projects / linux-2.6-block.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
fix found_type decrement in btrfs_truncate_in_trans
[linux-2.6-block.git] / fs / btrfs / inode.c
CommitLineData
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
39279cc3
CM		 19#include <linux/buffer_head.h>
20#include <linux/fs.h>
21#include <linux/pagemap.h>
22#include <linux/highmem.h>
23#include <linux/time.h>
24#include <linux/init.h>
25#include <linux/string.h>
26#include <linux/smp_lock.h>
27#include <linux/backing-dev.h>
28#include <linux/mpage.h>
29#include <linux/swap.h>
30#include <linux/writeback.h>
31#include <linux/statfs.h>
32#include <linux/compat.h>
9ebefb18 33#include <linux/bit_spinlock.h>
92fee66d 34#include <linux/version.h>
39279cc3
CM		 35#include "ctree.h"
36#include "disk-io.h"
37#include "transaction.h"
38#include "btrfs_inode.h"
39#include "ioctl.h"
40#include "print-tree.h"
41
42struct btrfs_iget_args {
43 u64 ino;
44 struct btrfs_root *root;
45};
46
47static struct inode_operations btrfs_dir_inode_operations;
48static struct inode_operations btrfs_symlink_inode_operations;
49static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 50static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 51static struct inode_operations btrfs_file_inode_operations;
52static struct address_space_operations btrfs_aops;
53static struct address_space_operations btrfs_symlink_aops;
54static struct file_operations btrfs_dir_file_operations;
07157aac 55static struct extent_map_ops btrfs_extent_map_ops;
39279cc3
CM		 56
57static struct kmem_cache *btrfs_inode_cachep;
58struct kmem_cache *btrfs_trans_handle_cachep;
59struct kmem_cache *btrfs_transaction_cachep;
60struct kmem_cache *btrfs_bit_radix_cachep;
61struct kmem_cache *btrfs_path_cachep;
62
63#define S_SHIFT 12
64static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
65 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
66 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
67 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
68 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
69 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
70 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
71 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
72};
73
b888db2b
CM		 74static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
75{
76 struct btrfs_root *root = BTRFS_I(inode)->root;
77 struct btrfs_trans_handle *trans;
78 struct btrfs_key ins;
79 u64 alloc_hint = 0;
80 u64 num_blocks;
81 int ret;
82 u64 blocksize = 1 << inode->i_blkbits;
83
84 mutex_lock(&root->fs_info->fs_mutex);
85 trans = btrfs_start_transaction(root, 1);
86 btrfs_set_trans_block_group(trans, inode);
87 BUG_ON(!trans);
88 num_blocks = (end - start + blocksize) & ~(blocksize - 1);
89 ret = btrfs_drop_extents(trans, root, inode,
90 start, start + num_blocks, &alloc_hint);
91 num_blocks = num_blocks >> inode->i_blkbits;
92 ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_blocks, 0,
93 alloc_hint, (u64)-1, &ins, 1);
94 if (ret) {
95 WARN_ON(1);
96 goto out;
97 }
98 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
99 start, ins.objectid, ins.offset,
100 ins.offset);
101out:
102 btrfs_end_transaction(trans, root);
103 mutex_unlock(&root->fs_info->fs_mutex);
104 return ret;
105}
106
07157aac
CM		 107int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
108{
109 struct inode *inode = page->mapping->host;
110 struct btrfs_root *root = BTRFS_I(inode)->root;
111 struct btrfs_trans_handle *trans;
112 char *kaddr;
113 int ret;
114 u64 page_start = page->index << PAGE_CACHE_SHIFT;
115 size_t offset = start - page_start;
116
117 mutex_lock(&root->fs_info->fs_mutex);
118 trans = btrfs_start_transaction(root, 1);
119 btrfs_set_trans_block_group(trans, inode);
120 kaddr = kmap(page);
121 btrfs_csum_file_block(trans, root, inode->i_ino,
122 start, kaddr + offset, end - start + 1);
123 kunmap(page);
124 ret = btrfs_end_transaction(trans, root);
125 BUG_ON(ret);
126 mutex_unlock(&root->fs_info->fs_mutex);
127 return ret;
128}
129
130int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
131{
132 int ret = 0;
133 struct inode *inode = page->mapping->host;
134 struct btrfs_root *root = BTRFS_I(inode)->root;
135 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
136 struct btrfs_csum_item *item;
137 struct btrfs_path *path = NULL;
138 u64 private;
139
140 mutex_lock(&root->fs_info->fs_mutex);
141 path = btrfs_alloc_path();
142 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
143 if (IS_ERR(item)) {
144 ret = PTR_ERR(item);
145 /* a csum that isn't present is a preallocated region. */
146 if (ret == -ENOENT || ret == -EFBIG)
147 ret = 0;
148 private = 0;
149 goto out;
150 }
151 memcpy((char *)&private, &item->csum, BTRFS_CRC32_SIZE);
152 set_state_private(em_tree, start, private);
153out:
154 if (path)
155 btrfs_free_path(path);
156 mutex_unlock(&root->fs_info->fs_mutex);
157 return ret;
158}
159
160int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
161{
162 char csum[BTRFS_CRC32_SIZE];
163 size_t offset = start - (page->index << PAGE_CACHE_SHIFT);
164 struct inode *inode = page->mapping->host;
165 struct btrfs_root *root = BTRFS_I(inode)->root;
166 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
167 char *kaddr;
168 u64 private;
169 int ret;
170
171 ret = get_state_private(em_tree, start, &private);
172 kaddr = kmap_atomic(page, KM_IRQ0);
173 if (ret) {
174 goto zeroit;
175 }
176 ret = btrfs_csum_data(root, kaddr + offset, end - start + 1, csum);
177 BUG_ON(ret);
178 if (memcmp(csum, &private, BTRFS_CRC32_SIZE)) {
179 goto zeroit;
180 }
181 kunmap_atomic(kaddr, KM_IRQ0);
182 return 0;
183
184zeroit:
185 printk("btrfs csum failed ino %lu off %llu\n",
186 page->mapping->host->i_ino, (unsigned long long)start);
187 memset(kaddr + offset, 1, end - start + 1); flush_dcache_page(page);
188 kunmap_atomic(kaddr, KM_IRQ0);
189 return 0;
190}
b888db2b 191
39279cc3
CM		 192void btrfs_read_locked_inode(struct inode *inode)
193{
194 struct btrfs_path *path;
195 struct btrfs_inode_item *inode_item;
196 struct btrfs_root *root = BTRFS_I(inode)->root;
197 struct btrfs_key location;
198 u64 alloc_group_block;
618e21d5 199 u32 rdev;
39279cc3
CM		 200 int ret;
201
202 path = btrfs_alloc_path();
203 BUG_ON(!path);
39279cc3
CM		 204 mutex_lock(&root->fs_info->fs_mutex);
205
206 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
207 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
208 if (ret) {
209 btrfs_free_path(path);
210 goto make_bad;
211 }
212 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
213 path->slots[0],
214 struct btrfs_inode_item);
215
216 inode->i_mode = btrfs_inode_mode(inode_item);
217 inode->i_nlink = btrfs_inode_nlink(inode_item);
218 inode->i_uid = btrfs_inode_uid(inode_item);
219 inode->i_gid = btrfs_inode_gid(inode_item);
220 inode->i_size = btrfs_inode_size(inode_item);
221 inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
222 inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
223 inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
224 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
225 inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
226 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
227 inode->i_blocks = btrfs_inode_nblocks(inode_item);
228 inode->i_generation = btrfs_inode_generation(inode_item);
618e21d5
JB		 229 inode->i_rdev = 0;
230 rdev = btrfs_inode_rdev(inode_item);
39279cc3
CM		 231 alloc_group_block = btrfs_inode_block_group(inode_item);
232 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
233 alloc_group_block);
234
235 btrfs_free_path(path);
236 inode_item = NULL;
237
238 mutex_unlock(&root->fs_info->fs_mutex);
239
240 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 241 case S_IFREG:
242 inode->i_mapping->a_ops = &btrfs_aops;
07157aac 243 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 244 inode->i_fop = &btrfs_file_operations;
245 inode->i_op = &btrfs_file_inode_operations;
246 break;
247 case S_IFDIR:
248 inode->i_fop = &btrfs_dir_file_operations;
249 if (root == root->fs_info->tree_root)
250 inode->i_op = &btrfs_dir_ro_inode_operations;
251 else
252 inode->i_op = &btrfs_dir_inode_operations;
253 break;
254 case S_IFLNK:
255 inode->i_op = &btrfs_symlink_inode_operations;
256 inode->i_mapping->a_ops = &btrfs_symlink_aops;
257 break;
618e21d5
JB		 258 default:
259 init_special_inode(inode, inode->i_mode, rdev);
260 break;
39279cc3
CM		 261 }
262 return;
263
264make_bad:
265 btrfs_release_path(root, path);
266 btrfs_free_path(path);
267 mutex_unlock(&root->fs_info->fs_mutex);
268 make_bad_inode(inode);
269}
270
271static void fill_inode_item(struct btrfs_inode_item *item,
272 struct inode *inode)
273{
274 btrfs_set_inode_uid(item, inode->i_uid);
275 btrfs_set_inode_gid(item, inode->i_gid);
276 btrfs_set_inode_size(item, inode->i_size);
277 btrfs_set_inode_mode(item, inode->i_mode);
278 btrfs_set_inode_nlink(item, inode->i_nlink);
279 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
280 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
281 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
282 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
283 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
284 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
285 btrfs_set_inode_nblocks(item, inode->i_blocks);
286 btrfs_set_inode_generation(item, inode->i_generation);
618e21d5 287 btrfs_set_inode_rdev(item, inode->i_rdev);
39279cc3
CM		 288 btrfs_set_inode_block_group(item,
289 BTRFS_I(inode)->block_group->key.objectid);
290}
291
a52d9a80 292int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 293 struct btrfs_root *root,
294 struct inode *inode)
295{
296 struct btrfs_inode_item *inode_item;
297 struct btrfs_path *path;
298 int ret;
299
300 path = btrfs_alloc_path();
301 BUG_ON(!path);
39279cc3
CM		 302 ret = btrfs_lookup_inode(trans, root, path,
303 &BTRFS_I(inode)->location, 1);
304 if (ret) {
305 if (ret > 0)
306 ret = -ENOENT;
307 goto failed;
308 }
309
310 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
311 path->slots[0],
312 struct btrfs_inode_item);
313
314 fill_inode_item(inode_item, inode);
315 btrfs_mark_buffer_dirty(path->nodes[0]);
15ee9bc7 316 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 317 ret = 0;
318failed:
319 btrfs_release_path(root, path);
