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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
8f18cf13 | 19 | #include <linux/kernel.h> |
065631f6 | 20 | #include <linux/bio.h> |
39279cc3 | 21 | #include <linux/buffer_head.h> |
f2eb0a24 | 22 | #include <linux/file.h> |
39279cc3 CM |
23 | #include <linux/fs.h> |
24 | #include <linux/pagemap.h> | |
25 | #include <linux/highmem.h> | |
26 | #include <linux/time.h> | |
27 | #include <linux/init.h> | |
28 | #include <linux/string.h> | |
29 | #include <linux/smp_lock.h> | |
30 | #include <linux/backing-dev.h> | |
31 | #include <linux/mpage.h> | |
32 | #include <linux/swap.h> | |
33 | #include <linux/writeback.h> | |
34 | #include <linux/statfs.h> | |
35 | #include <linux/compat.h> | |
9ebefb18 | 36 | #include <linux/bit_spinlock.h> |
92fee66d | 37 | #include <linux/version.h> |
5103e947 | 38 | #include <linux/xattr.h> |
33268eaf | 39 | #include <linux/posix_acl.h> |
39279cc3 CM |
40 | #include "ctree.h" |
41 | #include "disk-io.h" | |
42 | #include "transaction.h" | |
43 | #include "btrfs_inode.h" | |
44 | #include "ioctl.h" | |
45 | #include "print-tree.h" | |
0b86a832 | 46 | #include "volumes.h" |
e6dcd2dc | 47 | #include "ordered-data.h" |
39279cc3 CM |
48 | |
49 | struct btrfs_iget_args { | |
50 | u64 ino; | |
51 | struct btrfs_root *root; | |
52 | }; | |
53 | ||
54 | static struct inode_operations btrfs_dir_inode_operations; | |
55 | static struct inode_operations btrfs_symlink_inode_operations; | |
56 | static struct inode_operations btrfs_dir_ro_inode_operations; | |
618e21d5 | 57 | static struct inode_operations btrfs_special_inode_operations; |
39279cc3 CM |
58 | static struct inode_operations btrfs_file_inode_operations; |
59 | static struct address_space_operations btrfs_aops; | |
60 | static struct address_space_operations btrfs_symlink_aops; | |
61 | static struct file_operations btrfs_dir_file_operations; | |
d1310b2e | 62 | static struct extent_io_ops btrfs_extent_io_ops; |
39279cc3 CM |
63 | |
64 | static struct kmem_cache *btrfs_inode_cachep; | |
65 | struct kmem_cache *btrfs_trans_handle_cachep; | |
66 | struct kmem_cache *btrfs_transaction_cachep; | |
67 | struct kmem_cache *btrfs_bit_radix_cachep; | |
68 | struct kmem_cache *btrfs_path_cachep; | |
69 | ||
70 | #define S_SHIFT 12 | |
71 | static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = { | |
72 | [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE, | |
73 | [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR, | |
74 | [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV, | |
75 | [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV, | |
76 | [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO, | |
77 | [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK, | |
78 | [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK, | |
79 | }; | |
80 | ||
7b128766 JB |
81 | static void btrfs_truncate(struct inode *inode); |
82 | ||
1832a6d5 CM |
83 | int btrfs_check_free_space(struct btrfs_root *root, u64 num_required, |
84 | int for_del) | |
85 | { | |
a2135011 CM |
86 | u64 total; |
87 | u64 used; | |
1832a6d5 | 88 | u64 thresh; |
bcbfce8a | 89 | unsigned long flags; |
1832a6d5 CM |
90 | int ret = 0; |
91 | ||
a2135011 CM |
92 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
93 | total = btrfs_super_total_bytes(&root->fs_info->super_copy); | |
94 | used = btrfs_super_bytes_used(&root->fs_info->super_copy); | |
1832a6d5 | 95 | if (for_del) |
f9ef6604 | 96 | thresh = total * 90; |
1832a6d5 | 97 | else |
f9ef6604 CM |
98 | thresh = total * 85; |
99 | ||
100 | do_div(thresh, 100); | |
1832a6d5 | 101 | |
1832a6d5 CM |
102 | if (used + root->fs_info->delalloc_bytes + num_required > thresh) |
103 | ret = -ENOSPC; | |
bcbfce8a | 104 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
1832a6d5 CM |
105 | return ret; |
106 | } | |
107 | ||
be20aa9d | 108 | static int cow_file_range(struct inode *inode, u64 start, u64 end) |
b888db2b CM |
109 | { |
110 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
111 | struct btrfs_trans_handle *trans; | |
b888db2b | 112 | u64 alloc_hint = 0; |
db94535d | 113 | u64 num_bytes; |
c59f8951 | 114 | u64 cur_alloc_size; |
db94535d | 115 | u64 blocksize = root->sectorsize; |
d1310b2e | 116 | u64 orig_num_bytes; |
be20aa9d | 117 | struct btrfs_key ins; |
e6dcd2dc CM |
118 | struct extent_map *em; |
119 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
120 | int ret = 0; | |
b888db2b | 121 | |
f9295749 | 122 | trans = btrfs_join_transaction(root, 1); |
b888db2b | 123 | BUG_ON(!trans); |
be20aa9d CM |
124 | btrfs_set_trans_block_group(trans, inode); |
125 | ||
db94535d | 126 | num_bytes = (end - start + blocksize) & ~(blocksize - 1); |
be20aa9d | 127 | num_bytes = max(blocksize, num_bytes); |
d1310b2e | 128 | orig_num_bytes = num_bytes; |
db94535d | 129 | |
179e29e4 CM |
130 | if (alloc_hint == EXTENT_MAP_INLINE) |
131 | goto out; | |
132 | ||
3b951516 | 133 | BUG_ON(num_bytes > btrfs_super_total_bytes(&root->fs_info->super_copy)); |
e5a2217e | 134 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
e6dcd2dc | 135 | btrfs_drop_extent_cache(inode, start, start + num_bytes - 1); |
e5a2217e | 136 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
3b951516 | 137 | |
c59f8951 CM |
138 | while(num_bytes > 0) { |
139 | cur_alloc_size = min(num_bytes, root->fs_info->max_extent); | |
e6dcd2dc CM |
140 | ret = btrfs_reserve_extent(trans, root, cur_alloc_size, |
141 | root->sectorsize, 0, 0, | |
142 | (u64)-1, &ins, 1); | |
c59f8951 CM |
143 | if (ret) { |
144 | WARN_ON(1); | |
145 | goto out; | |
146 | } | |
e6dcd2dc CM |
147 | em = alloc_extent_map(GFP_NOFS); |
148 | em->start = start; | |
149 | em->len = ins.offset; | |
150 | em->block_start = ins.objectid; | |
151 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
e5a2217e | 152 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
7f3c74fb | 153 | set_bit(EXTENT_FLAG_PINNED, &em->flags); |
e6dcd2dc CM |
154 | while(1) { |
155 | spin_lock(&em_tree->lock); | |
156 | ret = add_extent_mapping(em_tree, em); | |
157 | spin_unlock(&em_tree->lock); | |
158 | if (ret != -EEXIST) { | |
159 | free_extent_map(em); | |
160 | break; | |
161 | } | |
162 | btrfs_drop_extent_cache(inode, start, | |
163 | start + ins.offset - 1); | |
164 | } | |
e5a2217e | 165 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
e6dcd2dc | 166 | |
98d20f67 | 167 | cur_alloc_size = ins.offset; |
e6dcd2dc | 168 | ret = btrfs_add_ordered_extent(inode, start, ins.objectid, |
7ea394f1 | 169 | ins.offset, 0); |
e6dcd2dc | 170 | BUG_ON(ret); |
3b951516 CM |
171 | if (num_bytes < cur_alloc_size) { |
172 | printk("num_bytes %Lu cur_alloc %Lu\n", num_bytes, | |
173 | cur_alloc_size); | |
174 | break; | |
175 | } | |
c59f8951 CM |
176 | num_bytes -= cur_alloc_size; |
177 | alloc_hint = ins.objectid + ins.offset; | |
178 | start += cur_alloc_size; | |
b888db2b | 179 | } |
b888db2b CM |
180 | out: |
181 | btrfs_end_transaction(trans, root); | |
be20aa9d CM |
182 | return ret; |
183 | } | |
184 | ||
185 | static int run_delalloc_nocow(struct inode *inode, u64 start, u64 end) | |
186 | { | |
187 | u64 extent_start; | |
188 | u64 extent_end; | |
189 | u64 bytenr; | |
1832a6d5 | 190 | u64 loops = 0; |
c31f8830 | 191 | u64 total_fs_bytes; |
be20aa9d | 192 | struct btrfs_root *root = BTRFS_I(inode)->root; |
a68d5933 | 193 | struct btrfs_block_group_cache *block_group; |
7ea394f1 | 194 | struct btrfs_trans_handle *trans; |
be20aa9d CM |
195 | struct extent_buffer *leaf; |
196 | int found_type; | |
197 | struct btrfs_path *path; | |
198 | struct btrfs_file_extent_item *item; | |
199 | int ret; | |
7ea394f1 | 200 | int err = 0; |
be20aa9d CM |
201 | struct btrfs_key found_key; |
202 | ||
c31f8830 | 203 | total_fs_bytes = btrfs_super_total_bytes(&root->fs_info->super_copy); |
be20aa9d CM |
204 | path = btrfs_alloc_path(); |
205 | BUG_ON(!path); | |
7ea394f1 YZ |
206 | trans = btrfs_join_transaction(root, 1); |
207 | BUG_ON(!trans); | |
be20aa9d CM |
208 | again: |
209 | ret = btrfs_lookup_file_extent(NULL, root, path, | |
210 | inode->i_ino, start, 0); | |
211 | if (ret < 0) { | |
7ea394f1 YZ |
212 | err = ret; |
213 | goto out; | |
be20aa9d CM |
214 | } |
215 | ||
be20aa9d CM |
216 | if (ret != 0) { |
217 | if (path->slots[0] == 0) | |
218 | goto not_found; | |
219 | path->slots[0]--; | |
220 | } | |
221 | ||
222 | leaf = path->nodes[0]; | |
223 | item = btrfs_item_ptr(leaf, path->slots[0], | |
224 | struct btrfs_file_extent_item); | |
225 | ||
226 | /* are we inside the extent that was found? */ | |
227 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
228 | found_type = btrfs_key_type(&found_key); | |
229 | if (found_key.objectid != inode->i_ino || | |
bbaf549e | 230 | found_type != BTRFS_EXTENT_DATA_KEY) |
be20aa9d | 231 | goto not_found; |
be20aa9d CM |
232 | |
233 | found_type = btrfs_file_extent_type(leaf, item); | |
234 | extent_start = found_key.offset; | |
235 | if (found_type == BTRFS_FILE_EXTENT_REG) { | |
c31f8830 CM |
236 | u64 extent_num_bytes; |
237 | ||
238 | extent_num_bytes = btrfs_file_extent_num_bytes(leaf, item); | |
239 | extent_end = extent_start + extent_num_bytes; | |
be20aa9d CM |
240 | err = 0; |
241 | ||
1832a6d5 CM |
242 | if (loops && start != extent_start) |
243 | goto not_found; | |
244 | ||
be20aa9d CM |
245 | if (start < extent_start || start >= extent_end) |
246 | goto not_found; | |
247 | ||
be20aa9d CM |
248 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
249 | if (bytenr == 0) | |
250 | goto not_found; | |
251 | ||
7ea394f1 | 252 | if (btrfs_cross_ref_exists(trans, root, &found_key, bytenr)) |
a68d5933 | 253 | goto not_found; |
c31f8830 CM |
254 | /* |
255 | * we may be called by the resizer, make sure we're inside | |
256 | * the limits of the FS | |
257 | */ | |
a68d5933 CM |
258 | block_group = btrfs_lookup_block_group(root->fs_info, |
259 | bytenr); | |
260 | if (!block_group || block_group->ro) | |
c31f8830 CM |
261 | goto not_found; |
262 | ||
7ea394f1 YZ |
263 | bytenr += btrfs_file_extent_offset(leaf, item); |
264 | extent_num_bytes = min(end + 1, extent_end) - start; | |
265 | ret = btrfs_add_ordered_extent(inode, start, bytenr, | |
266 | extent_num_bytes, 1); | |
267 | if (ret) { | |
268 | err = ret; | |
269 | goto out; | |
270 | } | |
271 | ||
272 | btrfs_release_path(root, path); | |
be20aa9d | 273 | start = extent_end; |
7ea394f1 YZ |
274 | if (start <= end) { |
275 | loops++; | |
276 | goto again; | |
277 | } | |
bd09835d | 278 | } else { |
7ea394f1 YZ |
279 | not_found: |
280 | btrfs_end_transaction(trans, root); | |
be20aa9d | 281 | btrfs_free_path(path); |
7ea394f1 | 282 | return cow_file_range(inode, start, end); |
be20aa9d | 283 | } |
7ea394f1 YZ |
284 | out: |
285 | WARN_ON(err); | |
286 | btrfs_end_transaction(trans, root); | |
287 | btrfs_free_path(path); | |
288 | return err; | |
be20aa9d CM |
289 | } |
290 | ||
291 | static int run_delalloc_range(struct inode *inode, u64 start, u64 end) | |
292 | { | |
293 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
294 | int ret; | |
a2135011 | 295 | |
b98b6767 Y |
296 | if (btrfs_test_opt(root, NODATACOW) || |
297 | btrfs_test_flag(inode, NODATACOW)) | |
be20aa9d CM |
298 | ret = run_delalloc_nocow(inode, start, end); |
299 | else | |
300 | ret = cow_file_range(inode, start, end); | |
1832a6d5 | 301 | |
b888db2b CM |
302 | return ret; |
303 | } | |
304 | ||
291d673e | 305 | int btrfs_set_bit_hook(struct inode *inode, u64 start, u64 end, |
b0c68f8b | 306 | unsigned long old, unsigned long bits) |
291d673e | 307 | { |
bcbfce8a | 308 | unsigned long flags; |
b0c68f8b | 309 | if (!(old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 310 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a | 311 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); |
9069218d | 312 | BTRFS_I(inode)->delalloc_bytes += end - start + 1; |
291d673e | 313 | root->fs_info->delalloc_bytes += end - start + 1; |
ea8c2819 CM |
314 | if (list_empty(&BTRFS_I(inode)->delalloc_inodes)) { |
315 | list_add_tail(&BTRFS_I(inode)->delalloc_inodes, | |
316 | &root->fs_info->delalloc_inodes); | |
317 | } | |
bcbfce8a | 318 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
319 | } |
320 | return 0; | |
321 | } | |
322 | ||
323 | int btrfs_clear_bit_hook(struct inode *inode, u64 start, u64 end, | |
b0c68f8b | 324 | unsigned long old, unsigned long bits) |
291d673e | 325 | { |
b0c68f8b | 326 | if ((old & EXTENT_DELALLOC) && (bits & EXTENT_DELALLOC)) { |
291d673e | 327 | struct btrfs_root *root = BTRFS_I(inode)->root; |
bcbfce8a CM |
328 | unsigned long flags; |
329 | ||
330 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
b0c68f8b CM |
331 | if (end - start + 1 > root->fs_info->delalloc_bytes) { |
332 | printk("warning: delalloc account %Lu %Lu\n", | |
333 | end - start + 1, root->fs_info->delalloc_bytes); | |
334 | root->fs_info->delalloc_bytes = 0; | |
9069218d | 335 | BTRFS_I(inode)->delalloc_bytes = 0; |
b0c68f8b CM |
336 | } else { |
337 | root->fs_info->delalloc_bytes -= end - start + 1; | |
9069218d | 338 | BTRFS_I(inode)->delalloc_bytes -= end - start + 1; |
b0c68f8b | 339 | } |
ea8c2819 CM |
340 | if (BTRFS_I(inode)->delalloc_bytes == 0 && |
341 | !list_empty(&BTRFS_I(inode)->delalloc_inodes)) { | |
342 | list_del_init(&BTRFS_I(inode)->delalloc_inodes); | |
343 | } | |
bcbfce8a | 344 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); |
291d673e CM |
345 | } |
346 | return 0; | |
347 | } | |
348 | ||
239b14b3 CM |
349 | int btrfs_merge_bio_hook(struct page *page, unsigned long offset, |
350 | size_t size, struct bio *bio) | |
351 | { | |
352 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
353 | struct btrfs_mapping_tree *map_tree; | |
239b14b3 | 354 | u64 logical = bio->bi_sector << 9; |
239b14b3 CM |
355 | u64 length = 0; |
356 | u64 map_length; | |
239b14b3 CM |
357 | int ret; |
358 | ||
f2d8d74d | 359 | length = bio->bi_size; |
239b14b3 CM |
360 | map_tree = &root->fs_info->mapping_tree; |
361 | map_length = length; | |
cea9e445 | 362 | ret = btrfs_map_block(map_tree, READ, logical, |
f188591e | 363 | &map_length, NULL, 0); |
cea9e445 | 364 | |
239b14b3 | 365 | if (map_length < length + size) { |
239b14b3 CM |
366 | return 1; |
367 | } | |
368 | return 0; | |
369 | } | |
370 | ||
44b8bd7e | 371 | int __btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
f188591e | 372 | int mirror_num) |
065631f6 | 373 | { |
065631f6 | 374 | struct btrfs_root *root = BTRFS_I(inode)->root; |
065631f6 | 375 | int ret = 0; |
e015640f | 376 | |
3edf7d33 | 377 | ret = btrfs_csum_one_bio(root, inode, bio); |
44b8bd7e | 378 | BUG_ON(ret); |
e015640f | 379 | |
8b712842 | 380 | return btrfs_map_bio(root, rw, bio, mirror_num, 1); |
44b8bd7e CM |
381 | } |
382 | ||
383 | int btrfs_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, | |
384 | int mirror_num) | |
385 | { | |
386 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
387 | int ret = 0; | |
388 | ||
e6dcd2dc CM |
389 | ret = btrfs_bio_wq_end_io(root->fs_info, bio, 0); |
390 | BUG_ON(ret); | |
065631f6 | 391 | |
7ea394f1 YZ |
392 | if (btrfs_test_opt(root, NODATASUM) || |
393 | btrfs_test_flag(inode, NODATASUM)) { | |
394 | goto mapit; | |
395 | } | |
396 | ||
4d1b5fb4 CM |
397 | if (!(rw & (1 << BIO_RW))) { |
398 | btrfs_lookup_bio_sums(root, inode, bio); | |
399 | goto mapit; | |
400 | } | |
44b8bd7e CM |
401 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
402 | inode, rw, bio, mirror_num, | |
403 | __btrfs_submit_bio_hook); | |
0b86a832 | 404 | mapit: |
8b712842 | 405 | return btrfs_map_bio(root, rw, bio, mirror_num, 0); |
065631f6 | 406 | } |
6885f308 | 407 | |
ba1da2f4 | 408 | static noinline int add_pending_csums(struct btrfs_trans_handle *trans, |
e6dcd2dc CM |
409 | struct inode *inode, u64 file_offset, |
410 | struct list_head *list) | |
411 | { | |
412 | struct list_head *cur; | |
413 | struct btrfs_ordered_sum *sum; | |
414 | ||
415 | btrfs_set_trans_block_group(trans, inode); | |
ba1da2f4 | 416 | list_for_each(cur, list) { |
e6dcd2dc | 417 | sum = list_entry(cur, struct btrfs_ordered_sum, list); |
e6dcd2dc CM |
418 | btrfs_csum_file_blocks(trans, BTRFS_I(inode)->root, |
419 | inode, sum); | |
e6dcd2dc CM |
420 | } |
421 | return 0; | |
422 | } | |
423 | ||
ea8c2819 CM |
424 | int btrfs_set_extent_delalloc(struct inode *inode, u64 start, u64 end) |
425 | { | |
426 | return set_extent_delalloc(&BTRFS_I(inode)->io_tree, start, end, | |
427 | GFP_NOFS); | |
428 | } | |
429 | ||
247e743c CM |
430 | struct btrfs_writepage_fixup { |
431 | struct page *page; | |
432 | struct btrfs_work work; | |
433 | }; | |
434 | ||
435 | /* see btrfs_writepage_start_hook for details on why this is required */ | |
436 | void btrfs_writepage_fixup_worker(struct btrfs_work *work) | |
437 | { | |
438 | struct btrfs_writepage_fixup *fixup; | |
439 | struct btrfs_ordered_extent *ordered; | |
440 | struct page *page; | |
441 | struct inode *inode; | |
442 | u64 page_start; | |
443 | u64 page_end; | |
444 | ||
445 | fixup = container_of(work, struct btrfs_writepage_fixup, work); | |
446 | page = fixup->page; | |
4a096752 | 447 | again: |
247e743c CM |
448 | lock_page(page); |
449 | if (!page->mapping || !PageDirty(page) || !PageChecked(page)) { | |
450 | ClearPageChecked(page); | |
451 | goto out_page; | |
452 | } | |
453 | ||
454 | inode = page->mapping->host; | |
455 | page_start = page_offset(page); | |
456 | page_end = page_offset(page) + PAGE_CACHE_SIZE - 1; | |
457 | ||
458 | lock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); | |
4a096752 CM |
459 | |
460 | /* already ordered? We're done */ | |
461 | if (test_range_bit(&BTRFS_I(inode)->io_tree, page_start, page_end, | |
462 | EXTENT_ORDERED, 0)) { | |
247e743c | 463 | goto out; |
4a096752 CM |
464 | } |
465 | ||
466 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
467 | if (ordered) { | |
468 | unlock_extent(&BTRFS_I(inode)->io_tree, page_start, | |
