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btrfs_get_extent should treat inline extents as though they hold a whole block
[linux-2.6-block.git] / fs / btrfs / inode.c
CommitLineData
6cbd5570
CM		 1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
39279cc3
CM		 19#include <linux/buffer_head.h>
20#include <linux/fs.h>
21#include <linux/pagemap.h>
22#include <linux/highmem.h>
23#include <linux/time.h>
24#include <linux/init.h>
25#include <linux/string.h>
26#include <linux/smp_lock.h>
27#include <linux/backing-dev.h>
28#include <linux/mpage.h>
29#include <linux/swap.h>
30#include <linux/writeback.h>
31#include <linux/statfs.h>
32#include <linux/compat.h>
9ebefb18 33#include <linux/bit_spinlock.h>
92fee66d 34#include <linux/version.h>
39279cc3
CM		 35#include "ctree.h"
36#include "disk-io.h"
37#include "transaction.h"
38#include "btrfs_inode.h"
39#include "ioctl.h"
40#include "print-tree.h"
41
42struct btrfs_iget_args {
43 u64 ino;
44 struct btrfs_root *root;
45};
46
47static struct inode_operations btrfs_dir_inode_operations;
48static struct inode_operations btrfs_symlink_inode_operations;
49static struct inode_operations btrfs_dir_ro_inode_operations;
618e21d5 50static struct inode_operations btrfs_special_inode_operations;
39279cc3
CM		 51static struct inode_operations btrfs_file_inode_operations;
52static struct address_space_operations btrfs_aops;
53static struct address_space_operations btrfs_symlink_aops;
54static struct file_operations btrfs_dir_file_operations;
07157aac 55static struct extent_map_ops btrfs_extent_map_ops;
39279cc3
CM		 56
57static struct kmem_cache *btrfs_inode_cachep;
58struct kmem_cache *btrfs_trans_handle_cachep;
59struct kmem_cache *btrfs_transaction_cachep;
60struct kmem_cache *btrfs_bit_radix_cachep;
61struct kmem_cache *btrfs_path_cachep;
62
63#define S_SHIFT 12
64static unsigned char btrfs_type_by_mode[S_IFMT >> S_SHIFT] = {
65 [S_IFREG >> S_SHIFT] = BTRFS_FT_REG_FILE,
66 [S_IFDIR >> S_SHIFT] = BTRFS_FT_DIR,
67 [S_IFCHR >> S_SHIFT] = BTRFS_FT_CHRDEV,
68 [S_IFBLK >> S_SHIFT] = BTRFS_FT_BLKDEV,
69 [S_IFIFO >> S_SHIFT] = BTRFS_FT_FIFO,
70 [S_IFSOCK >> S_SHIFT] = BTRFS_FT_SOCK,
71 [S_IFLNK >> S_SHIFT] = BTRFS_FT_SYMLINK,
72};
73
b888db2b
CM		 74static int run_delalloc_range(struct inode *inode, u64 start, u64 end)
75{
76 struct btrfs_root *root = BTRFS_I(inode)->root;
77 struct btrfs_trans_handle *trans;
78 struct btrfs_key ins;
79 u64 alloc_hint = 0;
80 u64 num_blocks;
81 int ret;
82 u64 blocksize = 1 << inode->i_blkbits;
83
84 mutex_lock(&root->fs_info->fs_mutex);
85 trans = btrfs_start_transaction(root, 1);
86 btrfs_set_trans_block_group(trans, inode);
87 BUG_ON(!trans);
88 num_blocks = (end - start + blocksize) & ~(blocksize - 1);
89 ret = btrfs_drop_extents(trans, root, inode,
90 start, start + num_blocks, &alloc_hint);
91 num_blocks = num_blocks >> inode->i_blkbits;
92 ret = btrfs_alloc_extent(trans, root, inode->i_ino, num_blocks, 0,
93 alloc_hint, (u64)-1, &ins, 1);
94 if (ret) {
95 WARN_ON(1);
96 goto out;
97 }
98 ret = btrfs_insert_file_extent(trans, root, inode->i_ino,
99 start, ins.objectid, ins.offset,
100 ins.offset);
101out:
102 btrfs_end_transaction(trans, root);
103 mutex_unlock(&root->fs_info->fs_mutex);
104 return ret;
105}
106
07157aac
CM		 107int btrfs_writepage_io_hook(struct page *page, u64 start, u64 end)
108{
109 struct inode *inode = page->mapping->host;
110 struct btrfs_root *root = BTRFS_I(inode)->root;
111 struct btrfs_trans_handle *trans;
112 char *kaddr;
113 int ret;
114 u64 page_start = page->index << PAGE_CACHE_SHIFT;
115 size_t offset = start - page_start;
116
117 mutex_lock(&root->fs_info->fs_mutex);
118 trans = btrfs_start_transaction(root, 1);
119 btrfs_set_trans_block_group(trans, inode);
120 kaddr = kmap(page);
121 btrfs_csum_file_block(trans, root, inode->i_ino,
122 start, kaddr + offset, end - start + 1);
123 kunmap(page);
124 ret = btrfs_end_transaction(trans, root);
125 BUG_ON(ret);
126 mutex_unlock(&root->fs_info->fs_mutex);
127 return ret;
128}
129
130int btrfs_readpage_io_hook(struct page *page, u64 start, u64 end)
131{
132 int ret = 0;
133 struct inode *inode = page->mapping->host;
134 struct btrfs_root *root = BTRFS_I(inode)->root;
135 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
136 struct btrfs_csum_item *item;
137 struct btrfs_path *path = NULL;
138 u64 private;
139
140 mutex_lock(&root->fs_info->fs_mutex);
141 path = btrfs_alloc_path();
142 item = btrfs_lookup_csum(NULL, root, path, inode->i_ino, start, 0);
143 if (IS_ERR(item)) {
144 ret = PTR_ERR(item);
145 /* a csum that isn't present is a preallocated region. */
146 if (ret == -ENOENT || ret == -EFBIG)
147 ret = 0;
148 private = 0;
149 goto out;
150 }
151 memcpy((char *)&private, &item->csum, BTRFS_CRC32_SIZE);
152 set_state_private(em_tree, start, private);
153out:
154 if (path)
155 btrfs_free_path(path);
156 mutex_unlock(&root->fs_info->fs_mutex);
157 return ret;
158}
159
160int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end)
161{
162 char csum[BTRFS_CRC32_SIZE];
163 size_t offset = start - (page->index << PAGE_CACHE_SHIFT);
164 struct inode *inode = page->mapping->host;
165 struct btrfs_root *root = BTRFS_I(inode)->root;
166 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
167 char *kaddr;
168 u64 private;
169 int ret;
170
171 ret = get_state_private(em_tree, start, &private);
172 kaddr = kmap_atomic(page, KM_IRQ0);
173 if (ret) {
174 goto zeroit;
175 }
176 ret = btrfs_csum_data(root, kaddr + offset, end - start + 1, csum);
177 BUG_ON(ret);
178 if (memcmp(csum, &private, BTRFS_CRC32_SIZE)) {
179 goto zeroit;
180 }
181 kunmap_atomic(kaddr, KM_IRQ0);
182 return 0;
183
184zeroit:
185 printk("btrfs csum failed ino %lu off %llu\n",
186 page->mapping->host->i_ino, (unsigned long long)start);
187 memset(kaddr + offset, 1, end - start + 1); flush_dcache_page(page);
188 kunmap_atomic(kaddr, KM_IRQ0);
189 return 0;
190}
b888db2b 191
39279cc3
CM		 192void btrfs_read_locked_inode(struct inode *inode)
193{
194 struct btrfs_path *path;
195 struct btrfs_inode_item *inode_item;
196 struct btrfs_root *root = BTRFS_I(inode)->root;
197 struct btrfs_key location;
198 u64 alloc_group_block;
618e21d5 199 u32 rdev;
39279cc3
CM		 200 int ret;
201
202 path = btrfs_alloc_path();
203 BUG_ON(!path);
39279cc3
CM		 204 mutex_lock(&root->fs_info->fs_mutex);
205
206 memcpy(&location, &BTRFS_I(inode)->location, sizeof(location));
207 ret = btrfs_lookup_inode(NULL, root, path, &location, 0);
208 if (ret) {
39279cc3
CM		 209 goto make_bad;
210 }
211 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
212 path->slots[0],
213 struct btrfs_inode_item);
214
215 inode->i_mode = btrfs_inode_mode(inode_item);
216 inode->i_nlink = btrfs_inode_nlink(inode_item);
217 inode->i_uid = btrfs_inode_uid(inode_item);
218 inode->i_gid = btrfs_inode_gid(inode_item);
219 inode->i_size = btrfs_inode_size(inode_item);
220 inode->i_atime.tv_sec = btrfs_timespec_sec(&inode_item->atime);
221 inode->i_atime.tv_nsec = btrfs_timespec_nsec(&inode_item->atime);
222 inode->i_mtime.tv_sec = btrfs_timespec_sec(&inode_item->mtime);
223 inode->i_mtime.tv_nsec = btrfs_timespec_nsec(&inode_item->mtime);
224 inode->i_ctime.tv_sec = btrfs_timespec_sec(&inode_item->ctime);
225 inode->i_ctime.tv_nsec = btrfs_timespec_nsec(&inode_item->ctime);
226 inode->i_blocks = btrfs_inode_nblocks(inode_item);
227 inode->i_generation = btrfs_inode_generation(inode_item);
618e21d5
JB		 228 inode->i_rdev = 0;
229 rdev = btrfs_inode_rdev(inode_item);
39279cc3
CM		 230 alloc_group_block = btrfs_inode_block_group(inode_item);
231 BTRFS_I(inode)->block_group = btrfs_lookup_block_group(root->fs_info,
232 alloc_group_block);
233
234 btrfs_free_path(path);
235 inode_item = NULL;
236
237 mutex_unlock(&root->fs_info->fs_mutex);
238
239 switch (inode->i_mode & S_IFMT) {
39279cc3
CM		 240 case S_IFREG:
241 inode->i_mapping->a_ops = &btrfs_aops;
07157aac 242 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 243 inode->i_fop = &btrfs_file_operations;
244 inode->i_op = &btrfs_file_inode_operations;
245 break;
246 case S_IFDIR:
247 inode->i_fop = &btrfs_dir_file_operations;
248 if (root == root->fs_info->tree_root)
249 inode->i_op = &btrfs_dir_ro_inode_operations;
250 else
251 inode->i_op = &btrfs_dir_inode_operations;
252 break;
253 case S_IFLNK:
254 inode->i_op = &btrfs_symlink_inode_operations;
255 inode->i_mapping->a_ops = &btrfs_symlink_aops;
256 break;
618e21d5
JB		 257 default:
258 init_special_inode(inode, inode->i_mode, rdev);
259 break;
39279cc3
CM		 260 }
261 return;
262
263make_bad:
264 btrfs_release_path(root, path);
265 btrfs_free_path(path);
266 mutex_unlock(&root->fs_info->fs_mutex);
267 make_bad_inode(inode);
268}
269
270static void fill_inode_item(struct btrfs_inode_item *item,
271 struct inode *inode)
272{
273 btrfs_set_inode_uid(item, inode->i_uid);
274 btrfs_set_inode_gid(item, inode->i_gid);
275 btrfs_set_inode_size(item, inode->i_size);
276 btrfs_set_inode_mode(item, inode->i_mode);
277 btrfs_set_inode_nlink(item, inode->i_nlink);
278 btrfs_set_timespec_sec(&item->atime, inode->i_atime.tv_sec);
279 btrfs_set_timespec_nsec(&item->atime, inode->i_atime.tv_nsec);
280 btrfs_set_timespec_sec(&item->mtime, inode->i_mtime.tv_sec);
281 btrfs_set_timespec_nsec(&item->mtime, inode->i_mtime.tv_nsec);
282 btrfs_set_timespec_sec(&item->ctime, inode->i_ctime.tv_sec);
283 btrfs_set_timespec_nsec(&item->ctime, inode->i_ctime.tv_nsec);
284 btrfs_set_inode_nblocks(item, inode->i_blocks);
285 btrfs_set_inode_generation(item, inode->i_generation);
618e21d5 286 btrfs_set_inode_rdev(item, inode->i_rdev);
39279cc3
CM		 287 btrfs_set_inode_block_group(item,
288 BTRFS_I(inode)->block_group->key.objectid);
289}
290
a52d9a80 291int btrfs_update_inode(struct btrfs_trans_handle *trans,
39279cc3
CM		 292 struct btrfs_root *root,
293 struct inode *inode)
294{
295 struct btrfs_inode_item *inode_item;
296 struct btrfs_path *path;
297 int ret;
298
299 path = btrfs_alloc_path();
300 BUG_ON(!path);
39279cc3
CM		 301 ret = btrfs_lookup_inode(trans, root, path,
302 &BTRFS_I(inode)->location, 1);
303 if (ret) {
304 if (ret > 0)
305 ret = -ENOENT;
306 goto failed;
307 }
308
309 inode_item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
310 path->slots[0],
311 struct btrfs_inode_item);
312
313 fill_inode_item(inode_item, inode);
314 btrfs_mark_buffer_dirty(path->nodes[0]);
15ee9bc7 315 btrfs_set_inode_last_trans(trans, inode);
39279cc3
CM		 316 ret = 0;
