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
= root
->sectorsize
;
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_bytes
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
89 ret
= btrfs_drop_extents(trans
, root
, inode
,
90 start
, start
+ num_bytes
, &alloc_hint
);
92 ret
= btrfs_alloc_extent(trans
, root
, inode
->i_ino
, num_bytes
, 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 size_t offset
= start
- (page
->index
<< PAGE_CACHE_SHIFT
);
163 struct inode
*inode
= page
->mapping
->host
;
164 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
169 ret
= get_state_private(em_tree
, start
, &private);
170 kaddr
= kmap_atomic(page
, KM_IRQ0
);
175 struct btrfs_root *root = BTRFS_I(inode)->root;
176 char csum[BTRFS_CRC32_SIZE];
177 ret = btrfs_csum_data(root, kaddr + offset, end - start + 1, csum);
179 if (memcmp(csum, &private, BTRFS_CRC32_SIZE)) {
183 kunmap_atomic(kaddr
, KM_IRQ0
);
187 printk("btrfs csum failed ino %lu off %llu\n",
188 page
->mapping
->host
->i_ino
, (unsigned long long)start
);
189 memset(kaddr
+ offset
, 1, end
- start
+ 1);
190 flush_dcache_page(page
);
191 kunmap_atomic(kaddr
, KM_IRQ0
);
195 void btrfs_read_locked_inode(struct inode
*inode
)
197 struct btrfs_path
*path
;
198 struct extent_buffer
*leaf
;
199 struct btrfs_inode_item
*inode_item
;
200 struct btrfs_inode_timespec
*tspec
;
201 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
202 struct btrfs_key location
;
203 u64 alloc_group_block
;
207 path
= btrfs_alloc_path();
209 mutex_lock(&root
->fs_info
->fs_mutex
);
211 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
212 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
216 leaf
= path
->nodes
[0];
217 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
218 struct btrfs_inode_item
);
220 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
221 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
222 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
223 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
224 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
226 tspec
= btrfs_inode_atime(inode_item
);
227 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
228 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
230 tspec
= btrfs_inode_mtime(inode_item
);
231 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
232 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
234 tspec
= btrfs_inode_ctime(inode_item
);
235 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
236 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
238 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
239 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
241 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
243 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
244 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
247 btrfs_free_path(path
);
250 mutex_unlock(&root
->fs_info
->fs_mutex
);
252 switch (inode
->i_mode
& S_IFMT
) {
254 inode
->i_mapping
->a_ops
= &btrfs_aops
;
255 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
256 inode
->i_fop
= &btrfs_file_operations
;
257 inode
->i_op
= &btrfs_file_inode_operations
;
260 inode
->i_fop
= &btrfs_dir_file_operations
;
261 if (root
== root
->fs_info
->tree_root
)
262 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
264 inode
->i_op
= &btrfs_dir_inode_operations
;
267 inode
->i_op
= &btrfs_symlink_inode_operations
;
268 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
271 init_special_inode(inode
, inode
->i_mode
, rdev
);
277 btrfs_release_path(root
, path
);
278 btrfs_free_path(path
);
279 mutex_unlock(&root
->fs_info
->fs_mutex
);
280 make_bad_inode(inode
);
283 static void fill_inode_item(struct extent_buffer
*leaf
,
284 struct btrfs_inode_item
*item
,
287 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
288 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
289 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
290 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
291 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
293 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
294 inode
->i_atime
.tv_sec
);
295 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
296 inode
->i_atime
.tv_nsec
);
298 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
299 inode
->i_mtime
.tv_sec
);
300 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
301 inode
->i_mtime
.tv_nsec
);
303 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
304 inode
->i_ctime
.tv_sec
);
305 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
306 inode
->i_ctime
.tv_nsec
);
308 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
309 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
310 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
311 btrfs_set_inode_block_group(leaf
, item
,
312 BTRFS_I(inode
)->block_group
->key
.objectid
);
315 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
316 struct btrfs_root
*root
,
319 struct btrfs_inode_item
*inode_item
;
320 struct btrfs_path
*path
;
321 struct extent_buffer
*leaf
;
324 path
= btrfs_alloc_path();
326 ret
= btrfs_lookup_inode(trans
, root
, path
,
327 &BTRFS_I(inode
)->location
, 1);
334 leaf
= path
->nodes
[0];
335 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
336 struct btrfs_inode_item
);
338 fill_inode_item(leaf
, inode_item
, inode
);
339 btrfs_mark_buffer_dirty(leaf
);
340 btrfs_set_inode_last_trans(trans
, inode
);
343 btrfs_release_path(root
, path
);
344 btrfs_free_path(path
);
349 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
350 struct btrfs_root
*root
,
352 struct dentry
*dentry
)
354 struct btrfs_path
*path
;
355 const char *name
= dentry
->d_name
.name
;
356 int name_len
= dentry
->d_name
.len
;
358 struct extent_buffer
*leaf
;
359 struct btrfs_dir_item
*di
;
360 struct btrfs_key key
;
362 path
= btrfs_alloc_path();
368 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
378 leaf
= path
->nodes
[0];
379 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
380 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
383 btrfs_release_path(root
, path
);
385 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
386 key
.objectid
, name
, name_len
, -1);
395 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
397 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
399 btrfs_free_path(path
);
401 dir
->i_size
-= name_len
* 2;
402 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
403 btrfs_update_inode(trans
, root
, dir
);
404 drop_nlink(dentry
->d_inode
);
405 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
406 dir
->i_sb
->s_dirt
= 1;
411 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
413 struct btrfs_root
*root
;
414 struct btrfs_trans_handle
*trans
;
418 root
= BTRFS_I(dir
)->root
;
419 mutex_lock(&root
->fs_info
->fs_mutex
);
420 trans
= btrfs_start_transaction(root
, 1);
422 btrfs_set_trans_block_group(trans
, dir
);
423 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
424 nr
= trans
->blocks_used
;
426 btrfs_end_transaction(trans
, root
);
427 mutex_unlock(&root
->fs_info
->fs_mutex
);
428 btrfs_btree_balance_dirty(root
, nr
);
433 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
435 struct inode
*inode
= dentry
->d_inode
;
438 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
439 struct btrfs_path
*path
;
440 struct btrfs_key key
;
441 struct btrfs_trans_handle
*trans
;
442 struct btrfs_key found_key
;
444 struct extent_buffer
*leaf
;
445 char *goodnames
= "..";
448 path
= btrfs_alloc_path();
450 mutex_lock(&root
->fs_info
->fs_mutex
);
451 trans
= btrfs_start_transaction(root
, 1);
453 btrfs_set_trans_block_group(trans
, dir
);
454 key
.objectid
= inode
->i_ino
;
455 key
.offset
= (u64
)-1;
458 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
464 if (path
->slots
[0] == 0) {
469 leaf
= path
->nodes
[0];
470 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
471 found_type
= btrfs_key_type(&found_key
);
472 if (found_key
.objectid
!= inode
->i_ino
) {
476 if ((found_type
!= BTRFS_DIR_ITEM_KEY
&&
477 found_type
!= BTRFS_DIR_INDEX_KEY
) ||
478 (!btrfs_match_dir_item_name(root
, path
, goodnames
, 2) &&
479 !btrfs_match_dir_item_name(root
, path
, goodnames
, 1))) {
483 ret
= btrfs_del_item(trans
, root
, path
);
486 if (found_type
== BTRFS_DIR_ITEM_KEY
&& found_key
.offset
== 1)
488 btrfs_release_path(root
, path
);
491 btrfs_release_path(root
, path
);
493 /* now the directory is empty */
494 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
499 btrfs_release_path(root
, path
);
500 btrfs_free_path(path
);
501 mutex_unlock(&root
->fs_info
->fs_mutex
);
502 nr
= trans
->blocks_used
;
503 ret
= btrfs_end_transaction(trans
, root
);
504 btrfs_btree_balance_dirty(root
, nr
);
510 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
511 struct btrfs_root
*root
,
514 struct btrfs_path
*path
;
519 path
= btrfs_alloc_path();
521 ret
= btrfs_lookup_inode(trans
, root
, path
,
522 &BTRFS_I(inode
)->location
, -1);
526 ret
= btrfs_del_item(trans
, root
, path
);
527 btrfs_free_path(path
);
532 * this can truncate away extent items, csum items and directory items.