320 btrfs_free_path(path);
321 return ret;
322}
323
324
325static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
326 struct btrfs_root *root,
327 struct inode *dir,
328 struct dentry *dentry)
329{
330 struct btrfs_path *path;
331 const char *name = dentry->d_name.name;
332 int name_len = dentry->d_name.len;
333 int ret = 0;
334 u64 objectid;
335 struct btrfs_dir_item *di;
336
337 path = btrfs_alloc_path();
54aa1f4d
CM		 338 if (!path) {
339 ret = -ENOMEM;
340 goto err;
341 }
342
39279cc3
CM		 343 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
344 name, name_len, -1);
345 if (IS_ERR(di)) {
346 ret = PTR_ERR(di);
347 goto err;
348 }
349 if (!di) {
350 ret = -ENOENT;
351 goto err;
352 }
353 objectid = btrfs_disk_key_objectid(&di->location);
354 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 355 if (ret)
356 goto err;
39279cc3
CM		 357 btrfs_release_path(root, path);
358
359 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
360 objectid, name, name_len, -1);
361 if (IS_ERR(di)) {
362 ret = PTR_ERR(di);
363 goto err;
364 }
365 if (!di) {
366 ret = -ENOENT;
367 goto err;
368 }
369 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 370
371 dentry->d_inode->i_ctime = dir->i_ctime;
372err:
373 btrfs_free_path(path);
374 if (!ret) {
375 dir->i_size -= name_len * 2;
79c44584 376 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3
CM		 377 btrfs_update_inode(trans, root, dir);
378 drop_nlink(dentry->d_inode);
54aa1f4d 379 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 380 dir->i_sb->s_dirt = 1;
381 }
382 return ret;
383}
384
385static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
386{
387 struct btrfs_root *root;
388 struct btrfs_trans_handle *trans;
389 int ret;
d3c2fdcf 390 unsigned long nr;
39279cc3
CM		 391
392 root = BTRFS_I(dir)->root;
393 mutex_lock(&root->fs_info->fs_mutex);
394 trans = btrfs_start_transaction(root, 1);
395 btrfs_set_trans_block_group(trans, dir);
396 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 397 nr = trans->blocks_used;
39279cc3
CM		 398 btrfs_end_transaction(trans, root);
399 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 400 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 401 return ret;
402}
403
404static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
405{
406 struct inode *inode = dentry->d_inode;
407 int err;
408 int ret;
409 struct btrfs_root *root = BTRFS_I(dir)->root;
410 struct btrfs_path *path;
411 struct btrfs_key key;
412 struct btrfs_trans_handle *trans;
413 struct btrfs_key found_key;
414 int found_type;
415 struct btrfs_leaf *leaf;
416 char *goodnames = "..";
d3c2fdcf 417 unsigned long nr;
39279cc3
CM		 418
419 path = btrfs_alloc_path();
420 BUG_ON(!path);
39279cc3
CM		 421 mutex_lock(&root->fs_info->fs_mutex);
422 trans = btrfs_start_transaction(root, 1);
423 btrfs_set_trans_block_group(trans, dir);
424 key.objectid = inode->i_ino;
425 key.offset = (u64)-1;
426 key.flags = (u32)-1;
427 while(1) {
428 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
429 if (ret < 0) {
430 err = ret;
431 goto out;
432 }
433 BUG_ON(ret == 0);
434 if (path->slots[0] == 0) {
435 err = -ENOENT;
436 goto out;
437 }
438 path->slots[0]--;
439 leaf = btrfs_buffer_leaf(path->nodes[0]);
440 btrfs_disk_key_to_cpu(&found_key,
441 &leaf->items[path->slots[0]].key);
442 found_type = btrfs_key_type(&found_key);
443 if (found_key.objectid != inode->i_ino) {
444 err = -ENOENT;
445 goto out;
446 }
447 if ((found_type != BTRFS_DIR_ITEM_KEY &&
448 found_type != BTRFS_DIR_INDEX_KEY) ||
449 (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
450 !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
451 err = -ENOTEMPTY;
452 goto out;
453 }
454 ret = btrfs_del_item(trans, root, path);
455 BUG_ON(ret);
456
457 if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
458 break;
459 btrfs_release_path(root, path);
460 }
461 ret = 0;
462 btrfs_release_path(root, path);
463
464 /* now the directory is empty */
465 err = btrfs_unlink_trans(trans, root, dir, dentry);
466 if (!err) {
467 inode->i_size = 0;
468 }
469out:
470 btrfs_release_path(root, path);
471 btrfs_free_path(path);
472 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 473 nr = trans->blocks_used;
39279cc3 474 ret = btrfs_end_transaction(trans, root);
d3c2fdcf 475 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 476 if (ret && !err)
477 err = ret;
478 return err;
479}
480
481static int btrfs_free_inode(struct btrfs_trans_handle *trans,
482 struct btrfs_root *root,
483 struct inode *inode)
484{
485 struct btrfs_path *path;
486 int ret;
487
488 clear_inode(inode);
489
490 path = btrfs_alloc_path();
491 BUG_ON(!path);
39279cc3
CM		 492 ret = btrfs_lookup_inode(trans, root, path,
493 &BTRFS_I(inode)->location, -1);
54aa1f4d
CM		 494 if (ret > 0)
495 ret = -ENOENT;
496 if (!ret)
497 ret = btrfs_del_item(trans, root, path);
39279cc3
CM		 498 btrfs_free_path(path);
499 return ret;
500}
501
39279cc3
CM		 502/*
503 * this can truncate away extent items, csum items and directory items.
504 * It starts at a high offset and removes keys until it can't find
505 * any higher than i_size.
506 *
507 * csum items that cross the new i_size are truncated to the new size
508 * as well.
509 */
510static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
511 struct btrfs_root *root,
512 struct inode *inode)
513{
514 int ret;
515 struct btrfs_path *path;
516 struct btrfs_key key;
517 struct btrfs_disk_key *found_key;
518 u32 found_type;
519 struct btrfs_leaf *leaf;
520 struct btrfs_file_extent_item *fi;
521 u64 extent_start = 0;
522 u64 extent_num_blocks = 0;
523 u64 item_end = 0;
524 int found_extent;
525 int del_item;
526
a52d9a80 527 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 528 path = btrfs_alloc_path();
3c69faec 529 path->reada = -1;
39279cc3
CM		 530 BUG_ON(!path);
531 /* FIXME, add redo link to tree so we don't leak on crash */
532 key.objectid = inode->i_ino;
533 key.offset = (u64)-1;
534 key.flags = (u32)-1;
535 while(1) {
536 btrfs_init_path(path);
537 fi = NULL;
538 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
539 if (ret < 0) {
540 goto error;
541 }
542 if (ret > 0) {
543 BUG_ON(path->slots[0] == 0);
544 path->slots[0]--;
545 }
39279cc3
CM		 546 leaf = btrfs_buffer_leaf(path->nodes[0]);
547 found_key = &leaf->items[path->slots[0]].key;
548 found_type = btrfs_disk_key_type(found_key);
549
550 if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
551 break;
552 if (found_type != BTRFS_CSUM_ITEM_KEY &&
553 found_type != BTRFS_DIR_ITEM_KEY &&
554 found_type != BTRFS_DIR_INDEX_KEY &&
555 found_type != BTRFS_EXTENT_DATA_KEY)
556 break;
557
558 item_end = btrfs_disk_key_offset(found_key);
559 if (found_type == BTRFS_EXTENT_DATA_KEY) {
560 fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
561 path->slots[0],
562 struct btrfs_file_extent_item);
563 if (btrfs_file_extent_type(fi) !=
564 BTRFS_FILE_EXTENT_INLINE) {
565 item_end += btrfs_file_extent_num_blocks(fi) <<
566 inode->i_blkbits;
567 }
568 }
569 if (found_type == BTRFS_CSUM_ITEM_KEY) {
570 ret = btrfs_csum_truncate(trans, root, path,
571 inode->i_size);
572 BUG_ON(ret);
573 }
574 if (item_end < inode->i_size) {
b888db2b
CM		 575 if (found_type == BTRFS_DIR_ITEM_KEY) {
576 found_type = BTRFS_INODE_ITEM_KEY;
577 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
578 found_type = BTRFS_CSUM_ITEM_KEY;
579 } else if (found_type) {
580 found_type--;
581 } else {
582 break;
39279cc3 583 }
a61721d5 584 btrfs_set_key_type(&key, found_type);
b888db2b 585 continue;
39279cc3
CM		 586 }
587 if (btrfs_disk_key_offset(found_key) >= inode->i_size)
588 del_item = 1;
589 else
590 del_item = 0;
591 found_extent = 0;
592
593 /* FIXME, shrink the extent if the ref count is only 1 */
594 if (found_type == BTRFS_EXTENT_DATA_KEY &&
595 btrfs_file_extent_type(fi) !=
596 BTRFS_FILE_EXTENT_INLINE) {
597 u64 num_dec;
598 if (!del_item) {
599 u64 orig_num_blocks =
600 btrfs_file_extent_num_blocks(fi);
601 extent_num_blocks = inode->i_size -
602 btrfs_disk_key_offset(found_key) +
603 root->blocksize - 1;
604 extent_num_blocks >>= inode->i_blkbits;
605 btrfs_set_file_extent_num_blocks(fi,
606 extent_num_blocks);
607 inode->i_blocks -= (orig_num_blocks -
608 extent_num_blocks) << 3;
ccd467d6 609 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3
CM		 610 } else {
611 extent_start =
612 btrfs_file_extent_disk_blocknr(fi);
613 extent_num_blocks =
614 btrfs_file_extent_disk_num_blocks(fi);
615 /* FIXME blocksize != 4096 */
616 num_dec = btrfs_file_extent_num_blocks(fi) << 3;
617 if (extent_start != 0) {
618 found_extent = 1;
619 inode->i_blocks -= num_dec;
620 }
621 }
622 }
623 if (del_item) {
624 ret = btrfs_del_item(trans, root, path);
54aa1f4d
CM		 625 if (ret)
626 goto error;
39279cc3
CM		 627 } else {
628 break;
629 }
630 btrfs_release_path(root, path);
631 if (found_extent) {
632 ret = btrfs_free_extent(trans, root, extent_start,
633 extent_num_blocks, 0);
634 BUG_ON(ret);
635 }
636 }
637 ret = 0;
638error:
639 btrfs_release_path(root, path);
640 btrfs_free_path(path);
641 inode->i_sb->s_dirt = 1;
642 return ret;
643}
644
b888db2b 645static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 646 size_t zero_start)
647{
648 char *kaddr;
649 int ret = 0;
b888db2b 650 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
a52d9a80 651 u64 page_start = page->index << PAGE_CACHE_SHIFT;
b888db2b 652 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
a52d9a80
CM		 653
654 if (!PagePrivate(page)) {
655 SetPagePrivate(page);
656 set_page_private(page, 1);
b888db2b 657 WARN_ON(!page->mapping->a_ops->invalidatepage);
a52d9a80
CM		 658 page_cache_get(page);
659 }
660
b888db2b
CM		 661 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
662 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
663 page_end, GFP_NOFS);
a52d9a80 664 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 665 kaddr = kmap(page);
a52d9a80
CM		 666 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
667 flush_dcache_page(page);
b888db2b 668 kunmap(page);
a52d9a80 669 }
b888db2b
CM		 670 set_page_dirty(page);
671 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
a52d9a80 672
a52d9a80
CM		 673 return ret;
674}
675
39279cc3
CM		 676/*
677 * taken from block_truncate_page, but does cow as it zeros out
678 * any bytes left in the last page in the file.