469 | page_end, GFP_NOFS); | |
470 | unlock_page(page); | |
471 | btrfs_start_ordered_extent(inode, ordered, 1); | |
472 | goto again; | |
473 | } | |
247e743c | 474 | |
ea8c2819 | 475 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
247e743c CM |
476 | ClearPageChecked(page); |
477 | out: | |
478 | unlock_extent(&BTRFS_I(inode)->io_tree, page_start, page_end, GFP_NOFS); | |
479 | out_page: | |
480 | unlock_page(page); | |
481 | page_cache_release(page); | |
482 | } | |
483 | ||
484 | /* | |
485 | * There are a few paths in the higher layers of the kernel that directly | |
486 | * set the page dirty bit without asking the filesystem if it is a | |
487 | * good idea. This causes problems because we want to make sure COW | |
488 | * properly happens and the data=ordered rules are followed. | |
489 | * | |
490 | * In our case any range that doesn't have the EXTENT_ORDERED bit set | |
491 | * hasn't been properly setup for IO. We kick off an async process | |
492 | * to fix it up. The async helper will wait for ordered extents, set | |
493 | * the delalloc bit and make it safe to write the page. | |
494 | */ | |
495 | int btrfs_writepage_start_hook(struct page *page, u64 start, u64 end) | |
496 | { | |
497 | struct inode *inode = page->mapping->host; | |
498 | struct btrfs_writepage_fixup *fixup; | |
499 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
500 | int ret; | |
501 | ||
502 | ret = test_range_bit(&BTRFS_I(inode)->io_tree, start, end, | |
503 | EXTENT_ORDERED, 0); | |
504 | if (ret) | |
505 | return 0; | |
506 | ||
507 | if (PageChecked(page)) | |
508 | return -EAGAIN; | |
509 | ||
510 | fixup = kzalloc(sizeof(*fixup), GFP_NOFS); | |
511 | if (!fixup) | |
512 | return -EAGAIN; | |
f421950f | 513 | |
247e743c CM |
514 | SetPageChecked(page); |
515 | page_cache_get(page); | |
516 | fixup->work.func = btrfs_writepage_fixup_worker; | |
517 | fixup->page = page; | |
518 | btrfs_queue_worker(&root->fs_info->fixup_workers, &fixup->work); | |
519 | return -EAGAIN; | |
520 | } | |
521 | ||
211f90e6 | 522 | static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end) |
e6dcd2dc | 523 | { |
e6dcd2dc CM |
524 | struct btrfs_root *root = BTRFS_I(inode)->root; |
525 | struct btrfs_trans_handle *trans; | |
526 | struct btrfs_ordered_extent *ordered_extent; | |
527 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
528 | u64 alloc_hint = 0; | |
529 | struct list_head list; | |
530 | struct btrfs_key ins; | |
531 | int ret; | |
532 | ||
533 | ret = btrfs_dec_test_ordered_pending(inode, start, end - start + 1); | |
ba1da2f4 | 534 | if (!ret) |
e6dcd2dc | 535 | return 0; |
e6dcd2dc | 536 | |
f9295749 | 537 | trans = btrfs_join_transaction(root, 1); |
e6dcd2dc CM |
538 | |
539 | ordered_extent = btrfs_lookup_ordered_extent(inode, start); | |
540 | BUG_ON(!ordered_extent); | |
7ea394f1 YZ |
541 | if (test_bit(BTRFS_ORDERED_NOCOW, &ordered_extent->flags)) |
542 | goto nocow; | |
e6dcd2dc CM |
543 | |
544 | lock_extent(io_tree, ordered_extent->file_offset, | |
545 | ordered_extent->file_offset + ordered_extent->len - 1, | |
546 | GFP_NOFS); | |
547 | ||
548 | INIT_LIST_HEAD(&list); | |
549 | ||
550 | ins.objectid = ordered_extent->start; | |
551 | ins.offset = ordered_extent->len; | |
552 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
e5a2217e | 553 | |
e6dcd2dc CM |
554 | ret = btrfs_alloc_reserved_extent(trans, root, root->root_key.objectid, |
555 | trans->transid, inode->i_ino, | |
556 | ordered_extent->file_offset, &ins); | |
557 | BUG_ON(ret); | |
ee6e6504 CM |
558 | |
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); | |
567 | ret = btrfs_insert_file_extent(trans, root, inode->i_ino, | |
568 | ordered_extent->file_offset, | |
569 | ordered_extent->start, | |
570 | ordered_extent->len, | |
571 | ordered_extent->len, 0); | |
572 | BUG_ON(ret); | |
7f3c74fb | 573 | |
e6dcd2dc CM |
574 | btrfs_drop_extent_cache(inode, ordered_extent->file_offset, |
575 | ordered_extent->file_offset + | |
576 | ordered_extent->len - 1); | |
ee6e6504 CM |
577 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
578 | ||
e6dcd2dc CM |
579 | inode->i_blocks += ordered_extent->len >> 9; |
580 | unlock_extent(io_tree, ordered_extent->file_offset, | |
581 | ordered_extent->file_offset + ordered_extent->len - 1, | |
582 | GFP_NOFS); | |
7ea394f1 | 583 | nocow: |
e6dcd2dc CM |
584 | add_pending_csums(trans, inode, ordered_extent->file_offset, |
585 | &ordered_extent->list); | |
586 | ||
dbe674a9 | 587 | btrfs_ordered_update_i_size(inode, ordered_extent); |
e6dcd2dc | 588 | btrfs_remove_ordered_extent(inode, ordered_extent); |
7f3c74fb | 589 | |
e6dcd2dc CM |
590 | /* once for us */ |
591 | btrfs_put_ordered_extent(ordered_extent); | |
592 | /* once for the tree */ | |
593 | btrfs_put_ordered_extent(ordered_extent); | |
594 | ||
595 | btrfs_update_inode(trans, root, inode); | |
596 | btrfs_end_transaction(trans, root); | |
597 | return 0; | |
598 | } | |
599 | ||
211f90e6 CM |
600 | int btrfs_writepage_end_io_hook(struct page *page, u64 start, u64 end, |
601 | struct extent_state *state, int uptodate) | |
602 | { | |
603 | return btrfs_finish_ordered_io(page->mapping->host, start, end); | |
604 | } | |
605 | ||
7e38326f CM |
606 | struct io_failure_record { |
607 | struct page *page; | |
608 | u64 start; | |
609 | u64 len; | |
610 | u64 logical; | |
611 | int last_mirror; | |
612 | }; | |
613 | ||
1259ab75 CM |
614 | int btrfs_io_failed_hook(struct bio *failed_bio, |
615 | struct page *page, u64 start, u64 end, | |
616 | struct extent_state *state) | |
7e38326f CM |
617 | { |
618 | struct io_failure_record *failrec = NULL; | |
619 | u64 private; | |
620 | struct extent_map *em; | |
621 | struct inode *inode = page->mapping->host; | |
622 | struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; | |
3b951516 | 623 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
7e38326f CM |
624 | struct bio *bio; |
625 | int num_copies; | |
626 | int ret; | |
1259ab75 | 627 | int rw; |
7e38326f CM |
628 | u64 logical; |
629 | ||
630 | ret = get_state_private(failure_tree, start, &private); | |
631 | if (ret) { | |
7e38326f CM |
632 | failrec = kmalloc(sizeof(*failrec), GFP_NOFS); |
633 | if (!failrec) | |
634 | return -ENOMEM; | |
635 | failrec->start = start; | |
636 | failrec->len = end - start + 1; | |
637 | failrec->last_mirror = 0; | |
638 | ||
3b951516 CM |
639 | spin_lock(&em_tree->lock); |
640 | em = lookup_extent_mapping(em_tree, start, failrec->len); | |
641 | if (em->start > start || em->start + em->len < start) { | |
642 | free_extent_map(em); | |
643 | em = NULL; | |
644 | } | |
645 | spin_unlock(&em_tree->lock); | |
7e38326f CM |
646 | |
647 | if (!em || IS_ERR(em)) { | |
648 | kfree(failrec); | |
649 | return -EIO; | |
650 | } | |
651 | logical = start - em->start; | |
652 | logical = em->block_start + logical; | |
653 | failrec->logical = logical; | |
654 | free_extent_map(em); | |
655 | set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | | |
656 | EXTENT_DIRTY, GFP_NOFS); | |
587f7704 CM |
657 | set_state_private(failure_tree, start, |
658 | (u64)(unsigned long)failrec); | |
7e38326f | 659 | } else { |
587f7704 | 660 | failrec = (struct io_failure_record *)(unsigned long)private; |
7e38326f CM |
661 | } |
662 | num_copies = btrfs_num_copies( | |
663 | &BTRFS_I(inode)->root->fs_info->mapping_tree, | |
664 | failrec->logical, failrec->len); | |
665 | failrec->last_mirror++; | |
666 | if (!state) { | |
667 | spin_lock_irq(&BTRFS_I(inode)->io_tree.lock); | |
668 | state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, | |
669 | failrec->start, | |
670 | EXTENT_LOCKED); | |
671 | if (state && state->start != failrec->start) | |
672 | state = NULL; | |
673 | spin_unlock_irq(&BTRFS_I(inode)->io_tree.lock); | |
674 | } | |
675 | if (!state || failrec->last_mirror > num_copies) { | |
676 | set_state_private(failure_tree, failrec->start, 0); | |
677 | clear_extent_bits(failure_tree, failrec->start, | |
678 | failrec->start + failrec->len - 1, | |
679 | EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); | |
680 | kfree(failrec); | |
681 | return -EIO; | |
682 | } | |
683 | bio = bio_alloc(GFP_NOFS, 1); | |
684 | bio->bi_private = state; | |
685 | bio->bi_end_io = failed_bio->bi_end_io; | |
686 | bio->bi_sector = failrec->logical >> 9; | |
687 | bio->bi_bdev = failed_bio->bi_bdev; | |
e1c4b745 | 688 | bio->bi_size = 0; |
7e38326f | 689 | bio_add_page(bio, page, failrec->len, start - page_offset(page)); |
1259ab75 CM |
690 | if (failed_bio->bi_rw & (1 << BIO_RW)) |
691 | rw = WRITE; | |
692 | else | |
693 | rw = READ; | |
694 | ||
695 | BTRFS_I(inode)->io_tree.ops->submit_bio_hook(inode, rw, bio, | |
696 | failrec->last_mirror); | |
697 | return 0; | |
698 | } | |
699 | ||
700 | int btrfs_clean_io_failures(struct inode *inode, u64 start) | |
701 | { | |
702 | u64 private; | |
703 | u64 private_failure; | |
704 | struct io_failure_record *failure; | |
705 | int ret; | |
706 | ||
707 | private = 0; | |
708 | if (count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, | |
709 | (u64)-1, 1, EXTENT_DIRTY)) { | |
710 | ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, | |
711 | start, &private_failure); | |
712 | if (ret == 0) { | |
713 | failure = (struct io_failure_record *)(unsigned long) | |
714 | private_failure; | |
715 | set_state_private(&BTRFS_I(inode)->io_failure_tree, | |
716 | failure->start, 0); | |
717 | clear_extent_bits(&BTRFS_I(inode)->io_failure_tree, | |
718 | failure->start, | |
719 | failure->start + failure->len - 1, | |
720 | EXTENT_DIRTY | EXTENT_LOCKED, | |
721 | GFP_NOFS); | |
722 | kfree(failure); | |
723 | } | |
724 | } | |
7e38326f CM |
725 | return 0; |
726 | } | |
727 | ||
70dec807 CM |
728 | int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
729 | struct extent_state *state) | |
07157aac | 730 | { |
35ebb934 | 731 | size_t offset = start - ((u64)page->index << PAGE_CACHE_SHIFT); |
07157aac | 732 | struct inode *inode = page->mapping->host; |
d1310b2e | 733 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
07157aac | 734 | char *kaddr; |
aadfeb6e | 735 | u64 private = ~(u32)0; |
07157aac | 736 | int ret; |
ff79f819 CM |
737 | struct btrfs_root *root = BTRFS_I(inode)->root; |
738 | u32 csum = ~(u32)0; | |
bbf0d006 | 739 | unsigned long flags; |
d1310b2e | 740 | |
b98b6767 Y |
741 | if (btrfs_test_opt(root, NODATASUM) || |
742 | btrfs_test_flag(inode, NODATASUM)) | |
b6cda9bc | 743 | return 0; |
c2e639f0 | 744 | if (state && state->start == start) { |
70dec807 CM |
745 | private = state->private; |
746 | ret = 0; | |
747 | } else { | |
748 | ret = get_state_private(io_tree, start, &private); | |
749 | } | |
bbf0d006 | 750 | local_irq_save(flags); |
07157aac CM |
751 | kaddr = kmap_atomic(page, KM_IRQ0); |
752 | if (ret) { | |
753 | goto zeroit; | |
754 | } | |
ff79f819 CM |
755 | csum = btrfs_csum_data(root, kaddr + offset, csum, end - start + 1); |
756 | btrfs_csum_final(csum, (char *)&csum); | |
757 | if (csum != private) { | |
07157aac CM |
758 | goto zeroit; |
759 | } | |
760 | kunmap_atomic(kaddr, KM_IRQ0); | |
bbf0d006 | 761 | local_irq_restore(flags); |
7e38326f CM |
762 | |
763 | /* if the io failure tree for this inode is non-empty, | |
764 | * check to see if we've recovered from a failed IO | |
765 | */ | |
1259ab75 | 766 | btrfs_clean_io_failures(inode, start); |
07157aac CM |
767 | return 0; |
768 | ||
769 | zeroit: | |
aadfeb6e CM |
770 | printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n", |
771 | page->mapping->host->i_ino, (unsigned long long)start, csum, | |
772 | private); | |
db94535d CM |
773 | memset(kaddr + offset, 1, end - start + 1); |
774 | flush_dcache_page(page); | |
07157aac | 775 | kunmap_atomic(kaddr, KM_IRQ0); |
bbf0d006 | 776 | local_irq_restore(flags); |
3b951516 CM |
777 | if (private == 0) |
778 | return 0; | |
7e38326f | 779 | return -EIO; |
07157aac | 780 | } |
b888db2b | 781 | |
7b128766 JB |
782 | /* |
783 | * This creates an orphan entry for the given inode in case something goes | |
784 | * wrong in the middle of an unlink/truncate. | |
785 | */ | |
786 | int btrfs_orphan_add(struct btrfs_trans_handle *trans, struct inode *inode) | |
787 | { | |
788 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
789 | int ret = 0; | |
790 | ||
bcc63abb | 791 | spin_lock(&root->list_lock); |
7b128766 JB |
792 | |
793 | /* already on the orphan list, we're good */ | |
794 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { | |
bcc63abb | 795 | spin_unlock(&root->list_lock); |
7b128766 JB |
796 | return 0; |
797 | } | |
798 | ||
799 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); | |
800 | ||
bcc63abb | 801 | spin_unlock(&root->list_lock); |
7b128766 JB |
802 | |
803 | /* | |
804 | * insert an orphan item to track this unlinked/truncated file | |
805 | */ | |
806 | ret = btrfs_insert_orphan_item(trans, root, inode->i_ino); | |
807 | ||
808 | return ret; | |
809 | } | |
810 | ||
811 | /* | |
812 | * We have done the truncate/delete so we can go ahead and remove the orphan | |
813 | * item for this particular inode. | |
814 | */ | |
815 | int btrfs_orphan_del(struct btrfs_trans_handle *trans, struct inode *inode) | |
816 | { | |
817 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
818 | int ret = 0; | |
819 | ||
bcc63abb | 820 | spin_lock(&root->list_lock); |
7b128766 JB |
821 | |
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_del_init(&BTRFS_I(inode)->i_orphan); | |
828 | if (!trans) { | |
bcc63abb | 829 | spin_unlock(&root->list_lock); |
7b128766 JB |
830 | return 0; |
831 | } | |
832 | ||
bcc63abb | 833 | spin_unlock(&root->list_lock); |
7b128766 JB |
834 | |
835 | ret = btrfs_del_orphan_item(trans, root, inode->i_ino); | |
836 | ||
837 | return ret; | |
838 | } | |
839 | ||
840 | /* | |
841 | * this cleans up any orphans that may be left on the list from the last use | |
842 | * of this root. | |
843 | */ | |
844 | void btrfs_orphan_cleanup(struct btrfs_root *root) | |
845 | { | |
846 | struct btrfs_path *path; | |
847 | struct extent_buffer *leaf; | |
848 | struct btrfs_item *item; | |
849 | struct btrfs_key key, found_key; | |
850 | struct btrfs_trans_handle *trans; | |
851 | struct inode *inode; | |
852 | int ret = 0, nr_unlink = 0, nr_truncate = 0; | |
853 | ||
854 | /* don't do orphan cleanup if the fs is readonly. */ | |
855 | if (root->inode->i_sb->s_flags & MS_RDONLY) | |
856 | return; | |
857 | ||
858 | path = btrfs_alloc_path(); | |
859 | if (!path) | |
860 | return; | |
861 | path->reada = -1; | |
862 | ||
863 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
864 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); | |
865 | key.offset = (u64)-1; | |
866 | ||
867 | trans = btrfs_start_transaction(root, 1); | |
868 | btrfs_set_trans_block_group(trans, root->inode); | |
869 | ||
870 | while (1) { | |
871 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
872 | if (ret < 0) { | |
873 | printk(KERN_ERR "Error searching slot for orphan: %d" | |
874 | "\n", ret); | |
875 | break; | |
876 | } | |
877 | ||
878 | /* | |
879 | * if ret == 0 means we found what we were searching for, which | |
880 | * is weird, but possible, so only screw with path if we didnt | |
881 | * find the key and see if we have stuff that matches | |
882 | */ | |
883 | if (ret > 0) { | |
884 | if (path->slots[0] == 0) | |
885 | break; | |
886 | path->slots[0]--; | |
887 | } | |
888 | ||
889 | /* pull out the item */ | |
890 | leaf = path->nodes[0]; | |
891 | item = btrfs_item_nr(leaf, path->slots[0]); | |
892 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
893 | ||
894 | /* make sure the item matches what we want */ | |
895 | if (found_key.objectid != BTRFS_ORPHAN_OBJECTID) | |
896 | break; | |
897 | if (btrfs_key_type(&found_key) != BTRFS_ORPHAN_ITEM_KEY) | |
898 | break; | |
899 | ||
900 | /* release the path since we're done with it */ | |
901 | btrfs_release_path(root, path); | |
902 | ||
903 | /* | |
904 | * this is where we are basically btrfs_lookup, without the | |
905 | * crossing root thing. we store the inode number in the | |
906 | * offset of the orphan item. | |
907 | */ | |
908 | inode = btrfs_iget_locked(root->inode->i_sb, | |
909 | found_key.offset, root); | |
910 | if (!inode) | |
911 | break; | |
912 | ||
913 | if (inode->i_state & I_NEW) { | |
914 | BTRFS_I(inode)->root = root; | |
915 | ||
916 | /* have to set the location manually */ | |
917 | BTRFS_I(inode)->location.objectid = inode->i_ino; | |
918 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
919 | BTRFS_I(inode)->location.offset = 0; | |
920 | ||
921 | btrfs_read_locked_inode(inode); | |
922 | unlock_new_inode(inode); | |
923 | } | |
924 | ||
925 | /* | |
926 | * add this inode to the orphan list so btrfs_orphan_del does | |
927 | * the proper thing when we hit it | |
928 | */ | |
bcc63abb | 929 | spin_lock(&root->list_lock); |
7b128766 | 930 | list_add(&BTRFS_I(inode)->i_orphan, &root->orphan_list); |
bcc63abb | 931 | spin_unlock(&root->list_lock); |
7b128766 JB |
932 | |
933 | /* | |
934 | * if this is a bad inode, means we actually succeeded in | |
935 | * removing the inode, but not the orphan record, which means | |
936 | * we need to manually delete the orphan since iput will just | |
937 | * do a destroy_inode | |
938 | */ | |
939 | if (is_bad_inode(inode)) { | |
940 | btrfs_orphan_del(trans, inode); | |
941 | iput(inode); | |
942 | continue; | |
943 | } | |
944 | ||
945 | /* if we have links, this was a truncate, lets do that */ | |
946 | if (inode->i_nlink) { | |
947 | nr_truncate++; | |
948 | btrfs_truncate(inode); | |
949 | } else { | |
950 | nr_unlink++; | |
951 | } | |
952 | ||
953 | /* this will do delete_inode and everything for us */ | |
954 | iput(inode); | |
955 | } | |
956 | ||
957 | if (nr_unlink) | |
958 | printk(KERN_INFO "btrfs: unlinked %d orphans\n", nr_unlink); | |
959 | if (nr_truncate) | |
960 | printk(KERN_INFO "btrfs: truncated %d orphans\n", nr_truncate); | |