317failed:
318 btrfs_release_path(root, path);
319 btrfs_free_path(path);
320 return ret;
321}
322
323
324static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
325 struct btrfs_root *root,
326 struct inode *dir,
327 struct dentry *dentry)
328{
329 struct btrfs_path *path;
330 const char *name = dentry->d_name.name;
331 int name_len = dentry->d_name.len;
332 int ret = 0;
333 u64 objectid;
334 struct btrfs_dir_item *di;
335
336 path = btrfs_alloc_path();
54aa1f4d
CM		 337 if (!path) {
338 ret = -ENOMEM;
339 goto err;
340 }
341
39279cc3
CM		 342 di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino,
343 name, name_len, -1);
344 if (IS_ERR(di)) {
345 ret = PTR_ERR(di);
346 goto err;
347 }
348 if (!di) {
349 ret = -ENOENT;
350 goto err;
351 }
352 objectid = btrfs_disk_key_objectid(&di->location);
353 ret = btrfs_delete_one_dir_name(trans, root, path, di);
54aa1f4d
CM		 354 if (ret)
355 goto err;
39279cc3
CM		 356 btrfs_release_path(root, path);
357
358 di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino,
359 objectid, name, name_len, -1);
360 if (IS_ERR(di)) {
361 ret = PTR_ERR(di);
362 goto err;
363 }
364 if (!di) {
365 ret = -ENOENT;
366 goto err;
367 }
368 ret = btrfs_delete_one_dir_name(trans, root, path, di);
39279cc3
CM		 369
370 dentry->d_inode->i_ctime = dir->i_ctime;
371err:
372 btrfs_free_path(path);
373 if (!ret) {
374 dir->i_size -= name_len * 2;
79c44584 375 dir->i_mtime = dir->i_ctime = CURRENT_TIME;
39279cc3
CM		 376 btrfs_update_inode(trans, root, dir);
377 drop_nlink(dentry->d_inode);
54aa1f4d 378 ret = btrfs_update_inode(trans, root, dentry->d_inode);
39279cc3
CM		 379 dir->i_sb->s_dirt = 1;
380 }
381 return ret;
382}
383
384static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
385{
386 struct btrfs_root *root;
387 struct btrfs_trans_handle *trans;
388 int ret;
d3c2fdcf 389 unsigned long nr;
39279cc3
CM		 390
391 root = BTRFS_I(dir)->root;
392 mutex_lock(&root->fs_info->fs_mutex);
393 trans = btrfs_start_transaction(root, 1);
394 btrfs_set_trans_block_group(trans, dir);
395 ret = btrfs_unlink_trans(trans, root, dir, dentry);
d3c2fdcf 396 nr = trans->blocks_used;
39279cc3
CM		 397 btrfs_end_transaction(trans, root);
398 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 399 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 400 return ret;
401}
402
403static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
404{
405 struct inode *inode = dentry->d_inode;
406 int err;
407 int ret;
408 struct btrfs_root *root = BTRFS_I(dir)->root;
409 struct btrfs_path *path;
410 struct btrfs_key key;
411 struct btrfs_trans_handle *trans;
412 struct btrfs_key found_key;
413 int found_type;
414 struct btrfs_leaf *leaf;
415 char *goodnames = "..";
d3c2fdcf 416 unsigned long nr;
39279cc3
CM		 417
418 path = btrfs_alloc_path();
419 BUG_ON(!path);
39279cc3
CM		 420 mutex_lock(&root->fs_info->fs_mutex);
421 trans = btrfs_start_transaction(root, 1);
422 btrfs_set_trans_block_group(trans, dir);
423 key.objectid = inode->i_ino;
424 key.offset = (u64)-1;
425 key.flags = (u32)-1;
426 while(1) {
427 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
428 if (ret < 0) {
429 err = ret;
430 goto out;
431 }
432 BUG_ON(ret == 0);
433 if (path->slots[0] == 0) {
434 err = -ENOENT;
435 goto out;
436 }
437 path->slots[0]--;
438 leaf = btrfs_buffer_leaf(path->nodes[0]);
439 btrfs_disk_key_to_cpu(&found_key,
440 &leaf->items[path->slots[0]].key);
441 found_type = btrfs_key_type(&found_key);
442 if (found_key.objectid != inode->i_ino) {
443 err = -ENOENT;
444 goto out;
445 }
446 if ((found_type != BTRFS_DIR_ITEM_KEY &&
447 found_type != BTRFS_DIR_INDEX_KEY) ||
448 (!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
449 !btrfs_match_dir_item_name(root, path, goodnames, 1))) {
450 err = -ENOTEMPTY;
451 goto out;
452 }
453 ret = btrfs_del_item(trans, root, path);
454 BUG_ON(ret);
455
456 if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
457 break;
458 btrfs_release_path(root, path);
459 }
460 ret = 0;
461 btrfs_release_path(root, path);
462
463 /* now the directory is empty */
464 err = btrfs_unlink_trans(trans, root, dir, dentry);
465 if (!err) {
466 inode->i_size = 0;
467 }
468out:
469 btrfs_release_path(root, path);
470 btrfs_free_path(path);
471 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 472 nr = trans->blocks_used;
39279cc3 473 ret = btrfs_end_transaction(trans, root);
d3c2fdcf 474 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 475 if (ret && !err)
476 err = ret;
477 return err;
478}
479
480static int btrfs_free_inode(struct btrfs_trans_handle *trans,
481 struct btrfs_root *root,
482 struct inode *inode)
483{
484 struct btrfs_path *path;
485 int ret;
486
487 clear_inode(inode);
488
489 path = btrfs_alloc_path();
490 BUG_ON(!path);
39279cc3
CM		 491 ret = btrfs_lookup_inode(trans, root, path,
492 &BTRFS_I(inode)->location, -1);
54aa1f4d
CM		 493 if (ret > 0)
494 ret = -ENOENT;
495 if (!ret)
496 ret = btrfs_del_item(trans, root, path);
39279cc3
CM		 497 btrfs_free_path(path);
498 return ret;
499}
500
39279cc3
CM		 501/*
502 * this can truncate away extent items, csum items and directory items.
503 * It starts at a high offset and removes keys until it can't find
504 * any higher than i_size.
505 *
506 * csum items that cross the new i_size are truncated to the new size
507 * as well.
508 */
509static int btrfs_truncate_in_trans(struct btrfs_trans_handle *trans,
510 struct btrfs_root *root,
511 struct inode *inode)
512{
513 int ret;
514 struct btrfs_path *path;
515 struct btrfs_key key;
516 struct btrfs_disk_key *found_key;
517 u32 found_type;
518 struct btrfs_leaf *leaf;
519 struct btrfs_file_extent_item *fi;
520 u64 extent_start = 0;
521 u64 extent_num_blocks = 0;
522 u64 item_end = 0;
523 int found_extent;
524 int del_item;
525
a52d9a80 526 btrfs_drop_extent_cache(inode, inode->i_size, (u64)-1);
39279cc3 527 path = btrfs_alloc_path();
3c69faec 528 path->reada = -1;
39279cc3
CM		 529 BUG_ON(!path);
530 /* FIXME, add redo link to tree so we don't leak on crash */
531 key.objectid = inode->i_ino;
532 key.offset = (u64)-1;
533 key.flags = (u32)-1;
534 while(1) {
535 btrfs_init_path(path);
536 fi = NULL;
537 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
538 if (ret < 0) {
539 goto error;
540 }
541 if (ret > 0) {
542 BUG_ON(path->slots[0] == 0);
543 path->slots[0]--;
544 }
39279cc3
CM		 545 leaf = btrfs_buffer_leaf(path->nodes[0]);
546 found_key = &leaf->items[path->slots[0]].key;
547 found_type = btrfs_disk_key_type(found_key);
548
549 if (btrfs_disk_key_objectid(found_key) != inode->i_ino)
550 break;
551 if (found_type != BTRFS_CSUM_ITEM_KEY &&
552 found_type != BTRFS_DIR_ITEM_KEY &&
553 found_type != BTRFS_DIR_INDEX_KEY &&
554 found_type != BTRFS_EXTENT_DATA_KEY)
555 break;
556
557 item_end = btrfs_disk_key_offset(found_key);
558 if (found_type == BTRFS_EXTENT_DATA_KEY) {
559 fi = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
560 path->slots[0],
561 struct btrfs_file_extent_item);
562 if (btrfs_file_extent_type(fi) !=
563 BTRFS_FILE_EXTENT_INLINE) {
564 item_end += btrfs_file_extent_num_blocks(fi) <<
565 inode->i_blkbits;
566 }
567 }
568 if (found_type == BTRFS_CSUM_ITEM_KEY) {
569 ret = btrfs_csum_truncate(trans, root, path,
570 inode->i_size);
571 BUG_ON(ret);
572 }
573 if (item_end < inode->i_size) {
b888db2b
CM		 574 if (found_type == BTRFS_DIR_ITEM_KEY) {
575 found_type = BTRFS_INODE_ITEM_KEY;
576 } else if (found_type == BTRFS_EXTENT_ITEM_KEY) {
577 found_type = BTRFS_CSUM_ITEM_KEY;
578 } else if (found_type) {
579 found_type--;
580 } else {
581 break;
39279cc3 582 }
a61721d5 583 btrfs_set_key_type(&key, found_type);
b888db2b 584 continue;
39279cc3
CM		 585 }
586 if (btrfs_disk_key_offset(found_key) >= inode->i_size)
587 del_item = 1;
588 else
589 del_item = 0;
590 found_extent = 0;
591
592 /* FIXME, shrink the extent if the ref count is only 1 */
593 if (found_type == BTRFS_EXTENT_DATA_KEY &&
594 btrfs_file_extent_type(fi) !=
595 BTRFS_FILE_EXTENT_INLINE) {
596 u64 num_dec;
bab9fb03 597 extent_start = btrfs_file_extent_disk_blocknr(fi);
39279cc3
CM		 598 if (!del_item) {
599 u64 orig_num_blocks =
600 btrfs_file_extent_num_blocks(fi);
601 extent_num_blocks = inode->i_size -
602 btrfs_disk_key_offset(found_key) +
603 root->blocksize - 1;
604 extent_num_blocks >>= inode->i_blkbits;
605 btrfs_set_file_extent_num_blocks(fi,
606 extent_num_blocks);
bab9fb03
Y		 607 num_dec = (orig_num_blocks -
608 extent_num_blocks) << 3;
609 if (extent_start != 0) {
610 inode->i_blocks -= num_dec;
611 }
ccd467d6 612 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3 613 } else {
39279cc3
CM		 614 extent_num_blocks =
615 btrfs_file_extent_disk_num_blocks(fi);
616 /* FIXME blocksize != 4096 */
617 num_dec = btrfs_file_extent_num_blocks(fi) << 3;
618 if (extent_start != 0) {
619 found_extent = 1;
620 inode->i_blocks -= num_dec;
621 }
622 }
623 }
624 if (del_item) {
625 ret = btrfs_del_item(trans, root, path);
54aa1f4d
CM		 626 if (ret)
627 goto error;
39279cc3
CM		 628 } else {
629 break;
630 }
631 btrfs_release_path(root, path);
632 if (found_extent) {
633 ret = btrfs_free_extent(trans, root, extent_start,
634 extent_num_blocks, 0);
635 BUG_ON(ret);
636 }
637 }
638 ret = 0;
639error:
640 btrfs_release_path(root, path);
641 btrfs_free_path(path);
642 inode->i_sb->s_dirt = 1;
643 return ret;
644}
645
b888db2b 646static int btrfs_cow_one_page(struct inode *inode, struct page *page,
a52d9a80
CM		 647 size_t zero_start)
648{
649 char *kaddr;
650 int ret = 0;
b888db2b 651 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
a52d9a80 652 u64 page_start = page->index << PAGE_CACHE_SHIFT;
b888db2b 653 u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
a52d9a80 654
b3cfa35a 655 set_page_extent_mapped(page);
a52d9a80 656
b888db2b
CM		 657 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
658 set_extent_delalloc(&BTRFS_I(inode)->extent_tree, page_start,
659 page_end, GFP_NOFS);
a52d9a80 660 if (zero_start != PAGE_CACHE_SIZE) {
b888db2b 661 kaddr = kmap(page);
a52d9a80
CM		 662 memset(kaddr + zero_start, 0, PAGE_CACHE_SIZE - zero_start);
663 flush_dcache_page(page);
b888db2b 664 kunmap(page);
a52d9a80 665 }
b888db2b
CM		 666 set_page_dirty(page);
667 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
a52d9a80 668
a52d9a80
CM		 669 return ret;
670}
671
39279cc3
CM		 672/*
673 * taken from block_truncate_page, but does cow as it zeros out
674 * any bytes left in the last page in the file.
