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Btrfs: Do more extensive readahead during tree searches
[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]);
15ee9bc7 196 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 197 ret = 0;
198failed:
199 btrfs_release_path(root, path);
200 btrfs_free_path(path);
201 return ret;
202}
203
204
205static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
206 struct btrfs_root *root,
207 struct inode *dir,
208 struct dentry *dentry)
209{
210 struct btrfs_path *path;
211 const char *name = dentry->d_name.name;
212 int name_len = dentry->d_name.len;
213 int ret = 0;
214 u64 objectid;
215 struct btrfs_dir_item *di;
216
217 path = btrfs_alloc_path();
54aa1f4d
CM		 218 if (!path) {
219 ret = -ENOMEM;
220 goto err;
221 }
222
39279cc3
CM		 223 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
224 name, name_len, -1);
225 if (IS_ERR(di)) {
226 ret = PTR_ERR(di);
227 goto err;
228 }
229 if (!di) {
230 ret = -ENOENT;
231 goto err;
232 }
233 objectid = btrfs_disk_key_objectid(&di->location);
234 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 235 if (ret)
236 goto err;
39279cc3
CM		 237 btrfs_release_path(root, path);
238
239 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
240 objectid, name, name_len, -1);
241 if (IS_ERR(di)) {
242 ret = PTR_ERR(di);
243 goto err;
244 }
245 if (!di) {
246 ret = -ENOENT;
247 goto err;
248 }
249 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 250
251 dentry->d_inode->i_ctime = dir->i_ctime;
252err:
253 btrfs_free_path(path);
254 if (!ret) {
255 dir->i_size -= name_len * 2;
79c44584 256 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3
CM		 257 btrfs_update_inode(trans, root, dir);
258 drop_nlink(dentry->d_inode);
54aa1f4d 259 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 260 dir->i_sb->s_dirt = 1;
261 }
262 return ret;
263}
264
265static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
266{
267 struct btrfs_root *root;
268 struct btrfs_trans_handle *trans;
269 int ret;
270
271 root = BTRFS_I(dir)->root;
272 mutex_lock(&root->fs_info->fs_mutex);
273 trans = btrfs_start_transaction(root, 1);
274 btrfs_set_trans_block_group(trans, dir);
275 ret = btrfs_unlink_trans(trans, root, dir, dentry);
276 btrfs_end_transaction(trans, root);
277 mutex_unlock(&root->fs_info->fs_mutex);
278 btrfs_btree_balance_dirty(root);
279 return ret;
280}
281
282static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
283{
284 struct inode *inode = dentry->d_inode;
285 int err;
286 int ret;
287 struct btrfs_root *root = BTRFS_I(dir)->root;
288 struct btrfs_path *path;
289 struct btrfs_key key;
290 struct btrfs_trans_handle *trans;
291 struct btrfs_key found_key;
292 int found_type;
293 struct btrfs_leaf *leaf;
294 char *goodnames = "..";
295
296 path = btrfs_alloc_path();
297 BUG_ON(!path);
39279cc3
CM		 298 mutex_lock(&root->fs_info->fs_mutex);
299 trans = btrfs_start_transaction(root, 1);
300 btrfs_set_trans_block_group(trans, dir);
301 key.objectid = inode->i_ino;
302 key.offset = (u64)-1;
303 key.flags = (u32)-1;
304 while(1) {
305 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
306 if (ret < 0) {
307 err = ret;
308 goto out;
309 }
310 BUG_ON(ret == 0);
311 if (path->slots[0] == 0) {
312 err = -ENOENT;
313 goto out;
314 }
315 path->slots[0]--;
316 leaf = btrfs_buffer_leaf(path->nodes[0]);
317 btrfs_disk_key_to_cpu(&found_key,
318 &leaf->items[path->slots[0]].key);
319 found_type = btrfs_key_type(&found_key);
320 if (found_key.objectid != inode->i_ino) {
321 err = -ENOENT;
322 goto out;
323 }
324 if ((found_type != BTRFS_DIR_ITEM_KEY &&
325 found_type != BTRFS_DIR_INDEX_KEY) ||
326 (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
327 !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
328 err = -ENOTEMPTY;
329 goto out;
330 }
331 ret = btrfs_del_item(trans, root, path);
332 BUG_ON(ret);
333
334 if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
335 break;
336 btrfs_release_path(root, path);
337 }
338 ret = 0;
339 btrfs_release_path(root, path);
340
341 /* now the directory is empty */
342 err = btrfs_unlink_trans(trans, root, dir, dentry);
343 if (!err) {
344 inode->i_size = 0;
345 }
346out:
347 btrfs_release_path(root, path);
348 btrfs_free_path(path);
349 mutex_unlock(&root->fs_info->fs_mutex);
350 ret = btrfs_end_transaction(trans, root);
351 btrfs_btree_balance_dirty(root);
352 if (ret && !err)
353 err = ret;
354 return err;
355}
356
357static int btrfs_free_inode(struct btrfs_trans_handle *trans,
358 struct btrfs_root *root,
359 struct inode *inode)
360{
361 struct btrfs_path *path;
362 int ret;
363
364 clear_inode(inode);
365
366 path = btrfs_alloc_path();
367 BUG_ON(!path);
39279cc3
CM		 368 ret = btrfs_lookup_inode(trans, root, path,
369 &BTRFS_I(inode)->location, -1);
54aa1f4d
CM		 370 if (ret > 0)
371 ret = -ENOENT;
372 if (!ret)
373 ret = btrfs_del_item(trans, root, path);
39279cc3
CM		 374 btrfs_free_path(path);
375 return ret;
376}
377
39279cc3
CM		 378/*
379 * this can truncate away extent items, csum items and directory items.
380 * It starts at a high offset and removes keys until it can't find
381 * any higher than i_size.
382 *
383 * csum items that cross the new i_size are truncated to the new size
384 * as well.
385 */
386static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
387 struct btrfs_root *root,
388 struct inode *inode)
389{
390 int ret;
391 struct btrfs_path *path;
392 struct btrfs_key key;
393 struct btrfs_disk_key *found_key;
394 u32 found_type;
395 struct btrfs_leaf *leaf;
396 struct btrfs_file_extent_item *fi;
397 u64 extent_start = 0;
398 u64 extent_num_blocks = 0;
399 u64 item_end = 0;
400 int found_extent;
401 int del_item;
402
403 path = btrfs_alloc_path();
3c69faec 404 path->reada = -1;
39279cc3
CM		 405 BUG_ON(!path);
406 /* FIXME, add redo link to tree so we don't leak on crash */
407 key.objectid = inode->i_ino;
408 key.offset = (u64)-1;
409 key.flags = (u32)-1;
410 while(1) {
411 btrfs_init_path(path);
412 fi = NULL;
413 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
414 if (ret < 0) {
415 goto error;
416 }
417 if (ret > 0) {
418 BUG_ON(path->slots[0] == 0);
419 path->slots[0]--;
420 }
39279cc3
CM		 421 leaf = btrfs_buffer_leaf(path->nodes[0]);
422 found_key = &leaf->items[path->slots[0]].key;
423 found_type = btrfs_disk_key_type(found_key);
424
425 if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
426 break;
427 if (found_type != BTRFS_CSUM_ITEM_KEY &&
428 found_type != BTRFS_DIR_ITEM_KEY &&
429 found_type != BTRFS_DIR_INDEX_KEY &&
430 found_type != BTRFS_EXTENT_DATA_KEY)
431 break;
432
433 item_end = btrfs_disk_key_offset(found_key);
434 if (found_type == BTRFS_EXTENT_DATA_KEY) {
435 fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
436 path->slots[0],
437 struct btrfs_file_extent_item);
438 if (btrfs_file_extent_type(fi) !=
439 BTRFS_FILE_EXTENT_INLINE) {
440 item_end += btrfs_file_extent_num_blocks(fi) <<
441 inode->i_blkbits;
442 }
443 }
444 if (found_type == BTRFS_CSUM_ITEM_KEY) {
445 ret = btrfs_csum_truncate(trans, root, path,
446 inode->i_size);
447 BUG_ON(ret);
448 }
449 if (item_end < inode->i_size) {
450 if (found_type) {
451 btrfs_set_key_type(&key, found_type - 1);
452 continue;
453 }
454 break;
455 }
456 if (btrfs_disk_key_offset(found_key) >= inode->i_size)
457 del_item = 1;
458 else
459 del_item = 0;
460 found_extent = 0;
461
462 /* FIXME, shrink the extent if the ref count is only 1 */
463 if (found_type == BTRFS_EXTENT_DATA_KEY &&
464 btrfs_file_extent_type(fi) !=
465 BTRFS_FILE_EXTENT_INLINE) {
466 u64 num_dec;
467 if (!del_item) {
468 u64 orig_num_blocks =
469 btrfs_file_extent_num_blocks(fi);
470 extent_num_blocks = inode->i_size -
471 btrfs_disk_key_offset(found_key) +
472 root->blocksize - 1;
473 extent_num_blocks >>= inode->i_blkbits;
474 btrfs_set_file_extent_num_blocks(fi,
475 extent_num_blocks);
476 inode->i_blocks -= (orig_num_blocks -
477 extent_num_blocks) << 3;
ccd467d6 478 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3
CM		 479 } else {
480 extent_start =
481 btrfs_file_extent_disk_blocknr(fi);
482 extent_num_blocks =
483 btrfs_file_extent_disk_num_blocks(fi);
484 /* FIXME blocksize != 4096 */
485 num_dec = btrfs_file_extent_num_blocks(fi) << 3;
486 if (extent_start != 0) {
487 found_extent = 1;
488 inode->i_blocks -= num_dec;
489 }
490 }
491 }
492 if (del_item) {
493 ret = btrfs_del_item(trans, root, path);
54aa1f4d
CM		 494 if (ret)
495 goto error;
39279cc3
CM		 496 } else {
497 break;
498 }
499 btrfs_release_path(root, path);
500 if (found_extent) {
501 ret = btrfs_free_extent(trans, root, extent_start,
502 extent_num_blocks, 0);
503 BUG_ON(ret);
504 }
505 }
506 ret = 0;
507error:
508 btrfs_release_path(root, path);
509 btrfs_free_path(path);
510 inode->i_sb->s_dirt = 1;
511 return ret;
512}
513
514/*
515 * taken from block_truncate_page, but does cow as it zeros out
516 * any bytes left in the last page in the file.
