2 * Copyright (C) 2007 Oracle. All rights reserved.
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.
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.
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.
19 #include <linux/buffer_head.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>
33 #include <linux/bit_spinlock.h>
34 #include <linux/version.h>
37 #include "transaction.h"
38 #include "btrfs_inode.h"
40 #include "print-tree.h"
42 struct btrfs_iget_args
{
44 struct btrfs_root
*root
;
47 static struct inode_operations btrfs_dir_inode_operations
;
48 static struct inode_operations btrfs_symlink_inode_operations
;
49 static struct inode_operations btrfs_dir_ro_inode_operations
;
50 static struct inode_operations btrfs_special_inode_operations
;
51 static struct inode_operations btrfs_file_inode_operations
;
52 static struct address_space_operations btrfs_aops
;
53 static struct address_space_operations btrfs_symlink_aops
;
54 static struct file_operations btrfs_dir_file_operations
;
55 static struct extent_map_ops btrfs_extent_map_ops
;
57 static struct kmem_cache
*btrfs_inode_cachep
;
58 struct kmem_cache
*btrfs_trans_handle_cachep
;
59 struct kmem_cache
*btrfs_transaction_cachep
;
60 struct kmem_cache
*btrfs_bit_radix_cachep
;
61 struct kmem_cache
*btrfs_path_cachep
;
64 static 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
,
74 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
76 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
77 struct btrfs_trans_handle
*trans
;
82 u64 blocksize
= 1 << inode
->i_blkbits
;
84 mutex_lock(&root
->fs_info
->fs_mutex
);
85 trans
= btrfs_start_transaction(root
, 1);
86 btrfs_set_trans_block_group(trans
, inode
);
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);
98 ret
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
99 start
, ins
.objectid
, ins
.offset
,
102 btrfs_end_transaction(trans
, root
);
103 mutex_unlock(&root
->fs_info
->fs_mutex
);
107 int btrfs_writepage_io_hook(struct page
*page
, u64 start
, u64 end
)
109 struct inode
*inode
= page
->mapping
->host
;
110 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
111 struct btrfs_trans_handle
*trans
;
114 u64 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
115 size_t offset
= start
- page_start
;
117 mutex_lock(&root
->fs_info
->fs_mutex
);
118 trans
= btrfs_start_transaction(root
, 1);
119 btrfs_set_trans_block_group(trans
, inode
);
121 btrfs_csum_file_block(trans
, root
, inode
->i_ino
,
122 start
, kaddr
+ offset
, end
- start
+ 1);
124 ret
= btrfs_end_transaction(trans
, root
);
126 mutex_unlock(&root
->fs_info
->fs_mutex
);
130 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
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
;
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);
145 /* a csum that isn't present is a preallocated region. */
146 if (ret
== -ENOENT
|| ret
== -EFBIG
)
151 memcpy((char *)&private, &item
->csum
, BTRFS_CRC32_SIZE
);
152 set_state_private(em_tree
, start
, private);
155 btrfs_free_path(path
);
156 mutex_unlock(&root
->fs_info
->fs_mutex
);
160 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
)
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
;
171 ret
= get_state_private(em_tree
, start
, &private);
172 kaddr
= kmap_atomic(page
, KM_IRQ0
);
176 ret
= btrfs_csum_data(root
, kaddr
+ offset
, end
- start
+ 1, csum
);
178 if (memcmp(csum
, &private, BTRFS_CRC32_SIZE
)) {
181 kunmap_atomic(kaddr
, KM_IRQ0
);
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
);
192 void btrfs_read_locked_inode(struct inode
*inode
)
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
;
202 path
= btrfs_alloc_path();
204 mutex_lock(&root
->fs_info
->fs_mutex
);
206 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
207 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
209 btrfs_free_path(path
);
212 inode_item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
214 struct btrfs_inode_item
);
216 inode
->i_mode
= btrfs_inode_mode(inode_item
);
217 inode
->i_nlink
= btrfs_inode_nlink(inode_item
);
218 inode
->i_uid
= btrfs_inode_uid(inode_item
);
219 inode
->i_gid
= btrfs_inode_gid(inode_item
);
220 inode
->i_size
= btrfs_inode_size(inode_item
);
221 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(&inode_item
->atime
);
222 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->atime
);
223 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(&inode_item
->mtime
);
224 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->mtime
);
225 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(&inode_item
->ctime
);
226 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(&inode_item
->ctime
);
227 inode
->i_blocks
= btrfs_inode_nblocks(inode_item
);
228 inode
->i_generation
= btrfs_inode_generation(inode_item
);
230 rdev
= btrfs_inode_rdev(inode_item
);
231 alloc_group_block
= btrfs_inode_block_group(inode_item
);
232 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
235 btrfs_free_path(path
);
238 mutex_unlock(&root
->fs_info
->fs_mutex
);
240 switch (inode
->i_mode
& S_IFMT
) {
242 inode
->i_mapping
->a_ops
= &btrfs_aops
;
243 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
244 inode
->i_fop
= &btrfs_file_operations
;
245 inode
->i_op
= &btrfs_file_inode_operations
;
248 inode
->i_fop
= &btrfs_dir_file_operations
;
249 if (root
== root
->fs_info
->tree_root
)
250 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
252 inode
->i_op
= &btrfs_dir_inode_operations
;
255 inode
->i_op
= &btrfs_symlink_inode_operations
;
256 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
259 init_special_inode(inode
, inode
->i_mode
, rdev
);
265 btrfs_release_path(root
, path
);
266 btrfs_free_path(path
);
267 mutex_unlock(&root
->fs_info
->fs_mutex
);
268 make_bad_inode(inode
);
271 static void fill_inode_item(struct btrfs_inode_item
*item
,
274 btrfs_set_inode_uid(item
, inode
->i_uid
);
275 btrfs_set_inode_gid(item
, inode
->i_gid
);
276 btrfs_set_inode_size(item
, inode
->i_size
);
277 btrfs_set_inode_mode(item
, inode
->i_mode
);
278 btrfs_set_inode_nlink(item
, inode
->i_nlink
);
279 btrfs_set_timespec_sec(&item
->atime
, inode
->i_atime
.tv_sec
);
280 btrfs_set_timespec_nsec(&item
->atime
, inode
->i_atime
.tv_nsec
);
281 btrfs_set_timespec_sec(&item
->mtime
, inode
->i_mtime
.tv_sec
);
282 btrfs_set_timespec_nsec(&item
->mtime
, inode
->i_mtime
.tv_nsec
);
283 btrfs_set_timespec_sec(&item
->ctime
, inode
->i_ctime
.tv_sec
);
284 btrfs_set_timespec_nsec(&item
->ctime
, inode
->i_ctime
.tv_nsec
);
285 btrfs_set_inode_nblocks(item
, inode
->i_blocks
);
286 btrfs_set_inode_generation(item
, inode
->i_generation
);
287 btrfs_set_inode_rdev(item
, inode
->i_rdev
);
288 btrfs_set_inode_block_group(item
,
289 BTRFS_I(inode
)->block_group
->key
.objectid
);
292 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
293 struct btrfs_root
*root
,
296 struct btrfs_inode_item
*inode_item
;
297 struct btrfs_path
*path
;
300 path
= btrfs_alloc_path();
302 ret
= btrfs_lookup_inode(trans
, root
, path
,
303 &BTRFS_I(inode
)->location
, 1);
310 inode_item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
312 struct btrfs_inode_item
);
314 fill_inode_item(inode_item
, inode
);
315 btrfs_mark_buffer_dirty(path
->nodes
[0]);
316 btrfs_set_inode_last_trans(trans
, inode
);
319 btrfs_release_path(root
, path
);
320 btrfs_free_path(path
);
