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Btrfs: Add BH_Defrag to mark buffers that are in need of defragging
[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;
55
56static struct kmem_cache *btrfs_inode_cachep;
57struct kmem_cache *btrfs_trans_handle_cachep;
58struct kmem_cache *btrfs_transaction_cachep;
59struct kmem_cache *btrfs_bit_radix_cachep;
60struct kmem_cache *btrfs_path_cachep;
61
62#define S_SHIFT 12
63static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
64 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
65 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
66 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
67 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
68 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
69 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
70 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
71};
72
73void btrfs_read_locked_inode(struct inode *inode)
74{
75 struct btrfs_path *path;
76 struct btrfs_inode_item *inode_item;
77 struct btrfs_root *root = BTRFS_I(inode)->root;
78 struct btrfs_key location;
79 u64 alloc_group_block;
618e21d5 80 u32 rdev;
39279cc3
CM		 81 int ret;
82
83 path = btrfs_alloc_path();
84 BUG_ON(!path);
39279cc3
CM		 85 mutex_lock(&root->fs_info->fs_mutex);
86
87 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
88 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
89 if (ret) {
90 btrfs_free_path(path);
91 goto make_bad;
92 }
93 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
94 path->slots[0],
95 struct btrfs_inode_item);
96
97 inode->i_mode = btrfs_inode_mode(inode_item);
98 inode->i_nlink = btrfs_inode_nlink(inode_item);
99 inode->i_uid = btrfs_inode_uid(inode_item);
100 inode->i_gid = btrfs_inode_gid(inode_item);
101 inode->i_size = btrfs_inode_size(inode_item);
102 inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
103 inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
104 inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
105 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
106 inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
107 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
108 inode->i_blocks = btrfs_inode_nblocks(inode_item);
109 inode->i_generation = btrfs_inode_generation(inode_item);
618e21d5
JB		 110 inode->i_rdev = 0;
111 rdev = btrfs_inode_rdev(inode_item);
39279cc3
CM		 112 alloc_group_block = btrfs_inode_block_group(inode_item);
113 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
114 alloc_group_block);
115
116 btrfs_free_path(path);
117 inode_item = NULL;
118
119 mutex_unlock(&root->fs_info->fs_mutex);
120
121 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 122 case S_IFREG:
123 inode->i_mapping->a_ops = &btrfs_aops;
124 inode->i_fop = &btrfs_file_operations;
125 inode->i_op = &btrfs_file_inode_operations;
126 break;
127 case S_IFDIR:
128 inode->i_fop = &btrfs_dir_file_operations;
129 if (root == root->fs_info->tree_root)
130 inode->i_op = &btrfs_dir_ro_inode_operations;
131 else
132 inode->i_op = &btrfs_dir_inode_operations;
133 break;
134 case S_IFLNK:
135 inode->i_op = &btrfs_symlink_inode_operations;
136 inode->i_mapping->a_ops = &btrfs_symlink_aops;
137 break;
618e21d5
JB		 138 default:
139 init_special_inode(inode, inode->i_mode, rdev);
140 break;
39279cc3
CM		 141 }
142 return;
143
144make_bad:
145 btrfs_release_path(root, path);
146 btrfs_free_path(path);
147 mutex_unlock(&root->fs_info->fs_mutex);
148 make_bad_inode(inode);
149}
150
151static void fill_inode_item(struct btrfs_inode_item *item,
152 struct inode *inode)
153{
154 btrfs_set_inode_uid(item, inode->i_uid);
155 btrfs_set_inode_gid(item, inode->i_gid);
156 btrfs_set_inode_size(item, inode->i_size);
157 btrfs_set_inode_mode(item, inode->i_mode);
158 btrfs_set_inode_nlink(item, inode->i_nlink);
159 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
160 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
161 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
162 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
163 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
164 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
165 btrfs_set_inode_nblocks(item, inode->i_blocks);
166 btrfs_set_inode_generation(item, inode->i_generation);
618e21d5 167 btrfs_set_inode_rdev(item, inode->i_rdev);
39279cc3
CM		 168 btrfs_set_inode_block_group(item,
169 BTRFS_I(inode)->block_group->key.objectid);
170}
171
172static int btrfs_update_inode(struct btrfs_trans_handle *trans,
173 struct btrfs_root *root,
174 struct inode *inode)
175{
176 struct btrfs_inode_item *inode_item;
177 struct btrfs_path *path;
178 int ret;
179
180 path = btrfs_alloc_path();
181 BUG_ON(!path);
39279cc3
CM		 182 ret = btrfs_lookup_inode(trans, root, path,
183 &BTRFS_I(inode)->location, 1);
184 if (ret) {
185 if (ret > 0)
186 ret = -ENOENT;
187 goto failed;
188 }
189
190 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
191 path->slots[0],
192 struct btrfs_inode_item);
193
194 fill_inode_item(inode_item, inode);
195 btrfs_mark_buffer_dirty(path->nodes[0]);
196 ret = 0;
197failed:
198 btrfs_release_path(root, path);
199 btrfs_free_path(path);
200 return ret;
201}
202
203
204static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
205 struct btrfs_root *root,
206 struct inode *dir,
207 struct dentry *dentry)
208{
209 struct btrfs_path *path;
210 const char *name = dentry->d_name.name;
211 int name_len = dentry->d_name.len;
212 int ret = 0;
213 u64 objectid;
214 struct btrfs_dir_item *di;
215
216 path = btrfs_alloc_path();
54aa1f4d
CM		 217 if (!path) {
218 ret = -ENOMEM;
219 goto err;
220 }
221
39279cc3
CM		 222 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
223 name, name_len, -1);
224 if (IS_ERR(di)) {
225 ret = PTR_ERR(di);
226 goto err;
227 }
228 if (!di) {
229 ret = -ENOENT;
230 goto err;
231 }
232 objectid = btrfs_disk_key_objectid(&di->location);
233 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 234 if (ret)
235 goto err;
39279cc3
CM		 236 btrfs_release_path(root, path);
237
238 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
239 objectid, name, name_len, -1);
240 if (IS_ERR(di)) {
241 ret = PTR_ERR(di);
242 goto err;
243 }
244 if (!di) {
245 ret = -ENOENT;
246 goto err;
247 }
248 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 249
250 dentry->d_inode->i_ctime = dir->i_ctime;
251err:
252 btrfs_free_path(path);
253 if (!ret) {
254 dir->i_size -= name_len * 2;
79c44584 255 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3
CM		 256 btrfs_update_inode(trans, root, dir);
257 drop_nlink(dentry->d_inode);
54aa1f4d 258 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 259 dir->i_sb->s_dirt = 1;
260 }
261 return ret;
262}
263
264static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
265{
266 struct btrfs_root *root;
267 struct btrfs_trans_handle *trans;
268 int ret;
269
270 root = BTRFS_I(dir)->root;
271 mutex_lock(&root->fs_info->fs_mutex);
272 trans = btrfs_start_transaction(root, 1);
273 btrfs_set_trans_block_group(trans, dir);
274 ret = btrfs_unlink_trans(trans, root, dir, dentry);
275 btrfs_end_transaction(trans, root);
276 mutex_unlock(&root->fs_info->fs_mutex);
277 btrfs_btree_balance_dirty(root);
278 return ret;
279}
280
281static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
282{
283 struct inode *inode = dentry->d_inode;
284 int err;
285 int ret;
286 struct btrfs_root *root = BTRFS_I(dir)->root;
287 struct btrfs_path *path;
288 struct btrfs_key key;
289 struct btrfs_trans_handle *trans;
290 struct btrfs_key found_key;
291 int found_type;
292 struct btrfs_leaf *leaf;
293 char *goodnames = "..";
294
295 path = btrfs_alloc_path();
296 BUG_ON(!path);
39279cc3
CM		 297 mutex_lock(&root->fs_info->fs_mutex);
298 trans = btrfs_start_transaction(root, 1);
299 btrfs_set_trans_block_group(trans, dir);
300 key.objectid = inode->i_ino;
301 key.offset = (u64)-1;
302 key.flags = (u32)-1;
303 while(1) {
304 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
305 if (ret < 0) {
306 err = ret;
307 goto out;
308 }
309 BUG_ON(ret == 0);
310 if (path->slots[0] == 0) {
311 err = -ENOENT;
312 goto out;
313 }
314 path->slots[0]--;
315 leaf = btrfs_buffer_leaf(path->nodes[0]);
316 btrfs_disk_key_to_cpu(&found_key,
317 &leaf->items[path->slots[0]].key);
318 found_type = btrfs_key_type(&found_key);
319 if (found_key.objectid != inode->i_ino) {
320 err = -ENOENT;
321 goto out;
322 }
323 if ((found_type != BTRFS_DIR_ITEM_KEY &&
324 found_type != BTRFS_DIR_INDEX_KEY) ||
325 (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
326 !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
327 err = -ENOTEMPTY;
328 goto out;
329 }
330 ret = btrfs_del_item(trans, root, path);
331 BUG_ON(ret);
332
333 if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
334 break;
335 btrfs_release_path(root, path);
336 }
337 ret = 0;
338 btrfs_release_path(root, path);
339
340 /* now the directory is empty */
341 err = btrfs_unlink_trans(trans, root, dir, dentry);
342 if (!err) {
343 inode->i_size = 0;
344 }
345out:
346 btrfs_release_path(root, path);
347 btrfs_free_path(path);
348 mutex_unlock(&root->fs_info->fs_mutex);
349 ret = btrfs_end_transaction(trans, root);
350 btrfs_btree_balance_dirty(root);
351 if (ret && !err)
352 err = ret;
353 return err;
354}
355
356static int btrfs_free_inode(struct btrfs_trans_handle *trans,
357 struct btrfs_root *root,
358 struct inode *inode)
359{
360 struct btrfs_path *path;
361 int ret;
362
363 clear_inode(inode);
364
365 path = btrfs_alloc_path();
366 BUG_ON(!path);
39279cc3
CM		 367 ret = btrfs_lookup_inode(trans, root, path,
368 &BTRFS_I(inode)->location, -1);
54aa1f4d
CM		 369 if (ret > 0)
370 ret = -ENOENT;
371 if (!ret)
372 ret = btrfs_del_item(trans, root, path);
39279cc3
CM		 373 btrfs_free_path(path);
374 return ret;
375}
376
39279cc3
CM		 377/*
378 * this can truncate away extent items, csum items and directory items.
379 * It starts at a high offset and removes keys until it can't find
380 * any higher than i_size.
381 *
382 * csum items that cross the new i_size are truncated to the new size
383 * as well.