533 * It starts at a high offset and removes keys until it can't find
534 * any higher than i_size.
536 * csum items that cross the new i_size are truncated to the new size
539 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
540 struct btrfs_root
*root
,
544 struct btrfs_path
*path
;
545 struct btrfs_key key
;
546 struct btrfs_key found_key
;
548 struct extent_buffer
*leaf
;
549 struct btrfs_file_extent_item
*fi
;
550 u64 extent_start
= 0;
551 u64 extent_num_bytes
= 0;
556 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
557 path
= btrfs_alloc_path();
561 /* FIXME, add redo link to tree so we don't leak on crash */
562 key
.objectid
= inode
->i_ino
;
563 key
.offset
= (u64
)-1;
567 btrfs_init_path(path
);
569 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
574 BUG_ON(path
->slots
[0] == 0);
577 leaf
= path
->nodes
[0];
578 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
579 found_type
= btrfs_key_type(&found_key
);
581 if (found_key
.objectid
!= inode
->i_ino
)
584 if (found_type
!= BTRFS_CSUM_ITEM_KEY
&&
585 found_type
!= BTRFS_DIR_ITEM_KEY
&&
586 found_type
!= BTRFS_DIR_INDEX_KEY
&&
587 found_type
!= BTRFS_EXTENT_DATA_KEY
)
590 item_end
= found_key
.offset
;
591 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
592 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
593 struct btrfs_file_extent_item
);
594 if (btrfs_file_extent_type(leaf
, fi
) !=
595 BTRFS_FILE_EXTENT_INLINE
) {
597 btrfs_file_extent_num_bytes(leaf
, fi
);
600 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
601 ret
= btrfs_csum_truncate(trans
, root
, path
,
605 if (item_end
< inode
->i_size
) {
606 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
607 found_type
= BTRFS_INODE_ITEM_KEY
;
608 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
609 found_type
= BTRFS_CSUM_ITEM_KEY
;
610 } else if (found_type
) {
615 btrfs_set_key_type(&key
, found_type
);
618 if (found_key
.offset
>= inode
->i_size
)
624 /* FIXME, shrink the extent if the ref count is only 1 */
625 if (found_type
== BTRFS_EXTENT_DATA_KEY
&&
626 btrfs_file_extent_type(leaf
, fi
) !=
627 BTRFS_FILE_EXTENT_INLINE
) {
629 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
632 btrfs_file_extent_num_bytes(leaf
, fi
);
633 extent_num_bytes
= inode
->i_size
-
634 found_key
.offset
+ root
->sectorsize
- 1;
635 btrfs_set_file_extent_num_bytes(leaf
, fi
,
637 num_dec
= (orig_num_bytes
-
638 extent_num_bytes
) >> 9;
639 if (extent_start
!= 0) {
640 inode
->i_blocks
-= num_dec
;
642 btrfs_mark_buffer_dirty(leaf
);
645 btrfs_file_extent_disk_num_bytes(leaf
,
647 /* FIXME blocksize != 4096 */
648 num_dec
= btrfs_file_extent_num_bytes(leaf
,
650 if (extent_start
!= 0) {
652 inode
->i_blocks
-= num_dec
;
657 ret
= btrfs_del_item(trans
, root
, path
);
663 btrfs_release_path(root
, path
);
665 ret
= btrfs_free_extent(trans
, root
, extent_start
,
666 extent_num_bytes
, 0);
672 btrfs_release_path(root
, path
);
673 btrfs_free_path(path
);
674 inode
->i_sb
->s_dirt
= 1;
678 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
683 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
684 u64 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
685 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
687 set_page_extent_mapped(page
);
689 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
690 set_extent_delalloc(&BTRFS_I(inode
)->extent_tree
, page_start
,
692 if (zero_start
!= PAGE_CACHE_SIZE
) {
694 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
695 flush_dcache_page(page
);
698 set_page_dirty(page
);
699 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
705 * taken from block_truncate_page, but does cow as it zeros out
706 * any bytes left in the last page in the file.