517 */
518static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
519{
520 struct inode *inode = mapping->host;
521 unsigned blocksize = 1 << inode->i_blkbits;
522 pgoff_t index = from >> PAGE_CACHE_SHIFT;
523 unsigned offset = from & (PAGE_CACHE_SIZE-1);
524 struct page *page;
525 char *kaddr;
526 int ret = 0;
527 struct btrfs_root *root = BTRFS_I(inode)->root;
528 u64 alloc_hint = 0;
529 struct btrfs_key ins;
530 struct btrfs_trans_handle *trans;
531
532 if ((offset & (blocksize - 1)) == 0)
533 goto out;
534
535 ret = -ENOMEM;
536 page = grab_cache_page(mapping, index);
537 if (!page)
538 goto out;
539
540 if (!PageUptodate(page)) {
9ebefb18 541 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 542 lock_page(page);
543 if (!PageUptodate(page)) {
544 ret = -EIO;
545 goto out;
546 }
547 }
548 mutex_lock(&root->fs_info->fs_mutex);
549 trans = btrfs_start_transaction(root, 1);
550 btrfs_set_trans_block_group(trans, inode);
551
552 ret = btrfs_drop_extents(trans, root, inode,
553 page->index << PAGE_CACHE_SHIFT,
554 (page->index + 1) << PAGE_CACHE_SHIFT,
555 &alloc_hint);
54aa1f4d
CM		 556 if (ret)
557 goto out;
6702ed49 558 ret = btrfs_alloc_extent(trans, root, inode->i_ino, 1, 0,
39279cc3 559 alloc_hint, (u64)-1, &ins, 1);
54aa1f4d
CM		 560 if (ret)
561 goto out;
39279cc3
CM		 562 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
563 page->index << PAGE_CACHE_SHIFT,
564 ins.objectid, 1, 1);
54aa1f4d
CM		 565 if (ret)
566 goto out;
39279cc3
CM		 567 SetPageChecked(page);
568 kaddr = kmap(page);
569 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
570 flush_dcache_page(page);
54aa1f4d 571 ret = btrfs_csum_file_block(trans, root, inode->i_ino,
39279cc3
CM		 572 page->index << PAGE_CACHE_SHIFT,
573 kaddr, PAGE_CACHE_SIZE);
574 kunmap(page);
575 btrfs_end_transaction(trans, root);
576 mutex_unlock(&root->fs_info->fs_mutex);
577
578 set_page_dirty(page);
579 unlock_page(page);
580 page_cache_release(page);
581out:
582 return ret;
583}
584
585static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
586{
587 struct inode *inode = dentry->d_inode;
588 int err;
589
590 err = inode_change_ok(inode, attr);
591 if (err)
592 return err;
593
594 if (S_ISREG(inode->i_mode) &&
595 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
596 struct btrfs_trans_handle *trans;
597 struct btrfs_root *root = BTRFS_I(inode)->root;
598 u64 mask = root->blocksize - 1;
599 u64 pos = (inode->i_size + mask) & ~mask;
600 u64 hole_size;
601
602 if (attr->ia_size <= pos)
603 goto out;
604
605 btrfs_truncate_page(inode->i_mapping, inode->i_size);
606
607 hole_size = (attr->ia_size - pos + mask) & ~mask;
608 hole_size >>= inode->i_blkbits;
609
610 mutex_lock(&root->fs_info->fs_mutex);
611 trans = btrfs_start_transaction(root, 1);
612 btrfs_set_trans_block_group(trans, inode);
613 err = btrfs_insert_file_extent(trans, root, inode->i_ino,
614 pos, 0, 0, hole_size);
39279cc3
CM		 615 btrfs_end_transaction(trans, root);
616 mutex_unlock(&root->fs_info->fs_mutex);
54aa1f4d
CM		 617 if (err)
618 return err;
39279cc3
CM		 619 }
620out:
621 err = inode_setattr(inode, attr);
622
623 return err;
624}
625void btrfs_delete_inode(struct inode *inode)
626{
627 struct btrfs_trans_handle *trans;
628 struct btrfs_root *root = BTRFS_I(inode)->root;
629 int ret;
630
631 truncate_inode_pages(&inode->i_data, 0);
632 if (is_bad_inode(inode)) {
633 goto no_delete;
634 }
635 inode->i_size = 0;
636 mutex_lock(&root->fs_info->fs_mutex);
637 trans = btrfs_start_transaction(root, 1);
638 btrfs_set_trans_block_group(trans, inode);
639 ret = btrfs_truncate_in_trans(trans, root, inode);
54aa1f4d
CM		 640 if (ret)
641 goto no_delete_lock;
642 ret = btrfs_free_inode(trans, root, inode);
643 if (ret)
644 goto no_delete_lock;
39279cc3
CM		 645 btrfs_end_transaction(trans, root);
646 mutex_unlock(&root->fs_info->fs_mutex);
647 btrfs_btree_balance_dirty(root);
648 return;
54aa1f4d
CM		 649
650no_delete_lock:
651 btrfs_end_transaction(trans, root);
652 mutex_unlock(&root->fs_info->fs_mutex);
653 btrfs_btree_balance_dirty(root);
39279cc3
CM		 654no_delete:
655 clear_inode(inode);
656}
657
658/*
659 * this returns the key found in the dir entry in the location pointer.
660 * If no dir entries were found, location->objectid is 0.
661 */
662static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
663 struct btrfs_key *location)
664{
665 const char *name = dentry->d_name.name;
666 int namelen = dentry->d_name.len;
667 struct btrfs_dir_item *di;
668 struct btrfs_path *path;
669 struct btrfs_root *root = BTRFS_I(dir)->root;
670 int ret;
671
672 path = btrfs_alloc_path();
673 BUG_ON(!path);
39279cc3
CM		 674 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
675 namelen, 0);
676 if (!di || IS_ERR(di)) {
677 location->objectid = 0;
678 ret = 0;
679 goto out;
680 }
681 btrfs_disk_key_to_cpu(location, &di->location);
682out:
683 btrfs_release_path(root, path);
684 btrfs_free_path(path);
685 return ret;
686}
687
688/*
689 * when we hit a tree root in a directory, the btrfs part of the inode
690 * needs to be changed to reflect the root directory of the tree root. This
691 * is kind of like crossing a mount point.
692 */
693static int fixup_tree_root_location(struct btrfs_root *root,
694 struct btrfs_key *location,
695 struct btrfs_root **sub_root)
696{
697 struct btrfs_path *path;
698 struct btrfs_root_item *ri;
699
700 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
701 return 0;
702 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
703 return 0;
704
705 path = btrfs_alloc_path();
706 BUG_ON(!path);
707 mutex_lock(&root->fs_info->fs_mutex);
708
709 *sub_root = btrfs_read_fs_root(root->fs_info, location);
710 if (IS_ERR(*sub_root))
711 return PTR_ERR(*sub_root);
712
713 ri = &(*sub_root)->root_item;
714 location->objectid = btrfs_root_dirid(ri);
715 location->flags = 0;
716 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
717 location->offset = 0;
718
719 btrfs_free_path(path);
720 mutex_unlock(&root->fs_info->fs_mutex);
721 return 0;
722}
723
724static int btrfs_init_locked_inode(struct inode *inode, void *p)
725{
726 struct btrfs_iget_args *args = p;
727 inode->i_ino = args->ino;
728 BTRFS_I(inode)->root = args->root;
729 return 0;
730}
731
732static int btrfs_find_actor(struct inode *inode, void *opaque)
733{
734 struct btrfs_iget_args *args = opaque;
735 return (args->ino == inode->i_ino &&
736 args->root == BTRFS_I(inode)->root);
737}
738
739struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
740 struct btrfs_root *root)
741{
742 struct inode *inode;
743 struct btrfs_iget_args args;
744 args.ino = objectid;
745 args.root = root;
746
747 inode = iget5_locked(s, objectid, btrfs_find_actor,
748 btrfs_init_locked_inode,
749 (void *)&args);
750 return inode;
751}
752
753static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
754 struct nameidata *nd)
755{
756 struct inode * inode;
757 struct btrfs_inode *bi = BTRFS_I(dir);
758 struct btrfs_root *root = bi->root;
759 struct btrfs_root *sub_root = root;
760 struct btrfs_key location;
761 int ret;
762
763 if (dentry->d_name.len > BTRFS_NAME_LEN)
764 return ERR_PTR(-ENAMETOOLONG);
765 mutex_lock(&root->fs_info->fs_mutex);
766 ret = btrfs_inode_by_name(dir, dentry, &location);
767 mutex_unlock(&root->fs_info->fs_mutex);
768 if (ret < 0)
769 return ERR_PTR(ret);
770 inode = NULL;
771 if (location.objectid) {
772 ret = fixup_tree_root_location(root, &location, &sub_root);
773 if (ret < 0)
774 return ERR_PTR(ret);
775 if (ret > 0)
776 return ERR_PTR(-ENOENT);
777 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
778 sub_root);
779 if (!inode)
780 return ERR_PTR(-EACCES);
781 if (inode->i_state & I_NEW) {
782 /* the inode and parent dir are two different roots */
783 if (sub_root != root) {
784 igrab(inode);
785 sub_root->inode = inode;
786 }
787 BTRFS_I(inode)->root = sub_root;
788 memcpy(&BTRFS_I(inode)->location, &location,
789 sizeof(location));
790 btrfs_read_locked_inode(inode);
791 unlock_new_inode(inode);
792 }
793 }
794 return d_splice_alias(inode, dentry);
795}
796
39279cc3
CM		 797static unsigned char btrfs_filetype_table[] = {
798 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
799};
800
801static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
802{
803 struct inode *inode = filp->f_path.dentry->d_inode;
804 struct btrfs_root *root = BTRFS_I(inode)->root;
805 struct btrfs_item *item;
806 struct btrfs_dir_item *di;
807 struct btrfs_key key;
808 struct btrfs_path *path;
809 int ret;
810 u32 nritems;
811 struct btrfs_leaf *leaf;
812 int slot;
813 int advance;
814 unsigned char d_type;
815 int over = 0;
816 u32 di_cur;
817 u32 di_total;
818 u32 di_len;
819 int key_type = BTRFS_DIR_INDEX_KEY;
820
821 /* FIXME, use a real flag for deciding about the key type */
822 if (root->fs_info->tree_root == root)
823 key_type = BTRFS_DIR_ITEM_KEY;
824 mutex_lock(&root->fs_info->fs_mutex);
825 key.objectid = inode->i_ino;
826 key.flags = 0;
827 btrfs_set_key_type(&key, key_type);
828 key.offset = filp->f_pos;
829 path = btrfs_alloc_path();
2cc58cf2 830 path->reada = 2;
39279cc3
CM		 831 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
832 if (ret < 0)
833 goto err;
834 advance = 0;
39279cc3
CM		 835 while(1) {
836 leaf = btrfs_buffer_leaf(path->nodes[0]);
837 nritems = btrfs_header_nritems(&leaf->header);
838 slot = path->slots[0];
839 if (advance || slot >= nritems) {
840 if (slot >= nritems -1) {
39279cc3
CM		 841 ret = btrfs_next_leaf(root, path);
842 if (ret)
843 break;
844 leaf = btrfs_buffer_leaf(path->nodes[0]);
845 nritems = btrfs_header_nritems(&leaf->header);
846 slot = path->slots[0];
847 } else {
848 slot++;
849 path->slots[0]++;
850 }
851 }
852 advance = 1;
853 item = leaf->items + slot;
854 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
855 break;
856 if (btrfs_disk_key_type(&item->key) != key_type)
857 break;
858 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
859 continue;
860 filp->f_pos = btrfs_disk_key_offset(&item->key);
861 advance = 1;
862 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
863 di_cur = 0;
864 di_total = btrfs_item_size(leaf->items + slot);
865 while(di_cur < di_total) {
866 d_type = btrfs_filetype_table[btrfs_dir_type(di)];
867 over = filldir(dirent, (const char *)(di + 1),
868 btrfs_dir_name_len(di),
869 btrfs_disk_key_offset(&item->key),
870 btrfs_disk_key_objectid(&di->location),
871 d_type);
872 if (over)
873 goto nopos;
874 di_len = btrfs_dir_name_len(di) + sizeof(*di);
875 di_cur += di_len;
876 di = (struct btrfs_dir_item *)((char *)di + di_len);
877 }
878 }
879 filp->f_pos++;
880nopos:
881 ret = 0;
882err:
883 btrfs_release_path(root, path);
884 btrfs_free_path(path);
885 mutex_unlock(&root->fs_info->fs_mutex);
886 return ret;
887}
888
889int btrfs_write_inode(struct inode *inode, int wait)
890{
891 struct btrfs_root *root = BTRFS_I(inode)->root;
892 struct btrfs_trans_handle *trans;
893 int ret = 0;
894
895 if (wait) {
896 mutex_lock(&root->fs_info->fs_mutex);
897 trans = btrfs_start_transaction(root, 1);
898 btrfs_set_trans_block_group(trans, inode);
899 ret = btrfs_commit_transaction(trans, root);
900 mutex_unlock(&root->fs_info->fs_mutex);
901 }
902 return ret;
903}
904
905/*
54aa1f4d 906 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 907 * inode changes. But, it is most likely to find the inode in cache.