384 */
385static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
386 struct btrfs_root *root,
387 struct inode *inode)
388{
389 int ret;
390 struct btrfs_path *path;
391 struct btrfs_key key;
392 struct btrfs_disk_key *found_key;
393 u32 found_type;
394 struct btrfs_leaf *leaf;
395 struct btrfs_file_extent_item *fi;
396 u64 extent_start = 0;
397 u64 extent_num_blocks = 0;
398 u64 item_end = 0;
399 int found_extent;
400 int del_item;
401
402 path = btrfs_alloc_path();
3c69faec 403 path->reada = -1;
39279cc3
CM		 404 BUG_ON(!path);
405 /* FIXME, add redo link to tree so we don't leak on crash */
406 key.objectid = inode->i_ino;
407 key.offset = (u64)-1;
408 key.flags = (u32)-1;
409 while(1) {
410 btrfs_init_path(path);
411 fi = NULL;
412 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
413 if (ret < 0) {
414 goto error;
415 }
416 if (ret > 0) {
417 BUG_ON(path->slots[0] == 0);
418 path->slots[0]--;
419 }
39279cc3
CM		 420 leaf = btrfs_buffer_leaf(path->nodes[0]);
421 found_key = &leaf->items[path->slots[0]].key;
422 found_type = btrfs_disk_key_type(found_key);
423
424 if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
425 break;
426 if (found_type != BTRFS_CSUM_ITEM_KEY &&
427 found_type != BTRFS_DIR_ITEM_KEY &&
428 found_type != BTRFS_DIR_INDEX_KEY &&
429 found_type != BTRFS_EXTENT_DATA_KEY)
430 break;
431
432 item_end = btrfs_disk_key_offset(found_key);
433 if (found_type == BTRFS_EXTENT_DATA_KEY) {
434 fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
435 path->slots[0],
436 struct btrfs_file_extent_item);
437 if (btrfs_file_extent_type(fi) !=
438 BTRFS_FILE_EXTENT_INLINE) {
439 item_end += btrfs_file_extent_num_blocks(fi) <<
440 inode->i_blkbits;
441 }
442 }
443 if (found_type == BTRFS_CSUM_ITEM_KEY) {
444 ret = btrfs_csum_truncate(trans, root, path,
445 inode->i_size);
446 BUG_ON(ret);
447 }
448 if (item_end < inode->i_size) {
449 if (found_type) {
450 btrfs_set_key_type(&key, found_type - 1);
451 continue;
452 }
453 break;
454 }
455 if (btrfs_disk_key_offset(found_key) >= inode->i_size)
456 del_item = 1;
457 else
458 del_item = 0;
459 found_extent = 0;
460
461 /* FIXME, shrink the extent if the ref count is only 1 */
462 if (found_type == BTRFS_EXTENT_DATA_KEY &&
463 btrfs_file_extent_type(fi) !=
464 BTRFS_FILE_EXTENT_INLINE) {
465 u64 num_dec;
466 if (!del_item) {
467 u64 orig_num_blocks =
468 btrfs_file_extent_num_blocks(fi);
469 extent_num_blocks = inode->i_size -
470 btrfs_disk_key_offset(found_key) +
471 root->blocksize - 1;
472 extent_num_blocks >>= inode->i_blkbits;
473 btrfs_set_file_extent_num_blocks(fi,
474 extent_num_blocks);
475 inode->i_blocks -= (orig_num_blocks -
476 extent_num_blocks) << 3;
ccd467d6 477 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3
CM		 478 } else {
479 extent_start =
480 btrfs_file_extent_disk_blocknr(fi);
481 extent_num_blocks =
482 btrfs_file_extent_disk_num_blocks(fi);
483 /* FIXME blocksize != 4096 */
484 num_dec = btrfs_file_extent_num_blocks(fi) << 3;
485 if (extent_start != 0) {
486 found_extent = 1;
487 inode->i_blocks -= num_dec;
488 }
489 }
490 }
491 if (del_item) {
492 ret = btrfs_del_item(trans, root, path);
54aa1f4d
CM		 493 if (ret)
494 goto error;
39279cc3
CM		 495 } else {
496 break;
497 }
498 btrfs_release_path(root, path);
499 if (found_extent) {
500 ret = btrfs_free_extent(trans, root, extent_start,
501 extent_num_blocks, 0);
502 BUG_ON(ret);
503 }
504 }
505 ret = 0;
506error:
507 btrfs_release_path(root, path);
508 btrfs_free_path(path);
509 inode->i_sb->s_dirt = 1;
510 return ret;
511}
512
513/*
514 * taken from block_truncate_page, but does cow as it zeros out
515 * any bytes left in the last page in the file.
516 */
517static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
518{
519 struct inode *inode = mapping->host;
520 unsigned blocksize = 1 << inode->i_blkbits;
521 pgoff_t index = from >> PAGE_CACHE_SHIFT;
522 unsigned offset = from & (PAGE_CACHE_SIZE-1);
523 struct page *page;
524 char *kaddr;
525 int ret = 0;
526 struct btrfs_root *root = BTRFS_I(inode)->root;
527 u64 alloc_hint = 0;
528 struct btrfs_key ins;
529 struct btrfs_trans_handle *trans;
530
531 if ((offset & (blocksize - 1)) == 0)
532 goto out;
533
534 ret = -ENOMEM;
535 page = grab_cache_page(mapping, index);
536 if (!page)
537 goto out;
538
539 if (!PageUptodate(page)) {
9ebefb18 540 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 541 lock_page(page);
542 if (!PageUptodate(page)) {
543 ret = -EIO;
544 goto out;
545 }
546 }
547 mutex_lock(&root->fs_info->fs_mutex);
548 trans = btrfs_start_transaction(root, 1);
549 btrfs_set_trans_block_group(trans, inode);
550
551 ret = btrfs_drop_extents(trans, root, inode,
552 page->index << PAGE_CACHE_SHIFT,
553 (page->index + 1) << PAGE_CACHE_SHIFT,
554 &alloc_hint);
54aa1f4d
CM		 555 if (ret)
556 goto out;
6702ed49 557 ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1, 0,
39279cc3 558 alloc_hint, (u64)-1, &ins, 1);
54aa1f4d
CM		 559 if (ret)
560 goto out;
39279cc3
CM		 561 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
562 page->index << PAGE_CACHE_SHIFT,
563 ins.objectid, 1, 1);
54aa1f4d
CM		 564 if (ret)
565 goto out;
39279cc3
CM		 566 SetPageChecked(page);
567 kaddr = kmap(page);
568 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
569 flush_dcache_page(page);
54aa1f4d 570 ret = btrfs_csum_file_block(trans, root, inode->i_ino,
39279cc3
CM		 571 page->index << PAGE_CACHE_SHIFT,
572 kaddr, PAGE_CACHE_SIZE);
573 kunmap(page);
574 btrfs_end_transaction(trans, root);
575 mutex_unlock(&root->fs_info->fs_mutex);
576
577 set_page_dirty(page);
578 unlock_page(page);
579 page_cache_release(page);
580out:
581 return ret;
582}
583
584static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
585{
586 struct inode *inode = dentry->d_inode;
587 int err;
588
589 err = inode_change_ok(inode, attr);
590 if (err)
591 return err;
592
593 if (S_ISREG(inode->i_mode) &&
594 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
595 struct btrfs_trans_handle *trans;
596 struct btrfs_root *root = BTRFS_I(inode)->root;
597 u64 mask = root->blocksize - 1;
598 u64 pos = (inode->i_size + mask) & ~mask;
599 u64 hole_size;
600
601 if (attr->ia_size <= pos)
602 goto out;
603
604 btrfs_truncate_page(inode->i_mapping, inode->i_size);
605
606 hole_size = (attr->ia_size - pos + mask) & ~mask;
607 hole_size >>= inode->i_blkbits;
608
609 mutex_lock(&root->fs_info->fs_mutex);
610 trans = btrfs_start_transaction(root, 1);
611 btrfs_set_trans_block_group(trans, inode);
612 err = btrfs_insert_file_extent(trans, root, inode->i_ino,
613 pos, 0, 0, hole_size);
39279cc3
CM		 614 btrfs_end_transaction(trans, root);
615 mutex_unlock(&root->fs_info->fs_mutex);
54aa1f4d
CM		 616 if (err)
617 return err;
39279cc3
CM		 618 }
619out:
620 err = inode_setattr(inode, attr);
621
622 return err;
623}
624void btrfs_delete_inode(struct inode *inode)
625{
626 struct btrfs_trans_handle *trans;
627 struct btrfs_root *root = BTRFS_I(inode)->root;
628 int ret;
629
630 truncate_inode_pages(&inode->i_data, 0);
631 if (is_bad_inode(inode)) {
632 goto no_delete;
633 }
634 inode->i_size = 0;
635 mutex_lock(&root->fs_info->fs_mutex);
636 trans = btrfs_start_transaction(root, 1);
637 btrfs_set_trans_block_group(trans, inode);
638 ret = btrfs_truncate_in_trans(trans, root, inode);
54aa1f4d
CM		 639 if (ret)
640 goto no_delete_lock;
641 ret = btrfs_free_inode(trans, root, inode);
642 if (ret)
643 goto no_delete_lock;
39279cc3
CM		 644 btrfs_end_transaction(trans, root);
645 mutex_unlock(&root->fs_info->fs_mutex);
646 btrfs_btree_balance_dirty(root);
647 return;
54aa1f4d
CM		 648
649no_delete_lock:
650 btrfs_end_transaction(trans, root);
651 mutex_unlock(&root->fs_info->fs_mutex);
652 btrfs_btree_balance_dirty(root);
39279cc3
CM		 653no_delete:
654 clear_inode(inode);
655}
656
657/*
658 * this returns the key found in the dir entry in the location pointer.
659 * If no dir entries were found, location->objectid is 0.
660 */
661static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
662 struct btrfs_key *location)
663{
664 const char *name = dentry->d_name.name;
665 int namelen = dentry->d_name.len;
666 struct btrfs_dir_item *di;
667 struct btrfs_path *path;
668 struct btrfs_root *root = BTRFS_I(dir)->root;
669 int ret;
670
671 path = btrfs_alloc_path();
672 BUG_ON(!path);
39279cc3
CM		 673 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
674 namelen, 0);
675 if (!di || IS_ERR(di)) {
676 location->objectid = 0;
677 ret = 0;
678 goto out;
679 }
680 btrfs_disk_key_to_cpu(location, &di->location);
681out:
682 btrfs_release_path(root, path);
683 btrfs_free_path(path);
684 return ret;
685}
686
687/*
688 * when we hit a tree root in a directory, the btrfs part of the inode
689 * needs to be changed to reflect the root directory of the tree root. This
690 * is kind of like crossing a mount point.
