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
, start
, &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
, pos
,
782 err
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
783 pos
, 0, 0, hole_size
);
784 btrfs_end_transaction(trans
, root
);
785 mutex_unlock(&root
->fs_info
->fs_mutex
);
786 unlock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
791 err
= inode_setattr(inode
, attr
);
795 void btrfs_delete_inode(struct inode
*inode
)
797 struct btrfs_trans_handle
*trans
;
798 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
802 truncate_inode_pages(&inode
->i_data
, 0);
803 if (is_bad_inode(inode
)) {
808 mutex_lock(&root
->fs_info
->fs_mutex
);
809 trans
= btrfs_start_transaction(root
, 1);
811 btrfs_set_trans_block_group(trans
, inode
);
812 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
815 ret
= btrfs_free_inode(trans
, root
, inode
);
818 nr
= trans
->blocks_used
;
820 btrfs_end_transaction(trans
, root
);
821 mutex_unlock(&root
->fs_info
->fs_mutex
);
822 btrfs_btree_balance_dirty(root
, nr
);
826 nr
= trans
->blocks_used
;
827 btrfs_end_transaction(trans
, root
);
828 mutex_unlock(&root
->fs_info
->fs_mutex
);
829 btrfs_btree_balance_dirty(root
, nr
);
835 * this returns the key found in the dir entry in the location pointer.
836 * If no dir entries were found, location->objectid is 0.
838 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
839 struct btrfs_key
*location
)
841 const char *name
= dentry
->d_name
.name
;
842 int namelen
= dentry
->d_name
.len
;
843 struct btrfs_dir_item
*di
;
844 struct btrfs_path
*path
;
845 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
848 path
= btrfs_alloc_path();
850 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
852 if (!di
|| IS_ERR(di
)) {
853 location
->objectid
= 0;
857 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
859 btrfs_release_path(root
, path
);
860 btrfs_free_path(path
);
865 * when we hit a tree root in a directory, the btrfs part of the inode
866 * needs to be changed to reflect the root directory of the tree root. This
867 * is kind of like crossing a mount point.
869 static int fixup_tree_root_location(struct btrfs_root
*root
,
870 struct btrfs_key
*location
,
871 struct btrfs_root
**sub_root
,
872 struct dentry
*dentry
)
874 struct btrfs_path
*path
;
875 struct btrfs_root_item
*ri
;
877 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
879 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
882 path
= btrfs_alloc_path();
884 mutex_lock(&root
->fs_info
->fs_mutex
);
886 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
889 if (IS_ERR(*sub_root
))
890 return PTR_ERR(*sub_root
);
892 ri
= &(*sub_root
)->root_item
;
893 location
->objectid
= btrfs_root_dirid(ri
);
894 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
895 location
->offset
= 0;
897 btrfs_free_path(path
);
898 mutex_unlock(&root
->fs_info
->fs_mutex
);
902 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
904 struct btrfs_iget_args
*args
= p
;
905 inode
->i_ino
= args
->ino
;
906 BTRFS_I(inode
)->root
= args
->root
;
907 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
908 inode
->i_mapping
, GFP_NOFS
);
912 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
914 struct btrfs_iget_args
*args
= opaque
;
915 return (args
->ino
== inode
->i_ino
&&
916 args
->root
== BTRFS_I(inode
)->root
);
919 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
920 struct btrfs_root
*root
)
923 struct btrfs_iget_args args
;
927 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
928 btrfs_init_locked_inode
,
933 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
934 struct nameidata
*nd
)
936 struct inode
* inode
;
937 struct btrfs_inode
*bi
= BTRFS_I(dir
);
938 struct btrfs_root
*root
= bi
->root
;
939 struct btrfs_root
*sub_root
= root
;
940 struct btrfs_key location
;