908 * FIXME, needs more benchmarking...there are no reasons other than performance
909 * to keep or drop this code.
910 */
911void btrfs_dirty_inode(struct inode *inode)
912{
913 struct btrfs_root *root = BTRFS_I(inode)->root;
914 struct btrfs_trans_handle *trans;
915
916 mutex_lock(&root->fs_info->fs_mutex);
917 trans = btrfs_start_transaction(root, 1);
918 btrfs_set_trans_block_group(trans, inode);
919 btrfs_update_inode(trans, root, inode);
920 btrfs_end_transaction(trans, root);
921 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 922}
923
924static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
925 struct btrfs_root *root,
926 u64 objectid,
927 struct btrfs_block_group_cache *group,
928 int mode)
929{
930 struct inode *inode;
931 struct btrfs_inode_item inode_item;
932 struct btrfs_key *location;
933 int ret;
934 int owner;
935
936 inode = new_inode(root->fs_info->sb);
937 if (!inode)
938 return ERR_PTR(-ENOMEM);
939
940 BTRFS_I(inode)->root = root;
941 if (mode & S_IFDIR)
942 owner = 0;
943 else
944 owner = 1;
945 group = btrfs_find_block_group(root, group, 0, 0, owner);
946 BTRFS_I(inode)->block_group = group;
947
948 inode->i_uid = current->fsuid;
949 inode->i_gid = current->fsgid;
950 inode->i_mode = mode;
951 inode->i_ino = objectid;
952 inode->i_blocks = 0;
953 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
954 fill_inode_item(&inode_item, inode);
955 location = &BTRFS_I(inode)->location;
956 location->objectid = objectid;
957 location->flags = 0;
958 location->offset = 0;
959 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
960
961 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
54aa1f4d
CM		 962 if (ret)
963 return ERR_PTR(ret);
39279cc3
CM		 964 insert_inode_hash(inode);
965 return inode;
966}
967
968static inline u8 btrfs_inode_type(struct inode *inode)
969{
970 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
971}
972
973static int btrfs_add_link(struct btrfs_trans_handle *trans,
974 struct dentry *dentry, struct inode *inode)
975{
976 int ret;
977 struct btrfs_key key;
978 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 979 struct inode *parent_inode;
39279cc3
CM		 980 key.objectid = inode->i_ino;
981 key.flags = 0;
982 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
983 key.offset = 0;
984
985 ret = btrfs_insert_dir_item(trans, root,
986 dentry->d_name.name, dentry->d_name.len,
987 dentry->d_parent->d_inode->i_ino,
988 &key, btrfs_inode_type(inode));
989 if (ret == 0) {
79c44584
CM		 990 parent_inode = dentry->d_parent->d_inode;
991 parent_inode->i_size += dentry->d_name.len * 2;
992 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 993 ret = btrfs_update_inode(trans, root,
994 dentry->d_parent->d_inode);
995 }
996 return ret;
997}
998
999static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1000 struct dentry *dentry, struct inode *inode)
1001{
1002 int err = btrfs_add_link(trans, dentry, inode);
1003 if (!err) {
1004 d_instantiate(dentry, inode);
1005 return 0;
1006 }
1007 if (err > 0)
1008 err = -EEXIST;
1009 return err;
1010}
1011
618e21d5
JB		 1012static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1013 int mode, dev_t rdev)
1014{
1015 struct btrfs_trans_handle *trans;
1016 struct btrfs_root *root = BTRFS_I(dir)->root;
1017 struct inode *inode;
1018 int err;
1019 int drop_inode = 0;
1020 u64 objectid;
1021
1022 if (!new_valid_dev(rdev))
1023 return -EINVAL;
1024
1025 mutex_lock(&root->fs_info->fs_mutex);
1026 trans = btrfs_start_transaction(root, 1);
1027 btrfs_set_trans_block_group(trans, dir);
1028
1029 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1030 if (err) {
1031 err = -ENOSPC;
1032 goto out_unlock;
1033 }
1034
1035 inode = btrfs_new_inode(trans, root, objectid,
1036 BTRFS_I(dir)->block_group, mode);
1037 err = PTR_ERR(inode);
1038 if (IS_ERR(inode))
1039 goto out_unlock;
1040
1041 btrfs_set_trans_block_group(trans, inode);
1042 err = btrfs_add_nondir(trans, dentry, inode);
1043 if (err)
1044 drop_inode = 1;
1045 else {
1046 inode->i_op = &btrfs_special_inode_operations;
1047 init_special_inode(inode, inode->i_mode, rdev);
1048 }
1049 dir->i_sb->s_dirt = 1;
1050 btrfs_update_inode_block_group(trans, inode);
1051 btrfs_update_inode_block_group(trans, dir);
1052out_unlock:
1053 btrfs_end_transaction(trans, root);
1054 mutex_unlock(&root->fs_info->fs_mutex);
1055
1056 if (drop_inode) {
1057 inode_dec_link_count(inode);
1058 iput(inode);
1059 }
1060 btrfs_btree_balance_dirty(root);
1061 return err;
1062}
1063
39279cc3
CM		 1064static int btrfs_create(struct inode *dir, struct dentry *dentry,
1065 int mode, struct nameidata *nd)
1066{
1067 struct btrfs_trans_handle *trans;
1068 struct btrfs_root *root = BTRFS_I(dir)->root;
1069 struct inode *inode;
1070 int err;
1071 int drop_inode = 0;
1072 u64 objectid;
1073
1074 mutex_lock(&root->fs_info->fs_mutex);
1075 trans = btrfs_start_transaction(root, 1);
1076 btrfs_set_trans_block_group(trans, dir);
1077
1078 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1079 if (err) {
1080 err = -ENOSPC;
1081 goto out_unlock;
1082 }
1083
1084 inode = btrfs_new_inode(trans, root, objectid,
1085 BTRFS_I(dir)->block_group, mode);
1086 err = PTR_ERR(inode);
1087 if (IS_ERR(inode))
1088 goto out_unlock;
1089
1090 btrfs_set_trans_block_group(trans, inode);
1091 err = btrfs_add_nondir(trans, dentry, inode);
1092 if (err)
1093 drop_inode = 1;
1094 else {
1095 inode->i_mapping->a_ops = &btrfs_aops;
1096 inode->i_fop = &btrfs_file_operations;
1097 inode->i_op = &btrfs_file_inode_operations;
1098 }
1099 dir->i_sb->s_dirt = 1;
1100 btrfs_update_inode_block_group(trans, inode);
1101 btrfs_update_inode_block_group(trans, dir);
1102out_unlock:
1103 btrfs_end_transaction(trans, root);
1104 mutex_unlock(&root->fs_info->fs_mutex);
1105
1106 if (drop_inode) {
1107 inode_dec_link_count(inode);
1108 iput(inode);
1109 }
1110 btrfs_btree_balance_dirty(root);
1111 return err;
1112}
1113
1114static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1115 struct dentry *dentry)
1116{
1117 struct btrfs_trans_handle *trans;
1118 struct btrfs_root *root = BTRFS_I(dir)->root;
1119 struct inode *inode = old_dentry->d_inode;
1120 int err;
1121 int drop_inode = 0;
1122
1123 if (inode->i_nlink == 0)
1124 return -ENOENT;
1125
1126 inc_nlink(inode);
1127 mutex_lock(&root->fs_info->fs_mutex);
1128 trans = btrfs_start_transaction(root, 1);
1129 btrfs_set_trans_block_group(trans, dir);
1130 atomic_inc(&inode->i_count);
1131 err = btrfs_add_nondir(trans, dentry, inode);
1132 if (err)
1133 drop_inode = 1;
1134 dir->i_sb->s_dirt = 1;
1135 btrfs_update_inode_block_group(trans, dir);
54aa1f4d
CM		 1136 err = btrfs_update_inode(trans, root, inode);
1137 if (err)
1138 drop_inode = 1;
39279cc3
CM		 1139
1140 btrfs_end_transaction(trans, root);
1141 mutex_unlock(&root->fs_info->fs_mutex);
1142
1143 if (drop_inode) {
1144 inode_dec_link_count(inode);
1145 iput(inode);
1146 }
1147 btrfs_btree_balance_dirty(root);
1148 return err;
1149}
1150
1151static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
1152 struct btrfs_root *root,
1153 u64 objectid, u64 dirid)
1154{
1155 int ret;
1156 char buf[2];
1157 struct btrfs_key key;
1158
1159 buf[0] = '.';
1160 buf[1] = '.';
1161
1162 key.objectid = objectid;
1163 key.offset = 0;
1164 key.flags = 0;
1165 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1166
1167 ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
1168 &key, BTRFS_FT_DIR);
1169 if (ret)
1170 goto error;
1171 key.objectid = dirid;
1172 ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
1173 &key, BTRFS_FT_DIR);
1174 if (ret)
1175 goto error;
1176error:
1177 return ret;
1178}
1179
1180static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1181{
1182 struct inode *inode;
1183 struct btrfs_trans_handle *trans;
1184 struct btrfs_root *root = BTRFS_I(dir)->root;
1185 int err = 0;
1186 int drop_on_err = 0;
1187 u64 objectid;
1188
1189 mutex_lock(&root->fs_info->fs_mutex);
1190 trans = btrfs_start_transaction(root, 1);
1191 btrfs_set_trans_block_group(trans, dir);
1192 if (IS_ERR(trans)) {
1193 err = PTR_ERR(trans);
1194 goto out_unlock;
1195 }
1196
1197 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1198 if (err) {