961 | ||
962 | btrfs_free_path(path); | |
963 | btrfs_end_transaction(trans, root); | |
964 | } | |
965 | ||
39279cc3 CM |
966 | void btrfs_read_locked_inode(struct inode *inode) |
967 | { | |
968 | struct btrfs_path *path; | |
5f39d397 | 969 | struct extent_buffer *leaf; |
39279cc3 | 970 | struct btrfs_inode_item *inode_item; |
0b86a832 | 971 | struct btrfs_timespec *tspec; |
39279cc3 CM |
972 | struct btrfs_root *root = BTRFS_I(inode)->root; |
973 | struct btrfs_key location; | |
974 | u64 alloc_group_block; | |
618e21d5 | 975 | u32 rdev; |
39279cc3 CM |
976 | int ret; |
977 | ||
978 | path = btrfs_alloc_path(); | |
979 | BUG_ON(!path); | |
39279cc3 | 980 | memcpy(&location, &BTRFS_I(inode)->location, sizeof(location)); |
dc17ff8f | 981 | |
39279cc3 | 982 | ret = btrfs_lookup_inode(NULL, root, path, &location, 0); |
5f39d397 | 983 | if (ret) |
39279cc3 | 984 | goto make_bad; |
39279cc3 | 985 | |
5f39d397 CM |
986 | leaf = path->nodes[0]; |
987 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
988 | struct btrfs_inode_item); | |
989 | ||
990 | inode->i_mode = btrfs_inode_mode(leaf, inode_item); | |
991 | inode->i_nlink = btrfs_inode_nlink(leaf, inode_item); | |
992 | inode->i_uid = btrfs_inode_uid(leaf, inode_item); | |
993 | inode->i_gid = btrfs_inode_gid(leaf, inode_item); | |
dbe674a9 | 994 | btrfs_i_size_write(inode, btrfs_inode_size(leaf, inode_item)); |
5f39d397 CM |
995 | |
996 | tspec = btrfs_inode_atime(inode_item); | |
997 | inode->i_atime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
998 | inode->i_atime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
999 | ||
1000 | tspec = btrfs_inode_mtime(inode_item); | |
1001 | inode->i_mtime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
1002 | inode->i_mtime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
1003 | ||
1004 | tspec = btrfs_inode_ctime(inode_item); | |
1005 | inode->i_ctime.tv_sec = btrfs_timespec_sec(leaf, tspec); | |
1006 | inode->i_ctime.tv_nsec = btrfs_timespec_nsec(leaf, tspec); | |
1007 | ||
1008 | inode->i_blocks = btrfs_inode_nblocks(leaf, inode_item); | |
1009 | inode->i_generation = btrfs_inode_generation(leaf, inode_item); | |
618e21d5 | 1010 | inode->i_rdev = 0; |
5f39d397 CM |
1011 | rdev = btrfs_inode_rdev(leaf, inode_item); |
1012 | ||
aec7477b JB |
1013 | BTRFS_I(inode)->index_cnt = (u64)-1; |
1014 | ||
5f39d397 | 1015 | alloc_group_block = btrfs_inode_block_group(leaf, inode_item); |
39279cc3 CM |
1016 | BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info, |
1017 | alloc_group_block); | |
b98b6767 | 1018 | BTRFS_I(inode)->flags = btrfs_inode_flags(leaf, inode_item); |
e52ec0eb CM |
1019 | if (!BTRFS_I(inode)->block_group) { |
1020 | BTRFS_I(inode)->block_group = btrfs_find_block_group(root, | |
0b86a832 CM |
1021 | NULL, 0, |
1022 | BTRFS_BLOCK_GROUP_METADATA, 0); | |
e52ec0eb | 1023 | } |
39279cc3 CM |
1024 | btrfs_free_path(path); |
1025 | inode_item = NULL; | |
1026 | ||
39279cc3 | 1027 | switch (inode->i_mode & S_IFMT) { |
39279cc3 CM |
1028 | case S_IFREG: |
1029 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 1030 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
d1310b2e | 1031 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
39279cc3 CM |
1032 | inode->i_fop = &btrfs_file_operations; |
1033 | inode->i_op = &btrfs_file_inode_operations; | |
1034 | break; | |
1035 | case S_IFDIR: | |
1036 | inode->i_fop = &btrfs_dir_file_operations; | |
1037 | if (root == root->fs_info->tree_root) | |
1038 | inode->i_op = &btrfs_dir_ro_inode_operations; | |
1039 | else | |
1040 | inode->i_op = &btrfs_dir_inode_operations; | |
1041 | break; | |
1042 | case S_IFLNK: | |
1043 | inode->i_op = &btrfs_symlink_inode_operations; | |
1044 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 1045 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 | 1046 | break; |
618e21d5 JB |
1047 | default: |
1048 | init_special_inode(inode, inode->i_mode, rdev); | |
1049 | break; | |
39279cc3 CM |
1050 | } |
1051 | return; | |
1052 | ||
1053 | make_bad: | |
39279cc3 | 1054 | btrfs_free_path(path); |
39279cc3 CM |
1055 | make_bad_inode(inode); |
1056 | } | |
1057 | ||
5f39d397 CM |
1058 | static void fill_inode_item(struct extent_buffer *leaf, |
1059 | struct btrfs_inode_item *item, | |
39279cc3 CM |
1060 | struct inode *inode) |
1061 | { | |
5f39d397 CM |
1062 | btrfs_set_inode_uid(leaf, item, inode->i_uid); |
1063 | btrfs_set_inode_gid(leaf, item, inode->i_gid); | |
dbe674a9 | 1064 | btrfs_set_inode_size(leaf, item, BTRFS_I(inode)->disk_i_size); |
5f39d397 CM |
1065 | btrfs_set_inode_mode(leaf, item, inode->i_mode); |
1066 | btrfs_set_inode_nlink(leaf, item, inode->i_nlink); | |
1067 | ||
1068 | btrfs_set_timespec_sec(leaf, btrfs_inode_atime(item), | |
1069 | inode->i_atime.tv_sec); | |
1070 | btrfs_set_timespec_nsec(leaf, btrfs_inode_atime(item), | |
1071 | inode->i_atime.tv_nsec); | |
1072 | ||
1073 | btrfs_set_timespec_sec(leaf, btrfs_inode_mtime(item), | |
1074 | inode->i_mtime.tv_sec); | |
1075 | btrfs_set_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
1076 | inode->i_mtime.tv_nsec); | |
1077 | ||
1078 | btrfs_set_timespec_sec(leaf, btrfs_inode_ctime(item), | |
1079 | inode->i_ctime.tv_sec); | |
1080 | btrfs_set_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
1081 | inode->i_ctime.tv_nsec); | |
1082 | ||
1083 | btrfs_set_inode_nblocks(leaf, item, inode->i_blocks); | |
1084 | btrfs_set_inode_generation(leaf, item, inode->i_generation); | |
1085 | btrfs_set_inode_rdev(leaf, item, inode->i_rdev); | |
b98b6767 | 1086 | btrfs_set_inode_flags(leaf, item, BTRFS_I(inode)->flags); |
5f39d397 | 1087 | btrfs_set_inode_block_group(leaf, item, |
39279cc3 CM |
1088 | BTRFS_I(inode)->block_group->key.objectid); |
1089 | } | |
1090 | ||
ba1da2f4 | 1091 | int noinline btrfs_update_inode(struct btrfs_trans_handle *trans, |
39279cc3 CM |
1092 | struct btrfs_root *root, |
1093 | struct inode *inode) | |
1094 | { | |
1095 | struct btrfs_inode_item *inode_item; | |
1096 | struct btrfs_path *path; | |
5f39d397 | 1097 | struct extent_buffer *leaf; |
39279cc3 CM |
1098 | int ret; |
1099 | ||
1100 | path = btrfs_alloc_path(); | |
1101 | BUG_ON(!path); | |
39279cc3 CM |
1102 | ret = btrfs_lookup_inode(trans, root, path, |
1103 | &BTRFS_I(inode)->location, 1); | |
1104 | if (ret) { | |
1105 | if (ret > 0) | |
1106 | ret = -ENOENT; | |
1107 | goto failed; | |
1108 | } | |
1109 | ||
5f39d397 CM |
1110 | leaf = path->nodes[0]; |
1111 | inode_item = btrfs_item_ptr(leaf, path->slots[0], | |
39279cc3 CM |
1112 | struct btrfs_inode_item); |
1113 | ||
5f39d397 CM |
1114 | fill_inode_item(leaf, inode_item, inode); |
1115 | btrfs_mark_buffer_dirty(leaf); | |
15ee9bc7 | 1116 | btrfs_set_inode_last_trans(trans, inode); |
39279cc3 CM |
1117 | ret = 0; |
1118 | failed: | |
39279cc3 CM |
1119 | btrfs_free_path(path); |
1120 | return ret; | |
1121 | } | |
1122 | ||
1123 | ||
1124 | static int btrfs_unlink_trans(struct btrfs_trans_handle *trans, | |
1125 | struct btrfs_root *root, | |
1126 | struct inode *dir, | |
1127 | struct dentry *dentry) | |
1128 | { | |
1129 | struct btrfs_path *path; | |
1130 | const char *name = dentry->d_name.name; | |
1131 | int name_len = dentry->d_name.len; | |
1132 | int ret = 0; | |
5f39d397 | 1133 | struct extent_buffer *leaf; |
39279cc3 | 1134 | struct btrfs_dir_item *di; |
5f39d397 | 1135 | struct btrfs_key key; |
aec7477b | 1136 | u64 index; |
39279cc3 CM |
1137 | |
1138 | path = btrfs_alloc_path(); | |
54aa1f4d CM |
1139 | if (!path) { |
1140 | ret = -ENOMEM; | |
1141 | goto err; | |
1142 | } | |
1143 | ||
39279cc3 CM |
1144 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, |
1145 | name, name_len, -1); | |
1146 | if (IS_ERR(di)) { | |
1147 | ret = PTR_ERR(di); | |
1148 | goto err; | |
1149 | } | |
1150 | if (!di) { | |
1151 | ret = -ENOENT; | |
1152 | goto err; | |
1153 | } | |
5f39d397 CM |
1154 | leaf = path->nodes[0]; |
1155 | btrfs_dir_item_key_to_cpu(leaf, di, &key); | |
39279cc3 | 1156 | ret = btrfs_delete_one_dir_name(trans, root, path, di); |
54aa1f4d CM |
1157 | if (ret) |
1158 | goto err; | |
39279cc3 CM |
1159 | btrfs_release_path(root, path); |
1160 | ||
aec7477b JB |
1161 | ret = btrfs_del_inode_ref(trans, root, name, name_len, |
1162 | dentry->d_inode->i_ino, | |
1163 | dentry->d_parent->d_inode->i_ino, &index); | |
1164 | if (ret) { | |
1165 | printk("failed to delete reference to %.*s, " | |
1166 | "inode %lu parent %lu\n", name_len, name, | |
1167 | dentry->d_inode->i_ino, | |
1168 | dentry->d_parent->d_inode->i_ino); | |
1169 | goto err; | |
1170 | } | |
1171 | ||
39279cc3 | 1172 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, |
aec7477b | 1173 | index, name, name_len, -1); |
39279cc3 CM |
1174 | if (IS_ERR(di)) { |
1175 | ret = PTR_ERR(di); | |
1176 | goto err; | |
1177 | } | |
1178 | if (!di) { | |
1179 | ret = -ENOENT; | |
1180 | goto err; | |
1181 | } | |
1182 | ret = btrfs_delete_one_dir_name(trans, root, path, di); | |
925baedd | 1183 | btrfs_release_path(root, path); |
39279cc3 CM |
1184 | |
1185 | dentry->d_inode->i_ctime = dir->i_ctime; | |
1186 | err: | |
1187 | btrfs_free_path(path); | |
1188 | if (!ret) { | |
dbe674a9 | 1189 | btrfs_i_size_write(dir, dir->i_size - name_len * 2); |
79c44584 | 1190 | dir->i_mtime = dir->i_ctime = CURRENT_TIME; |
39279cc3 | 1191 | btrfs_update_inode(trans, root, dir); |
6da6abae CM |
1192 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
1193 | dentry->d_inode->i_nlink--; | |
1194 | #else | |
39279cc3 | 1195 | drop_nlink(dentry->d_inode); |
6da6abae | 1196 | #endif |
54aa1f4d | 1197 | ret = btrfs_update_inode(trans, root, dentry->d_inode); |
39279cc3 CM |
1198 | dir->i_sb->s_dirt = 1; |
1199 | } | |
1200 | return ret; | |
1201 | } | |
1202 | ||
1203 | static int btrfs_unlink(struct inode *dir, struct dentry *dentry) | |
1204 | { | |
1205 | struct btrfs_root *root; | |
1206 | struct btrfs_trans_handle *trans; | |
7b128766 | 1207 | struct inode *inode = dentry->d_inode; |
39279cc3 | 1208 | int ret; |
1832a6d5 | 1209 | unsigned long nr = 0; |
39279cc3 CM |
1210 | |
1211 | root = BTRFS_I(dir)->root; | |
1832a6d5 CM |
1212 | |
1213 | ret = btrfs_check_free_space(root, 1, 1); | |
1214 | if (ret) | |
1215 | goto fail; | |
1216 | ||
39279cc3 | 1217 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1218 | |
39279cc3 CM |
1219 | btrfs_set_trans_block_group(trans, dir); |
1220 | ret = btrfs_unlink_trans(trans, root, dir, dentry); | |
7b128766 JB |
1221 | |
1222 | if (inode->i_nlink == 0) | |
1223 | ret = btrfs_orphan_add(trans, inode); | |
1224 | ||
d3c2fdcf | 1225 | nr = trans->blocks_used; |
5f39d397 | 1226 | |
89ce8a63 | 1227 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 1228 | fail: |
d3c2fdcf | 1229 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1230 | return ret; |
1231 | } | |
1232 | ||
1233 | static int btrfs_rmdir(struct inode *dir, struct dentry *dentry) | |
1234 | { | |
1235 | struct inode *inode = dentry->d_inode; | |
1832a6d5 | 1236 | int err = 0; |
39279cc3 CM |
1237 | int ret; |
1238 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
39279cc3 | 1239 | struct btrfs_trans_handle *trans; |
1832a6d5 | 1240 | unsigned long nr = 0; |
39279cc3 | 1241 | |
925baedd | 1242 | if (inode->i_size > BTRFS_EMPTY_DIR_SIZE) { |
134d4512 | 1243 | return -ENOTEMPTY; |
925baedd | 1244 | } |
134d4512 | 1245 | |
1832a6d5 CM |
1246 | ret = btrfs_check_free_space(root, 1, 1); |
1247 | if (ret) | |
1248 | goto fail; | |
1249 | ||
39279cc3 CM |
1250 | trans = btrfs_start_transaction(root, 1); |
1251 | btrfs_set_trans_block_group(trans, dir); | |
39279cc3 | 1252 | |
7b128766 JB |
1253 | err = btrfs_orphan_add(trans, inode); |
1254 | if (err) | |
1255 | goto fail_trans; | |
1256 | ||
39279cc3 CM |
1257 | /* now the directory is empty */ |
1258 | err = btrfs_unlink_trans(trans, root, dir, dentry); | |
1259 | if (!err) { | |
dbe674a9 | 1260 | btrfs_i_size_write(inode, 0); |
39279cc3 | 1261 | } |
3954401f | 1262 | |
7b128766 | 1263 | fail_trans: |
d3c2fdcf | 1264 | nr = trans->blocks_used; |
89ce8a63 | 1265 | ret = btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 1266 | fail: |
d3c2fdcf | 1267 | btrfs_btree_balance_dirty(root, nr); |
3954401f | 1268 | |
39279cc3 CM |
1269 | if (ret && !err) |
1270 | err = ret; | |
1271 | return err; | |
1272 | } | |
1273 | ||
39279cc3 CM |
1274 | /* |
1275 | * this can truncate away extent items, csum items and directory items. | |
1276 | * It starts at a high offset and removes keys until it can't find | |
1277 | * any higher than i_size. | |
1278 | * | |
1279 | * csum items that cross the new i_size are truncated to the new size | |
1280 | * as well. | |
7b128766 JB |
1281 | * |
1282 | * min_type is the minimum key type to truncate down to. If set to 0, this | |
1283 | * will kill all the items on this inode, including the INODE_ITEM_KEY. | |
39279cc3 CM |
1284 | */ |
1285 | static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans, | |
1286 | struct btrfs_root *root, | |
85e21bac CM |
1287 | struct inode *inode, |
1288 | u32 min_type) | |
39279cc3 CM |
1289 | { |
1290 | int ret; | |
1291 | struct btrfs_path *path; | |
1292 | struct btrfs_key key; | |
5f39d397 | 1293 | struct btrfs_key found_key; |
39279cc3 | 1294 | u32 found_type; |
5f39d397 | 1295 | struct extent_buffer *leaf; |
39279cc3 CM |
1296 | struct btrfs_file_extent_item *fi; |
1297 | u64 extent_start = 0; | |
db94535d | 1298 | u64 extent_num_bytes = 0; |
39279cc3 | 1299 | u64 item_end = 0; |
7bb86316 | 1300 | u64 root_gen = 0; |
d8d5f3e1 | 1301 | u64 root_owner = 0; |
39279cc3 CM |
1302 | int found_extent; |
1303 | int del_item; | |
85e21bac CM |
1304 | int pending_del_nr = 0; |
1305 | int pending_del_slot = 0; | |
179e29e4 | 1306 | int extent_type = -1; |
3b951516 | 1307 | u64 mask = root->sectorsize - 1; |
39279cc3 | 1308 | |
3b951516 | 1309 | btrfs_drop_extent_cache(inode, inode->i_size & (~mask), (u64)-1); |
39279cc3 | 1310 | path = btrfs_alloc_path(); |
3c69faec | 1311 | path->reada = -1; |
39279cc3 | 1312 | BUG_ON(!path); |
5f39d397 | 1313 | |
39279cc3 CM |
1314 | /* FIXME, add redo link to tree so we don't leak on crash */ |
1315 | key.objectid = inode->i_ino; | |
1316 | key.offset = (u64)-1; | |
5f39d397 CM |
1317 | key.type = (u8)-1; |
1318 | ||
85e21bac CM |
1319 | btrfs_init_path(path); |
1320 | search_again: | |
1321 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); | |
1322 | if (ret < 0) { | |
1323 | goto error; | |
1324 | } | |
1325 | if (ret > 0) { | |
1326 | BUG_ON(path->slots[0] == 0); | |
1327 | path->slots[0]--; | |
1328 | } | |
1329 | ||
39279cc3 | 1330 | while(1) { |
39279cc3 | 1331 | fi = NULL; |
5f39d397 CM |
1332 | leaf = path->nodes[0]; |
1333 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
1334 | found_type = btrfs_key_type(&found_key); | |
39279cc3 | 1335 | |
5f39d397 | 1336 | if (found_key.objectid != inode->i_ino) |
39279cc3 | 1337 | break; |
5f39d397 | 1338 | |
85e21bac | 1339 | if (found_type < min_type) |
39279cc3 CM |
1340 | break; |
1341 | ||
5f39d397 | 1342 | item_end = found_key.offset; |
39279cc3 | 1343 | if (found_type == BTRFS_EXTENT_DATA_KEY) { |
5f39d397 | 1344 | fi = btrfs_item_ptr(leaf, path->slots[0], |
39279cc3 | 1345 | struct btrfs_file_extent_item); |
179e29e4 CM |
1346 | extent_type = btrfs_file_extent_type(leaf, fi); |
1347 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
5f39d397 | 1348 | item_end += |
db94535d | 1349 | btrfs_file_extent_num_bytes(leaf, fi); |
179e29e4 CM |
1350 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1351 | struct btrfs_item *item = btrfs_item_nr(leaf, | |
1352 | path->slots[0]); | |
1353 | item_end += btrfs_file_extent_inline_len(leaf, | |
1354 | item); | |
39279cc3 | 1355 | } |
008630c1 | 1356 | item_end--; |
39279cc3 CM |
1357 | } |
1358 | if (found_type == BTRFS_CSUM_ITEM_KEY) { | |
1359 | ret = btrfs_csum_truncate(trans, root, path, | |
1360 | inode->i_size); | |
1361 | BUG_ON(ret); | |
1362 | } | |
008630c1 | 1363 | if (item_end < inode->i_size) { |
b888db2b CM |
1364 | if (found_type == BTRFS_DIR_ITEM_KEY) { |
1365 | found_type = BTRFS_INODE_ITEM_KEY; | |
1366 | } else if (found_type == BTRFS_EXTENT_ITEM_KEY) { | |
1367 | found_type = BTRFS_CSUM_ITEM_KEY; | |
85e21bac CM |
1368 | } else if (found_type == BTRFS_EXTENT_DATA_KEY) { |
1369 | found_type = BTRFS_XATTR_ITEM_KEY; | |
1370 | } else if (found_type == BTRFS_XATTR_ITEM_KEY) { | |
1371 | found_type = BTRFS_INODE_REF_KEY; | |
b888db2b CM |
1372 | } else if (found_type) { |
1373 | found_type--; | |
1374 | } else { | |
1375 | break; | |
39279cc3 | 1376 | } |
a61721d5 | 1377 | btrfs_set_key_type(&key, found_type); |
85e21bac | 1378 | goto next; |
39279cc3 | 1379 | } |
5f39d397 | 1380 | if (found_key.offset >= inode->i_size) |
39279cc3 CM |
1381 | del_item = 1; |
1382 | else | |
1383 | del_item = 0; | |
1384 | found_extent = 0; | |
1385 | ||
1386 | /* FIXME, shrink the extent if the ref count is only 1 */ | |
179e29e4 CM |
1387 | if (found_type != BTRFS_EXTENT_DATA_KEY) |
1388 | goto delete; | |
1389 | ||
1390 | if (extent_type != BTRFS_FILE_EXTENT_INLINE) { | |
39279cc3 | 1391 | u64 num_dec; |
db94535d | 1392 | extent_start = btrfs_file_extent_disk_bytenr(leaf, fi); |
39279cc3 | 1393 | if (!del_item) { |
db94535d CM |
1394 | u64 orig_num_bytes = |
1395 | btrfs_file_extent_num_bytes(leaf, fi); | |
1396 | extent_num_bytes = inode->i_size - | |
5f39d397 | 1397 | found_key.offset + root->sectorsize - 1; |
b1632b10 Y |
1398 | extent_num_bytes = extent_num_bytes & |
1399 | ~((u64)root->sectorsize - 1); | |
db94535d CM |
1400 | btrfs_set_file_extent_num_bytes(leaf, fi, |
1401 | extent_num_bytes); | |
1402 | num_dec = (orig_num_bytes - | |
9069218d CM |
1403 | extent_num_bytes); |
1404 | if (extent_start != 0) | |
1405 | dec_i_blocks(inode, num_dec); | |
5f39d397 | 1406 | btrfs_mark_buffer_dirty(leaf); |
39279cc3 | 1407 | } else { |
db94535d CM |
1408 | extent_num_bytes = |