708 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
710 struct inode
*inode
= mapping
->host
;
711 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
712 u32 blocksize
= root
->sectorsize
;
713 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
714 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
719 if ((offset
& (blocksize
- 1)) == 0)
722 down_read(&root
->snap_sem
);
724 page
= grab_cache_page(mapping
, index
);
727 if (!PageUptodate(page
)) {
728 ret
= btrfs_readpage(NULL
, page
);
730 if (!PageUptodate(page
)) {
735 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
737 ret
= btrfs_cow_one_page(inode
, page
, offset
);
740 page_cache_release(page
);
741 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
746 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
748 struct inode
*inode
= dentry
->d_inode
;
751 err
= inode_change_ok(inode
, attr
);
755 if (S_ISREG(inode
->i_mode
) &&
756 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
757 struct btrfs_trans_handle
*trans
;
758 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
759 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
761 u64 mask
= root
->sectorsize
- 1;
762 u64 pos
= (inode
->i_size
+ mask
) & ~mask
;
763 u64 block_end
= attr
->ia_size
| mask
;
767 if (attr
->ia_size
<= pos
)
770 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
772 lock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
773 hole_size
= (attr
->ia_size
- pos
+ mask
) & ~mask
;
775 mutex_lock(&root
->fs_info
->fs_mutex
);
776 trans
= btrfs_start_transaction(root
, 1);
777 btrfs_set_trans_block_group(trans
, inode
);
778 err
= btrfs_drop_extents(trans
, root
, inode
,
779 pos
, pos
+ hole_size
, &alloc_hint
);
781 err
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
782 pos
, 0, 0, hole_size
);
783 btrfs_end_transaction(trans
, root
);
784 mutex_unlock(&root
->fs_info
->fs_mutex
);
785 unlock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
790 err
= inode_setattr(inode
, attr
);
794 void btrfs_delete_inode(struct inode
*inode
)
796 struct btrfs_trans_handle
*trans
;
797 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
801 truncate_inode_pages(&inode
->i_data
, 0);
802 if (is_bad_inode(inode
)) {
807 mutex_lock(&root
->fs_info
->fs_mutex
);
808 trans
= btrfs_start_transaction(root
, 1);
810 btrfs_set_trans_block_group(trans
, inode
);
811 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
814 ret
= btrfs_free_inode(trans
, root
, inode
);
817 nr
= trans
->blocks_used
;
819 btrfs_end_transaction(trans
, root
);
820 mutex_unlock(&root
->fs_info
->fs_mutex
);
821 btrfs_btree_balance_dirty(root
, nr
);
825 nr
= trans
->blocks_used
;
826 btrfs_end_transaction(trans
, root
);
827 mutex_unlock(&root
->fs_info
->fs_mutex
);
828 btrfs_btree_balance_dirty(root
, nr
);
834 * this returns the key found in the dir entry in the location pointer.
835 * If no dir entries were found, location->objectid is 0.
837 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
838 struct btrfs_key
*location
)
840 const char *name
= dentry
->d_name
.name
;
841 int namelen
= dentry
->d_name
.len
;
842 struct btrfs_dir_item
*di
;
843 struct btrfs_path
*path
;
844 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
847 path
= btrfs_alloc_path();
849 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
851 if (!di
|| IS_ERR(di
)) {
852 location
->objectid
= 0;
856 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
858 btrfs_release_path(root
, path
);
859 btrfs_free_path(path
);
864 * when we hit a tree root in a directory, the btrfs part of the inode
865 * needs to be changed to reflect the root directory of the tree root. This
866 * is kind of like crossing a mount point.
868 static int fixup_tree_root_location(struct btrfs_root
*root
,
869 struct btrfs_key
*location
,
870 struct btrfs_root
**sub_root
,
871 struct dentry
*dentry
)
873 struct btrfs_path
*path
;
874 struct btrfs_root_item
*ri
;
876 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
878 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
881 path
= btrfs_alloc_path();
883 mutex_lock(&root
->fs_info
->fs_mutex
);
885 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
888 if (IS_ERR(*sub_root
))
889 return PTR_ERR(*sub_root
);
891 ri
= &(*sub_root
)->root_item
;
892 location
->objectid
= btrfs_root_dirid(ri
);
893 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
894 location
->offset
= 0;
896 btrfs_free_path(path
);
897 mutex_unlock(&root
->fs_info
->fs_mutex
);
901 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
903 struct btrfs_iget_args
*args
= p
;
904 inode
->i_ino
= args
->ino
;
905 BTRFS_I(inode
)->root
= args
->root
;
906 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
907 inode
->i_mapping
, GFP_NOFS
);
911 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
913 struct btrfs_iget_args
*args
= opaque
;
914 return (args
->ino
== inode
->i_ino
&&
915 args
->root
== BTRFS_I(inode
)->root
);
918 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
919 struct btrfs_root
*root
)
922 struct btrfs_iget_args args
;
926 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
927 btrfs_init_locked_inode
,
932 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
933 struct nameidata
*nd
)
935 struct inode
* inode
;
936 struct btrfs_inode
*bi
= BTRFS_I(dir
);
937 struct btrfs_root
*root
= bi
->root
;
938 struct btrfs_root
*sub_root
= root
;
939 struct btrfs_key location
;
942 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
943 return ERR_PTR(-ENAMETOOLONG
);
945 mutex_lock(&root
->fs_info
->fs_mutex
);
946 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
947 mutex_unlock(&root
->fs_info
->fs_mutex
);
953 if (location
.objectid
) {
954 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
959 return ERR_PTR(-ENOENT
);
960 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
963 return ERR_PTR(-EACCES
);
964 if (inode
->i_state
& I_NEW
) {
965 /* the inode and parent dir are two different roots */
966 if (sub_root
!= root
) {
968 sub_root
->inode
= inode
;
970 BTRFS_I(inode
)->root
= sub_root
;
971 memcpy(&BTRFS_I(inode
)->location
, &location
,
973 btrfs_read_locked_inode(inode
);
974 unlock_new_inode(inode
);
977 return d_splice_alias(inode
, dentry
);
980 static unsigned char btrfs_filetype_table
[] = {
981 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
984 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
986 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
987 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
988 struct btrfs_item
*item
;
989 struct btrfs_dir_item
*di
;
990 struct btrfs_key key
;
991 struct btrfs_key found_key
;
992 struct btrfs_path
*path
;
995 struct extent_buffer
*leaf
;
998 unsigned char d_type
;
1003 int key_type
= BTRFS_DIR_INDEX_KEY
;
1008 /* FIXME, use a real flag for deciding about the key type */
1009 if (root
->fs_info
->tree_root
== root
)
1010 key_type
= BTRFS_DIR_ITEM_KEY
;
1012 mutex_lock(&root
->fs_info
->fs_mutex
);
1013 key
.objectid
= inode
->i_ino
;
1014 btrfs_set_key_type(&key
, key_type
);
1015 key
.offset
= filp
->f_pos
;
1017 path
= btrfs_alloc_path();
1019 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1024 leaf
= path
->nodes
[0];
1025 nritems
= btrfs_header_nritems(leaf
);
1026 slot
= path
->slots
[0];
1027 if (advance
|| slot
>= nritems
) {
1028 if (slot
>= nritems
-1) {
1029 ret
= btrfs_next_leaf(root
, path
);
1032 leaf
= path
->nodes
[0];
1033 nritems
= btrfs_header_nritems(leaf
);
1034 slot
= path
->slots
[0];
1041 item
= btrfs_item_nr(leaf
, slot
);
1042 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1044 if (found_key
.objectid
!= key
.objectid
)
1046 if (btrfs_key_type(&found_key
) != key_type
)
1048 if (found_key
.offset
< filp
->f_pos
)
1051 filp
->f_pos
= found_key
.offset
;
1053 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1055 di_total
= btrfs_item_size(leaf
, item
);
1056 while(di_cur
< di_total
) {
1057 struct btrfs_key location
;
1059 name_len
= btrfs_dir_name_len(leaf
, di
);
1060 if (name_len
< 32) {
1061 name_ptr
= tmp_name
;
1063 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1066 read_extent_buffer(leaf
, name_ptr
,
1067 (unsigned long)(di
+ 1), name_len
);
1069 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1070 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1072 over
= filldir(dirent
, name_ptr
, name_len
,
1077 if (name_ptr
!= tmp_name
)
1082 di_len
= btrfs_dir_name_len(leaf
, di
) + sizeof(*di
);
1084 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1091 btrfs_release_path(root
, path
);
1092 btrfs_free_path(path
);
1093 mutex_unlock(&root
->fs_info
->fs_mutex
);
1097 int btrfs_write_inode(struct inode
*inode
, int wait
)
1099 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1100 struct btrfs_trans_handle
*trans
;
1104 mutex_lock(&root
->fs_info
->fs_mutex
);
1105 trans
= btrfs_start_transaction(root
, 1);
1106 btrfs_set_trans_block_group(trans
, inode
);
1107 ret
= btrfs_commit_transaction(trans
, root
);
1108 mutex_unlock(&root
->fs_info
->fs_mutex
);
1114 * This is somewhat expensive, updating the tree every time the
1115 * inode changes. But, it is most likely to find the inode in cache.