325 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
326 struct btrfs_root
*root
,
328 struct dentry
*dentry
)
330 struct btrfs_path
*path
;
331 const char *name
= dentry
->d_name
.name
;
332 int name_len
= dentry
->d_name
.len
;
335 struct btrfs_dir_item
*di
;
337 path
= btrfs_alloc_path();
343 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
353 objectid
= btrfs_disk_key_objectid(&di
->location
);
354 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
357 btrfs_release_path(root
, path
);
359 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
360 objectid
, name
, name_len
, -1);
369 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
371 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
373 btrfs_free_path(path
);
375 dir
->i_size
-= name_len
* 2;
376 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
377 btrfs_update_inode(trans
, root
, dir
);
378 drop_nlink(dentry
->d_inode
);
379 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
380 dir
->i_sb
->s_dirt
= 1;
385 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
387 struct btrfs_root
*root
;
388 struct btrfs_trans_handle
*trans
;
392 root
= BTRFS_I(dir
)->root
;
393 mutex_lock(&root
->fs_info
->fs_mutex
);
394 trans
= btrfs_start_transaction(root
, 1);
395 btrfs_set_trans_block_group(trans
, dir
);
396 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
397 nr
= trans
->blocks_used
;
398 btrfs_end_transaction(trans
, root
);
399 mutex_unlock(&root
->fs_info
->fs_mutex
);
400 btrfs_btree_balance_dirty(root
, nr
);
404 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
406 struct inode
*inode
= dentry
->d_inode
;
409 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
410 struct btrfs_path
*path
;
411 struct btrfs_key key
;
412 struct btrfs_trans_handle
*trans
;
413 struct btrfs_key found_key
;
415 struct btrfs_leaf
*leaf
;
416 char *goodnames
= "..";
419 path
= btrfs_alloc_path();
421 mutex_lock(&root
->fs_info
->fs_mutex
);
422 trans
= btrfs_start_transaction(root
, 1);
423 btrfs_set_trans_block_group(trans
, dir
);
424 key
.objectid
= inode
->i_ino
;
425 key
.offset
= (u64
)-1;
428 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
434 if (path
->slots
[0] == 0) {
439 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
440 btrfs_disk_key_to_cpu(&found_key
,
441 &leaf
->items
[path
->slots
[0]].key
);
442 found_type
= btrfs_key_type(&found_key
);
443 if (found_key
.objectid
!= inode
->i_ino
) {
447 if ((found_type
!= BTRFS_DIR_ITEM_KEY
&&
448 found_type
!= BTRFS_DIR_INDEX_KEY
) ||
449 (!btrfs_match_dir_item_name(root
, path
, goodnames
, 2) &&
450 !btrfs_match_dir_item_name(root
, path
, goodnames
, 1))) {
454 ret
= btrfs_del_item(trans
, root
, path
);
457 if (found_type
== BTRFS_DIR_ITEM_KEY
&& found_key
.offset
== 1)
459 btrfs_release_path(root
, path
);
462 btrfs_release_path(root
, path
);
464 /* now the directory is empty */
465 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
470 btrfs_release_path(root
, path
);
471 btrfs_free_path(path
);
472 mutex_unlock(&root
->fs_info
->fs_mutex
);
473 nr
= trans
->blocks_used
;
474 ret
= btrfs_end_transaction(trans
, root
);
475 btrfs_btree_balance_dirty(root
, nr
);
481 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
482 struct btrfs_root
*root
,
485 struct btrfs_path
*path
;
490 path
= btrfs_alloc_path();
492 ret
= btrfs_lookup_inode(trans
, root
, path
,
493 &BTRFS_I(inode
)->location
, -1);
497 ret
= btrfs_del_item(trans
, root
, path
);
498 btrfs_free_path(path
);
503 * this can truncate away extent items, csum items and directory items.
504 * It starts at a high offset and removes keys until it can't find
505 * any higher than i_size.
507 * csum items that cross the new i_size are truncated to the new size
510 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
511 struct btrfs_root
*root
,
515 struct btrfs_path
*path
;
516 struct btrfs_key key
;
517 struct btrfs_disk_key
*found_key
;
519 struct btrfs_leaf
*leaf
;
520 struct btrfs_file_extent_item
*fi
;
521 u64 extent_start
= 0;
522 u64 extent_num_blocks
= 0;
527 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
528 path
= btrfs_alloc_path();
531 /* FIXME, add redo link to tree so we don't leak on crash */
532 key
.objectid
= inode
->i_ino
;
533 key
.offset
= (u64
)-1;
536 btrfs_init_path(path
);
538 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
543 BUG_ON(path
->slots
[0] == 0);
546 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
547 found_key
= &leaf
->items
[path
->slots
[0]].key
;
548 found_type
= btrfs_disk_key_type(found_key
);
550 if (btrfs_disk_key_objectid(found_key
) != inode
->i_ino
)
552 if (found_type
!= BTRFS_CSUM_ITEM_KEY
&&
553 found_type
!= BTRFS_DIR_ITEM_KEY
&&
554 found_type
!= BTRFS_DIR_INDEX_KEY
&&
555 found_type
!= BTRFS_EXTENT_DATA_KEY
)
558 item_end
= btrfs_disk_key_offset(found_key
);
559 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
560 fi
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
562 struct btrfs_file_extent_item
);
563 if (btrfs_file_extent_type(fi
) !=
564 BTRFS_FILE_EXTENT_INLINE
) {
565 item_end
+= btrfs_file_extent_num_blocks(fi
) <<
569 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
570 ret
= btrfs_csum_truncate(trans
, root
, path
,
574 if (item_end
< inode
->i_size
) {
575 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
576 found_type
= BTRFS_INODE_ITEM_KEY
;
577 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
578 found_type
= BTRFS_CSUM_ITEM_KEY
;
579 } else if (found_type
) {
584 btrfs_set_key_type(&key
, found_type
);
587 if (btrfs_disk_key_offset(found_key
) >= inode
->i_size
)
593 /* FIXME, shrink the extent if the ref count is only 1 */
594 if (found_type
== BTRFS_EXTENT_DATA_KEY
&&
595 btrfs_file_extent_type(fi
) !=
596 BTRFS_FILE_EXTENT_INLINE
) {
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
) +
604 extent_num_blocks
>>= inode
->i_blkbits
;
605 btrfs_set_file_extent_num_blocks(fi
,
607 inode
->i_blocks
-= (orig_num_blocks
-
608 extent_num_blocks
) << 3;
609 btrfs_mark_buffer_dirty(path
->nodes
[0]);
612 btrfs_file_extent_disk_blocknr(fi
);
614 btrfs_file_extent_disk_num_blocks(fi
);
615 /* FIXME blocksize != 4096 */
616 num_dec
= btrfs_file_extent_num_blocks(fi
) << 3;
617 if (extent_start
!= 0) {
619 inode
->i_blocks
-= num_dec
;
624 ret
= btrfs_del_item(trans
, root
, path
);
630 btrfs_release_path(root
, path
);
632 ret
= btrfs_free_extent(trans
, root
, extent_start
,
633 extent_num_blocks
, 0);
639 btrfs_release_path(root
, path
);
640 btrfs_free_path(path
);
641 inode
->i_sb
->s_dirt
= 1;
645 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
650 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
651 u64 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
652 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
654 if (!PagePrivate(page
)) {
655 SetPagePrivate(page
);
656 set_page_private(page
, 1);
657 WARN_ON(!page
->mapping
->a_ops
->invalidatepage
);
658 page_cache_get(page
);
661 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
662 set_extent_delalloc(&BTRFS_I(inode
)->extent_tree
, page_start
,
664 if (zero_start
!= PAGE_CACHE_SIZE
) {
666 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
667 flush_dcache_page(page
);
670 set_page_dirty(page
);
671 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
677 * taken from block_truncate_page, but does cow as it zeros out
678 * any bytes left in the last page in the file.
