentry->d_name.name; | |
1747 | int namelen = dentry->d_name.len; | |
1748 | struct btrfs_dir_item *di; | |
1749 | struct btrfs_path *path; | |
1750 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1751 | int ret = 0; |
39279cc3 CM |
1752 | |
1753 | path = btrfs_alloc_path(); | |
1754 | BUG_ON(!path); | |
3954401f | 1755 | |
39279cc3 CM |
1756 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1757 | namelen, 0); | |
0d9f7f3e Y |
1758 | if (IS_ERR(di)) |
1759 | ret = PTR_ERR(di); | |
39279cc3 | 1760 | if (!di || IS_ERR(di)) { |
3954401f | 1761 | goto out_err; |
39279cc3 | 1762 | } |
5f39d397 | 1763 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1764 | out: |
39279cc3 CM |
1765 | btrfs_free_path(path); |
1766 | return ret; | |
3954401f CM |
1767 | out_err: |
1768 | location->objectid = 0; | |
1769 | goto out; | |
39279cc3 CM |
1770 | } |
1771 | ||
1772 | /* | |
1773 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1774 | * needs to be changed to reflect the root directory of the tree root. This | |
1775 | * is kind of like crossing a mount point. | |
1776 | */ | |
1777 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1778 | struct btrfs_key *location, | |
58176a96 JB |
1779 | struct btrfs_root **sub_root, |
1780 | struct dentry *dentry) | |
39279cc3 | 1781 | { |
39279cc3 CM |
1782 | struct btrfs_root_item *ri; |
1783 | ||
1784 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1785 | return 0; | |
1786 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1787 | return 0; | |
1788 | ||
58176a96 JB |
1789 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1790 | dentry->d_name.name, | |
1791 | dentry->d_name.len); | |
39279cc3 CM |
1792 | if (IS_ERR(*sub_root)) |
1793 | return PTR_ERR(*sub_root); | |
1794 | ||
1795 | ri = &(*sub_root)->root_item; | |
1796 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1797 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1798 | location->offset = 0; | |
1799 | ||
39279cc3 CM |
1800 | return 0; |
1801 | } | |
1802 | ||
e02119d5 | 1803 | static noinline void init_btrfs_i(struct inode *inode) |
39279cc3 | 1804 | { |
e02119d5 CM |
1805 | struct btrfs_inode *bi = BTRFS_I(inode); |
1806 | ||
1807 | bi->i_acl = NULL; | |
1808 | bi->i_default_acl = NULL; | |
1809 | ||
1810 | bi->generation = 0; | |
1811 | bi->last_trans = 0; | |
1812 | bi->logged_trans = 0; | |
1813 | bi->delalloc_bytes = 0; | |
1814 | bi->disk_i_size = 0; | |
1815 | bi->flags = 0; | |
1816 | bi->index_cnt = (u64)-1; | |
49eb7e46 | 1817 | bi->log_dirty_trans = 0; |
d1310b2e CM |
1818 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1819 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1820 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1821 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1822 | inode->i_mapping, GFP_NOFS); | |
ea8c2819 | 1823 | INIT_LIST_HEAD(&BTRFS_I(inode)->delalloc_inodes); |
ba1da2f4 | 1824 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
1b1e2135 | 1825 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 1826 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
e02119d5 CM |
1827 | mutex_init(&BTRFS_I(inode)->log_mutex); |
1828 | } | |
1829 | ||
1830 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1831 | { | |
1832 | struct btrfs_iget_args *args = p; | |
1833 | inode->i_ino = args->ino; | |
1834 | init_btrfs_i(inode); | |
1835 | BTRFS_I(inode)->root = args->root; | |
39279cc3 CM |
1836 | return 0; |
1837 | } | |
1838 | ||
1839 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1840 | { | |
1841 | struct btrfs_iget_args *args = opaque; | |
1842 | return (args->ino == inode->i_ino && | |
1843 | args->root == BTRFS_I(inode)->root); | |
1844 | } | |
1845 | ||
1846 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, | |
1847 | struct btrfs_root *root) | |
1848 | { | |
1849 | struct inode *inode; | |
1850 | struct btrfs_iget_args args; | |
1851 | args.ino = objectid; | |
1852 | args.root = root; | |
1853 | ||
1854 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1855 | btrfs_init_locked_inode, | |
1856 | (void *)&args); | |
1857 | return inode; | |
1858 | } | |
1859 | ||
1a54ef8c BR |
1860 | /* Get an inode object given its location and corresponding root. |
1861 | * Returns in *is_new if the inode was read from disk | |
1862 | */ | |
1863 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, | |
1864 | struct btrfs_root *root, int *is_new) | |
1865 | { | |
1866 | struct inode *inode; | |
1867 | ||
1868 | inode = btrfs_iget_locked(s, location->objectid, root); | |
1869 | if (!inode) | |
1870 | return ERR_PTR(-EACCES); | |
1871 | ||
1872 | if (inode->i_state & I_NEW) { | |
1873 | BTRFS_I(inode)->root = root; | |
1874 | memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); | |
1875 | btrfs_read_locked_inode(inode); | |
1876 | unlock_new_inode(inode); | |
1877 | if (is_new) | |
1878 | *is_new = 1; | |
1879 | } else { | |
1880 | if (is_new) | |
1881 | *is_new = 0; | |
1882 | } | |
1883 | ||
1884 | return inode; | |
1885 | } | |
1886 | ||
39279cc3 CM |
1887 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
1888 | struct nameidata *nd) | |
1889 | { | |
1890 | struct inode * inode; | |
1891 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1892 | struct btrfs_root *root = bi->root; | |
1893 | struct btrfs_root *sub_root = root; | |
1894 | struct btrfs_key location; | |
1a54ef8c | 1895 | int ret, new, do_orphan = 0; |
39279cc3 CM |
1896 | |
1897 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1898 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1899 | |
39279cc3 | 1900 | ret = btrfs_inode_by_name(dir, dentry, &location); |
5f39d397 | 1901 | |
39279cc3 CM |
1902 | if (ret < 0) |
1903 | return ERR_PTR(ret); | |
5f39d397 | 1904 | |
39279cc3 CM |
1905 | inode = NULL; |
1906 | if (location.objectid) { | |
58176a96 JB |
1907 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1908 | dentry); | |
39279cc3 CM |
1909 | if (ret < 0) |
1910 | return ERR_PTR(ret); | |
1911 | if (ret > 0) | |
1912 | return ERR_PTR(-ENOENT); | |
1a54ef8c BR |
1913 | inode = btrfs_iget(dir->i_sb, &location, sub_root, &new); |
1914 | if (IS_ERR(inode)) | |
1915 | return ERR_CAST(inode); | |
1916 | ||
1917 | /* the inode and parent dir are two different roots */ | |
1918 | if (new && root != sub_root) { | |
1919 | igrab(inode); | |
1920 | sub_root->inode = inode; | |
1921 | do_orphan = 1; | |
39279cc3 CM |
1922 | } |
1923 | } | |
7b128766 JB |
1924 | |
1925 | if (unlikely(do_orphan)) | |
1926 | btrfs_orphan_cleanup(sub_root); | |
1927 | ||
39279cc3 CM |
1928 | return d_splice_alias(inode, dentry); |
1929 | } | |
1930 | ||
39279cc3 CM |
1931 | static unsigned char btrfs_filetype_table[] = { |
1932 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1933 | }; | |
1934 | ||
cbdf5a24 DW |
1935 | static int btrfs_real_readdir(struct file *filp, void *dirent, |
1936 | filldir_t filldir) | |
39279cc3 | 1937 | { |
6da6abae | 1938 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1939 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1940 | struct btrfs_item *item; | |
1941 | struct btrfs_dir_item *di; | |
1942 | struct btrfs_key key; | |
5f39d397 | 1943 | struct btrfs_key found_key; |
39279cc3 CM |
1944 | struct btrfs_path *path; |
1945 | int ret; | |
1946 | u32 nritems; | |
5f39d397 | 1947 | struct extent_buffer *leaf; |
39279cc3 CM |
1948 | int slot; |
1949 | int advance; | |
1950 | unsigned char d_type; | |
1951 | int over = 0; | |
1952 | u32 di_cur; | |
1953 | u32 di_total; | |
1954 | u32 di_len; | |
1955 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1956 | char tmp_name[32]; |
1957 | char *name_ptr; | |
1958 | int name_len; | |
39279cc3 CM |
1959 | |
1960 | /* FIXME, use a real flag for deciding about the key type */ | |
1961 | if (root->fs_info->tree_root == root) | |
1962 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1963 | |
3954401f CM |
1964 | /* special case for "." */ |
1965 | if (filp->f_pos == 0) { | |
1966 | over = filldir(dirent, ".", 1, | |
1967 | 1, inode->i_ino, | |
1968 | DT_DIR); | |
1969 | if (over) | |
1970 | return 0; | |
1971 | filp->f_pos = 1; | |
1972 | } | |
3954401f CM |
1973 | /* special case for .., just use the back ref */ |
1974 | if (filp->f_pos == 1) { | |
5ecc7e5d | 1975 | u64 pino = parent_ino(filp->f_path.dentry); |
3954401f | 1976 | over = filldir(dirent, "..", 2, |
5ecc7e5d | 1977 | 2, pino, DT_DIR); |
3954401f | 1978 | if (over) |
49593bfa | 1979 | return 0; |
3954401f CM |
1980 | filp->f_pos = 2; |
1981 | } | |
1982 | ||
49593bfa DW |
1983 | path = btrfs_alloc_path(); |
1984 | path->reada = 2; | |
1985 | ||
39279cc3 CM |
1986 | btrfs_set_key_type(&key, key_type); |
1987 | key.offset = filp->f_pos; | |
49593bfa | 1988 | key.objectid = inode->i_ino; |
5f39d397 | 1989 | |
39279cc3 CM |
1990 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1991 | if (ret < 0) | |
1992 | goto err; | |
1993 | advance = 0; | |
49593bfa DW |
1994 | |
1995 | while (1) { | |
5f39d397 CM |
1996 | leaf = path->nodes[0]; |