675 */
676static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
677{
678 struct inode *inode = mapping->host;
679 unsigned blocksize = 1 << inode->i_blkbits;
680 pgoff_t index = from >> PAGE_CACHE_SHIFT;
681 unsigned offset = from & (PAGE_CACHE_SIZE-1);
682 struct page *page;
39279cc3 683 int ret = 0;
a52d9a80 684 u64 page_start;
39279cc3
CM		 685
686 if ((offset & (blocksize - 1)) == 0)
687 goto out;
688
011410bd 689 down_read(&BTRFS_I(inode)->root->snap_sem);
39279cc3
CM		 690 ret = -ENOMEM;
691 page = grab_cache_page(mapping, index);
692 if (!page)
693 goto out;
39279cc3 694 if (!PageUptodate(page)) {
9ebefb18 695 ret = btrfs_readpage(NULL, page);
39279cc3
CM		 696 lock_page(page);
697 if (!PageUptodate(page)) {
698 ret = -EIO;
699 goto out;
700 }
701 }
a52d9a80
CM		 702 page_start = page->index << PAGE_CACHE_SHIFT;
703
b888db2b 704 ret = btrfs_cow_one_page(inode, page, offset);
39279cc3 705
39279cc3
CM		 706 unlock_page(page);
707 page_cache_release(page);
011410bd 708 up_read(&BTRFS_I(inode)->root->snap_sem);
39279cc3
CM		 709out:
710 return ret;
711}
712
713static int btrfs_setattr(struct dentry *dentry, struct iattr *attr)
714{
715 struct inode *inode = dentry->d_inode;
716 int err;
717
718 err = inode_change_ok(inode, attr);
719 if (err)
720 return err;
721
722 if (S_ISREG(inode->i_mode) &&
723 attr->ia_valid & ATTR_SIZE && attr->ia_size > inode->i_size) {
724 struct btrfs_trans_handle *trans;
725 struct btrfs_root *root = BTRFS_I(inode)->root;
2bf5a725
CM		 726 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
727
39279cc3
CM		 728 u64 mask = root->blocksize - 1;
729 u64 pos = (inode->i_size + mask) & ~mask;
2bf5a725 730 u64 block_end = attr->ia_size | mask;
39279cc3 731 u64 hole_size;
2bf5a725 732 u64 alloc_hint;
39279cc3
CM		 733
734 if (attr->ia_size <= pos)
735 goto out;
736
737 btrfs_truncate_page(inode->i_mapping, inode->i_size);
738
2bf5a725 739 lock_extent(em_tree, pos, block_end, GFP_NOFS);
39279cc3 740 hole_size = (attr->ia_size - pos + mask) & ~mask;
39279cc3
CM		 741
742 mutex_lock(&root->fs_info->fs_mutex);
743 trans = btrfs_start_transaction(root, 1);
744 btrfs_set_trans_block_group(trans, inode);
2bf5a725
CM		 745 err = btrfs_drop_extents(trans, root, inode,
746 pos, pos + hole_size, &alloc_hint);
747
748 hole_size >>= inode->i_blkbits;
749
39279cc3
CM		 750 err = btrfs_insert_file_extent(trans, root, inode->i_ino,
751 pos, 0, 0, hole_size);
39279cc3
CM		 752 btrfs_end_transaction(trans, root);
753 mutex_unlock(&root->fs_info->fs_mutex);
2bf5a725 754 unlock_extent(em_tree, pos, block_end, GFP_NOFS);
54aa1f4d
CM		 755 if (err)
756 return err;
39279cc3
CM		 757 }
758out:
759 err = inode_setattr(inode, attr);
760
761 return err;
762}
763void btrfs_delete_inode(struct inode *inode)
764{
765 struct btrfs_trans_handle *trans;
766 struct btrfs_root *root = BTRFS_I(inode)->root;
d3c2fdcf 767 unsigned long nr;
39279cc3
CM		 768 int ret;
769
770 truncate_inode_pages(&inode->i_data, 0);
771 if (is_bad_inode(inode)) {
772 goto no_delete;
773 }
774 inode->i_size = 0;
775 mutex_lock(&root->fs_info->fs_mutex);
776 trans = btrfs_start_transaction(root, 1);
777 btrfs_set_trans_block_group(trans, inode);
778 ret = btrfs_truncate_in_trans(trans, root, inode);
54aa1f4d
CM		 779 if (ret)
780 goto no_delete_lock;
781 ret = btrfs_free_inode(trans, root, inode);
782 if (ret)
783 goto no_delete_lock;
d3c2fdcf 784 nr = trans->blocks_used;
39279cc3
CM		 785 btrfs_end_transaction(trans, root);
786 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 787 btrfs_btree_balance_dirty(root, nr);
39279cc3 788 return;
54aa1f4d
CM		 789
790no_delete_lock:
d3c2fdcf 791 nr = trans->blocks_used;
54aa1f4d
CM		 792 btrfs_end_transaction(trans, root);
793 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 794 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 795no_delete:
796 clear_inode(inode);
797}
798
799/*
800 * this returns the key found in the dir entry in the location pointer.
801 * If no dir entries were found, location->objectid is 0.
802 */
803static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
804 struct btrfs_key *location)
805{
806 const char *name = dentry->d_name.name;
807 int namelen = dentry->d_name.len;
808 struct btrfs_dir_item *di;
809 struct btrfs_path *path;
810 struct btrfs_root *root = BTRFS_I(dir)->root;
811 int ret;
812
813 path = btrfs_alloc_path();
814 BUG_ON(!path);
39279cc3
CM		 815 di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
816 namelen, 0);
817 if (!di || IS_ERR(di)) {
818 location->objectid = 0;
819 ret = 0;
820 goto out;
821 }
822 btrfs_disk_key_to_cpu(location, &di->location);
823out:
824 btrfs_release_path(root, path);
825 btrfs_free_path(path);
826 return ret;
827}
828
829/*
830 * when we hit a tree root in a directory, the btrfs part of the inode
831 * needs to be changed to reflect the root directory of the tree root. This
832 * is kind of like crossing a mount point.