680 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
682 struct inode
*inode
= mapping
->host
;
683 unsigned blocksize
= 1 << inode
->i_blkbits
;
684 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
685 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
690 if ((offset
& (blocksize
- 1)) == 0)
693 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
695 page
= grab_cache_page(mapping
, index
);
698 if (!PageUptodate(page
)) {
699 ret
= btrfs_readpage(NULL
, page
);
701 if (!PageUptodate(page
)) {
706 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
708 ret
= btrfs_cow_one_page(inode
, page
, offset
);
711 page_cache_release(page
);
712 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
717 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
719 struct inode
*inode
= dentry
->d_inode
;
722 err
= inode_change_ok(inode
, attr
);
726 if (S_ISREG(inode
->i_mode
) &&
727 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
728 struct btrfs_trans_handle
*trans
;
729 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
730 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
732 u64 mask
= root
->blocksize
- 1;
733 u64 pos
= (inode
->i_size
+ mask
) & ~mask
;
734 u64 block_end
= attr
->ia_size
| mask
;
738 if (attr
->ia_size
<= pos
)
741 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
743 lock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
744 hole_size
= (attr
->ia_size
- pos
+ mask
) & ~mask
;
746 mutex_lock(&root
->fs_info
->fs_mutex
);
747 trans
= btrfs_start_transaction(root
, 1);
748 btrfs_set_trans_block_group(trans
, inode
);
749 err
= btrfs_drop_extents(trans
, root
, inode
,
750 pos
, pos
+ hole_size
, &alloc_hint
);
752 hole_size
>>= inode
->i_blkbits
;
754 err
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
755 pos
, 0, 0, hole_size
);
756 btrfs_end_transaction(trans
, root
);
757 mutex_unlock(&root
->fs_info
->fs_mutex
);
758 unlock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
763 err
= inode_setattr(inode
, attr
);
767 void btrfs_delete_inode(struct inode
*inode
)
769 struct btrfs_trans_handle
*trans
;
770 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
774 truncate_inode_pages(&inode
->i_data
, 0);
775 if (is_bad_inode(inode
)) {
779 mutex_lock(&root
->fs_info
->fs_mutex
);
780 trans
= btrfs_start_transaction(root
, 1);
781 btrfs_set_trans_block_group(trans
, inode
);
782 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
785 ret
= btrfs_free_inode(trans
, root
, inode
);
788 nr
= trans
->blocks_used
;
789 btrfs_end_transaction(trans
, root
);
790 mutex_unlock(&root
->fs_info
->fs_mutex
);
791 btrfs_btree_balance_dirty(root
, nr
);
795 nr
= trans
->blocks_used
;
796 btrfs_end_transaction(trans
, root
);
797 mutex_unlock(&root
->fs_info
->fs_mutex
);
798 btrfs_btree_balance_dirty(root
, nr
);
804 * this returns the key found in the dir entry in the location pointer.
805 * If no dir entries were found, location->objectid is 0.
807 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
808 struct btrfs_key
*location
)
810 const char *name
= dentry
->d_name
.name
;
811 int namelen
= dentry
->d_name
.len
;
812 struct btrfs_dir_item
*di
;
813 struct btrfs_path
*path
;
814 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
817 path
= btrfs_alloc_path();
819 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
821 if (!di
|| IS_ERR(di
)) {
822 location
->objectid
= 0;
826 btrfs_disk_key_to_cpu(location
, &di
->location
);
828 btrfs_release_path(root
, path
);
829 btrfs_free_path(path
);
834 * when we hit a tree root in a directory, the btrfs part of the inode
835 * needs to be changed to reflect the root directory of the tree root. This
836 * is kind of like crossing a mount point.
838 static int fixup_tree_root_location(struct btrfs_root
*root
,
839 struct btrfs_key
*location
,
840 struct btrfs_root
**sub_root
,
841 struct dentry
*dentry
)
843 struct btrfs_path
*path
;
844 struct btrfs_root_item
*ri
;
846 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
848 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
851 path
= btrfs_alloc_path();
853 mutex_lock(&root
->fs_info
->fs_mutex
);
855 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
858 if (IS_ERR(*sub_root
))
859 return PTR_ERR(*sub_root
);
861 ri
= &(*sub_root
)->root_item
;
862 location
->objectid
= btrfs_root_dirid(ri
);
864 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
865 location
->offset
= 0;
867 btrfs_free_path(path
);
868 mutex_unlock(&root
->fs_info
->fs_mutex
);
872 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
874 struct btrfs_iget_args
*args
= p
;
875 inode
->i_ino
= args
->ino
;
876 BTRFS_I(inode
)->root
= args
->root
;
877 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
878 inode
->i_mapping
, GFP_NOFS
);
882 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
884 struct btrfs_iget_args
*args
= opaque
;
885 return (args
->ino
== inode
->i_ino
&&
886 args
->root
== BTRFS_I(inode
)->root
);
889 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
890 struct btrfs_root
*root
)
893 struct btrfs_iget_args args
;
897 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
898 btrfs_init_locked_inode
,
903 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
904 struct nameidata
*nd
)
906 struct inode
* inode
;
907 struct btrfs_inode
*bi
= BTRFS_I(dir
);
908 struct btrfs_root
*root
= bi
->root
;
909 struct btrfs_root
*sub_root
= root
;
910 struct btrfs_key location
;
913 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
914 return ERR_PTR(-ENAMETOOLONG
);
915 mutex_lock(&root
->fs_info
->fs_mutex
);
916 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
917 mutex_unlock(&root
->fs_info
->fs_mutex
);
921 if (location
.objectid
) {
922 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
927 return ERR_PTR(-ENOENT
);
928 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
931 return ERR_PTR(-EACCES
);
932 if (inode
->i_state
& I_NEW
) {
933 /* the inode and parent dir are two different roots */
934 if (sub_root
!= root
) {
936 sub_root
->inode
= inode
;
938 BTRFS_I(inode
)->root
= sub_root
;
939 memcpy(&BTRFS_I(inode
)->location
, &location
,
941 btrfs_read_locked_inode(inode
);
942 unlock_new_inode(inode
);
945 return d_splice_alias(inode
, dentry
);
948 static unsigned char btrfs_filetype_table
[] = {
949 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
952 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
954 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
955 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
956 struct btrfs_item
*item
;
957 struct btrfs_dir_item
*di
;
958 struct btrfs_key key
;
959 struct btrfs_path
*path
;
962 struct btrfs_leaf
*leaf
;
965 unsigned char d_type
;
970 int key_type
= BTRFS_DIR_INDEX_KEY
;
972 /* FIXME, use a real flag for deciding about the key type */