1997 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1998 | slot = path->slots[0]; |
1999 | if (advance || slot >= nritems) { | |
49593bfa | 2000 | if (slot >= nritems - 1) { |
39279cc3 CM |
2001 | ret = btrfs_next_leaf(root, path); |
2002 | if (ret) | |
2003 | break; | |
5f39d397 CM |
2004 | leaf = path->nodes[0]; |
2005 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
2006 | slot = path->slots[0]; |
2007 | } else { | |
2008 | slot++; | |
2009 | path->slots[0]++; | |
2010 | } | |
2011 | } | |
2012 | advance = 1; | |
5f39d397 CM |
2013 | item = btrfs_item_nr(leaf, slot); |
2014 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2015 | ||
2016 | if (found_key.objectid != key.objectid) | |
39279cc3 | 2017 | break; |
5f39d397 | 2018 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 2019 | break; |
5f39d397 | 2020 | if (found_key.offset < filp->f_pos) |
39279cc3 | 2021 | continue; |
5f39d397 CM |
2022 | |
2023 | filp->f_pos = found_key.offset; | |
49593bfa | 2024 | |
39279cc3 CM |
2025 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); |
2026 | di_cur = 0; | |
5f39d397 | 2027 | di_total = btrfs_item_size(leaf, item); |
49593bfa DW |
2028 | |
2029 | while (di_cur < di_total) { | |
5f39d397 CM |
2030 | struct btrfs_key location; |
2031 | ||
2032 | name_len = btrfs_dir_name_len(leaf, di); | |
49593bfa | 2033 | if (name_len <= sizeof(tmp_name)) { |
5f39d397 CM |
2034 | name_ptr = tmp_name; |
2035 | } else { | |
2036 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
49593bfa DW |
2037 | if (!name_ptr) { |
2038 | ret = -ENOMEM; | |
2039 | goto err; | |
2040 | } | |
5f39d397 CM |
2041 | } |
2042 | read_extent_buffer(leaf, name_ptr, | |
2043 | (unsigned long)(di + 1), name_len); | |
2044 | ||
2045 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
2046 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 | 2047 | over = filldir(dirent, name_ptr, name_len, |
49593bfa | 2048 | found_key.offset, location.objectid, |
39279cc3 | 2049 | d_type); |
5f39d397 CM |
2050 | |
2051 | if (name_ptr != tmp_name) | |
2052 | kfree(name_ptr); | |
2053 | ||
39279cc3 CM |
2054 | if (over) |
2055 | goto nopos; | |
49593bfa | 2056 | |
5103e947 | 2057 | di_len = btrfs_dir_name_len(leaf, di) + |
49593bfa | 2058 | btrfs_dir_data_len(leaf, di) + sizeof(*di); |
39279cc3 CM |
2059 | di_cur += di_len; |
2060 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
2061 | } | |
2062 | } | |
49593bfa DW |
2063 | |
2064 | /* Reached end of directory/root. Bump pos past the last item. */ | |
5e591a07 YZ |
2065 | if (key_type == BTRFS_DIR_INDEX_KEY) |
2066 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
2067 | else | |
2068 | filp->f_pos++; | |
39279cc3 CM |
2069 | nopos: |
2070 | ret = 0; | |
2071 | err: | |
39279cc3 | 2072 | btrfs_free_path(path); |
39279cc3 CM |
2073 | return ret; |
2074 | } | |
2075 | ||
2076 | int btrfs_write_inode(struct inode *inode, int wait) | |
2077 | { | |
2078 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2079 | struct btrfs_trans_handle *trans; | |
2080 | int ret = 0; | |
2081 | ||
4ca8b41e CM |
2082 | if (root->fs_info->closing > 1) |
2083 | return 0; | |
2084 | ||
39279cc3 | 2085 | if (wait) { |
f9295749 | 2086 | trans = btrfs_join_transaction(root, 1); |
39279cc3 CM |
2087 | btrfs_set_trans_block_group(trans, inode); |
2088 | ret = btrfs_commit_transaction(trans, root); | |
39279cc3 CM |
2089 | } |
2090 | return ret; | |
2091 | } | |
2092 | ||
2093 | /* | |
54aa1f4d | 2094 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
2095 | * inode changes. But, it is most likely to find the inode in cache. |
2096 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
2097 | * to keep or drop this code. | |
2098 | */ | |
2099 | void btrfs_dirty_inode(struct inode *inode) | |
2100 | { | |
2101 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2102 | struct btrfs_trans_handle *trans; | |
2103 | ||
f9295749 | 2104 | trans = btrfs_join_transaction(root, 1); |
39279cc3 CM |
2105 | btrfs_set_trans_block_group(trans, inode); |
2106 | btrfs_update_inode(trans, root, inode); | |
2107 | btrfs_end_transaction(trans, root); | |
39279cc3 CM |
2108 | } |
2109 | ||
aec7477b JB |
2110 | static int btrfs_set_inode_index_count(struct inode *inode) |
2111 | { | |
2112 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2113 | struct btrfs_key key, found_key; | |
2114 | struct btrfs_path *path; | |
2115 | struct extent_buffer *leaf; | |
2116 | int ret; | |
2117 | ||
2118 | key.objectid = inode->i_ino; | |
2119 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); | |
2120 | key.offset = (u64)-1; | |
2121 | ||
2122 | path = btrfs_alloc_path(); | |
2123 | if (!path) | |
2124 | return -ENOMEM; | |
2125 | ||
2126 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2127 | if (ret < 0) | |
2128 | goto out; | |
2129 | /* FIXME: we should be able to handle this */ | |
2130 | if (ret == 0) | |
2131 | goto out; | |
2132 | ret = 0; | |
2133 | ||
2134 | /* | |
2135 | * MAGIC NUMBER EXPLANATION: | |
2136 | * since we search a directory based on f_pos we have to start at 2 | |
2137 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
2138 | * else has to start at 2 | |
2139 | */ | |
2140 | if (path->slots[0] == 0) { | |
2141 | BTRFS_I(inode)->index_cnt = 2; | |
2142 | goto out; | |
2143 | } | |
2144 | ||
2145 | path->slots[0]--; | |
2146 | ||
2147 | leaf = path->nodes[0]; | |
2148 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2149 | ||
2150 | if (found_key.objectid != inode->i_ino || | |
2151 | btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) { | |
2152 | BTRFS_I(inode)->index_cnt = 2; | |
2153 | goto out; | |
2154 | } | |
2155 | ||
2156 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
2157 | out: | |
2158 | btrfs_free_path(path); | |
2159 | return ret; | |
2160 | } | |
2161 | ||
00e4e6b3 CM |
2162 | static int btrfs_set_inode_index(struct inode *dir, struct inode *inode, |
2163 | u64 *index) | |
aec7477b JB |
2164 | { |
2165 | int ret = 0; | |
2166 | ||
2167 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
2168 | ret = btrfs_set_inode_index_count(dir); | |
8d5bf1cb | 2169 | if (ret) { |
aec7477b | 2170 | return ret; |
8d5bf1cb | 2171 | } |
aec7477b JB |
2172 | } |
2173 | ||
00e4e6b3 | 2174 | *index = BTRFS_I(dir)->index_cnt; |
aec7477b JB |
2175 | BTRFS_I(dir)->index_cnt++; |
2176 | ||
2177 | return ret; | |
2178 | } | |
2179 | ||
39279cc3 CM |
2180 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2181 | struct btrfs_root *root, | |
aec7477b | 2182 | struct inode *dir, |
9c58309d CM |
2183 | const char *name, int name_len, |
2184 | u64 ref_objectid, | |
39279cc3 CM |
2185 | u64 objectid, |
2186 | struct btrfs_block_group_cache *group, | |
00e4e6b3 | 2187 | int mode, u64 *index) |
39279cc3 CM |
2188 | { |
2189 | struct inode *inode; | |
5f39d397 | 2190 | struct btrfs_inode_item *inode_item; |
6324fbf3 | 2191 | struct btrfs_block_group_cache *new_inode_group; |
39279cc3 | 2192 | struct btrfs_key *location; |
5f39d397 | 2193 | struct btrfs_path *path; |
9c58309d CM |
2194 | struct btrfs_inode_ref *ref; |
2195 | struct btrfs_key key[2]; | |
2196 | u32 sizes[2]; | |
2197 | unsigned long ptr; | |
39279cc3 CM |
2198 | int ret; |
2199 | int owner; | |
2200 | ||
5f39d397 CM |
2201 | path = btrfs_alloc_path(); |
2202 | BUG_ON(!path); | |
2203 | ||
39279cc3 CM |
2204 | inode = new_inode(root->fs_info->sb); |
2205 | if (!inode) | |
2206 | return ERR_PTR(-ENOMEM); | |
2207 | ||
aec7477b | 2208 | if (dir) { |
00e4e6b3 | 2209 | ret = btrfs_set_inode_index(dir, inode, index); |
aec7477b JB |
2210 | if (ret) |
2211 | return ERR_PTR(ret); | |
aec7477b JB |
2212 | } |
2213 | /* | |
2214 | * index_cnt is ignored for everything but a dir, | |
2215 | * btrfs_get_inode_index_count has an explanation for the magic | |
2216 | * number | |
2217 | */ | |
e02119d5 | 2218 | init_btrfs_i(inode); |
aec7477b | 2219 | BTRFS_I(inode)->index_cnt = 2; |
39279cc3 | 2220 | BTRFS_I(inode)->root = root; |
e02119d5 | 2221 | BTRFS_I(inode)->generation = trans->transid; |
b888db2b | 2222 | |
39279cc3 CM |
2223 | if (mode & S_IFDIR) |
2224 | owner = 0; | |
2225 | else | |
2226 | owner = 1; | |
6324fbf3 | 2227 | new_inode_group = btrfs_find_block_group(root, group, 0, |
0b86a832 | 2228 | BTRFS_BLOCK_GROUP_METADATA, owner); |
6324fbf3 CM |
2229 | if (!new_inode_group) { |
2230 | printk("find_block group failed\n"); | |
2231 | new_inode_group = group; | |
2232 | } | |
2233 | BTRFS_I(inode)->block_group = new_inode_group; | |
9c58309d CM |
2234 | |
2235 | key[0].objectid = objectid; | |
2236 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
2237 | key[0].offset = 0; | |
2238 | ||
2239 | key[1].objectid = objectid; | |
2240 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
2241 | key[1].offset = ref_objectid; | |
2242 | ||
2243 | sizes[0] = sizeof(struct btrfs_inode_item); | |
2244 | sizes[1] = name_len + sizeof(*ref); | |
2245 | ||
2246 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
2247 | if (ret != 0) | |
5f39d397 CM |
2248 | goto fail; |
2249 | ||