833 */
834static int fixup_tree_root_location(struct btrfs_root *root,
835 struct btrfs_key *location,
58176a96
JB		 836 struct btrfs_root **sub_root,
837 struct dentry *dentry)
39279cc3
CM		 838{
839 struct btrfs_path *path;
840 struct btrfs_root_item *ri;
841
842 if (btrfs_key_type(location) != BTRFS_ROOT_ITEM_KEY)
843 return 0;
844 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
845 return 0;
846
847 path = btrfs_alloc_path();
848 BUG_ON(!path);
849 mutex_lock(&root->fs_info->fs_mutex);
850
58176a96
JB		 851 *sub_root = btrfs_read_fs_root(root->fs_info, location,
852 dentry->d_name.name,
853 dentry->d_name.len);
39279cc3
CM		 854 if (IS_ERR(*sub_root))
855 return PTR_ERR(*sub_root);
856
857 ri = &(*sub_root)->root_item;
858 location->objectid = btrfs_root_dirid(ri);
859 location->flags = 0;
860 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
861 location->offset = 0;
862
863 btrfs_free_path(path);
864 mutex_unlock(&root->fs_info->fs_mutex);
865 return 0;
866}
867
868static int btrfs_init_locked_inode(struct inode *inode, void *p)
869{
870 struct btrfs_iget_args *args = p;
871 inode->i_ino = args->ino;
872 BTRFS_I(inode)->root = args->root;
b888db2b
CM		 873 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
874 inode->i_mapping, GFP_NOFS);
39279cc3
CM		 875 return 0;
876}
877
878static int btrfs_find_actor(struct inode *inode, void *opaque)
879{
880 struct btrfs_iget_args *args = opaque;
881 return (args->ino == inode->i_ino &&
882 args->root == BTRFS_I(inode)->root);
883}
884
885struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
886 struct btrfs_root *root)
887{
888 struct inode *inode;
889 struct btrfs_iget_args args;
890 args.ino = objectid;
891 args.root = root;
892
893 inode = iget5_locked(s, objectid, btrfs_find_actor,
894 btrfs_init_locked_inode,
895 (void *)&args);
896 return inode;
897}
898
899static struct dentry *btrfs_lookup(struct inode *dir, struct dentry *dentry,
900 struct nameidata *nd)
901{
902 struct inode * inode;
903 struct btrfs_inode *bi = BTRFS_I(dir);
904 struct btrfs_root *root = bi->root;
905 struct btrfs_root *sub_root = root;
906 struct btrfs_key location;
907 int ret;
908
909 if (dentry->d_name.len > BTRFS_NAME_LEN)
910 return ERR_PTR(-ENAMETOOLONG);
911 mutex_lock(&root->fs_info->fs_mutex);
912 ret = btrfs_inode_by_name(dir, dentry, &location);
913 mutex_unlock(&root->fs_info->fs_mutex);
914 if (ret < 0)
915 return ERR_PTR(ret);
916 inode = NULL;
917 if (location.objectid) {
58176a96
JB		 918 ret = fixup_tree_root_location(root, &location, &sub_root,
919 dentry);
39279cc3
CM		 920 if (ret < 0)
921 return ERR_PTR(ret);
922 if (ret > 0)
923 return ERR_PTR(-ENOENT);
924 inode = btrfs_iget_locked(dir->i_sb, location.objectid,
925 sub_root);
926 if (!inode)
927 return ERR_PTR(-EACCES);
928 if (inode->i_state & I_NEW) {
929 /* the inode and parent dir are two different roots */
930 if (sub_root != root) {
931 igrab(inode);
932 sub_root->inode = inode;
933 }
934 BTRFS_I(inode)->root = sub_root;
935 memcpy(&BTRFS_I(inode)->location, &location,
936 sizeof(location));
937 btrfs_read_locked_inode(inode);
938 unlock_new_inode(inode);
939 }
940 }
941 return d_splice_alias(inode, dentry);
942}
943
39279cc3
CM		 944static unsigned char btrfs_filetype_table[] = {
945 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
946};
947
948static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
949{
950 struct inode *inode = filp->f_path.dentry->d_inode;
951 struct btrfs_root *root = BTRFS_I(inode)->root;
952 struct btrfs_item *item;
953 struct btrfs_dir_item *di;
954 struct btrfs_key key;
955 struct btrfs_path *path;
956 int ret;
957 u32 nritems;
958 struct btrfs_leaf *leaf;
959 int slot;
960 int advance;
961 unsigned char d_type;
962 int over = 0;
963 u32 di_cur;
964 u32 di_total;
965 u32 di_len;
966 int key_type = BTRFS_DIR_INDEX_KEY;
967
968 /* FIXME, use a real flag for deciding about the key type */
969 if (root->fs_info->tree_root == root)
970 key_type = BTRFS_DIR_ITEM_KEY;
971 mutex_lock(&root->fs_info->fs_mutex);
972 key.objectid = inode->i_ino;
973 key.flags = 0;
974 btrfs_set_key_type(&key, key_type);
975 key.offset = filp->f_pos;
976 path = btrfs_alloc_path();
2cc58cf2 977 path->reada = 2;
39279cc3
CM		 978 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
979 if (ret < 0)
980 goto err;
981 advance = 0;
39279cc3
CM		 982 while(1) {
983 leaf = btrfs_buffer_leaf(path->nodes[0]);
984 nritems = btrfs_header_nritems(&leaf->header);
985 slot = path->slots[0];
986 if (advance || slot >= nritems) {
987 if (slot >= nritems -1) {
39279cc3
CM		 988 ret = btrfs_next_leaf(root, path);
989 if (ret)
990 break;
991 leaf = btrfs_buffer_leaf(path->nodes[0]);
992 nritems = btrfs_header_nritems(&leaf->header);
993 slot = path->slots[0];
994 } else {
995 slot++;
996 path->slots[0]++;
997 }
998 }
999 advance = 1;
1000 item = leaf->items + slot;
1001 if (btrfs_disk_key_objectid(&item->key) != key.objectid)
1002 break;
1003 if (btrfs_disk_key_type(&item->key) != key_type)
1004 break;
1005 if (btrfs_disk_key_offset(&item->key) < filp->f_pos)
1006 continue;
1007 filp->f_pos = btrfs_disk_key_offset(&item->key);
1008 advance = 1;
1009 di = btrfs_item_ptr(leaf, slot, struct btrfs_dir_item);
1010 di_cur = 0;
1011 di_total = btrfs_item_size(leaf->items + slot);
1012 while(di_cur < di_total) {
1013 d_type = btrfs_filetype_table[btrfs_dir_type(di)];
1014 over = filldir(dirent, (const char *)(di + 1),
1015 btrfs_dir_name_len(di),
1016 btrfs_disk_key_offset(&item->key),
1017 btrfs_disk_key_objectid(&di->location),
1018 d_type);
1019 if (over)
1020 goto nopos;
1021 di_len = btrfs_dir_name_len(di) + sizeof(*di);
1022 di_cur += di_len;
1023 di = (struct btrfs_dir_item *)((char *)di + di_len);
1024 }
1025 }
1026 filp->f_pos++;
1027nopos:
1028 ret = 0;
1029err:
1030 btrfs_release_path(root, path);
1031 btrfs_free_path(path);
1032 mutex_unlock(&root->fs_info->fs_mutex);
1033 return ret;
1034}
1035
1036int btrfs_write_inode(struct inode *inode, int wait)
1037{
1038 struct btrfs_root *root = BTRFS_I(inode)->root;
1039 struct btrfs_trans_handle *trans;
1040 int ret = 0;
1041
1042 if (wait) {
1043 mutex_lock(&root->fs_info->fs_mutex);
1044 trans = btrfs_start_transaction(root, 1);
1045 btrfs_set_trans_block_group(trans, inode);
1046 ret = btrfs_commit_transaction(trans, root);
1047 mutex_unlock(&root->fs_info->fs_mutex);
1048 }
1049 return ret;
1050}
1051
1052/*
54aa1f4d 1053 * This is somewhat expensive, updating the tree every time the
39279cc3
CM		 1054 * inode changes. But, it is most likely to find the inode in cache.
1055 * FIXME, needs more benchmarking...there are no reasons other than performance
1056 * to keep or drop this code.
1057 */
1058void btrfs_dirty_inode(struct inode *inode)
1059{
1060 struct btrfs_root *root = BTRFS_I(inode)->root;
1061 struct btrfs_trans_handle *trans;
1062
1063 mutex_lock(&root->fs_info->fs_mutex);
1064 trans = btrfs_start_transaction(root, 1);
1065 btrfs_set_trans_block_group(trans, inode);
1066 btrfs_update_inode(trans, root, inode);
1067 btrfs_end_transaction(trans, root);
1068 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 1069}
1070
1071static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
1072 struct btrfs_root *root,
1073 u64 objectid,
1074 struct btrfs_block_group_cache *group,
1075 int mode)
1076{
1077 struct inode *inode;
1078 struct btrfs_inode_item inode_item;
1079 struct btrfs_key *location;
1080 int ret;
1081 int owner;
1082
1083 inode = new_inode(root->fs_info->sb);
1084 if (!inode)
1085 return ERR_PTR(-ENOMEM);
1086
b888db2b
CM		 1087 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1088 inode->i_mapping, GFP_NOFS);
39279cc3 1089 BTRFS_I(inode)->root = root;
b888db2b 1090
39279cc3
CM		 1091 if (mode & S_IFDIR)
1092 owner = 0;
1093 else
1094 owner = 1;
1095 group = btrfs_find_block_group(root, group, 0, 0, owner);
1096 BTRFS_I(inode)->block_group = group;
1097
1098 inode->i_uid = current->fsuid;
1099 inode->i_gid = current->fsgid;
1100 inode->i_mode = mode;
1101 inode->i_ino = objectid;
1102 inode->i_blocks = 0;
1103 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
1104 fill_inode_item(&inode_item, inode);
1105 location = &BTRFS_I(inode)->location;
1106 location->objectid = objectid;
1107 location->flags = 0;
1108 location->offset = 0;
1109 btrfs_set_key_type(location, BTRFS_INODE_ITEM_KEY);
1110
1111 ret = btrfs_insert_inode(trans, root, objectid, &inode_item);
54aa1f4d
CM		 1112 if (ret)
1113 return ERR_PTR(ret);
39279cc3
CM		 1114 insert_inode_hash(inode);
1115 return inode;
1116}
1117
1118static inline u8 btrfs_inode_type(struct inode *inode)
1119{
1120 return btrfs_type_by_mode[(inode->i_mode & S_IFMT) >> S_SHIFT];
1121}
1122
1123static int btrfs_add_link(struct btrfs_trans_handle *trans,
1124 struct dentry *dentry, struct inode *inode)
1125{
1126 int ret;
1127 struct btrfs_key key;
1128 struct btrfs_root *root = BTRFS_I(dentry->d_parent->d_inode)->root;
79c44584 1129 struct inode *parent_inode;
39279cc3
CM		 1130 key.objectid = inode->i_ino;
1131 key.flags = 0;
1132 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1133 key.offset = 0;
1134
1135 ret = btrfs_insert_dir_item(trans, root,
1136 dentry->d_name.name, dentry->d_name.len,
1137 dentry->d_parent->d_inode->i_ino,
1138 &key, btrfs_inode_type(inode));
1139 if (ret == 0) {
79c44584
CM		 1140 parent_inode = dentry->d_parent->d_inode;
1141 parent_inode->i_size += dentry->d_name.len * 2;
1142 parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
39279cc3
CM		 1143 ret = btrfs_update_inode(trans, root,
1144 dentry->d_parent->d_inode);
1145 }
1146 return ret;
1147}
1148
1149static int btrfs_add_nondir(struct btrfs_trans_handle *trans,
1150 struct dentry *dentry, struct inode *inode)
1151{
1152 int err = btrfs_add_link(trans, dentry, inode);
1153 if (!err) {
1154 d_instantiate(dentry, inode);
1155 return 0;
1156 }
1157 if (err > 0)
1158 err = -EEXIST;
1159 return err;
1160}
1161
618e21d5
JB		 1162static int btrfs_mknod(struct inode *dir, struct dentry *dentry,
1163 int mode, dev_t rdev)
1164{
1165 struct btrfs_trans_handle *trans;
1166 struct btrfs_root *root = BTRFS_I(dir)->root;
1167 struct inode *inode;
1168 int err;
1169 int drop_inode = 0;
1170 u64 objectid;
d3c2fdcf 1171 unsigned long nr;
618e21d5
JB		 1172
1173 if (!new_valid_dev(rdev))
1174 return -EINVAL;
1175
1176 mutex_lock(&root->fs_info->fs_mutex);
1177 trans = btrfs_start_transaction(root, 1);
1178 btrfs_set_trans_block_group(trans, dir);
1179
1180 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1181 if (err) {
1182 err = -ENOSPC;
1183 goto out_unlock;
1184 }
1185
1186 inode = btrfs_new_inode(trans, root, objectid,
1187 BTRFS_I(dir)->block_group, mode);
1188 err = PTR_ERR(inode);
1189 if (IS_ERR(inode))
1190 goto out_unlock;
1191
1192 btrfs_set_trans_block_group(trans, inode);
1193 err = btrfs_add_nondir(trans, dentry, inode);
1194 if (err)
1195 drop_inode = 1;
1196 else {
1197 inode->i_op = &btrfs_special_inode_operations;
1198 init_special_inode(inode, inode->i_mode, rdev);
1b4ab1bb 1199 btrfs_update_inode(trans, root, inode);
618e21d5
JB		 1200 }
1201 dir->i_sb->s_dirt = 1;
1202 btrfs_update_inode_block_group(trans, inode);
1203 btrfs_update_inode_block_group(trans, dir);
1204out_unlock:
d3c2fdcf 1205 nr = trans->blocks_used;
618e21d5
JB		 1206 btrfs_end_transaction(trans, root);
1207 mutex_unlock(&root->fs_info->fs_mutex);
1208
1209 if (drop_inode) {
1210 inode_dec_link_count(inode);
1211 iput(inode);
1212 }
d3c2fdcf 1213 btrfs_btree_balance_dirty(root, nr);
618e21d5
JB		 1214 return err;
1215}
1216
39279cc3
CM		 1217static int btrfs_create(struct inode *dir, struct dentry *dentry,
1218 int mode, struct nameidata *nd)
1219{
1220 struct btrfs_trans_handle *trans;
1221 struct btrfs_root *root = BTRFS_I(dir)->root;
1222 struct inode *inode;
1223 int err;
1224 int drop_inode = 0;
d3c2fdcf 1225 unsigned long nr;
39279cc3
CM		 1226 u64 objectid;
1227
1228 mutex_lock(&root->fs_info->fs_mutex);
1229 trans = btrfs_start_transaction(root, 1);
1230 btrfs_set_trans_block_group(trans, dir);
1231
1232 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1233 if (err) {
1234 err = -ENOSPC;
1235 goto out_unlock;
1236 }
1237
1238 inode = btrfs_new_inode(trans, root, objectid,
1239 BTRFS_I(dir)->block_group, mode);
1240 err = PTR_ERR(inode);
1241 if (IS_ERR(inode))
1242 goto out_unlock;
1243