973 if (root
->fs_info
->tree_root
== root
)
974 key_type
= BTRFS_DIR_ITEM_KEY
;
975 mutex_lock(&root
->fs_info
->fs_mutex
);
976 key
.objectid
= inode
->i_ino
;
978 btrfs_set_key_type(&key
, key_type
);
979 key
.offset
= filp
->f_pos
;
980 path
= btrfs_alloc_path();
982 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
987 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
988 nritems
= btrfs_header_nritems(&leaf
->header
);
989 slot
= path
->slots
[0];
990 if (advance
|| slot
>= nritems
) {
991 if (slot
>= nritems
-1) {
992 ret
= btrfs_next_leaf(root
, path
);
995 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
996 nritems
= btrfs_header_nritems(&leaf
->header
);
997 slot
= path
->slots
[0];
1004 item
= leaf
->items
+ slot
;
1005 if (btrfs_disk_key_objectid(&item
->key
) != key
.objectid
)
1007 if (btrfs_disk_key_type(&item
->key
) != key_type
)
1009 if (btrfs_disk_key_offset(&item
->key
) < filp
->f_pos
)
1011 filp
->f_pos
= btrfs_disk_key_offset(&item
->key
);
1013 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1015 di_total
= btrfs_item_size(leaf
->items
+ slot
);
1016 while(di_cur
< di_total
) {
1017 d_type
= btrfs_filetype_table
[btrfs_dir_type(di
)];
1018 over
= filldir(dirent
, (const char *)(di
+ 1),
1019 btrfs_dir_name_len(di
),
1020 btrfs_disk_key_offset(&item
->key
),
1021 btrfs_disk_key_objectid(&di
->location
),
1025 di_len
= btrfs_dir_name_len(di
) + sizeof(*di
);
1027 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1034 btrfs_release_path(root
, path
);
1035 btrfs_free_path(path
);
1036 mutex_unlock(&root
->fs_info
->fs_mutex
);
1040 int btrfs_write_inode(struct inode
*inode
, int wait
)
1042 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1043 struct btrfs_trans_handle
*trans
;
1047 mutex_lock(&root
->fs_info
->fs_mutex
);
1048 trans
= btrfs_start_transaction(root
, 1);
1049 btrfs_set_trans_block_group(trans
, inode
);
1050 ret
= btrfs_commit_transaction(trans
, root
);
1051 mutex_unlock(&root
->fs_info
->fs_mutex
);
1057 * This is somewhat expensive, updating the tree every time the
1058 * inode changes. But, it is most likely to find the inode in cache.
1059 * FIXME, needs more benchmarking...there are no reasons other than performance
1060 * to keep or drop this code.
1062 void btrfs_dirty_inode(struct inode
*inode
)
1064 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1065 struct btrfs_trans_handle
*trans
;
1067 mutex_lock(&root
->fs_info
->fs_mutex
);
1068 trans
= btrfs_start_transaction(root
, 1);
1069 btrfs_set_trans_block_group(trans
, inode
);
1070 btrfs_update_inode(trans
, root
, inode
);
1071 btrfs_end_transaction(trans
, root
);
1072 mutex_unlock(&root
->fs_info
->fs_mutex
);
1075 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1076 struct btrfs_root
*root
,
1078 struct btrfs_block_group_cache
*group
,
1081 struct inode
*inode
;
1082 struct btrfs_inode_item inode_item
;
1083 struct btrfs_key
*location
;
1087 inode
= new_inode(root
->fs_info
->sb
);
1089 return ERR_PTR(-ENOMEM
);
1091 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1092 inode
->i_mapping
, GFP_NOFS
);
1093 BTRFS_I(inode
)->root
= root
;
1099 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1100 BTRFS_I(inode
)->block_group
= group
;
1102 inode
->i_uid
= current
->fsuid
;
1103 inode
->i_gid
= current
->fsgid
;
1104 inode
->i_mode
= mode
;
1105 inode
->i_ino
= objectid
;
1106 inode
->i_blocks
= 0;
1107 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1108 fill_inode_item(&inode_item
, inode
);
1109 location
= &BTRFS_I(inode
)->location
;
1110 location
->objectid
= objectid
;
1111 location
->flags
= 0;
1112 location
->offset
= 0;
1113 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1115 ret
= btrfs_insert_inode(trans
, root
, objectid
, &inode_item
);
1117 return ERR_PTR(ret
);
1118 insert_inode_hash(inode
);
1122 static inline u8
btrfs_inode_type(struct inode
*inode
)
1124 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1127 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1128 struct dentry
*dentry
, struct inode
*inode
)
1131 struct btrfs_key key
;
1132 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1133 struct inode
*parent_inode
;
1134 key
.objectid
= inode
->i_ino
;
1136 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1139 ret
= btrfs_insert_dir_item(trans
, root
,
1140 dentry
->d_name
.name
, dentry
->d_name
.len
,
1141 dentry
->d_parent
->d_inode
->i_ino
,
1142 &key
, btrfs_inode_type(inode
));
1144 parent_inode
= dentry
->d_parent
->d_inode
;
1145 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1146 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1147 ret
= btrfs_update_inode(trans
, root
,
1148 dentry
->d_parent
->d_inode
);
1153 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1154 struct dentry
*dentry
, struct inode
*inode
)
1156 int err
= btrfs_add_link(trans
, dentry
, inode
);
1158 d_instantiate(dentry
, inode
);
1166 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1167 int mode
, dev_t rdev
)
1169 struct btrfs_trans_handle
*trans
;
1170 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1171 struct inode
*inode
;
1177 if (!new_valid_dev(rdev
))
1180 mutex_lock(&root
->fs_info
->fs_mutex
);
1181 trans
= btrfs_start_transaction(root
, 1);
1182 btrfs_set_trans_block_group(trans
, dir
);
1184 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1190 inode
= btrfs_new_inode(trans
, root
, objectid
,
1191 BTRFS_I(dir
)->block_group
, mode
);
1192 err
= PTR_ERR(inode
);
1196 btrfs_set_trans_block_group(trans
, inode
);
1197 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1201 inode
->i_op
= &btrfs_special_inode_operations
;
1202 init_special_inode(inode
, inode
->i_mode
, rdev
);
1203 btrfs_update_inode(trans
, root
, inode
);
1205 dir
->i_sb
->s_dirt
= 1;
1206 btrfs_update_inode_block_group(trans
, inode
);
1207 btrfs_update_inode_block_group(trans
, dir
);
1209 nr
= trans
->blocks_used
;
1210 btrfs_end_transaction(trans
, root
);
1211 mutex_unlock(&root
->fs_info
->fs_mutex
);
1214 inode_dec_link_count(inode
);
1217 btrfs_btree_balance_dirty(root
, nr
);
1221 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1222 int mode
, struct nameidata
*nd
)
1224 struct btrfs_trans_handle
*trans
;
1225 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1226 struct inode
*inode
;
1232 mutex_lock(&root
->fs_info
->fs_mutex
);
1233 trans
= btrfs_start_transaction(root
, 1);
1234 btrfs_set_trans_block_group(trans
, dir
);
1236 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1242 inode
= btrfs_new_inode(trans
, root
, objectid
,
1243 BTRFS_I(dir
)->block_group
, mode
);
1244 err
= PTR_ERR(inode
);
1248 btrfs_set_trans_block_group(trans
, inode
);
1249 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1253 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1254 inode