9c58309d CM |
2250 | if (objectid > root->highest_inode) |
2251 | root->highest_inode = objectid; | |
2252 | ||
39279cc3 CM |
2253 | inode->i_uid = current->fsuid; |
2254 | inode->i_gid = current->fsgid; | |
2255 | inode->i_mode = mode; | |
2256 | inode->i_ino = objectid; | |
2257 | inode->i_blocks = 0; | |
2258 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
2259 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2260 | struct btrfs_inode_item); | |
e02119d5 | 2261 | fill_inode_item(trans, path->nodes[0], inode_item, inode); |
9c58309d CM |
2262 | |
2263 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
2264 | struct btrfs_inode_ref); | |
2265 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
00e4e6b3 | 2266 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); |
9c58309d CM |
2267 | ptr = (unsigned long)(ref + 1); |
2268 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
2269 | ||
5f39d397 CM |
2270 | btrfs_mark_buffer_dirty(path->nodes[0]); |
2271 | btrfs_free_path(path); | |
2272 | ||
39279cc3 CM |
2273 | location = &BTRFS_I(inode)->location; |
2274 | location->objectid = objectid; | |
39279cc3 CM |
2275 | location->offset = 0; |
2276 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
2277 | ||
39279cc3 CM |
2278 | insert_inode_hash(inode); |
2279 | return inode; | |
5f39d397 | 2280 | fail: |
aec7477b JB |
2281 | if (dir) |
2282 | BTRFS_I(dir)->index_cnt--; | |
5f39d397 CM |
2283 | btrfs_free_path(path); |
2284 | return ERR_PTR(ret); | |
39279cc3 CM |
2285 | } |
2286 | ||
2287 | static inline u8 btrfs_inode_type(struct inode *inode) | |
2288 | { | |
2289 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
2290 | } | |
2291 | ||
e02119d5 CM |
2292 | int btrfs_add_link(struct btrfs_trans_handle *trans, |
2293 | struct inode *parent_inode, struct inode *inode, | |
2294 | const char *name, int name_len, int add_backref, u64 index) | |
39279cc3 CM |
2295 | { |
2296 | int ret; | |
2297 | struct btrfs_key key; | |
e02119d5 | 2298 | struct btrfs_root *root = BTRFS_I(parent_inode)->root; |
5f39d397 | 2299 | |
39279cc3 | 2300 | key.objectid = inode->i_ino; |
39279cc3 CM |
2301 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
2302 | key.offset = 0; | |
2303 | ||
e02119d5 CM |
2304 | ret = btrfs_insert_dir_item(trans, root, name, name_len, |
2305 | parent_inode->i_ino, | |
aec7477b | 2306 | &key, btrfs_inode_type(inode), |
00e4e6b3 | 2307 | index); |
39279cc3 | 2308 | if (ret == 0) { |
9c58309d CM |
2309 | if (add_backref) { |
2310 | ret = btrfs_insert_inode_ref(trans, root, | |
e02119d5 CM |
2311 | name, name_len, |
2312 | inode->i_ino, | |
2313 | parent_inode->i_ino, | |
2314 | index); | |
9c58309d | 2315 | } |
dbe674a9 | 2316 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
e02119d5 | 2317 | name_len * 2); |
79c44584 | 2318 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
e02119d5 | 2319 | ret = btrfs_update_inode(trans, root, parent_inode); |
39279cc3 CM |
2320 | } |
2321 | return ret; | |
2322 | } | |
2323 | ||
2324 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d | 2325 | struct dentry *dentry, struct inode *inode, |
00e4e6b3 | 2326 | int backref, u64 index) |
39279cc3 | 2327 | { |
e02119d5 CM |
2328 | int err = btrfs_add_link(trans, dentry->d_parent->d_inode, |
2329 | inode, dentry->d_name.name, | |
2330 | dentry->d_name.len, backref, index); | |
39279cc3 CM |
2331 | if (!err) { |
2332 | d_instantiate(dentry, inode); | |
2333 | return 0; | |
2334 | } | |
2335 | if (err > 0) | |
2336 | err = -EEXIST; | |
2337 | return err; | |
2338 | } | |
2339 | ||
618e21d5 JB |
2340 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
2341 | int mode, dev_t rdev) | |
2342 | { | |
2343 | struct btrfs_trans_handle *trans; | |
2344 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 2345 | struct inode *inode = NULL; |
618e21d5 JB |
2346 | int err; |
2347 | int drop_inode = 0; | |
2348 | u64 objectid; | |
1832a6d5 | 2349 | unsigned long nr = 0; |
00e4e6b3 | 2350 | u64 index = 0; |
618e21d5 JB |
2351 | |
2352 | if (!new_valid_dev(rdev)) | |
2353 | return -EINVAL; | |
2354 | ||
1832a6d5 CM |
2355 | err = btrfs_check_free_space(root, 1, 0); |
2356 | if (err) | |
2357 | goto fail; | |
2358 | ||
618e21d5 JB |
2359 | trans = btrfs_start_transaction(root, 1); |
2360 | btrfs_set_trans_block_group(trans, dir); | |
2361 | ||
2362 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2363 | if (err) { | |
2364 | err = -ENOSPC; | |
2365 | goto out_unlock; | |
2366 | } | |
2367 | ||
aec7477b | 2368 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
2369 | dentry->d_name.len, |
2370 | dentry->d_parent->d_inode->i_ino, objectid, | |
00e4e6b3 | 2371 | BTRFS_I(dir)->block_group, mode, &index); |
618e21d5 JB |
2372 | err = PTR_ERR(inode); |
2373 | if (IS_ERR(inode)) | |
2374 | goto out_unlock; | |
2375 | ||
33268eaf JB |
2376 | err = btrfs_init_acl(inode, dir); |
2377 | if (err) { | |
2378 | drop_inode = 1; | |
2379 | goto out_unlock; | |
2380 | } | |
2381 | ||
618e21d5 | 2382 | btrfs_set_trans_block_group(trans, inode); |
00e4e6b3 | 2383 | err = btrfs_add_nondir(trans, dentry, inode, 0, index); |
618e21d5 JB |
2384 | if (err) |
2385 | drop_inode = 1; | |
2386 | else { | |
2387 | inode->i_op = &btrfs_special_inode_operations; | |
2388 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 2389 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
2390 | } |
2391 | dir->i_sb->s_dirt = 1; | |
2392 | btrfs_update_inode_block_group(trans, inode); | |
2393 | btrfs_update_inode_block_group(trans, dir); | |
2394 | out_unlock: | |
d3c2fdcf | 2395 | nr = trans->blocks_used; |
89ce8a63 | 2396 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2397 | fail: |
618e21d5 JB |
2398 | if (drop_inode) { |
2399 | inode_dec_link_count(inode); | |
2400 | iput(inode); | |
2401 | } | |
d3c2fdcf | 2402 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
2403 | return err; |
2404 | } | |
2405 | ||
39279cc3 CM |
2406 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
2407 | int mode, struct nameidata *nd) | |
2408 | { | |
2409 | struct btrfs_trans_handle *trans; | |
2410 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 2411 | struct inode *inode = NULL; |
39279cc3 CM |
2412 | int err; |
2413 | int drop_inode = 0; | |
1832a6d5 | 2414 | unsigned long nr = 0; |
39279cc3 | 2415 | u64 objectid; |
00e4e6b3 | 2416 | u64 index = 0; |
39279cc3 | 2417 | |
1832a6d5 CM |
2418 | err = btrfs_check_free_space(root, 1, 0); |
2419 | if (err) | |
2420 | goto fail; | |
39279cc3 CM |
2421 | trans = btrfs_start_transaction(root, 1); |
2422 | btrfs_set_trans_block_group(trans, dir); | |
2423 | ||
2424 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2425 | if (err) { | |
2426 | err = -ENOSPC; | |
2427 | goto out_unlock; | |
2428 | } | |
2429 | ||
aec7477b | 2430 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
2431 | dentry->d_name.len, |
2432 | dentry->d_parent->d_inode->i_ino, | |
00e4e6b3 CM |
2433 | objectid, BTRFS_I(dir)->block_group, mode, |
2434 | &index); | |
39279cc3 CM |
2435 | err = PTR_ERR(inode); |
2436 | if (IS_ERR(inode)) | |
2437 | goto out_unlock; | |
2438 | ||
33268eaf JB |
2439 | err = btrfs_init_acl(inode, dir); |
2440 | if (err) { | |
2441 | drop_inode = 1; | |
2442 | goto out_unlock; | |
2443 | } | |
2444 | ||
39279cc3 | 2445 | btrfs_set_trans_block_group(trans, inode); |
00e4e6b3 | 2446 | err = btrfs_add_nondir(trans, dentry, inode, 0, index); |
39279cc3 CM |
2447 | if (err) |
2448 | drop_inode = 1; | |
2449 | else { | |
2450 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 2451 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
2452 | inode->i_fop = &btrfs_file_operations; |
2453 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e | 2454 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
2455 | } |
2456 | dir->i_sb->s_dirt = 1; | |
2457 | btrfs_update_inode_block_group(trans, inode); | |
2458 | btrfs_update_inode_block_group(trans, dir); | |
2459 | out_unlock: | |
d3c2fdcf | 2460 | nr = trans->blocks_used; |
ab78c84d | 2461 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2462 | fail: |
39279cc3 CM |
2463 | if (drop_inode) { |
2464 | inode_dec_link_count(inode); | |
2465 | iput(inode); | |
2466 | } | |
d3c2fdcf | 2467 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2468 | return err; |
2469 | } | |
2470 | ||
2471 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
2472 | struct dentry *dentry) | |
2473 | { | |
2474 | struct btrfs_trans_handle *trans; | |
2475 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2476 | struct inode *inode = old_dentry->d_inode; | |
00e4e6b3 | 2477 | u64 index; |
1832a6d5 | 2478 | unsigned long nr = 0; |
39279cc3 CM |
2479 | int err; |
2480 | int drop_inode = 0; | |
2481 | ||
2482 | if (inode->i_nlink == 0) | |
2483 | return -ENOENT; | |
2484 | ||
e02119d5 | 2485 | btrfs_inc_nlink(inode); |
1832a6d5 CM |
2486 | err = btrfs_check_free_space(root, 1, 0); |
2487 | if (err) | |
2488 | goto fail; | |
00e4e6b3 | 2489 | err = btrfs_set_inode_index(dir, inode, &index); |