1244 btrfs_set_trans_block_group(trans, inode);
1245 err = btrfs_add_nondir(trans, dentry, inode);
1246 if (err)
1247 drop_inode = 1;
1248 else {
1249 inode->i_mapping->a_ops = &btrfs_aops;
1250 inode->i_fop = &btrfs_file_operations;
1251 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 1252 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
1253 inode->i_mapping, GFP_NOFS);
07157aac 1254 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 1255 }
1256 dir->i_sb->s_dirt = 1;
1257 btrfs_update_inode_block_group(trans, inode);
1258 btrfs_update_inode_block_group(trans, dir);
1259out_unlock:
d3c2fdcf 1260 nr = trans->blocks_used;
39279cc3
CM		 1261 btrfs_end_transaction(trans, root);
1262 mutex_unlock(&root->fs_info->fs_mutex);
1263
1264 if (drop_inode) {
1265 inode_dec_link_count(inode);
1266 iput(inode);
1267 }
d3c2fdcf 1268 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1269 return err;
1270}
1271
1272static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
1273 struct dentry *dentry)
1274{
1275 struct btrfs_trans_handle *trans;
1276 struct btrfs_root *root = BTRFS_I(dir)->root;
1277 struct inode *inode = old_dentry->d_inode;
d3c2fdcf 1278 unsigned long nr;
39279cc3
CM		 1279 int err;
1280 int drop_inode = 0;
1281
1282 if (inode->i_nlink == 0)
1283 return -ENOENT;
1284
1285 inc_nlink(inode);
1286 mutex_lock(&root->fs_info->fs_mutex);
1287 trans = btrfs_start_transaction(root, 1);
1288 btrfs_set_trans_block_group(trans, dir);
1289 atomic_inc(&inode->i_count);
1290 err = btrfs_add_nondir(trans, dentry, inode);
1291 if (err)
1292 drop_inode = 1;
1293 dir->i_sb->s_dirt = 1;
1294 btrfs_update_inode_block_group(trans, dir);
54aa1f4d
CM		 1295 err = btrfs_update_inode(trans, root, inode);
1296 if (err)
1297 drop_inode = 1;
39279cc3 1298
d3c2fdcf 1299 nr = trans->blocks_used;
39279cc3
CM		 1300 btrfs_end_transaction(trans, root);
1301 mutex_unlock(&root->fs_info->fs_mutex);
1302
1303 if (drop_inode) {
1304 inode_dec_link_count(inode);
1305 iput(inode);
1306 }
d3c2fdcf 1307 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1308 return err;
1309}
1310
1311static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
1312 struct btrfs_root *root,
1313 u64 objectid, u64 dirid)
1314{
1315 int ret;
1316 char buf[2];
1317 struct btrfs_key key;
1318
1319 buf[0] = '.';
1320 buf[1] = '.';
1321
1322 key.objectid = objectid;
1323 key.offset = 0;
1324 key.flags = 0;
1325 btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
1326
1327 ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
1328 &key, BTRFS_FT_DIR);
1329 if (ret)
1330 goto error;
1331 key.objectid = dirid;
1332 ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
1333 &key, BTRFS_FT_DIR);
1334 if (ret)
1335 goto error;
1336error:
1337 return ret;
1338}
1339
1340static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
1341{
1342 struct inode *inode;
1343 struct btrfs_trans_handle *trans;
1344 struct btrfs_root *root = BTRFS_I(dir)->root;
1345 int err = 0;
1346 int drop_on_err = 0;
1347 u64 objectid;
d3c2fdcf 1348 unsigned long nr = 1;
39279cc3
CM		 1349
1350 mutex_lock(&root->fs_info->fs_mutex);
1351 trans = btrfs_start_transaction(root, 1);
1352 btrfs_set_trans_block_group(trans, dir);
1353 if (IS_ERR(trans)) {
1354 err = PTR_ERR(trans);
1355 goto out_unlock;
1356 }
1357
1358 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
1359 if (err) {
1360 err = -ENOSPC;
1361 goto out_unlock;
1362 }
1363
1364 inode = btrfs_new_inode(trans, root, objectid,
1365 BTRFS_I(dir)->block_group, S_IFDIR | mode);
1366 if (IS_ERR(inode)) {
1367 err = PTR_ERR(inode);
1368 goto out_fail;
1369 }
1370 drop_on_err = 1;
1371 inode->i_op = &btrfs_dir_inode_operations;
1372 inode->i_fop = &btrfs_dir_file_operations;
1373 btrfs_set_trans_block_group(trans, inode);
1374
1375 err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
1376 if (err)
1377 goto out_fail;
1378
1379 inode->i_size = 6;
1380 err = btrfs_update_inode(trans, root, inode);
1381 if (err)
1382 goto out_fail;
1383 err = btrfs_add_link(trans, dentry, inode);
1384 if (err)
1385 goto out_fail;
1386 d_instantiate(dentry, inode);
1387 drop_on_err = 0;
1388 dir->i_sb->s_dirt = 1;
1389 btrfs_update_inode_block_group(trans, inode);
1390 btrfs_update_inode_block_group(trans, dir);
1391
1392out_fail:
d3c2fdcf 1393 nr = trans->blocks_used;
39279cc3
CM		 1394 btrfs_end_transaction(trans, root);
1395out_unlock:
1396 mutex_unlock(&root->fs_info->fs_mutex);
1397 if (drop_on_err)
1398 iput(inode);
d3c2fdcf 1399 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1400 return err;
1401}
1402
a52d9a80
CM		 1403struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1404 size_t page_offset, u64 start, u64 end,
1405 int create)
1406{
1407 int ret;
1408 int err = 0;
1409 u64 blocknr;
1410 u64 extent_start = 0;
1411 u64 extent_end = 0;
1412 u64 objectid = inode->i_ino;
1413 u32 found_type;
1414 int failed_insert = 0;
1415 struct btrfs_path *path;
1416 struct btrfs_root *root = BTRFS_I(inode)->root;
1417 struct btrfs_file_extent_item *item;
1418 struct btrfs_leaf *leaf;
1419 struct btrfs_disk_key *found_key;
1420 struct extent_map *em = NULL;
1421 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1422 struct btrfs_trans_handle *trans = NULL;
1423
1424 path = btrfs_alloc_path();
1425 BUG_ON(!path);
1426 mutex_lock(&root->fs_info->fs_mutex);
1427
1428again:
1429 em = lookup_extent_mapping(em_tree, start, end);
1430 if (em) {
1431 goto out;
1432 }
1433 if (!em) {
1434 em = alloc_extent_map(GFP_NOFS);
1435 if (!em) {
1436 err = -ENOMEM;
1437 goto out;
1438 }
1439 em->start = 0;
1440 em->end = 0;
1441 }
1442 em->bdev = inode->i_sb->s_bdev;
1443 ret = btrfs_lookup_file_extent(NULL, root, path,
1444 objectid, start, 0);
1445 if (ret < 0) {
1446 err = ret;
1447 goto out;
1448 }
1449
1450 if (ret != 0) {
1451 if (path->slots[0] == 0)
1452 goto not_found;
1453 path->slots[0]--;
1454 }
1455
1456 item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0],
1457 struct btrfs_file_extent_item);
1458 leaf = btrfs_buffer_leaf(path->nodes[0]);
1459 blocknr = btrfs_file_extent_disk_blocknr(item);
1460 blocknr += btrfs_file_extent_offset(item);
1461
1462 /* are we inside the extent that was found? */
1463 found_key = &leaf->items[path->slots[0]].key;
1464 found_type = btrfs_disk_key_type(found_key);
1465 if (btrfs_disk_key_objectid(found_key) != objectid ||
1466 found_type != BTRFS_EXTENT_DATA_KEY) {
1467 goto not_found;
1468 }
1469
1470 found_type = btrfs_file_extent_type(item);
1471 extent_start = btrfs_disk_key_offset(&leaf->items[path->slots[0]].key);
1472 if (found_type == BTRFS_FILE_EXTENT_REG) {
1473 extent_end = extent_start +
1474 (btrfs_file_extent_num_blocks(item) << inode->i_blkbits);
1475 err = 0;
b888db2b 1476 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1477 em->start = start;
1478 if (start < extent_start) {
b888db2b
CM		 1479 if (end < extent_start)
1480 goto not_found;
a52d9a80
CM		 1481 em->end = extent_end - 1;
1482 } else {
1483 em->end = end;
1484 }
1485 goto not_found_em;
1486 }
1487 if (btrfs_file_extent_disk_blocknr(item) == 0) {
1488 em->start = extent_start;
1489 em->end = extent_end - 1;
1490 em->block_start = 0;
1491 em->block_end = 0;
1492 goto insert;
1493 }
1494 em->block_start = blocknr << inode->i_blkbits;
1495 em->block_end = em->block_start +
1496 (btrfs_file_extent_num_blocks(item) <<
1497 inode->i_blkbits) - 1;
1498 em->start = extent_start;
1499 em->end = extent_end - 1;
1500 goto insert;
1501 } else if (found_type == BTRFS_FILE_EXTENT_INLINE) {
1502 char *ptr;
1503 char *map;
1504 u32 size;
1505
1506 size = btrfs_file_extent_inline_len(leaf->items +
1507 path->slots[0]);
50b78c24 1508 extent_end = extent_start | ((u64)root->blocksize - 1);
b888db2b 1509 if (start < extent_start || start >= extent_end) {
a52d9a80
CM		 1510 em->start = start;
1511 if (start < extent_start) {
b888db2b
CM		 1512 if (end < extent_start)
1513 goto not_found;
50b78c24 1514 em->end = extent_end;
a52d9a80
CM		 1515 } else {
1516 em->end = end;
1517 }
1518 goto not_found_em;
1519 }
1520 em->block_start = EXTENT_MAP_INLINE;
1521 em->block_end = EXTENT_MAP_INLINE;
1522 em->start = extent_start;
50b78c24 1523 em->end = extent_end;
a52d9a80
CM		 1524 if (!page) {
1525 goto insert;
1526 }
1527 ptr = btrfs_file_extent_inline_start(item);
1528 map = kmap(page);
1529 memcpy(map + page_offset, ptr, size);
50b78c24
CM		 1530 memset(map + page_offset + size, 0,
1531 root->blocksize - (page_offset + size));
1532 flush_dcache_page(page);
a52d9a80
CM		 1533 kunmap(page);
1534 set_extent_uptodate(em_tree, extent_start,
50b78c24 1535 extent_end, GFP_NOFS);
a52d9a80
CM		 1536 goto insert;
1537 } else {
1538 printk("unkknown found_type %d\n", found_type);
1539 WARN_ON(1);
1540 }
1541not_found:
1542 em->start = start;
1543 em->end = end;
1544not_found_em:
1545 em->block_start = 0;
1546 em->block_end = 0;
1547insert:
1548 btrfs_release_path(root, path);
1549 if (em->start > start || em->end < start) {
b888db2b 1550 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em->start, em->end, start, end);
a52d9a80
CM		 1551 err = -EIO;
1552 goto out;
1553 }
1554 ret = add_extent_mapping(em_tree, em);
1555 if (ret == -EEXIST) {
1556 free_extent_map(em);
2bf5a725 1557 em = NULL;
a52d9a80
CM		 1558 failed_insert++;
1559 if (failed_insert > 5) {
1560 printk("failing to insert %Lu %Lu\n", start, end);
1561 err = -EIO;
1562 goto out;
1563 }
a52d9a80
CM		 1564 goto again;
1565 }
1566 err = 0;
1567out:
1568 btrfs_free_path(path);
1569 if (trans) {
1570 ret = btrfs_end_transaction(trans, root);
1571 if (!err)
1572 err = ret;
1573 }
1574 mutex_unlock(&root->fs_info->fs_mutex);
1575 if (err) {
1576 free_extent_map(em);
1577 WARN_ON(1);
1578 return ERR_PTR(err);
1579 }
1580 return em;
1581}
1582
d396c6f5 1583static sector_t btrfs_bmap(struct address_space *mapping, sector_t iblock)
39279cc3 1584{
d396c6f5 1585 return extent_bmap(mapping, iblock, btrfs_get_extent);
39279cc3
CM		 1586}
1587
1588static int btrfs_prepare_write(struct file *file, struct page *page,
1589 unsigned from, unsigned to)
1590{
a52d9a80
CM		 1591 return extent_prepare_write(&BTRFS_I(page->mapping->host)->extent_tree,
1592 page->mapping->host, page, from, to,
1593 btrfs_get_extent);
39279cc3
CM		 1594}
1595
a52d9a80 1596int btrfs_readpage(struct file *file, struct page *page)
9ebefb18 1597{
a52d9a80
CM		 1598 struct extent_map_tree *tree;
1599 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1600 return extent_read_full_page(tree, page, btrfs_get_extent);
9ebefb18 1601}
a52d9a80 1602static int btrfs_writepage(struct page *page, struct writeback_control *wbc)
39279cc3 1603{
a52d9a80 1604 struct extent_map_tree *tree;
b888db2b
CM		 1605
1606
1607 if (current->flags & PF_MEMALLOC) {
1608 redirty_page_for_writepage(wbc, page);
1609 unlock_page(page);
1610 return 0;
1611 }
a52d9a80
CM		 1612 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1613 return extent_write_full_page(tree, page, btrfs_get_extent, wbc);
9ebefb18
CM		 1614}
1615
a52d9a80 1616static int btrfs_releasepage(struct page *page, gfp_t unused_gfp_flags)
9ebefb18 1617{
a52d9a80
CM		 1618 struct extent_map_tree *tree;
1619 int ret;
8c2383c3 1620
a52d9a80
CM		 1621 if (page->private != 1) {
1622 WARN_ON(1);
1623 return try_to_free_buffers(page);
39279cc3 1624 }
a52d9a80
CM		 1625 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1626 ret = try_release_extent_mapping(tree, page);
1627 if (ret == 1) {
1628 ClearPagePrivate(page);
1629 set_page_private(page, 0);
1630 page_cache_release(page);
39279cc3 1631 }
a52d9a80 1632 return ret;
39279cc3
CM		 1633}
1634
a52d9a80 1635static void btrfs_invalidatepage(struct page *page, unsigned long offset)
39279cc3 1636{
a52d9a80 1637 struct extent_map_tree *tree;
39279cc3 1638
a52d9a80
CM		 1639 tree = &BTRFS_I(page->mapping->host)->extent_tree;
1640 extent_invalidatepage(tree, page, offset);
1641 btrfs_releasepage(page, GFP_NOFS);
39279cc3
CM		 1642}
1643
9ebefb18
CM		 1644/*
1645 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1646 * called from a page fault handler when a page is first dirtied. Hence we must
1647 * be careful to check for EOF conditions here. We set the page up correctly
1648 * for a written page which means we get ENOSPC checking when writing into
1649 * holes and correct delalloc and unwritten extent mapping on filesystems that
1650 * support these features.