679 */
680static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
681{
682 struct inode *inode = mapping->host;
683 unsigned blocksize = 1 << inode->i_blkbits;
684 pgoff_t index = from >> PAGE_CACHE_SHIFT;
685 unsigned offset = from & (PAGE_CACHE_SIZE-1);
686 struct page *page;
39279cc3 687 int ret = 0;
a52d9a80 688 u64 page_start;
39279cc3
CM		 689
690 if ((offset & (blocksize - 1)) == 0)
691 goto out;
692
011410bd 693 down_read(&BTRFS_I(inode)->root->snap_sem);
39279cc3
CM		 694 ret = -ENOMEM;
695 page = grab_cache_page(mapping, index);
696 if (!page)
697 goto out;
39279cc3 698 if (!PageUptodate(page)) {
9ebefb18 699 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 700 lock_page(page);
701 if (!PageUptodate(page)) {
702 ret = -EIO;
703 goto out;
704 }
705 }
a52d9a80
CM		 706 page_start = page->index << PAGE_CACHE_SHIFT;
707
b888db2b 708 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 709
39279cc3
CM		 710 unlock_page(page);
711 page_cache_release(page);
011410bd 712 up_read(&BTRFS_I(inode)->root->snap_sem);
39279cc3
CM		 713out:
714 return ret;
715}
716
717static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
718{
719 struct inode *inode = dentry->d_inode;
720 int err;
721
722 err = inode_change_ok(inode, attr);
723 if (err)
724 return err;
725
726 if (S_ISREG(inode->i_mode) &&
727 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
728 struct btrfs_trans_handle *trans;
729 struct btrfs_root *root = BTRFS_I(inode)->root;
2bf5a725
CM		 730 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
731
39279cc3
CM		 732 u64 mask = root->blocksize - 1;
733 u64 pos = (inode->i_size + mask) & ~mask;
2bf5a725 734 u64 block_end = attr->ia_size | mask;
39279cc3 735 u64 hole_size;
2bf5a725 736 u64 alloc_hint;
39279cc3
CM		 737
738 if (attr->ia_size <= pos)
739 goto out;
740
741 btrfs_truncate_page(inode->i_mapping, inode->i_size);
742
2bf5a725 743 lock_extent(em_tree, pos, block_end, GFP_NOFS);
39279cc3 744 hole_size = (attr->ia_size - pos + mask) & ~mask;
39279cc3
CM		 745
746 mutex_lock(&root->fs_info->fs_mutex);
747 trans = btrfs_start_transaction(root, 1);
748 btrfs_set_trans_block_group(trans, inode);
2bf5a725
CM		 749 err = btrfs_drop_extents(trans, root, inode,
750 pos, pos + hole_size, &alloc_hint);
751
752 hole_size >>= inode->i_blkbits;
753
39279cc3
CM		 754 err = btrfs_insert_file_extent(trans, root, inode->i_ino,
755 pos, 0, 0, hole_size);
39279cc3
CM		 756 btrfs_end_transaction(trans, root);
757 mutex_unlock(&root->fs_info->fs_mutex);
2bf5a725 758 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
54aa1f4d
CM		 759 if (err)
760 return err;
39279cc3
CM		 761 }
762out:
763 err = inode_setattr(inode, attr);
764
765 return err;
766}
767void btrfs_delete_inode(struct inode *inode)
768{
769 struct btrfs_trans_handle *trans;
770 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 771 unsigned long nr;
39279cc3
CM		 772 int ret;
773
774 truncate_inode_pages(&inode->i_data, 0);
775 if (is_bad_inode(inode)) {
776 goto no_delete;
777 }
778 inode->i_size = 0;
779 mutex_lock(&root->fs_info->fs_mutex);
780 trans = btrfs_start_transaction(root, 1);
781 btrfs_set_trans_block_group(trans, inode);
782 ret = btrfs_truncate_in_trans(trans, root, inode);
54aa1f4d
CM		 783 if (ret)
784 goto no_delete_lock;
785 ret = btrfs_free_inode(trans, root, inode);
786 if (ret)
787 goto no_delete_lock;
d3c2fdcf 788 nr = trans->blocks_used;
39279cc3
CM		 789 btrfs_end_transaction(trans, root);
790 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 791 btrfs_btree_balance_dirty(root, nr);
39279cc3 792 return;
54aa1f4d
CM		 793
794no_delete_lock:
d3c2fdcf 795 nr = trans->blocks_used;
54aa1f4d
CM		 796 btrfs_end_transaction(trans, root);
797 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 798 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 799no_delete:
800 clear_inode(inode);
801}
802
803/*
804 * this returns the key found in the dir entry in the location pointer.
805 * If no dir entries were found, location->objectid is 0.
806 */
807static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
808 struct btrfs_key *location)
809{
810 const char *name = dentry->d_name.name;
811 int namelen = dentry->d_name.len;
812 struct btrfs_dir_item *di;
813 struct btrfs_path *path;
814 struct btrfs_root *root = BTRFS_I(dir)->root;
815 int ret;
816
817 path = btrfs_alloc_path();
818 BUG_ON(!path);
39279cc3
CM		 819 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
820 namelen, 0);
821 if (!di || IS_ERR(di)) {
822 location->objectid = 0;
823 ret = 0;
824 goto out;
825 }
826 btrfs_disk_key_to_cpu(location, &di->location);
827out:
828 btrfs_release_path(root, path);
829 btrfs_free_path(path);
830 return ret;
831}
832
833/*
834 * when we hit a tree root in a directory, the btrfs part of the inode
835 * needs to be changed to reflect the root directory of the tree root. This
836 * is kind of like crossing a mount point.
837 */
838static int fixup_tree_root_location(struct btrfs_root *root,
839 struct btrfs_key *location,
58176a96
JB		 840 struct btrfs_root **sub_root,
841 struct dentry *dentry)
39279cc3
CM		 842{
843 struct btrfs_path *path;
844 struct btrfs_root_item *ri;
845
846 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
847 return 0;
848 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
849 return 0;
850
851 path = btrfs_alloc_path();
852 BUG_ON(!path);
853 mutex_lock(&root->fs_info->fs_mutex);
854
58176a96
JB		 855 *sub_root = btrfs_read_fs_root(root->fs_info, location,
856 dentry->d_name.name,
857 dentry->d_name.len);
39279cc3
CM		 858 if (IS_ERR(*sub_root))
859 return PTR_ERR(*sub_root);
860
861 ri = &(*sub_root)->root_item;
862 location->objectid = btrfs_root_dirid(ri);
863 location->flags = 0;
864 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
865 location->offset = 0;
866
867 btrfs_free_path(path);
868 mutex_unlock(&root->fs_info->fs_mutex);
869 return 0;
870}
871
872static int btrfs_init_locked_inode(struct inode *inode, void *p)
873{
874 struct btrfs_iget_args *args = p;
875 inode->i_ino = args->ino;
876 BTRFS_I(inode)->root = args->root;
b888db2b
CM		 877 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
878 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 879 return 0;
880}
881
882static int btrfs_find_actor(struct inode *inode, void *opaque)
883{
884 struct btrfs_iget_args *args = opaque;
885 return (args->ino == inode->i_ino &&
886 args->root == BTRFS_I(inode)->root);
887}
888
889struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
890 struct btrfs_root *root)
891{
892 struct inode *inode;
893 struct btrfs_iget_args args;
894 args.ino = objectid;
895 args.root = root;
896
897 inode = iget5_locked(s, objectid, btrfs_find_actor,
898 btrfs_init_locked_inode,
899 (void *)&args);
900 return inode;
901}
902
903static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
904 struct nameidata *nd)
905{
906 struct inode * inode;
907 struct btrfs_inode *bi = BTRFS_I(dir);
908 struct btrfs_root *root = bi->root;
909 struct btrfs_root *sub_root = root;
910 struct btrfs_key location;
911 int ret;
912
913 if (dentry->d_name.len > BTRFS_NAME_LEN)
914 return ERR_PTR(-ENAMETOOLONG);
915 mutex_lock(&root->fs_info->fs_mutex);
916 ret = btrfs_inode_by_name(dir, dentry, &location);
917 mutex_unlock(&root->fs_info->fs_mutex);
918 if (ret < 0)
919 return ERR_PTR(ret);
920 inode = NULL;
921 if (location.objectid) {
58176a96
JB		 922 ret = fixup_tree_root_location(root, &location, &sub_root,
923 dentry);
39279cc3
CM		 924 if (ret < 0)
925 return ERR_PTR(ret);
926 if (ret > 0)
927 return ERR_PTR(-ENOENT);
928 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
929 sub_root);
930 if (!inode)
931 return ERR_PTR(-EACCES);
932 if (inode->i_state & I_NEW) {
933 /* the inode and parent dir are two different roots */
934 if (sub_root != root) {
935 igrab(inode);
936 sub_root->inode = inode;
937 }
938 BTRFS_I(inode)->root = sub_root;
939 memcpy(&BTRFS_I(inode)->location, &location,
940 sizeof(location));
941 btrfs_read_locked_inode(inode);
942 unlock_new_inode(inode);
943 }
944 }
945 return d_splice_alias(inode, dentry);
946}
947
39279cc3
CM		 948static unsigned char btrfs_filetype_table[] = {
949 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
950};
951
952static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
953{
954 struct inode *inode = filp->f_path.dentry->d_inode;
955 struct btrfs_root *root = BTRFS_I(inode)->root;
956 struct btrfs_item *item;
957 struct btrfs_dir_item *di;
958 struct btrfs_key key;
959 struct btrfs_path *path;
960 int ret;
961 u32 nritems;
962 struct btrfs_leaf *leaf;
963 int slot;
964 int advance;
965 unsigned char d_type;
966 int over = 0;
967 u32 di_cur;
968 u32 di_total;
969 u32 di_len;
970 int key_type = BTRFS_DIR_INDEX_KEY;
971
972 /* FIXME, use a real flag for deciding about the key type */
973 if (root->fs_info->tree_root == root)
974 key_type = BTRFS_DIR_ITEM_KEY;