aec7477b JB |
2490 | if (err) |
2491 | goto fail; | |
2492 | ||
39279cc3 | 2493 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2494 | |
39279cc3 CM |
2495 | btrfs_set_trans_block_group(trans, dir); |
2496 | atomic_inc(&inode->i_count); | |
aec7477b | 2497 | |
00e4e6b3 | 2498 | err = btrfs_add_nondir(trans, dentry, inode, 1, index); |
5f39d397 | 2499 | |
39279cc3 CM |
2500 | if (err) |
2501 | drop_inode = 1; | |
5f39d397 | 2502 | |
39279cc3 CM |
2503 | dir->i_sb->s_dirt = 1; |
2504 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 2505 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 2506 | |
54aa1f4d CM |
2507 | if (err) |
2508 | drop_inode = 1; | |
39279cc3 | 2509 | |
d3c2fdcf | 2510 | nr = trans->blocks_used; |
ab78c84d | 2511 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2512 | fail: |
39279cc3 CM |
2513 | if (drop_inode) { |
2514 | inode_dec_link_count(inode); | |
2515 | iput(inode); | |
2516 | } | |
d3c2fdcf | 2517 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2518 | return err; |
2519 | } | |
2520 | ||
39279cc3 CM |
2521 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2522 | { | |
b9d86667 | 2523 | struct inode *inode = NULL; |
39279cc3 CM |
2524 | struct btrfs_trans_handle *trans; |
2525 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2526 | int err = 0; | |
2527 | int drop_on_err = 0; | |
b9d86667 | 2528 | u64 objectid = 0; |
00e4e6b3 | 2529 | u64 index = 0; |
d3c2fdcf | 2530 | unsigned long nr = 1; |
39279cc3 | 2531 | |
1832a6d5 CM |
2532 | err = btrfs_check_free_space(root, 1, 0); |
2533 | if (err) | |
2534 | goto out_unlock; | |
2535 | ||
39279cc3 CM |
2536 | trans = btrfs_start_transaction(root, 1); |
2537 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 2538 | |
39279cc3 CM |
2539 | if (IS_ERR(trans)) { |
2540 | err = PTR_ERR(trans); | |
2541 | goto out_unlock; | |
2542 | } | |
2543 | ||
2544 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2545 | if (err) { | |
2546 | err = -ENOSPC; | |
2547 | goto out_unlock; | |
2548 | } | |
2549 | ||
aec7477b | 2550 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
2551 | dentry->d_name.len, |
2552 | dentry->d_parent->d_inode->i_ino, objectid, | |
00e4e6b3 CM |
2553 | BTRFS_I(dir)->block_group, S_IFDIR | mode, |
2554 | &index); | |
39279cc3 CM |
2555 | if (IS_ERR(inode)) { |
2556 | err = PTR_ERR(inode); | |
2557 | goto out_fail; | |
2558 | } | |
5f39d397 | 2559 | |
39279cc3 | 2560 | drop_on_err = 1; |
33268eaf JB |
2561 | |
2562 | err = btrfs_init_acl(inode, dir); | |
2563 | if (err) | |
2564 | goto out_fail; | |
2565 | ||
39279cc3 CM |
2566 | inode->i_op = &btrfs_dir_inode_operations; |
2567 | inode->i_fop = &btrfs_dir_file_operations; | |
2568 | btrfs_set_trans_block_group(trans, inode); | |
2569 | ||
dbe674a9 | 2570 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
2571 | err = btrfs_update_inode(trans, root, inode); |
2572 | if (err) | |
2573 | goto out_fail; | |
5f39d397 | 2574 | |
e02119d5 CM |
2575 | err = btrfs_add_link(trans, dentry->d_parent->d_inode, |
2576 | inode, dentry->d_name.name, | |
2577 | dentry->d_name.len, 0, index); | |
39279cc3 CM |
2578 | if (err) |
2579 | goto out_fail; | |
5f39d397 | 2580 | |
39279cc3 CM |
2581 | d_instantiate(dentry, inode); |
2582 | drop_on_err = 0; | |
2583 | dir->i_sb->s_dirt = 1; | |
2584 | btrfs_update_inode_block_group(trans, inode); | |
2585 | btrfs_update_inode_block_group(trans, dir); | |
2586 | ||
2587 | out_fail: | |
d3c2fdcf | 2588 | nr = trans->blocks_used; |
ab78c84d | 2589 | btrfs_end_transaction_throttle(trans, root); |
5f39d397 | 2590 | |
39279cc3 | 2591 | out_unlock: |
39279cc3 CM |
2592 | if (drop_on_err) |
2593 | iput(inode); | |
d3c2fdcf | 2594 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2595 | return err; |
2596 | } | |
2597 | ||
3b951516 CM |
2598 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
2599 | struct extent_map *existing, | |
e6dcd2dc CM |
2600 | struct extent_map *em, |
2601 | u64 map_start, u64 map_len) | |
3b951516 CM |
2602 | { |
2603 | u64 start_diff; | |
3b951516 | 2604 | |
e6dcd2dc CM |
2605 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
2606 | start_diff = map_start - em->start; | |
2607 | em->start = map_start; | |
2608 | em->len = map_len; | |
2609 | if (em->block_start < EXTENT_MAP_LAST_BYTE) | |
2610 | em->block_start += start_diff; | |
2611 | return add_extent_mapping(em_tree, em); | |
3b951516 CM |
2612 | } |
2613 | ||
a52d9a80 | 2614 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 2615 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
2616 | int create) |
2617 | { | |
2618 | int ret; | |
2619 | int err = 0; | |
db94535d | 2620 | u64 bytenr; |
a52d9a80 CM |
2621 | u64 extent_start = 0; |
2622 | u64 extent_end = 0; | |
2623 | u64 objectid = inode->i_ino; | |
2624 | u32 found_type; | |
f421950f | 2625 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
2626 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2627 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
2628 | struct extent_buffer *leaf; |
2629 | struct btrfs_key found_key; | |
a52d9a80 CM |
2630 | struct extent_map *em = NULL; |
2631 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 2632 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
2633 | struct btrfs_trans_handle *trans = NULL; |
2634 | ||
a52d9a80 | 2635 | again: |
d1310b2e CM |
2636 | spin_lock(&em_tree->lock); |
2637 | em = lookup_extent_mapping(em_tree, start, len); | |
a061fc8d CM |
2638 | if (em) |
2639 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
d1310b2e CM |
2640 | spin_unlock(&em_tree->lock); |
2641 | ||
a52d9a80 | 2642 | if (em) { |
e1c4b745 CM |
2643 | if (em->start > start || em->start + em->len <= start) |
2644 | free_extent_map(em); | |
2645 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
2646 | free_extent_map(em); |
2647 | else | |
2648 | goto out; | |
a52d9a80 | 2649 | } |
d1310b2e | 2650 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 2651 | if (!em) { |
d1310b2e CM |
2652 | err = -ENOMEM; |
2653 | goto out; | |
a52d9a80 | 2654 | } |
e6dcd2dc | 2655 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e CM |
2656 | em->start = EXTENT_MAP_HOLE; |
2657 | em->len = (u64)-1; | |
f421950f CM |
2658 | |
2659 | if (!path) { | |
2660 | path = btrfs_alloc_path(); | |
2661 | BUG_ON(!path); | |
2662 | } | |
2663 | ||
179e29e4 CM |
2664 | ret = btrfs_lookup_file_extent(trans, root, path, |
2665 | objectid, start, trans != NULL); | |
a52d9a80 CM |
2666 | if (ret < 0) { |
2667 | err = ret; | |
2668 | goto out; | |
2669 | } | |
2670 | ||
2671 | if (ret != 0) { | |
2672 | if (path->slots[0] == 0) | |
2673 | goto not_found; | |
2674 | path->slots[0]--; | |
2675 | } | |
2676 | ||
5f39d397 CM |
2677 | leaf = path->nodes[0]; |
2678 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 2679 | struct btrfs_file_extent_item); |
a52d9a80 | 2680 | /* are we inside the extent that was found? */ |
5f39d397 CM |
2681 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2682 | found_type = btrfs_key_type(&found_key); | |
2683 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
2684 | found_type != BTRFS_EXTENT_DATA_KEY) { |
2685 | goto not_found; | |
2686 | } | |
2687 | ||
5f39d397 CM |
2688 | found_type = btrfs_file_extent_type(leaf, item); |
2689 | extent_start = found_key.offset; | |
a52d9a80 CM |
2690 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
2691 | extent_end = extent_start + | |
db94535d | 2692 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 2693 | err = 0; |
b888db2b | 2694 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2695 | em->start = start; |
2696 | if (start < extent_start) { | |
d1310b2e | 2697 | if (start + len <= extent_start) |
b888db2b | 2698 | goto not_found; |
d1310b2e | 2699 | em->len = extent_end - extent_start; |
a52d9a80 | 2700 | } else { |
d1310b2e | 2701 | em->len = len; |
a52d9a80 CM |
2702 | } |
2703 | goto not_found_em; | |
2704 | } | |
db94535d CM |
2705 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2706 | if (bytenr == 0) { | |
a52d9a80 | 2707 | em->start = extent_start; |
d1310b2e | 2708 | em->len = extent_end - extent_start; |
5f39d397 | 2709 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2710 | goto insert; |
2711 | } | |
db94535d CM |
2712 | bytenr += btrfs_file_extent_offset(leaf, item); |
2713 | em->block_start = bytenr; | |
a52d9a80 | 2714 | em->start = extent_start; |
d1310b2e | 2715 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2716 | goto insert; |
2717 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2718 | u64 page_start; |
5f39d397 | 2719 | unsigned long ptr; |
a52d9a80 | 2720 | char *map; |
3326d1b0 CM |
2721 | size_t size; |
2722 | size_t extent_offset; | |
2723 | size_t copy_size; | |
a52d9a80 | 2724 | |
5f39d397 CM |
2725 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2726 | path->slots[0])); | |
d1310b2e CM |
2727 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2728 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2729 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2730 | em->start = start; |