943 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
944 return ERR_PTR(-ENAMETOOLONG
);
946 mutex_lock(&root
->fs_info
->fs_mutex
);
947 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
948 mutex_unlock(&root
->fs_info
->fs_mutex
);
954 if (location
.objectid
) {
955 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
960 return ERR_PTR(-ENOENT
);
961 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
964 return ERR_PTR(-EACCES
);
965 if (inode
->i_state
& I_NEW
) {
966 /* the inode and parent dir are two different roots */
967 if (sub_root
!= root
) {
969 sub_root
->inode
= inode
;
971 BTRFS_I(inode
)->root
= sub_root
;
972 memcpy(&BTRFS_I(inode
)->location
, &location
,
974 btrfs_read_locked_inode(inode
);
975 unlock_new_inode(inode
);
978 return d_splice_alias(inode
, dentry
);
981 static unsigned char btrfs_filetype_table
[] = {
982 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
985 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
987 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
988 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
989 struct btrfs_item
*item
;
990 struct btrfs_dir_item
*di
;
991 struct btrfs_key key
;
992 struct btrfs_key found_key
;
993 struct btrfs_path
*path
;
996 struct extent_buffer
*leaf
;
999 unsigned char d_type
;
1004 int key_type
= BTRFS_DIR_INDEX_KEY
;
1009 /* FIXME, use a real flag for deciding about the key type */
1010 if (root
->fs_info
->tree_root
== root
)
1011 key_type
= BTRFS_DIR_ITEM_KEY
;
1013 mutex_lock(&root
->fs_info
->fs_mutex
);
1014 key
.objectid
= inode
->i_ino
;
1015 btrfs_set_key_type(&key
, key_type
);
1016 key
.offset
= filp
->f_pos
;
1018 path
= btrfs_alloc_path();
1020 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1025 leaf
= path
->nodes
[0];
1026 nritems
= btrfs_header_nritems(leaf
);
1027 slot
= path
->slots
[0];
1028 if (advance
|| slot
>= nritems
) {
1029 if (slot
>= nritems
-1) {
1030 ret
= btrfs_next_leaf(root
, path
);
1033 leaf
= path
->nodes
[0];
1034 nritems
= btrfs_header_nritems(leaf
);
1035 slot
= path
->slots
[0];
1042 item
= btrfs_item_nr(leaf
, slot
);
1043 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1045 if (found_key
.objectid
!= key
.objectid
)
1047 if (btrfs_key_type(&found_key
) != key_type
)
1049 if (found_key
.offset
< filp
->f_pos
)
1052 filp
->f_pos
= found_key
.offset
;
1054 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1056 di_total
= btrfs_item_size(leaf
, item
);
1057 while(di_cur
< di_total
) {
1058 struct btrfs_key location
;
1060 name_len
= btrfs_dir_name_len(leaf
, di
);
1061 if (name_len
< 32) {
1062 name_ptr
= tmp_name
;
1064 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1067 read_extent_buffer(leaf
, name_ptr
,
1068 (unsigned long)(di
+ 1), name_len
);
1070 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1071 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1073 over
= filldir(dirent
, name_ptr
, name_len
,
1078 if (name_ptr
!= tmp_name
)
1083 di_len
= btrfs_dir_name_len(leaf
, di
) + sizeof(*di
);
1085 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1092 btrfs_release_path(root
, path
);
1093 btrfs_free_path(path
);
1094 mutex_unlock(&root
->fs_info
->fs_mutex
);
1098 int btrfs_write_inode(struct inode
*inode
, int wait
)
1100 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1101 struct btrfs_trans_handle
*trans
;
1105 mutex_lock(&root
->fs_info
->fs_mutex
);
1106 trans
= btrfs_start_transaction(root
, 1);
1107 btrfs_set_trans_block_group(trans
, inode
);
1108 ret
= btrfs_commit_transaction(trans
, root
);
1109 mutex_unlock(&root
->fs_info
->fs_mutex
);
1115 * This is somewhat expensive, updating the tree every time the
1116 * inode changes. But, it is most likely to find the inode in cache.
1117 * FIXME, needs more benchmarking...there are no reasons other than performance
1118 * to keep or drop this code.