691 */
692static int fixup_tree_root_location(struct btrfs_root *root,
693 struct btrfs_key *location,
694 struct btrfs_root **sub_root)
695{
696 struct btrfs_path *path;
697 struct btrfs_root_item *ri;
698
699 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
700 return 0;
701 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
702 return 0;
703
704 path = btrfs_alloc_path();
705 BUG_ON(!path);
706 mutex_lock(&root->fs_info->fs_mutex);
707
708 *sub_root = btrfs_read_fs_root(root->fs_info, location);
709 if (IS_ERR(*sub_root))
710 return PTR_ERR(*sub_root);
711
712 ri = &(*sub_root)->root_item;
713 location->objectid = btrfs_root_dirid(ri);
714 location->flags = 0;
715 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
716 location->offset = 0;
717
718 btrfs_free_path(path);
719 mutex_unlock(&root->fs_info->fs_mutex);
720 return 0;
721}
722
723static int btrfs_init_locked_inode(struct inode *inode, void *p)
724{
725 struct btrfs_iget_args *args = p;
726 inode->i_ino = args->ino;
727 BTRFS_I(inode)->root = args->root;
728 return 0;
729}
730
731static int btrfs_find_actor(struct inode *inode, void *opaque)
732{
733 struct btrfs_iget_args *args = opaque;
734 return (args->ino == inode->i_ino &&
735 args->root == BTRFS_I(inode)->root);
736}
737
738struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
739 struct btrfs_root *root)
740{
741 struct inode *inode;
742 struct btrfs_iget_args args;
743 args.ino = objectid;
744 args.root = root;
745
746 inode = iget5_locked(s, objectid, btrfs_find_actor,
747 btrfs_init_locked_inode,
748 (void *)&args);
749 return inode;
750}
751
752static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
753 struct nameidata *nd)
754{
755 struct inode * inode;
756 struct btrfs_inode *bi = BTRFS_I(dir);
757 struct btrfs_root *root = bi->root;
758 struct btrfs_root *sub_root = root;
759 struct btrfs_key location;
760 int ret;
761
762 if (dentry->d_name.len > BTRFS_NAME_LEN)
763 return ERR_PTR(-ENAMETOOLONG);
764 mutex_lock(&root->fs_info->fs_mutex);
765 ret = btrfs_inode_by_name(dir, dentry, &location);
766 mutex_unlock(&root->fs_info->fs_mutex);
767 if (ret < 0)
768 return ERR_PTR(ret);
769 inode = NULL;
770 if (location.objectid) {
771 ret = fixup_tree_root_location(root, &location, &sub_root);
772 if (ret < 0)
773 return ERR_PTR(ret);
774 if (ret > 0)
775 return ERR_PTR(-ENOENT);
776 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
777 sub_root);
778 if (!inode)
779 return ERR_PTR(-EACCES);
780 if (inode->i_state & I_NEW) {
781 /* the inode and parent dir are two different roots */
782 if (sub_root != root) {
783 igrab(inode);
784 sub_root->inode = inode;
785 }
786 BTRFS_I(inode)->root = sub_root;
787 memcpy(&BTRFS_I(inode)->location, &location,
788 sizeof(location));
789 btrfs_read_locked_inode(inode);
790 unlock_new_inode(inode);
791 }
792 }
793 return d_splice_alias(inode, dentry);
794}
795
39279cc3
CM		 796static unsigned char btrfs_filetype_table[] = {
797 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
798};
799
800static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
801{
802 struct inode *inode = filp->f_path.dentry->d_inode;
803 struct btrfs_root *root = BTRFS_I(inode)->root;
804 struct btrfs_item *item;
805 struct btrfs_dir_item *di;
806 struct btrfs_key key;
807 struct btrfs_path *path;
808 int ret;
809 u32 nritems;
810 struct btrfs_leaf *leaf;
811 int slot;
812 int advance;
813 unsigned char d_type;
814 int over = 0;
815 u32 di_cur;
816 u32 di_total;
817 u32 di_len;
818 int key_type = BTRFS_DIR_INDEX_KEY;
819
820 /* FIXME, use a real flag for deciding about the key type */
821 if (root->fs_info->tree_root == root)
822 key_type = BTRFS_DIR_ITEM_KEY;
823 mutex_lock(&root->fs_info->fs_mutex);
824 key.objectid = inode->i_ino;
825 key.flags = 0;
826 btrfs_set_key_type(&key, key_type);
827 key.offset = filp->f_pos;
828 path = btrfs_alloc_path();
3c69faec 829 path->reada = 1;
39279cc3
CM		 830 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
831 if (ret < 0)
832 goto err;
833 advance = 0;
39279cc3
CM		 834 while(1) {
835 leaf = btrfs_buffer_leaf(path->nodes[0]);
836 nritems = btrfs_header_nritems(&leaf->header);
837 slot = path->slots[0];
838 if (advance || slot >= nritems) {
839 if (slot >= nritems -1) {
39279cc3
CM		 840 ret = btrfs_next_leaf(root, path);
841 if (ret)
842 break;
843 leaf = btrfs_buffer_leaf(path->nodes[0]);
844 nritems = btrfs_header_nritems(&leaf->header);
845 slot = path->slots[0];
846 } else {
847 slot++;
848 path->slots[0]++;
849 }
850 }
851 advance = 1;
852 item = leaf->items + slot;
853 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
854 break;
855 if (btrfs_disk_key_type(&item->key) != key_type)
856 break;
857 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
858 continue;
859 filp->f_pos = btrfs_disk_key_offset(&item->key);
860 advance = 1;
861 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
862 di_cur = 0;
863 di_total = btrfs_item_size(leaf->items + slot);
864 while(di_cur < di_total) {
865 d_type = btrfs_filetype_table[btrfs_dir_type(di)];
866 over = filldir(dirent, (const char *)(di + 1),
867 btrfs_dir_name_len(di),
868 btrfs_disk_key_offset(&item->key),
869 btrfs_disk_key_objectid(&di->location),
870 d_type);
871 if (over)
872 goto nopos;
873 di_len = btrfs_dir_name_len(di) + sizeof(*di);
874 di_cur += di_len;
875 di = (struct btrfs_dir_item *)((char *)di + di_len);
876 }
877 }
878 filp->f_pos++;
879nopos:
880 ret = 0;
881err:
882 btrfs_release_path(root, path);
883 btrfs_free_path(path);
884 mutex_unlock(&root->fs_info->fs_mutex);
885 return ret;
886}
887
888int btrfs_write_inode(struct inode *inode, int wait)
889{
890 struct btrfs_root *root = BTRFS_I(inode)->root;
891 struct btrfs_trans_handle *trans;
892 int ret = 0;
893
894 if (wait) {
895 mutex_lock(&root->fs_info->fs_mutex);
896 trans = btrfs_start_transaction(root, 1);
897 btrfs_set_trans_block_group(trans, inode);
898 ret = btrfs_commit_transaction(trans, root);
899 mutex_unlock(&root->fs_info->fs_mutex);
900 }
901 return ret;
902}
903
904/*
54aa1f4d 905 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 906 * inode changes. But, it is most likely to find the inode in cache.
907 * FIXME, needs more benchmarking...there are no reasons other than performance
908 * to keep or drop this code.
909 */
910void btrfs_dirty_inode(struct inode *inode)
911{
912 struct btrfs_root *root = BTRFS_I(inode)->root;
913 struct btrfs_trans_handle *trans;
914
915 mutex_lock(&root->fs_info->fs_mutex);
916 trans = btrfs_start_transaction(root, 1);
917 btrfs_set_trans_block_group(trans, inode);
918 btrfs_update_inode(trans, root, inode);
919 btrfs_end_transaction(trans, root);
920 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 921}
922
923static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
924 struct btrfs_root *root,
925 u64 objectid,
926 struct btrfs_block_group_cache *group,
927 int mode)
928{
929 struct inode *inode;
930 struct btrfs_inode_item inode_item;
931 struct btrfs_key *location;
932 int ret;
933 int owner;
934
935 inode = new_inode(root->fs_info->sb);
936 if (!inode)
937 return ERR_PTR(-ENOMEM);
938
939 BTRFS_I(inode)->root = root;
940 if (mode & S_IFDIR)
941 owner = 0;
942 else
943 owner = 1;
944 group = btrfs_find_block_group(root, group, 0, 0, owner);
945 BTRFS_I(inode)->block_group = group;
946
947 inode->i_uid = current->fsuid;
948 inode->i_gid = current->fsgid;
949 inode->i_mode = mode;
950 inode->i_ino = objectid;
951 inode->i_blocks = 0;
952 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
953 fill_inode_item(&inode_item, inode);
954 location = &BTRFS_I(inode)->location;
955 location->objectid = objectid;
956 location->flags = 0;
957 location->offset = 0;
958 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
959
960 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
54aa1f4d
CM		 961 if (ret)
962 return ERR_PTR(ret);
39279cc3
CM		 963 insert_inode_hash(inode);
964 return inode;
965}
966
967static inline u8 btrfs_inode_type(struct inode *inode)
968{
969 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
970}
971
972static int btrfs_add_link(struct btrfs_trans_handle *trans,
973 struct dentry *dentry, struct inode *inode)
974{
975 int ret;
976 struct btrfs_key key;
977 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 978 struct inode *parent_inode;
39279cc3
CM		 979 key.objectid = inode->i_ino;
980 key.flags = 0;
981 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
982 key.offset = 0;
983
984 ret = btrfs_insert_dir_item(trans, root,
985 dentry->d_name.name, dentry->d_name.len,
986 dentry->d_parent->d_inode->i_ino,
987 &key, btrfs_inode_type(inode));
988 if (ret == 0) {
79c44584
CM		 989 parent_inode = dentry->d_parent->d_inode;
990 parent_inode->i_size += dentry->d_name.len * 2;
991 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 992 ret = btrfs_update_inode(trans, root,
993 dentry->d_parent->d_inode);
994 }
995 return ret;
996}
997
998static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
999 struct dentry *dentry, struct inode *inode)
1000{
1001 int err = btrfs_add_link(trans, dentry, inode);
1002 if (!err) {
1003 d_instantiate(dentry, inode);
1004 return 0;
1005 }
1006 if (err > 0)
1007 err = -EEXIST;
1008 return err;
1009}
1010
618e21d5
JB		 1011static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1012 int mode, dev_t rdev)
1013{
1014 struct btrfs_trans_handle *trans;
1015 struct btrfs_root *root = BTRFS_I(dir)->root;