2731 | if (start < extent_start) { | |
d1310b2e | 2732 | if (start + len <= extent_start) |
b888db2b | 2733 | goto not_found; |
d1310b2e | 2734 | em->len = extent_end - extent_start; |
a52d9a80 | 2735 | } else { |
d1310b2e | 2736 | em->len = len; |
a52d9a80 CM |
2737 | } |
2738 | goto not_found_em; | |
2739 | } | |
689f9346 | 2740 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2741 | |
2742 | if (!page) { | |
2743 | em->start = extent_start; | |
d1310b2e | 2744 | em->len = size; |
689f9346 Y |
2745 | goto out; |
2746 | } | |
5f39d397 | 2747 | |
70dec807 CM |
2748 | page_start = page_offset(page) + pg_offset; |
2749 | extent_offset = page_start - extent_start; | |
2750 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2751 | size - extent_offset); |
3326d1b0 | 2752 | em->start = extent_start + extent_offset; |
70dec807 CM |
2753 | em->len = (copy_size + root->sectorsize - 1) & |
2754 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2755 | map = kmap(page); |
2756 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2757 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2758 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2759 | copy_size); |
2760 | flush_dcache_page(page); | |
2761 | } else if (create && PageUptodate(page)) { | |
2762 | if (!trans) { | |
2763 | kunmap(page); | |
2764 | free_extent_map(em); | |
2765 | em = NULL; | |
2766 | btrfs_release_path(root, path); | |
f9295749 | 2767 | trans = btrfs_join_transaction(root, 1); |
179e29e4 CM |
2768 | goto again; |
2769 | } | |
70dec807 | 2770 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2771 | copy_size); |
2772 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2773 | } |
a52d9a80 | 2774 | kunmap(page); |
d1310b2e CM |
2775 | set_extent_uptodate(io_tree, em->start, |
2776 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2777 | goto insert; |
2778 | } else { | |
2779 | printk("unkknown found_type %d\n", found_type); | |
2780 | WARN_ON(1); | |
2781 | } | |
2782 | not_found: | |
2783 | em->start = start; | |
d1310b2e | 2784 | em->len = len; |
a52d9a80 | 2785 | not_found_em: |
5f39d397 | 2786 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2787 | insert: |
2788 | btrfs_release_path(root, path); | |
d1310b2e CM |
2789 | if (em->start > start || extent_map_end(em) <= start) { |
2790 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2791 | err = -EIO; |
2792 | goto out; | |
2793 | } | |
d1310b2e CM |
2794 | |
2795 | err = 0; | |
2796 | spin_lock(&em_tree->lock); | |
a52d9a80 | 2797 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
2798 | /* it is possible that someone inserted the extent into the tree |
2799 | * while we had the lock dropped. It is also possible that | |
2800 | * an overlapping map exists in the tree | |
2801 | */ | |
a52d9a80 | 2802 | if (ret == -EEXIST) { |
3b951516 | 2803 | struct extent_map *existing; |
e6dcd2dc CM |
2804 | |
2805 | ret = 0; | |
2806 | ||
3b951516 | 2807 | existing = lookup_extent_mapping(em_tree, start, len); |
e1c4b745 CM |
2808 | if (existing && (existing->start > start || |
2809 | existing->start + existing->len <= start)) { | |
2810 | free_extent_map(existing); | |
2811 | existing = NULL; | |
2812 | } | |
3b951516 CM |
2813 | if (!existing) { |
2814 | existing = lookup_extent_mapping(em_tree, em->start, | |
2815 | em->len); | |
2816 | if (existing) { | |
2817 | err = merge_extent_mapping(em_tree, existing, | |
e6dcd2dc CM |
2818 | em, start, |
2819 | root->sectorsize); | |
3b951516 CM |
2820 | free_extent_map(existing); |
2821 | if (err) { | |
2822 | free_extent_map(em); | |
2823 | em = NULL; | |
2824 | } | |
2825 | } else { | |
2826 | err = -EIO; | |
2827 | printk("failing to insert %Lu %Lu\n", | |
2828 | start, len); | |
2829 | free_extent_map(em); | |
2830 | em = NULL; | |
2831 | } | |
2832 | } else { | |
2833 | free_extent_map(em); | |
2834 | em = existing; | |
e6dcd2dc | 2835 | err = 0; |
a52d9a80 | 2836 | } |
a52d9a80 | 2837 | } |
d1310b2e | 2838 | spin_unlock(&em_tree->lock); |
a52d9a80 | 2839 | out: |
f421950f CM |
2840 | if (path) |
2841 | btrfs_free_path(path); | |
a52d9a80 CM |
2842 | if (trans) { |
2843 | ret = btrfs_end_transaction(trans, root); | |
e6dcd2dc | 2844 | if (!err) { |
a52d9a80 | 2845 | err = ret; |
e6dcd2dc | 2846 | } |
a52d9a80 | 2847 | } |
a52d9a80 CM |
2848 | if (err) { |
2849 | free_extent_map(em); | |
2850 | WARN_ON(1); | |
2851 | return ERR_PTR(err); | |
2852 | } | |
2853 | return em; | |
2854 | } | |
2855 | ||
e1c4b745 | 2856 | #if 0 /* waiting for O_DIRECT reads */ |
16432985 CM |
2857 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
2858 | struct buffer_head *bh_result, int create) | |
2859 | { | |
2860 | struct extent_map *em; | |
2861 | u64 start = (u64)iblock << inode->i_blkbits; | |
2862 | struct btrfs_multi_bio *multi = NULL; | |
2863 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2864 | u64 len; | |
2865 | u64 logical; | |
2866 | u64 map_length; | |
2867 | int ret = 0; | |
2868 | ||
2869 | em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0); | |
2870 | ||
2871 | if (!em || IS_ERR(em)) | |
2872 | goto out; | |
2873 | ||
e1c4b745 | 2874 | if (em->start > start || em->start + em->len <= start) { |
16432985 | 2875 | goto out; |
e1c4b745 | 2876 | } |
16432985 CM |
2877 | |
2878 | if (em->block_start == EXTENT_MAP_INLINE) { | |
2879 | ret = -EINVAL; | |
2880 | goto out; | |
2881 | } | |
2882 | ||
e1c4b745 CM |
2883 | len = em->start + em->len - start; |
2884 | len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size))); | |
2885 | ||
16432985 CM |
2886 | if (em->block_start == EXTENT_MAP_HOLE || |
2887 | em->block_start == EXTENT_MAP_DELALLOC) { | |
e1c4b745 | 2888 | bh_result->b_size = len; |
16432985 CM |
2889 | goto out; |
2890 | } | |
2891 | ||
16432985 CM |
2892 | logical = start - em->start; |
2893 | logical = em->block_start + logical; | |
2894 | ||
2895 | map_length = len; | |
2896 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
2897 | logical, &map_length, &multi, 0); | |
2898 | BUG_ON(ret); | |
2899 | bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits; | |
2900 | bh_result->b_size = min(map_length, len); | |
e1c4b745 | 2901 | |
16432985 CM |
2902 | bh_result->b_bdev = multi->stripes[0].dev->bdev; |
2903 | set_buffer_mapped(bh_result); | |
2904 | kfree(multi); | |
2905 | out: | |
2906 | free_extent_map(em); | |
2907 | return ret; | |
2908 | } | |
e1c4b745 | 2909 | #endif |
16432985 CM |
2910 | |
2911 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, | |
2912 | const struct iovec *iov, loff_t offset, | |
2913 | unsigned long nr_segs) | |
2914 | { | |
e1c4b745 CM |
2915 | return -EINVAL; |
2916 | #if 0 | |
16432985 CM |
2917 | struct file *file = iocb->ki_filp; |
2918 | struct inode *inode = file->f_mapping->host; | |
2919 | ||
2920 | if (rw == WRITE) | |
2921 | return -EINVAL; | |
2922 | ||
2923 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
2924 | offset, nr_segs, btrfs_get_block, NULL); | |
e1c4b745 | 2925 | #endif |
16432985 CM |
2926 | } |
2927 | ||
d396c6f5 | 2928 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2929 | { |
d396c6f5 | 2930 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2931 | } |
2932 | ||
a52d9a80 | 2933 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2934 | { |
d1310b2e CM |
2935 | struct extent_io_tree *tree; |
2936 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2937 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2938 | } |
1832a6d5 | 2939 | |
a52d9a80 | 2940 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2941 | { |
d1310b2e | 2942 | struct extent_io_tree *tree; |
b888db2b CM |
2943 | |
2944 | ||
2945 | if (current->flags & PF_MEMALLOC) { | |
2946 | redirty_page_for_writepage(wbc, page); | |
2947 | unlock_page(page); | |
2948 | return 0; | |
2949 | } | |
d1310b2e | 2950 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2951 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2952 | } |
2953 | ||
f421950f CM |
2954 | int btrfs_writepages(struct address_space *mapping, |
2955 | struct writeback_control *wbc) | |
b293f02e | 2956 | { |
d1310b2e CM |
2957 | struct extent_io_tree *tree; |
2958 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2959 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2960 | } | |
2961 | ||
3ab2fb5a CM |
2962 | static int |
2963 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2964 | struct list_head *pages, unsigned nr_pages) | |
2965 | { | |
d1310b2e CM |
2966 | struct extent_io_tree *tree; |
2967 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2968 | return extent_readpages(tree, mapping, pages, nr_pages, |
2969 | btrfs_get_extent); | |
2970 | } | |
e6dcd2dc | 2971 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2972 | { |
d1310b2e CM |
2973 | struct extent_io_tree *tree; |
2974 | struct extent_map_tree *map; | |
a52d9a80 | 2975 | int ret; |
8c2383c3 | 2976 | |
d1310b2e CM |