1116 * FIXME, needs more benchmarking...there are no reasons other than performance
1117 * to keep or drop this code.
1119 void btrfs_dirty_inode(struct inode
*inode
)
1121 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1122 struct btrfs_trans_handle
*trans
;
1124 mutex_lock(&root
->fs_info
->fs_mutex
);
1125 trans
= btrfs_start_transaction(root
, 1);
1126 btrfs_set_trans_block_group(trans
, inode
);
1127 btrfs_update_inode(trans
, root
, inode
);
1128 btrfs_end_transaction(trans
, root
);
1129 mutex_unlock(&root
->fs_info
->fs_mutex
);
1132 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1133 struct btrfs_root
*root
,
1135 struct btrfs_block_group_cache
*group
,
1138 struct inode
*inode
;
1139 struct btrfs_inode_item
*inode_item
;
1140 struct btrfs_key
*location
;
1141 struct btrfs_path
*path
;
1145 path
= btrfs_alloc_path();
1148 inode
= new_inode(root
->fs_info
->sb
);
1150 return ERR_PTR(-ENOMEM
);
1152 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1153 inode
->i_mapping
, GFP_NOFS
);
1154 BTRFS_I(inode
)->root
= root
;
1160 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1161 BTRFS_I(inode
)->block_group
= group
;
1163 ret
= btrfs_insert_empty_inode(trans
, root
, path
, objectid
);
1167 inode
->i_uid
= current
->fsuid
;
1168 inode
->i_gid
= current
->fsgid
;
1169 inode
->i_mode
= mode
;
1170 inode
->i_ino
= objectid
;
1171 inode
->i_blocks
= 0;
1172 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1173 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1174 struct btrfs_inode_item
);
1175 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1176 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1177 btrfs_free_path(path
);
1179 location
= &BTRFS_I(inode
)->location
;
1180 location
->objectid
= objectid
;
1181 location
->offset
= 0;
1182 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1184 insert_inode_hash(inode
);
1187 btrfs_free_path(path
);
1188 return ERR_PTR(ret
);
1191 static inline u8
btrfs_inode_type(struct inode
*inode
)
1193 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1196 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1197 struct dentry
*dentry
, struct inode
*inode
)
1200 struct btrfs_key key
;
1201 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1202 struct inode
*parent_inode
;
1204 key
.objectid
= inode
->i_ino
;
1205 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1208 ret
= btrfs_insert_dir_item(trans
, root
,
1209 dentry
->d_name
.name
, dentry
->d_name
.len
,
1210 dentry
->d_parent
->d_inode
->i_ino
,
1211 &key
, btrfs_inode_type(inode
));
1213 parent_inode
= dentry
->d_parent
->d_inode
;
1214 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1215 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1216 ret
= btrfs_update_inode(trans
, root
,
1217 dentry
->d_parent
->d_inode
);
1222 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1223 struct dentry
*dentry
, struct inode
*inode
)
1225 int err
= btrfs_add_link(trans
, dentry
, inode
);
1227 d_instantiate(dentry
, inode
);
1235 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1236 int mode
, dev_t rdev
)
1238 struct btrfs_trans_handle
*trans
;
1239 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1240 struct inode
*inode
;
1246 if (!new_valid_dev(rdev
))
1249 mutex_lock(&root
->fs_info
->fs_mutex
);
1250 trans
= btrfs_start_transaction(root
, 1);
1251 btrfs_set_trans_block_group(trans
, dir
);
1253 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1259 inode
= btrfs_new_inode(trans
, root
, objectid
,
1260 BTRFS_I(dir
)->block_group
, mode
);
1261 err
= PTR_ERR(inode
);
1265 btrfs_set_trans_block_group(trans
, inode
);
1266 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1270 inode
->i_op
= &btrfs_special_inode_operations
;
1271 init_special_inode(inode
, inode
->i_mode
, rdev
);
1272 btrfs_update_inode(trans
, root
, inode
);
1274 dir
->i_sb
->s_dirt
= 1;
1275 btrfs_update_inode_block_group(trans
, inode
);
1276 btrfs_update_inode_block_group(trans
, dir
);
1278 nr
= trans
->blocks_used
;
1279 btrfs_end_transaction(trans
, root
);
1280 mutex_unlock(&root
->fs_info
->fs_mutex
);
1283 inode_dec_link_count(inode
);
1286 btrfs_btree_balance_dirty(root
, nr
);
1290 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1291 int mode
, struct nameidata
*nd
)
1293 struct btrfs_trans_handle
*trans
;
1294 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1295 struct inode
*inode
;
1301 mutex_lock(&root
->fs_info
->fs_mutex
);
1302 trans
= btrfs_start_transaction(root
, 1);
1303 btrfs_set_trans_block_group(trans
, dir
);
1305 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1311 inode
= btrfs_new_inode(trans
, root
, objectid
,
1312 BTRFS_I(dir
)->block_group
, mode
);
1313 err
= PTR_ERR(inode
);
1317 btrfs_set_trans_block_group(trans
, inode
);
1318 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1322 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1323 inode
->i_fop
= &btrfs_file_operations
;
1324 inode
->i_op
= &btrfs_file_inode_operations
;
1325 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1326 inode
->i_mapping
, GFP_NOFS
);
1327 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
1329 dir
->i_sb
->s_dirt
= 1;
1330 btrfs_update_inode_block_group(trans
, inode
);
1331 btrfs_update_inode_block_group(trans
, dir
);
1333 nr
= trans
->blocks_used
;
1334 btrfs_end_transaction(trans
, root
);
1335 mutex_unlock(&root
->fs_info
->fs_mutex
);
1338 inode_dec_link_count(inode
);
1341 btrfs_btree_balance_dirty(root
, nr
);
1345 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1346 struct dentry
*dentry
)
1348 struct btrfs_trans_handle
*trans
;
1349 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1350 struct inode
*inode
= old_dentry
->d_inode
;
1355 if (inode
->i_nlink
== 0)
1359 mutex_lock(&root
->fs_info
->fs_mutex
);
1360 trans
= btrfs_start_transaction(root
, 1);
1362 btrfs_set_trans_block_group(trans
, dir
);
1363 atomic_inc(&inode
->i_count
);
1364 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1369 dir
->i_sb
->s_dirt
= 1;
1370 btrfs_update_inode_block_group(trans
, dir
);
1371 err
= btrfs_update_inode(trans
, root
, inode
);
1376 nr
= trans
->blocks_used
;
1377 btrfs_end_transaction(trans
, root
);
1378 mutex_unlock(&root
->fs_info
->fs_mutex
);
1381 inode_dec_link_count(inode
);
1384 btrfs_btree_balance_dirty(root
, nr
);
1388 static int btrfs_make_empty_dir(struct btrfs_trans_handle
*trans
,
1389 struct btrfs_root
*root
,
1390 u64 objectid
, u64 dirid
)
1394 struct btrfs_key key
;
1399 key
.objectid
= objectid
;
1401 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1403 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 1, objectid
,
1404 &key
, BTRFS_FT_DIR
);
1408 key
.objectid
= dirid
;
1409 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 2, objectid
,
1410 &key
, BTRFS_FT_DIR
);