975 mutex_lock(&root->fs_info->fs_mutex);
976 key.objectid = inode->i_ino;
977 key.flags = 0;
978 btrfs_set_key_type(&key, key_type);
979 key.offset = filp->f_pos;
980 path = btrfs_alloc_path();
2cc58cf2 981 path->reada = 2;
39279cc3
CM		 982 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
983 if (ret < 0)
984 goto err;
985 advance = 0;
39279cc3
CM		 986 while(1) {
987 leaf = btrfs_buffer_leaf(path->nodes[0]);
988 nritems = btrfs_header_nritems(&leaf->header);
989 slot = path->slots[0];
990 if (advance || slot >= nritems) {
991 if (slot >= nritems -1) {
39279cc3
CM		 992 ret = btrfs_next_leaf(root, path);
993 if (ret)
994 break;
995 leaf = btrfs_buffer_leaf(path->nodes[0]);
996 nritems = btrfs_header_nritems(&leaf->header);
997 slot = path->slots[0];
998 } else {
999 slot++;
1000 path->slots[0]++;
1001 }
1002 }
1003 advance = 1;
1004 item = leaf->items + slot;
1005 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
1006 break;
1007 if (btrfs_disk_key_type(&item->key) != key_type)
1008 break;
1009 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
1010 continue;
1011 filp->f_pos = btrfs_disk_key_offset(&item->key);
1012 advance = 1;
1013 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1014 di_cur = 0;
1015 di_total = btrfs_item_size(leaf->items + slot);
1016 while(di_cur < di_total) {
1017 d_type = btrfs_filetype_table[btrfs_dir_type(di)];
1018 over = filldir(dirent, (const char *)(di + 1),
1019 btrfs_dir_name_len(di),
1020 btrfs_disk_key_offset(&item->key),
1021 btrfs_disk_key_objectid(&di->location),
1022 d_type);
1023 if (over)
1024 goto nopos;
1025 di_len = btrfs_dir_name_len(di) + sizeof(*di);
1026 di_cur += di_len;
1027 di = (struct btrfs_dir_item *)((char *)di + di_len);
1028 }
1029 }
1030 filp->f_pos++;
1031nopos:
1032 ret = 0;
1033err:
1034 btrfs_release_path(root, path);
1035 btrfs_free_path(path);
1036 mutex_unlock(&root->fs_info->fs_mutex);
1037 return ret;
1038}
1039
1040int btrfs_write_inode(struct inode *inode, int wait)
1041{
1042 struct btrfs_root *root = BTRFS_I(inode)->root;
1043 struct btrfs_trans_handle *trans;
1044 int ret = 0;
1045
1046 if (wait) {
1047 mutex_lock(&root->fs_info->fs_mutex);
1048 trans = btrfs_start_transaction(root, 1);
1049 btrfs_set_trans_block_group(trans, inode);
1050 ret = btrfs_commit_transaction(trans, root);
1051 mutex_unlock(&root->fs_info->fs_mutex);
1052 }
1053 return ret;
1054}
1055
1056/*
54aa1f4d 1057 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1058 * inode changes. But, it is most likely to find the inode in cache.
1059 * FIXME, needs more benchmarking...there are no reasons other than performance
1060 * to keep or drop this code.
1061 */
1062void btrfs_dirty_inode(struct inode *inode)
1063{
1064 struct btrfs_root *root = BTRFS_I(inode)->root;
1065 struct btrfs_trans_handle *trans;
1066
1067 mutex_lock(&root->fs_info->fs_mutex);
1068 trans = btrfs_start_transaction(root, 1);
1069 btrfs_set_trans_block_group(trans, inode);
1070 btrfs_update_inode(trans, root, inode);
1071 btrfs_end_transaction(trans, root);
1072 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1073}
1074
1075static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1076 struct btrfs_root *root,
1077 u64 objectid,
1078 struct btrfs_block_group_cache *group,
1079 int mode)
1080{
1081 struct inode *inode;
1082 struct btrfs_inode_item inode_item;
1083 struct btrfs_key *location;
1084 int ret;
1085 int owner;
1086
1087 inode = new_inode(root->fs_info->sb);
1088 if (!inode)
1089 return ERR_PTR(-ENOMEM);
1090
b888db2b
CM		 1091 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1092 inode->i_mapping, GFP_NOFS);
39279cc3 1093 BTRFS_I(inode)->root = root;
b888db2b 1094
39279cc3
CM		 1095 if (mode & S_IFDIR)
1096 owner = 0;
1097 else
1098 owner = 1;
1099 group = btrfs_find_block_group(root, group, 0, 0, owner);
1100 BTRFS_I(inode)->block_group = group;
1101
1102 inode->i_uid = current->fsuid;
1103 inode->i_gid = current->fsgid;
1104 inode->i_mode = mode;
1105 inode->i_ino = objectid;
1106 inode->i_blocks = 0;
1107 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1108 fill_inode_item(&inode_item, inode);
1109 location = &BTRFS_I(inode)->location;
1110 location->objectid = objectid;
1111 location->flags = 0;
1112 location->offset = 0;
1113 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1114
1115 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
54aa1f4d
CM		 1116 if (ret)
1117 return ERR_PTR(ret);
39279cc3
CM		 1118 insert_inode_hash(inode);
1119 return inode;
1120}
1121
1122static inline u8 btrfs_inode_type(struct inode *inode)
1123{
1124 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1125}
1126
1127static int btrfs_add_link(struct btrfs_trans_handle *trans,
1128 struct dentry *dentry, struct inode *inode)
1129{
1130 int ret;
1131 struct btrfs_key key;
1132 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1133 struct inode *parent_inode;
39279cc3
CM		 1134 key.objectid = inode->i_ino;
1135 key.flags = 0;
1136 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1137 key.offset = 0;
1138
1139 ret = btrfs_insert_dir_item(trans, root,
1140 dentry->d_name.name, dentry->d_name.len,
1141 dentry->d_parent->d_inode->i_ino,
1142 &key, btrfs_inode_type(inode));
1143 if (ret == 0) {
79c44584
CM		 1144 parent_inode = dentry->d_parent->d_inode;
1145 parent_inode->i_size += dentry->d_name.len * 2;
1146 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1147 ret = btrfs_update_inode(trans, root,
1148 dentry->d_parent->d_inode);
1149 }
1150 return ret;
1151}
1152
1153static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1154 struct dentry *dentry, struct inode *inode)
1155{
1156 int err = btrfs_add_link(trans, dentry, inode);
1157 if (!err) {
1158 d_instantiate(dentry, inode);
1159 return 0;
1160 }
1161 if (err > 0)
1162 err = -EEXIST;
1163 return err;
1164}
1165
618e21d5
JB		 1166static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1167 int mode, dev_t rdev)
1168{
1169 struct btrfs_trans_handle *trans;
1170 struct btrfs_root *root = BTRFS_I(dir)->root;
1171 struct inode *inode;
1172 int err;
1173 int drop_inode = 0;
1174 u64 objectid;
d3c2fdcf 1175 unsigned long nr;
618e21d5
JB		 1176
1177 if (!new_valid_dev(rdev))
1178 return -EINVAL;
1179
1180 mutex_lock(&root->fs_info->fs_mutex);
1181 trans = btrfs_start_transaction(root, 1);
1182 btrfs_set_trans_block_group(trans, dir);
1183
1184 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1185 if (err) {
1186 err = -ENOSPC;
1187 goto out_unlock;
1188 }
1189
1190 inode = btrfs_new_inode(trans, root, objectid,
1191 BTRFS_I(dir)->block_group, mode);
1192 err = PTR_ERR(inode);
1193 if (IS_ERR(inode))
1194 goto out_unlock;
1195
1196 btrfs_set_trans_block_group(trans, inode);
1197 err = btrfs_add_nondir(trans, dentry, inode);
1198 if (err)
1199 drop_inode = 1;
1200 else {
1201 inode->i_op = &btrfs_special_inode_operations;
1202 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1203 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1204 }
1205 dir->i_sb->s_dirt = 1;
1206 btrfs_update_inode_block_group(trans, inode);
1207 btrfs_update_inode_block_group(trans, dir);
1208out_unlock:
d3c2fdcf 1209 nr = trans->blocks_used;
618e21d5
JB		 1210 btrfs_end_transaction(trans, root);
1211 mutex_unlock(&root->fs_info->fs_mutex);
1212
1213 if (drop_inode) {
1214 inode_dec_link_count(inode);
1215 iput(inode);
1216 }
d3c2fdcf 1217 btrfs_btree_balance_dirty(root, nr);
618e21d5
JB		 1218 return err;
1219}
1220
39279cc3
CM		 1221static int btrfs_create(struct inode *dir, struct dentry *dentry,
1222 int mode, struct nameidata *nd)
1223{
1224 struct btrfs_trans_handle *trans;
1225 struct btrfs_root *root = BTRFS_I(dir)->root;
1226 struct inode *inode;
1227 int err;
1228 int drop_inode = 0;
d3c2fdcf 1229 unsigned long nr;
39279cc3
CM		 1230 u64 objectid;
1231
1232 mutex_lock(&root->fs_info->fs_mutex);
1233 trans = btrfs_start_transaction(root, 1);
1234 btrfs_set_trans_block_group(trans, dir);
1235
1236 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1237 if (err) {
1238 err = -ENOSPC;
1239 goto out_unlock;
1240 }
1241
1242 inode = btrfs_new_inode(trans, root, objectid,
1243 BTRFS_I(dir)->block_group, mode);
1244 err = PTR_ERR(inode);
1245 if (IS_ERR(inode))
1246 goto out_unlock;
1247
1248 btrfs_set_trans_block_group(trans, inode);
1249 err = btrfs_add_nondir(trans, dentry, inode);
1250 if (err)
1251 drop_inode = 1;
1252 else {
1253 inode->i_mapping->a_ops = &btrfs_aops;
1254 inode->i_fop = &btrfs_file_operations;
1255 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 1256 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1257 inode->i_mapping, GFP_NOFS);
07157aac 1258 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 1259 }
1260 dir->i_sb->s_dirt = 1;
1261 btrfs_update_inode_block_group(trans, inode);
1262 btrfs_update_inode_block_group(trans, dir);
1263out_unlock:
d3c2fdcf 1264 nr = trans->blocks_used;
39279cc3