->i_fop
= &btrfs_file_operations
;
1255 inode
->i_op
= &btrfs_file_inode_operations
;
1256 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1257 inode
->i_mapping
, GFP_NOFS
);
1258 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
1260 dir
->i_sb
->s_dirt
= 1;
1261 btrfs_update_inode_block_group(trans
, inode
);
1262 btrfs_update_inode_block_group(trans
, dir
);
1264 nr
= trans
->blocks_used
;
1265 btrfs_end_transaction(trans
, root
);
1266 mutex_unlock(&root
->fs_info
->fs_mutex
);
1269 inode_dec_link_count(inode
);
1272 btrfs_btree_balance_dirty(root
, nr
);
1276 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1277 struct dentry
*dentry
)
1279 struct btrfs_trans_handle
*trans
;
1280 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1281 struct inode
*inode
= old_dentry
->d_inode
;
1286 if (inode
->i_nlink
== 0)
1290 mutex_lock(&root
->fs_info
->fs_mutex
);
1291 trans
= btrfs_start_transaction(root
, 1);
1292 btrfs_set_trans_block_group(trans
, dir
);
1293 atomic_inc(&inode
->i_count
);
1294 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1297 dir
->i_sb
->s_dirt
= 1;
1298 btrfs_update_inode_block_group(trans
, dir
);
1299 err
= btrfs_update_inode(trans
, root
, inode
);
1303 nr
= trans
->blocks_used
;
1304 btrfs_end_transaction(trans
, root
);
1305 mutex_unlock(&root
->fs_info
->fs_mutex
);
1308 inode_dec_link_count(inode
);
1311 btrfs_btree_balance_dirty(root
, nr
);
1315 static int btrfs_make_empty_dir(struct btrfs_trans_handle
*trans
,
1316 struct btrfs_root
*root
,
1317 u64 objectid
, u64 dirid
)
1321 struct btrfs_key key
;
1326 key
.objectid
= objectid
;
1329 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1331 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 1, objectid
,
1332 &key
, BTRFS_FT_DIR
);
1335 key
.objectid
= dirid
;
1336 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 2, objectid
,
1337 &key
, BTRFS_FT_DIR
);
1344 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1346 struct inode
*inode
;
1347 struct btrfs_trans_handle
*trans
;
1348 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1350 int drop_on_err
= 0;
1352 unsigned long nr
= 1;
1354 mutex_lock(&root
->fs_info
->fs_mutex
);
1355 trans
= btrfs_start_transaction(root
, 1);
1356 btrfs_set_trans_block_group(trans
, dir
);
1357 if (IS_ERR(trans
)) {
1358 err
= PTR_ERR(trans
);
1362 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1368 inode
= btrfs_new_inode(trans
, root
, objectid
,
1369 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1370 if (IS_ERR(inode
)) {
1371 err
= PTR_ERR(inode
);
1375 inode
->i_op
= &btrfs_dir_inode_operations
;
1376 inode
->i_fop
= &btrfs_dir_file_operations
;
1377 btrfs_set_trans_block_group(trans
, inode
);
1379 err
= btrfs_make_empty_dir(trans
, root
, inode
->i_ino
, dir
->i_ino
);
1384 err
= btrfs_update_inode(trans
, root
, inode
);
1387 err
= btrfs_add_link(trans
, dentry
, inode
);
1390 d_instantiate(dentry
, inode
);
1392 dir
->i_sb
->s_dirt
= 1;
1393 btrfs_update_inode_block_group(trans
, inode
);
1394 btrfs_update_inode_block_group(trans
, dir
);
1397 nr
= trans
->blocks_used
;
1398 btrfs_end_transaction(trans
, root
);
1400 mutex_unlock(&root
->fs_info
->fs_mutex
);
1403 btrfs_btree_balance_dirty(root
, nr
);
1407 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1408 size_t page_offset
, u64 start
, u64 end
,
1414 u64 extent_start
= 0;
1416 u64 objectid
= inode
->i_ino
;
1418 int failed_insert
= 0;
1419 struct btrfs_path
*path
;
1420 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1421 struct btrfs_file_extent_item
*item
;
1422 struct btrfs_leaf
*leaf
;
1423 struct btrfs_disk_key
*found_key
;
1424 struct extent_map
*em
= NULL
;
1425 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1426 struct btrfs_trans_handle
*trans
= NULL
;
1428 path
= btrfs_alloc_path();
1430 mutex_lock(&root
->fs_info
->fs_mutex
);
1433 em
= lookup_extent_mapping(em_tree
, start
, end
);
1438 em
= alloc_extent_map(GFP_NOFS
);
1446 em
->bdev
= inode
->i_sb
->s_bdev
;
1447 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
1448 objectid
, start
, 0);
1455 if (path
->slots
[0] == 0)
1460 item
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]), path
->slots
[0],
1461 struct btrfs_file_extent_item
);
1462 leaf
= btrfs_buffer_leaf(path
->nodes
[0]);
1463 blocknr
= btrfs_file_extent_disk_blocknr(item
);
1464 blocknr
+= btrfs_file_extent_offset(item
);
1466 /* are we inside the extent that was found? */
1467 found_key
= &leaf
->items
[path
->slots
[0]].key
;
1468 found_type
= btrfs_disk_key_type(found_key
);
1469 if (btrfs_disk_key_objectid(found_key
) != objectid
||
1470 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1474 found_type
= btrfs_file_extent_type(item
);
1475 extent_start
= btrfs_disk_key_offset(&leaf
->items
[path
->slots
[0]].key
);
1476 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1477 extent_end
= extent_start
+
1478 (btrfs_file_extent_num_blocks(item
) << inode
->i_blkbits
);
1480 if (start
< extent_start
|| start
>= extent_end
) {
1482 if (start
< extent_start
) {
1483 if (end
< extent_start
)
1485 em
->end
= extent_end
- 1;
1491 if (btrfs_file_extent_disk_blocknr(item
) == 0) {
1492 em
->start
= extent_start
;
1493 em
->end
= extent_end
- 1;
1494 em
->block_start
= 0;
1498 em
->block_start
= blocknr
<< inode
->i_blkbits
;
1499 em
->block_end
= em
->block_start
+
1500 (btrfs_file_extent_num_blocks(item
) <<
1501 inode
->i_blkbits
) - 1;
1502 em
->start
= extent_start
;
1503 em
->end
= extent_end
- 1;
1505 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1510 size
= btrfs_file_extent_inline_len(leaf
->items
+
1512 extent_end
= extent_start
+ size
;
1513 if (start
< extent_start
|| start
>= extent_end
) {
1515 if (start
< extent_start
) {
1516 if (end
< extent_start
)
1518 em
->end
= extent_end
- 1;
1524 em
->block_start
= EXTENT_MAP_INLINE
;
1525 em
->block_end
= EXTENT_MAP_INLINE
;
1526 em
->start
= extent_start
;
1527 em
->end
= extent_end
- 1;
1531 ptr
= btrfs_file_extent_inline_start(item
);
1533 memcpy(map
+ page_offset
, ptr
, size
);
1534 flush_dcache_page(result
->b_page
);
1536 set_extent_uptodate(em_tree
, extent_start
,
1537 extent_end
, GFP_NOFS
);
1540 printk("unkknown found_type %d\n", found_type
);
1547 em
->block_start
= 0;
1550 btrfs_release_path(root
, path
);
1551 if (em
->start
> start
|| em
->end
< start
) {
1552 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->end
, start
, end
);
1556 ret
= add_extent_mapping(em_tree
, em
);
1557 if (ret
== -EEXIST
) {
1558 free_extent_map(em
);
1561 if (failed_insert
> 5) {
1562 printk("failing to insert %Lu %Lu\n", start
, end
);
1570 btrfs_free_path(path
);
1572 ret
= btrfs_end_transaction(trans
, root
);
1576 mutex_unlock(&root
->fs_info