1651 *
1652 * We are not allowed to take the i_mutex here so we have to play games to
1653 * protect against truncate races as the page could now be beyond EOF. Because
1654 * vmtruncate() writes the inode size before removing pages, once we have the
1655 * page lock we can determine safely if the page is beyond EOF. If it is not
1656 * beyond EOF, then the page is guaranteed safe against truncation until we
1657 * unlock the page.
1658 */
1659int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page)
1660{
1661 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
1662 unsigned long end;
1663 loff_t size;
1664 int ret = -EINVAL;
a52d9a80 1665 u64 page_start;
9ebefb18 1666
011410bd 1667 down_read(&BTRFS_I(inode)->root->snap_sem);
9ebefb18
CM		 1668 lock_page(page);
1669 wait_on_page_writeback(page);
9ebefb18 1670 size = i_size_read(inode);
a52d9a80
CM		 1671 page_start = page->index << PAGE_CACHE_SHIFT;
1672
9ebefb18 1673 if ((page->mapping != inode->i_mapping) ||
a52d9a80 1674 (page_start > size)) {
9ebefb18
CM		 1675 /* page got truncated out from underneath us */
1676 goto out_unlock;
1677 }
1678
1679 /* page is wholly or partially inside EOF */
a52d9a80 1680 if (page_start + PAGE_CACHE_SIZE > size)
9ebefb18
CM		 1681 end = size & ~PAGE_CACHE_MASK;
1682 else
1683 end = PAGE_CACHE_SIZE;
1684
b888db2b 1685 ret = btrfs_cow_one_page(inode, page, end);
9ebefb18
CM		 1686
1687out_unlock:
011410bd 1688 up_read(&BTRFS_I(inode)->root->snap_sem);
9ebefb18
CM		 1689 unlock_page(page);
1690 return ret;
1691}
1692
39279cc3
CM		 1693static void btrfs_truncate(struct inode *inode)
1694{
1695 struct btrfs_root *root = BTRFS_I(inode)->root;
1696 int ret;
1697 struct btrfs_trans_handle *trans;
d3c2fdcf 1698 unsigned long nr;
39279cc3
CM		 1699
1700 if (!S_ISREG(inode->i_mode))
1701 return;
1702 if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
1703 return;
1704
1705 btrfs_truncate_page(inode->i_mapping, inode->i_size);
1706
1707 mutex_lock(&root->fs_info->fs_mutex);
1708 trans = btrfs_start_transaction(root, 1);
1709 btrfs_set_trans_block_group(trans, inode);
1710
1711 /* FIXME, add redo link to tree so we don't leak on crash */
1712 ret = btrfs_truncate_in_trans(trans, root, inode);
39279cc3 1713 btrfs_update_inode(trans, root, inode);
d3c2fdcf 1714 nr = trans->blocks_used;
39279cc3
CM		 1715 ret = btrfs_end_transaction(trans, root);
1716 BUG_ON(ret);
1717 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1718 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 1719}
1720
1721int btrfs_commit_write(struct file *file, struct page *page,
1722 unsigned from, unsigned to)
1723{
a52d9a80
CM		 1724 return extent_commit_write(&BTRFS_I(page->mapping->host)->extent_tree,
1725 page->mapping->host, page, from, to);
39279cc3
CM		 1726}
1727
1728static int create_subvol(struct btrfs_root *root, char *name, int namelen)
1729{
1730 struct btrfs_trans_handle *trans;
1731 struct btrfs_key key;
1732 struct btrfs_root_item root_item;
1733 struct btrfs_inode_item *inode_item;
1734 struct buffer_head *subvol;
1735 struct btrfs_leaf *leaf;
1736 struct btrfs_root *new_root;
1737 struct inode *inode;
1738 struct inode *dir;
1739 int ret;
54aa1f4d 1740 int err;
39279cc3
CM		 1741 u64 objectid;
1742 u64 new_dirid = BTRFS_FIRST_FREE_OBJECTID;
d3c2fdcf 1743 unsigned long nr = 1;
39279cc3
CM		 1744
1745 mutex_lock(&root->fs_info->fs_mutex);
1746 trans = btrfs_start_transaction(root, 1);
1747 BUG_ON(!trans);
1748
6702ed49 1749 subvol = btrfs_alloc_free_block(trans, root, 0, 0);
54aa1f4d
CM		 1750 if (IS_ERR(subvol))
1751 return PTR_ERR(subvol);
39279cc3
CM		 1752 leaf = btrfs_buffer_leaf(subvol);
1753 btrfs_set_header_nritems(&leaf->header, 0);
1754 btrfs_set_header_level(&leaf->header, 0);
1755 btrfs_set_header_blocknr(&leaf->header, bh_blocknr(subvol));
1756 btrfs_set_header_generation(&leaf->header, trans->transid);
1757 btrfs_set_header_owner(&leaf->header, root->root_key.objectid);
1758 memcpy(leaf->header.fsid, root->fs_info->disk_super->fsid,
1759 sizeof(leaf->header.fsid));
ccd467d6 1760 btrfs_mark_buffer_dirty(subvol);
39279cc3
CM		 1761
1762 inode_item = &root_item.inode;
1763 memset(inode_item, 0, sizeof(*inode_item));
1764 btrfs_set_inode_generation(inode_item, 1);
1765 btrfs_set_inode_size(inode_item, 3);
1766 btrfs_set_inode_nlink(inode_item, 1);
1767 btrfs_set_inode_nblocks(inode_item, 1);
1768 btrfs_set_inode_mode(inode_item, S_IFDIR | 0755);
1769
1770 btrfs_set_root_blocknr(&root_item, bh_blocknr(subvol));
1771 btrfs_set_root_refs(&root_item, 1);
58176a96 1772 btrfs_set_root_blocks_used(&root_item, 0);
5eda7b5e
CM		 1773 memset(&root_item.drop_progress, 0, sizeof(root_item.drop_progress));
1774 root_item.drop_level = 0;
39279cc3
CM		 1775 brelse(subvol);
1776 subvol = NULL;
1777
1778 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
1779 0, &objectid);
54aa1f4d
CM		 1780 if (ret)
1781 goto fail;
39279cc3
CM		 1782
1783 btrfs_set_root_dirid(&root_item, new_dirid);
1784
1785 key.objectid = objectid;
1786 key.offset = 1;
1787 key.flags = 0;
1788 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
1789 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
1790 &root_item);
54aa1f4d
CM		 1791 if (ret)
1792 goto fail;
39279cc3
CM		 1793
1794 /*
1795 * insert the directory item
1796 */
1797 key.offset = (u64)-1;
1798 dir = root->fs_info->sb->s_root->d_inode;
1799 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
1800 name, namelen, dir->i_ino, &key,
1801 BTRFS_FT_DIR);
54aa1f4d
CM		 1802 if (ret)
1803 goto fail;
39279cc3
CM		 1804
1805 ret = btrfs_commit_transaction(trans, root);
54aa1f4d
CM		 1806 if (ret)
1807 goto fail_commit;
39279cc3 1808
58176a96 1809 new_root = btrfs_read_fs_root(root->fs_info, &key, name, namelen);
39279cc3
CM		 1810 BUG_ON(!new_root);
1811
1812 trans = btrfs_start_transaction(new_root, 1);
1813 BUG_ON(!trans);
1814
1815 inode = btrfs_new_inode(trans, new_root, new_dirid,
1816 BTRFS_I(dir)->block_group, S_IFDIR | 0700);
54aa1f4d
CM		 1817 if (IS_ERR(inode))
1818 goto fail;
39279cc3
CM		 1819 inode->i_op = &btrfs_dir_inode_operations;
1820 inode->i_fop = &btrfs_dir_file_operations;
34088780 1821 new_root->inode = inode;
39279cc3
CM		 1822
1823 ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
54aa1f4d
CM		 1824 if (ret)
1825 goto fail;
39279cc3
CM		 1826
1827 inode->i_nlink = 1;
1828 inode->i_size = 6;
1829 ret = btrfs_update_inode(trans, new_root, inode);
54aa1f4d
CM		 1830 if (ret)
1831 goto fail;
1832fail:
d3c2fdcf 1833 nr = trans->blocks_used;
54aa1f4d
CM		 1834 err = btrfs_commit_transaction(trans, root);
1835 if (err && !ret)
1836 ret = err;
1837fail_commit:
39279cc3 1838 mutex_unlock(&root->fs_info->fs_mutex);
d3c2fdcf 1839 btrfs_btree_balance_dirty(root, nr);
54aa1f4d 1840 return ret;
39279cc3
CM		 1841}
1842
1843static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
1844{
1845 struct btrfs_trans_handle *trans;
1846 struct btrfs_key key;
1847 struct btrfs_root_item new_root_item;
83df7c1d 1848 struct buffer_head *tmp;
39279cc3 1849 int ret;
54aa1f4d 1850 int err;
39279cc3 1851 u64 objectid;
d3c2fdcf 1852 unsigned long nr;
39279cc3
CM		 1853
1854 if (!root->ref_cows)
1855 return -EINVAL;
1856
011410bd
CM		 1857 down_write(&root->snap_sem);
1858 freeze_bdev(root->fs_info->sb->s_bdev);
1859 thaw_bdev(root->fs_info->sb->s_bdev, root->fs_info->sb);
1860
39279cc3
CM		 1861 mutex_lock(&root->fs_info->fs_mutex);
1862 trans = btrfs_start_transaction(root, 1);
1863 BUG_ON(!trans);
1864
1865 ret = btrfs_update_inode(trans, root, root->inode);
54aa1f4d
CM		 1866 if (ret)
1867 goto fail;
39279cc3
CM		 1868
1869 ret = btrfs_find_free_objectid(trans, root->fs_info->tree_root,
1870 0, &objectid);
54aa1f4d
CM		 1871 if (ret)
1872 goto fail;
39279cc3
CM		 1873
1874 memcpy(&new_root_item, &root->root_item,
1875 sizeof(new_root_item));
1876
1877 key.objectid = objectid;
1878 key.offset = 1;
1879 key.flags = 0;
1880 btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY);
83df7c1d 1881 btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp);
39279cc3
CM		 1882 btrfs_set_root_blocknr(&new_root_item, bh_blocknr(root->node));
1883
1884 ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key,
1885 &new_root_item);