1417 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1419 struct inode
*inode
;
1420 struct btrfs_trans_handle
*trans
;
1421 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1423 int drop_on_err
= 0;
1425 unsigned long nr
= 1;
1427 mutex_lock(&root
->fs_info
->fs_mutex
);
1428 trans
= btrfs_start_transaction(root
, 1);
1429 btrfs_set_trans_block_group(trans
, dir
);
1431 if (IS_ERR(trans
)) {
1432 err
= PTR_ERR(trans
);
1436 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1442 inode
= btrfs_new_inode(trans
, root
, objectid
,
1443 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1444 if (IS_ERR(inode
)) {
1445 err
= PTR_ERR(inode
);
1450 inode
->i_op
= &btrfs_dir_inode_operations
;
1451 inode
->i_fop
= &btrfs_dir_file_operations
;
1452 btrfs_set_trans_block_group(trans
, inode
);
1454 err
= btrfs_make_empty_dir(trans
, root
, inode
->i_ino
, dir
->i_ino
);
1459 err
= btrfs_update_inode(trans
, root
, inode
);
1463 err
= btrfs_add_link(trans
, dentry
, inode
);
1467 d_instantiate(dentry
, inode
);
1469 dir
->i_sb
->s_dirt
= 1;
1470 btrfs_update_inode_block_group(trans
, inode
);
1471 btrfs_update_inode_block_group(trans
, dir
);
1474 nr
= trans
->blocks_used
;
1475 btrfs_end_transaction(trans
, root
);
1478 mutex_unlock(&root
->fs_info
->fs_mutex
);
1481 btrfs_btree_balance_dirty(root
, nr
);
1485 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1486 size_t page_offset
, u64 start
, u64 end
,
1492 u64 extent_start
= 0;
1494 u64 objectid
= inode
->i_ino
;
1496 int failed_insert
= 0;
1497 struct btrfs_path
*path
;
1498 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1499 struct btrfs_file_extent_item
*item
;
1500 struct extent_buffer
*leaf
;
1501 struct btrfs_key found_key
;
1502 struct extent_map
*em
= NULL
;
1503 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1504 struct btrfs_trans_handle
*trans
= NULL
;
1506 path
= btrfs_alloc_path();
1508 mutex_lock(&root
->fs_info
->fs_mutex
);
1511 em
= lookup_extent_mapping(em_tree
, start
, end
);
1516 em
= alloc_extent_map(GFP_NOFS
);
1521 em
->start
= EXTENT_MAP_HOLE
;
1522 em
->end
= EXTENT_MAP_HOLE
;
1524 em
->bdev
= inode
->i_sb
->s_bdev
;
1525 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
1526 objectid
, start
, 0);
1533 if (path
->slots
[0] == 0)
1538 leaf
= path
->nodes
[0];
1539 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1540 struct btrfs_file_extent_item
);
1541 /* are we inside the extent that was found? */
1542 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1543 found_type
= btrfs_key_type(&found_key
);
1544 if (found_key
.objectid
!= objectid
||
1545 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1549 found_type
= btrfs_file_extent_type(leaf
, item
);
1550 extent_start
= found_key
.offset
;
1551 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1552 extent_end
= extent_start
+
1553 btrfs_file_extent_num_bytes(leaf
, item
);
1555 if (start
< extent_start
|| start
>= extent_end
) {
1557 if (start
< extent_start
) {
1558 if (end
< extent_start
)
1560 em
->end
= extent_end
- 1;
1566 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
1568 em
->start
= extent_start
;
1569 em
->end
= extent_end
- 1;
1570 em
->block_start
= EXTENT_MAP_HOLE
;
1571 em
->block_end
= EXTENT_MAP_HOLE
;
1574 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
1575 em
->block_start
= bytenr
;
1576 em
->block_end
= em
->block_start
+
1577 btrfs_file_extent_num_bytes(leaf
, item
) - 1;
1578 em
->start
= extent_start
;
1579 em
->end
= extent_end
- 1;
1581 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1586 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
1589 extent_end
= (extent_start
+ size
) |
1590 ((u64
)root
->sectorsize
- 1);
1591 if (start
< extent_start
|| start
>= extent_end
) {
1593 if (start
< extent_start
) {
1594 if (end
< extent_start
)
1596 em
->end
= extent_end
;
1603 em
->block_start
= EXTENT_MAP_INLINE
;
1604 em
->block_end
= EXTENT_MAP_INLINE
;
1605 em
->start
= extent_start
;
1606 em
->end
= extent_end
;
1612 ptr
= btrfs_file_extent_inline_start(item
);
1614 read_extent_buffer(leaf
, map
+ page_offset
, ptr
, size
);
1616 memset(map + page_offset + size, 0,
1617 root->sectorsize - (page_offset + size));
1619 flush_dcache_page(page
);
1621 set_extent_uptodate(em_tree
, extent_start
,
1622 extent_end
, GFP_NOFS
);
1625 printk("unkknown found_type %d\n", found_type
);
1632 em
->block_start
= EXTENT_MAP_HOLE
;
1633 em
->block_end
= EXTENT_MAP_HOLE
;
1635 btrfs_release_path(root
, path
);
1636 if (em
->start
> start
|| em
->end
< start
) {
1637 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->end
, start
, end
);
1641 ret
= add_extent_mapping(em_tree
, em
);
1642 if (ret
== -EEXIST
) {
1643 free_extent_map(em
);
1646 if (failed_insert
> 5) {
1647 printk("failing to insert %Lu %Lu\n", start
, end
);
1655 btrfs_free_path(path
);
1657 ret
= btrfs_end_transaction(trans
, root
);
1661 mutex_unlock(&root
->fs_info
->fs_mutex
);
1663 free_extent_map(em
);
1665 return ERR_PTR(err
);
1670 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
1672 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
1675 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1676 unsigned from
, unsigned to
)
1678 return extent_prepare_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1679 page
->mapping
->host
, page
, from
, to
,
1683 int btrfs_readpage(struct file
*file
, struct page
*page
)
1685 struct extent_map_tree
*tree
;
1686 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1687 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
1689 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1691 struct extent_map_tree
*tree
;
1694 if (current
->flags
& PF_MEMALLOC
) {
1695 redirty_page_for_writepage(wbc
, page
);
1699 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1700 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
1703 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
1705 struct extent_map_tree
*tree
;
1708 if (page
->private != 1) {
1710 return try_to_free_buffers(page
);
1712 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1713 ret
= try_release_extent_mapping(tree
, page
);
1715 ClearPagePrivate(page
);
1716 set_page_private(page
, 0);
1717 page_cache_release(page
);
1722 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
1724 struct extent_map_tree
*tree
;
1726 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1727 extent_invalidatepage(tree
, page
, offset
);
1728 btrfs_releasepage(page
, GFP_NOFS
);
1732 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1733 * called from a page fault handler when a page is first dirtied. Hence we must
1734 * be careful to check for EOF conditions here. We set the page up correctly
1735 * for a written page which means we get ENOSPC checking when writing into
1736 * holes and correct delalloc and unwritten extent mapping on filesystems that
1737 * support these features.