1199 err = -ENOSPC;
1200 goto out_unlock;
1201 }
1202
1203 inode = btrfs_new_inode(trans, root, objectid,
1204 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1205 if (IS_ERR(inode)) {
1206 err = PTR_ERR(inode);
1207 goto out_fail;
1208 }
1209 drop_on_err = 1;
1210 inode->i_op = &btrfs_dir_inode_operations;
1211 inode->i_fop = &btrfs_dir_file_operations;
1212 btrfs_set_trans_block_group(trans, inode);
1213
1214 err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
1215 if (err)
1216 goto out_fail;
1217
1218 inode->i_size = 6;
1219 err = btrfs_update_inode(trans, root, inode);
1220 if (err)
1221 goto out_fail;
1222 err = btrfs_add_link(trans, dentry, inode);
1223 if (err)
1224 goto out_fail;
1225 d_instantiate(dentry, inode);
1226 drop_on_err = 0;
1227 dir->i_sb->s_dirt = 1;
1228 btrfs_update_inode_block_group(trans, inode);
1229 btrfs_update_inode_block_group(trans, dir);
1230
1231out_fail:
1232 btrfs_end_transaction(trans, root);
1233out_unlock:
1234 mutex_unlock(&root->fs_info->fs_mutex);
1235 if (drop_on_err)
1236 iput(inode);
1237 btrfs_btree_balance_dirty(root);
1238 return err;
1239}
1240
1241/*
1242 * FIBMAP and others want to pass in a fake buffer head. They need to
1243 * use BTRFS_GET_BLOCK_NO_DIRECT to make sure we don't try to memcpy
1244 * any packed file data into the fake bh
1245 */
1246#define BTRFS_GET_BLOCK_NO_CREATE 0
1247#define BTRFS_GET_BLOCK_CREATE 1
1248#define BTRFS_GET_BLOCK_NO_DIRECT 2
1249
1250/*
1251 * FIXME create==1 doe not work.
1252 */
1253static int btrfs_get_block_lock(struct inode *inode, sector_t iblock,
1254 struct buffer_head *result, int create)
1255{
1256 int ret;
1257 int err = 0;
1258 u64 blocknr;
1259 u64 extent_start = 0;
1260 u64 extent_end = 0;
1261 u64 objectid = inode->i_ino;
1262 u32 found_type;
1263 u64 alloc_hint = 0;
1264 struct btrfs_path *path;
1265 struct btrfs_root *root = BTRFS_I(inode)->root;
1266 struct btrfs_file_extent_item *item;
1267 struct btrfs_leaf *leaf;
1268 struct btrfs_disk_key *found_key;
1269 struct btrfs_trans_handle *trans = NULL;
1270
1271 path = btrfs_alloc_path();
1272 BUG_ON(!path);
39279cc3 1273 if (create & BTRFS_GET_BLOCK_CREATE) {
9ebefb18
CM		 1274 /*
1275 * danger!, this only works if the page is properly up
1276 * to date somehow
1277 */
39279cc3
CM		 1278 trans = btrfs_start_transaction(root, 1);
1279 if (!trans) {
1280 err = -ENOMEM;
1281 goto out;
1282 }
1283 ret = btrfs_drop_extents(trans, root, inode,
1284 iblock << inode->i_blkbits,
1285 (iblock + 1) << inode->i_blkbits,
1286 &alloc_hint);
1287 BUG_ON(ret);
1288 }
1289
1290 ret = btrfs_lookup_file_extent(NULL, root, path,
f1ace244 1291 objectid,
39279cc3
CM		 1292 iblock << inode->i_blkbits, 0);
1293 if (ret < 0) {
1294 err = ret;
1295 goto out;
1296 }
1297
1298 if (ret != 0) {
1299 if (path->slots[0] == 0) {
1300 btrfs_release_path(root, path);
1301 goto not_found;
1302 }
1303 path->slots[0]--;
1304 }
1305
1306 item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
1307 struct btrfs_file_extent_item);
1308 leaf = btrfs_buffer_leaf(path->nodes[0]);
1309 blocknr = btrfs_file_extent_disk_blocknr(item);
1310 blocknr += btrfs_file_extent_offset(item);
1311
1312 /* are we inside the extent that was found? */
1313 found_key = &leaf->items[path->slots[0]].key;
1314 found_type = btrfs_disk_key_type(found_key);
1315 if (btrfs_disk_key_objectid(found_key) != objectid ||
1316 found_type != BTRFS_EXTENT_DATA_KEY) {
1317 extent_end = 0;
1318 extent_start = 0;
1319 goto not_found;
1320 }
1321 found_type = btrfs_file_extent_type(item);
1322 extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
1323 if (found_type == BTRFS_FILE_EXTENT_REG) {
1324 extent_start = extent_start >> inode->i_blkbits;
1325 extent_end = extent_start + btrfs_file_extent_num_blocks(item);
1326 err = 0;
1327 if (btrfs_file_extent_disk_blocknr(item) == 0)
1328 goto out;
1329 if (iblock >= extent_start && iblock < extent_end) {
1330 btrfs_map_bh_to_logical(root, result, blocknr +
1331 iblock - extent_start);
1332 goto out;
1333 }
1334 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1335 char *ptr;
1336 char *map;
1337 u32 size;
1338
1339 if (create & BTRFS_GET_BLOCK_NO_DIRECT) {
1340 err = -EINVAL;
1341 goto out;
1342 }
1343 size = btrfs_file_extent_inline_len(leaf->items +
1344 path->slots[0]);
1345 extent_end = (extent_start + size) >> inode->i_blkbits;
1346 extent_start >>= inode->i_blkbits;
1347 if (iblock < extent_start || iblock > extent_end) {
1348 goto not_found;
1349 }
1350 ptr = btrfs_file_extent_inline_start(item);
1351 map = kmap(result->b_page);
1352 memcpy(map, ptr, size);
1353 memset(map + size, 0, PAGE_CACHE_SIZE - size);
1354 flush_dcache_page(result->b_page);
1355 kunmap(result->b_page);
1356 set_buffer_uptodate(result);
1357 SetPageChecked(result->b_page);
1358 btrfs_map_bh_to_logical(root, result, 0);
1359 }
1360not_found:
1361 if (create & BTRFS_GET_BLOCK_CREATE) {
1362 struct btrfs_key ins;
1363 ret = btrfs_alloc_extent(trans, root, inode->i_ino,
6702ed49 1364 1, 0, alloc_hint, (u64)-1,
39279cc3 1365 &ins, 1);
54aa1f4d
CM		 1366 if (ret) {
1367 err = ret;
1368 goto out;
1369 }
39279cc3
CM		 1370 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
1371 iblock << inode->i_blkbits,
1372 ins.objectid, ins.offset,
1373 ins.offset);
54aa1f4d
CM		 1374 if (ret) {
1375 err = ret;
1376 goto out;
1377 }
39279cc3
CM		 1378 btrfs_map_bh_to_logical(root, result, ins.objectid);
1379 }
1380out:
54aa1f4d
CM		 1381 if (trans) {
1382 ret = btrfs_end_transaction(trans, root);
1383 if (!err)
1384 err = ret;
1385 }
39279cc3
CM		 1386 btrfs_free_path(path);
1387 return err;
1388}
1389
1390int btrfs_get_block(struct inode *inode, sector_t iblock,
1391 struct buffer_head *result, int create)
1392{
1393 int err;
1394 struct btrfs_root *root = BTRFS_I(inode)->root;
1395 mutex_lock(&root->fs_info->fs_mutex);
1396 err = btrfs_get_block_lock(inode, iblock, result, create);
1397 mutex_unlock(&root->fs_info->fs_mutex);
1398 return err;
1399}
1400
54aa1f4d
CM		 1401static int btrfs_get_block_csum(struct inode *inode, sector_t iblock,
1402 struct buffer_head *result, int create)
9ebefb18
CM		 1403{
1404 int ret;
1405 struct btrfs_root *root = BTRFS_I(inode)->root;
1406 struct page *page = result->b_page;
1407 u64 offset = (page->index << PAGE_CACHE_SHIFT) + bh_offset(result);
1408 struct btrfs_csum_item *item;
1409 struct btrfs_path *path = NULL;
1410
1411 mutex_lock(&root->fs_info->fs_mutex);
1412 ret = btrfs_get_block_lock(inode, iblock, result, create);
1413 if (ret)
1414 goto out;
1415
1416 path = btrfs_alloc_path();
1417 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, offset, 0);
1418 if (IS_ERR(item)) {
1419 ret = PTR_ERR(item);
1420 /* a csum that isn't present is a preallocated region. */
1421 if (ret == -ENOENT || ret == -EFBIG)
1422 ret = 0;
54aa1f4d 1423 result->b_private = NULL;
9ebefb18
CM		 1424 goto out;
1425 }
1426 memcpy((char *)&result->b_private, &item->csum, BTRFS_CRC32_SIZE);
9ebefb18
CM		 1427out:
1428 if (path)
1429 btrfs_free_path(path);
1430 mutex_unlock(&root->fs_info->fs_mutex);
1431 return ret;
1432}
1433
39279cc3
CM		 1434static int btrfs_get_block_bmap(struct inode *inode, sector_t iblock,
1435 struct buffer_head *result, int create)
1436{
1437 struct btrfs_root *root = BTRFS_I(inode)->root;
1438 mutex_lock(&root->fs_info->fs_mutex);
1439 btrfs_get_block_lock(inode, iblock, result, BTRFS_GET_BLOCK_NO_DIRECT);
1440 mutex_unlock(&root->fs_info->fs_mutex);
1441 return 0;
1442}
1443
1444static sector_t btrfs_bmap(struct address_space *as, sector_t block)
1445{
1446 return generic_block_bmap(as, block, btrfs_get_block_bmap);
1447}
1448
1449static int btrfs_prepare_write(struct file *file, struct page *page,
1450 unsigned from, unsigned to)
1451{
1452 return block_prepare_write(page, from, to, btrfs_get_block);
1453}
1454
9ebefb18
CM		 1455static void buffer_io_error(struct buffer_head *bh)
1456{
1457 char b[BDEVNAME_SIZE];
1458
1459 printk(KERN_ERR "Buffer I/O error on device %s, logical block %Lu\n",
1460 bdevname(bh->b_bdev, b),
1461 (unsigned long long)bh->b_blocknr);
1462}
1463
1464/*
1465 * I/O completion handler for block_read_full_page() - pages
1466 * which come unlocked at the end of I/O.