CM		 1265 btrfs_end_transaction(trans, root);
1266 mutex_unlock(&root->fs_info->fs_mutex);
1267
1268 if (drop_inode) {
1269 inode_dec_link_count(inode);
1270 iput(inode);
1271 }
d3c2fdcf 1272 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1273 return err;
1274}
1275
1276static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1277 struct dentry *dentry)
1278{
1279 struct btrfs_trans_handle *trans;
1280 struct btrfs_root *root = BTRFS_I(dir)->root;
1281 struct inode *inode = old_dentry->d_inode;
d3c2fdcf 1282 unsigned long nr;
39279cc3
CM		 1283 int err;
1284 int drop_inode = 0;
1285
1286 if (inode->i_nlink == 0)
1287 return -ENOENT;
1288
1289 inc_nlink(inode);
1290 mutex_lock(&root->fs_info->fs_mutex);
1291 trans = btrfs_start_transaction(root, 1);
1292 btrfs_set_trans_block_group(trans, dir);
1293 atomic_inc(&inode->i_count);
1294 err = btrfs_add_nondir(trans, dentry, inode);
1295 if (err)
1296 drop_inode = 1;
1297 dir->i_sb->s_dirt = 1;
1298 btrfs_update_inode_block_group(trans, dir);
54aa1f4d
CM		 1299 err = btrfs_update_inode(trans, root, inode);
1300 if (err)
1301 drop_inode = 1;
39279cc3 1302
d3c2fdcf 1303 nr = trans->blocks_used;
39279cc3
CM		 1304 btrfs_end_transaction(trans, root);
1305 mutex_unlock(&root->fs_info->fs_mutex);
1306
1307 if (drop_inode) {
1308 inode_dec_link_count(inode);
1309 iput(inode);
1310 }
d3c2fdcf 1311 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1312 return err;
1313}
1314
1315static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
1316 struct btrfs_root *root,
1317 u64 objectid, u64 dirid)
1318{
1319 int ret;
1320 char buf[2];
1321 struct btrfs_key key;
1322
1323 buf[0] = '.';
1324 buf[1] = '.';
1325
1326 key.objectid = objectid;
1327 key.offset = 0;
1328 key.flags = 0;
1329 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1330
1331 ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
1332 &key, BTRFS_FT_DIR);
1333 if (ret)
1334 goto error;
1335 key.objectid = dirid;
1336 ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
1337 &key, BTRFS_FT_DIR);
1338 if (ret)
1339 goto error;
1340error:
1341 return ret;
1342}
1343
1344static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1345{
1346 struct inode *inode;
1347 struct btrfs_trans_handle *trans;
1348 struct btrfs_root *root = BTRFS_I(dir)->root;
1349 int err = 0;
1350 int drop_on_err = 0;
1351 u64 objectid;
d3c2fdcf 1352 unsigned long nr = 1;
39279cc3
CM		 1353
1354 mutex_lock(&root->fs_info->fs_mutex);
1355 trans = btrfs_start_transaction(root, 1);
1356 btrfs_set_trans_block_group(trans, dir);
1357 if (IS_ERR(trans)) {
1358 err = PTR_ERR(trans);
1359 goto out_unlock;
1360 }
1361
1362 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1363 if (err) {
1364 err = -ENOSPC;
1365 goto out_unlock;
1366 }
1367
1368 inode = btrfs_new_inode(trans, root, objectid,
1369 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1370 if (IS_ERR(inode)) {
1371 err = PTR_ERR(inode);
1372 goto out_fail;
1373 }
1374 drop_on_err = 1;
1375 inode->i_op = &btrfs_dir_inode_operations;
1376 inode->i_fop = &btrfs_dir_file_operations;
1377 btrfs_set_trans_block_group(trans, inode);
1378
1379 err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
1380 if (err)
1381 goto out_fail;
1382
1383 inode->i_size = 6;
1384 err = btrfs_update_inode(trans, root, inode);
1385 if (err)
1386 goto out_fail;
1387 err = btrfs_add_link(trans, dentry, inode);
1388 if (err)
1389 goto out_fail;
1390 d_instantiate(dentry, inode);
1391 drop_on_err = 0;
1392 dir->i_sb->s_dirt = 1;
1393 btrfs_update_inode_block_group(trans, inode);
1394 btrfs_update_inode_block_group(trans, dir);
1395
1396out_fail:
d3c2fdcf 1397 nr = trans->blocks_used;
39279cc3
CM		 1398 btrfs_end_transaction(trans, root);
1399out_unlock:
1400 mutex_unlock(&root->fs_info->fs_mutex);
1401 if (drop_on_err)
1402 iput(inode);
d3c2fdcf 1403 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1404 return err;
1405}
1406
a52d9a80
CM		 1407struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1408 size_t page_offset, u64 start, u64 end,
1409 int create)
1410{
1411 int ret;
1412 int err = 0;
1413 u64 blocknr;
1414 u64 extent_start = 0;
1415 u64 extent_end = 0;
1416 u64 objectid = inode->i_ino;
1417 u32 found_type;
1418 int failed_insert = 0;
1419 struct btrfs_path *path;
1420 struct btrfs_root *root = BTRFS_I(inode)->root;
1421 struct btrfs_file_extent_item *item;
1422 struct btrfs_leaf *leaf;
1423 struct btrfs_disk_key *found_key;
1424 struct extent_map *em = NULL;
1425 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1426 struct btrfs_trans_handle *trans = NULL;
1427
1428 path = btrfs_alloc_path();
1429 BUG_ON(!path);
1430 mutex_lock(&root->fs_info->fs_mutex);
1431
1432again:
1433 em = lookup_extent_mapping(em_tree, start, end);
1434 if (em) {
1435 goto out;
1436 }
1437 if (!em) {
1438 em = alloc_extent_map(GFP_NOFS);
1439 if (!em) {
1440 err = -ENOMEM;
1441 goto out;
1442 }
1443 em->start = 0;
1444 em->end = 0;
1445 }
1446 em->bdev = inode->i_sb->s_bdev;
1447 ret = btrfs_lookup_file_extent(NULL, root, path,
1448 objectid, start, 0);
1449 if (ret < 0) {
1450 err = ret;
1451 goto out;
1452 }
1453
1454 if (ret != 0) {
1455 if (path->slots[0] == 0)
1456 goto not_found;
1457 path->slots[0]--;
1458 }
1459
1460 item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
1461 struct btrfs_file_extent_item);
1462 leaf = btrfs_buffer_leaf(path->nodes[0]);
1463 blocknr = btrfs_file_extent_disk_blocknr(item);
1464 blocknr += btrfs_file_extent_offset(item);
1465
1466 /* are we inside the extent that was found? */
1467 found_key = &leaf->items[path->slots[0]].key;
1468 found_type = btrfs_disk_key_type(found_key);
1469 if (btrfs_disk_key_objectid(found_key) != objectid ||
1470 found_type != BTRFS_EXTENT_DATA_KEY) {
1471 goto not_found;
1472 }
1473
1474 found_type = btrfs_file_extent_type(item);
1475 extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
1476 if (found_type == BTRFS_FILE_EXTENT_REG) {
1477 extent_end = extent_start +
1478 (btrfs_file_extent_num_blocks(item) << inode->i_blkbits);
1479 err = 0;
b888db2b 1480 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1481 em->start = start;
1482 if (start < extent_start) {
b888db2b
CM		 1483 if (end < extent_start)
1484 goto not_found;
a52d9a80
CM		 1485 em->end = extent_end - 1;
1486 } else {
1487 em->end = end;
1488 }
1489 goto not_found_em;
1490 }
1491 if (btrfs_file_extent_disk_blocknr(item) == 0) {
1492 em->start = extent_start;
1493 em->end = extent_end - 1;
1494 em->block_start = 0;
1495 em->block_end = 0;
1496 goto insert;
1497 }
1498 em->block_start = blocknr << inode->i_blkbits;
1499 em->block_end = em->block_start +
1500 (btrfs_file_extent_num_blocks(item) <<
1501 inode->i_blkbits) - 1;
1502 em->start = extent_start;
1503 em->end = extent_end - 1;
1504 goto insert;
1505 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1506 char *ptr;
1507 char *map;
1508 u32 size;
1509
1510 size = btrfs_file_extent_inline_len(leaf->items +
1511 path->slots[0]);
1512 extent_end = extent_start + size;
b888db2b 1513 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1514 em->start = start;
1515 if (start < extent_start) {
b888db2b
CM		 1516 if (end < extent_start)
1517 goto not_found;
a52d9a80
CM		 1518 em->end = extent_end - 1;
1519 } else {
1520 em->end = end;
1521 }
1522 goto not_found_em;
1523 }
1524 em->block_start = EXTENT_MAP_INLINE;
1525 em->block_end = EXTENT_MAP_INLINE;
1526 em->start = extent_start;
1527 em->end = extent_end - 1;
1528 if (!page) {
1529 goto insert;
1530 }
1531 ptr = btrfs_file_extent_inline_start(item);
1532 map = kmap(page);
1533 memcpy(map + page_offset, ptr, size);
1534 flush_dcache_page(result->b_page);
1535 kunmap(page);
1536 set_extent_uptodate(em_tree, extent_start,
1537 extent_end, GFP_NOFS);
1538 goto insert;
1539 } else {
1540 printk("unkknown found_type %d\n", found_type);
1541 WARN_ON(1);
1542 }
1543not_found:
1544 em->start = start;
1545 em->end = end;
1546not_found_em:
1547 em->block_start = 0;
1548 em->block_end = 0;
1549insert:
1550 btrfs_release_path(root, path);
1551 if (em->start > start || em->end < start) {
b888db2b 1552 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
a52d9a80
CM		 1553 err = -EIO;
1554 goto out;
1555 }
1556 ret = add_extent_mapping(em_tree, em);
1557 if (ret == -EEXIST) {
1558 free_extent_map(em);
2bf5a725 1559 em = NULL;
a52d9a80
CM		 1560 failed_insert++;
1561 if (failed_insert > 5) {
1562 printk("failing to insert %Lu %Lu\n", start, end);
1563 err = -EIO;
1564 goto out;
1565 }
a52d9a80
CM		 1566 goto again;
1567 }
1568 err = 0;
1569out:
1570 btrfs_free_path(path);
1571 if (trans) {
1572 ret = btrfs_end_transaction(trans, root);
1573 if (!err)
1574 err = ret;
1575 }
1576 mutex_unlock(&root->fs_info->fs_mutex);
1577 if (err) {
1578 free_extent_map(em);
1579 WARN_ON(1);
1580 return ERR_PTR(err);
1581 }
1582 return em;
1583}
1584
d396c6f5 1585static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 1586{