1120 void btrfs_dirty_inode(struct inode
*inode
)
1122 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1123 struct btrfs_trans_handle
*trans
;
1125 mutex_lock(&root
->fs_info
->fs_mutex
);
1126 trans
= btrfs_start_transaction(root
, 1);
1127 btrfs_set_trans_block_group(trans
, inode
);
1128 btrfs_update_inode(trans
, root
, inode
);
1129 btrfs_end_transaction(trans
, root
);
1130 mutex_unlock(&root
->fs_info
->fs_mutex
);
1133 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1134 struct btrfs_root
*root
,
1136 struct btrfs_block_group_cache
*group
,
1139 struct inode
*inode
;
1140 struct btrfs_inode_item
*inode_item
;
1141 struct btrfs_key
*location
;
1142 struct btrfs_path
*path
;
1146 path
= btrfs_alloc_path();
1149 inode
= new_inode(root
->fs_info
->sb
);
1151 return ERR_PTR(-ENOMEM
);
1153 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1154 inode
->i_mapping
, GFP_NOFS
);
1155 BTRFS_I(inode
)->root
= root
;
1161 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1162 BTRFS_I(inode
)->block_group
= group
;
1164 ret
= btrfs_insert_empty_inode(trans
, root
, path
, objectid
);
1168 inode
->i_uid
= current
->fsuid
;
1169 inode
->i_gid
= current
->fsgid
;
1170 inode
->i_mode
= mode
;
1171 inode
->i_ino
= objectid
;
1172 inode
->i_blocks
= 0;
1173 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1174 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1175 struct btrfs_inode_item
);
1176 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1177 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1178 btrfs_free_path(path
);
1180 location
= &BTRFS_I(inode
)->location
;
1181 location
->objectid
= objectid
;
1182 location
->offset
= 0;
1183 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1185 insert_inode_hash(inode
);
1188 btrfs_free_path(path
);
1189 return ERR_PTR(ret
);
1192 static inline u8
btrfs_inode_type(struct inode
*inode
)
1194 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1197 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1198 struct dentry
*dentry
, struct inode
*inode
)
1201 struct btrfs_key key
;
1202 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1203 struct inode
*parent_inode
;
1205 key
.objectid
= inode
->i_ino
;
1206 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1209 ret
= btrfs_insert_dir_item(trans
, root
,
1210 dentry
->d_name
.name
, dentry
->d_name
.len
,
1211 dentry
->d_parent
->d_inode
->i_ino
,
1212 &key
, btrfs_inode_type(inode
));
1214 parent_inode
= dentry
->d_parent
->d_inode
;
1215 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1216 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1217 ret
= btrfs_update_inode(trans
, root
,
1218 dentry
->d_parent
->d_inode
);
1223 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1224 struct dentry
*dentry
, struct inode
*inode
)
1226 int err
= btrfs_add_link(trans
, dentry
, inode
);
1228 d_instantiate(dentry
, inode
);
1236 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1237 int mode
, dev_t rdev
)
1239 struct btrfs_trans_handle
*trans
;
1240 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1241 struct inode
*inode
;
1247 if (!new_valid_dev(rdev
))
1250 mutex_lock(&root
->fs_info
->fs_mutex
);
1251 trans
= btrfs_start_transaction(root
, 1);
1252 btrfs_set_trans_block_group(trans
, dir
);
1254 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1260 inode
= btrfs_new_inode(trans
, root
, objectid
,
1261 BTRFS_I(dir
)->block_group
, mode
);
1262 err
= PTR_ERR(inode
);
1266 btrfs_set_trans_block_group(trans
, inode
);
1267 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1271 inode
->i_op
= &btrfs_special_inode_operations
;
1272 init_special_inode(inode
, inode
->i_mode
, rdev
);
1273 btrfs_update_inode(trans
, root
, inode
);
1275 dir
->i_sb
->s_dirt
= 1;
1276 btrfs_update_inode_block_group(trans
, inode
);
1277 btrfs_update_inode_block_group(trans