1467 */
1468static void btrfs_end_buffer_async_read(struct buffer_head *bh, int uptodate)
39279cc3 1469{
9ebefb18
CM		 1470 unsigned long flags;
1471 struct buffer_head *first;
1472 struct buffer_head *tmp;
1473 struct page *page;
1474 int page_uptodate = 1;
1475 struct inode *inode;
1476 int ret;
1477
1478 BUG_ON(!buffer_async_read(bh));
1479
1480 page = bh->b_page;
1481 inode = page->mapping->host;
1482 if (uptodate) {
1483 void *kaddr;
1484 struct btrfs_root *root = BTRFS_I(page->mapping->host)->root;
1485 if (bh->b_private) {
1486 char csum[BTRFS_CRC32_SIZE];
1487 kaddr = kmap_atomic(page, KM_IRQ0);
1488 ret = btrfs_csum_data(root, kaddr + bh_offset(bh),
1489 bh->b_size, csum);
1490 BUG_ON(ret);
1491 if (memcmp(csum, &bh->b_private, BTRFS_CRC32_SIZE)) {
1492 u64 offset;
1493 offset = (page->index << PAGE_CACHE_SHIFT) +
1494 bh_offset(bh);
1495 printk("btrfs csum failed ino %lu off %llu\n",
1496 page->mapping->host->i_ino,
1497 (unsigned long long)offset);
1498 memset(kaddr + bh_offset(bh), 1, bh->b_size);
1499 flush_dcache_page(page);
9ebefb18
CM		 1500 }
1501 kunmap_atomic(kaddr, KM_IRQ0);
1502 }
1503 set_buffer_uptodate(bh);
1504 } else {
1505 clear_buffer_uptodate(bh);
1506 if (printk_ratelimit())
1507 buffer_io_error(bh);
1508 SetPageError(page);
1509 }
1510
1511 /*
1512 * Be _very_ careful from here on. Bad things can happen if
1513 * two buffer heads end IO at almost the same time and both
1514 * decide that the page is now completely done.
1515 */
1516 first = page_buffers(page);
1517 local_irq_save(flags);
1518 bit_spin_lock(BH_Uptodate_Lock, &first->b_state);
1519 clear_buffer_async_read(bh);
1520 unlock_buffer(bh);
1521 tmp = bh;
1522 do {
1523 if (!buffer_uptodate(tmp))
1524 page_uptodate = 0;
1525 if (buffer_async_read(tmp)) {
1526 BUG_ON(!buffer_locked(tmp));
1527 goto still_busy;
1528 }
1529 tmp = tmp->b_this_page;
1530 } while (tmp != bh);
1531 bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
1532 local_irq_restore(flags);
1533
1534 /*
1535 * If none of the buffers had errors and they are all
1536 * uptodate then we can set the page uptodate.
1537 */
1538 if (page_uptodate && !PageError(page))
1539 SetPageUptodate(page);
1540 unlock_page(page);
1541 return;
1542
1543still_busy:
1544 bit_spin_unlock(BH_Uptodate_Lock, &first->b_state);
1545 local_irq_restore(flags);
1546 return;
1547}
1548
1549/*
1550 * Generic "read page" function for block devices that have the normal
1551 * get_block functionality. This is most of the block device filesystems.
1552 * Reads the page asynchronously --- the unlock_buffer() and
1553 * set/clear_buffer_uptodate() functions propagate buffer state into the
1554 * page struct once IO has completed.
1555 */
1556int btrfs_readpage(struct file *file, struct page *page)
1557{
1558 struct inode *inode = page->mapping->host;
1559 sector_t iblock, lblock;
1560 struct buffer_head *bh, *head, *arr[MAX_BUF_PER_PAGE];
1561 unsigned int blocksize;
1562 int nr, i;
1563 int fully_mapped = 1;
1564
1565 BUG_ON(!PageLocked(page));
1566 blocksize = 1 << inode->i_blkbits;
1567 if (!page_has_buffers(page))
1568 create_empty_buffers(page, blocksize, 0);
1569 head = page_buffers(page);
1570
1571 iblock = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
1572 lblock = (i_size_read(inode)+blocksize-1) >> inode->i_blkbits;
1573 bh = head;
1574 nr = 0;
1575 i = 0;
1576
1577 do {
1578 if (buffer_uptodate(bh))
1579 continue;
1580
1581 if (!buffer_mapped(bh)) {
1582 int err = 0;
1583
1584 fully_mapped = 0;
1585 if (iblock < lblock) {
1586 WARN_ON(bh->b_size != blocksize);
1587 err = btrfs_get_block_csum(inode, iblock,
1588 bh, 0);
1589 if (err)
1590 SetPageError(page);
1591 }
1592 if (!buffer_mapped(bh)) {
1593 void *kaddr = kmap_atomic(page, KM_USER0);
1594 memset(kaddr + i * blocksize, 0, blocksize);
1595 flush_dcache_page(page);
1596 kunmap_atomic(kaddr, KM_USER0);
1597 if (!err)
1598 set_buffer_uptodate(bh);
1599 continue;
1600 }
1601 /*
1602 * get_block() might have updated the buffer
1603 * synchronously
1604 */
1605 if (buffer_uptodate(bh))
1606 continue;
1607 }
1608 arr[nr++] = bh;
1609 } while (i++, iblock++, (bh = bh->b_this_page) != head);
1610
1611 if (fully_mapped)
1612 SetPageMappedToDisk(page);
1613
1614 if (!nr) {
1615 /*
1616 * All buffers are uptodate - we can set the page uptodate
1617 * as well. But not if get_block() returned an error.
1618 */
1619 if (!PageError(page))
1620 SetPageUptodate(page);
1621 unlock_page(page);
1622 return 0;
1623 }
1624
1625 /* Stage two: lock the buffers */
1626 for (i = 0; i < nr; i++) {
1627 bh = arr[i];
1628 lock_buffer(bh);
1629 bh->b_end_io = btrfs_end_buffer_async_read;
1630 set_buffer_async_read(bh);
1631 }
1632
1633 /*
1634 * Stage 3: start the IO. Check for uptodateness
1635 * inside the buffer lock in case another process reading
1636 * the underlying blockdev brought it uptodate (the sct fix).
1637 */
1638 for (i = 0; i < nr; i++) {
1639 bh = arr[i];
1640 if (buffer_uptodate(bh))
1641 btrfs_end_buffer_async_read(bh, 1);
1642 else
1643 submit_bh(READ, bh);
1644 }
1645 return 0;
39279cc3
CM		 1646}
1647
1648/*
1649 * Aside from a tiny bit of packed file data handling, this is the
1650 * same as the generic code.
1651 *
1652 * While block_write_full_page is writing back the dirty buffers under
1653 * the page lock, whoever dirtied the buffers may decide to clean them
1654 * again at any time. We handle that by only looking at the buffer
1655 * state inside lock_buffer().
1656 *
1657 * If block_write_full_page() is called for regular writeback
1658 * (wbc->sync_mode == WB_SYNC_NONE) then it will redirty a page which has a
1659 * locked buffer. This only can happen if someone has written the buffer
1660 * directly, with submit_bh(). At the address_space level PageWriteback
1661 * prevents this contention from occurring.
1662 */
1663static int __btrfs_write_full_page(struct inode *inode, struct page *page,
1664 struct writeback_control *wbc)
1665{
1666 int err;
1667 sector_t block;
1668 sector_t last_block;
1669 struct buffer_head *bh, *head;
1670 const unsigned blocksize = 1 << inode->i_blkbits;
1671 int nr_underway = 0;
9ebefb18 1672 struct btrfs_root *root = BTRFS_I(inode)->root;
39279cc3
CM		 1673
1674 BUG_ON(!PageLocked(page));
1675
1676 last_block = (i_size_read(inode) - 1) >> inode->i_blkbits;
1677
8c2383c3
CM		 1678 /* no csumming allowed when from PF_MEMALLOC */
1679 if (current->flags & PF_MEMALLOC) {
1680 redirty_page_for_writepage(wbc, page);
1681 unlock_page(page);
1682 return 0;
1683 }
1684
39279cc3
CM		 1685 if (!page_has_buffers(page)) {
1686 create_empty_buffers(page, blocksize,
1687 (1 << BH_Dirty)|(1 << BH_Uptodate));
1688 }
1689
1690 /*
1691 * Be very careful. We have no exclusion from __set_page_dirty_buffers
1692 * here, and the (potentially unmapped) buffers may become dirty at
1693 * any time. If a buffer becomes dirty here after we've inspected it
1694 * then we just miss that fact, and the page stays dirty.
1695 *
1696 * Buffers outside i_size may be dirtied by __set_page_dirty_buffers;
1697 * handle that here by just cleaning them.
1698 */
1699
1700 block = (sector_t)page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
1701 head = page_buffers(page);
1702 bh = head;
1703
1704 /*
1705 * Get all the dirty buffers mapped to disk addresses and
1706 * handle any aliases from the underlying blockdev's mapping.