1409 | btrfs_file_extent_disk_num_bytes(leaf, | |
1410 | fi); | |
39279cc3 | 1411 | /* FIXME blocksize != 4096 */ |
9069218d | 1412 | num_dec = btrfs_file_extent_num_bytes(leaf, fi); |
39279cc3 CM |
1413 | if (extent_start != 0) { |
1414 | found_extent = 1; | |
9069218d | 1415 | dec_i_blocks(inode, num_dec); |
39279cc3 | 1416 | } |
d8d5f3e1 CM |
1417 | root_gen = btrfs_header_generation(leaf); |
1418 | root_owner = btrfs_header_owner(leaf); | |
39279cc3 | 1419 | } |
9069218d CM |
1420 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { |
1421 | if (!del_item) { | |
1422 | u32 newsize = inode->i_size - found_key.offset; | |
1423 | dec_i_blocks(inode, item_end + 1 - | |
1424 | found_key.offset - newsize); | |
1425 | newsize = | |
1426 | btrfs_file_extent_calc_inline_size(newsize); | |
1427 | ret = btrfs_truncate_item(trans, root, path, | |
1428 | newsize, 1); | |
1429 | BUG_ON(ret); | |
1430 | } else { | |
1431 | dec_i_blocks(inode, item_end + 1 - | |
1432 | found_key.offset); | |
1433 | } | |
39279cc3 | 1434 | } |
179e29e4 | 1435 | delete: |
39279cc3 | 1436 | if (del_item) { |
85e21bac CM |
1437 | if (!pending_del_nr) { |
1438 | /* no pending yet, add ourselves */ | |
1439 | pending_del_slot = path->slots[0]; | |
1440 | pending_del_nr = 1; | |
1441 | } else if (pending_del_nr && | |
1442 | path->slots[0] + 1 == pending_del_slot) { | |
1443 | /* hop on the pending chunk */ | |
1444 | pending_del_nr++; | |
1445 | pending_del_slot = path->slots[0]; | |
1446 | } else { | |
1447 | printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path->slots[0], pending_del_nr, pending_del_slot); | |
1448 | } | |
39279cc3 CM |
1449 | } else { |
1450 | break; | |
1451 | } | |
39279cc3 CM |
1452 | if (found_extent) { |
1453 | ret = btrfs_free_extent(trans, root, extent_start, | |
7bb86316 | 1454 | extent_num_bytes, |
d8d5f3e1 | 1455 | root_owner, |
7bb86316 CM |
1456 | root_gen, inode->i_ino, |
1457 | found_key.offset, 0); | |
39279cc3 CM |
1458 | BUG_ON(ret); |
1459 | } | |
85e21bac CM |
1460 | next: |
1461 | if (path->slots[0] == 0) { | |
1462 | if (pending_del_nr) | |
1463 | goto del_pending; | |
1464 | btrfs_release_path(root, path); | |
1465 | goto search_again; | |
1466 | } | |
1467 | ||
1468 | path->slots[0]--; | |
1469 | if (pending_del_nr && | |
1470 | path->slots[0] + 1 != pending_del_slot) { | |
1471 | struct btrfs_key debug; | |
1472 | del_pending: | |
1473 | btrfs_item_key_to_cpu(path->nodes[0], &debug, | |
1474 | pending_del_slot); | |
1475 | ret = btrfs_del_items(trans, root, path, | |
1476 | pending_del_slot, | |
1477 | pending_del_nr); | |
1478 | BUG_ON(ret); | |
1479 | pending_del_nr = 0; | |
1480 | btrfs_release_path(root, path); | |
1481 | goto search_again; | |
1482 | } | |
39279cc3 CM |
1483 | } |
1484 | ret = 0; | |
1485 | error: | |
85e21bac CM |
1486 | if (pending_del_nr) { |
1487 | ret = btrfs_del_items(trans, root, path, pending_del_slot, | |
1488 | pending_del_nr); | |
1489 | } | |
39279cc3 CM |
1490 | btrfs_free_path(path); |
1491 | inode->i_sb->s_dirt = 1; | |
1492 | return ret; | |
1493 | } | |
1494 | ||
1495 | /* | |
1496 | * taken from block_truncate_page, but does cow as it zeros out | |
1497 | * any bytes left in the last page in the file. | |
1498 | */ | |
1499 | static int btrfs_truncate_page(struct address_space *mapping, loff_t from) | |
1500 | { | |
1501 | struct inode *inode = mapping->host; | |
db94535d | 1502 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
1503 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
1504 | struct btrfs_ordered_extent *ordered; | |
1505 | char *kaddr; | |
db94535d | 1506 | u32 blocksize = root->sectorsize; |
39279cc3 CM |
1507 | pgoff_t index = from >> PAGE_CACHE_SHIFT; |
1508 | unsigned offset = from & (PAGE_CACHE_SIZE-1); | |
1509 | struct page *page; | |
39279cc3 | 1510 | int ret = 0; |
a52d9a80 | 1511 | u64 page_start; |
e6dcd2dc | 1512 | u64 page_end; |
39279cc3 CM |
1513 | |
1514 | if ((offset & (blocksize - 1)) == 0) | |
1515 | goto out; | |
1516 | ||
1517 | ret = -ENOMEM; | |
211c17f5 | 1518 | again: |
39279cc3 CM |
1519 | page = grab_cache_page(mapping, index); |
1520 | if (!page) | |
1521 | goto out; | |
e6dcd2dc CM |
1522 | |
1523 | page_start = page_offset(page); | |
1524 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
1525 | ||
39279cc3 | 1526 | if (!PageUptodate(page)) { |
9ebefb18 | 1527 | ret = btrfs_readpage(NULL, page); |
39279cc3 | 1528 | lock_page(page); |
211c17f5 CM |
1529 | if (page->mapping != mapping) { |
1530 | unlock_page(page); | |
1531 | page_cache_release(page); | |
1532 | goto again; | |
1533 | } | |
39279cc3 CM |
1534 | if (!PageUptodate(page)) { |
1535 | ret = -EIO; | |
89642229 | 1536 | goto out_unlock; |
39279cc3 CM |
1537 | } |
1538 | } | |
211c17f5 | 1539 | wait_on_page_writeback(page); |
e6dcd2dc CM |
1540 | |
1541 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
1542 | set_page_extent_mapped(page); | |
1543 | ||
1544 | ordered = btrfs_lookup_ordered_extent(inode, page_start); | |
1545 | if (ordered) { | |
1546 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
1547 | unlock_page(page); | |
1548 | page_cache_release(page); | |
eb84ae03 | 1549 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
1550 | btrfs_put_ordered_extent(ordered); |
1551 | goto again; | |
1552 | } | |
1553 | ||
ea8c2819 | 1554 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
e6dcd2dc CM |
1555 | ret = 0; |
1556 | if (offset != PAGE_CACHE_SIZE) { | |
1557 | kaddr = kmap(page); | |
1558 | memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset); | |
1559 | flush_dcache_page(page); | |
1560 | kunmap(page); | |
1561 | } | |
247e743c | 1562 | ClearPageChecked(page); |
e6dcd2dc CM |
1563 | set_page_dirty(page); |
1564 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
39279cc3 | 1565 | |
89642229 | 1566 | out_unlock: |
39279cc3 CM |
1567 | unlock_page(page); |
1568 | page_cache_release(page); | |
1569 | out: | |
1570 | return ret; | |
1571 | } | |
1572 | ||
1573 | static int btrfs_setattr(struct dentry *dentry, struct iattr *attr) | |
1574 | { | |
1575 | struct inode *inode = dentry->d_inode; | |
1576 | int err; | |
1577 | ||
1578 | err = inode_change_ok(inode, attr); | |
1579 | if (err) | |
1580 | return err; | |
1581 | ||
1582 | if (S_ISREG(inode->i_mode) && | |
1583 | attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) { | |
1584 | struct btrfs_trans_handle *trans; | |
1585 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d1310b2e | 1586 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2bf5a725 | 1587 | |
5f39d397 | 1588 | u64 mask = root->sectorsize - 1; |
1b0f7c29 | 1589 | u64 hole_start = (inode->i_size + mask) & ~mask; |
f392a938 | 1590 | u64 block_end = (attr->ia_size + mask) & ~mask; |
39279cc3 | 1591 | u64 hole_size; |
179e29e4 | 1592 | u64 alloc_hint = 0; |
39279cc3 | 1593 | |
1b0f7c29 | 1594 | if (attr->ia_size <= hole_start) |
39279cc3 CM |
1595 | goto out; |
1596 | ||
1832a6d5 | 1597 | err = btrfs_check_free_space(root, 1, 0); |
1832a6d5 CM |
1598 | if (err) |
1599 | goto fail; | |
1600 | ||
39279cc3 CM |
1601 | btrfs_truncate_page(inode->i_mapping, inode->i_size); |
1602 | ||
5f56406a | 1603 | hole_size = block_end - hole_start; |
7c2fe32a CM |
1604 | while(1) { |
1605 | struct btrfs_ordered_extent *ordered; | |
1606 | btrfs_wait_ordered_range(inode, hole_start, hole_size); | |
1607 | ||
1608 | lock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); | |
1609 | ordered = btrfs_lookup_ordered_extent(inode, hole_start); | |
1610 | if (ordered) { | |
1611 | unlock_extent(io_tree, hole_start, | |
1612 | block_end - 1, GFP_NOFS); | |
1613 | btrfs_put_ordered_extent(ordered); | |
1614 | } else { | |
1615 | break; | |
1616 | } | |
1617 | } | |
39279cc3 | 1618 | |
39279cc3 CM |
1619 | trans = btrfs_start_transaction(root, 1); |
1620 | btrfs_set_trans_block_group(trans, inode); | |
ee6e6504 | 1621 | mutex_lock(&BTRFS_I(inode)->extent_mutex); |
2bf5a725 | 1622 | err = btrfs_drop_extents(trans, root, inode, |
1b0f7c29 | 1623 | hole_start, block_end, hole_start, |
3326d1b0 | 1624 | &alloc_hint); |
2bf5a725 | 1625 | |
179e29e4 CM |
1626 | if (alloc_hint != EXTENT_MAP_INLINE) { |
1627 | err = btrfs_insert_file_extent(trans, root, | |
1628 | inode->i_ino, | |
5f56406a | 1629 | hole_start, 0, 0, |
f2eb0a24 | 1630 | hole_size, 0); |
d1310b2e | 1631 | btrfs_drop_extent_cache(inode, hole_start, |
3b951516 | 1632 | (u64)-1); |
5f56406a | 1633 | btrfs_check_file(root, inode); |
179e29e4 | 1634 | } |
ee6e6504 | 1635 | mutex_unlock(&BTRFS_I(inode)->extent_mutex); |
39279cc3 | 1636 | btrfs_end_transaction(trans, root); |
1b0f7c29 | 1637 | unlock_extent(io_tree, hole_start, block_end - 1, GFP_NOFS); |
54aa1f4d CM |
1638 | if (err) |
1639 | return err; | |
39279cc3 CM |
1640 | } |
1641 | out: | |
1642 | err = inode_setattr(inode, attr); | |
33268eaf JB |
1643 | |
1644 | if (!err && ((attr->ia_valid & ATTR_MODE))) | |
1645 | err = btrfs_acl_chmod(inode); | |
1832a6d5 | 1646 | fail: |
39279cc3 CM |
1647 | return err; |
1648 | } | |
61295eb8 | 1649 | |
39279cc3 CM |
1650 | void btrfs_delete_inode(struct inode *inode) |
1651 | { | |
1652 | struct btrfs_trans_handle *trans; | |
1653 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
d3c2fdcf | 1654 | unsigned long nr; |
39279cc3 CM |
1655 | int ret; |
1656 | ||
1657 | truncate_inode_pages(&inode->i_data, 0); | |
1658 | if (is_bad_inode(inode)) { | |
7b128766 | 1659 | btrfs_orphan_del(NULL, inode); |
39279cc3 CM |
1660 | goto no_delete; |
1661 | } | |
4a096752 | 1662 | btrfs_wait_ordered_range(inode, 0, (u64)-1); |
5f39d397 | 1663 | |
dbe674a9 | 1664 | btrfs_i_size_write(inode, 0); |
39279cc3 | 1665 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 1666 | |
39279cc3 | 1667 | btrfs_set_trans_block_group(trans, inode); |
85e21bac | 1668 | ret = btrfs_truncate_in_trans(trans, root, inode, 0); |
7b128766 JB |
1669 | if (ret) { |
1670 | btrfs_orphan_del(NULL, inode); | |
54aa1f4d | 1671 | goto no_delete_lock; |
7b128766 JB |
1672 | } |
1673 | ||
1674 | btrfs_orphan_del(trans, inode); | |
85e21bac | 1675 | |
d3c2fdcf | 1676 | nr = trans->blocks_used; |
85e21bac | 1677 | clear_inode(inode); |
5f39d397 | 1678 | |
39279cc3 | 1679 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1680 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 | 1681 | return; |
54aa1f4d CM |
1682 | |
1683 | no_delete_lock: | |
d3c2fdcf | 1684 | nr = trans->blocks_used; |
54aa1f4d | 1685 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 1686 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
1687 | no_delete: |
1688 | clear_inode(inode); | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * this returns the key found in the dir entry in the location pointer. | |
1693 | * If no dir entries were found, location->objectid is 0. | |
1694 | */ | |
1695 | static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry, | |
1696 | struct btrfs_key *location) | |
1697 | { | |
1698 | const char *name = dentry->d_name.name; | |
1699 | int namelen = dentry->d_name.len; | |
1700 | struct btrfs_dir_item *di; | |
1701 | struct btrfs_path *path; | |
1702 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
0d9f7f3e | 1703 | int ret = 0; |
39279cc3 | 1704 | |
3954401f CM |
1705 | if (namelen == 1 && strcmp(name, ".") == 0) { |
1706 | location->objectid = dir->i_ino; | |
1707 | location->type = BTRFS_INODE_ITEM_KEY; | |
1708 | location->offset = 0; | |
1709 | return 0; | |
1710 | } | |
39279cc3 CM |
1711 | path = btrfs_alloc_path(); |
1712 | BUG_ON(!path); | |
3954401f | 1713 | |
7a720536 | 1714 | if (namelen == 2 && strcmp(name, "..") == 0) { |
3954401f CM |
1715 | struct btrfs_key key; |
1716 | struct extent_buffer *leaf; | |
3954401f CM |
1717 | int slot; |
1718 | ||
1719 | key.objectid = dir->i_ino; | |
445dceb7 | 1720 | key.offset = (u64)-1; |
3954401f | 1721 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); |
445dceb7 Y |
1722 | if (ret < 0 || path->slots[0] == 0) |
1723 | goto out_err; | |
3954401f CM |
1724 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1725 | BUG_ON(ret == 0); | |
1726 | ret = 0; | |
3954401f | 1727 | leaf = path->nodes[0]; |
445dceb7 | 1728 | slot = path->slots[0] - 1; |
3954401f CM |
1729 | |
1730 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
1731 | if (key.objectid != dir->i_ino || | |
1732 | key.type != BTRFS_INODE_REF_KEY) { | |
1733 | goto out_err; | |
1734 | } | |
1735 | location->objectid = key.offset; | |
1736 | location->type = BTRFS_INODE_ITEM_KEY; | |
1737 | location->offset = 0; | |
1738 | goto out; | |
1739 | } | |
1740 | ||
39279cc3 CM |
1741 | di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name, |
1742 | namelen, 0); | |
0d9f7f3e Y |
1743 | if (IS_ERR(di)) |
1744 | ret = PTR_ERR(di); | |
39279cc3 | 1745 | if (!di || IS_ERR(di)) { |
3954401f | 1746 | goto out_err; |
39279cc3 | 1747 | } |
5f39d397 | 1748 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, location); |
39279cc3 | 1749 | out: |
39279cc3 CM |
1750 | btrfs_free_path(path); |
1751 | return ret; | |
3954401f CM |
1752 | out_err: |
1753 | location->objectid = 0; | |
1754 | goto out; | |
39279cc3 CM |
1755 | } |
1756 | ||
1757 | /* | |
1758 | * when we hit a tree root in a directory, the btrfs part of the inode | |
1759 | * needs to be changed to reflect the root directory of the tree root. This | |
1760 | * is kind of like crossing a mount point. | |
1761 | */ | |
1762 | static int fixup_tree_root_location(struct btrfs_root *root, | |
1763 | struct btrfs_key *location, | |
58176a96 JB |
1764 | struct btrfs_root **sub_root, |
1765 | struct dentry *dentry) | |
39279cc3 | 1766 | { |
39279cc3 CM |
1767 | struct btrfs_root_item *ri; |
1768 | ||
1769 | if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY) | |
1770 | return 0; | |
1771 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1772 | return 0; | |
1773 | ||
58176a96 JB |
1774 | *sub_root = btrfs_read_fs_root(root->fs_info, location, |
1775 | dentry->d_name.name, | |
1776 | dentry->d_name.len); | |
39279cc3 CM |
1777 | if (IS_ERR(*sub_root)) |
1778 | return PTR_ERR(*sub_root); | |
1779 | ||
1780 | ri = &(*sub_root)->root_item; | |
1781 | location->objectid = btrfs_root_dirid(ri); | |
39279cc3 CM |
1782 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); |
1783 | location->offset = 0; | |
1784 | ||
39279cc3 CM |
1785 | return 0; |
1786 | } | |
1787 | ||
1788 | static int btrfs_init_locked_inode(struct inode *inode, void *p) | |
1789 | { | |
1790 | struct btrfs_iget_args *args = p; | |
1791 | inode->i_ino = args->ino; | |
1792 | BTRFS_I(inode)->root = args->root; | |
9069218d | 1793 | BTRFS_I(inode)->delalloc_bytes = 0; |
db69e0eb | 1794 | inode->i_mapping->writeback_index = 0; |
dbe674a9 | 1795 | BTRFS_I(inode)->disk_i_size = 0; |
aec7477b | 1796 | BTRFS_I(inode)->index_cnt = (u64)-1; |
d1310b2e CM |
1797 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
1798 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 1799 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
1800 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
1801 | inode->i_mapping, GFP_NOFS); | |
ea8c2819 | 1802 | INIT_LIST_HEAD(&BTRFS_I(inode)->delalloc_inodes); |
ba1da2f4 | 1803 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
1b1e2135 | 1804 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 1805 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
39279cc3 CM |
1806 | return 0; |
1807 | } | |
1808 | ||
1809 | static int btrfs_find_actor(struct inode *inode, void *opaque) | |
1810 | { | |
1811 | struct btrfs_iget_args *args = opaque; | |
1812 | return (args->ino == inode->i_ino && | |
1813 | args->root == BTRFS_I(inode)->root); | |
1814 | } | |
1815 | ||
dc17ff8f CM |
1816 | struct inode *btrfs_ilookup(struct super_block *s, u64 objectid, |
1817 | u64 root_objectid) | |
1818 | { | |
1819 | struct btrfs_iget_args args; | |
1820 | args.ino = objectid; | |
1821 | args.root = btrfs_lookup_fs_root(btrfs_sb(s)->fs_info, root_objectid); | |
1822 | ||
1823 | if (!args.root) | |
1824 | return NULL; | |
1825 | ||
1826 | return ilookup5(s, objectid, btrfs_find_actor, (void *)&args); | |
1827 | } | |
1828 | ||
39279cc3 CM |
1829 | struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid, |
1830 | struct btrfs_root *root) | |
1831 | { | |
1832 | struct inode *inode; | |
1833 | struct btrfs_iget_args args; | |
1834 | args.ino = objectid; | |
1835 | args.root = root; | |
1836 | ||
1837 | inode = iget5_locked(s, objectid, btrfs_find_actor, | |
1838 | btrfs_init_locked_inode, | |
1839 | (void *)&args); | |
1840 | return inode; | |
1841 | } | |
1842 | ||
1a54ef8c BR |
1843 | /* Get an inode object given its location and corresponding root. |
1844 | * Returns in *is_new if the inode was read from disk | |
1845 | */ | |
1846 | struct inode *btrfs_iget(struct super_block *s, struct btrfs_key *location, | |
1847 | struct btrfs_root *root, int *is_new) | |
1848 | { | |
1849 | struct inode *inode; | |
1850 | ||
1851 | inode = btrfs_iget_locked(s, location->objectid, root); | |
1852 | if (!inode) | |
1853 | return ERR_PTR(-EACCES); | |
1854 | ||
1855 | if (inode->i_state & I_NEW) { | |
1856 | BTRFS_I(inode)->root = root; | |
1857 | memcpy(&BTRFS_I(inode)->location, location, sizeof(*location)); | |
1858 | btrfs_read_locked_inode(inode); | |
1859 | unlock_new_inode(inode); | |
1860 | if (is_new) | |
1861 | *is_new = 1; | |
1862 | } else { | |
1863 | if (is_new) | |
1864 | *is_new = 0; | |
1865 | } | |
1866 | ||
1867 | return inode; | |
1868 | } | |
1869 | ||
39279cc3 CM |
1870 | static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry, |
1871 | struct nameidata *nd) | |
1872 | { | |
1873 | struct inode * inode; | |
1874 | struct btrfs_inode *bi = BTRFS_I(dir); | |
1875 | struct btrfs_root *root = bi->root; | |
1876 | struct btrfs_root *sub_root = root; | |
1877 | struct btrfs_key location; | |
1a54ef8c | 1878 | int ret, new, do_orphan = 0; |
39279cc3 CM |