2977 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2978 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2979 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
2980 | if (ret == 1) { |
2981 | ClearPagePrivate(page); | |
2982 | set_page_private(page, 0); | |
2983 | page_cache_release(page); | |
39279cc3 | 2984 | } |
a52d9a80 | 2985 | return ret; |
39279cc3 CM |
2986 | } |
2987 | ||
e6dcd2dc CM |
2988 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
2989 | { | |
98509cfc CM |
2990 | if (PageWriteback(page) || PageDirty(page)) |
2991 | return 0; | |
e6dcd2dc CM |
2992 | return __btrfs_releasepage(page, gfp_flags); |
2993 | } | |
2994 | ||
a52d9a80 | 2995 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 2996 | { |
d1310b2e | 2997 | struct extent_io_tree *tree; |
e6dcd2dc CM |
2998 | struct btrfs_ordered_extent *ordered; |
2999 | u64 page_start = page_offset(page); | |
3000 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
39279cc3 | 3001 | |
e6dcd2dc | 3002 | wait_on_page_writeback(page); |
d1310b2e | 3003 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
e6dcd2dc CM |
3004 | if (offset) { |
3005 | btrfs_releasepage(page, GFP_NOFS); | |
3006 | return; | |
3007 | } | |
3008 | ||
3009 | lock_extent(tree, page_start, page_end, GFP_NOFS); | |
3010 | ordered = btrfs_lookup_ordered_extent(page->mapping->host, | |
3011 | page_offset(page)); | |
3012 | if (ordered) { | |
eb84ae03 CM |
3013 | /* |
3014 | * IO on this page will never be started, so we need | |
3015 | * to account for any ordered extents now | |
3016 | */ | |
e6dcd2dc CM |
3017 | clear_extent_bit(tree, page_start, page_end, |
3018 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
3019 | EXTENT_LOCKED, 1, 0, GFP_NOFS); | |
211f90e6 CM |
3020 | btrfs_finish_ordered_io(page->mapping->host, |
3021 | page_start, page_end); | |
e6dcd2dc CM |
3022 | btrfs_put_ordered_extent(ordered); |
3023 | lock_extent(tree, page_start, page_end, GFP_NOFS); | |
3024 | } | |
3025 | clear_extent_bit(tree, page_start, page_end, | |
3026 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | | |
3027 | EXTENT_ORDERED, | |
3028 | 1, 1, GFP_NOFS); | |
3029 | __btrfs_releasepage(page, GFP_NOFS); | |
3030 | ||
4a096752 | 3031 | ClearPageChecked(page); |
9ad6b7bc | 3032 | if (PagePrivate(page)) { |
9ad6b7bc CM |
3033 | ClearPagePrivate(page); |
3034 | set_page_private(page, 0); | |
3035 | page_cache_release(page); | |
3036 | } | |
39279cc3 CM |
3037 | } |
3038 | ||
9ebefb18 CM |
3039 | /* |
3040 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
3041 | * called from a page fault handler when a page is first dirtied. Hence we must | |
3042 | * be careful to check for EOF conditions here. We set the page up correctly | |
3043 | * for a written page which means we get ENOSPC checking when writing into | |
3044 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
3045 | * support these features. | |
3046 | * | |
3047 | * We are not allowed to take the i_mutex here so we have to play games to | |
3048 | * protect against truncate races as the page could now be beyond EOF. Because | |
3049 | * vmtruncate() writes the inode size before removing pages, once we have the | |
3050 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
3051 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
3052 | * unlock the page. | |
3053 | */ | |
3054 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
3055 | { | |
6da6abae | 3056 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 3057 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
3058 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
3059 | struct btrfs_ordered_extent *ordered; | |
3060 | char *kaddr; | |
3061 | unsigned long zero_start; | |
9ebefb18 | 3062 | loff_t size; |
1832a6d5 | 3063 | int ret; |
a52d9a80 | 3064 | u64 page_start; |
e6dcd2dc | 3065 | u64 page_end; |
9ebefb18 | 3066 | |
1832a6d5 | 3067 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); |
1832a6d5 CM |
3068 | if (ret) |
3069 | goto out; | |
3070 | ||
3071 | ret = -EINVAL; | |
e6dcd2dc | 3072 | again: |
9ebefb18 | 3073 | lock_page(page); |
9ebefb18 | 3074 | size = i_size_read(inode); |
e6dcd2dc CM |
3075 | page_start = page_offset(page); |
3076 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
a52d9a80 | 3077 | |
9ebefb18 | 3078 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 3079 | (page_start >= size)) { |
9ebefb18 CM |
3080 | /* page got truncated out from underneath us */ |
3081 | goto out_unlock; | |
3082 | } | |
e6dcd2dc CM |
3083 | wait_on_page_writeback(page); |
3084 | ||
3085 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3086 | set_page_extent_mapped(page); | |
3087 | ||
eb84ae03 CM |
3088 | /* |
3089 | * we can't set the delalloc bits if there are pending ordered | |
3090 | * extents. Drop our locks and wait for them to finish | |
3091 | */ | |
e6dcd2dc CM |
3092 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
3093 | if (ordered) { | |
3094 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3095 | unlock_page(page); | |
eb84ae03 | 3096 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
3097 | btrfs_put_ordered_extent(ordered); |
3098 | goto again; | |
3099 | } | |
3100 | ||
ea8c2819 | 3101 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
e6dcd2dc | 3102 | ret = 0; |
9ebefb18 CM |
3103 | |
3104 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 3105 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 3106 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 3107 | else |
e6dcd2dc | 3108 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 3109 | |
e6dcd2dc CM |
3110 | if (zero_start != PAGE_CACHE_SIZE) { |
3111 | kaddr = kmap(page); | |
3112 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
3113 | flush_dcache_page(page); | |
3114 | kunmap(page); | |
3115 | } | |
247e743c | 3116 | ClearPageChecked(page); |
e6dcd2dc CM |
3117 | set_page_dirty(page); |
3118 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
9ebefb18 CM |
3119 | |
3120 | out_unlock: | |
3121 | unlock_page(page); | |
1832a6d5 | 3122 | out: |
9ebefb18 CM |
3123 | return ret; |
3124 | } | |
3125 | ||
39279cc3 CM |
3126 | static void btrfs_truncate(struct inode *inode) |
3127 | { | |
3128 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3129 | int ret; | |
3130 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 3131 | unsigned long nr; |
dbe674a9 | 3132 | u64 mask = root->sectorsize - 1; |
39279cc3 CM |
3133 | |
3134 | if (!S_ISREG(inode->i_mode)) | |
3135 | return; | |
3136 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
3137 | return; | |
3138 | ||
3139 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
4a096752 | 3140 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
39279cc3 | 3141 | |
39279cc3 CM |
3142 | trans = btrfs_start_transaction(root, 1); |
3143 | btrfs_set_trans_block_group(trans, inode); | |
dbe674a9 | 3144 | btrfs_i_size_write(inode, inode->i_size); |
39279cc3 | 3145 | |
7b128766 JB |
3146 | ret = btrfs_orphan_add(trans, inode); |
3147 | if (ret) | |
3148 | goto out; | |
39279cc3 | 3149 | /* FIXME, add redo link to tree so we don't leak on crash */ |
e02119d5 | 3150 | ret = btrfs_truncate_inode_items(trans, root, inode, inode->i_size, |
85e21bac | 3151 | BTRFS_EXTENT_DATA_KEY); |
39279cc3 | 3152 | btrfs_update_inode(trans, root, inode); |
5f39d397 | 3153 | |
7b128766 JB |
3154 | ret = btrfs_orphan_del(trans, inode); |
3155 | BUG_ON(ret); | |
3156 | ||
3157 | out: | |
3158 | nr = trans->blocks_used; | |
89ce8a63 | 3159 | ret = btrfs_end_transaction_throttle(trans, root); |
39279cc3 | 3160 | BUG_ON(ret); |
d3c2fdcf | 3161 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
3162 | } |
3163 | ||
3b96362c SW |
3164 | /* |
3165 | * Invalidate a single dcache entry at the root of the filesystem. | |
3166 | * Needed after creation of snapshot or subvolume. | |
3167 | */ | |
3168 | void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name, | |
3169 | int namelen) | |
3170 | { | |
3171 | struct dentry *alias, *entry; | |
3172 | struct qstr qstr; | |
3173 | ||
3174 | alias = d_find_alias(root->fs_info->sb->s_root->d_inode); | |
3175 | if (alias) { | |
3176 | qstr.name = name; | |
3177 | qstr.len = namelen; | |
3178 | /* change me if btrfs ever gets a d_hash operation */ | |
3179 | qstr.hash = full_name_hash(qstr.name, qstr.len); | |
3180 | entry = d_lookup(alias, &qstr); | |
3181 | dput(alias); | |
3182 | if (entry) { | |
3183 | d_invalidate(entry); | |
3184 | dput(entry); | |
3185 | } | |
3186 | } | |
3187 | } | |
3188 | ||
f46b5a66 CH |
3189 | int btrfs_create_subvol_root(struct btrfs_root *new_root, |
3190 | struct btrfs_trans_handle *trans, u64 new_dirid, | |
3191 | struct btrfs_block_group_cache *block_group) | |
39279cc3 | 3192 | { |
39279cc3 | 3193 | struct inode *inode; |
00e4e6b3 | 3194 | u64 index = 0; |
39279cc3 | 3195 | |
aec7477b | 3196 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, new_dirid, |
00e4e6b3 | 3197 | new_dirid, block_group, S_IFDIR | 0700, &index); |
54aa1f4d | 3198 | if (IS_ERR(inode)) |
f46b5a66 | 3199 | return PTR_ERR(inode); |