1739 * We are not allowed to take the i_mutex here so we have to play games to
1740 * protect against truncate races as the page could now be beyond EOF. Because
1741 * vmtruncate() writes the inode size before removing pages, once we have the
1742 * page lock we can determine safely if the page is beyond EOF. If it is not
1743 * beyond EOF, then the page is guaranteed safe against truncation until we
1746 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
1748 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
1754 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
1756 wait_on_page_writeback(page
);
1757 size
= i_size_read(inode
);
1758 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
1760 if ((page
->mapping
!= inode
->i_mapping
) ||
1761 (page_start
> size
)) {
1762 /* page got truncated out from underneath us */
1766 /* page is wholly or partially inside EOF */
1767 if (page_start
+ PAGE_CACHE_SIZE
> size
)
1768 end
= size
& ~PAGE_CACHE_MASK
;
1770 end
= PAGE_CACHE_SIZE
;
1772 ret
= btrfs_cow_one_page(inode
, page
, end
);
1775 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
1780 static void btrfs_truncate(struct inode
*inode
)
1782 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1784 struct btrfs_trans_handle
*trans
;
1787 if (!S_ISREG(inode
->i_mode
))
1789 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1792 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1794 mutex_lock(&root
->fs_info
->fs_mutex
);
1795 trans
= btrfs_start_transaction(root
, 1);
1796 btrfs_set_trans_block_group(trans
, inode
);
1798 /* FIXME, add redo link to tree so we don't leak on crash */
1799 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1800 btrfs_update_inode(trans
, root
, inode
);
1801 nr
= trans
->blocks_used
;
1803 ret
= btrfs_end_transaction(trans
, root
);
1805 mutex_unlock(&root
->fs_info
->fs_mutex
);
1806 btrfs_btree_balance_dirty(root
, nr
);
1809 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1810 unsigned from
, unsigned to
)
1812 return extent_commit_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1813 page
->mapping
->host
, page
, from
, to
);
1816 static int create_subvol(struct btrfs_root
*root
, char *name
, int namelen
)
1818 struct btrfs_trans_handle
*trans
;
1819 struct btrfs_key key
;
1820 struct btrfs_root_item root_item
;
1821 struct btrfs_inode_item
*inode_item
;
1822 struct extent_buffer
*leaf
;
1823 struct btrfs_root
*new_root
;
1824 struct inode
*inode
;
1829 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
1830 unsigned long nr
= 1;
1832 mutex_lock(&root
->fs_info
->fs_mutex
);
1833 trans
= btrfs_start_transaction(root
, 1);
1836 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
, 0, 0);
1838 return PTR_ERR(leaf
);
1840 btrfs_set_header_nritems(leaf
, 0);
1841 btrfs_set_header_level(leaf
, 0);
1842 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1843 btrfs_set_header_generation(leaf
, trans
->transid
);
1844 btrfs_set_header_owner(leaf
, root
->root_key
.objectid
);
1845 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
1846 (unsigned long)btrfs_header_fsid(leaf
),
1848 btrfs_mark_buffer_dirty(leaf
);
1850 inode_item
= &root_item
.inode
;
1851 memset(inode_item
, 0, sizeof(*inode_item
));
1852 inode_item
->generation
= cpu_to_le64(1);
1853 inode_item
->size
= cpu_to_le64(3);
1854 inode_item
->nlink
= cpu_to_le32(1);
1855 inode_item
->nblocks
= cpu_to_le64(1);
1856 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
1858 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
1859 btrfs_set_root_level(&root_item
, 0);
1860 btrfs_set_root_refs(&root_item
, 1);
1861 btrfs_set_root_used(&root_item
, 0);
1863 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
1864 root_item
.drop_level
= 0;
1866 free_extent_buffer(leaf
);
1869 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1874 btrfs_set_root_dirid(&root_item
, new_dirid
);
1876 key
.objectid
= objectid
;
1878 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1879 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1885 * insert the directory item
1887 key
.offset
= (u64
)-1;
1888 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
1889 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1890 name
, namelen
, dir
->i_ino
, &key
,
1895 ret
= btrfs_commit_transaction(trans
, root
);
1899 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
1902 trans
= btrfs_start_transaction(new_root
, 1);
1905 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
1906 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
1909 inode
->i_op
= &btrfs_dir_inode_operations
;
1910 inode
->i_fop
= &btrfs_dir_file_operations
;
1911 new_root
->inode
= inode
;
1913 ret
= btrfs_make_empty_dir(trans
, new_root
, new_dirid
, new_dirid
);
1919 ret
= btrfs_update_inode(trans
, new_root
, inode
);
1923 nr
= trans
->blocks_used
;
1924 err
= btrfs_commit_transaction(trans
, root
);
1928 mutex_unlock(&root
->fs_info
->fs_mutex
);
1929 btrfs_btree_balance_dirty(root
, nr
);
1933 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
1935 struct btrfs_trans_handle
*trans
;
1936 struct btrfs_key key
;
1937 struct btrfs_root_item new_root_item
;
1938 struct extent_buffer
*tmp
;
1944 if (!root
->ref_cows
)
1947 down_write(&root
->snap_sem
);
1948 freeze_bdev(root
->fs_info
->sb
->s_bdev
);
1949 thaw_bdev(root
->fs_info
->sb
->s_bdev
, root
->fs_info
->sb
);
1951 mutex_lock(&root
->fs_info
->fs_mutex
);
1952 trans
= btrfs_start_transaction(root
, 1);
1955 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
1959 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1964 memcpy(&new_root_item
, &root
->root_item
,
1965 sizeof(new_root_item
));
1967 key
.objectid
= objectid
;
1969 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1971 btrfs_cow_block(trans
, root
, root
->node
, NULL
, 0, &tmp
);
1972 btrfs_set_root_bytenr(&new_root_item
, root
->node
->start
);
1973 btrfs_set_root_level(&new_root_item
, btrfs_header_level(root
->node
));
1975 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1981 * insert the directory item
1983 key
.offset
= (u64
)-1;
1984 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1986 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