->fs_mutex
);
1578 free_extent_map(em
);
1580 return ERR_PTR(err
);
1585 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
1587 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
1590 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1591 unsigned from
, unsigned to
)
1593 return extent_prepare_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1594 page
->mapping
->host
, page
, from
, to
,
1598 int btrfs_readpage(struct file
*file
, struct page
*page
)
1600 struct extent_map_tree
*tree
;
1601 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1602 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
1604 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1606 struct extent_map_tree
*tree
;
1609 if (current
->flags
& PF_MEMALLOC
) {
1610 redirty_page_for_writepage(wbc
, page
);
1614 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1615 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
1618 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
1620 struct extent_map_tree
*tree
;
1623 if (page
->private != 1) {
1625 return try_to_free_buffers(page
);
1627 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1628 ret
= try_release_extent_mapping(tree
, page
);
1630 ClearPagePrivate(page
);
1631 set_page_private(page
, 0);
1632 page_cache_release(page
);
1637 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
1639 struct extent_map_tree
*tree
;
1641 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1642 extent_invalidatepage(tree
, page
, offset
);
1643 btrfs_releasepage(page
, GFP_NOFS
);
1647 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1648 * called from a page fault handler when a page is first dirtied. Hence we must
1649 * be careful to check for EOF conditions here. We set the page up correctly
1650 * for a written page which means we get ENOSPC checking when writing into
1651 * holes and correct delalloc and unwritten extent mapping on filesystems that
1652 * support these features.
1654 * We are not allowed to take the i_mutex here so we have to play games to
1655 * protect against truncate races as the page could now be beyond EOF. Because
1656 * vmtruncate() writes the inode size before removing pages, once we have the
1657 * page lock we can determine safely if the page is beyond EOF. If it is not
1658 * beyond EOF, then the page is guaranteed safe against truncation until we
1661 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
1663 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
1669 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
1671 wait_on_page_writeback(page
);
1672 size
= i_size_read(inode
);
1673 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
1675 if ((page
->mapping
!= inode
->i_mapping
) ||
1676 (page_start
> size
)) {
1677 /* page got truncated out from underneath us */
1681 /* page is wholly or partially inside EOF */
1682 if (page_start
+ PAGE_CACHE_SIZE
> size
)
1683 end
= size
& ~PAGE_CACHE_MASK
;
1685 end
= PAGE_CACHE_SIZE
;
1687 ret
= btrfs_cow_one_page(inode
, page
, end
);
1690 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
1695 static void btrfs_truncate(struct inode
*inode
)
1697 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1699 struct btrfs_trans_handle
*trans
;
1702 if (!S_ISREG(inode
->i_mode
))
1704 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1707 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1709 mutex_lock(&root
->fs_info
->fs_mutex
);
1710 trans
= btrfs_start_transaction(root
, 1);
1711 btrfs_set_trans_block_group(trans
, inode
);
1713 /* FIXME, add redo link to tree so we don't leak on crash */
1714 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1715 btrfs_update_inode(trans
, root
, inode
);
1716 nr
= trans
->blocks_used
;
1717 ret
= btrfs_end_transaction(trans
, root
);
1719 mutex_unlock(&root
->fs_info
->fs_mutex
);
1720 btrfs_btree_balance_dirty(root
, nr
);
1723 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1724 unsigned from
, unsigned to
)
1726 return extent_commit_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1727 page
->mapping
->host
, page
, from
, to
);
1730 static int create_subvol(struct btrfs_root
*root
, char *name
, int namelen
)
1732 struct btrfs_trans_handle
*trans
;
1733 struct btrfs_key key
;
1734 struct btrfs_root_item root_item
;
1735 struct btrfs_inode_item
*inode_item
;
1736 struct buffer_head
*subvol
;
1737 struct btrfs_leaf
*leaf
;
1738 struct btrfs_root
*new_root
;
1739 struct inode
*inode
;
1744 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
1745 unsigned long nr
= 1;
1747 mutex_lock(&root
->fs_info
->fs_mutex
);
1748 trans
= btrfs_start_transaction(root
, 1);
1751 subvol
= btrfs_alloc_free_block(trans
, root
, 0, 0);
1753 return PTR_ERR(subvol
);
1754 leaf
= btrfs_buffer_leaf(subvol
);
1755 btrfs_set_header_nritems(&leaf
->header
, 0);
1756 btrfs_set_header_level(&leaf
->header
, 0);
1757 btrfs_set_header_blocknr(&leaf
->header
, bh_blocknr(subvol
));
1758 btrfs_set_header_generation(&leaf
->header
, trans
->transid
);
1759 btrfs_set_header_owner(&leaf
->header
, root
->root_key
.objectid
);
1760 memcpy(leaf
->header
.fsid
, root
->fs_info
->disk_super
->fsid
,
1761 sizeof(leaf
->header
.fsid
));
1762 btrfs_mark_buffer_dirty(subvol
);
1764 inode_item
= &root_item
.inode
;
1765 memset(inode_item
, 0, sizeof(*inode_item
));
1766 btrfs_set_inode_generation(inode_item
, 1);
1767 btrfs_set_inode_size(inode_item
, 3);
1768 btrfs_set_inode_nlink(inode_item
, 1);
1769 btrfs_set_inode_nblocks(inode_item
, 1);
1770 btrfs_set_inode_mode(inode_item
, S_IFDIR
| 0755);
1772 btrfs_set_root_blocknr(&root_item
, bh_blocknr(subvol
));
1773 btrfs_set_root_refs(&root_item
, 1);
1774 btrfs_set_root_blocks_used(&root_item
, 0);
1775 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
1776 root_item
.drop_level
= 0;
1780 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1785 btrfs_set_root_dirid(&root_item
, new_dirid
);
1787 key
.objectid
= objectid
;
1790 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1791 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1797 * insert the directory item
1799 key
.offset
= (u64
)-1;
1800 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
1801 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1802 name
, namelen
, dir
->i_ino
, &key
,
1807 ret
= btrfs_commit_transaction(trans
, root
);
1811 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
1814 trans
= btrfs_start_transaction(new_root
, 1);
1817 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
1818 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
1821 inode
->i_op
= &btrfs_dir_inode_operations
;
1822 inode
->i_fop
= &btrfs_dir_file_operations
;
1823 new_root
->inode
= inode
;
1825 ret
= btrfs_make_empty_dir(trans
, new_root
, new_dirid
, new_dirid
);
1831 ret