54aa1f4d
CM		 1886 if (ret)
1887 goto fail;
39279cc3
CM		 1888
1889 /*
1890 * insert the directory item
1891 */
1892 key.offset = (u64)-1;
1893 ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root,
1894 name, namelen,
1895 root->fs_info->sb->s_root->d_inode->i_ino,
1896 &key, BTRFS_FT_DIR);
1897
54aa1f4d
CM		 1898 if (ret)
1899 goto fail;
39279cc3
CM		 1900
1901 ret = btrfs_inc_root_ref(trans, root);
54aa1f4d
CM		 1902 if (ret)
1903 goto fail;
54aa1f4d 1904fail:
d3c2fdcf 1905 nr = trans->blocks_used;
54aa1f4d
CM		 1906 err = btrfs_commit_transaction(trans, root);
1907 if (err && !ret)
1908 ret = err;
39279cc3 1909 mutex_unlock(&root->fs_info->fs_mutex);
011410bd 1910 up_write(&root->snap_sem);
d3c2fdcf 1911 btrfs_btree_balance_dirty(root, nr);
54aa1f4d 1912 return ret;
39279cc3
CM		 1913}
1914
86479a04
CM		 1915static unsigned long force_ra(struct address_space *mapping,
1916 struct file_ra_state *ra, struct file *file,
1917 pgoff_t offset, pgoff_t last_index)
1918{
1919 pgoff_t req_size;
1920
1921#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
1922 req_size = last_index - offset + 1;
1923 offset = page_cache_readahead(mapping, ra, file, offset, req_size);
1924 return offset;
1925#else
1926 req_size = min(last_index - offset + 1, (pgoff_t)128);
1927 page_cache_sync_readahead(mapping, ra, file, offset, req_size);
1928 return offset + req_size;
1929#endif
1930}
1931
1932int btrfs_defrag_file(struct file *file) {
1933 struct inode *inode = file->f_path.dentry->d_inode;
1934 struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree;
1935 struct page *page;
1936 unsigned long last_index;
1937 unsigned long ra_index = 0;
1938 u64 page_start;
1939 u64 page_end;
1940 unsigned long i;
1941
1942 mutex_lock(&inode->i_mutex);
1943 last_index = inode->i_size >> PAGE_CACHE_SHIFT;
1944 for (i = 0; i <= last_index; i++) {
1945 if (i == ra_index) {
1946 ra_index = force_ra(inode->i_mapping, &file->f_ra,
1947 file, ra_index, last_index);
1948 }
1949 page = grab_cache_page(inode->i_mapping, i);
1950 if (!page)
1951 goto out_unlock;
1952 if (!PageUptodate(page)) {
1953 btrfs_readpage(NULL, page);
1954 lock_page(page);
1955 if (!PageUptodate(page)) {
1956 unlock_page(page);
1957 page_cache_release(page);
1958 goto out_unlock;
1959 }
1960 }
1961 page_start = page->index << PAGE_CACHE_SHIFT;
1962 page_end = page_start + PAGE_CACHE_SIZE - 1;
1963
1964 lock_extent(em_tree, page_start, page_end, GFP_NOFS);
1965 set_extent_delalloc(em_tree, page_start,
1966 page_end, GFP_NOFS);
1967 unlock_extent(em_tree, page_start, page_end, GFP_NOFS);
1968 set_page_dirty(page);
1969 unlock_page(page);
1970 page_cache_release(page);
1971 balance_dirty_pages_ratelimited_nr(inode->i_mapping, 1);
1972 }
1973
1974out_unlock:
1975 mutex_unlock(&inode->i_mutex);
1976 return 0;
1977}
1978
d03581f4 1979static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
39279cc3 1980{
39279cc3 1981 struct btrfs_ioctl_vol_args vol_args;
39279cc3 1982 struct btrfs_dir_item *di;
39279cc3 1983 struct btrfs_path *path;
d03581f4 1984 int namelen;
39279cc3
CM		 1985 u64 root_dirid;
1986
d03581f4
CH		 1987 if (copy_from_user(&vol_args, arg, sizeof(vol_args)))
1988 return -EFAULT;
1989
1990 namelen = strlen(vol_args.name);
1991 if (namelen > BTRFS_VOL_NAME_MAX)
1992 return -EINVAL;
1993 if (strchr(vol_args.name, '/'))
1994 return -EINVAL;
1995
1996 path = btrfs_alloc_path();
1997 if (!path)
1998 return -ENOMEM;
1999
2000 root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
2001 mutex_lock(&root->fs_info->fs_mutex);
2002 di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
2003 path, root_dirid,
2004 vol_args.name, namelen, 0);
2005 mutex_unlock(&root->fs_info->fs_mutex);
2006 btrfs_free_path(path);
2007 if (di && !IS_ERR(di))
2008 return -EEXIST;
2009 if (IS_ERR(di))
2010 return PTR_ERR(di);
2011
2012 if (root == root->fs_info->tree_root)
2013 return create_subvol(root, vol_args.name, namelen);
2014 return create_snapshot(root, vol_args.name, namelen);
2015}
2016
2017static int btrfs_ioctl_defrag(struct file *file)
2018{
2019 struct inode *inode = file->f_path.dentry->d_inode;
2020 struct btrfs_root *root = BTRFS_I(inode)->root;
2021
2022 switch (inode->i_mode & S_IFMT) {
2023 case S_IFDIR:
39279cc3 2024 mutex_lock(&root->fs_info->fs_mutex);
d03581f4
CH		 2025 btrfs_defrag_root(root, 0);
2026 btrfs_defrag_root(root->fs_info->extent_root, 0);
39279cc3 2027 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3 2028 break;
d03581f4
CH		 2029 case S_IFREG:
2030 btrfs_defrag_file(file);
2031 break;
2032 }
2033
2034 return 0;
2035}
6702ed49 2036
d03581f4
CH		 2037long btrfs_ioctl(struct file *file, unsigned int
2038 cmd, unsigned long arg)
2039{
2040 struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root;
2041
2042 switch (cmd) {
2043 case BTRFS_IOC_SNAP_CREATE:
2044 return btrfs_ioctl_snap_create(root, (void __user *)arg);
6702ed49 2045 case BTRFS_IOC_DEFRAG:
d03581f4 2046 return btrfs_ioctl_defrag(file);
39279cc3 2047 }
d03581f4
CH		 2048
2049 return -ENOTTY;
39279cc3
CM		 2050}
2051
39279cc3
CM		 2052/*
2053 * Called inside transaction, so use GFP_NOFS
2054 */
2055struct inode *btrfs_alloc_inode(struct super_block *sb)
2056{
2057 struct btrfs_inode *ei;
2058
2059 ei = kmem_cache_alloc(btrfs_inode_cachep, GFP_NOFS);
2060 if (!ei)
2061 return NULL;
15ee9bc7 2062 ei->last_trans = 0;
39279cc3
CM		 2063 return &ei->vfs_inode;
2064}
2065
2066void btrfs_destroy_inode(struct inode *inode)
2067{
2068 WARN_ON(!list_empty(&inode->i_dentry));
2069 WARN_ON(inode->i_data.nrpages);
2070
2071 kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
2072}
2073
2074static void init_once(void * foo, struct kmem_cache * cachep,
2075 unsigned long flags)
2076{
2077 struct btrfs_inode *ei = (struct btrfs_inode *) foo;
2078
2079 inode_init_once(&ei->vfs_inode);
2080}
2081
2082void btrfs_destroy_cachep(void)
2083{
2084 if (btrfs_inode_cachep)
2085 kmem_cache_destroy(btrfs_inode_cachep);
2086 if (btrfs_trans_handle_cachep)
2087 kmem_cache_destroy(btrfs_trans_handle_cachep);
2088 if (btrfs_transaction_cachep)
2089 kmem_cache_destroy(btrfs_transaction_cachep);
2090 if (btrfs_bit_radix_cachep)
2091 kmem_cache_destroy(btrfs_bit_radix_cachep);
2092 if (btrfs_path_cachep)
2093 kmem_cache_destroy(btrfs_path_cachep);
2094}
2095
86479a04 2096struct kmem_cache *btrfs_cache_create(const char *name, size_t size,
92fee66d
CM		 2097 unsigned long extra_flags,
2098 void (*ctor)(void *, struct kmem_cache *,
2099 unsigned long))
2100{
2101 return kmem_cache_create(name, size, 0, (SLAB_RECLAIM_ACCOUNT |
2102 SLAB_MEM_SPREAD | extra_flags), ctor
2103#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2104 ,NULL
2105#endif
2106 );
2107}
2108
39279cc3
CM		 2109int btrfs_init_cachep(void)
2110{
86479a04 2111 btrfs_inode_cachep = btrfs_cache_create("btrfs_inode_cache",
92fee66d
CM		 2112 sizeof(struct btrfs_inode),
2113 0, init_once);
39279cc3
CM		 2114 if (!btrfs_inode_cachep)
2115 goto fail;
86479a04
CM		 2116 btrfs_trans_handle_cachep =
2117 btrfs_cache_create("btrfs_trans_handle_cache",
2118 sizeof(struct btrfs_trans_handle),
2119 0, NULL);
39279cc3
CM		 2120 if (!btrfs_trans_handle_cachep)
2121 goto fail;
86479a04 2122 btrfs_transaction_cachep = btrfs_cache_create("btrfs_transaction_cache",
39279cc3 2123 sizeof(struct btrfs_transaction),
92fee66d 2124 0, NULL);
39279cc3
CM		 2125 if (!btrfs_transaction_cachep)
2126 goto fail;
86479a04 2127 btrfs_path_cachep = btrfs_cache_create("btrfs_path_cache",
23223584 2128 sizeof(struct btrfs_path),
92fee66d 2129 0, NULL);
39279cc3
CM		 2130 if (!btrfs_path_cachep)
2131 goto fail;
86479a04 2132 btrfs_bit_radix_cachep = btrfs_cache_create("btrfs_radix", 256,
92fee66d 2133 SLAB_DESTROY_BY_RCU, NULL);
39279cc3
CM		 2134 if (!btrfs_bit_radix_cachep)
2135 goto fail;
2136 return 0;
2137fail:
2138 btrfs_destroy_cachep();
2139 return -ENOMEM;
2140}
2141
2142static int btrfs_getattr(struct vfsmount *mnt,
2143 struct dentry *dentry, struct kstat *stat)
2144{
2145 struct inode *inode = dentry->d_inode;
2146 generic_fillattr(inode, stat);
2147 stat->blksize = 256 * 1024;
2148 return 0;
2149}
2150
2151static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