1016 struct inode *inode;
1017 int err;
1018 int drop_inode = 0;
1019 u64 objectid;
1020
1021 if (!new_valid_dev(rdev))
1022 return -EINVAL;
1023
1024 mutex_lock(&root->fs_info->fs_mutex);
1025 trans = btrfs_start_transaction(root, 1);
1026 btrfs_set_trans_block_group(trans, dir);
1027
1028 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1029 if (err) {
1030 err = -ENOSPC;
1031 goto out_unlock;
1032 }
1033
1034 inode = btrfs_new_inode(trans, root, objectid,
1035 BTRFS_I(dir)->block_group, mode);
1036 err = PTR_ERR(inode);
1037 if (IS_ERR(inode))
1038 goto out_unlock;
1039
1040 btrfs_set_trans_block_group(trans, inode);
1041 err = btrfs_add_nondir(trans, dentry, inode);
1042 if (err)
1043 drop_inode = 1;
1044 else {
1045 inode->i_op = &btrfs_special_inode_operations;
1046 init_special_inode(inode, inode->i_mode, rdev);
1047 }
1048 dir->i_sb->s_dirt = 1;
1049 btrfs_update_inode_block_group(trans, inode);
1050 btrfs_update_inode_block_group(trans, dir);
1051out_unlock:
1052 btrfs_end_transaction(trans, root);
1053 mutex_unlock(&root->fs_info->fs_mutex);
1054
1055 if (drop_inode) {
1056 inode_dec_link_count(inode);
1057 iput(inode);
1058 }
1059 btrfs_btree_balance_dirty(root);
1060 return err;
1061}
1062
39279cc3
CM		 1063static int btrfs_create(struct inode *dir, struct dentry *dentry,
1064 int mode, struct nameidata *nd)
1065{
1066 struct btrfs_trans_handle *trans;
1067 struct btrfs_root *root = BTRFS_I(dir)->root;
1068 struct inode *inode;
1069 int err;
1070 int drop_inode = 0;
1071 u64 objectid;
1072
1073 mutex_lock(&root->fs_info->fs_mutex);
1074 trans = btrfs_start_transaction(root, 1);
1075 btrfs_set_trans_block_group(trans, dir);
1076
1077 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1078 if (err) {
1079 err = -ENOSPC;
1080 goto out_unlock;
1081 }
1082
1083 inode = btrfs_new_inode(trans, root, objectid,
1084 BTRFS_I(dir)->block_group, mode);
1085 err = PTR_ERR(inode);
1086 if (IS_ERR(inode))
1087 goto out_unlock;
1088
1089 btrfs_set_trans_block_group(trans, inode);
1090 err = btrfs_add_nondir(trans, dentry, inode);
1091 if (err)
1092 drop_inode = 1;
1093 else {
1094 inode->i_mapping->a_ops = &btrfs_aops;
1095 inode->i_fop = &btrfs_file_operations;
1096 inode->i_op = &btrfs_file_inode_operations;
1097 }
1098 dir->i_sb->s_dirt = 1;
1099 btrfs_update_inode_block_group(trans, inode);
1100 btrfs_update_inode_block_group(trans, dir);
1101out_unlock:
1102 btrfs_end_transaction(trans, root);
1103 mutex_unlock(&root->fs_info->fs_mutex);
1104
1105 if (drop_inode) {
1106 inode_dec_link_count(inode);
1107 iput(inode);
1108 }
1109 btrfs_btree_balance_dirty(root);
1110 return err;
1111}
1112
1113static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1114 struct dentry *dentry)
1115{
1116 struct btrfs_trans_handle *trans;
1117 struct btrfs_root *root = BTRFS_I(dir)->root;
1118 struct inode *inode = old_dentry->d_inode;
1119 int err;
1120 int drop_inode = 0;
1121
1122 if (inode->i_nlink == 0)
1123 return -ENOENT;
1124
1125 inc_nlink(inode);
1126 mutex_lock(&root->fs_info->fs_mutex);
1127 trans = btrfs_start_transaction(root, 1);
1128 btrfs_set_trans_block_group(trans, dir);
1129 atomic_inc(&inode->i_count);
1130 err = btrfs_add_nondir(trans, dentry, inode);
1131 if (err)
1132 drop_inode = 1;
1133 dir->i_sb->s_dirt = 1;
1134 btrfs_update_inode_block_group(trans, dir);
54aa1f4d
CM		 1135 err = btrfs_update_inode(trans, root, inode);
1136 if (err)
1137 drop_inode = 1;
39279cc3
CM		 1138
1139 btrfs_end_transaction(trans, root);
1140 mutex_unlock(&root->fs_info->fs_mutex);
1141
1142 if (drop_inode) {
1143 inode_dec_link_count(inode);
1144 iput(inode);
1145 }
1146 btrfs_btree_balance_dirty(root);
1147 return err;
1148}
1149
1150static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
1151 struct btrfs_root *root,
1152 u64 objectid, u64 dirid)
1153{
1154 int ret;
1155 char buf[2];
1156 struct btrfs_key key;
1157
1158 buf[0] = '.';
1159 buf[1] = '.';
1160
1161 key.objectid = objectid;
1162 key.offset = 0;
1163 key.flags = 0;
1164 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1165
1166 ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
1167 &key, BTRFS_FT_DIR);
1168 if (ret)
1169 goto error;
1170 key.objectid = dirid;
1171 ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
1172 &key, BTRFS_FT_DIR);
1173 if (ret)
1174 goto error;
1175error:
1176 return ret;
1177}
1178
1179static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1180{
1181 struct inode *inode;
1182 struct btrfs_trans_handle *trans;
1183 struct btrfs_root *root = BTRFS_I(dir)->root;
1184 int err = 0;
1185 int drop_on_err = 0;
1186 u64 objectid;
1187
1188 mutex_lock(&root->fs_info->fs_mutex);
1189 trans = btrfs_start_transaction(root, 1);
1190 btrfs_set_trans_block_group(trans, dir);
1191 if (IS_ERR(trans)) {
1192 err = PTR_ERR(trans);
1193 goto out_unlock;
1194 }
1195
1196 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1197 if (err) {
1198 err = -ENOSPC;
1199 goto out_unlock;
1200 }
1201
1202 inode = btrfs_new_inode(trans, root, objectid,
1203 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1204 if (IS_ERR(inode)) {
1205 err = PTR_ERR(inode);
1206 goto out_fail;
1207 }
1208 drop_on_err = 1;
1209 inode->i_op = &btrfs_dir_inode_operations;
1210 inode->i_fop = &btrfs_dir_file_operations;
1211 btrfs_set_trans_block_group(trans, inode);
1212
1213 err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
1214 if (err)
1215 goto out_fail;
1216
1217 inode->i_size = 6;
1218 err = btrfs_update_inode(trans, root, inode);
1219 if (err)
1220 goto out_fail;
1221 err = btrfs_add_link(trans, dentry, inode);
1222 if (err)
1223 goto out_fail;
1224 d_instantiate(dentry, inode);
1225 drop_on_err = 0;
1226 dir->i_sb->s_dirt = 1;
1227 btrfs_update_inode_block_group(trans, inode);
1228 btrfs_update_inode_block_group(trans, dir);
1229
1230out_fail:
1231 btrfs_end_transaction(trans, root);
1232out_unlock:
1233 mutex_unlock(&root->fs_info->fs_mutex);
1234 if (drop_on_err)
1235 iput(inode);
1236 btrfs_btree_balance_dirty(root);
1237 return err;
1238}
1239
1240/*
1241 * FIBMAP and others want to pass in a fake buffer head. They need to
1242 * use BTRFS_GET_BLOCK_NO_DIRECT to make sure we don't try to memcpy
1243 * any packed file data into the fake bh
1244 */
1245#define BTRFS_GET_BLOCK_NO_CREATE 0
1246#define BTRFS_GET_BLOCK_CREATE 1
1247#define BTRFS_GET_BLOCK_NO_DIRECT 2
1248
1249/*
1250 * FIXME create==1 doe not work.
1251 */
1252static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
1253 struct buffer_head *result, int create)
1254{
1255 int ret;
1256 int err = 0;
1257 u64 blocknr;
1258 u64 extent_start = 0;
1259 u64 extent_end = 0;
1260 u64 objectid = inode->i_ino;
1261 u32 found_type;
1262 u64 alloc_hint = 0;
1263 struct btrfs_path *path;
1264 struct btrfs_root *root = BTRFS_I(inode)->root;
1265 struct btrfs_file_extent_item *item;
1266 struct btrfs_leaf *leaf;
1267 struct btrfs_disk_key *found_key;
1268 struct btrfs_trans_handle *trans = NULL;
1269
1270 path = btrfs_alloc_path();
1271 BUG_ON(!path);
39279cc3 1272 if (create & BTRFS_GET_BLOCK_CREATE) {
9ebefb18
CM		 1273 /*
1274 * danger!, this only works if the page is properly up
1275 * to date somehow
1276 */
39279cc3
CM		 1277 trans = btrfs_start_transaction(root, 1);
1278 if (!trans) {
1279 err = -ENOMEM;
1280 goto out;
1281 }
1282 ret = btrfs_drop_extents(trans, root, inode,
1283 iblock << inode->i_blkbits,
1284 (iblock + 1) << inode->i_blkbits,
1285 &alloc_hint);
1286 BUG_ON(ret);
1287 }
1288
1289 ret = btrfs_lookup_file_extent(NULL, root, path,
f1ace244 1290 objectid,
39279cc3
CM		 1291 iblock << inode->i_blkbits, 0);
1292 if (ret < 0) {
1293 err = ret;
1294 goto out;
1295 }
1296
1297 if (ret != 0) {
1298 if (path->slots[0] == 0) {
1299 btrfs_release_path(root, path);
1300 goto not_found;
1301 }
1302 path->slots[0]--;
1303 }
1304
1305 item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
1306 struct btrfs_file_extent_item);
1307 leaf = btrfs_buffer_leaf(path->nodes[0]);
1308 blocknr = btrfs_file_extent_disk_blocknr(item);
1309 blocknr += btrfs_file_extent_offset(item);
1310
1311 /* are we inside the extent that was found? */
1312 found_key = &leaf->items[path->slots[0]].key;
1313 found_type = btrfs_disk_key_type(found_key);
1314 if (btrfs_disk_key_objectid(found_key) != objectid ||
1315 found_type != BTRFS_EXTENT_DATA_KEY) {
1316 extent_end = 0;
1317 extent_start = 0;
1318 goto not_found;
1319 }
1320 found_type = btrfs_file_extent_type(item);
1321 extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
1322 if (found_type == BTRFS_FILE_EXTENT_REG) {
1323 extent_start = extent_start >> inode->i_blkbits;
1324 extent_end = extent_start + btrfs_file_extent_num_blocks(item);
1325 err = 0;
1326 if (btrfs_file_extent_disk_blocknr(item) == 0)
1327 goto out;
1328 if (iblock >= extent_start && iblock < extent_end) {
1329 btrfs_map_bh_to_logical(root, result, blocknr +
1330 iblock - extent_start);
1331 goto out;
1332 }
1333 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1334 char *ptr;
1335 char *map;
1336 u32 size;
1337
1338 if (create & BTRFS_GET_BLOCK_NO_DIRECT) {
1339 err = -EINVAL;
1340 goto out;
1341 }
1342 size = btrfs_file_extent_inline_len(leaf->items +
1343 path->slots[0]);
1344 extent_end = (extent_start + size) >> inode->i_blkbits;
1345 extent_start >>= inode->i_blkbits;
1346 if (iblock < extent_start || iblock > extent_end) {
1347 goto not_found;
1348 }
1349 ptr = btrfs_file_extent_inline_start(item);