1707 */
1708 do {
1709 if (block > last_block) {
1710 /*
1711 * mapped buffers outside i_size will occur, because
1712 * this page can be outside i_size when there is a
1713 * truncate in progress.
1714 */
1715 /*
1716 * The buffer was zeroed by block_write_full_page()
1717 */
1718 clear_buffer_dirty(bh);
1719 set_buffer_uptodate(bh);
1720 } else if (!buffer_mapped(bh) && buffer_dirty(bh)) {
1721 WARN_ON(bh->b_size != blocksize);
1722 err = btrfs_get_block(inode, block, bh, 0);
1723 if (err) {
1724 goto recover;
1725 }
1726 if (buffer_new(bh)) {
1727 /* blockdev mappings never come here */
1728 clear_buffer_new(bh);
1729 }
1730 }
1731 bh = bh->b_this_page;
1732 block++;
1733 } while (bh != head);
1734
1735 do {
1736 if (!buffer_mapped(bh))
1737 continue;
1738 /*
1739 * If it's a fully non-blocking write attempt and we cannot
1740 * lock the buffer then redirty the page. Note that this can
1741 * potentially cause a busy-wait loop from pdflush and kswapd
1742 * activity, but those code paths have their own higher-level
1743 * throttling.
1744 */
1745 if (wbc->sync_mode != WB_SYNC_NONE || !wbc->nonblocking) {
1746 lock_buffer(bh);
1747 } else if (test_set_buffer_locked(bh)) {
1748 redirty_page_for_writepage(wbc, page);
1749 continue;
1750 }
1751 if (test_clear_buffer_dirty(bh) && bh->b_blocknr != 0) {
9ebefb18
CM		 1752 struct btrfs_trans_handle *trans;
1753 int ret;
1754 u64 off = page->index << PAGE_CACHE_SHIFT;
1755 char *kaddr;
1756
1757 off += bh_offset(bh);
1758 mutex_lock(&root->fs_info->fs_mutex);
1759 trans = btrfs_start_transaction(root, 1);
1760 btrfs_set_trans_block_group(trans, inode);
1761 kaddr = kmap(page);
54aa1f4d 1762 btrfs_csum_file_block(trans, root, inode->i_ino,
9ebefb18
CM		 1763 off, kaddr + bh_offset(bh),
1764 bh->b_size);
1765 kunmap(page);
9ebefb18
CM		 1766 ret = btrfs_end_transaction(trans, root);
1767 BUG_ON(ret);
1768 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1769 mark_buffer_async_write(bh);
1770 } else {
1771 unlock_buffer(bh);
1772 }
1773 } while ((bh = bh->b_this_page) != head);
1774
1775 /*
1776 * The page and its buffers are protected by PageWriteback(), so we can
1777 * drop the bh refcounts early.
1778 */
1779 BUG_ON(PageWriteback(page));
1780 set_page_writeback(page);
1781
1782 do {
1783 struct buffer_head *next = bh->b_this_page;
1784 if (buffer_async_write(bh)) {
1785 submit_bh(WRITE, bh);
1786 nr_underway++;
1787 }
1788 bh = next;
1789 } while (bh != head);
1790 unlock_page(page);
1791
1792 err = 0;
1793done:
1794 if (nr_underway == 0) {
1795 /*
1796 * The page was marked dirty, but the buffers were
1797 * clean. Someone wrote them back by hand with
1798 * ll_rw_block/submit_bh. A rare case.
1799 */
1800 int uptodate = 1;
1801 do {
1802 if (!buffer_uptodate(bh)) {
1803 uptodate = 0;
1804 break;
1805 }
1806 bh = bh->b_this_page;
1807 } while (bh != head);
1808 if (uptodate)
1809 SetPageUptodate(page);
1810 end_page_writeback(page);
1811 }
1812 return err;
1813
1814recover:
1815 /*
1816 * ENOSPC, or some other error. We may already have added some
1817 * blocks to the file, so we need to write these out to avoid
1818 * exposing stale data.
1819 * The page is currently locked and not marked for writeback
1820 */
1821 bh = head;
1822 /* Recovery: lock and submit the mapped buffers */
1823 do {
1824 if (buffer_mapped(bh) && buffer_dirty(bh)) {
1825 lock_buffer(bh);
1826 mark_buffer_async_write(bh);
1827 } else {
1828 /*
1829 * The buffer may have been set dirty during
1830 * attachment to a dirty page.
1831 */
1832 clear_buffer_dirty(bh);
1833 }
1834 } while ((bh = bh->b_this_page) != head);
1835 SetPageError(page);
1836 BUG_ON(PageWriteback(page));
1837 set_page_writeback(page);
1838 do {
1839 struct buffer_head *next = bh->b_this_page;
1840 if (buffer_async_write(bh)) {
1841 clear_buffer_dirty(bh);
1842 submit_bh(WRITE, bh);
1843 nr_underway++;
1844 }
1845 bh = next;
1846 } while (bh != head);
1847 unlock_page(page);
1848 goto done;
1849}
1850
1851static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
1852{
1853 struct inode * const inode = page->mapping->host;
1854 loff_t i_size = i_size_read(inode);
1855 const pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT;
1856 unsigned offset;
1857 void *kaddr;
1858
1859 /* Is the page fully inside i_size? */
1860 if (page->index < end_index)
1861 return __btrfs_write_full_page(inode, page, wbc);
1862
1863 /* Is the page fully outside i_size? (truncate in progress) */
1864 offset = i_size & (PAGE_CACHE_SIZE-1);
1865 if (page->index >= end_index+1 || !offset) {
1866 /*
1867 * The page may have dirty, unmapped buffers. For example,
1868 * they may have been added in ext3_writepage(). Make them
1869 * freeable here, so the page does not leak.
1870 */
1871 block_invalidatepage(page, 0);
1872 unlock_page(page);
1873 return 0; /* don't care */
1874 }
1875
1876 /*
1877 * The page straddles i_size. It must be zeroed out on each and every
1878 * writepage invokation because it may be mmapped. "A file is mapped
1879 * in multiples of the page size. For a file that is not a multiple of
1880 * the page size, the remaining memory is zeroed when mapped, and
1881 * writes to that region are not written out to the file."
1882 */
1883 kaddr = kmap_atomic(page, KM_USER0);
1884 memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
1885 flush_dcache_page(page);
1886 kunmap_atomic(kaddr, KM_USER0);
1887 return __btrfs_write_full_page(inode, page, wbc);
1888}
1889
9ebefb18
CM		 1890/*
1891 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1892 * called from a page fault handler when a page is first dirtied. Hence we must
1893 * be careful to check for EOF conditions here. We set the page up correctly
1894 * for a written page which means we get ENOSPC checking when writing into
1895 * holes and correct delalloc and unwritten extent mapping on filesystems that
1896 * support these features.
1897 *
1898 * We are not allowed to take the i_mutex here so we have to play games to
1899 * protect against truncate races as the page could now be beyond EOF. Because
1900 * vmtruncate() writes the inode size before removing pages, once we have the
1901 * page lock we can determine safely if the page is beyond EOF. If it is not
1902 * beyond EOF, then the page is guaranteed safe against truncation until we
1903 * unlock the page.
1904 */
1905int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
1906{
1907 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
1908 unsigned long end;
1909 loff_t size;
1910 int ret = -EINVAL;
1911
1912 lock_page(page);
1913 wait_on_page_writeback(page);
9ebefb18
CM		 1914 size = i_size_read(inode);
1915 if ((page->mapping != inode->i_mapping) ||
1916 ((page->index << PAGE_CACHE_SHIFT) > size)) {
1917 /* page got truncated out from underneath us */
1918 goto out_unlock;
1919 }
1920
1921 /* page is wholly or partially inside EOF */
1922 if (((page->index + 1) << PAGE_CACHE_SHIFT) > size)
1923 end = size & ~PAGE_CACHE_MASK;
1924 else
1925 end = PAGE_CACHE_SIZE;
1926
1927 ret = btrfs_prepare_write(NULL, page, 0, end);
1928 if (!ret)
1929 ret = btrfs_commit_write(NULL, page, 0, end);
1930
1931out_unlock:
1932 unlock_page(page);
1933 return ret;
1934}
1935
39279cc3
CM		 1936static void btrfs_truncate(struct inode *inode)
1937{
1938 struct btrfs_root *root = BTRFS_I(inode)->root;
1939 int ret;
1940 struct btrfs_trans_handle *trans;
1941
1942 if (!S_ISREG(inode->i_mode))
1943 return;
1944 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1945 return;
1946
1947 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1948
1949 mutex_lock(&root->fs_info->fs_mutex);
1950 trans = btrfs_start_transaction(root, 1);
1951 btrfs_set_trans_block_group(trans, inode);
1952
1953 /* FIXME, add redo link to tree so we don't leak on crash */
1954 ret = btrfs_truncate_in_trans(trans, root, inode);
39279cc3
CM		 1955 btrfs_update_inode(trans, root, inode);
1956 ret = btrfs_end_transaction(trans, root);
1957 BUG_ON(ret);
1958 mutex_unlock(&root->fs_info->fs_mutex);
1959 btrfs_btree_balance_dirty(root);
1960}
1961
1962int btrfs_commit_write(struct file *file, struct page *page,
1963 unsigned from, unsigned to)
1964{
1965 struct inode *inode = page->mapping->host;
1966 struct buffer_head *bh;
1967 loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
1968
1969 SetPageUptodate(page);
1970 bh = page_buffers(page);
1971 set_buffer_uptodate(bh);
1972 if (buffer_mapped(bh) && bh->b_blocknr != 0) {
1973 set_page_dirty(page);
1974 }
1975 if (pos > inode->i_size) {
1976 i_size_write(inode, pos);
1977 mark_inode_dirty(inode);
1978 }
1979 return 0;
1980}
1981
1982static int create_subvol(struct btrfs_root *root, char *name, int namelen)
1983{
1984 struct btrfs_trans_handle *trans;
1985 struct btrfs_key key;
1986 struct btrfs_root_item root_item;
1987 struct btrfs_inode_item *inode_item;
1988 struct buffer_head *subvol;
1989 struct btrfs_leaf *leaf;