2152 struct inode * new_dir,struct dentry *new_dentry)
2153{
2154 struct btrfs_trans_handle *trans;
2155 struct btrfs_root *root = BTRFS_I(old_dir)->root;
2156 struct inode *new_inode = new_dentry->d_inode;
2157 struct inode *old_inode = old_dentry->d_inode;
2158 struct timespec ctime = CURRENT_TIME;
2159 struct btrfs_path *path;
2160 struct btrfs_dir_item *di;
2161 int ret;
2162
2163 if (S_ISDIR(old_inode->i_mode) && new_inode &&
2164 new_inode->i_size > BTRFS_EMPTY_DIR_SIZE) {
2165 return -ENOTEMPTY;
2166 }
2167 mutex_lock(&root->fs_info->fs_mutex);
2168 trans = btrfs_start_transaction(root, 1);
2169 btrfs_set_trans_block_group(trans, new_dir);
2170 path = btrfs_alloc_path();
2171 if (!path) {
2172 ret = -ENOMEM;
2173 goto out_fail;
2174 }
2175
2176 old_dentry->d_inode->i_nlink++;
2177 old_dir->i_ctime = old_dir->i_mtime = ctime;
2178 new_dir->i_ctime = new_dir->i_mtime = ctime;
2179 old_inode->i_ctime = ctime;
2180 if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
2181 struct btrfs_key *location = &BTRFS_I(new_dir)->location;
2182 u64 old_parent_oid;
2183 di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
2184 "..", 2, -1);
2185 if (IS_ERR(di)) {
2186 ret = PTR_ERR(di);
2187 goto out_fail;
2188 }
2189 if (!di) {
2190 ret = -ENOENT;
2191 goto out_fail;
2192 }
2193 old_parent_oid = btrfs_disk_key_objectid(&di->location);
2194 ret = btrfs_del_item(trans, root, path);
2195 if (ret) {
39279cc3
CM		 2196 goto out_fail;
2197 }
2198 btrfs_release_path(root, path);
2199
2200 di = btrfs_lookup_dir_index_item(trans, root, path,
2201 old_inode->i_ino,
2202 old_parent_oid,
2203 "..", 2, -1);
2204 if (IS_ERR(di)) {
2205 ret = PTR_ERR(di);
2206 goto out_fail;
2207 }
2208 if (!di) {
2209 ret = -ENOENT;
2210 goto out_fail;
2211 }
2212 ret = btrfs_del_item(trans, root, path);
2213 if (ret) {
39279cc3
CM		 2214 goto out_fail;
2215 }
2216 btrfs_release_path(root, path);
2217
2218 ret = btrfs_insert_dir_item(trans, root, "..", 2,
2219 old_inode->i_ino, location,
2220 BTRFS_FT_DIR);
2221 if (ret)
2222 goto out_fail;
2223 }
2224
2225
2226 ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
2227 if (ret)
2228 goto out_fail;
2229
2230 if (new_inode) {
2231 new_inode->i_ctime = CURRENT_TIME;
2232 ret = btrfs_unlink_trans(trans, root, new_dir, new_dentry);
2233 if (ret)
2234 goto out_fail;
39279cc3
CM		 2235 }
2236 ret = btrfs_add_link(trans, new_dentry, old_inode);
2237 if (ret)
2238 goto out_fail;
2239
2240out_fail:
2241 btrfs_free_path(path);
2242 btrfs_end_transaction(trans, root);
2243 mutex_unlock(&root->fs_info->fs_mutex);
2244 return ret;
2245}
2246
2247static int btrfs_symlink(struct inode *dir, struct dentry *dentry,
2248 const char *symname)
2249{
2250 struct btrfs_trans_handle *trans;
2251 struct btrfs_root *root = BTRFS_I(dir)->root;
2252 struct btrfs_path *path;
2253 struct btrfs_key key;
2254 struct inode *inode;
2255 int err;
2256 int drop_inode = 0;
2257 u64 objectid;
2258 int name_len;
2259 int datasize;
2260 char *ptr;
2261 struct btrfs_file_extent_item *ei;
d3c2fdcf 2262 unsigned long nr;
39279cc3
CM		 2263
2264 name_len = strlen(symname) + 1;
2265 if (name_len > BTRFS_MAX_INLINE_DATA_SIZE(root))
2266 return -ENAMETOOLONG;
2267 mutex_lock(&root->fs_info->fs_mutex);
2268 trans = btrfs_start_transaction(root, 1);
2269 btrfs_set_trans_block_group(trans, dir);
2270
2271 err = btrfs_find_free_objectid(trans, root, dir->i_ino, &objectid);
2272 if (err) {
2273 err = -ENOSPC;
2274 goto out_unlock;
2275 }
2276
2277 inode = btrfs_new_inode(trans, root, objectid,
2278 BTRFS_I(dir)->block_group, S_IFLNK|S_IRWXUGO);
2279 err = PTR_ERR(inode);
2280 if (IS_ERR(inode))
2281 goto out_unlock;
2282
2283 btrfs_set_trans_block_group(trans, inode);
2284 err = btrfs_add_nondir(trans, dentry, inode);
2285 if (err)
2286 drop_inode = 1;
2287 else {
2288 inode->i_mapping->a_ops = &btrfs_aops;
2289 inode->i_fop = &btrfs_file_operations;
2290 inode->i_op = &btrfs_file_inode_operations;
a52d9a80
CM		 2291 extent_map_tree_init(&BTRFS_I(inode)->extent_tree,
2292 inode->i_mapping, GFP_NOFS);
07157aac 2293 BTRFS_I(inode)->extent_tree.ops = &btrfs_extent_map_ops;
39279cc3
CM		 2294 }
2295 dir->i_sb->s_dirt = 1;
2296 btrfs_update_inode_block_group(trans, inode);
2297 btrfs_update_inode_block_group(trans, dir);
2298 if (drop_inode)
2299 goto out_unlock;
2300
2301 path = btrfs_alloc_path();
2302 BUG_ON(!path);
2303 key.objectid = inode->i_ino;
2304 key.offset = 0;
2305 key.flags = 0;
2306 btrfs_set_key_type(&key, BTRFS_EXTENT_DATA_KEY);
2307 datasize = btrfs_file_extent_calc_inline_size(name_len);
2308 err = btrfs_insert_empty_item(trans, root, path, &key,
2309 datasize);
54aa1f4d
CM		 2310 if (err) {
2311 drop_inode = 1;
2312 goto out_unlock;
2313 }
39279cc3
CM		 2314 ei = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]),
2315 path->slots[0], struct btrfs_file_extent_item);
2316 btrfs_set_file_extent_generation(ei, trans->transid);
2317 btrfs_set_file_extent_type(ei,
2318 BTRFS_FILE_EXTENT_INLINE);
2319 ptr = btrfs_file_extent_inline_start(ei);
2320 btrfs_memcpy(root, path->nodes[0]->b_data,
2321 ptr, symname, name_len);
ccd467d6 2322 btrfs_mark_buffer_dirty(path->nodes[0]);
39279cc3
CM		 2323 btrfs_free_path(path);
2324 inode->i_op = &btrfs_symlink_inode_operations;
2325 inode->i_mapping->a_ops = &btrfs_symlink_aops;
2326 inode->i_size = name_len - 1;
54aa1f4d
CM		 2327 err = btrfs_update_inode(trans, root, inode);
2328 if (err)
2329 drop_inode = 1;
39279cc3
CM		 2330
2331out_unlock:
d3c2fdcf 2332 nr = trans->blocks_used;
39279cc3
CM		 2333 btrfs_end_transaction(trans, root);
2334 mutex_unlock(&root->fs_info->fs_mutex);
39279cc3
CM		 2335 if (drop_inode) {
2336 inode_dec_link_count(inode);
2337 iput(inode);
2338 }
d3c2fdcf 2339 btrfs_btree_balance_dirty(root, nr);
39279cc3
CM		 2340 return err;
2341}
2342
2343static struct inode_operations btrfs_dir_inode_operations = {
2344 .lookup = btrfs_lookup,
2345 .create = btrfs_create,
2346 .unlink = btrfs_unlink,
2347 .link = btrfs_link,
2348 .mkdir = btrfs_mkdir,
2349 .rmdir = btrfs_rmdir,
2350 .rename = btrfs_rename,
2351 .symlink = btrfs_symlink,
2352 .setattr = btrfs_setattr,
618e21d5 2353 .mknod = btrfs_mknod,
39279cc3
CM		 2354};
2355
2356static struct inode_operations btrfs_dir_ro_inode_operations = {
2357 .lookup = btrfs_lookup,
2358};
2359
2360static struct file_operations btrfs_dir_file_operations = {
2361 .llseek = generic_file_llseek,
2362 .read = generic_read_dir,
2363 .readdir = btrfs_readdir,
34287aa3 2364 .unlocked_ioctl = btrfs_ioctl,
39279cc3 2365#ifdef CONFIG_COMPAT
34287aa3 2366 .compat_ioctl = btrfs_ioctl,
39279cc3
CM		 2367#endif
2368};
2369
07157aac
CM		 2370static struct extent_map_ops btrfs_extent_map_ops = {
2371 .fill_delalloc = run_delalloc_range,
2372 .writepage_io_hook = btrfs_writepage_io_hook,
2373 .readpage_io_hook = btrfs_readpage_io_hook,
2374 .readpage_end_io_hook = btrfs_readpage_end_io_hook,
2375};
2376
39279cc3
CM		 2377static struct address_space_operations btrfs_aops = {
2378 .readpage = btrfs_readpage,
2379 .writepage = btrfs_writepage,
2380 .sync_page = block_sync_page,
2381 .prepare_write = btrfs_prepare_write,
2382 .commit_write = btrfs_commit_write,
2383 .bmap = btrfs_bmap,
a52d9a80
CM		 2384 .invalidatepage = btrfs_invalidatepage,
2385 .releasepage = btrfs_releasepage,
2386 .set_page_dirty = __set_page_dirty_nobuffers,
39279cc3
CM		 2387};
2388
2389static struct address_space_operations btrfs_symlink_aops = {
2390 .readpage = btrfs_readpage,
2391 .writepage = btrfs_writepage,
2bf5a725
CM		 2392 .invalidatepage = btrfs_invalidatepage,
2393 .releasepage = btrfs_releasepage,
39279cc3
CM		 2394};
2395
2396static struct inode_operations btrfs_file_inode_operations = {
2397 .truncate = btrfs_truncate,
2398 .getattr = btrfs_getattr,
2399 .setattr = btrfs_setattr,
2400};
2401
618e21d5
JB		 2402static struct inode_operations btrfs_special_inode_operations = {
2403 .getattr = btrfs_getattr,
2404 .setattr = btrfs_setattr,
2405};
2406
39279cc3
CM		 2407static struct inode_operations btrfs_symlink_inode_operations = {
2408 .readlink = generic_readlink,
2409 .follow_link = page_follow_link_light,
2410 .put_link = page_put_link,
2411};
Linux 6.x block layer and io_uring tree(s)