1350 map = kmap(result->b_page);
1351 memcpy(map, ptr, size);
1352 memset(map + size, 0, PAGE_CACHE_SIZE - size);
1353 flush_dcache_page(result->b_page);
1354 kunmap(result->b_page);
1355 set_buffer_uptodate(result);
1356 SetPageChecked(result->b_page);
1357 btrfs_map_bh_to_logical(root, result, 0);
1358 }
1359not_found:
1360 if (create & BTRFS_GET_BLOCK_CREATE) {
1361 struct btrfs_key ins;
1362 ret = btrfs_alloc_extent(trans, root, inode->i_ino,
6702ed49 1363 1, 0, alloc_hint, (u64)-1,
39279cc3 1364 &ins, 1);
54aa1f4d
CM		 1365 if (ret) {
1366 err = ret;
1367 goto out;
1368 }
39279cc3
CM		 1369 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
1370 iblock << inode->i_blkbits,
1371 ins.objectid, ins.offset,
1372 ins.offset);
54aa1f4d
CM		 1373 if (ret) {
1374 err = ret;
1375 goto out;
1376 }
39279cc3
CM		 1377 btrfs_map_bh_to_logical(root, result, ins.objectid);
1378 }
1379out:
54aa1f4d
CM		 1380 if (trans) {
1381 ret = btrfs_end_transaction(trans, root);
1382 if (!err)
1383 err = ret;
1384 }
39279cc3
CM		 1385 btrfs_free_path(path);
1386 return err;
1387}
1388
1389int btrfs_get_block(struct inode *inode, sector_t iblock,
1390 struct buffer_head *result, int create)
1391{
1392 int err;
1393 struct btrfs_root *root = BTRFS_I(inode)->root;
1394 mutex_lock(&root->fs_info->fs_mutex);
1395 err = btrfs_get_block_lock(inode, iblock, result, create);
1396 mutex_unlock(&root->fs_info->fs_mutex);
1397 return err;
1398}
1399
54aa1f4d
CM		 1400static int btrfs_get_block_csum(struct inode *inode, sector_t iblock,
1401 struct buffer_head *result, int create)
9ebefb18
CM		 1402{
1403 int ret;
1404 struct btrfs_root *root = BTRFS_I(inode)->root;
1405 struct page *page = result->b_page;
1406 u64 offset = (page->index << PAGE_CACHE_SHIFT) + bh_offset(result);
1407 struct btrfs_csum_item *item;
1408 struct btrfs_path *path = NULL;
1409
1410 mutex_lock(&root->fs_info->fs_mutex);
1411 ret = btrfs_get_block_lock(inode, iblock, result, create);
1412 if (ret)
1413 goto out;
1414
1415 path = btrfs_alloc_path();
1416 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, offset, 0);
1417 if (IS_ERR(item)) {
1418 ret = PTR_ERR(item);
1419 /* a csum that isn't present is a preallocated region. */
1420 if (ret == -ENOENT || ret == -EFBIG)
1421 ret = 0;
54aa1f4d 1422 result->b_private = NULL;
9ebefb18
CM		 1423 goto out;
1424 }
1425 memcpy((char *)&result->b_private, &item->csum, BTRFS_CRC32_SIZE);
9ebefb18
CM		 1426out:
1427 if (path)
1428 btrfs_free_path(path);
1429 mutex_unlock(&root->fs_info->fs_mutex);
1430 return ret;
1431}
1432
39279cc3
CM		 1433static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock,
1434 struct buffer_head *result, int create)
1435{
1436 struct btrfs_root *root = BTRFS_I(inode)->root;
1437 mutex_lock(&root->fs_info->fs_mutex);
1438 btrfs_get_block_lock(inode, iblock, result, BTRFS_GET_BLOCK_NO_DIRECT);
1439 mutex_unlock(&root->fs_info->fs_mutex);
1440 return 0;
1441}
1442
1443static sector_t btrfs_bmap(struct address_space *as, sector_t block)
1444{
1445 return generic_block_bmap(as, block, btrfs_get_block_bmap);
1446}
1447
1448static int btrfs_prepare_write(struct file *file, struct page *page,
1449 unsigned from, unsigned to)
1450{
1451 return block_prepare_write(page, from, to, btrfs_get_block);
1452}
1453
9ebefb18
CM		 1454static void buffer_io_error(struct buffer_head *bh)
1455{
1456 char b[BDEVNAME_SIZE];
1457
1458 printk(KERN_ERR "Buffer I/O error on device %s, logical block %Lu\n",
1459 bdevname(bh->b_bdev, b),
1460 (unsigned long long)bh->b_blocknr);
1461}
1462
1463/*
1464 * I/O completion handler for block_read_full_page() - pages
1465 * which come unlocked at the end of I/O.
1466 */
1467static void btrfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
39279cc3 1468{
9ebefb18
CM		 1469 unsigned long flags;
1470 struct buffer_head *first;
1471 struct buffer_head *tmp;
1472 struct page *page;
1473 int page_uptodate = 1;
1474 struct inode *inode;
1475 int ret;
1476
1477 BUG_ON(!buffer_async_read(bh));
1478
1479 page = bh->b_page;
1480 inode = page->mapping->host;
1481 if (uptodate) {
1482 void *kaddr;
1483 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
1484 if (bh->b_private) {
1485 char csum[BTRFS_CRC32_SIZE];
1486 kaddr = kmap_atomic(page, KM_IRQ0);
1487 ret = btrfs_csum_data(root, kaddr + bh_offset(bh),
1488 bh->b_size, csum);
1489 BUG_ON(ret);
1490 if (memcmp(csum, &bh->b_private, BTRFS_CRC32_SIZE)) {
1491 u64 offset;
1492 offset = (page->index << PAGE_CACHE_SHIFT) +
1493 bh_offset(bh);
1494 printk("btrfs csum failed ino %lu off %llu\n",
1495 page->mapping->host->i_ino,
1496 (unsigned long long)offset);
1497 memset(kaddr + bh_offset(bh), 1, bh->b_size);
1498 flush_dcache_page(page);
9ebefb18
CM		 1499 }
1500 kunmap_atomic(kaddr, KM_IRQ0);
1501 }
1502 set_buffer_uptodate(bh);
1503 } else {
1504 clear_buffer_uptodate(bh);
1505 if (printk_ratelimit())
1506 buffer_io_error(bh);
1507 SetPageError(page);
1508 }
1509
1510 /*
1511 * Be _very_ careful from here on. Bad things can happen if
1512 * two buffer heads end IO at almost the same time and both
1513 * decide that the page is now completely done.
1514 */
1515 first = page_buffers(page);
1516 local_irq_save(flags);
1517 bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
1518 clear_buffer_async_read(bh);
1519 unlock_buffer(bh);
1520 tmp = bh;
1521 do {
1522 if (!buffer_uptodate(tmp))
1523 page_uptodate = 0;
1524 if (buffer_async_read(tmp)) {
1525 BUG_ON(!buffer_locked(tmp));
1526 goto still_busy;
1527 }
1528 tmp = tmp->b_this_page;
1529 } while (tmp != bh);
1530 bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
1531 local_irq_restore(flags);
1532
1533 /*
1534 * If none of the buffers had errors and they are all
1535 * uptodate then we can set the page uptodate.
1536 */
1537 if (page_uptodate && !PageError(page))
1538 SetPageUptodate(page);
1539 unlock_page(page);
1540 return;
1541
1542still_busy:
1543 bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
1544 local_irq_restore(flags);
1545 return;
1546}
1547
1548/*
1549 * Generic "read page" function for block devices that have the normal
1550 * get_block functionality. This is most of the block device filesystems.
1551 * Reads the page asynchronously --- the unlock_buffer() and
1552 * set/clear_buffer_uptodate() functions propagate buffer state into the
1553 * page struct once IO has completed.
1554 */
1555int btrfs_readpage(struct file *file, struct page *page)
1556{
1557 struct inode *inode = page->mapping->host;
1558 sector_t iblock, lblock;
1559 struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE];
1560 unsigned int blocksize;
1561 int nr, i;
1562 int fully_mapped = 1;
1563
1564 BUG_ON(!PageLocked(page));
1565 blocksize = 1 << inode->i_blkbits;
1566 if (!page_has_buffers(page))
1567 create_empty_buffers(page, blocksize, 0);
1568 head = page_buffers(page);
1569
1570 iblock = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
1571 lblock = (i_size_read(inode)+blocksize-1) >> inode->i_blkbits;
1572 bh = head;
1573 nr = 0;
1574 i = 0;
1575
1576 do {
1577 if (buffer_uptodate(bh))
1578 continue;
1579
1580 if (!buffer_mapped(bh)) {
1581 int err = 0;
1582
1583 fully_mapped = 0;
1584 if (iblock < lblock) {
1585 WARN_ON(bh->b_size != blocksize);
1586 err = btrfs_get_block_csum(inode, iblock,
1587 bh, 0);
1588 if (err)
1589 SetPageError(page);
1590 }
1591 if (!buffer_mapped(bh)) {
1592 void *kaddr = kmap_atomic(page, KM_USER0);
1593 memset(kaddr + i * blocksize, 0, blocksize);
1594 flush_dcache_page(page);
1595 kunmap_atomic(kaddr, KM_USER0);
1596 if (!err)
1597 set_buffer_uptodate(bh);
1598 continue;
1599 }
1600 /*
1601 * get_block() might have updated the buffer
1602 * synchronously
1603 */
1604 if (buffer_uptodate(bh))
1605 continue;
1606 }
1607 arr[nr++] = bh;
1608 } while (i++, iblock++, (bh = bh->b_this_page) != head);
1609
1610 if (fully_mapped)
1611 SetPageMappedToDisk(page);
1612
1613 if (!nr) {
1614 /*
1615 * All buffers are uptodate - we can set the page uptodate
1616 * as well. But not if get_block() returned an error.
1617 */
1618 if (!PageError(page))
1619 SetPageUptodate(page);
1620 unlock_page(page);
1621 return 0;
1622 }
1623
1624 /* Stage two: lock the buffers */
1625 for (i = 0; i < nr; i++) {
1626 bh = arr[i];
1627 lock_buffer(bh);
1628 bh->b_end_io = btrfs_end_buffer_async_read;
1629 set_buffer_async_read(bh);
1630 }
1631
1632 /*
1633 * Stage 3: start the IO. Check for uptodateness
1634 * inside the buffer lock in case another process reading
1635 * the underlying blockdev brought it uptodate (the sct fix).
1636 */
1637 for (i = 0; i < nr; i++) {
1638 bh = arr[i];
1639 if (buffer_uptodate(bh))
1640 btrfs_end_buffer_async_read(bh, 1);
1641 else
1642 submit_bh(READ, bh);
1643 }
1644 return 0;
39279cc3
CM		 1645}
1646
1647/*
1648 * Aside from a tiny bit of packed file data handling, this is the
1649 * same as the generic code.
1650 *
1651 * While block_write_full_page is writing back the dirty buffers under
1652 * the page lock, whoever dirtied the buffers may decide to clean them
1653 * again at any time. We handle that by only looking at the buffer
1654 * state inside lock_buffer().
1655 *
1656 * If block_write_full_page() is called for regular writeback
1657 * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a
1658 * locked buffer. This only can happen if someone has written the buffer
1659 * directly, with submit_bh(). At the address_space level PageWriteback
1660 * prevents this contention from occurring.