39279cc3 CM |
3200 | inode->i_op = &btrfs_dir_inode_operations; |
3201 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 3202 | new_root->inode = inode; |
39279cc3 | 3203 | |
39279cc3 | 3204 | inode->i_nlink = 1; |
dbe674a9 | 3205 | btrfs_i_size_write(inode, 0); |
3b96362c | 3206 | |
f46b5a66 | 3207 | return btrfs_update_inode(trans, new_root, inode); |
39279cc3 CM |
3208 | } |
3209 | ||
edbd8d4e | 3210 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
3211 | struct file_ra_state *ra, struct file *file, |
3212 | pgoff_t offset, pgoff_t last_index) | |
3213 | { | |
8e7bf94f | 3214 | pgoff_t req_size = last_index - offset + 1; |
86479a04 | 3215 | |
86479a04 CM |
3216 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); |
3217 | return offset + req_size; | |
86479a04 CM |
3218 | } |
3219 | ||
39279cc3 CM |
3220 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
3221 | { | |
3222 | struct btrfs_inode *ei; | |
3223 | ||
3224 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
3225 | if (!ei) | |
3226 | return NULL; | |
15ee9bc7 | 3227 | ei->last_trans = 0; |
e02119d5 | 3228 | ei->logged_trans = 0; |
e6dcd2dc | 3229 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
33268eaf JB |
3230 | ei->i_acl = BTRFS_ACL_NOT_CACHED; |
3231 | ei->i_default_acl = BTRFS_ACL_NOT_CACHED; | |
7b128766 | 3232 | INIT_LIST_HEAD(&ei->i_orphan); |
39279cc3 CM |
3233 | return &ei->vfs_inode; |
3234 | } | |
3235 | ||
3236 | void btrfs_destroy_inode(struct inode *inode) | |
3237 | { | |
e6dcd2dc | 3238 | struct btrfs_ordered_extent *ordered; |
39279cc3 CM |
3239 | WARN_ON(!list_empty(&inode->i_dentry)); |
3240 | WARN_ON(inode->i_data.nrpages); | |
3241 | ||
33268eaf JB |
3242 | if (BTRFS_I(inode)->i_acl && |
3243 | BTRFS_I(inode)->i_acl != BTRFS_ACL_NOT_CACHED) | |
3244 | posix_acl_release(BTRFS_I(inode)->i_acl); | |
3245 | if (BTRFS_I(inode)->i_default_acl && | |
3246 | BTRFS_I(inode)->i_default_acl != BTRFS_ACL_NOT_CACHED) | |
3247 | posix_acl_release(BTRFS_I(inode)->i_default_acl); | |
3248 | ||
bcc63abb | 3249 | spin_lock(&BTRFS_I(inode)->root->list_lock); |
7b128766 JB |
3250 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { |
3251 | printk(KERN_ERR "BTRFS: inode %lu: inode still on the orphan" | |
3252 | " list\n", inode->i_ino); | |
3253 | dump_stack(); | |
3254 | } | |
bcc63abb | 3255 | spin_unlock(&BTRFS_I(inode)->root->list_lock); |
7b128766 | 3256 | |
e6dcd2dc CM |
3257 | while(1) { |
3258 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); | |
3259 | if (!ordered) | |
3260 | break; | |
3261 | else { | |
3262 | printk("found ordered extent %Lu %Lu\n", | |
3263 | ordered->file_offset, ordered->len); | |
3264 | btrfs_remove_ordered_extent(inode, ordered); | |
3265 | btrfs_put_ordered_extent(ordered); | |
3266 | btrfs_put_ordered_extent(ordered); | |
3267 | } | |
3268 | } | |
8c416c9e | 3269 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
3270 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
3271 | } | |
3272 | ||
0ee0fda0 | 3273 | static void init_once(void *foo) |
39279cc3 CM |
3274 | { |
3275 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
3276 | ||
3277 | inode_init_once(&ei->vfs_inode); | |
3278 | } | |
3279 | ||
3280 | void btrfs_destroy_cachep(void) | |
3281 | { | |
3282 | if (btrfs_inode_cachep) | |
3283 | kmem_cache_destroy(btrfs_inode_cachep); | |
3284 | if (btrfs_trans_handle_cachep) | |
3285 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
3286 | if (btrfs_transaction_cachep) | |
3287 | kmem_cache_destroy(btrfs_transaction_cachep); | |
3288 | if (btrfs_bit_radix_cachep) | |
3289 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
3290 | if (btrfs_path_cachep) | |
3291 | kmem_cache_destroy(btrfs_path_cachep); | |
3292 | } | |
3293 | ||
86479a04 | 3294 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 3295 | unsigned long extra_flags, |
2b1f55b0 | 3296 | void (*ctor)(void *)) |
92fee66d CM |
3297 | { |
3298 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
2b1f55b0 | 3299 | SLAB_MEM_SPREAD | extra_flags), ctor); |
92fee66d CM |
3300 | } |
3301 | ||
39279cc3 CM |
3302 | int btrfs_init_cachep(void) |
3303 | { | |
86479a04 | 3304 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
3305 | sizeof(struct btrfs_inode), |
3306 | 0, init_once); | |
39279cc3 CM |
3307 | if (!btrfs_inode_cachep) |
3308 | goto fail; | |
86479a04 CM |
3309 | btrfs_trans_handle_cachep = |
3310 | btrfs_cache_create("btrfs_trans_handle_cache", | |
3311 | sizeof(struct btrfs_trans_handle), | |
3312 | 0, NULL); | |
39279cc3 CM |
3313 | if (!btrfs_trans_handle_cachep) |
3314 | goto fail; | |
86479a04 | 3315 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 3316 | sizeof(struct btrfs_transaction), |
92fee66d | 3317 | 0, NULL); |
39279cc3 CM |
3318 | if (!btrfs_transaction_cachep) |
3319 | goto fail; | |
86479a04 | 3320 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 3321 | sizeof(struct btrfs_path), |
92fee66d | 3322 | 0, NULL); |
39279cc3 CM |
3323 | if (!btrfs_path_cachep) |
3324 | goto fail; | |
86479a04 | 3325 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 3326 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
3327 | if (!btrfs_bit_radix_cachep) |
3328 | goto fail; | |
3329 | return 0; | |
3330 | fail: | |
3331 | btrfs_destroy_cachep(); | |
3332 | return -ENOMEM; | |
3333 | } | |
3334 | ||
3335 | static int btrfs_getattr(struct vfsmount *mnt, | |
3336 | struct dentry *dentry, struct kstat *stat) | |
3337 | { | |
3338 | struct inode *inode = dentry->d_inode; | |
3339 | generic_fillattr(inode, stat); | |
d6667462 | 3340 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 3341 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
3342 | return 0; |
3343 | } | |
3344 | ||
3345 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
3346 | struct inode * new_dir,struct dentry *new_dentry) | |
3347 | { | |
3348 | struct btrfs_trans_handle *trans; | |
3349 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
3350 | struct inode *new_inode = new_dentry->d_inode; | |
3351 | struct inode *old_inode = old_dentry->d_inode; | |
3352 | struct timespec ctime = CURRENT_TIME; | |
00e4e6b3 | 3353 | u64 index = 0; |
39279cc3 CM |
3354 | int ret; |
3355 | ||
3356 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
3357 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
3358 | return -ENOTEMPTY; | |
3359 | } | |
5f39d397 | 3360 | |
1832a6d5 CM |
3361 | ret = btrfs_check_free_space(root, 1, 0); |
3362 | if (ret) | |
3363 | goto out_unlock; | |
3364 | ||
39279cc3 | 3365 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 3366 | |
39279cc3 | 3367 | btrfs_set_trans_block_group(trans, new_dir); |
39279cc3 | 3368 | |
e02119d5 | 3369 | btrfs_inc_nlink(old_dentry->d_inode); |
39279cc3 CM |
3370 | old_dir->i_ctime = old_dir->i_mtime = ctime; |
3371 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
3372 | old_inode->i_ctime = ctime; | |
5f39d397 | 3373 | |
e02119d5 CM |
3374 | ret = btrfs_unlink_inode(trans, root, old_dir, old_dentry->d_inode, |
3375 | old_dentry->d_name.name, | |
3376 | old_dentry->d_name.len); | |
39279cc3 CM |
3377 | if (ret) |
3378 | goto out_fail; | |
3379 | ||
3380 | if (new_inode) { | |
3381 | new_inode->i_ctime = CURRENT_TIME; | |
e02119d5 CM |
3382 | ret = btrfs_unlink_inode(trans, root, new_dir, |
3383 | new_dentry->d_inode, | |
3384 | new_dentry->d_name.name, | |
3385 | new_dentry->d_name.len); | |
39279cc3 CM |
3386 | if (ret) |
3387 | goto out_fail; | |
7b128766 | 3388 | if (new_inode->i_nlink == 0) { |
e02119d5 | 3389 | ret = btrfs_orphan_add(trans, new_dentry->d_inode); |
7b128766 JB |
3390 | if (ret) |
3391 | goto out_fail; | |
3392 | } | |
e02119d5 | 3393 | |
39279cc3 | 3394 | } |
00e4e6b3 | 3395 | ret = btrfs_set_inode_index(new_dir, old_inode, &index); |
aec7477b JB |
3396 | if (ret) |
3397 | goto out_fail; | |
3398 | ||
e02119d5 CM |
3399 | ret = btrfs_add_link(trans, new_dentry->d_parent->d_inode, |
3400 | old_inode, new_dentry->d_name.name, | |
3401 | new_dentry->d_name.len, 1, index); | |
39279cc3 CM |
3402 | if (ret) |
3403 | goto out_fail; | |
3404 | ||
3405 | out_fail: | |
ab78c84d | 3406 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 3407 | out_unlock: |
39279cc3 CM |
3408 | return ret; |
3409 | } | |
3410 | ||
ea8c2819 CM |
3411 | int btrfs_start_delalloc_inodes(struct btrfs_root *root) |
3412 | { | |
3413 | struct list_head *head = &root->fs_info->delalloc_inodes; | |
3414 | struct btrfs_inode *binode; | |
3415 | unsigned long flags; | |
3416 | ||
3417 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
3418 | while(!list_empty(head)) { | |
3419 | binode = list_entry(head->next, struct btrfs_inode, | |
3420 | delalloc_inodes); | |
3421 | atomic_inc(&binode->vfs_inode.i_count); | |
3422 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); | |
3423 | filemap_write_and_wait(binode->vfs_inode.i_mapping); | |
3424 | iput(&binode->vfs_inode); | |
3425 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
3426 | } | |
3427 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); | |