1990 struct btrfs_root *new_root;
1991 struct inode *inode;
1992 struct inode *dir;
1993 int ret;
54aa1f4d 1994 int err;
39279cc3
CM		 1995 u64 objectid;
1996 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
1997
1998 mutex_lock(&root->fs_info->fs_mutex);
1999 trans = btrfs_start_transaction(root, 1);
2000 BUG_ON(!trans);
2001
6702ed49 2002 subvol = btrfs_alloc_free_block(trans, root, 0, 0);
54aa1f4d
CM		 2003 if (IS_ERR(subvol))
2004 return PTR_ERR(subvol);
39279cc3
CM		 2005 leaf = btrfs_buffer_leaf(subvol);
2006 btrfs_set_header_nritems(&leaf->header, 0);
2007 btrfs_set_header_level(&leaf->header, 0);
2008 btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
2009 btrfs_set_header_generation(&leaf->header, trans->transid);
2010 btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
2011 memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
2012 sizeof(leaf->header.fsid));
ccd467d6 2013 btrfs_mark_buffer_dirty(subvol);
39279cc3
CM		 2014
2015 inode_item = &root_item.inode;
2016 memset(inode_item, 0, sizeof(*inode_item));
2017 btrfs_set_inode_generation(inode_item, 1);
2018 btrfs_set_inode_size(inode_item, 3);
2019 btrfs_set_inode_nlink(inode_item, 1);
2020 btrfs_set_inode_nblocks(inode_item, 1);
2021 btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
2022
2023 btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
2024 btrfs_set_root_refs(&root_item, 1);
5eda7b5e
CM		 2025 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
2026 root_item.drop_level = 0;
39279cc3
CM		 2027 brelse(subvol);
2028 subvol = NULL;
2029
2030 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2031 0, &objectid);
54aa1f4d
CM		 2032 if (ret)
2033 goto fail;
39279cc3
CM		 2034
2035 btrfs_set_root_dirid(&root_item, new_dirid);
2036
2037 key.objectid = objectid;
2038 key.offset = 1;
2039 key.flags = 0;
2040 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2041 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2042 &root_item);
54aa1f4d
CM		 2043 if (ret)
2044 goto fail;
39279cc3
CM		 2045
2046 /*
2047 * insert the directory item
2048 */
2049 key.offset = (u64)-1;
2050 dir = root->fs_info->sb->s_root->d_inode;
2051 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2052 name, namelen, dir->i_ino, &key,
2053 BTRFS_FT_DIR);
54aa1f4d
CM		 2054 if (ret)
2055 goto fail;
39279cc3
CM		 2056
2057 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 2058 if (ret)
2059 goto fail_commit;
39279cc3
CM		 2060
2061 new_root = btrfs_read_fs_root(root->fs_info, &key);
2062 BUG_ON(!new_root);
2063
2064 trans = btrfs_start_transaction(new_root, 1);
2065 BUG_ON(!trans);
2066
2067 inode = btrfs_new_inode(trans, new_root, new_dirid,
2068 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 2069 if (IS_ERR(inode))
2070 goto fail;
39279cc3
CM		 2071 inode->i_op = &btrfs_dir_inode_operations;
2072 inode->i_fop = &btrfs_dir_file_operations;
34088780 2073 new_root->inode = inode;
39279cc3
CM		 2074
2075 ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
54aa1f4d
CM		 2076 if (ret)
2077 goto fail;
39279cc3
CM		 2078
2079 inode->i_nlink = 1;
2080 inode->i_size = 6;
2081 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 2082 if (ret)
2083 goto fail;
2084fail:
2085 err = btrfs_commit_transaction(trans, root);
2086 if (err && !ret)
2087 ret = err;
2088fail_commit:
39279cc3
CM		 2089 mutex_unlock(&root->fs_info->fs_mutex);
2090 btrfs_btree_balance_dirty(root);
54aa1f4d 2091 return ret;
39279cc3
CM		 2092}
2093
2094static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
2095{
2096 struct btrfs_trans_handle *trans;
2097 struct btrfs_key key;
2098 struct btrfs_root_item new_root_item;
2099 int ret;
54aa1f4d 2100 int err;
39279cc3
CM		 2101 u64 objectid;
2102
2103 if (!root->ref_cows)
2104 return -EINVAL;
2105
2106 mutex_lock(&root->fs_info->fs_mutex);
2107 trans = btrfs_start_transaction(root, 1);
2108 BUG_ON(!trans);
2109
2110 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d
CM		 2111 if (ret)
2112 goto fail;
39279cc3
CM		 2113
2114 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
2115 0, &objectid);
54aa1f4d
CM		 2116 if (ret)
2117 goto fail;
39279cc3
CM		 2118
2119 memcpy(&new_root_item, &root->root_item,
2120 sizeof(new_root_item));
2121
2122 key.objectid = objectid;
2123 key.offset = 1;
2124 key.flags = 0;
2125 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
2126 btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node));
2127
2128 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
2129 &new_root_item);
54aa1f4d
CM		 2130 if (ret)
2131 goto fail;
39279cc3
CM		 2132
2133 /*
2134 * insert the directory item
2135 */
2136 key.offset = (u64)-1;
2137 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
2138 name, namelen,
2139 root->fs_info->sb->s_root->d_inode->i_ino,
2140 &key, BTRFS_FT_DIR);
2141
54aa1f4d
CM		 2142 if (ret)
2143 goto fail;
39279cc3
CM		 2144
2145 ret = btrfs_inc_root_ref(trans, root);
54aa1f4d
CM		 2146 if (ret)
2147 goto fail;
39279cc3 2148
54aa1f4d
CM		 2149fail:
2150 err = btrfs_commit_transaction(trans, root);
2151 if (err && !ret)
2152 ret = err;
39279cc3
CM		 2153 mutex_unlock(&root->fs_info->fs_mutex);
2154 btrfs_btree_balance_dirty(root);
54aa1f4d 2155 return ret;
39279cc3
CM		 2156}
2157
2158int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int
2159 cmd, unsigned long arg)
2160{
2161 struct btrfs_root *root = BTRFS_I(inode)->root;
2162 struct btrfs_ioctl_vol_args vol_args;
2163 int ret = 0;
2164 struct btrfs_dir_item *di;
2165 int namelen;
2166 struct btrfs_path *path;
2167 u64 root_dirid;
2168
2169 switch (cmd) {
2170 case BTRFS_IOC_SNAP_CREATE:
2171 if (copy_from_user(&vol_args,
2172 (struct btrfs_ioctl_vol_args __user *)arg,
2173 sizeof(vol_args)))
2174 return -EFAULT;
2175 namelen = strlen(vol_args.name);
2176 if (namelen > BTRFS_VOL_NAME_MAX)
2177 return -EINVAL;
8a712645
CM		 2178 if (strchr(vol_args.name, '/'))
2179 return -EINVAL;
39279cc3
CM		 2180 path = btrfs_alloc_path();
2181 if (!path)
2182 return -ENOMEM;
2183 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2184 mutex_lock(&root->fs_info->fs_mutex);
2185 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2186 path, root_dirid,
2187 vol_args.name, namelen, 0);
2188 mutex_unlock(&root->fs_info->fs_mutex);
2189 btrfs_free_path(path);
2190 if (di && !IS_ERR(di))
2191 return -EEXIST;
54aa1f4d
CM		 2192 if (IS_ERR(di))
2193 return PTR_ERR(di);
39279cc3
CM		 2194
2195 if (root == root->fs_info->tree_root)
2196 ret = create_subvol(root, vol_args.name, namelen);
2197 else
2198 ret = create_snapshot(root, vol_args.name, namelen);
39279cc3 2199 break;
6702ed49
CM		 2200
2201 case BTRFS_IOC_DEFRAG:
2202 mutex_lock(&root->fs_info->fs_mutex);
e9d0b13b
CM		 2203 btrfs_defrag_root(root, 0);
2204 btrfs_defrag_root(root->fs_info->extent_root, 0);
6702ed49
CM		 2205 mutex_unlock(&root->fs_info->fs_mutex);
2206 ret = 0;
2207 break;
39279cc3
CM		 2208 default:
2209 return -ENOTTY;
2210 }
2211 return ret;
2212}
2213
2214#ifdef CONFIG_COMPAT
2215long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
2216 unsigned long arg)
2217{
2218 struct inode *inode = file->f_path.dentry->d_inode;
2219 int ret;
2220 lock_kernel();
2221 ret = btrfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
2222 unlock_kernel();
2223 return ret;
2224
2225}
2226#endif
2227
2228/*
2229 * Called inside transaction, so use GFP_NOFS
2230 */
2231struct inode *btrfs_alloc_inode(struct super_block *sb)
2232{
2233 struct btrfs_inode *ei;
2234
2235 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2236 if (!ei)
2237 return NULL;
15ee9bc7 2238 ei->last_trans = 0;
39279cc3
CM		 2239 return &ei->vfs_inode;
2240}
2241
2242void btrfs_destroy_inode(struct inode *inode)
2243{
2244 WARN_ON(!list_empty(&inode->i_dentry));
2245 WARN_ON(inode->i_data.nrpages);
2246
2247 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2248}
2249
2250static void init_once(void * foo, struct kmem_cache * cachep,
2251 unsigned long flags)
2252{
2253 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2254
2255 inode_init_once(&ei->vfs_inode);
2256}
2257
2258void btrfs_destroy_cachep(void)
2259{
2260 if (btrfs_inode_cachep)
2261 kmem_cache_destroy(btrfs_inode_cachep);
2262 if (btrfs_trans_handle_cachep)
2263 kmem_cache_destroy(btrfs_trans_handle_cachep);
2264 if (btrfs_transaction_cachep)
2265 kmem_cache_destroy(btrfs_transaction_cachep);
2266 if (btrfs_bit_radix_cachep)
2267 kmem_cache_destroy(btrfs_bit_radix_cachep);
2268 if (btrfs_path_cachep)
2269 kmem_cache_destroy(btrfs_path_cachep);
2270}
2271
92fee66d
CM		 2272static struct kmem_cache *cache_create(const char *name, size_t size,
2273 unsigned long extra_flags,
2274 void (*ctor)(void *, struct kmem_cache *,
2275 unsigned long))
2276{
2277 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2278 SLAB_MEM_SPREAD | extra_flags), ctor
2279#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2280 ,NULL
2281#endif
2282 );
2283}
2284
39279cc3