1661 */
1662static int __btrfs_write_full_page(struct inode *inode, struct page *page,
1663 struct writeback_control *wbc)
1664{
1665 int err;
1666 sector_t block;
1667 sector_t last_block;
1668 struct buffer_head *bh, *head;
1669 const unsigned blocksize = 1 << inode->i_blkbits;
1670 int nr_underway = 0;
9ebefb18 1671 struct btrfs_root *root = BTRFS_I(inode)->root;
39279cc3
CM		 1672
1673 BUG_ON(!PageLocked(page));
1674
1675 last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
1676
8c2383c3
CM		 1677 /* no csumming allowed when from PF_MEMALLOC */
1678 if (current->flags & PF_MEMALLOC) {
1679 redirty_page_for_writepage(wbc, page);
1680 unlock_page(page);
1681 return 0;
1682 }
1683
39279cc3
CM		 1684 if (!page_has_buffers(page)) {
1685 create_empty_buffers(page, blocksize,
1686 (1 << BH_Dirty)|(1 << BH_Uptodate));
1687 }
1688
1689 /*
1690 * Be very careful. We have no exclusion from __set_page_dirty_buffers
1691 * here, and the (potentially unmapped) buffers may become dirty at
1692 * any time. If a buffer becomes dirty here after we've inspected it
1693 * then we just miss that fact, and the page stays dirty.
1694 *
1695 * Buffers outside i_size may be dirtied by __set_page_dirty_buffers;
1696 * handle that here by just cleaning them.
1697 */
1698
1699 block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
1700 head = page_buffers(page);
1701 bh = head;
1702
1703 /*
1704 * Get all the dirty buffers mapped to disk addresses and
1705 * handle any aliases from the underlying blockdev's mapping.
1706 */
1707 do {
1708 if (block > last_block) {
1709 /*
1710 * mapped buffers outside i_size will occur, because
1711 * this page can be outside i_size when there is a
1712 * truncate in progress.
1713 */
1714 /*
1715 * The buffer was zeroed by block_write_full_page()
1716 */
1717 clear_buffer_dirty(bh);
1718 set_buffer_uptodate(bh);
1719 } else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
1720 WARN_ON(bh->b_size != blocksize);
1721 err = btrfs_get_block(inode, block, bh, 0);
1722 if (err) {
1723 goto recover;
1724 }
1725 if (buffer_new(bh)) {
1726 /* blockdev mappings never come here */
1727 clear_buffer_new(bh);
1728 }
1729 }
1730 bh = bh->b_this_page;
1731 block++;
1732 } while (bh != head);
1733
1734 do {
1735 if (!buffer_mapped(bh))
1736 continue;
1737 /*
1738 * If it's a fully non-blocking write attempt and we cannot
1739 * lock the buffer then redirty the page. Note that this can
1740 * potentially cause a busy-wait loop from pdflush and kswapd
1741 * activity, but those code paths have their own higher-level
1742 * throttling.
1743 */
1744 if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
1745 lock_buffer(bh);
1746 } else if (test_set_buffer_locked(bh)) {
1747 redirty_page_for_writepage(wbc, page);
1748 continue;
1749 }
1750 if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) {
9ebefb18
CM		 1751 struct btrfs_trans_handle *trans;
1752 int ret;
1753 u64 off = page->index << PAGE_CACHE_SHIFT;
1754 char *kaddr;
1755
1756 off += bh_offset(bh);
1757 mutex_lock(&root->fs_info->fs_mutex);
1758 trans = btrfs_start_transaction(root, 1);
1759 btrfs_set_trans_block_group(trans, inode);
1760 kaddr = kmap(page);
54aa1f4d 1761 btrfs_csum_file_block(trans, root, inode->i_ino,
9ebefb18
CM		 1762 off, kaddr + bh_offset(bh),
1763 bh->b_size);
1764 kunmap(page);
9ebefb18
CM		 1765 ret = btrfs_end_transaction(trans, root);
1766 BUG_ON(ret);
1767 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1768 mark_buffer_async_write(bh);
1769 } else {
1770 unlock_buffer(bh);
1771 }
1772 } while ((bh = bh->b_this_page) != head);
1773
1774 /*
1775 * The page and its buffers are protected by PageWriteback(), so we can
1776 * drop the bh refcounts early.
1777 */
1778 BUG_ON(PageWriteback(page));
1779 set_page_writeback(page);
1780
1781 do {
1782 struct buffer_head *next = bh->b_this_page;
1783 if (buffer_async_write(bh)) {
1784 submit_bh(WRITE, bh);
1785 nr_underway++;
1786 }
1787 bh = next;
1788 } while (bh != head);
1789 unlock_page(page);
1790
1791 err = 0;
1792done:
1793 if (nr_underway == 0) {
1794 /*
1795 * The page was marked dirty, but the buffers were
1796 * clean. Someone wrote them back by hand with
1797 * ll_rw_block/submit_bh. A rare case.
1798 */
1799 int uptodate = 1;
1800 do {
1801 if (!buffer_uptodate(bh)) {
1802 uptodate = 0;
1803 break;
1804 }
1805 bh = bh->b_this_page;
1806 } while (bh != head);
1807 if (uptodate)
1808 SetPageUptodate(page);
1809 end_page_writeback(page);
1810 }
1811 return err;
1812
1813recover:
1814 /*
1815 * ENOSPC, or some other error. We may already have added some
1816 * blocks to the file, so we need to write these out to avoid
1817 * exposing stale data.
1818 * The page is currently locked and not marked for writeback
1819 */
1820 bh = head;
1821 /* Recovery: lock and submit the mapped buffers */
1822 do {
1823 if (buffer_mapped(bh) && buffer_dirty(bh)) {
1824 lock_buffer(bh);
1825 mark_buffer_async_write(bh);
1826 } else {
1827 /*
1828 * The buffer may have been set dirty during
1829 * attachment to a dirty page.
1830 */
1831 clear_buffer_dirty(bh);
1832 }
1833 } while ((bh = bh->b_this_page) != head);
1834 SetPageError(page);
1835 BUG_ON(PageWriteback(page));
1836 set_page_writeback(page);
1837 do {
1838 struct buffer_head *next = bh->b_this_page;
1839 if (buffer_async_write(bh)) {
1840 clear_buffer_dirty(bh);
1841 submit_bh(WRITE, bh);
1842 nr_underway++;
1843 }
1844 bh = next;
1845 } while (bh != head);
1846 unlock_page(page);
1847 goto done;
1848}
1849
1850static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1851{
1852 struct inode * const inode = page->mapping->host;
1853 loff_t i_size = i_size_read(inode);
1854 const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
1855 unsigned offset;
1856 void *kaddr;
1857
1858 /* Is the page fully inside i_size? */
1859 if (page->index < end_index)
1860 return __btrfs_write_full_page(inode, page, wbc);
1861
1862 /* Is the page fully outside i_size? (truncate in progress) */
1863 offset = i_size & (PAGE_CACHE_SIZE-1);
1864 if (page->index >= end_index+1 || !offset) {
1865 /*
1866 * The page may have dirty, unmapped buffers. For example,
1867 * they may have been added in ext3_writepage(). Make them
1868 * freeable here, so the page does not leak.
1869 */
1870 block_invalidatepage(page, 0);
1871 unlock_page(page);
1872 return 0; /* don't care */
1873 }
1874
1875 /*
1876 * The page straddles i_size. It must be zeroed out on each and every
1877 * writepage invokation because it may be mmapped. "A file is mapped
1878 * in multiples of the page size. For a file that is not a multiple of
1879 * the page size, the remaining memory is zeroed when mapped, and
1880 * writes to that region are not written out to the file."
1881 */
1882 kaddr = kmap_atomic(page, KM_USER0);
1883 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1884 flush_dcache_page(page);
1885 kunmap_atomic(kaddr, KM_USER0);
1886 return __btrfs_write_full_page(inode, page, wbc);
1887}
1888
9ebefb18
CM		 1889/*
1890 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1891 * called from a page fault handler when a page is first dirtied. Hence we must
1892 * be careful to check for EOF conditions here. We set the page up correctly
1893 * for a written page which means we get ENOSPC checking when writing into
1894 * holes and correct delalloc and unwritten extent mapping on filesystems that
1895 * support these features.
1896 *
1897 * We are not allowed to take the i_mutex here so we have to play games to
1898 * protect against truncate races as the page could now be beyond EOF. Because
1899 * vmtruncate() writes the inode size before removing pages, once we have the
1900 * page lock we can determine safely if the page is beyond EOF. If it is not
1901 * beyond EOF, then the page is guaranteed safe against truncation until we
1902 * unlock the page.