1879 | |
1880 | if (dentry->d_name.len > BTRFS_NAME_LEN) | |
1881 | return ERR_PTR(-ENAMETOOLONG); | |
5f39d397 | 1882 | |
39279cc3 | 1883 | ret = btrfs_inode_by_name(dir, dentry, &location); |
5f39d397 | 1884 | |
39279cc3 CM |
1885 | if (ret < 0) |
1886 | return ERR_PTR(ret); | |
5f39d397 | 1887 | |
39279cc3 CM |
1888 | inode = NULL; |
1889 | if (location.objectid) { | |
58176a96 JB |
1890 | ret = fixup_tree_root_location(root, &location, &sub_root, |
1891 | dentry); | |
39279cc3 CM |
1892 | if (ret < 0) |
1893 | return ERR_PTR(ret); | |
1894 | if (ret > 0) | |
1895 | return ERR_PTR(-ENOENT); | |
1a54ef8c BR |
1896 | inode = btrfs_iget(dir->i_sb, &location, sub_root, &new); |
1897 | if (IS_ERR(inode)) | |
1898 | return ERR_CAST(inode); | |
1899 | ||
1900 | /* the inode and parent dir are two different roots */ | |
1901 | if (new && root != sub_root) { | |
1902 | igrab(inode); | |
1903 | sub_root->inode = inode; | |
1904 | do_orphan = 1; | |
39279cc3 CM |
1905 | } |
1906 | } | |
7b128766 JB |
1907 | |
1908 | if (unlikely(do_orphan)) | |
1909 | btrfs_orphan_cleanup(sub_root); | |
1910 | ||
39279cc3 CM |
1911 | return d_splice_alias(inode, dentry); |
1912 | } | |
1913 | ||
39279cc3 CM |
1914 | static unsigned char btrfs_filetype_table[] = { |
1915 | DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK | |
1916 | }; | |
1917 | ||
1918 | static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir) | |
1919 | { | |
6da6abae | 1920 | struct inode *inode = filp->f_dentry->d_inode; |
39279cc3 CM |
1921 | struct btrfs_root *root = BTRFS_I(inode)->root; |
1922 | struct btrfs_item *item; | |
1923 | struct btrfs_dir_item *di; | |
1924 | struct btrfs_key key; | |
5f39d397 | 1925 | struct btrfs_key found_key; |
39279cc3 CM |
1926 | struct btrfs_path *path; |
1927 | int ret; | |
1928 | u32 nritems; | |
5f39d397 | 1929 | struct extent_buffer *leaf; |
39279cc3 CM |
1930 | int slot; |
1931 | int advance; | |
1932 | unsigned char d_type; | |
1933 | int over = 0; | |
1934 | u32 di_cur; | |
1935 | u32 di_total; | |
1936 | u32 di_len; | |
1937 | int key_type = BTRFS_DIR_INDEX_KEY; | |
5f39d397 CM |
1938 | char tmp_name[32]; |
1939 | char *name_ptr; | |
1940 | int name_len; | |
39279cc3 CM |
1941 | |
1942 | /* FIXME, use a real flag for deciding about the key type */ | |
1943 | if (root->fs_info->tree_root == root) | |
1944 | key_type = BTRFS_DIR_ITEM_KEY; | |
5f39d397 | 1945 | |
3954401f CM |
1946 | /* special case for "." */ |
1947 | if (filp->f_pos == 0) { | |
1948 | over = filldir(dirent, ".", 1, | |
1949 | 1, inode->i_ino, | |
1950 | DT_DIR); | |
1951 | if (over) | |
1952 | return 0; | |
1953 | filp->f_pos = 1; | |
1954 | } | |
1955 | ||
39279cc3 | 1956 | key.objectid = inode->i_ino; |
3954401f CM |
1957 | path = btrfs_alloc_path(); |
1958 | path->reada = 2; | |
1959 | ||
1960 | /* special case for .., just use the back ref */ | |
1961 | if (filp->f_pos == 1) { | |
1962 | btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY); | |
445dceb7 | 1963 | key.offset = (u64)-1; |
3954401f | 1964 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
445dceb7 | 1965 | if (ret < 0 || path->slots[0] == 0) { |
3954401f CM |
1966 | btrfs_release_path(root, path); |
1967 | goto read_dir_items; | |
1968 | } | |
445dceb7 Y |
1969 | BUG_ON(ret == 0); |
1970 | leaf = path->nodes[0]; | |
1971 | slot = path->slots[0] - 1; | |
3954401f CM |
1972 | btrfs_item_key_to_cpu(leaf, &found_key, slot); |
1973 | btrfs_release_path(root, path); | |
1974 | if (found_key.objectid != key.objectid || | |
1975 | found_key.type != BTRFS_INODE_REF_KEY) | |
1976 | goto read_dir_items; | |
1977 | over = filldir(dirent, "..", 2, | |
1978 | 2, found_key.offset, DT_DIR); | |
1979 | if (over) | |
1980 | goto nopos; | |
1981 | filp->f_pos = 2; | |
1982 | } | |
1983 | ||
1984 | read_dir_items: | |
39279cc3 CM |
1985 | btrfs_set_key_type(&key, key_type); |
1986 | key.offset = filp->f_pos; | |
5f39d397 | 1987 | |
39279cc3 CM |
1988 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1989 | if (ret < 0) | |
1990 | goto err; | |
1991 | advance = 0; | |
39279cc3 | 1992 | while(1) { |
5f39d397 CM |
1993 | leaf = path->nodes[0]; |
1994 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
1995 | slot = path->slots[0]; |
1996 | if (advance || slot >= nritems) { | |
1997 | if (slot >= nritems -1) { | |
39279cc3 CM |
1998 | ret = btrfs_next_leaf(root, path); |
1999 | if (ret) | |
2000 | break; | |
5f39d397 CM |
2001 | leaf = path->nodes[0]; |
2002 | nritems = btrfs_header_nritems(leaf); | |
39279cc3 CM |
2003 | slot = path->slots[0]; |
2004 | } else { | |
2005 | slot++; | |
2006 | path->slots[0]++; | |
2007 | } | |
2008 | } | |
2009 | advance = 1; | |
5f39d397 CM |
2010 | item = btrfs_item_nr(leaf, slot); |
2011 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
2012 | ||
2013 | if (found_key.objectid != key.objectid) | |
39279cc3 | 2014 | break; |
5f39d397 | 2015 | if (btrfs_key_type(&found_key) != key_type) |
39279cc3 | 2016 | break; |
5f39d397 | 2017 | if (found_key.offset < filp->f_pos) |
39279cc3 | 2018 | continue; |
5f39d397 CM |
2019 | |
2020 | filp->f_pos = found_key.offset; | |
39279cc3 CM |
2021 | advance = 1; |
2022 | di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item); | |
2023 | di_cur = 0; | |
5f39d397 | 2024 | di_total = btrfs_item_size(leaf, item); |
39279cc3 | 2025 | while(di_cur < di_total) { |
5f39d397 CM |
2026 | struct btrfs_key location; |
2027 | ||
2028 | name_len = btrfs_dir_name_len(leaf, di); | |
2029 | if (name_len < 32) { | |
2030 | name_ptr = tmp_name; | |
2031 | } else { | |
2032 | name_ptr = kmalloc(name_len, GFP_NOFS); | |
2033 | BUG_ON(!name_ptr); | |
2034 | } | |
2035 | read_extent_buffer(leaf, name_ptr, | |
2036 | (unsigned long)(di + 1), name_len); | |
2037 | ||
2038 | d_type = btrfs_filetype_table[btrfs_dir_type(leaf, di)]; | |
2039 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
5f39d397 CM |
2040 | over = filldir(dirent, name_ptr, name_len, |
2041 | found_key.offset, | |
2042 | location.objectid, | |
39279cc3 | 2043 | d_type); |
5f39d397 CM |
2044 | |
2045 | if (name_ptr != tmp_name) | |
2046 | kfree(name_ptr); | |
2047 | ||
39279cc3 CM |
2048 | if (over) |
2049 | goto nopos; | |
5103e947 JB |
2050 | di_len = btrfs_dir_name_len(leaf, di) + |
2051 | btrfs_dir_data_len(leaf, di) +sizeof(*di); | |
39279cc3 CM |
2052 | di_cur += di_len; |
2053 | di = (struct btrfs_dir_item *)((char *)di + di_len); | |
2054 | } | |
2055 | } | |
5e591a07 YZ |
2056 | if (key_type == BTRFS_DIR_INDEX_KEY) |
2057 | filp->f_pos = INT_LIMIT(typeof(filp->f_pos)); | |
2058 | else | |
2059 | filp->f_pos++; | |
39279cc3 CM |
2060 | nopos: |
2061 | ret = 0; | |
2062 | err: | |
39279cc3 | 2063 | btrfs_free_path(path); |
39279cc3 CM |
2064 | return ret; |
2065 | } | |
2066 | ||
2067 | int btrfs_write_inode(struct inode *inode, int wait) | |
2068 | { | |
2069 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2070 | struct btrfs_trans_handle *trans; | |
2071 | int ret = 0; | |
2072 | ||
4ca8b41e CM |
2073 | if (root->fs_info->closing > 1) |
2074 | return 0; | |
2075 | ||
39279cc3 | 2076 | if (wait) { |
f9295749 | 2077 | trans = btrfs_join_transaction(root, 1); |
39279cc3 CM |
2078 | btrfs_set_trans_block_group(trans, inode); |
2079 | ret = btrfs_commit_transaction(trans, root); | |
39279cc3 CM |
2080 | } |
2081 | return ret; | |
2082 | } | |
2083 | ||
2084 | /* | |
54aa1f4d | 2085 | * This is somewhat expensive, updating the tree every time the |
39279cc3 CM |
2086 | * inode changes. But, it is most likely to find the inode in cache. |
2087 | * FIXME, needs more benchmarking...there are no reasons other than performance | |
2088 | * to keep or drop this code. | |
2089 | */ | |
2090 | void btrfs_dirty_inode(struct inode *inode) | |
2091 | { | |
2092 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2093 | struct btrfs_trans_handle *trans; | |
2094 | ||
f9295749 | 2095 | trans = btrfs_join_transaction(root, 1); |
39279cc3 CM |
2096 | btrfs_set_trans_block_group(trans, inode); |
2097 | btrfs_update_inode(trans, root, inode); | |
2098 | btrfs_end_transaction(trans, root); | |
39279cc3 CM |
2099 | } |
2100 | ||
aec7477b JB |
2101 | static int btrfs_set_inode_index_count(struct inode *inode) |
2102 | { | |
2103 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2104 | struct btrfs_key key, found_key; | |
2105 | struct btrfs_path *path; | |
2106 | struct extent_buffer *leaf; | |
2107 | int ret; | |
2108 | ||
2109 | key.objectid = inode->i_ino; | |
2110 | btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY); | |
2111 | key.offset = (u64)-1; | |
2112 | ||
2113 | path = btrfs_alloc_path(); | |
2114 | if (!path) | |
2115 | return -ENOMEM; | |
2116 | ||
2117 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2118 | if (ret < 0) | |
2119 | goto out; | |
2120 | /* FIXME: we should be able to handle this */ | |
2121 | if (ret == 0) | |
2122 | goto out; | |
2123 | ret = 0; | |
2124 | ||
2125 | /* | |
2126 | * MAGIC NUMBER EXPLANATION: | |
2127 | * since we search a directory based on f_pos we have to start at 2 | |
2128 | * since '.' and '..' have f_pos of 0 and 1 respectively, so everybody | |
2129 | * else has to start at 2 | |
2130 | */ | |
2131 | if (path->slots[0] == 0) { | |
2132 | BTRFS_I(inode)->index_cnt = 2; | |
2133 | goto out; | |
2134 | } | |
2135 | ||
2136 | path->slots[0]--; | |
2137 | ||
2138 | leaf = path->nodes[0]; | |
2139 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
2140 | ||
2141 | if (found_key.objectid != inode->i_ino || | |
2142 | btrfs_key_type(&found_key) != BTRFS_DIR_INDEX_KEY) { | |
2143 | BTRFS_I(inode)->index_cnt = 2; | |
2144 | goto out; | |
2145 | } | |
2146 | ||
2147 | BTRFS_I(inode)->index_cnt = found_key.offset + 1; | |
2148 | out: | |
2149 | btrfs_free_path(path); | |
2150 | return ret; | |
2151 | } | |
2152 | ||
00e4e6b3 CM |
2153 | static int btrfs_set_inode_index(struct inode *dir, struct inode *inode, |
2154 | u64 *index) | |
aec7477b JB |
2155 | { |
2156 | int ret = 0; | |
2157 | ||
2158 | if (BTRFS_I(dir)->index_cnt == (u64)-1) { | |
2159 | ret = btrfs_set_inode_index_count(dir); | |
2160 | if (ret) | |
2161 | return ret; | |
2162 | } | |
2163 | ||
00e4e6b3 | 2164 | *index = BTRFS_I(dir)->index_cnt; |
aec7477b JB |
2165 | BTRFS_I(dir)->index_cnt++; |
2166 | ||
2167 | return ret; | |
2168 | } | |
2169 | ||
39279cc3 CM |
2170 | static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans, |
2171 | struct btrfs_root *root, | |
aec7477b | 2172 | struct inode *dir, |
9c58309d CM |
2173 | const char *name, int name_len, |
2174 | u64 ref_objectid, | |
39279cc3 CM |
2175 | u64 objectid, |
2176 | struct btrfs_block_group_cache *group, | |
00e4e6b3 | 2177 | int mode, u64 *index) |
39279cc3 CM |
2178 | { |
2179 | struct inode *inode; | |
5f39d397 | 2180 | struct btrfs_inode_item *inode_item; |
6324fbf3 | 2181 | struct btrfs_block_group_cache *new_inode_group; |
39279cc3 | 2182 | struct btrfs_key *location; |
5f39d397 | 2183 | struct btrfs_path *path; |
9c58309d CM |
2184 | struct btrfs_inode_ref *ref; |
2185 | struct btrfs_key key[2]; | |
2186 | u32 sizes[2]; | |
2187 | unsigned long ptr; | |
39279cc3 CM |
2188 | int ret; |
2189 | int owner; | |
2190 | ||
5f39d397 CM |
2191 | path = btrfs_alloc_path(); |
2192 | BUG_ON(!path); | |
2193 | ||
39279cc3 CM |
2194 | inode = new_inode(root->fs_info->sb); |
2195 | if (!inode) | |
2196 | return ERR_PTR(-ENOMEM); | |
2197 | ||
aec7477b | 2198 | if (dir) { |
00e4e6b3 | 2199 | ret = btrfs_set_inode_index(dir, inode, index); |
aec7477b JB |
2200 | if (ret) |
2201 | return ERR_PTR(ret); | |
aec7477b JB |
2202 | } |
2203 | /* | |
2204 | * index_cnt is ignored for everything but a dir, | |
2205 | * btrfs_get_inode_index_count has an explanation for the magic | |
2206 | * number | |
2207 | */ | |
2208 | BTRFS_I(inode)->index_cnt = 2; | |
2209 | ||
d1310b2e CM |
2210 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2211 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
b888db2b | 2212 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
2213 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
2214 | inode->i_mapping, GFP_NOFS); | |
ba1da2f4 | 2215 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
ea8c2819 | 2216 | INIT_LIST_HEAD(&BTRFS_I(inode)->delalloc_inodes); |
1b1e2135 | 2217 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 2218 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
9069218d | 2219 | BTRFS_I(inode)->delalloc_bytes = 0; |
db69e0eb | 2220 | inode->i_mapping->writeback_index = 0; |
dbe674a9 | 2221 | BTRFS_I(inode)->disk_i_size = 0; |
39279cc3 | 2222 | BTRFS_I(inode)->root = root; |
b888db2b | 2223 | |
39279cc3 CM |
2224 | if (mode & S_IFDIR) |
2225 | owner = 0; | |
2226 | else | |
2227 | owner = 1; | |
6324fbf3 | 2228 | new_inode_group = btrfs_find_block_group(root, group, 0, |
0b86a832 | 2229 | BTRFS_BLOCK_GROUP_METADATA, owner); |
6324fbf3 CM |
2230 | if (!new_inode_group) { |
2231 | printk("find_block group failed\n"); | |
2232 | new_inode_group = group; | |
2233 | } | |
2234 | BTRFS_I(inode)->block_group = new_inode_group; | |
b98b6767 | 2235 | BTRFS_I(inode)->flags = 0; |
9c58309d CM |
2236 | |
2237 | key[0].objectid = objectid; | |
2238 | btrfs_set_key_type(&key[0], BTRFS_INODE_ITEM_KEY); | |
2239 | key[0].offset = 0; | |
2240 | ||
2241 | key[1].objectid = objectid; | |
2242 | btrfs_set_key_type(&key[1], BTRFS_INODE_REF_KEY); | |
2243 | key[1].offset = ref_objectid; | |
2244 | ||
2245 | sizes[0] = sizeof(struct btrfs_inode_item); | |
2246 | sizes[1] = name_len + sizeof(*ref); | |
2247 | ||
2248 | ret = btrfs_insert_empty_items(trans, root, path, key, sizes, 2); | |
2249 | if (ret != 0) | |
5f39d397 CM |
2250 | goto fail; |
2251 | ||
9c58309d CM |
2252 | if (objectid > root->highest_inode) |
2253 | root->highest_inode = objectid; | |
2254 | ||
39279cc3 CM |
2255 | inode->i_uid = current->fsuid; |
2256 | inode->i_gid = current->fsgid; | |
2257 | inode->i_mode = mode; | |
2258 | inode->i_ino = objectid; | |
2259 | inode->i_blocks = 0; | |
2260 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
5f39d397 CM |
2261 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
2262 | struct btrfs_inode_item); | |
2263 | fill_inode_item(path->nodes[0], inode_item, inode); | |
9c58309d CM |
2264 | |
2265 | ref = btrfs_item_ptr(path->nodes[0], path->slots[0] + 1, | |
2266 | struct btrfs_inode_ref); | |
2267 | btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len); | |
00e4e6b3 | 2268 | btrfs_set_inode_ref_index(path->nodes[0], ref, *index); |
9c58309d CM |
2269 | ptr = (unsigned long)(ref + 1); |
2270 | write_extent_buffer(path->nodes[0], name, ptr, name_len); | |
2271 | ||
5f39d397 CM |
2272 | btrfs_mark_buffer_dirty(path->nodes[0]); |
2273 | btrfs_free_path(path); | |
2274 | ||
39279cc3 CM |
2275 | location = &BTRFS_I(inode)->location; |
2276 | location->objectid = objectid; | |
39279cc3 CM |
2277 | location->offset = 0; |
2278 | btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY); | |
2279 | ||
39279cc3 CM |
2280 | insert_inode_hash(inode); |
2281 | return inode; | |
5f39d397 | 2282 | fail: |
aec7477b JB |
2283 | if (dir) |
2284 | BTRFS_I(dir)->index_cnt--; | |
5f39d397 CM |
2285 | btrfs_free_path(path); |
2286 | return ERR_PTR(ret); | |
39279cc3 CM |
2287 | } |
2288 | ||
2289 | static inline u8 btrfs_inode_type(struct inode *inode) | |
2290 | { | |
2291 | return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT]; | |
2292 | } | |
2293 | ||
2294 | static int btrfs_add_link(struct btrfs_trans_handle *trans, | |
9c58309d | 2295 | struct dentry *dentry, struct inode *inode, |
00e4e6b3 | 2296 | int add_backref, u64 index) |
39279cc3 CM |
2297 | { |
2298 | int ret; | |
2299 | struct btrfs_key key; | |
2300 | struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root; | |
aec7477b | 2301 | struct inode *parent_inode = dentry->d_parent->d_inode; |
5f39d397 | 2302 | |
39279cc3 | 2303 | key.objectid = inode->i_ino; |
39279cc3 CM |
2304 | btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY); |
2305 | key.offset = 0; | |
2306 | ||
2307 | ret = btrfs_insert_dir_item(trans, root, | |
2308 | dentry->d_name.name, dentry->d_name.len, | |
2309 | dentry->d_parent->d_inode->i_ino, | |
aec7477b | 2310 | &key, btrfs_inode_type(inode), |
00e4e6b3 | 2311 | index); |
39279cc3 | 2312 | if (ret == 0) { |
9c58309d CM |
2313 | if (add_backref) { |
2314 | ret = btrfs_insert_inode_ref(trans, root, | |
2315 | dentry->d_name.name, | |
2316 | dentry->d_name.len, | |
2317 | inode->i_ino, | |
aec7477b | 2318 | parent_inode->i_ino, |
00e4e6b3 | 2319 | index); |
9c58309d | 2320 | } |
dbe674a9 CM |
2321 | btrfs_i_size_write(parent_inode, parent_inode->i_size + |
2322 | dentry->d_name.len * 2); | |
79c44584 | 2323 | parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME; |
39279cc3 CM |
2324 | ret = btrfs_update_inode(trans, root, |
2325 | dentry->d_parent->d_inode); | |
2326 | } | |
2327 | return ret; | |
2328 | } | |
2329 | ||
2330 | static int btrfs_add_nondir(struct btrfs_trans_handle *trans, | |
9c58309d | 2331 | struct dentry *dentry, struct inode *inode, |
00e4e6b3 | 2332 | int backref, u64 index) |
39279cc3 | 2333 | { |
00e4e6b3 | 2334 | int err = btrfs_add_link(trans, dentry, inode, backref, index); |
39279cc3 CM |
2335 | if (!err) { |
2336 | d_instantiate(dentry, inode); | |
2337 | return 0; | |
2338 | } | |
2339 | if (err > 0) | |
2340 | err = -EEXIST; | |
2341 | return err; | |
2342 | } | |
2343 | ||
618e21d5 JB |
2344 | static int btrfs_mknod(struct inode *dir, struct dentry *dentry, |
2345 | int mode, dev_t rdev) | |
2346 | { | |
2347 | struct btrfs_trans_handle *trans; | |
2348 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 2349 | struct inode *inode = NULL; |
618e21d5 JB |
2350 | int err; |
2351 | int drop_inode = 0; | |
2352 | u64 objectid; | |
1832a6d5 | 2353 | unsigned long nr = 0; |
00e4e6b3 | 2354 | u64 index = 0; |
618e21d5 JB |
2355 | |
2356 | if (!new_valid_dev(rdev)) | |