1987 &key
, BTRFS_FT_DIR
);
1992 ret
= btrfs_inc_root_ref(trans
, root
);
1996 nr
= trans
->blocks_used
;
1997 err
= btrfs_commit_transaction(trans
, root
);
2002 mutex_unlock(&root
->fs_info
->fs_mutex
);
2003 up_write(&root
->snap_sem
);
2004 btrfs_btree_balance_dirty(root
, nr
);
2008 static unsigned long force_ra(struct address_space
*mapping
,
2009 struct file_ra_state
*ra
, struct file
*file
,
2010 pgoff_t offset
, pgoff_t last_index
)
2014 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2015 req_size
= last_index
- offset
+ 1;
2016 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2019 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2020 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2021 return offset
+ req_size
;
2025 int btrfs_defrag_file(struct file
*file
) {
2026 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2027 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
2029 unsigned long last_index
;
2030 unsigned long ra_index
= 0;
2035 mutex_lock(&inode
->i_mutex
);
2036 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2037 for (i
= 0; i
<= last_index
; i
++) {
2038 if (i
== ra_index
) {
2039 ra_index
= force_ra(inode
->i_mapping
, &file
->f_ra
,
2040 file
, ra_index
, last_index
);
2042 page
= grab_cache_page(inode
->i_mapping
, i
);
2045 if (!PageUptodate(page
)) {
2046 btrfs_readpage(NULL
, page
);
2048 if (!PageUptodate(page
)) {
2050 page_cache_release(page
);
2054 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
2055 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2057 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2058 set_extent_delalloc(em_tree
, page_start
,
2059 page_end
, GFP_NOFS
);
2060 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2061 set_page_dirty(page
);
2063 page_cache_release(page
);
2064 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2068 mutex_unlock(&inode
->i_mutex
);
2072 static int btrfs_ioctl_snap_create(struct btrfs_root
*root
, void __user
*arg
)
2074 struct btrfs_ioctl_vol_args vol_args
;
2075 struct btrfs_dir_item
*di
;
2076 struct btrfs_path
*path
;
2080 if (copy_from_user(&vol_args
, arg
, sizeof(vol_args
)))
2083 namelen
= strlen(vol_args
.name
);
2084 if (namelen
> BTRFS_VOL_NAME_MAX
)
2086 if (strchr(vol_args
.name
, '/'))
2089 path
= btrfs_alloc_path();
2093 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2094 mutex_lock(&root
->fs_info
->fs_mutex
);
2095 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2097 vol_args
.name
, namelen
, 0);
2098 mutex_unlock(&root
->fs_info
->fs_mutex
);
2099 btrfs_free_path(path
);
2100 if (di
&& !IS_ERR(di
))
2105 if (root
== root
->fs_info
->tree_root
)
2106 return create_subvol(root
, vol_args
.name
, namelen
);
2107 return create_snapshot(root
, vol_args
.name
, namelen
);
2110 static int btrfs_ioctl_defrag(struct file
*file
)
2112 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2113 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2115 switch (inode
->i_mode
& S_IFMT
) {
2117 mutex_lock(&root
->fs_info
->fs_mutex
);
2118 btrfs_defrag_root(root
, 0);
2119 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2120 mutex_unlock(&root
->fs_info
->fs_mutex
);
2123 btrfs_defrag_file(file
);
2130 long btrfs_ioctl(struct file
*file
, unsigned int
2131 cmd
, unsigned long arg
)
2133 struct btrfs_root
*root
= BTRFS_I(file
->f_path
.dentry
->d_inode
)->root
;
2136 case BTRFS_IOC_SNAP_CREATE
:
2137 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2138 case BTRFS_IOC_DEFRAG
:
2139 return btrfs_ioctl_defrag(file
);
2146 * Called inside transaction, so use GFP_NOFS
2148 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2150 struct btrfs_inode
*ei
;
2152 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2156 return &ei
->vfs_inode
;
2159 void btrfs_destroy_inode(struct inode
*inode
)
2161 WARN_ON(!list_empty(&inode
->i_dentry
));
2162 WARN_ON(inode
->i_data
.nrpages
);
2164 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2167 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2168 unsigned long flags
)
2170 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2172 inode_init_once(&ei
->vfs_inode
);
2175 void btrfs_destroy_cachep(void)
2177 if (btrfs_inode_cachep
)
2178 kmem_cache_destroy(btrfs_inode_cachep
);
2179 if (btrfs_trans_handle_cachep
)
2180 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2181 if (btrfs_transaction_cachep
)
2182 kmem_cache_destroy(btrfs_transaction_cachep
);
2183 if (btrfs_bit_radix_cachep
)
2184 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2185 if (btrfs_path_cachep
)
2186 kmem_cache_destroy(btrfs_path_cachep
);
2189 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2190 unsigned long extra_flags
,
2191 void (*ctor
)(void *, struct kmem_cache
*,
2194 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2195 SLAB_MEM_SPREAD
| extra_flags
), ctor
2196 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2202 int btrfs_init_cachep(void)
2204 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2205 sizeof(struct btrfs_inode
),
2207 if (!btrfs_inode_cachep
)
2209 btrfs_trans_handle_cachep
=
2210 btrfs_cache_create("btrfs_trans_handle_cache",
2211 sizeof(struct btrfs_trans_handle
),
2213 if (!btrfs_trans_handle_cachep
)
2215 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2216 sizeof(struct btrfs_transaction
),
2218 if (!btrfs_transaction_cachep
)
2220 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2221 sizeof(struct btrfs_path
),
2223 if (!btrfs_path_cachep
)
2225 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2226 SLAB_DESTROY_BY_RCU
, NULL
);
2227 if (!btrfs_bit_radix_cachep
)
2231 btrfs_destroy_cachep();
2235 static int btrfs_getattr(struct vfsmount
*mnt
,
2236 struct dentry
*dentry
, struct kstat
*stat
)
2238 struct inode
*inode
= dentry
->d_inode
;
2239 generic_fillattr(inode
, stat
);
2240 stat
->blksize
= 256 * 1024;
2244 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2245 struct inode
* new_dir
,struct dentry
*new_dentry
)
2247 struct btrfs_trans_handle
*trans
;
2248 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2249 struct inode
*new_inode
= new_dentry
->d_inode