1903 */
1904int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
1905{
1906 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
1907 unsigned long end;
1908 loff_t size;
1909 int ret = -EINVAL;
1910
1911 lock_page(page);
1912 wait_on_page_writeback(page);
9ebefb18
CM		 1913 size = i_size_read(inode);
1914 if ((page->mapping != inode->i_mapping) ||
1915 ((page->index << PAGE_CACHE_SHIFT) > size)) {
1916 /* page got truncated out from underneath us */
1917 goto out_unlock;
1918 }
1919
1920 /* page is wholly or partially inside EOF */
1921 if (((page->index + 1) << PAGE_CACHE_SHIFT) > size)
1922 end = size & ~PAGE_CACHE_MASK;
1923 else
1924 end = PAGE_CACHE_SIZE;
1925
1926 ret = btrfs_prepare_write(NULL, page, 0, end);
1927 if (!ret)
1928 ret = btrfs_commit_write(NULL, page, 0, end);
1929
1930out_unlock:
1931 unlock_page(page);
1932 return ret;
1933}
1934
39279cc3
CM		 1935static void btrfs_truncate(struct inode *inode)
1936{
1937 struct btrfs_root *root = BTRFS_I(inode)->root;
1938 int ret;
1939 struct btrfs_trans_handle *trans;
1940
1941 if (!S_ISREG(inode->i_mode))
1942 return;
1943 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1944 return;
1945
1946 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1947
1948 mutex_lock(&root->fs_info->fs_mutex);
1949 trans = btrfs_start_transaction(root, 1);
1950 btrfs_set_trans_block_group(trans, inode);
1951
1952 /* FIXME, add redo link to tree so we don't leak on crash */
1953 ret = btrfs_truncate_in_trans(trans, root, inode);
39279cc3
CM		 1954 btrfs_update_inode(trans, root, inode);
1955 ret = btrfs_end_transaction(trans, root);
1956 BUG_ON(ret);
1957 mutex_unlock(&root->fs_info->fs_mutex);
1958 btrfs_btree_balance_dirty(root);
1959}
1960
1961int btrfs_commit_write(struct file *file, struct page *page,
1962 unsigned from, unsigned to)
1963{
1964 struct inode *inode = page->mapping->host;
1965 struct buffer_head *bh;
1966 loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
1967
1968 SetPageUptodate(page);
1969 bh = page_buffers(page);
1970 set_buffer_uptodate(bh);
1971 if (buffer_mapped(bh) && bh->b_blocknr != 0) {
1972 set_page_dirty(page);
1973 }
1974 if (pos > inode->i_size) {
1975 i_size_write(inode, pos);
1976 mark_inode_dirty(inode);
1977 }
1978 return 0;
1979}
1980
1981static int create_subvol(struct btrfs_root *root, char *name, int namelen)
1982{
1983 struct btrfs_trans_handle *trans;
1984 struct btrfs_key key;
1985 struct btrfs_root_item root_item;
1986 struct btrfs_inode_item *inode_item;
1987 struct buffer_head *subvol;
1988 struct btrfs_leaf *leaf;
1989 struct btrfs_root *new_root;
1990 struct inode *inode;
1991 struct inode *dir;
1992 int ret;
54aa1f4d 1993 int err;
39279cc3
CM		 1994 u64 objectid;
1995 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
1996
1997 mutex_lock(&root->fs_info->fs_mutex);
1998 trans = btrfs_start_transaction(root, 1);
1999 BUG_ON(!trans);
2000
6702ed49 2001 subvol = btrfs_alloc_free_block(trans, root, 0, 0);
54aa1f4d
CM		 2002 if (IS_ERR(subvol))
2003 return PTR_ERR(subvol);
39279cc3
CM		 2004 leaf = btrfs_buffer_leaf(subvol);
2005 btrfs_set_header_nritems(&leaf->header, 0);
2006 btrfs_set_header_level(&leaf->header, 0);
2007 btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
2008 btrfs_set_header_generation(&leaf->header, trans->transid);
2009 btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
2010 memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
2011 sizeof(leaf->header.fsid));
ccd467d6 2012 btrfs_mark_buffer_dirty(subvol);
39279cc3
CM		 2013
2014 inode_item = &root_item.inode;
2015 memset(inode_item, 0, sizeof(*inode_item));
2016 btrfs_set_inode_generation(inode_item, 1);
2017 btrfs_set_inode_size(inode_item, 3);
2018 btrfs_set_inode_nlink(inode_item, 1);
2019 btrfs_set_inode_nblocks(inode_item, 1);
2020 btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
2021
2022 btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
2023 btrfs_set_root_refs(&root_item, 1);
5eda7b5e
CM		 2024 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2025 root_item.drop_level = 0;
39279cc3
CM		 2026 brelse(subvol);
2027 subvol = NULL;
2028
2029 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2030 0, &objectid);
54aa1f4d
CM		 2031 if (ret)
2032 goto fail;
39279cc3
CM		 2033
2034 btrfs_set_root_dirid(&root_item, new_dirid);
2035
2036 key.objectid = objectid;
2037 key.offset = 1;
2038 key.flags = 0;
2039 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2040 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2041 &root_item);
54aa1f4d
CM		 2042 if (ret)
2043 goto fail;
39279cc3
CM		 2044
2045 /*
2046 * insert the directory item
2047 */
2048 key.offset = (u64)-1;
2049 dir = root->fs_info->sb->s_root->d_inode;
2050 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2051 name, namelen, dir->i_ino, &key,
2052 BTRFS_FT_DIR);
54aa1f4d
CM		 2053 if (ret)
2054 goto fail;
39279cc3
CM		 2055
2056 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2057 if (ret)
2058 goto fail_commit;
39279cc3
CM		 2059
2060 new_root = btrfs_read_fs_root(root->fs_info, &key);
2061 BUG_ON(!new_root);
2062
2063 trans = btrfs_start_transaction(new_root, 1);
2064 BUG_ON(!trans);
2065
2066 inode = btrfs_new_inode(trans, new_root, new_dirid,
2067 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2068 if (IS_ERR(inode))
2069 goto fail;
39279cc3
CM		 2070 inode->i_op = &btrfs_dir_inode_operations;
2071 inode->i_fop = &btrfs_dir_file_operations;
34088780 2072 new_root->inode = inode;
39279cc3
CM		 2073
2074 ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
54aa1f4d
CM		 2075 if (ret)
2076 goto fail;
39279cc3
CM		 2077
2078 inode->i_nlink = 1;
2079 inode->i_size = 6;
2080 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2081 if (ret)
2082 goto fail;
2083fail:
2084 err = btrfs_commit_transaction(trans, root);
2085 if (err && !ret)
2086 ret = err;
2087fail_commit:
39279cc3
CM		 2088 mutex_unlock(&root->fs_info->fs_mutex);
2089 btrfs_btree_balance_dirty(root);
54aa1f4d 2090 return ret;
39279cc3
CM		 2091}
2092
2093static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2094{
2095 struct btrfs_trans_handle *trans;
2096 struct btrfs_key key;
2097 struct btrfs_root_item new_root_item;
2098 int ret;
54aa1f4d 2099 int err;
39279cc3
CM		 2100 u64 objectid;
2101
2102 if (!root->ref_cows)
2103 return -EINVAL;
2104
2105 mutex_lock(&root->fs_info->fs_mutex);
2106 trans = btrfs_start_transaction(root, 1);
2107 BUG_ON(!trans);
2108
2109 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d
CM		 2110 if (ret)
2111 goto fail;
39279cc3
CM		 2112
2113 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2114 0, &objectid);
54aa1f4d
CM		 2115 if (ret)
2116 goto fail;
39279cc3
CM		 2117
2118 memcpy(&new_root_item, &root->root_item,
2119 sizeof(new_root_item));
2120
2121 key.objectid = objectid;
2122 key.offset = 1;
2123 key.flags = 0;
2124 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2125 btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node));
2126
2127 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2128 &new_root_item);
54aa1f4d
CM		 2129 if (ret)
2130 goto fail;
39279cc3
CM		 2131
2132 /*
2133 * insert the directory item
2134 */
2135 key.offset = (u64)-1;
2136 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2137 name, namelen,
2138 root->fs_info->sb->s_root->d_inode->i_ino,
2139 &key, BTRFS_FT_DIR);
2140
54aa1f4d
CM		 2141 if (ret)
2142 goto fail;
39279cc3
CM		 2143
2144 ret = btrfs_inc_root_ref(trans, root);
54aa1f4d
CM		 2145 if (ret)
2146 goto fail;
39279cc3 2147
54aa1f4d
CM		 2148fail:
2149 err = btrfs_commit_transaction(trans, root);
2150 if (err && !ret)
2151 ret = err;
39279cc3
CM		 2152 mutex_unlock(&root->fs_info->fs_mutex);
2153 btrfs_btree_balance_dirty(root);
54aa1f4d 2154 return ret;
39279cc3
CM		 2155}
2156
2157int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
2158 cmd, unsigned long arg)
2159{
2160 struct btrfs_root *root = BTRFS_I(inode)->root;
2161 struct btrfs_ioctl_vol_args vol_args;
2162 int ret = 0;
2163 struct btrfs_dir_item *di;
2164 int namelen;
2165 struct btrfs_path *path;
2166 u64 root_dirid;
2167
2168 switch (cmd) {
2169 case BTRFS_IOC_SNAP_CREATE:
2170 if (copy_from_user(&vol_args,
2171 (struct btrfs_ioctl_vol_args __user *)arg,
2172 sizeof(vol_args)))
2173 return -EFAULT;
2174 namelen = strlen(vol_args.name);
2175 if (namelen > BTRFS_VOL_NAME_MAX)
2176 return -EINVAL;
8a712645
CM		 2177 if (strchr(vol_args.name, '/'))
2178 return -EINVAL;
39279cc3
CM		 2179 path = btrfs_alloc_path();
2180 if (!path)
2181 return -ENOMEM;
2182 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2183 mutex_lock(&root->fs_info->fs_mutex);
2184 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2185 path, root_dirid,
2186 vol_args.name, namelen, 0);
2187 mutex_unlock(&root->fs_info->fs_mutex);
2188 btrfs_free_path(path);
2189 if (di && !IS_ERR(di))
2190 return -EEXIST;
54aa1f4d
CM		 2191 if (IS_ERR(di))
2192 return PTR_ERR(di);
39279cc3
CM		 2193
2194 if (root == root->fs_info->tree_root)
2195 ret = create_subvol(root, vol_args.name, namelen);
2196 else
2197 ret = create_snapshot(root, vol_args.name, namelen);
39279cc3 2198 break;
6702ed49
CM		 2199
2200 case BTRFS_IOC_DEFRAG:
2201 mutex_lock(&root->fs_info->fs_mutex);
e9d0b13b
CM		 2202 btrfs_defrag_root(root, 0);
2203 btrfs_defrag_root(root->fs_info->extent_root, 0);
6702ed49
CM		 2204 mutex_unlock(&root->fs_info->fs_mutex);
2205 ret = 0;
2206 break;
39279cc3
CM		 2207 default:
2208 return -ENOTTY;
2209 }
2210 return ret;
2211}
2212
2213#ifdef CONFIG_COMPAT
2214long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
2215 unsigned long arg)
2216{
2217 struct inode *inode = file->f_path.dentry->d_inode;
2218 int ret;
2219 lock_kernel();
2220 ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
2221 unlock_kernel();
2222 return ret;
2223
2224}
2225#endif
2226
2227/*
2228 * Called inside transaction, so use GFP_NOFS
2229 */
2230struct inode *btrfs_alloc_inode(struct super_block *sb)
2231{
2232 struct btrfs_inode *ei;
2233
2234 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2235 if (!ei)
2236 return NULL;
2237 return &ei->vfs_inode;
2238}
2239
2240void btrfs_destroy_inode(struct inode *inode)