2357 | return -EINVAL; | |
2358 | ||
1832a6d5 CM |
2359 | err = btrfs_check_free_space(root, 1, 0); |
2360 | if (err) | |
2361 | goto fail; | |
2362 | ||
618e21d5 JB |
2363 | trans = btrfs_start_transaction(root, 1); |
2364 | btrfs_set_trans_block_group(trans, dir); | |
2365 | ||
2366 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2367 | if (err) { | |
2368 | err = -ENOSPC; | |
2369 | goto out_unlock; | |
2370 | } | |
2371 | ||
aec7477b | 2372 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
2373 | dentry->d_name.len, |
2374 | dentry->d_parent->d_inode->i_ino, objectid, | |
00e4e6b3 | 2375 | BTRFS_I(dir)->block_group, mode, &index); |
618e21d5 JB |
2376 | err = PTR_ERR(inode); |
2377 | if (IS_ERR(inode)) | |
2378 | goto out_unlock; | |
2379 | ||
33268eaf JB |
2380 | err = btrfs_init_acl(inode, dir); |
2381 | if (err) { | |
2382 | drop_inode = 1; | |
2383 | goto out_unlock; | |
2384 | } | |
2385 | ||
618e21d5 | 2386 | btrfs_set_trans_block_group(trans, inode); |
00e4e6b3 | 2387 | err = btrfs_add_nondir(trans, dentry, inode, 0, index); |
618e21d5 JB |
2388 | if (err) |
2389 | drop_inode = 1; | |
2390 | else { | |
2391 | inode->i_op = &btrfs_special_inode_operations; | |
2392 | init_special_inode(inode, inode->i_mode, rdev); | |
1b4ab1bb | 2393 | btrfs_update_inode(trans, root, inode); |
618e21d5 JB |
2394 | } |
2395 | dir->i_sb->s_dirt = 1; | |
2396 | btrfs_update_inode_block_group(trans, inode); | |
2397 | btrfs_update_inode_block_group(trans, dir); | |
2398 | out_unlock: | |
d3c2fdcf | 2399 | nr = trans->blocks_used; |
89ce8a63 | 2400 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2401 | fail: |
618e21d5 JB |
2402 | if (drop_inode) { |
2403 | inode_dec_link_count(inode); | |
2404 | iput(inode); | |
2405 | } | |
d3c2fdcf | 2406 | btrfs_btree_balance_dirty(root, nr); |
618e21d5 JB |
2407 | return err; |
2408 | } | |
2409 | ||
39279cc3 CM |
2410 | static int btrfs_create(struct inode *dir, struct dentry *dentry, |
2411 | int mode, struct nameidata *nd) | |
2412 | { | |
2413 | struct btrfs_trans_handle *trans; | |
2414 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
1832a6d5 | 2415 | struct inode *inode = NULL; |
39279cc3 CM |
2416 | int err; |
2417 | int drop_inode = 0; | |
1832a6d5 | 2418 | unsigned long nr = 0; |
39279cc3 | 2419 | u64 objectid; |
00e4e6b3 | 2420 | u64 index = 0; |
39279cc3 | 2421 | |
1832a6d5 CM |
2422 | err = btrfs_check_free_space(root, 1, 0); |
2423 | if (err) | |
2424 | goto fail; | |
39279cc3 CM |
2425 | trans = btrfs_start_transaction(root, 1); |
2426 | btrfs_set_trans_block_group(trans, dir); | |
2427 | ||
2428 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2429 | if (err) { | |
2430 | err = -ENOSPC; | |
2431 | goto out_unlock; | |
2432 | } | |
2433 | ||
aec7477b | 2434 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
2435 | dentry->d_name.len, |
2436 | dentry->d_parent->d_inode->i_ino, | |
00e4e6b3 CM |
2437 | objectid, BTRFS_I(dir)->block_group, mode, |
2438 | &index); | |
39279cc3 CM |
2439 | err = PTR_ERR(inode); |
2440 | if (IS_ERR(inode)) | |
2441 | goto out_unlock; | |
2442 | ||
33268eaf JB |
2443 | err = btrfs_init_acl(inode, dir); |
2444 | if (err) { | |
2445 | drop_inode = 1; | |
2446 | goto out_unlock; | |
2447 | } | |
2448 | ||
39279cc3 | 2449 | btrfs_set_trans_block_group(trans, inode); |
00e4e6b3 | 2450 | err = btrfs_add_nondir(trans, dentry, inode, 0, index); |
39279cc3 CM |
2451 | if (err) |
2452 | drop_inode = 1; | |
2453 | else { | |
2454 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 2455 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
2456 | inode->i_fop = &btrfs_file_operations; |
2457 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
2458 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
2459 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 2460 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
2461 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
2462 | inode->i_mapping, GFP_NOFS); | |
ea8c2819 | 2463 | INIT_LIST_HEAD(&BTRFS_I(inode)->delalloc_inodes); |
1b1e2135 | 2464 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 2465 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
9069218d | 2466 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 2467 | BTRFS_I(inode)->disk_i_size = 0; |
db69e0eb | 2468 | inode->i_mapping->writeback_index = 0; |
d1310b2e | 2469 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
ba1da2f4 | 2470 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
39279cc3 CM |
2471 | } |
2472 | dir->i_sb->s_dirt = 1; | |
2473 | btrfs_update_inode_block_group(trans, inode); | |
2474 | btrfs_update_inode_block_group(trans, dir); | |
2475 | out_unlock: | |
d3c2fdcf | 2476 | nr = trans->blocks_used; |
ab78c84d | 2477 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2478 | fail: |
39279cc3 CM |
2479 | if (drop_inode) { |
2480 | inode_dec_link_count(inode); | |
2481 | iput(inode); | |
2482 | } | |
d3c2fdcf | 2483 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2484 | return err; |
2485 | } | |
2486 | ||
2487 | static int btrfs_link(struct dentry *old_dentry, struct inode *dir, | |
2488 | struct dentry *dentry) | |
2489 | { | |
2490 | struct btrfs_trans_handle *trans; | |
2491 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2492 | struct inode *inode = old_dentry->d_inode; | |
00e4e6b3 | 2493 | u64 index; |
1832a6d5 | 2494 | unsigned long nr = 0; |
39279cc3 CM |
2495 | int err; |
2496 | int drop_inode = 0; | |
2497 | ||
2498 | if (inode->i_nlink == 0) | |
2499 | return -ENOENT; | |
2500 | ||
6da6abae CM |
2501 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
2502 | inode->i_nlink++; | |
2503 | #else | |
39279cc3 | 2504 | inc_nlink(inode); |
6da6abae | 2505 | #endif |
1832a6d5 CM |
2506 | err = btrfs_check_free_space(root, 1, 0); |
2507 | if (err) | |
2508 | goto fail; | |
00e4e6b3 | 2509 | err = btrfs_set_inode_index(dir, inode, &index); |
aec7477b JB |
2510 | if (err) |
2511 | goto fail; | |
2512 | ||
39279cc3 | 2513 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 2514 | |
39279cc3 CM |
2515 | btrfs_set_trans_block_group(trans, dir); |
2516 | atomic_inc(&inode->i_count); | |
aec7477b | 2517 | |
00e4e6b3 | 2518 | err = btrfs_add_nondir(trans, dentry, inode, 1, index); |
5f39d397 | 2519 | |
39279cc3 CM |
2520 | if (err) |
2521 | drop_inode = 1; | |
5f39d397 | 2522 | |
39279cc3 CM |
2523 | dir->i_sb->s_dirt = 1; |
2524 | btrfs_update_inode_block_group(trans, dir); | |
54aa1f4d | 2525 | err = btrfs_update_inode(trans, root, inode); |
5f39d397 | 2526 | |
54aa1f4d CM |
2527 | if (err) |
2528 | drop_inode = 1; | |
39279cc3 | 2529 | |
d3c2fdcf | 2530 | nr = trans->blocks_used; |
ab78c84d | 2531 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 2532 | fail: |
39279cc3 CM |
2533 | if (drop_inode) { |
2534 | inode_dec_link_count(inode); | |
2535 | iput(inode); | |
2536 | } | |
d3c2fdcf | 2537 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2538 | return err; |
2539 | } | |
2540 | ||
39279cc3 CM |
2541 | static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
2542 | { | |
b9d86667 | 2543 | struct inode *inode = NULL; |
39279cc3 CM |
2544 | struct btrfs_trans_handle *trans; |
2545 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
2546 | int err = 0; | |
2547 | int drop_on_err = 0; | |
b9d86667 | 2548 | u64 objectid = 0; |
00e4e6b3 | 2549 | u64 index = 0; |
d3c2fdcf | 2550 | unsigned long nr = 1; |
39279cc3 | 2551 | |
1832a6d5 CM |
2552 | err = btrfs_check_free_space(root, 1, 0); |
2553 | if (err) | |
2554 | goto out_unlock; | |
2555 | ||
39279cc3 CM |
2556 | trans = btrfs_start_transaction(root, 1); |
2557 | btrfs_set_trans_block_group(trans, dir); | |
5f39d397 | 2558 | |
39279cc3 CM |
2559 | if (IS_ERR(trans)) { |
2560 | err = PTR_ERR(trans); | |
2561 | goto out_unlock; | |
2562 | } | |
2563 | ||
2564 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
2565 | if (err) { | |
2566 | err = -ENOSPC; | |
2567 | goto out_unlock; | |
2568 | } | |
2569 | ||
aec7477b | 2570 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
2571 | dentry->d_name.len, |
2572 | dentry->d_parent->d_inode->i_ino, objectid, | |
00e4e6b3 CM |
2573 | BTRFS_I(dir)->block_group, S_IFDIR | mode, |
2574 | &index); | |
39279cc3 CM |
2575 | if (IS_ERR(inode)) { |
2576 | err = PTR_ERR(inode); | |
2577 | goto out_fail; | |
2578 | } | |
5f39d397 | 2579 | |
39279cc3 | 2580 | drop_on_err = 1; |
33268eaf JB |
2581 | |
2582 | err = btrfs_init_acl(inode, dir); | |
2583 | if (err) | |
2584 | goto out_fail; | |
2585 | ||
39279cc3 CM |
2586 | inode->i_op = &btrfs_dir_inode_operations; |
2587 | inode->i_fop = &btrfs_dir_file_operations; | |
2588 | btrfs_set_trans_block_group(trans, inode); | |
2589 | ||
dbe674a9 | 2590 | btrfs_i_size_write(inode, 0); |
39279cc3 CM |
2591 | err = btrfs_update_inode(trans, root, inode); |
2592 | if (err) | |
2593 | goto out_fail; | |
5f39d397 | 2594 | |
00e4e6b3 | 2595 | err = btrfs_add_link(trans, dentry, inode, 0, index); |
39279cc3 CM |
2596 | if (err) |
2597 | goto out_fail; | |
5f39d397 | 2598 | |
39279cc3 CM |
2599 | d_instantiate(dentry, inode); |
2600 | drop_on_err = 0; | |
2601 | dir->i_sb->s_dirt = 1; | |
2602 | btrfs_update_inode_block_group(trans, inode); | |
2603 | btrfs_update_inode_block_group(trans, dir); | |
2604 | ||
2605 | out_fail: | |
d3c2fdcf | 2606 | nr = trans->blocks_used; |
ab78c84d | 2607 | btrfs_end_transaction_throttle(trans, root); |
5f39d397 | 2608 | |
39279cc3 | 2609 | out_unlock: |
39279cc3 CM |
2610 | if (drop_on_err) |
2611 | iput(inode); | |
d3c2fdcf | 2612 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
2613 | return err; |
2614 | } | |
2615 | ||
3b951516 CM |
2616 | static int merge_extent_mapping(struct extent_map_tree *em_tree, |
2617 | struct extent_map *existing, | |
e6dcd2dc CM |
2618 | struct extent_map *em, |
2619 | u64 map_start, u64 map_len) | |
3b951516 CM |
2620 | { |
2621 | u64 start_diff; | |
3b951516 | 2622 | |
e6dcd2dc CM |
2623 | BUG_ON(map_start < em->start || map_start >= extent_map_end(em)); |
2624 | start_diff = map_start - em->start; | |
2625 | em->start = map_start; | |
2626 | em->len = map_len; | |
2627 | if (em->block_start < EXTENT_MAP_LAST_BYTE) | |
2628 | em->block_start += start_diff; | |
2629 | return add_extent_mapping(em_tree, em); | |
3b951516 CM |
2630 | } |
2631 | ||
a52d9a80 | 2632 | struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page, |
70dec807 | 2633 | size_t pg_offset, u64 start, u64 len, |
a52d9a80 CM |
2634 | int create) |
2635 | { | |
2636 | int ret; | |
2637 | int err = 0; | |
db94535d | 2638 | u64 bytenr; |
a52d9a80 CM |
2639 | u64 extent_start = 0; |
2640 | u64 extent_end = 0; | |
2641 | u64 objectid = inode->i_ino; | |
2642 | u32 found_type; | |
f421950f | 2643 | struct btrfs_path *path = NULL; |
a52d9a80 CM |
2644 | struct btrfs_root *root = BTRFS_I(inode)->root; |
2645 | struct btrfs_file_extent_item *item; | |
5f39d397 CM |
2646 | struct extent_buffer *leaf; |
2647 | struct btrfs_key found_key; | |
a52d9a80 CM |
2648 | struct extent_map *em = NULL; |
2649 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
d1310b2e | 2650 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
a52d9a80 CM |
2651 | struct btrfs_trans_handle *trans = NULL; |
2652 | ||
a52d9a80 | 2653 | again: |
d1310b2e CM |
2654 | spin_lock(&em_tree->lock); |
2655 | em = lookup_extent_mapping(em_tree, start, len); | |
a061fc8d CM |
2656 | if (em) |
2657 | em->bdev = root->fs_info->fs_devices->latest_bdev; | |
d1310b2e CM |
2658 | spin_unlock(&em_tree->lock); |
2659 | ||
a52d9a80 | 2660 | if (em) { |
e1c4b745 CM |
2661 | if (em->start > start || em->start + em->len <= start) |
2662 | free_extent_map(em); | |
2663 | else if (em->block_start == EXTENT_MAP_INLINE && page) | |
70dec807 CM |
2664 | free_extent_map(em); |
2665 | else | |
2666 | goto out; | |
a52d9a80 | 2667 | } |
d1310b2e | 2668 | em = alloc_extent_map(GFP_NOFS); |
a52d9a80 | 2669 | if (!em) { |
d1310b2e CM |
2670 | err = -ENOMEM; |
2671 | goto out; | |
a52d9a80 | 2672 | } |
e6dcd2dc | 2673 | em->bdev = root->fs_info->fs_devices->latest_bdev; |
d1310b2e CM |
2674 | em->start = EXTENT_MAP_HOLE; |
2675 | em->len = (u64)-1; | |
f421950f CM |
2676 | |
2677 | if (!path) { | |
2678 | path = btrfs_alloc_path(); | |
2679 | BUG_ON(!path); | |
2680 | } | |
2681 | ||
179e29e4 CM |
2682 | ret = btrfs_lookup_file_extent(trans, root, path, |
2683 | objectid, start, trans != NULL); | |
a52d9a80 CM |
2684 | if (ret < 0) { |
2685 | err = ret; | |
2686 | goto out; | |
2687 | } | |
2688 | ||
2689 | if (ret != 0) { | |
2690 | if (path->slots[0] == 0) | |
2691 | goto not_found; | |
2692 | path->slots[0]--; | |
2693 | } | |
2694 | ||
5f39d397 CM |
2695 | leaf = path->nodes[0]; |
2696 | item = btrfs_item_ptr(leaf, path->slots[0], | |
a52d9a80 | 2697 | struct btrfs_file_extent_item); |
a52d9a80 | 2698 | /* are we inside the extent that was found? */ |
5f39d397 CM |
2699 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
2700 | found_type = btrfs_key_type(&found_key); | |
2701 | if (found_key.objectid != objectid || | |
a52d9a80 CM |
2702 | found_type != BTRFS_EXTENT_DATA_KEY) { |
2703 | goto not_found; | |
2704 | } | |
2705 | ||
5f39d397 CM |
2706 | found_type = btrfs_file_extent_type(leaf, item); |
2707 | extent_start = found_key.offset; | |
a52d9a80 CM |
2708 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
2709 | extent_end = extent_start + | |
db94535d | 2710 | btrfs_file_extent_num_bytes(leaf, item); |
a52d9a80 | 2711 | err = 0; |
b888db2b | 2712 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2713 | em->start = start; |
2714 | if (start < extent_start) { | |
d1310b2e | 2715 | if (start + len <= extent_start) |
b888db2b | 2716 | goto not_found; |
d1310b2e | 2717 | em->len = extent_end - extent_start; |
a52d9a80 | 2718 | } else { |
d1310b2e | 2719 | em->len = len; |
a52d9a80 CM |
2720 | } |
2721 | goto not_found_em; | |
2722 | } | |
db94535d CM |
2723 | bytenr = btrfs_file_extent_disk_bytenr(leaf, item); |
2724 | if (bytenr == 0) { | |
a52d9a80 | 2725 | em->start = extent_start; |
d1310b2e | 2726 | em->len = extent_end - extent_start; |
5f39d397 | 2727 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2728 | goto insert; |
2729 | } | |
db94535d CM |
2730 | bytenr += btrfs_file_extent_offset(leaf, item); |
2731 | em->block_start = bytenr; | |
a52d9a80 | 2732 | em->start = extent_start; |
d1310b2e | 2733 | em->len = extent_end - extent_start; |
a52d9a80 CM |
2734 | goto insert; |
2735 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
70dec807 | 2736 | u64 page_start; |
5f39d397 | 2737 | unsigned long ptr; |
a52d9a80 | 2738 | char *map; |
3326d1b0 CM |
2739 | size_t size; |
2740 | size_t extent_offset; | |
2741 | size_t copy_size; | |
a52d9a80 | 2742 | |
5f39d397 CM |
2743 | size = btrfs_file_extent_inline_len(leaf, btrfs_item_nr(leaf, |
2744 | path->slots[0])); | |
d1310b2e CM |
2745 | extent_end = (extent_start + size + root->sectorsize - 1) & |
2746 | ~((u64)root->sectorsize - 1); | |
b888db2b | 2747 | if (start < extent_start || start >= extent_end) { |
a52d9a80 CM |
2748 | em->start = start; |
2749 | if (start < extent_start) { | |
d1310b2e | 2750 | if (start + len <= extent_start) |
b888db2b | 2751 | goto not_found; |
d1310b2e | 2752 | em->len = extent_end - extent_start; |
a52d9a80 | 2753 | } else { |
d1310b2e | 2754 | em->len = len; |
a52d9a80 CM |
2755 | } |
2756 | goto not_found_em; | |
2757 | } | |
689f9346 | 2758 | em->block_start = EXTENT_MAP_INLINE; |
689f9346 Y |
2759 | |
2760 | if (!page) { | |
2761 | em->start = extent_start; | |
d1310b2e | 2762 | em->len = size; |
689f9346 Y |
2763 | goto out; |
2764 | } | |
5f39d397 | 2765 | |
70dec807 CM |
2766 | page_start = page_offset(page) + pg_offset; |
2767 | extent_offset = page_start - extent_start; | |
2768 | copy_size = min_t(u64, PAGE_CACHE_SIZE - pg_offset, | |
3326d1b0 | 2769 | size - extent_offset); |
3326d1b0 | 2770 | em->start = extent_start + extent_offset; |
70dec807 CM |
2771 | em->len = (copy_size + root->sectorsize - 1) & |
2772 | ~((u64)root->sectorsize - 1); | |
689f9346 Y |
2773 | map = kmap(page); |
2774 | ptr = btrfs_file_extent_inline_start(item) + extent_offset; | |
179e29e4 | 2775 | if (create == 0 && !PageUptodate(page)) { |
70dec807 | 2776 | read_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2777 | copy_size); |
2778 | flush_dcache_page(page); | |
2779 | } else if (create && PageUptodate(page)) { | |
2780 | if (!trans) { | |
2781 | kunmap(page); | |
2782 | free_extent_map(em); | |
2783 | em = NULL; | |
2784 | btrfs_release_path(root, path); | |
f9295749 | 2785 | trans = btrfs_join_transaction(root, 1); |
179e29e4 CM |
2786 | goto again; |
2787 | } | |
70dec807 | 2788 | write_extent_buffer(leaf, map + pg_offset, ptr, |
179e29e4 CM |
2789 | copy_size); |
2790 | btrfs_mark_buffer_dirty(leaf); | |
a52d9a80 | 2791 | } |
a52d9a80 | 2792 | kunmap(page); |
d1310b2e CM |
2793 | set_extent_uptodate(io_tree, em->start, |
2794 | extent_map_end(em) - 1, GFP_NOFS); | |
a52d9a80 CM |
2795 | goto insert; |
2796 | } else { | |
2797 | printk("unkknown found_type %d\n", found_type); | |
2798 | WARN_ON(1); | |
2799 | } | |
2800 | not_found: | |
2801 | em->start = start; | |
d1310b2e | 2802 | em->len = len; |
a52d9a80 | 2803 | not_found_em: |
5f39d397 | 2804 | em->block_start = EXTENT_MAP_HOLE; |
a52d9a80 CM |
2805 | insert: |
2806 | btrfs_release_path(root, path); | |
d1310b2e CM |
2807 | if (em->start > start || extent_map_end(em) <= start) { |
2808 | printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->len, start, len); | |
a52d9a80 CM |
2809 | err = -EIO; |
2810 | goto out; | |
2811 | } | |
d1310b2e CM |
2812 | |
2813 | err = 0; | |
2814 | spin_lock(&em_tree->lock); | |
a52d9a80 | 2815 | ret = add_extent_mapping(em_tree, em); |
3b951516 CM |
2816 | /* it is possible that someone inserted the extent into the tree |
2817 | * while we had the lock dropped. It is also possible that | |