;
2250 struct inode
*old_inode
= old_dentry
->d_inode
;
2251 struct timespec ctime
= CURRENT_TIME
;
2252 struct btrfs_path
*path
;
2253 struct btrfs_dir_item
*di
;
2256 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2257 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2261 mutex_lock(&root
->fs_info
->fs_mutex
);
2262 trans
= btrfs_start_transaction(root
, 1);
2264 btrfs_set_trans_block_group(trans
, new_dir
);
2265 path
= btrfs_alloc_path();
2271 old_dentry
->d_inode
->i_nlink
++;
2272 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2273 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2274 old_inode
->i_ctime
= ctime
;
2276 if (S_ISDIR(old_inode
->i_mode
) && old_dir
!= new_dir
) {
2277 struct btrfs_key
*location
= &BTRFS_I(new_dir
)->location
;
2278 struct btrfs_key old_parent_key
;
2279 di
= btrfs_lookup_dir_item(trans
, root
, path
, old_inode
->i_ino
,
2289 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &old_parent_key
);
2290 ret
= btrfs_del_item(trans
, root
, path
);
2294 btrfs_release_path(root
, path
);
2296 di
= btrfs_lookup_dir_index_item(trans
, root
, path
,
2298 old_parent_key
.objectid
,
2308 ret
= btrfs_del_item(trans
, root
, path
);
2312 btrfs_release_path(root
, path
);
2314 ret
= btrfs_insert_dir_item(trans
, root
, "..", 2,
2315 old_inode
->i_ino
, location
,
2322 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2327 new_inode
->i_ctime
= CURRENT_TIME
;
2328 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2332 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2337 btrfs_free_path(path
);
2338 btrfs_end_transaction(trans
, root
);
2339 mutex_unlock(&root
->fs_info
->fs_mutex
);
2343 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2344 const char *symname
)
2346 struct btrfs_trans_handle
*trans
;
2347 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2348 struct btrfs_path
*path
;
2349 struct btrfs_key key
;
2350 struct inode
*inode
;
2357 struct btrfs_file_extent_item
*ei
;
2358 struct extent_buffer
*leaf
;
2361 name_len
= strlen(symname
) + 1;
2362 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2363 return -ENAMETOOLONG
;
2364 mutex_lock(&root
->fs_info
->fs_mutex
);
2365 trans
= btrfs_start_transaction(root
, 1);
2366 btrfs_set_trans_block_group(trans
, dir
);
2368 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2374 inode
= btrfs_new_inode(trans
, root
, objectid
,
2375 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2376 err
= PTR_ERR(inode
);
2380 btrfs_set_trans_block_group(trans
, inode
);
2381 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2385 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2386 inode
->i_fop
= &btrfs_file_operations
;
2387 inode
->i_op
= &btrfs_file_inode_operations
;
2388 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
2389 inode
->i_mapping
, GFP_NOFS
);
2390 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
2392 dir
->i_sb
->s_dirt
= 1;
2393 btrfs_update_inode_block_group(trans
, inode
);
2394 btrfs_update_inode_block_group(trans
, dir
);
2398 path
= btrfs_alloc_path();
2400 key
.objectid
= inode
->i_ino
;
2402 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2403 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2404 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2410 leaf
= path
->nodes
[0];
2411 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2412 struct btrfs_file_extent_item
);
2413 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2414 btrfs_set_file_extent_type(leaf
, ei
,
2415 BTRFS_FILE_EXTENT_INLINE
);
2416 ptr
= btrfs_file_extent_inline_start(ei
);
2417 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
2418 btrfs_mark_buffer_dirty(leaf
);
2419 btrfs_free_path(path
);
2421 inode
->i_op
= &btrfs_symlink_inode_operations
;
2422 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2423 inode
->i_size
= name_len
- 1;
2424 err
= btrfs_update_inode(trans
, root
, inode
);
2429 nr
= trans
->blocks_used
;
2430 btrfs_end_transaction(trans
, root
);
2431 mutex_unlock(&root
->fs_info
->fs_mutex
);
2433 inode_dec_link_count(inode
);
2436 btrfs_btree_balance_dirty(root
, nr
);
2440 static struct inode_operations btrfs_dir_inode_operations
= {
2441 .lookup
= btrfs_lookup
,
2442 .create
= btrfs_create
,
2443 .unlink
= btrfs_unlink
,
2445 .mkdir
= btrfs_mkdir
,
2446 .rmdir
= btrfs_rmdir
,
2447 .rename
= btrfs_rename
,
2448 .symlink
= btrfs_symlink
,
2449 .setattr
= btrfs_setattr
,
2450 .mknod
= btrfs_mknod
,
2453 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2454 .lookup
= btrfs_lookup
,
2457 static struct file_operations btrfs_dir_file_operations
= {
2458 .llseek
= generic_file_llseek
,
2459 .read
= generic_read_dir
,
2460 .readdir
= btrfs_readdir
,
2461 .unlocked_ioctl
= btrfs_ioctl
,
2462 #ifdef CONFIG_COMPAT
2463 .compat_ioctl
= btrfs_ioctl
,
2467 static struct extent_map_ops btrfs_extent_map_ops
= {
2468 .fill_delalloc
= run_delalloc_range
,
2469 .writepage_io_hook
= btrfs_writepage_io_hook
,
2470 .readpage_io_hook
= btrfs_readpage_io_hook
,
2471 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2474 static struct address_space_operations btrfs_aops
= {
2475 .readpage
= btrfs_readpage
,
2476 .writepage
= btrfs_writepage
,
2477 .sync_page
= block_sync_page
,
2478 .prepare_write
= btrfs_prepare_write
,
2479 .commit_write
= btrfs_commit_write
,
2481 .invalidatepage
= btrfs_invalidatepage
,
2482 .releasepage
= btrfs_releasepage
,
2483 .set_page_dirty
= __set_page_dirty_nobuffers
,
2486 static struct address_space_operations btrfs_symlink_aops
= {
2487 .readpage
= btrfs_readpage
,
2488 .writepage
= btrfs_writepage
,
2489 .invalidatepage
= btrfs_invalidatepage
,
2490 .releasepage
= btrfs_releasepage
,
2493 static struct inode_operations btrfs_file_inode_operations
= {
2494 .truncate
= btrfs_truncate
,
2495 .getattr
= btrfs_getattr
,
2496 .setattr
= btrfs_setattr
,
2499 static struct inode_operations btrfs_special_inode_operations
= {
2500 .getattr
= btrfs_getattr
,
2501 .setattr
= btrfs_setattr
,
2504 static struct inode_operations btrfs_symlink_inode_operations
= {
2505 .readlink
= generic_readlink
,
2506 .follow_link
= page_follow_link_light
,
2507 .put_link
= page_put_link
,