d396c6f5 1587 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 1588}
1589
1590static int btrfs_prepare_write(struct file *file, struct page *page,
1591 unsigned from, unsigned to)
1592{
a52d9a80
CM		 1593 return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree,
1594 page->mapping->host, page, from, to,
1595 btrfs_get_extent);
39279cc3
CM		 1596}
1597
a52d9a80 1598int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 1599{
a52d9a80
CM		 1600 struct extent_map_tree *tree;
1601 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1602 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 1603}
a52d9a80 1604static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 1605{
a52d9a80 1606 struct extent_map_tree *tree;
b888db2b
CM		 1607
1608
1609 if (current->flags & PF_MEMALLOC) {
1610 redirty_page_for_writepage(wbc, page);
1611 unlock_page(page);
1612 return 0;
1613 }
a52d9a80
CM		 1614 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1615 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 1616}
1617
a52d9a80 1618static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
9ebefb18 1619{
a52d9a80
CM		 1620 struct extent_map_tree *tree;
1621 int ret;
8c2383c3 1622
a52d9a80
CM		 1623 if (page->private != 1) {
1624 WARN_ON(1);
1625 return try_to_free_buffers(page);
39279cc3 1626 }
a52d9a80
CM		 1627 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1628 ret = try_release_extent_mapping(tree, page);
1629 if (ret == 1) {
1630 ClearPagePrivate(page);
1631 set_page_private(page, 0);
1632 page_cache_release(page);
39279cc3 1633 }
a52d9a80 1634 return ret;
39279cc3
CM		 1635}
1636
a52d9a80 1637static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 1638{
a52d9a80 1639 struct extent_map_tree *tree;
39279cc3 1640
a52d9a80
CM		 1641 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1642 extent_invalidatepage(tree, page, offset);
1643 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 1644}
1645
9ebefb18
CM		 1646/*
1647 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1648 * called from a page fault handler when a page is first dirtied. Hence we must
1649 * be careful to check for EOF conditions here. We set the page up correctly
1650 * for a written page which means we get ENOSPC checking when writing into
1651 * holes and correct delalloc and unwritten extent mapping on filesystems that
1652 * support these features.
1653 *
1654 * We are not allowed to take the i_mutex here so we have to play games to
1655 * protect against truncate races as the page could now be beyond EOF. Because
1656 * vmtruncate() writes the inode size before removing pages, once we have the
1657 * page lock we can determine safely if the page is beyond EOF. If it is not
1658 * beyond EOF, then the page is guaranteed safe against truncation until we
1659 * unlock the page.
1660 */
1661int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
1662{
1663 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
1664 unsigned long end;
1665 loff_t size;
1666 int ret = -EINVAL;
a52d9a80 1667 u64 page_start;
9ebefb18 1668
011410bd 1669 down_read(&BTRFS_I(inode)->root->snap_sem);
9ebefb18
CM		 1670 lock_page(page);
1671 wait_on_page_writeback(page);
9ebefb18 1672 size = i_size_read(inode);
a52d9a80
CM		 1673 page_start = page->index << PAGE_CACHE_SHIFT;
1674
9ebefb18 1675 if ((page->mapping != inode->i_mapping) ||
a52d9a80 1676 (page_start > size)) {
9ebefb18
CM		 1677 /* page got truncated out from underneath us */
1678 goto out_unlock;
1679 }
1680
1681 /* page is wholly or partially inside EOF */
a52d9a80 1682 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 1683 end = size & ~PAGE_CACHE_MASK;
1684 else
1685 end = PAGE_CACHE_SIZE;
1686
b888db2b 1687 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 1688
1689out_unlock:
011410bd 1690 up_read(&BTRFS_I(inode)->root->snap_sem);
9ebefb18
CM		 1691 unlock_page(page);
1692 return ret;
1693}
1694
39279cc3
CM		 1695static void btrfs_truncate(struct inode *inode)
1696{
1697 struct btrfs_root *root = BTRFS_I(inode)->root;
1698 int ret;
1699 struct btrfs_trans_handle *trans;
d3c2fdcf 1700 unsigned long nr;
39279cc3
CM		 1701
1702 if (!S_ISREG(inode->i_mode))
1703 return;
1704 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1705 return;
1706
1707 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1708
1709 mutex_lock(&root->fs_info->fs_mutex);
1710 trans = btrfs_start_transaction(root, 1);
1711 btrfs_set_trans_block_group(trans, inode);
1712
1713 /* FIXME, add redo link to tree so we don't leak on crash */
1714 ret = btrfs_truncate_in_trans(trans, root, inode);
39279cc3 1715 btrfs_update_inode(trans, root, inode);
d3c2fdcf 1716 nr = trans->blocks_used;
39279cc3
CM		 1717 ret = btrfs_end_transaction(trans, root);
1718 BUG_ON(ret);
1719 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1720 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1721}
1722
1723int btrfs_commit_write(struct file *file, struct page *page,
1724 unsigned from, unsigned to)
1725{
a52d9a80
CM		 1726 return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree,
1727 page->mapping->host, page, from, to);
39279cc3
CM		 1728}
1729
1730static int create_subvol(struct btrfs_root *root, char *name, int namelen)
1731{
1732 struct btrfs_trans_handle *trans;
1733 struct btrfs_key key;
1734 struct btrfs_root_item root_item;
1735 struct btrfs_inode_item *inode_item;
1736 struct buffer_head *subvol;
1737 struct btrfs_leaf *leaf;
1738 struct btrfs_root *new_root;
1739 struct inode *inode;
1740 struct inode *dir;
1741 int ret;
54aa1f4d 1742 int err;
39279cc3
CM		 1743 u64 objectid;
1744 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 1745 unsigned long nr = 1;
39279cc3
CM		 1746
1747 mutex_lock(&root->fs_info->fs_mutex);
1748 trans = btrfs_start_transaction(root, 1);
1749 BUG_ON(!trans);
1750
6702ed49 1751 subvol = btrfs_alloc_free_block(trans, root, 0, 0);
54aa1f4d
CM		 1752 if (IS_ERR(subvol))
1753 return PTR_ERR(subvol);
39279cc3
CM		 1754 leaf = btrfs_buffer_leaf(subvol);
1755 btrfs_set_header_nritems(&leaf->header, 0);
1756 btrfs_set_header_level(&leaf->header, 0);
1757 btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
1758 btrfs_set_header_generation(&leaf->header, trans->transid);
1759 btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
1760 memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
1761 sizeof(leaf->header.fsid));
ccd467d6 1762 btrfs_mark_buffer_dirty(subvol);
39279cc3
CM		 1763
1764 inode_item = &root_item.inode;
1765 memset(inode_item, 0, sizeof(*inode_item));
1766 btrfs_set_inode_generation(inode_item, 1);
1767 btrfs_set_inode_size(inode_item, 3);
1768 btrfs_set_inode_nlink(inode_item, 1);
1769 btrfs_set_inode_nblocks(inode_item, 1);
1770 btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
1771
1772 btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
1773 btrfs_set_root_refs(&root_item, 1);
58176a96 1774 btrfs_set_root_blocks_used(&root_item, 0);
5eda7b5e
CM		 1775 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
1776 root_item.drop_level = 0;
39279cc3
CM		 1777 brelse(subvol);
1778 subvol = NULL;
1779
1780 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
1781 0, &objectid);
54aa1f4d
CM		 1782 if (ret)
1783 goto fail;
39279cc3
CM		 1784
1785 btrfs_set_root_dirid(&root_item, new_dirid);
1786
1787 key.objectid = objectid;
1788 key.offset = 1;
1789 key.flags = 0;
1790 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
1791 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
1792 &root_item);
54aa1f4d
CM		 1793 if (ret)
1794 goto fail;
39279cc3
CM		 1795
1796 /*
1797 * insert the directory item
1798 */
1799 key.offset = (u64)-1;
1800 dir = root->fs_info->sb->s_root->d_inode;
1801 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
1802 name, namelen, dir->i_ino, &key,
1803 BTRFS_FT_DIR);
54aa1f4d
CM		 1804 if (ret)
1805 goto fail;
39279cc3
CM		 1806
1807 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 1808 if (ret)
1809 goto fail_commit;
39279cc3 1810
58176a96 1811 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 1812 BUG_ON(!new_root);
1813
1814 trans = btrfs_start_transaction(new_root, 1);
1815 BUG_ON(!trans);
1816
1817 inode = btrfs_new_inode(trans, new_root, new_dirid,
1818 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 1819 if (IS_ERR(inode))
1820 goto fail;
39279cc3
CM		 1821 inode->i_op = &btrfs_dir_inode_operations;
1822 inode->i_fop = &btrfs_dir_file_operations;
34088780 1823 new_root->inode = inode;
39279cc3
CM		 1824
1825 ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
54aa1f4d
CM		 1826 if (ret)
1827 goto fail;
39279cc3
CM		 1828
1829 inode->i_nlink = 1;
1830 inode->i_size = 6;
1831 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 1832 if (ret)
1833 goto fail;
1834fail:
d3c2fdcf 1835 nr = trans->blocks_used;
54aa1f4d
CM		 1836 err = btrfs_commit_transaction(trans, root);
1837 if (err && !ret)