3428 | return 0; | |
3429 | } | |
3430 | ||
39279cc3 CM |
3431 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
3432 | const char *symname) | |
3433 | { | |
3434 | struct btrfs_trans_handle *trans; | |
3435 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
3436 | struct btrfs_path *path; | |
3437 | struct btrfs_key key; | |
1832a6d5 | 3438 | struct inode *inode = NULL; |
39279cc3 CM |
3439 | int err; |
3440 | int drop_inode = 0; | |
3441 | u64 objectid; | |
00e4e6b3 | 3442 | u64 index = 0 ; |
39279cc3 CM |
3443 | int name_len; |
3444 | int datasize; | |
5f39d397 | 3445 | unsigned long ptr; |
39279cc3 | 3446 | struct btrfs_file_extent_item *ei; |
5f39d397 | 3447 | struct extent_buffer *leaf; |
1832a6d5 | 3448 | unsigned long nr = 0; |
39279cc3 CM |
3449 | |
3450 | name_len = strlen(symname) + 1; | |
3451 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
3452 | return -ENAMETOOLONG; | |
1832a6d5 | 3453 | |
1832a6d5 CM |
3454 | err = btrfs_check_free_space(root, 1, 0); |
3455 | if (err) | |
3456 | goto out_fail; | |
3457 | ||
39279cc3 CM |
3458 | trans = btrfs_start_transaction(root, 1); |
3459 | btrfs_set_trans_block_group(trans, dir); | |
3460 | ||
3461 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
3462 | if (err) { | |
3463 | err = -ENOSPC; | |
3464 | goto out_unlock; | |
3465 | } | |
3466 | ||
aec7477b | 3467 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
3468 | dentry->d_name.len, |
3469 | dentry->d_parent->d_inode->i_ino, objectid, | |
00e4e6b3 CM |
3470 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO, |
3471 | &index); | |
39279cc3 CM |
3472 | err = PTR_ERR(inode); |
3473 | if (IS_ERR(inode)) | |
3474 | goto out_unlock; | |
3475 | ||
33268eaf JB |
3476 | err = btrfs_init_acl(inode, dir); |
3477 | if (err) { | |
3478 | drop_inode = 1; | |
3479 | goto out_unlock; | |
3480 | } | |
3481 | ||
39279cc3 | 3482 | btrfs_set_trans_block_group(trans, inode); |
00e4e6b3 | 3483 | err = btrfs_add_nondir(trans, dentry, inode, 0, index); |
39279cc3 CM |
3484 | if (err) |
3485 | drop_inode = 1; | |
3486 | else { | |
3487 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 3488 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
3489 | inode->i_fop = &btrfs_file_operations; |
3490 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e | 3491 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
3492 | } |
3493 | dir->i_sb->s_dirt = 1; | |
3494 | btrfs_update_inode_block_group(trans, inode); | |
3495 | btrfs_update_inode_block_group(trans, dir); | |
3496 | if (drop_inode) | |
3497 | goto out_unlock; | |
3498 | ||
3499 | path = btrfs_alloc_path(); | |
3500 | BUG_ON(!path); | |
3501 | key.objectid = inode->i_ino; | |
3502 | key.offset = 0; | |
39279cc3 CM |
3503 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
3504 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
3505 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
3506 | datasize); | |
54aa1f4d CM |
3507 | if (err) { |
3508 | drop_inode = 1; | |
3509 | goto out_unlock; | |
3510 | } | |
5f39d397 CM |
3511 | leaf = path->nodes[0]; |
3512 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
3513 | struct btrfs_file_extent_item); | |
3514 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
3515 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
3516 | BTRFS_FILE_EXTENT_INLINE); |
3517 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
3518 | write_extent_buffer(leaf, symname, ptr, name_len); |
3519 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 3520 | btrfs_free_path(path); |
5f39d397 | 3521 | |
39279cc3 CM |
3522 | inode->i_op = &btrfs_symlink_inode_operations; |
3523 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 3524 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
dbe674a9 | 3525 | btrfs_i_size_write(inode, name_len - 1); |
54aa1f4d CM |
3526 | err = btrfs_update_inode(trans, root, inode); |
3527 | if (err) | |
3528 | drop_inode = 1; | |
39279cc3 CM |
3529 | |
3530 | out_unlock: | |
d3c2fdcf | 3531 | nr = trans->blocks_used; |
ab78c84d | 3532 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 3533 | out_fail: |
39279cc3 CM |
3534 | if (drop_inode) { |
3535 | inode_dec_link_count(inode); | |
3536 | iput(inode); | |
3537 | } | |
d3c2fdcf | 3538 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
3539 | return err; |
3540 | } | |
16432985 | 3541 | |
e6dcd2dc CM |
3542 | static int btrfs_set_page_dirty(struct page *page) |
3543 | { | |
e6dcd2dc CM |
3544 | return __set_page_dirty_nobuffers(page); |
3545 | } | |
3546 | ||
0ee0fda0 | 3547 | static int btrfs_permission(struct inode *inode, int mask) |
fdebe2bd Y |
3548 | { |
3549 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
3550 | return -EACCES; | |
33268eaf | 3551 | return generic_permission(inode, mask, btrfs_check_acl); |
fdebe2bd | 3552 | } |
39279cc3 CM |
3553 | |
3554 | static struct inode_operations btrfs_dir_inode_operations = { | |
3555 | .lookup = btrfs_lookup, | |
3556 | .create = btrfs_create, | |
3557 | .unlink = btrfs_unlink, | |
3558 | .link = btrfs_link, | |
3559 | .mkdir = btrfs_mkdir, | |
3560 | .rmdir = btrfs_rmdir, | |
3561 | .rename = btrfs_rename, | |
3562 | .symlink = btrfs_symlink, | |
3563 | .setattr = btrfs_setattr, | |
618e21d5 | 3564 | .mknod = btrfs_mknod, |
95819c05 CH |
3565 | .setxattr = btrfs_setxattr, |
3566 | .getxattr = btrfs_getxattr, | |
5103e947 | 3567 | .listxattr = btrfs_listxattr, |
95819c05 | 3568 | .removexattr = btrfs_removexattr, |
fdebe2bd | 3569 | .permission = btrfs_permission, |
39279cc3 | 3570 | }; |
39279cc3 CM |
3571 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3572 | .lookup = btrfs_lookup, | |
fdebe2bd | 3573 | .permission = btrfs_permission, |
39279cc3 | 3574 | }; |
39279cc3 CM |
3575 | static struct file_operations btrfs_dir_file_operations = { |
3576 | .llseek = generic_file_llseek, | |
3577 | .read = generic_read_dir, | |
cbdf5a24 | 3578 | .readdir = btrfs_real_readdir, |
34287aa3 | 3579 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 3580 | #ifdef CONFIG_COMPAT |
34287aa3 | 3581 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 3582 | #endif |
6bf13c0c | 3583 | .release = btrfs_release_file, |
e02119d5 | 3584 | .fsync = btrfs_sync_file, |
39279cc3 CM |
3585 | }; |
3586 | ||
d1310b2e | 3587 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 3588 | .fill_delalloc = run_delalloc_range, |
065631f6 | 3589 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 3590 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac | 3591 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
e6dcd2dc | 3592 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 3593 | .writepage_start_hook = btrfs_writepage_start_hook, |
1259ab75 | 3594 | .readpage_io_failed_hook = btrfs_io_failed_hook, |
b0c68f8b CM |
3595 | .set_bit_hook = btrfs_set_bit_hook, |
3596 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
3597 | }; |
3598 | ||
39279cc3 CM |
3599 | static struct address_space_operations btrfs_aops = { |
3600 | .readpage = btrfs_readpage, | |
3601 | .writepage = btrfs_writepage, | |
b293f02e | 3602 | .writepages = btrfs_writepages, |
3ab2fb5a | 3603 | .readpages = btrfs_readpages, |
39279cc3 | 3604 | .sync_page = block_sync_page, |
39279cc3 | 3605 | .bmap = btrfs_bmap, |
16432985 | 3606 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
3607 | .invalidatepage = btrfs_invalidatepage, |
3608 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 3609 | .set_page_dirty = btrfs_set_page_dirty, |
39279cc3 CM |
3610 | }; |
3611 | ||
3612 | static struct address_space_operations btrfs_symlink_aops = { | |
3613 | .readpage = btrfs_readpage, | |
3614 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3615 | .invalidatepage = btrfs_invalidatepage, |
3616 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3617 | }; |
3618 | ||
3619 | static struct inode_operations btrfs_file_inode_operations = { | |
3620 | .truncate = btrfs_truncate, | |
3621 | .getattr = btrfs_getattr, | |
3622 | .setattr = btrfs_setattr, | |
95819c05 CH |
3623 | .setxattr = btrfs_setxattr, |
3624 | .getxattr = btrfs_getxattr, | |
5103e947 | 3625 | .listxattr = btrfs_listxattr, |
95819c05 | 3626 | .removexattr = btrfs_removexattr, |
fdebe2bd | 3627 | .permission = btrfs_permission, |
39279cc3 | 3628 | }; |
618e21d5 JB |
3629 | static struct inode_operations btrfs_special_inode_operations = { |
3630 | .getattr = btrfs_getattr, | |
3631 | .setattr = btrfs_setattr, | |
fdebe2bd | 3632 | .permission = btrfs_permission, |
95819c05 CH |
3633 | .setxattr = btrfs_setxattr, |
3634 | .getxattr = btrfs_getxattr, | |
33268eaf | 3635 | .listxattr = btrfs_listxattr, |
95819c05 | 3636 | .removexattr = btrfs_removexattr, |
618e21d5 | 3637 | }; |
39279cc3 CM |
3638 | static struct inode_operations btrfs_symlink_inode_operations = { |
3639 | .readlink = generic_readlink, | |
3640 | .follow_link = page_follow_link_light, | |
3641 | .put_link = page_put_link, | |
fdebe2bd | 3642 | .permission = btrfs_permission, |
39279cc3 | 3643 | }; |