= btrfs_update_inode(trans
, new_root
, inode
);
1835 nr
= trans
->blocks_used
;
1836 err
= btrfs_commit_transaction(trans
, root
);
1840 mutex_unlock(&root
->fs_info
->fs_mutex
);
1841 btrfs_btree_balance_dirty(root
, nr
);
1845 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
1847 struct btrfs_trans_handle
*trans
;
1848 struct btrfs_key key
;
1849 struct btrfs_root_item new_root_item
;
1850 struct buffer_head
*tmp
;
1856 if (!root
->ref_cows
)
1859 down_write(&root
->snap_sem
);
1860 freeze_bdev(root
->fs_info
->sb
->s_bdev
);
1861 thaw_bdev(root
->fs_info
->sb
->s_bdev
, root
->fs_info
->sb
);
1863 mutex_lock(&root
->fs_info
->fs_mutex
);
1864 trans
= btrfs_start_transaction(root
, 1);
1867 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
1871 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1876 memcpy(&new_root_item
, &root
->root_item
,
1877 sizeof(new_root_item
));
1879 key
.objectid
= objectid
;
1882 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1883 btrfs_cow_block(trans
, root
, root
->node
, NULL
, 0, &tmp
);
1884 btrfs_set_root_blocknr(&new_root_item
, bh_blocknr(root
->node
));
1886 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1892 * insert the directory item
1894 key
.offset
= (u64
)-1;
1895 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1897 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
1898 &key
, BTRFS_FT_DIR
);
1903 ret
= btrfs_inc_root_ref(trans
, root
);
1907 nr
= trans
->blocks_used
;
1908 err
= btrfs_commit_transaction(trans
, root
);
1911 mutex_unlock(&root
->fs_info
->fs_mutex
);
1912 up_write(&root
->snap_sem
);
1913 btrfs_btree_balance_dirty(root
, nr
);
1917 static unsigned long force_ra(struct address_space
*mapping
,
1918 struct file_ra_state
*ra
, struct file
*file
,
1919 pgoff_t offset
, pgoff_t last_index
)
1923 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
1924 req_size
= last_index
- offset
+ 1;
1925 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
1928 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
1929 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
1930 return offset
+ req_size
;
1934 int btrfs_defrag_file(struct file
*file
) {
1935 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
1936 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1938 unsigned long last_index
;
1939 unsigned long ra_index
= 0;
1944 mutex_lock(&inode
->i_mutex
);
1945 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
1946 for (i
= 0; i
<= last_index
; i
++) {
1947 if (i
== ra_index
) {
1948 ra_index
= force_ra(inode
->i_mapping
, &file
->f_ra
,
1949 file
, ra_index
, last_index
);
1951 page
= grab_cache_page(inode
->i_mapping
, i
);
1954 if (!PageUptodate(page
)) {
1955 btrfs_readpage(NULL
, page
);
1957 if (!PageUptodate(page
)) {
1959 page_cache_release(page
);
1963 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
1964 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
1966 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
1967 set_extent_delalloc(em_tree
, page_start
,
1968 page_end
, GFP_NOFS
);
1969 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
1970 set_page_dirty(page
);
1972 page_cache_release(page
);
1973 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
1977 mutex_unlock(&inode
->i_mutex
);
1981 static int btrfs_ioctl_snap_create(struct btrfs_root
*root
, void __user
*arg
)
1983 struct btrfs_ioctl_vol_args vol_args
;
1984 struct btrfs_dir_item
*di
;
1985 struct btrfs_path
*path
;
1989 if (copy_from_user(&vol_args
, arg
, sizeof(vol_args
)))
1992 namelen
= strlen(vol_args
.name
);
1993 if (namelen
> BTRFS_VOL_NAME_MAX
)
1995 if (strchr(vol_args
.name
, '/'))
1998 path
= btrfs_alloc_path();
2002 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2003 mutex_lock(&root
->fs_info
->fs_mutex
);
2004 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2006 vol_args
.name
, namelen
, 0);
2007 mutex_unlock(&root
->fs_info
->fs_mutex
);
2008 btrfs_free_path(path
);
2009 if (di
&& !IS_ERR(di
))
2014 if (root
== root
->fs_info
->tree_root
)
2015 return create_subvol(root
, vol_args
.name
, namelen
);
2016 return create_snapshot(root
, vol_args
.name
, namelen
);
2019 static int btrfs_ioctl_defrag(struct file
*file
)
2021 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2022 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2024 switch (inode
->i_mode
& S_IFMT
) {
2026 mutex_lock(&root
->fs_info
->fs_mutex
);
2027 btrfs_defrag_root(root
, 0);
2028 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2029 mutex_unlock(&root
->fs_info
->fs_mutex
);
2032 btrfs_defrag_file(file
);
2039 long btrfs_ioctl(struct file
*file
, unsigned int
2040 cmd
, unsigned long arg
)
2042 struct btrfs_root
*root
= BTRFS_I(file
->f_path
.dentry
->d_inode
)->root
;
2045 case BTRFS_IOC_SNAP_CREATE
:
2046 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2047 case BTRFS_IOC_DEFRAG
:
2048 return btrfs_ioctl_defrag(file
);
2055 * Called inside transaction, so use GFP_NOFS
2057 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2059 struct btrfs_inode
*ei
;
2061 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2065 return &ei
->vfs_inode
;
2068 void btrfs_destroy_inode(struct inode
*inode
)
2070 WARN_ON(!list_empty(&inode
->i_dentry
));
2071 WARN_ON(inode
->i_data
.nrpages
);
2073 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2076 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2077 unsigned long flags
)
2079 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2081 inode_init_once(&ei
->vfs_inode
);
2084 void btrfs_destroy_cachep(void)
2086 if (btrfs_inode_cachep
)
2087 kmem_cache_destroy(btrfs_inode_cachep
);
2088 if (btrfs_trans_handle_cachep
)
2089 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2090 if (btrfs_transaction_cachep
)
2091 kmem_cache_destroy(btrfs_transaction_cachep
);
2092 if (btrfs_bit_radix_cachep
)
2093 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2094 if (btrfs_path_cachep
)
2095 kmem_cache_destroy(btrfs_path_cachep
);
2098 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2099 unsigned long extra_flags
,
2100 void (*ctor
)(void *, struct kmem_cache
*,
2103 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2104 SLAB_MEM_SPREAD
| extra_flags
), ctor
2105 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2111 int btrfs_init_cachep(void)
2113 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2114 sizeof(struct btrfs_inode
),
2116 if (!btrfs_inode_cachep
)
2118 btrfs_trans_handle_cachep
=
2119 btrfs_cache_create("btrfs_trans_handle_cache",
2120 sizeof(struct btrfs_trans_handle
),
2122 if (!btrfs_trans_handle_cachep
)
2124 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2125 sizeof(struct btrfs_transaction
),
2127 if (!btrfs_transaction_cachep
)
2129 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2130 sizeof(struct btrfs_path