1838 ret = err;
1839fail_commit:
39279cc3 1840 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1841 btrfs_btree_balance_dirty(root, nr);
54aa1f4d 1842 return ret;
39279cc3
CM		 1843}
1844
1845static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
1846{
1847 struct btrfs_trans_handle *trans;
1848 struct btrfs_key key;
1849 struct btrfs_root_item new_root_item;
83df7c1d 1850 struct buffer_head *tmp;
39279cc3 1851 int ret;
54aa1f4d 1852 int err;
39279cc3 1853 u64 objectid;
d3c2fdcf 1854 unsigned long nr;
39279cc3
CM		 1855
1856 if (!root->ref_cows)
1857 return -EINVAL;
1858
011410bd
CM		 1859 down_write(&root->snap_sem);
1860 freeze_bdev(root->fs_info->sb->s_bdev);
1861 thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb);
1862
39279cc3
CM		 1863 mutex_lock(&root->fs_info->fs_mutex);
1864 trans = btrfs_start_transaction(root, 1);
1865 BUG_ON(!trans);
1866
1867 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d
CM		 1868 if (ret)
1869 goto fail;
39279cc3
CM		 1870
1871 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
1872 0, &objectid);
54aa1f4d
CM		 1873 if (ret)
1874 goto fail;
39279cc3
CM		 1875
1876 memcpy(&new_root_item, &root->root_item,
1877 sizeof(new_root_item));
1878
1879 key.objectid = objectid;
1880 key.offset = 1;
1881 key.flags = 0;
1882 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
83df7c1d 1883 btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
39279cc3
CM		 1884 btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node));
1885
1886 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
1887 &new_root_item);
54aa1f4d
CM		 1888 if (ret)
1889 goto fail;
39279cc3
CM		 1890
1891 /*
1892 * insert the directory item
1893 */
1894 key.offset = (u64)-1;
1895 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
1896 name, namelen,
1897 root->fs_info->sb->s_root->d_inode->i_ino,
1898 &key, BTRFS_FT_DIR);
1899
54aa1f4d
CM		 1900 if (ret)
1901 goto fail;
39279cc3
CM		 1902
1903 ret = btrfs_inc_root_ref(trans, root);
54aa1f4d
CM		 1904 if (ret)
1905 goto fail;
54aa1f4d 1906fail:
d3c2fdcf 1907 nr = trans->blocks_used;
54aa1f4d
CM		 1908 err = btrfs_commit_transaction(trans, root);
1909 if (err && !ret)
1910 ret = err;
39279cc3 1911 mutex_unlock(&root->fs_info->fs_mutex);
011410bd 1912 up_write(&root->snap_sem);
d3c2fdcf 1913 btrfs_btree_balance_dirty(root, nr);
54aa1f4d 1914 return ret;
39279cc3
CM		 1915}
1916
86479a04
CM		 1917static unsigned long force_ra(struct address_space *mapping,
1918 struct file_ra_state *ra, struct file *file,
1919 pgoff_t offset, pgoff_t last_index)
1920{
1921 pgoff_t req_size;
1922
1923#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
1924 req_size = last_index - offset + 1;
1925 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
1926 return offset;
1927#else
1928 req_size = min(last_index - offset + 1, (pgoff_t)128);
1929 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
1930 return offset + req_size;
1931#endif
1932}
1933
1934int btrfs_defrag_file(struct file *file) {
1935 struct inode *inode = file->f_path.dentry->d_inode;
1936 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1937 struct page *page;
1938 unsigned long last_index;
1939 unsigned long ra_index = 0;
1940 u64 page_start;
1941 u64 page_end;
1942 unsigned long i;
1943
1944 mutex_lock(&inode->i_mutex);
1945 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
1946 for (i = 0; i <= last_index; i++) {
1947 if (i == ra_index) {
1948 ra_index = force_ra(inode->i_mapping, &file->f_ra,
1949 file, ra_index, last_index);
1950 }
1951 page = grab_cache_page(inode->i_mapping, i);
1952 if (!page)
1953 goto out_unlock;
1954 if (!PageUptodate(page)) {
1955 btrfs_readpage(NULL, page);
1956 lock_page(page);
1957 if (!PageUptodate(page)) {
1958 unlock_page(page);
1959 page_cache_release(page);
1960 goto out_unlock;
1961 }
1962 }
1963 page_start = page->index << PAGE_CACHE_SHIFT;
1964 page_end = page_start + PAGE_CACHE_SIZE - 1;
1965
1966 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
1967 set_extent_delalloc(em_tree, page_start,
1968 page_end, GFP_NOFS);
1969 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
1970 set_page_dirty(page);
1971 unlock_page(page);
1972 page_cache_release(page);
1973 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
1974 }
1975
1976out_unlock:
1977 mutex_unlock(&inode->i_mutex);
1978 return 0;
1979}
1980
d03581f4 1981static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
39279cc3 1982{
39279cc3 1983 struct btrfs_ioctl_vol_args vol_args;
39279cc3 1984 struct btrfs_dir_item *di;
39279cc3 1985 struct btrfs_path *path;
d03581f4 1986 int namelen;
39279cc3
CM		 1987 u64 root_dirid;
1988
d03581f4
CH		 1989 if (copy_from_user(&vol_args, arg, sizeof(vol_args)))
1990 return -EFAULT;
1991
1992 namelen = strlen(vol_args.name);
1993 if (namelen > BTRFS_VOL_NAME_MAX)
1994 return -EINVAL;
1995 if (strchr(vol_args.name, '/'))
1996 return -EINVAL;
1997
1998 path = btrfs_alloc_path();
1999 if (!path)
2000 return -ENOMEM;
2001
2002 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2003 mutex_lock(&root->fs_info->fs_mutex);
2004 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2005 path, root_dirid,
2006 vol_args.name, namelen, 0);
2007 mutex_unlock(&root->fs_info->fs_mutex);
2008 btrfs_free_path(path);
2009 if (di && !IS_ERR(di))
2010 return -EEXIST;
2011 if (IS_ERR(di))
2012 return PTR_ERR(di);
2013
2014 if (root == root->fs_info->tree_root)
2015 return create_subvol(root, vol_args.name, namelen);
2016 return create_snapshot(root, vol_args.name, namelen);
2017}
2018
2019static int btrfs_ioctl_defrag(struct file *file)
2020{
2021 struct inode *inode = file->f_path.dentry->d_inode;
2022 struct btrfs_root *root = BTRFS_I(inode)->root;
2023
2024 switch (inode->i_mode & S_IFMT) {
2025 case S_IFDIR:
39279cc3 2026 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2027 btrfs_defrag_root(root, 0);
2028 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2029 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2030 break;
d03581f4
CH		 2031 case S_IFREG:
2032 btrfs_defrag_file(file);
2033 break;
2034 }
2035
2036 return 0;
2037}
6702ed49 2038
d03581f4
CH		 2039long btrfs_ioctl(struct file *file, unsigned int
2040 cmd, unsigned long arg)
2041{
2042 struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root;
2043
2044 switch (cmd) {
2045 case BTRFS_IOC_SNAP_CREATE:
2046 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2047 case BTRFS_IOC_DEFRAG:
d03581f4 2048 return btrfs_ioctl_defrag(file);
39279cc3 2049 }
d03581f4
CH		 2050
2051 return -ENOTTY;
39279cc3
CM		 2052}
2053
39279cc3
CM		 2054/*
2055 * Called inside transaction, so use GFP_NOFS
2056 */
2057struct inode *btrfs_alloc_inode(struct super_block *sb)
2058{
2059 struct btrfs_inode *ei;
2060
2061 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2062 if (!ei)
2063 return NULL;
15ee9bc7 2064 ei->last_trans = 0;
39279cc3
CM		 2065 return &ei->vfs_inode;
2066}
2067
2068void btrfs_destroy_inode(struct inode *inode)
2069{
2070 WARN_ON(!list_empty(&inode->i_dentry));
2071 WARN_ON(inode->i_data.nrpages);
2072
2073 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2074}
2075
2076static void init_once(void * foo, struct kmem_cache * cachep,
2077 unsigned long flags)
2078{
2079 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2080
2081 inode_init_once(&ei->vfs_inode);
2082}
2083
2084void btrfs_destroy_cachep(void)
2085{
2086 if (btrfs_inode_cachep)
2087 kmem_cache_destroy(btrfs_inode_cachep);
2088 if (btrfs_trans_handle_cachep)
2089 kmem_cache_destroy(btrfs_trans_handle_cachep);
2090 if (btrfs_transaction_cachep)
2091 kmem_cache_destroy(btrfs_transaction_cachep);
2092 if (btrfs_bit_radix_cachep)
2093 kmem_cache_destroy(btrfs_bit_radix_cachep);
2094 if (btrfs_path_cachep)
2095 kmem_cache_destroy(btrfs_path_cachep);
2096}
2097
86479a04 2098struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d
CM		 2099 unsigned long extra_flags,
2100 void (*ctor)(void *, struct kmem_cache *,
2101 unsigned long))
2102{
2103 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2104 SLAB_MEM_SPREAD | extra_flags), ctor
2105#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2106 ,NULL
2107#endif
2108 );
2109}
2110
39279cc3
CM		 2111int btrfs_init_cachep(void)
2112{
86479a04 2113 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 2114 sizeof(struct btrfs_inode),
2115 0, init_once);
39279cc3
CM		 2116 if (!btrfs_inode_cachep)
2117 goto fail;
86479a04
CM		 2118 btrfs_trans_handle_cachep =
2119 btrfs_cache_create("btrfs_trans_handle_cache",
2120 sizeof(struct btrfs_trans_handle),
2121 0, NULL);
39279cc3
CM		 2122 if (!btrfs_trans_handle_cachep)
2123 goto fail;
86479a04 2124 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 2125 sizeof(struct btrfs_transaction),
92fee66d 2126 0, NULL);
39279cc3
CM		 2127 if (!btrfs_transaction_cachep)
2128 goto fail;
86479a04 2129 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