2241{
2242 WARN_ON(!list_empty(&inode->i_dentry));
2243 WARN_ON(inode->i_data.nrpages);
2244
2245 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2246}
2247
2248static void init_once(void * foo, struct kmem_cache * cachep,
2249 unsigned long flags)
2250{
2251 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2252
2253 inode_init_once(&ei->vfs_inode);
2254}
2255
2256void btrfs_destroy_cachep(void)
2257{
2258 if (btrfs_inode_cachep)
2259 kmem_cache_destroy(btrfs_inode_cachep);
2260 if (btrfs_trans_handle_cachep)
2261 kmem_cache_destroy(btrfs_trans_handle_cachep);
2262 if (btrfs_transaction_cachep)
2263 kmem_cache_destroy(btrfs_transaction_cachep);
2264 if (btrfs_bit_radix_cachep)
2265 kmem_cache_destroy(btrfs_bit_radix_cachep);
2266 if (btrfs_path_cachep)
2267 kmem_cache_destroy(btrfs_path_cachep);
2268}
2269
92fee66d
CM		 2270static struct kmem_cache *cache_create(const char *name, size_t size,
2271 unsigned long extra_flags,
2272 void (*ctor)(void *, struct kmem_cache *,
2273 unsigned long))
2274{
2275 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2276 SLAB_MEM_SPREAD | extra_flags), ctor
2277#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2278 ,NULL
2279#endif
2280 );
2281}
2282
39279cc3
CM		 2283int btrfs_init_cachep(void)
2284{
92fee66d
CM		 2285 btrfs_inode_cachep = cache_create("btrfs_inode_cache",
2286 sizeof(struct btrfs_inode),
2287 0, init_once);
39279cc3
CM		 2288 if (!btrfs_inode_cachep)
2289 goto fail;
92fee66d 2290 btrfs_trans_handle_cachep = cache_create("btrfs_trans_handle_cache",
39279cc3 2291 sizeof(struct btrfs_trans_handle),
92fee66d 2292 0, NULL);
39279cc3
CM		 2293 if (!btrfs_trans_handle_cachep)
2294 goto fail;
92fee66d 2295 btrfs_transaction_cachep = cache_create("btrfs_transaction_cache",
39279cc3 2296 sizeof(struct btrfs_transaction),
92fee66d 2297 0, NULL);
39279cc3
CM		 2298 if (!btrfs_transaction_cachep)
2299 goto fail;
92fee66d
CM		 2300 btrfs_path_cachep = cache_create("btrfs_path_cache",
2301 sizeof(struct btrfs_transaction),
2302 0, NULL);
39279cc3
CM		 2303 if (!btrfs_path_cachep)
2304 goto fail;
92fee66d
CM		 2305 btrfs_bit_radix_cachep = cache_create("btrfs_radix", 256,
2306 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2307 if (!btrfs_bit_radix_cachep)
2308 goto fail;
2309 return 0;
2310fail:
2311 btrfs_destroy_cachep();
2312 return -ENOMEM;
2313}
2314
2315static int btrfs_getattr(struct vfsmount *mnt,
2316 struct dentry *dentry, struct kstat *stat)
2317{
2318 struct inode *inode = dentry->d_inode;
2319 generic_fillattr(inode, stat);
2320 stat->blksize = 256 * 1024;
2321 return 0;
2322}
2323
2324static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2325 struct inode * new_dir,struct dentry *new_dentry)
2326{
2327 struct btrfs_trans_handle *trans;
2328 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2329 struct inode *new_inode = new_dentry->d_inode;
2330 struct inode *old_inode = old_dentry->d_inode;
2331 struct timespec ctime = CURRENT_TIME;
2332 struct btrfs_path *path;
2333 struct btrfs_dir_item *di;
2334 int ret;
2335
2336 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2337 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2338 return -ENOTEMPTY;
2339 }
2340 mutex_lock(&root->fs_info->fs_mutex);
2341 trans = btrfs_start_transaction(root, 1);
2342 btrfs_set_trans_block_group(trans, new_dir);
2343 path = btrfs_alloc_path();
2344 if (!path) {
2345 ret = -ENOMEM;
2346 goto out_fail;
2347 }
2348
2349 old_dentry->d_inode->i_nlink++;
2350 old_dir->i_ctime = old_dir->i_mtime = ctime;
2351 new_dir->i_ctime = new_dir->i_mtime = ctime;
2352 old_inode->i_ctime = ctime;
2353 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
2354 struct btrfs_key *location = &BTRFS_I(new_dir)->location;
2355 u64 old_parent_oid;
2356 di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
2357 "..", 2, -1);
2358 if (IS_ERR(di)) {
2359 ret = PTR_ERR(di);
2360 goto out_fail;
2361 }
2362 if (!di) {
2363 ret = -ENOENT;
2364 goto out_fail;
2365 }
2366 old_parent_oid = btrfs_disk_key_objectid(&di->location);
2367 ret = btrfs_del_item(trans, root, path);
2368 if (ret) {
39279cc3
CM		 2369 goto out_fail;
2370 }
2371 btrfs_release_path(root, path);
2372
2373 di = btrfs_lookup_dir_index_item(trans, root, path,
2374 old_inode->i_ino,
2375 old_parent_oid,
2376 "..", 2, -1);
2377 if (IS_ERR(di)) {
2378 ret = PTR_ERR(di);
2379 goto out_fail;
2380 }
2381 if (!di) {
2382 ret = -ENOENT;
2383 goto out_fail;
2384 }
2385 ret = btrfs_del_item(trans, root, path);
2386 if (ret) {
39279cc3
CM		 2387 goto out_fail;
2388 }
2389 btrfs_release_path(root, path);
2390
2391 ret = btrfs_insert_dir_item(trans, root, "..", 2,
2392 old_inode->i_ino, location,
2393 BTRFS_FT_DIR);
2394 if (ret)
2395 goto out_fail;
2396 }
2397
2398
2399 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2400 if (ret)
2401 goto out_fail;
2402
2403 if (new_inode) {
2404 new_inode->i_ctime = CURRENT_TIME;
2405 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2406 if (ret)
2407 goto out_fail;
2408 if (S_ISDIR(new_inode->i_mode))
2409 clear_nlink(new_inode);
2410 else
2411 drop_nlink(new_inode);
54aa1f4d
CM		 2412 ret = btrfs_update_inode(trans, root, new_inode);
2413 if (ret)
2414 goto out_fail;
39279cc3
CM		 2415 }
2416 ret = btrfs_add_link(trans, new_dentry, old_inode);
2417 if (ret)
2418 goto out_fail;
2419
2420out_fail:
2421 btrfs_free_path(path);
2422 btrfs_end_transaction(trans, root);
2423 mutex_unlock(&root->fs_info->fs_mutex);
2424 return ret;
2425}
2426
2427static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2428 const char *symname)
2429{
2430 struct btrfs_trans_handle *trans;
2431 struct btrfs_root *root = BTRFS_I(dir)->root;
2432 struct btrfs_path *path;
2433 struct btrfs_key key;
2434 struct inode *inode;
2435 int err;
2436 int drop_inode = 0;
2437 u64 objectid;
2438 int name_len;
2439 int datasize;
2440 char *ptr;
2441 struct btrfs_file_extent_item *ei;
2442
2443 name_len = strlen(symname) + 1;
2444 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2445 return -ENAMETOOLONG;
2446 mutex_lock(&root->fs_info->fs_mutex);
2447 trans = btrfs_start_transaction(root, 1);
2448 btrfs_set_trans_block_group(trans, dir);
2449
2450 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2451 if (err) {
2452 err = -ENOSPC;
2453 goto out_unlock;
2454 }
2455
2456 inode = btrfs_new_inode(trans, root, objectid,
2457 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2458 err = PTR_ERR(inode);
2459 if (IS_ERR(inode))
2460 goto out_unlock;
2461
2462 btrfs_set_trans_block_group(trans, inode);
2463 err = btrfs_add_nondir(trans, dentry, inode);
2464 if (err)
2465 drop_inode = 1;
2466 else {
2467 inode->i_mapping->a_ops = &btrfs_aops;
2468 inode->i_fop = &btrfs_file_operations;
2469 inode->i_op = &btrfs_file_inode_operations;
2470 }
2471 dir->i_sb->s_dirt = 1;
2472 btrfs_update_inode_block_group(trans, inode);
2473 btrfs_update_inode_block_group(trans, dir);
2474 if (drop_inode)
2475 goto out_unlock;
2476
2477 path = btrfs_alloc_path();
2478 BUG_ON(!path);
2479 key.objectid = inode->i_ino;
2480 key.offset = 0;
2481 key.flags = 0;
2482 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2483 datasize = btrfs_file_extent_calc_inline_size(name_len);
2484 err = btrfs_insert_empty_item(trans, root, path, &key,
2485 datasize);
54aa1f4d
CM		 2486 if (err) {
2487 drop_inode = 1;
2488 goto out_unlock;
2489 }
39279cc3
CM		 2490 ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
2491 path->slots[0], struct btrfs_file_extent_item);
2492 btrfs_set_file_extent_generation(ei, trans->transid);
2493 btrfs_set_file_extent_type(ei,
2494 BTRFS_FILE_EXTENT_INLINE);
2495 ptr = btrfs_file_extent_inline_start(ei);
2496 btrfs_memcpy(root, path->nodes[0]->b_data,
2497 ptr, symname, name_len);
ccd467d6 2498 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3
CM		 2499 btrfs_free_path(path);
2500 inode->i_op = &btrfs_symlink_inode_operations;
2501 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2502 inode->i_size = name_len - 1;
54aa1f4d
CM		 2503 err = btrfs_update_inode(trans, root, inode);
2504 if (err)
2505 drop_inode = 1;
39279cc3
CM		 2506
2507out_unlock:
2508 btrfs_end_transaction(trans, root);
2509 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2510 if (drop_inode) {
2511 inode_dec_link_count(inode);
2512 iput(inode);
2513 }
2514 btrfs_btree_balance_dirty(root);
2515 return err;
2516}
2517
2518static struct inode_operations btrfs_dir_inode_operations = {
2519 .lookup = btrfs_lookup,
2520 .create = btrfs_create,
2521 .unlink = btrfs_unlink,
2522 .link = btrfs_link,
2523 .mkdir = btrfs_mkdir,
2524 .rmdir = btrfs_rmdir,
2525 .rename = btrfs_rename,
2526 .symlink = btrfs_symlink,
2527 .setattr = btrfs_setattr,
618e21d5 2528 .mknod = btrfs_mknod,
39279cc3
CM		 2529};
2530
2531static struct inode_operations btrfs_dir_ro_inode_operations = {
2532 .lookup = btrfs_lookup,
2533};
2534
2535static struct file_operations btrfs_dir_file_operations = {
2536 .llseek = generic_file_llseek,
2537 .read = generic_read_dir,
2538 .readdir = btrfs_readdir,
2539 .ioctl = btrfs_ioctl,
2540#ifdef CONFIG_COMPAT
2541 .compat_ioctl = btrfs_compat_ioctl,
2542#endif
2543};
2544
2545static struct address_space_operations btrfs_aops = {
2546 .readpage = btrfs_readpage,
2547 .writepage = btrfs_writepage,
2548 .sync_page = block_sync_page,
2549 .prepare_write = btrfs_prepare_write,
2550 .commit_write = btrfs_commit_write,
2551 .bmap = btrfs_bmap,
2552};
2553
2554static struct address_space_operations btrfs_symlink_aops = {
2555 .readpage = btrfs_readpage,
2556 .writepage = btrfs_writepage,
2557};
2558
2559static struct inode_operations btrfs_file_inode_operations = {
2560 .truncate = btrfs_truncate,
2561 .getattr = btrfs_getattr,
2562 .setattr = btrfs_setattr,
2563};
2564
618e21d5
JB		 2565static struct inode_operations btrfs_special_inode_operations = {
2566 .getattr = btrfs_getattr,
2567 .setattr = btrfs_setattr,
2568};
2569
39279cc3
CM		 2570static struct inode_operations btrfs_symlink_inode_operations = {
2571 .readlink = generic_readlink,
2572 .follow_link = page_follow_link_light,
2573 .put_link = page_put_link,
2574};
Linux 6.x block layer and io_uring tree(s)