),
2132 if (!btrfs_path_cachep
)
2134 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2135 SLAB_DESTROY_BY_RCU
, NULL
);
2136 if (!btrfs_bit_radix_cachep
)
2140 btrfs_destroy_cachep();
2144 static int btrfs_getattr(struct vfsmount
*mnt
,
2145 struct dentry
*dentry
, struct kstat
*stat
)
2147 struct inode
*inode
= dentry
->d_inode
;
2148 generic_fillattr(inode
, stat
);
2149 stat
->blksize
= 256 * 1024;
2153 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2154 struct inode
* new_dir
,struct dentry
*new_dentry
)
2156 struct btrfs_trans_handle
*trans
;
2157 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2158 struct inode
*new_inode
= new_dentry
->d_inode
;
2159 struct inode
*old_inode
= old_dentry
->d_inode
;
2160 struct timespec ctime
= CURRENT_TIME
;
2161 struct btrfs_path
*path
;
2162 struct btrfs_dir_item
*di
;
2165 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2166 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2169 mutex_lock(&root
->fs_info
->fs_mutex
);
2170 trans
= btrfs_start_transaction(root
, 1);
2171 btrfs_set_trans_block_group(trans
, new_dir
);
2172 path
= btrfs_alloc_path();
2178 old_dentry
->d_inode
->i_nlink
++;
2179 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2180 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2181 old_inode
->i_ctime
= ctime
;
2182 if (S_ISDIR(old_inode
->i_mode
) && old_dir
!= new_dir
) {
2183 struct btrfs_key
*location
= &BTRFS_I(new_dir
)->location
;
2185 di
= btrfs_lookup_dir_item(trans
, root
, path
, old_inode
->i_ino
,
2195 old_parent_oid
= btrfs_disk_key_objectid(&di
->location
);
2196 ret
= btrfs_del_item(trans
, root
, path
);
2200 btrfs_release_path(root
, path
);
2202 di
= btrfs_lookup_dir_index_item(trans
, root
, path
,
2214 ret
= btrfs_del_item(trans
, root
, path
);
2218 btrfs_release_path(root
, path
);
2220 ret
= btrfs_insert_dir_item(trans
, root
, "..", 2,
2221 old_inode
->i_ino
, location
,
2228 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2233 new_inode
->i_ctime
= CURRENT_TIME
;
2234 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2238 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2243 btrfs_free_path(path
);
2244 btrfs_end_transaction(trans
, root
);
2245 mutex_unlock(&root
->fs_info
->fs_mutex
);
2249 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2250 const char *symname
)
2252 struct btrfs_trans_handle
*trans
;
2253 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2254 struct btrfs_path
*path
;
2255 struct btrfs_key key
;
2256 struct inode
*inode
;
2263 struct btrfs_file_extent_item
*ei
;
2266 name_len
= strlen(symname
) + 1;
2267 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2268 return -ENAMETOOLONG
;
2269 mutex_lock(&root
->fs_info
->fs_mutex
);
2270 trans
= btrfs_start_transaction(root
, 1);
2271 btrfs_set_trans_block_group(trans
, dir
);
2273 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2279 inode
= btrfs_new_inode(trans
, root
, objectid
,
2280 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2281 err
= PTR_ERR(inode
);
2285 btrfs_set_trans_block_group(trans
, inode
);
2286 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2290 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2291 inode
->i_fop
= &btrfs_file_operations
;
2292 inode
->i_op
= &btrfs_file_inode_operations
;
2293 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
2294 inode
->i_mapping
, GFP_NOFS
);
2295 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
2297 dir
->i_sb
->s_dirt
= 1;
2298 btrfs_update_inode_block_group(trans
, inode
);
2299 btrfs_update_inode_block_group(trans
, dir
);
2303 path
= btrfs_alloc_path();
2305 key
.objectid
= inode
->i_ino
;
2308 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2309 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2310 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2316 ei
= btrfs_item_ptr(btrfs_buffer_leaf(path
->nodes
[0]),
2317 path
->slots
[0], struct btrfs_file_extent_item
);
2318 btrfs_set_file_extent_generation(ei
, trans
->transid
);
2319 btrfs_set_file_extent_type(ei
,
2320 BTRFS_FILE_EXTENT_INLINE
);
2321 ptr
= btrfs_file_extent_inline_start(ei
);
2322 btrfs_memcpy(root
, path
->nodes
[0]->b_data
,
2323 ptr
, symname
, name_len
);
2324 btrfs_mark_buffer_dirty(path
->nodes
[0]);
2325 btrfs_free_path(path
);
2326 inode
->i_op
= &btrfs_symlink_inode_operations
;
2327 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2328 inode
->i_size
= name_len
- 1;
2329 err
= btrfs_update_inode(trans
, root
, inode
);
2334 nr
= trans
->blocks_used
;
2335 btrfs_end_transaction(trans
, root
);
2336 mutex_unlock(&root
->fs_info
->fs_mutex
);
2338 inode_dec_link_count(inode
);
2341 btrfs_btree_balance_dirty(root
, nr
);
2345 static struct inode_operations btrfs_dir_inode_operations
= {
2346 .lookup
= btrfs_lookup
,
2347 .create
= btrfs_create
,
2348 .unlink
= btrfs_unlink
,
2350 .mkdir
= btrfs_mkdir
,
2351 .rmdir
= btrfs_rmdir
,
2352 .rename
= btrfs_rename
,
2353 .symlink
= btrfs_symlink
,
2354 .setattr
= btrfs_setattr
,
2355 .mknod
= btrfs_mknod
,
2358 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2359 .lookup
= btrfs_lookup
,
2362 static struct file_operations btrfs_dir_file_operations
= {
2363 .llseek
= generic_file_llseek
,
2364 .read
= generic_read_dir
,
2365 .readdir
= btrfs_readdir
,
2366 .unlocked_ioctl
= btrfs_ioctl
,
2367 #ifdef CONFIG_COMPAT
2368 .compat_ioctl
= btrfs_ioctl
,
2372 static struct extent_map_ops btrfs_extent_map_ops
= {
2373 .fill_delalloc
= run_delalloc_range
,
2374 .writepage_io_hook
= btrfs_writepage_io_hook
,
2375 .readpage_io_hook
= btrfs_readpage_io_hook
,
2376 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2379 static struct address_space_operations btrfs_aops
= {
2380 .readpage
= btrfs_readpage
,
2381 .writepage
= btrfs_writepage
,
2382 .sync_page
= block_sync_page
,
2383 .prepare_write
= btrfs_prepare_write
,
2384 .commit_write
= btrfs_commit_write
,
2386 .invalidatepage
= btrfs_invalidatepage
,
2387 .releasepage
= btrfs_releasepage
,
2388 .set_page_dirty
= __set_page_dirty_nobuffers
,
2391 static struct address_space_operations btrfs_symlink_aops
= {
2392 .readpage
= btrfs_readpage
,
2393 .writepage
= btrfs_writepage
,
2394 .invalidatepage
= btrfs_invalidatepage
,
2395 .releasepage
= btrfs_releasepage
,
2398 static struct inode_operations btrfs_file_inode_operations
= {
2399 .truncate
= btrfs_truncate
,
2400 .getattr
= btrfs_getattr
,
2401 .setattr
= btrfs_setattr
,
2404 static struct inode_operations btrfs_special_inode_operations
= {
2405 .getattr
= btrfs_getattr
,
2406 .setattr
= btrfs_setattr
,
2409 static struct inode_operations btrfs_symlink_inode_operations
= {
2410 .readlink
= generic_readlink
,
2411 .follow_link
= page_follow_link_light
,
2412 .put_link
= page_put_link
,