92fee66d
CM		 2130 sizeof(struct btrfs_transaction),
2131 0, NULL);
39279cc3
CM		 2132 if (!btrfs_path_cachep)
2133 goto fail;
86479a04 2134 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 2135 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2136 if (!btrfs_bit_radix_cachep)
2137 goto fail;
2138 return 0;
2139fail:
2140 btrfs_destroy_cachep();
2141 return -ENOMEM;
2142}
2143
2144static int btrfs_getattr(struct vfsmount *mnt,
2145 struct dentry *dentry, struct kstat *stat)
2146{
2147 struct inode *inode = dentry->d_inode;
2148 generic_fillattr(inode, stat);
2149 stat->blksize = 256 * 1024;
2150 return 0;
2151}
2152
2153static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2154 struct inode * new_dir,struct dentry *new_dentry)
2155{
2156 struct btrfs_trans_handle *trans;
2157 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2158 struct inode *new_inode = new_dentry->d_inode;
2159 struct inode *old_inode = old_dentry->d_inode;
2160 struct timespec ctime = CURRENT_TIME;
2161 struct btrfs_path *path;
2162 struct btrfs_dir_item *di;
2163 int ret;
2164
2165 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2166 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2167 return -ENOTEMPTY;
2168 }
2169 mutex_lock(&root->fs_info->fs_mutex);
2170 trans = btrfs_start_transaction(root, 1);
2171 btrfs_set_trans_block_group(trans, new_dir);
2172 path = btrfs_alloc_path();
2173 if (!path) {
2174 ret = -ENOMEM;
2175 goto out_fail;
2176 }
2177
2178 old_dentry->d_inode->i_nlink++;
2179 old_dir->i_ctime = old_dir->i_mtime = ctime;
2180 new_dir->i_ctime = new_dir->i_mtime = ctime;
2181 old_inode->i_ctime = ctime;
2182 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
2183 struct btrfs_key *location = &BTRFS_I(new_dir)->location;
2184 u64 old_parent_oid;
2185 di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
2186 "..", 2, -1);
2187 if (IS_ERR(di)) {
2188 ret = PTR_ERR(di);
2189 goto out_fail;
2190 }
2191 if (!di) {
2192 ret = -ENOENT;
2193 goto out_fail;
2194 }
2195 old_parent_oid = btrfs_disk_key_objectid(&di->location);
2196 ret = btrfs_del_item(trans, root, path);
2197 if (ret) {
39279cc3
CM		 2198 goto out_fail;
2199 }
2200 btrfs_release_path(root, path);
2201
2202 di = btrfs_lookup_dir_index_item(trans, root, path,
2203 old_inode->i_ino,
2204 old_parent_oid,
2205 "..", 2, -1);
2206 if (IS_ERR(di)) {
2207 ret = PTR_ERR(di);
2208 goto out_fail;
2209 }
2210 if (!di) {
2211 ret = -ENOENT;
2212 goto out_fail;
2213 }
2214 ret = btrfs_del_item(trans, root, path);
2215 if (ret) {
39279cc3
CM		 2216 goto out_fail;
2217 }
2218 btrfs_release_path(root, path);
2219
2220 ret = btrfs_insert_dir_item(trans, root, "..", 2,
2221 old_inode->i_ino, location,
2222 BTRFS_FT_DIR);
2223 if (ret)
2224 goto out_fail;
2225 }
2226
2227
2228 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2229 if (ret)
2230 goto out_fail;
2231
2232 if (new_inode) {
2233 new_inode->i_ctime = CURRENT_TIME;
2234 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2235 if (ret)
2236 goto out_fail;
39279cc3
CM		 2237 }
2238 ret = btrfs_add_link(trans, new_dentry, old_inode);
2239 if (ret)
2240 goto out_fail;
2241
2242out_fail:
2243 btrfs_free_path(path);
2244 btrfs_end_transaction(trans, root);
2245 mutex_unlock(&root->fs_info->fs_mutex);
2246 return ret;
2247}
2248
2249static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2250 const char *symname)
2251{
2252 struct btrfs_trans_handle *trans;
2253 struct btrfs_root *root = BTRFS_I(dir)->root;
2254 struct btrfs_path *path;
2255 struct btrfs_key key;
2256 struct inode *inode;
2257 int err;
2258 int drop_inode = 0;
2259 u64 objectid;
2260 int name_len;
2261 int datasize;
2262 char *ptr;
2263 struct btrfs_file_extent_item *ei;
d3c2fdcf 2264 unsigned long nr;
39279cc3
CM		 2265
2266 name_len = strlen(symname) + 1;
2267 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2268 return -ENAMETOOLONG;
2269 mutex_lock(&root->fs_info->fs_mutex);
2270 trans = btrfs_start_transaction(root, 1);
2271 btrfs_set_trans_block_group(trans, dir);
2272
2273 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2274 if (err) {
2275 err = -ENOSPC;
2276 goto out_unlock;
2277 }
2278
2279 inode = btrfs_new_inode(trans, root, objectid,
2280 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2281 err = PTR_ERR(inode);
2282 if (IS_ERR(inode))
2283 goto out_unlock;
2284
2285 btrfs_set_trans_block_group(trans, inode);
2286 err = btrfs_add_nondir(trans, dentry, inode);
2287 if (err)
2288 drop_inode = 1;
2289 else {
2290 inode->i_mapping->a_ops = &btrfs_aops;
2291 inode->i_fop = &btrfs_file_operations;
2292 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 2293 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2294 inode->i_mapping, GFP_NOFS);
07157aac 2295 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 2296 }
2297 dir->i_sb->s_dirt = 1;
2298 btrfs_update_inode_block_group(trans, inode);
2299 btrfs_update_inode_block_group(trans, dir);
2300 if (drop_inode)
2301 goto out_unlock;
2302
2303 path = btrfs_alloc_path();
2304 BUG_ON(!path);
2305 key.objectid = inode->i_ino;
2306 key.offset = 0;
2307 key.flags = 0;
2308 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2309 datasize = btrfs_file_extent_calc_inline_size(name_len);
2310 err = btrfs_insert_empty_item(trans, root, path, &key,
2311 datasize);
54aa1f4d
CM		 2312 if (err) {
2313 drop_inode = 1;
2314 goto out_unlock;
2315 }
39279cc3
CM		 2316 ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
2317 path->slots[0], struct btrfs_file_extent_item);
2318 btrfs_set_file_extent_generation(ei, trans->transid);
2319 btrfs_set_file_extent_type(ei,
2320 BTRFS_FILE_EXTENT_INLINE);
2321 ptr = btrfs_file_extent_inline_start(ei);
2322 btrfs_memcpy(root, path->nodes[0]->b_data,
2323 ptr, symname, name_len);
ccd467d6 2324 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3
CM		 2325 btrfs_free_path(path);
2326 inode->i_op = &btrfs_symlink_inode_operations;
2327 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2328 inode->i_size = name_len - 1;
54aa1f4d
CM		 2329 err = btrfs_update_inode(trans, root, inode);
2330 if (err)
2331 drop_inode = 1;
39279cc3
CM		 2332
2333out_unlock:
d3c2fdcf 2334 nr = trans->blocks_used;
39279cc3
CM		 2335 btrfs_end_transaction(trans, root);
2336 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2337 if (drop_inode) {
2338 inode_dec_link_count(inode);
2339 iput(inode);
2340 }
d3c2fdcf 2341 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 2342 return err;
2343}
2344
2345static struct inode_operations btrfs_dir_inode_operations = {
2346 .lookup = btrfs_lookup,
2347 .create = btrfs_create,
2348 .unlink = btrfs_unlink,
2349 .link = btrfs_link,
2350 .mkdir = btrfs_mkdir,
2351 .rmdir = btrfs_rmdir,
2352 .rename = btrfs_rename,
2353 .symlink = btrfs_symlink,
2354 .setattr = btrfs_setattr,
618e21d5 2355 .mknod = btrfs_mknod,
39279cc3
CM		 2356};
2357
2358static struct inode_operations btrfs_dir_ro_inode_operations = {
2359 .lookup = btrfs_lookup,
2360};
2361
2362static struct file_operations btrfs_dir_file_operations = {
2363 .llseek = generic_file_llseek,
2364 .read = generic_read_dir,
2365 .readdir = btrfs_readdir,
34287aa3 2366 .unlocked_ioctl = btrfs_ioctl,
39279cc3 2367#ifdef CONFIG_COMPAT
34287aa3 2368 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 2369#endif
2370};
2371
07157aac
CM		 2372static struct extent_map_ops btrfs_extent_map_ops = {
2373 .fill_delalloc = run_delalloc_range,
2374 .writepage_io_hook = btrfs_writepage_io_hook,
2375 .readpage_io_hook = btrfs_readpage_io_hook,
2376 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2377};
2378
39279cc3
CM		 2379static struct address_space_operations btrfs_aops = {
2380 .readpage = btrfs_readpage,
2381 .writepage = btrfs_writepage,
2382 .sync_page = block_sync_page,
2383 .prepare_write = btrfs_prepare_write,
2384 .commit_write = btrfs_commit_write,
2385 .bmap = btrfs_bmap,
a52d9a80
CM		 2386 .invalidatepage = btrfs_invalidatepage,
2387 .releasepage = btrfs_releasepage,
2388 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 2389};
2390
2391static struct address_space_operations btrfs_symlink_aops = {
2392 .readpage = btrfs_readpage,
2393 .writepage = btrfs_writepage,
2bf5a725
CM		 2394 .invalidatepage = btrfs_invalidatepage,
2395 .releasepage = btrfs_releasepage,
39279cc3
CM		 2396};
2397
2398static struct inode_operations btrfs_file_inode_operations = {
2399 .truncate = btrfs_truncate,
2400 .getattr = btrfs_getattr,
2401 .setattr = btrfs_setattr,
2402};
2403
618e21d5
JB		 2404static struct inode_operations btrfs_special_inode_operations = {
2405 .getattr = btrfs_getattr,
2406 .setattr = btrfs_setattr,
2407};
2408
39279cc3
CM		 2409static struct inode_operations btrfs_symlink_inode_operations = {
2410 .readlink = generic_readlink,
2411 .follow_link = page_follow_link_light,
2412 .put_link = page_put_link,
2413};
Linux 6.x block layer and io_uring tree(s)