CM		 2285int btrfs_init_cachep(void)
2286{
92fee66d
CM		 2287 btrfs_inode_cachep = cache_create("btrfs_inode_cache",
2288 sizeof(struct btrfs_inode),
2289 0, init_once);
39279cc3
CM		 2290 if (!btrfs_inode_cachep)
2291 goto fail;
92fee66d 2292 btrfs_trans_handle_cachep = cache_create("btrfs_trans_handle_cache",
39279cc3 2293 sizeof(struct btrfs_trans_handle),
92fee66d 2294 0, NULL);
39279cc3
CM		 2295 if (!btrfs_trans_handle_cachep)
2296 goto fail;
92fee66d 2297 btrfs_transaction_cachep = cache_create("btrfs_transaction_cache",
39279cc3 2298 sizeof(struct btrfs_transaction),
92fee66d 2299 0, NULL);
39279cc3
CM		 2300 if (!btrfs_transaction_cachep)
2301 goto fail;
92fee66d
CM		 2302 btrfs_path_cachep = cache_create("btrfs_path_cache",
2303 sizeof(struct btrfs_transaction),
2304 0, NULL);
39279cc3
CM		 2305 if (!btrfs_path_cachep)
2306 goto fail;
92fee66d
CM		 2307 btrfs_bit_radix_cachep = cache_create("btrfs_radix", 256,
2308 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2309 if (!btrfs_bit_radix_cachep)
2310 goto fail;
2311 return 0;
2312fail:
2313 btrfs_destroy_cachep();
2314 return -ENOMEM;
2315}
2316
2317static int btrfs_getattr(struct vfsmount *mnt,
2318 struct dentry *dentry, struct kstat *stat)
2319{
2320 struct inode *inode = dentry->d_inode;
2321 generic_fillattr(inode, stat);
2322 stat->blksize = 256 * 1024;
2323 return 0;
2324}
2325
2326static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2327 struct inode * new_dir,struct dentry *new_dentry)
2328{
2329 struct btrfs_trans_handle *trans;
2330 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2331 struct inode *new_inode = new_dentry->d_inode;
2332 struct inode *old_inode = old_dentry->d_inode;
2333 struct timespec ctime = CURRENT_TIME;
2334 struct btrfs_path *path;
2335 struct btrfs_dir_item *di;
2336 int ret;
2337
2338 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2339 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2340 return -ENOTEMPTY;
2341 }
2342 mutex_lock(&root->fs_info->fs_mutex);
2343 trans = btrfs_start_transaction(root, 1);
2344 btrfs_set_trans_block_group(trans, new_dir);
2345 path = btrfs_alloc_path();
2346 if (!path) {
2347 ret = -ENOMEM;
2348 goto out_fail;
2349 }
2350
2351 old_dentry->d_inode->i_nlink++;
2352 old_dir->i_ctime = old_dir->i_mtime = ctime;
2353 new_dir->i_ctime = new_dir->i_mtime = ctime;
2354 old_inode->i_ctime = ctime;
2355 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
2356 struct btrfs_key *location = &BTRFS_I(new_dir)->location;
2357 u64 old_parent_oid;
2358 di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
2359 "..", 2, -1);
2360 if (IS_ERR(di)) {
2361 ret = PTR_ERR(di);
2362 goto out_fail;
2363 }
2364 if (!di) {
2365 ret = -ENOENT;
2366 goto out_fail;
2367 }
2368 old_parent_oid = btrfs_disk_key_objectid(&di->location);
2369 ret = btrfs_del_item(trans, root, path);
2370 if (ret) {
39279cc3
CM		 2371 goto out_fail;
2372 }
2373 btrfs_release_path(root, path);
2374
2375 di = btrfs_lookup_dir_index_item(trans, root, path,
2376 old_inode->i_ino,
2377 old_parent_oid,
2378 "..", 2, -1);
2379 if (IS_ERR(di)) {
2380 ret = PTR_ERR(di);
2381 goto out_fail;
2382 }
2383 if (!di) {
2384 ret = -ENOENT;
2385 goto out_fail;
2386 }
2387 ret = btrfs_del_item(trans, root, path);
2388 if (ret) {
39279cc3
CM		 2389 goto out_fail;
2390 }
2391 btrfs_release_path(root, path);
2392
2393 ret = btrfs_insert_dir_item(trans, root, "..", 2,
2394 old_inode->i_ino, location,
2395 BTRFS_FT_DIR);
2396 if (ret)
2397 goto out_fail;
2398 }
2399
2400
2401 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2402 if (ret)
2403 goto out_fail;
2404
2405 if (new_inode) {
2406 new_inode->i_ctime = CURRENT_TIME;
2407 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2408 if (ret)
2409 goto out_fail;
2410 if (S_ISDIR(new_inode->i_mode))
2411 clear_nlink(new_inode);
2412 else
2413 drop_nlink(new_inode);
54aa1f4d
CM		 2414 ret = btrfs_update_inode(trans, root, new_inode);
2415 if (ret)
2416 goto out_fail;
39279cc3
CM		 2417 }
2418 ret = btrfs_add_link(trans, new_dentry, old_inode);
2419 if (ret)
2420 goto out_fail;
2421
2422out_fail:
2423 btrfs_free_path(path);
2424 btrfs_end_transaction(trans, root);
2425 mutex_unlock(&root->fs_info->fs_mutex);
2426 return ret;
2427}
2428
2429static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2430 const char *symname)
2431{
2432 struct btrfs_trans_handle *trans;
2433 struct btrfs_root *root = BTRFS_I(dir)->root;
2434 struct btrfs_path *path;
2435 struct btrfs_key key;
2436 struct inode *inode;
2437 int err;
2438 int drop_inode = 0;
2439 u64 objectid;
2440 int name_len;
2441 int datasize;
2442 char *ptr;
2443 struct btrfs_file_extent_item *ei;
2444
2445 name_len = strlen(symname) + 1;
2446 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2447 return -ENAMETOOLONG;
2448 mutex_lock(&root->fs_info->fs_mutex);
2449 trans = btrfs_start_transaction(root, 1);
2450 btrfs_set_trans_block_group(trans, dir);
2451
2452 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2453 if (err) {
2454 err = -ENOSPC;
2455 goto out_unlock;
2456 }
2457
2458 inode = btrfs_new_inode(trans, root, objectid,
2459 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2460 err = PTR_ERR(inode);
2461 if (IS_ERR(inode))
2462 goto out_unlock;
2463
2464 btrfs_set_trans_block_group(trans, inode);
2465 err = btrfs_add_nondir(trans, dentry, inode);
2466 if (err)
2467 drop_inode = 1;
2468 else {
2469 inode->i_mapping->a_ops = &btrfs_aops;
2470 inode->i_fop = &btrfs_file_operations;
2471 inode->i_op = &btrfs_file_inode_operations;
2472 }
2473 dir->i_sb->s_dirt = 1;
2474 btrfs_update_inode_block_group(trans, inode);
2475 btrfs_update_inode_block_group(trans, dir);
2476 if (drop_inode)
2477 goto out_unlock;
2478
2479 path = btrfs_alloc_path();
2480 BUG_ON(!path);
2481 key.objectid = inode->i_ino;
2482 key.offset = 0;
2483 key.flags = 0;
2484 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2485 datasize = btrfs_file_extent_calc_inline_size(name_len);
2486 err = btrfs_insert_empty_item(trans, root, path, &key,
2487 datasize);
54aa1f4d
CM		 2488 if (err) {
2489 drop_inode = 1;
2490 goto out_unlock;
2491 }
39279cc3
CM		 2492 ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
2493 path->slots[0], struct btrfs_file_extent_item);
2494 btrfs_set_file_extent_generation(ei, trans->transid);
2495 btrfs_set_file_extent_type(ei,
2496 BTRFS_FILE_EXTENT_INLINE);
2497 ptr = btrfs_file_extent_inline_start(ei);
2498 btrfs_memcpy(root, path->nodes[0]->b_data,
2499 ptr, symname, name_len);
ccd467d6 2500 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3
CM		 2501 btrfs_free_path(path);
2502 inode->i_op = &btrfs_symlink_inode_operations;
2503 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2504 inode->i_size = name_len - 1;
54aa1f4d
CM		 2505 err = btrfs_update_inode(trans, root, inode);
2506 if (err)
2507 drop_inode = 1;
39279cc3
CM		 2508
2509out_unlock:
2510 btrfs_end_transaction(trans, root);
2511 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2512 if (drop_inode) {
2513 inode_dec_link_count(inode);
2514 iput(inode);
2515 }
2516 btrfs_btree_balance_dirty(root);
2517 return err;
2518}
2519
2520static struct inode_operations btrfs_dir_inode_operations = {
2521 .lookup = btrfs_lookup,
2522 .create = btrfs_create,
2523 .unlink = btrfs_unlink,
2524 .link = btrfs_link,
2525 .mkdir = btrfs_mkdir,
2526 .rmdir = btrfs_rmdir,
2527 .rename = btrfs_rename,
2528 .symlink = btrfs_symlink,
2529 .setattr = btrfs_setattr,
618e21d5 2530 .mknod = btrfs_mknod,
39279cc3
CM		 2531};
2532
2533static struct inode_operations btrfs_dir_ro_inode_operations = {
2534 .lookup = btrfs_lookup,
2535};
2536
2537static struct file_operations btrfs_dir_file_operations = {
2538 .llseek = generic_file_llseek,
2539 .read = generic_read_dir,
2540 .readdir = btrfs_readdir,
2541 .ioctl = btrfs_ioctl,
2542#ifdef CONFIG_COMPAT
2543 .compat_ioctl = btrfs_compat_ioctl,
2544#endif
2545};
2546
2547static struct address_space_operations btrfs_aops = {
2548 .readpage = btrfs_readpage,
2549 .writepage = btrfs_writepage,
2550 .sync_page = block_sync_page,
2551 .prepare_write = btrfs_prepare_write,
2552 .commit_write = btrfs_commit_write,
2553 .bmap = btrfs_bmap,
2554};
2555
2556static struct address_space_operations btrfs_symlink_aops = {
2557 .readpage = btrfs_readpage,
2558 .writepage = btrfs_writepage,
2559};
2560
2561static struct inode_operations btrfs_file_inode_operations = {
2562 .truncate = btrfs_truncate,
2563 .getattr = btrfs_getattr,
2564 .setattr = btrfs_setattr,
2565};
2566
618e21d5
JB		 2567static struct inode_operations btrfs_special_inode_operations = {
2568 .getattr = btrfs_getattr,
2569 .setattr = btrfs_setattr,
2570};
2571
39279cc3
CM		 2572static struct inode_operations btrfs_symlink_inode_operations = {
2573 .readlink = generic_readlink,
2574 .follow_link = page_follow_link_light,
2575 .put_link = page_put_link,
2576};
Linux 6.x block layer and io_uring tree(s)