2818 | * an overlapping map exists in the tree | |
2819 | */ | |
a52d9a80 | 2820 | if (ret == -EEXIST) { |
3b951516 | 2821 | struct extent_map *existing; |
e6dcd2dc CM |
2822 | |
2823 | ret = 0; | |
2824 | ||
3b951516 | 2825 | existing = lookup_extent_mapping(em_tree, start, len); |
e1c4b745 CM |
2826 | if (existing && (existing->start > start || |
2827 | existing->start + existing->len <= start)) { | |
2828 | free_extent_map(existing); | |
2829 | existing = NULL; | |
2830 | } | |
3b951516 CM |
2831 | if (!existing) { |
2832 | existing = lookup_extent_mapping(em_tree, em->start, | |
2833 | em->len); | |
2834 | if (existing) { | |
2835 | err = merge_extent_mapping(em_tree, existing, | |
e6dcd2dc CM |
2836 | em, start, |
2837 | root->sectorsize); | |
3b951516 CM |
2838 | free_extent_map(existing); |
2839 | if (err) { | |
2840 | free_extent_map(em); | |
2841 | em = NULL; | |
2842 | } | |
2843 | } else { | |
2844 | err = -EIO; | |
2845 | printk("failing to insert %Lu %Lu\n", | |
2846 | start, len); | |
2847 | free_extent_map(em); | |
2848 | em = NULL; | |
2849 | } | |
2850 | } else { | |
2851 | free_extent_map(em); | |
2852 | em = existing; | |
e6dcd2dc | 2853 | err = 0; |
a52d9a80 | 2854 | } |
a52d9a80 | 2855 | } |
d1310b2e | 2856 | spin_unlock(&em_tree->lock); |
a52d9a80 | 2857 | out: |
f421950f CM |
2858 | if (path) |
2859 | btrfs_free_path(path); | |
a52d9a80 CM |
2860 | if (trans) { |
2861 | ret = btrfs_end_transaction(trans, root); | |
e6dcd2dc | 2862 | if (!err) { |
a52d9a80 | 2863 | err = ret; |
e6dcd2dc | 2864 | } |
a52d9a80 | 2865 | } |
a52d9a80 CM |
2866 | if (err) { |
2867 | free_extent_map(em); | |
2868 | WARN_ON(1); | |
2869 | return ERR_PTR(err); | |
2870 | } | |
2871 | return em; | |
2872 | } | |
2873 | ||
e1c4b745 | 2874 | #if 0 /* waiting for O_DIRECT reads */ |
16432985 CM |
2875 | static int btrfs_get_block(struct inode *inode, sector_t iblock, |
2876 | struct buffer_head *bh_result, int create) | |
2877 | { | |
2878 | struct extent_map *em; | |
2879 | u64 start = (u64)iblock << inode->i_blkbits; | |
2880 | struct btrfs_multi_bio *multi = NULL; | |
2881 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2882 | u64 len; | |
2883 | u64 logical; | |
2884 | u64 map_length; | |
2885 | int ret = 0; | |
2886 | ||
2887 | em = btrfs_get_extent(inode, NULL, 0, start, bh_result->b_size, 0); | |
2888 | ||
2889 | if (!em || IS_ERR(em)) | |
2890 | goto out; | |
2891 | ||
e1c4b745 | 2892 | if (em->start > start || em->start + em->len <= start) { |
16432985 | 2893 | goto out; |
e1c4b745 | 2894 | } |
16432985 CM |
2895 | |
2896 | if (em->block_start == EXTENT_MAP_INLINE) { | |
2897 | ret = -EINVAL; | |
2898 | goto out; | |
2899 | } | |
2900 | ||
e1c4b745 CM |
2901 | len = em->start + em->len - start; |
2902 | len = min_t(u64, len, INT_LIMIT(typeof(bh_result->b_size))); | |
2903 | ||
16432985 CM |
2904 | if (em->block_start == EXTENT_MAP_HOLE || |
2905 | em->block_start == EXTENT_MAP_DELALLOC) { | |
e1c4b745 | 2906 | bh_result->b_size = len; |
16432985 CM |
2907 | goto out; |
2908 | } | |
2909 | ||
16432985 CM |
2910 | logical = start - em->start; |
2911 | logical = em->block_start + logical; | |
2912 | ||
2913 | map_length = len; | |
2914 | ret = btrfs_map_block(&root->fs_info->mapping_tree, READ, | |
2915 | logical, &map_length, &multi, 0); | |
2916 | BUG_ON(ret); | |
2917 | bh_result->b_blocknr = multi->stripes[0].physical >> inode->i_blkbits; | |
2918 | bh_result->b_size = min(map_length, len); | |
e1c4b745 | 2919 | |
16432985 CM |
2920 | bh_result->b_bdev = multi->stripes[0].dev->bdev; |
2921 | set_buffer_mapped(bh_result); | |
2922 | kfree(multi); | |
2923 | out: | |
2924 | free_extent_map(em); | |
2925 | return ret; | |
2926 | } | |
e1c4b745 | 2927 | #endif |
16432985 CM |
2928 | |
2929 | static ssize_t btrfs_direct_IO(int rw, struct kiocb *iocb, | |
2930 | const struct iovec *iov, loff_t offset, | |
2931 | unsigned long nr_segs) | |
2932 | { | |
e1c4b745 CM |
2933 | return -EINVAL; |
2934 | #if 0 | |
16432985 CM |
2935 | struct file *file = iocb->ki_filp; |
2936 | struct inode *inode = file->f_mapping->host; | |
2937 | ||
2938 | if (rw == WRITE) | |
2939 | return -EINVAL; | |
2940 | ||
2941 | return blockdev_direct_IO(rw, iocb, inode, inode->i_sb->s_bdev, iov, | |
2942 | offset, nr_segs, btrfs_get_block, NULL); | |
e1c4b745 | 2943 | #endif |
16432985 CM |
2944 | } |
2945 | ||
d396c6f5 | 2946 | static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock) |
39279cc3 | 2947 | { |
d396c6f5 | 2948 | return extent_bmap(mapping, iblock, btrfs_get_extent); |
39279cc3 CM |
2949 | } |
2950 | ||
a52d9a80 | 2951 | int btrfs_readpage(struct file *file, struct page *page) |
9ebefb18 | 2952 | { |
d1310b2e CM |
2953 | struct extent_io_tree *tree; |
2954 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
a52d9a80 | 2955 | return extent_read_full_page(tree, page, btrfs_get_extent); |
9ebefb18 | 2956 | } |
1832a6d5 | 2957 | |
a52d9a80 | 2958 | static int btrfs_writepage(struct page *page, struct writeback_control *wbc) |
39279cc3 | 2959 | { |
d1310b2e | 2960 | struct extent_io_tree *tree; |
b888db2b CM |
2961 | |
2962 | ||
2963 | if (current->flags & PF_MEMALLOC) { | |
2964 | redirty_page_for_writepage(wbc, page); | |
2965 | unlock_page(page); | |
2966 | return 0; | |
2967 | } | |
d1310b2e | 2968 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
a52d9a80 | 2969 | return extent_write_full_page(tree, page, btrfs_get_extent, wbc); |
9ebefb18 CM |
2970 | } |
2971 | ||
f421950f CM |
2972 | int btrfs_writepages(struct address_space *mapping, |
2973 | struct writeback_control *wbc) | |
b293f02e | 2974 | { |
d1310b2e CM |
2975 | struct extent_io_tree *tree; |
2976 | tree = &BTRFS_I(mapping->host)->io_tree; | |
b293f02e CM |
2977 | return extent_writepages(tree, mapping, btrfs_get_extent, wbc); |
2978 | } | |
2979 | ||
3ab2fb5a CM |
2980 | static int |
2981 | btrfs_readpages(struct file *file, struct address_space *mapping, | |
2982 | struct list_head *pages, unsigned nr_pages) | |
2983 | { | |
d1310b2e CM |
2984 | struct extent_io_tree *tree; |
2985 | tree = &BTRFS_I(mapping->host)->io_tree; | |
3ab2fb5a CM |
2986 | return extent_readpages(tree, mapping, pages, nr_pages, |
2987 | btrfs_get_extent); | |
2988 | } | |
e6dcd2dc | 2989 | static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
9ebefb18 | 2990 | { |
d1310b2e CM |
2991 | struct extent_io_tree *tree; |
2992 | struct extent_map_tree *map; | |
a52d9a80 | 2993 | int ret; |
8c2383c3 | 2994 | |
d1310b2e CM |
2995 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
2996 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
70dec807 | 2997 | ret = try_release_extent_mapping(map, tree, page, gfp_flags); |
a52d9a80 CM |
2998 | if (ret == 1) { |
2999 | ClearPagePrivate(page); | |
3000 | set_page_private(page, 0); | |
3001 | page_cache_release(page); | |
39279cc3 | 3002 | } |
a52d9a80 | 3003 | return ret; |
39279cc3 CM |
3004 | } |
3005 | ||
e6dcd2dc CM |
3006 | static int btrfs_releasepage(struct page *page, gfp_t gfp_flags) |
3007 | { | |
e6dcd2dc CM |
3008 | return __btrfs_releasepage(page, gfp_flags); |
3009 | } | |
3010 | ||
a52d9a80 | 3011 | static void btrfs_invalidatepage(struct page *page, unsigned long offset) |
39279cc3 | 3012 | { |
d1310b2e | 3013 | struct extent_io_tree *tree; |
e6dcd2dc CM |
3014 | struct btrfs_ordered_extent *ordered; |
3015 | u64 page_start = page_offset(page); | |
3016 | u64 page_end = page_start + PAGE_CACHE_SIZE - 1; | |
39279cc3 | 3017 | |
e6dcd2dc | 3018 | wait_on_page_writeback(page); |
d1310b2e | 3019 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
e6dcd2dc CM |
3020 | if (offset) { |
3021 | btrfs_releasepage(page, GFP_NOFS); | |
3022 | return; | |
3023 | } | |
3024 | ||
3025 | lock_extent(tree, page_start, page_end, GFP_NOFS); | |
3026 | ordered = btrfs_lookup_ordered_extent(page->mapping->host, | |
3027 | page_offset(page)); | |
3028 | if (ordered) { | |
eb84ae03 CM |
3029 | /* |
3030 | * IO on this page will never be started, so we need | |
3031 | * to account for any ordered extents now | |
3032 | */ | |
e6dcd2dc CM |
3033 | clear_extent_bit(tree, page_start, page_end, |
3034 | EXTENT_DIRTY | EXTENT_DELALLOC | | |
3035 | EXTENT_LOCKED, 1, 0, GFP_NOFS); | |
211f90e6 CM |
3036 | btrfs_finish_ordered_io(page->mapping->host, |
3037 | page_start, page_end); | |
e6dcd2dc CM |
3038 | btrfs_put_ordered_extent(ordered); |
3039 | lock_extent(tree, page_start, page_end, GFP_NOFS); | |
3040 | } | |
3041 | clear_extent_bit(tree, page_start, page_end, | |
3042 | EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | | |
3043 | EXTENT_ORDERED, | |
3044 | 1, 1, GFP_NOFS); | |
3045 | __btrfs_releasepage(page, GFP_NOFS); | |
3046 | ||
4a096752 | 3047 | ClearPageChecked(page); |
9ad6b7bc | 3048 | if (PagePrivate(page)) { |
9ad6b7bc CM |
3049 | ClearPagePrivate(page); |
3050 | set_page_private(page, 0); | |
3051 | page_cache_release(page); | |
3052 | } | |
39279cc3 CM |
3053 | } |
3054 | ||
9ebefb18 CM |
3055 | /* |
3056 | * btrfs_page_mkwrite() is not allowed to change the file size as it gets | |
3057 | * called from a page fault handler when a page is first dirtied. Hence we must | |
3058 | * be careful to check for EOF conditions here. We set the page up correctly | |
3059 | * for a written page which means we get ENOSPC checking when writing into | |
3060 | * holes and correct delalloc and unwritten extent mapping on filesystems that | |
3061 | * support these features. | |
3062 | * | |
3063 | * We are not allowed to take the i_mutex here so we have to play games to | |
3064 | * protect against truncate races as the page could now be beyond EOF. Because | |
3065 | * vmtruncate() writes the inode size before removing pages, once we have the | |
3066 | * page lock we can determine safely if the page is beyond EOF. If it is not | |
3067 | * beyond EOF, then the page is guaranteed safe against truncation until we | |
3068 | * unlock the page. | |
3069 | */ | |
3070 | int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page) | |
3071 | { | |
6da6abae | 3072 | struct inode *inode = fdentry(vma->vm_file)->d_inode; |
1832a6d5 | 3073 | struct btrfs_root *root = BTRFS_I(inode)->root; |
e6dcd2dc CM |
3074 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
3075 | struct btrfs_ordered_extent *ordered; | |
3076 | char *kaddr; | |
3077 | unsigned long zero_start; | |
9ebefb18 | 3078 | loff_t size; |
1832a6d5 | 3079 | int ret; |
a52d9a80 | 3080 | u64 page_start; |
e6dcd2dc | 3081 | u64 page_end; |
9ebefb18 | 3082 | |
1832a6d5 | 3083 | ret = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); |
1832a6d5 CM |
3084 | if (ret) |
3085 | goto out; | |
3086 | ||
3087 | ret = -EINVAL; | |
e6dcd2dc | 3088 | again: |
9ebefb18 | 3089 | lock_page(page); |
9ebefb18 | 3090 | size = i_size_read(inode); |
e6dcd2dc CM |
3091 | page_start = page_offset(page); |
3092 | page_end = page_start + PAGE_CACHE_SIZE - 1; | |
a52d9a80 | 3093 | |
9ebefb18 | 3094 | if ((page->mapping != inode->i_mapping) || |
e6dcd2dc | 3095 | (page_start >= size)) { |
9ebefb18 CM |
3096 | /* page got truncated out from underneath us */ |
3097 | goto out_unlock; | |
3098 | } | |
e6dcd2dc CM |
3099 | wait_on_page_writeback(page); |
3100 | ||
3101 | lock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3102 | set_page_extent_mapped(page); | |
3103 | ||
eb84ae03 CM |
3104 | /* |
3105 | * we can't set the delalloc bits if there are pending ordered | |
3106 | * extents. Drop our locks and wait for them to finish | |
3107 | */ | |
e6dcd2dc CM |
3108 | ordered = btrfs_lookup_ordered_extent(inode, page_start); |
3109 | if (ordered) { | |
3110 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
3111 | unlock_page(page); | |
eb84ae03 | 3112 | btrfs_start_ordered_extent(inode, ordered, 1); |
e6dcd2dc CM |
3113 | btrfs_put_ordered_extent(ordered); |
3114 | goto again; | |
3115 | } | |
3116 | ||
ea8c2819 | 3117 | btrfs_set_extent_delalloc(inode, page_start, page_end); |
e6dcd2dc | 3118 | ret = 0; |
9ebefb18 CM |
3119 | |
3120 | /* page is wholly or partially inside EOF */ | |
a52d9a80 | 3121 | if (page_start + PAGE_CACHE_SIZE > size) |
e6dcd2dc | 3122 | zero_start = size & ~PAGE_CACHE_MASK; |
9ebefb18 | 3123 | else |
e6dcd2dc | 3124 | zero_start = PAGE_CACHE_SIZE; |
9ebefb18 | 3125 | |
e6dcd2dc CM |
3126 | if (zero_start != PAGE_CACHE_SIZE) { |
3127 | kaddr = kmap(page); | |
3128 | memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start); | |
3129 | flush_dcache_page(page); | |
3130 | kunmap(page); | |
3131 | } | |
247e743c | 3132 | ClearPageChecked(page); |
e6dcd2dc CM |
3133 | set_page_dirty(page); |
3134 | unlock_extent(io_tree, page_start, page_end, GFP_NOFS); | |
9ebefb18 CM |
3135 | |
3136 | out_unlock: | |
3137 | unlock_page(page); | |
1832a6d5 | 3138 | out: |
9ebefb18 CM |
3139 | return ret; |
3140 | } | |
3141 | ||
39279cc3 CM |
3142 | static void btrfs_truncate(struct inode *inode) |
3143 | { | |
3144 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
3145 | int ret; | |
3146 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 3147 | unsigned long nr; |
dbe674a9 | 3148 | u64 mask = root->sectorsize - 1; |
39279cc3 CM |
3149 | |
3150 | if (!S_ISREG(inode->i_mode)) | |
3151 | return; | |
3152 | if (IS_APPEND(inode) || IS_IMMUTABLE(inode)) | |
3153 | return; | |
3154 | ||
3155 | btrfs_truncate_page(inode->i_mapping, inode->i_size); | |
4a096752 | 3156 | btrfs_wait_ordered_range(inode, inode->i_size & (~mask), (u64)-1); |
39279cc3 | 3157 | |
39279cc3 CM |
3158 | trans = btrfs_start_transaction(root, 1); |
3159 | btrfs_set_trans_block_group(trans, inode); | |
dbe674a9 | 3160 | btrfs_i_size_write(inode, inode->i_size); |
39279cc3 | 3161 | |
7b128766 JB |
3162 | ret = btrfs_orphan_add(trans, inode); |
3163 | if (ret) | |
3164 | goto out; | |
39279cc3 | 3165 | /* FIXME, add redo link to tree so we don't leak on crash */ |
85e21bac CM |
3166 | ret = btrfs_truncate_in_trans(trans, root, inode, |
3167 | BTRFS_EXTENT_DATA_KEY); | |
39279cc3 | 3168 | btrfs_update_inode(trans, root, inode); |
5f39d397 | 3169 | |
7b128766 JB |
3170 | ret = btrfs_orphan_del(trans, inode); |
3171 | BUG_ON(ret); | |
3172 | ||
3173 | out: | |
3174 | nr = trans->blocks_used; | |
89ce8a63 | 3175 | ret = btrfs_end_transaction_throttle(trans, root); |
39279cc3 | 3176 | BUG_ON(ret); |
d3c2fdcf | 3177 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
3178 | } |
3179 | ||
3b96362c SW |
3180 | /* |
3181 | * Invalidate a single dcache entry at the root of the filesystem. | |
3182 | * Needed after creation of snapshot or subvolume. | |
3183 | */ | |
3184 | void btrfs_invalidate_dcache_root(struct btrfs_root *root, char *name, | |
3185 | int namelen) | |
3186 | { | |
3187 | struct dentry *alias, *entry; | |
3188 | struct qstr qstr; | |
3189 | ||
3190 | alias = d_find_alias(root->fs_info->sb->s_root->d_inode); | |
3191 | if (alias) { | |
3192 | qstr.name = name; | |
3193 | qstr.len = namelen; | |
3194 | /* change me if btrfs ever gets a d_hash operation */ | |
3195 | qstr.hash = full_name_hash(qstr.name, qstr.len); | |
3196 | entry = d_lookup(alias, &qstr); | |
3197 | dput(alias); | |
3198 | if (entry) { | |
3199 | d_invalidate(entry); | |
3200 | dput(entry); | |
3201 | } | |
3202 | } | |
3203 | } | |
3204 | ||
f46b5a66 CH |
3205 | int btrfs_create_subvol_root(struct btrfs_root *new_root, |
3206 | struct btrfs_trans_handle *trans, u64 new_dirid, | |
3207 | struct btrfs_block_group_cache *block_group) | |
39279cc3 | 3208 | { |
39279cc3 | 3209 | struct inode *inode; |
00e4e6b3 | 3210 | u64 index = 0; |
39279cc3 | 3211 | |
aec7477b | 3212 | inode = btrfs_new_inode(trans, new_root, NULL, "..", 2, new_dirid, |
00e4e6b3 | 3213 | new_dirid, block_group, S_IFDIR | 0700, &index); |
54aa1f4d | 3214 | if (IS_ERR(inode)) |
f46b5a66 | 3215 | return PTR_ERR(inode); |
39279cc3 CM |
3216 | inode->i_op = &btrfs_dir_inode_operations; |
3217 | inode->i_fop = &btrfs_dir_file_operations; | |
34088780 | 3218 | new_root->inode = inode; |
39279cc3 | 3219 | |
39279cc3 | 3220 | inode->i_nlink = 1; |
dbe674a9 | 3221 | btrfs_i_size_write(inode, 0); |
3b96362c | 3222 | |
f46b5a66 | 3223 | return btrfs_update_inode(trans, new_root, inode); |
39279cc3 CM |
3224 | } |
3225 | ||
edbd8d4e | 3226 | unsigned long btrfs_force_ra(struct address_space *mapping, |
86479a04 CM |
3227 | struct file_ra_state *ra, struct file *file, |
3228 | pgoff_t offset, pgoff_t last_index) | |
3229 | { | |
8e7bf94f | 3230 | pgoff_t req_size = last_index - offset + 1; |
86479a04 CM |
3231 | |
3232 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
86479a04 CM |
3233 | offset = page_cache_readahead(mapping, ra, file, offset, req_size); |
3234 | return offset; | |
3235 | #else | |
86479a04 CM |
3236 | page_cache_sync_readahead(mapping, ra, file, offset, req_size); |
3237 | return offset + req_size; | |
3238 | #endif | |
3239 | } | |
3240 | ||
39279cc3 CM |
3241 | struct inode *btrfs_alloc_inode(struct super_block *sb) |
3242 | { | |
3243 | struct btrfs_inode *ei; | |
3244 | ||
3245 | ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS); | |
3246 | if (!ei) | |
3247 | return NULL; | |
15ee9bc7 | 3248 | ei->last_trans = 0; |
e6dcd2dc | 3249 | btrfs_ordered_inode_tree_init(&ei->ordered_tree); |
33268eaf JB |
3250 | ei->i_acl = BTRFS_ACL_NOT_CACHED; |
3251 | ei->i_default_acl = BTRFS_ACL_NOT_CACHED; | |
7b128766 | 3252 | INIT_LIST_HEAD(&ei->i_orphan); |
39279cc3 CM |
3253 | return &ei->vfs_inode; |
3254 | } | |
3255 | ||
3256 | void btrfs_destroy_inode(struct inode *inode) | |
3257 | { | |
e6dcd2dc | 3258 | struct btrfs_ordered_extent *ordered; |
39279cc3 CM |
3259 | WARN_ON(!list_empty(&inode->i_dentry)); |
3260 | WARN_ON(inode->i_data.nrpages); | |
3261 | ||
33268eaf JB |
3262 | if (BTRFS_I(inode)->i_acl && |
3263 | BTRFS_I(inode)->i_acl != BTRFS_ACL_NOT_CACHED) | |
3264 | posix_acl_release(BTRFS_I(inode)->i_acl); | |
3265 | if (BTRFS_I(inode)->i_default_acl && | |
3266 | BTRFS_I(inode)->i_default_acl != BTRFS_ACL_NOT_CACHED) | |
3267 | posix_acl_release(BTRFS_I(inode)->i_default_acl); | |
3268 | ||
bcc63abb | 3269 | spin_lock(&BTRFS_I(inode)->root->list_lock); |
7b128766 JB |
3270 | if (!list_empty(&BTRFS_I(inode)->i_orphan)) { |
3271 | printk(KERN_ERR "BTRFS: inode %lu: inode still on the orphan" | |
3272 | " list\n", inode->i_ino); | |
3273 | dump_stack(); | |
3274 | } | |
bcc63abb | 3275 | spin_unlock(&BTRFS_I(inode)->root->list_lock); |
7b128766 | 3276 | |
e6dcd2dc CM |
3277 | while(1) { |
3278 | ordered = btrfs_lookup_first_ordered_extent(inode, (u64)-1); | |
3279 | if (!ordered) | |
3280 | break; | |
3281 | else { | |
3282 | printk("found ordered extent %Lu %Lu\n", | |
3283 | ordered->file_offset, ordered->len); | |
3284 | btrfs_remove_ordered_extent(inode, ordered); | |
3285 | btrfs_put_ordered_extent(ordered); | |
3286 | btrfs_put_ordered_extent(ordered); | |
3287 | } | |
3288 | } | |
8c416c9e | 3289 | btrfs_drop_extent_cache(inode, 0, (u64)-1); |
39279cc3 CM |
3290 | kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode)); |
3291 | } | |
3292 | ||
0ee0fda0 SW |
3293 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26) |
3294 | static void init_once(void *foo) | |
3295 | #elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) | |
44ec0b71 CM |
3296 | static void init_once(struct kmem_cache * cachep, void *foo) |
3297 | #else | |
39279cc3 CM |
3298 | static void init_once(void * foo, struct kmem_cache * cachep, |
3299 | unsigned long flags) | |
44ec0b71 | 3300 | #endif |
39279cc3 CM |
3301 | { |
3302 | struct btrfs_inode *ei = (struct btrfs_inode *) foo; | |
3303 | ||
3304 | inode_init_once(&ei->vfs_inode); | |
3305 | } | |
3306 | ||
3307 | void btrfs_destroy_cachep(void) | |
3308 | { | |
3309 | if (btrfs_inode_cachep) | |
3310 | kmem_cache_destroy(btrfs_inode_cachep); | |
3311 | if (btrfs_trans_handle_cachep) | |
3312 | kmem_cache_destroy(btrfs_trans_handle_cachep); | |
3313 | if (btrfs_transaction_cachep) | |
3314 | kmem_cache_destroy(btrfs_transaction_cachep); | |
3315 | if (btrfs_bit_radix_cachep) | |
3316 | kmem_cache_destroy(btrfs_bit_radix_cachep); | |
3317 | if (btrfs_path_cachep) | |
3318 | kmem_cache_destroy(btrfs_path_cachep); | |
3319 | } | |
3320 | ||
86479a04 | 3321 | struct kmem_cache *btrfs_cache_create(const char *name, size_t size, |
92fee66d | 3322 | unsigned long extra_flags, |
0ee0fda0 SW |
3323 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26) |
3324 | void (*ctor)(void *) | |
3325 | #elif LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23) | |
44ec0b71 CM |
3326 | void (*ctor)(struct kmem_cache *, void *) |
3327 | #else | |
92fee66d | 3328 | void (*ctor)(void *, struct kmem_cache *, |
44ec0b71 CM |
3329 | unsigned long) |
3330 | #endif | |
3331 | ) | |
92fee66d CM |
3332 | { |
3333 | return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT | | |
3334 | SLAB_MEM_SPREAD | extra_flags), ctor | |
3335 | #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23) | |
3336 | ,NULL | |
3337 | #endif | |
3338 | ); | |
3339 | } | |
3340 | ||
39279cc3 CM |
3341 | int btrfs_init_cachep(void) |
3342 | { | |
86479a04 | 3343 | btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache", |
92fee66d CM |
3344 | sizeof(struct btrfs_inode), |
3345 | 0, init_once); | |
39279cc3 CM |
3346 | if (!btrfs_inode_cachep) |
3347 | goto fail; | |
86479a04 CM |
3348 | btrfs_trans_handle_cachep = |
3349 | btrfs_cache_create("btrfs_trans_handle_cache", | |
3350 | sizeof(struct btrfs_trans_handle), | |
3351 | 0, NULL); | |
39279cc3 CM |
3352 | if (!btrfs_trans_handle_cachep) |
3353 | goto fail; | |
86479a04 | 3354 | btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache", |
39279cc3 | 3355 | sizeof(struct btrfs_transaction), |
92fee66d | 3356 | 0, NULL); |
39279cc3 CM |
3357 | if (!btrfs_transaction_cachep) |
3358 | goto fail; | |
86479a04 | 3359 | btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache", |
23223584 | 3360 | sizeof(struct btrfs_path), |
92fee66d | 3361 | 0, NULL); |
39279cc3 CM |
3362 | if (!btrfs_path_cachep) |
3363 | goto fail; | |
86479a04 | 3364 | btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256, |
92fee66d | 3365 | SLAB_DESTROY_BY_RCU, NULL); |
39279cc3 CM |
3366 | if (!btrfs_bit_radix_cachep) |
3367 | goto fail; | |
3368 | return 0; | |
3369 | fail: | |
3370 | btrfs_destroy_cachep(); | |
3371 | return -ENOMEM; | |
3372 | } | |
3373 | ||
3374 | static int btrfs_getattr(struct vfsmount *mnt, | |
3375 | struct dentry *dentry, struct kstat *stat) | |
3376 | { | |
3377 | struct inode *inode = dentry->d_inode; | |
3378 | generic_fillattr(inode, stat); | |
d6667462 | 3379 | stat->blksize = PAGE_CACHE_SIZE; |
9069218d | 3380 | stat->blocks = inode->i_blocks + (BTRFS_I(inode)->delalloc_bytes >> 9); |
39279cc3 CM |
3381 | return 0; |
3382 | } | |
3383 | ||
3384 | static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry, | |
3385 | struct inode * new_dir,struct dentry *new_dentry) | |
3386 | { | |
3387 | struct btrfs_trans_handle *trans; | |
3388 | struct btrfs_root *root = BTRFS_I(old_dir)->root; | |
3389 | struct inode *new_inode = new_dentry->d_inode; | |
3390 | struct inode *old_inode = old_dentry->d_inode; | |
3391 | struct timespec ctime = CURRENT_TIME; | |
00e4e6b3 | 3392 | u64 index = 0; |
39279cc3 CM |
3393 | int ret; |
3394 | ||
3395 | if (S_ISDIR(old_inode->i_mode) && new_inode && | |
3396 | new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) { | |
3397 | return -ENOTEMPTY; | |
3398 | } | |
5f39d397 | 3399 | |
1832a6d5 CM |
3400 | ret = btrfs_check_free_space(root, 1, 0); |
3401 | if (ret) | |
3402 | goto out_unlock; | |
3403 | ||
39279cc3 | 3404 | trans = btrfs_start_transaction(root, 1); |
5f39d397 | 3405 | |
39279cc3 | 3406 | btrfs_set_trans_block_group(trans, new_dir); |
39279cc3 CM |
3407 | |
3408 | old_dentry->d_inode->i_nlink++; | |
3409 | old_dir->i_ctime = old_dir->i_mtime = ctime; | |
3410 | new_dir->i_ctime = new_dir->i_mtime = ctime; | |
3411 | old_inode->i_ctime = ctime; | |
5f39d397 | 3412 | |
39279cc3 CM |
3413 | ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry); |
3414 | if (ret) | |
3415 | goto out_fail; | |
3416 | ||
3417 | if (new_inode) { | |
3418 | new_inode->i_ctime = CURRENT_TIME; | |
3419 | ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry); | |
3420 | if (ret) | |
3421 | goto out_fail; | |
7b128766 JB |
3422 | if (new_inode->i_nlink == 0) { |
3423 | ret = btrfs_orphan_add(trans, new_inode); | |
3424 | if (ret) | |
3425 | goto out_fail; | |
3426 | } | |
39279cc3 | 3427 | } |
00e4e6b3 | 3428 | ret = btrfs_set_inode_index(new_dir, old_inode, &index); |
aec7477b JB |
3429 | if (ret) |
3430 | goto out_fail; | |
3431 | ||
00e4e6b3 | 3432 | ret = btrfs_add_link(trans, new_dentry, old_inode, 1, index); |
39279cc3 CM |
3433 | if (ret) |
3434 | goto out_fail; | |
3435 | ||
3436 | out_fail: | |
ab78c84d | 3437 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 3438 | out_unlock: |
39279cc3 CM |
3439 | return ret; |
3440 | } | |
3441 | ||
ea8c2819 CM |
3442 | int btrfs_start_delalloc_inodes(struct btrfs_root *root) |
3443 | { | |
3444 | struct list_head *head = &root->fs_info->delalloc_inodes; | |
3445 | struct btrfs_inode *binode; | |
3446 | unsigned long flags; | |
3447 | ||
3448 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
3449 | while(!list_empty(head)) { | |
3450 | binode = list_entry(head->next, struct btrfs_inode, | |
3451 | delalloc_inodes); | |
3452 | atomic_inc(&binode->vfs_inode.i_count); | |
3453 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); | |
3454 | filemap_write_and_wait(binode->vfs_inode.i_mapping); | |
3455 | iput(&binode->vfs_inode); | |
3456 | spin_lock_irqsave(&root->fs_info->delalloc_lock, flags); | |
3457 | } | |
3458 | spin_unlock_irqrestore(&root->fs_info->delalloc_lock, flags); | |
3459 | return 0; | |
3460 | } | |
3461 | ||
39279cc3 CM |
3462 | static int btrfs_symlink(struct inode *dir, struct dentry *dentry, |
3463 | const char *symname) | |
3464 | { | |
3465 | struct btrfs_trans_handle *trans; | |
3466 | struct btrfs_root *root = BTRFS_I(dir)->root; | |
3467 | struct btrfs_path *path; | |
3468 | struct btrfs_key key; | |
1832a6d5 | 3469 | struct inode *inode = NULL; |
39279cc3 CM |
3470 | int err; |
3471 | int drop_inode = 0; | |
3472 | u64 objectid; | |
00e4e6b3 | 3473 | u64 index = 0 ; |
39279cc3 CM |
3474 | int name_len; |
3475 | int datasize; | |
5f39d397 | 3476 | unsigned long ptr; |
39279cc3 | 3477 | struct btrfs_file_extent_item *ei; |
5f39d397 | 3478 | struct extent_buffer *leaf; |
1832a6d5 | 3479 | unsigned long nr = 0; |
39279cc3 CM |
3480 | |
3481 | name_len = strlen(symname) + 1; | |
3482 | if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root)) | |
3483 | return -ENAMETOOLONG; | |
1832a6d5 | 3484 | |
1832a6d5 CM |
3485 | err = btrfs_check_free_space(root, 1, 0); |
3486 | if (err) | |
3487 | goto out_fail; | |
3488 | ||
39279cc3 CM |
3489 | trans = btrfs_start_transaction(root, 1); |
3490 | btrfs_set_trans_block_group(trans, dir); | |
3491 | ||
3492 | err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid); | |
3493 | if (err) { | |
3494 | err = -ENOSPC; | |
3495 | goto out_unlock; | |
3496 | } | |
3497 | ||
aec7477b | 3498 | inode = btrfs_new_inode(trans, root, dir, dentry->d_name.name, |
9c58309d CM |
3499 | dentry->d_name.len, |
3500 | dentry->d_parent->d_inode->i_ino, objectid, | |
00e4e6b3 CM |
3501 | BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO, |
3502 | &index); | |
39279cc3 CM |
3503 | err = PTR_ERR(inode); |
3504 | if (IS_ERR(inode)) | |
3505 | goto out_unlock; | |
3506 | ||
33268eaf JB |
3507 | err = btrfs_init_acl(inode, dir); |
3508 | if (err) { | |
3509 | drop_inode = 1; | |
3510 | goto out_unlock; | |
3511 | } | |
3512 | ||
39279cc3 | 3513 | btrfs_set_trans_block_group(trans, inode); |
00e4e6b3 | 3514 | err = btrfs_add_nondir(trans, dentry, inode, 0, index); |
39279cc3 CM |
3515 | if (err) |
3516 | drop_inode = 1; | |
3517 | else { | |
3518 | inode->i_mapping->a_ops = &btrfs_aops; | |
04160088 | 3519 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
39279cc3 CM |
3520 | inode->i_fop = &btrfs_file_operations; |
3521 | inode->i_op = &btrfs_file_inode_operations; | |
d1310b2e CM |
3522 | extent_map_tree_init(&BTRFS_I(inode)->extent_tree, GFP_NOFS); |
3523 | extent_io_tree_init(&BTRFS_I(inode)->io_tree, | |
a52d9a80 | 3524 | inode->i_mapping, GFP_NOFS); |
7e38326f CM |
3525 | extent_io_tree_init(&BTRFS_I(inode)->io_failure_tree, |
3526 | inode->i_mapping, GFP_NOFS); | |
ea8c2819 | 3527 | INIT_LIST_HEAD(&BTRFS_I(inode)->delalloc_inodes); |
1b1e2135 | 3528 | mutex_init(&BTRFS_I(inode)->csum_mutex); |
ee6e6504 | 3529 | mutex_init(&BTRFS_I(inode)->extent_mutex); |
9069218d | 3530 | BTRFS_I(inode)->delalloc_bytes = 0; |
dbe674a9 | 3531 | BTRFS_I(inode)->disk_i_size = 0; |
db69e0eb | 3532 | inode->i_mapping->writeback_index = 0; |
d1310b2e | 3533 | BTRFS_I(inode)->io_tree.ops = &btrfs_extent_io_ops; |
ba1da2f4 | 3534 | btrfs_ordered_inode_tree_init(&BTRFS_I(inode)->ordered_tree); |
39279cc3 CM |
3535 | } |
3536 | dir->i_sb->s_dirt = 1; | |
3537 | btrfs_update_inode_block_group(trans, inode); | |
3538 | btrfs_update_inode_block_group(trans, dir); | |
3539 | if (drop_inode) | |
3540 | goto out_unlock; | |
3541 | ||
3542 | path = btrfs_alloc_path(); | |
3543 | BUG_ON(!path); | |
3544 | key.objectid = inode->i_ino; | |
3545 | key.offset = 0; | |
39279cc3 CM |
3546 | btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY); |
3547 | datasize = btrfs_file_extent_calc_inline_size(name_len); | |
3548 | err = btrfs_insert_empty_item(trans, root, path, &key, | |
3549 | datasize); | |
54aa1f4d CM |
3550 | if (err) { |
3551 | drop_inode = 1; | |
3552 | goto out_unlock; | |
3553 | } | |
5f39d397 CM |
3554 | leaf = path->nodes[0]; |
3555 | ei = btrfs_item_ptr(leaf, path->slots[0], | |
3556 | struct btrfs_file_extent_item); | |
3557 | btrfs_set_file_extent_generation(leaf, ei, trans->transid); | |
3558 | btrfs_set_file_extent_type(leaf, ei, | |
39279cc3 CM |
3559 | BTRFS_FILE_EXTENT_INLINE); |
3560 | ptr = btrfs_file_extent_inline_start(ei); | |
5f39d397 CM |
3561 | write_extent_buffer(leaf, symname, ptr, name_len); |
3562 | btrfs_mark_buffer_dirty(leaf); | |
39279cc3 | 3563 | btrfs_free_path(path); |
5f39d397 | 3564 | |
39279cc3 CM |
3565 | inode->i_op = &btrfs_symlink_inode_operations; |
3566 | inode->i_mapping->a_ops = &btrfs_symlink_aops; | |
04160088 | 3567 | inode->i_mapping->backing_dev_info = &root->fs_info->bdi; |
dbe674a9 | 3568 | btrfs_i_size_write(inode, name_len - 1); |
54aa1f4d CM |
3569 | err = btrfs_update_inode(trans, root, inode); |
3570 | if (err) | |
3571 | drop_inode = 1; | |
39279cc3 CM |
3572 | |
3573 | out_unlock: | |
d3c2fdcf | 3574 | nr = trans->blocks_used; |
ab78c84d | 3575 | btrfs_end_transaction_throttle(trans, root); |
1832a6d5 | 3576 | out_fail: |
39279cc3 CM |
3577 | if (drop_inode) { |
3578 | inode_dec_link_count(inode); | |
3579 | iput(inode); | |
3580 | } | |
d3c2fdcf | 3581 | btrfs_btree_balance_dirty(root, nr); |
39279cc3 CM |
3582 | return err; |
3583 | } | |
16432985 | 3584 | |
e6dcd2dc CM |
3585 | static int btrfs_set_page_dirty(struct page *page) |
3586 | { | |
e6dcd2dc CM |
3587 | return __set_page_dirty_nobuffers(page); |
3588 | } | |
3589 | ||
0ee0fda0 SW |
3590 | #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,26) |
3591 | static int btrfs_permission(struct inode *inode, int mask) | |
3592 | #else | |
fdebe2bd Y |
3593 | static int btrfs_permission(struct inode *inode, int mask, |
3594 | struct nameidata *nd) | |
0ee0fda0 | 3595 | #endif |
fdebe2bd Y |
3596 | { |
3597 | if (btrfs_test_flag(inode, READONLY) && (mask & MAY_WRITE)) | |
3598 | return -EACCES; | |
33268eaf | 3599 | return generic_permission(inode, mask, btrfs_check_acl); |
fdebe2bd | 3600 | } |
39279cc3 CM |
3601 | |
3602 | static struct inode_operations btrfs_dir_inode_operations = { | |
3603 | .lookup = btrfs_lookup, | |
3604 | .create = btrfs_create, | |
3605 | .unlink = btrfs_unlink, | |
3606 | .link = btrfs_link, | |
3607 | .mkdir = btrfs_mkdir, | |
3608 | .rmdir = btrfs_rmdir, | |
3609 | .rename = btrfs_rename, | |
3610 | .symlink = btrfs_symlink, | |
3611 | .setattr = btrfs_setattr, | |
618e21d5 | 3612 | .mknod = btrfs_mknod, |
5103e947 JB |
3613 | .setxattr = generic_setxattr, |
3614 | .getxattr = generic_getxattr, | |
3615 | .listxattr = btrfs_listxattr, | |
3616 | .removexattr = generic_removexattr, | |
fdebe2bd | 3617 | .permission = btrfs_permission, |
39279cc3 | 3618 | }; |
39279cc3 CM |
3619 | static struct inode_operations btrfs_dir_ro_inode_operations = { |
3620 | .lookup = btrfs_lookup, | |
fdebe2bd | 3621 | .permission = btrfs_permission, |
39279cc3 | 3622 | }; |
39279cc3 CM |
3623 | static struct file_operations btrfs_dir_file_operations = { |
3624 | .llseek = generic_file_llseek, | |
3625 | .read = generic_read_dir, | |
3626 | .readdir = btrfs_readdir, | |
34287aa3 | 3627 | .unlocked_ioctl = btrfs_ioctl, |
39279cc3 | 3628 | #ifdef CONFIG_COMPAT |
34287aa3 | 3629 | .compat_ioctl = btrfs_ioctl, |
39279cc3 | 3630 | #endif |
6bf13c0c | 3631 | .release = btrfs_release_file, |
39279cc3 CM |
3632 | }; |
3633 | ||
d1310b2e | 3634 | static struct extent_io_ops btrfs_extent_io_ops = { |
07157aac | 3635 | .fill_delalloc = run_delalloc_range, |
065631f6 | 3636 | .submit_bio_hook = btrfs_submit_bio_hook, |
239b14b3 | 3637 | .merge_bio_hook = btrfs_merge_bio_hook, |
07157aac | 3638 | .readpage_end_io_hook = btrfs_readpage_end_io_hook, |
e6dcd2dc | 3639 | .writepage_end_io_hook = btrfs_writepage_end_io_hook, |
247e743c | 3640 | .writepage_start_hook = btrfs_writepage_start_hook, |
1259ab75 | 3641 | .readpage_io_failed_hook = btrfs_io_failed_hook, |
b0c68f8b CM |
3642 | .set_bit_hook = btrfs_set_bit_hook, |
3643 | .clear_bit_hook = btrfs_clear_bit_hook, | |
07157aac CM |
3644 | }; |
3645 | ||
39279cc3 CM |
3646 | static struct address_space_operations btrfs_aops = { |
3647 | .readpage = btrfs_readpage, | |
3648 | .writepage = btrfs_writepage, | |
b293f02e | 3649 | .writepages = btrfs_writepages, |
3ab2fb5a | 3650 | .readpages = btrfs_readpages, |
39279cc3 | 3651 | .sync_page = block_sync_page, |
39279cc3 | 3652 | .bmap = btrfs_bmap, |
16432985 | 3653 | .direct_IO = btrfs_direct_IO, |
a52d9a80 CM |
3654 | .invalidatepage = btrfs_invalidatepage, |
3655 | .releasepage = btrfs_releasepage, | |
e6dcd2dc | 3656 | .set_page_dirty = btrfs_set_page_dirty, |
39279cc3 CM |
3657 | }; |
3658 | ||
3659 | static struct address_space_operations btrfs_symlink_aops = { | |
3660 | .readpage = btrfs_readpage, | |
3661 | .writepage = btrfs_writepage, | |
2bf5a725 CM |
3662 | .invalidatepage = btrfs_invalidatepage, |
3663 | .releasepage = btrfs_releasepage, | |
39279cc3 CM |
3664 | }; |
3665 | ||
3666 | static struct inode_operations btrfs_file_inode_operations = { | |
3667 | .truncate = btrfs_truncate, | |
3668 | .getattr = btrfs_getattr, | |
3669 | .setattr = btrfs_setattr, | |
5103e947 JB |
3670 | .setxattr = generic_setxattr, |
3671 | .getxattr = generic_getxattr, | |
3672 | .listxattr = btrfs_listxattr, | |
3673 | .removexattr = generic_removexattr, | |
fdebe2bd | 3674 | .permission = btrfs_permission, |
39279cc3 | 3675 | }; |
618e21d5 JB |
3676 | static struct inode_operations btrfs_special_inode_operations = { |
3677 | .getattr = btrfs_getattr, | |
3678 | .setattr = btrfs_setattr, | |
fdebe2bd | 3679 | .permission = btrfs_permission, |
33268eaf JB |
3680 | .setxattr = generic_setxattr, |
3681 | .getxattr = generic_getxattr, | |
3682 | .listxattr = btrfs_listxattr, | |
3683 | .removexattr = generic_removexattr, | |
618e21d5 | 3684 | }; |
39279cc3 CM |
3685 | static struct inode_operations btrfs_symlink_inode_operations = { |
3686 | .readlink = generic_readlink, | |
3687 | .follow_link = page_follow_link_light, | |
3688 | .put_link = page_put_link, | |
fdebe2bd | 3689 | .permission = btrfs_permission, |
39279cc3 | 3690 | }; |