, dir
);
1279 nr
= trans
->blocks_used
;
1280 btrfs_end_transaction(trans
, root
);
1281 mutex_unlock(&root
->fs_info
->fs_mutex
);
1284 inode_dec_link_count(inode
);
1287 btrfs_btree_balance_dirty(root
, nr
);
1291 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1292 int mode
, struct nameidata
*nd
)
1294 struct btrfs_trans_handle
*trans
;
1295 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1296 struct inode
*inode
;
1302 mutex_lock(&root
->fs_info
->fs_mutex
);
1303 trans
= btrfs_start_transaction(root
, 1);
1304 btrfs_set_trans_block_group(trans
, dir
);
1306 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1312 inode
= btrfs_new_inode(trans
, root
, objectid
,
1313 BTRFS_I(dir
)->block_group
, mode
);
1314 err
= PTR_ERR(inode
);
1318 btrfs_set_trans_block_group(trans
, inode
);
1319 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1323 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1324 inode
->i_fop
= &btrfs_file_operations
;
1325 inode
->i_op
= &btrfs_file_inode_operations
;
1326 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1327 inode
->i_mapping
, GFP_NOFS
);
1328 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
1330 dir
->i_sb
->s_dirt
= 1;
1331 btrfs_update_inode_block_group(trans
, inode
);
1332 btrfs_update_inode_block_group(trans
, dir
);
1334 nr
= trans
->blocks_used
;
1335 btrfs_end_transaction(trans
, root
);
1336 mutex_unlock(&root
->fs_info
->fs_mutex
);
1339 inode_dec_link_count(inode
);
1342 btrfs_btree_balance_dirty(root
, nr
);
1346 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1347 struct dentry
*dentry
)
1349 struct btrfs_trans_handle
*trans
;
1350 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1351 struct inode
*inode
= old_dentry
->d_inode
;
1356 if (inode
->i_nlink
== 0)
1360 mutex_lock(&root
->fs_info
->fs_mutex
);
1361 trans
= btrfs_start_transaction(root
, 1);
1363 btrfs_set_trans_block_group(trans
, dir
);
1364 atomic_inc(&inode
->i_count
);
1365 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1370 dir
->i_sb
->s_dirt
= 1;
1371 btrfs_update_inode_block_group(trans
, dir
);
1372 err
= btrfs_update_inode(trans
, root
, inode
);
1377 nr
= trans
->blocks_used
;
1378 btrfs_end_transaction(trans
, root
);
1379 mutex_unlock(&root
->fs_info
->fs_mutex
);
1382 inode_dec_link_count(inode
);
1385 btrfs_btree_balance_dirty(root
, nr
);
1389 static int btrfs_make_empty_dir(struct btrfs_trans_handle
*trans
,
1390 struct btrfs_root
*root
,
1391 u64 objectid
, u64 dirid
)
1395 struct btrfs_key key
;
1400 key
.objectid
= objectid
;
1402 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1404 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 1, objectid
,
1405 &key
, BTRFS_FT_DIR
);
1409 key
.objectid
= dirid
;
1410 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 2, objectid
,
1411 &key
, BTRFS_FT_DIR
);
1418 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1420 struct inode
*inode
;
1421 struct btrfs_trans_handle
*trans
;
1422 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1424 int drop_on_err
= 0;
1426 unsigned long nr
= 1;
1428 mutex_lock(&root
->fs_info
->fs_mutex
);
1429 trans
= btrfs_start_transaction(root
, 1);
1430 btrfs_set_trans_block_group(trans
, dir
);
1432 if (IS_ERR(trans
)) {
1433 err
= PTR_ERR(trans
);
1437 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1443 inode
= btrfs_new_inode(trans
, root
, objectid
,
1444 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1445 if (IS_ERR(inode
)) {
1446 err
= PTR_ERR(inode
);
1451 inode
->i_op
= &btrfs_dir_inode_operations
;
1452 inode
->i_fop
= &btrfs_dir_file_operations
;
1453 btrfs_set_trans_block_group(trans
, inode
);
1455 err
= btrfs_make_empty_dir(trans
, root
, inode
->i_ino
, dir
->i_ino
);
1460 err
= btrfs_update_inode(trans
, root
, inode
);
1464 err
= btrfs_add_link(trans
, dentry
, inode
);
1468 d_instantiate(dentry
, inode
);
1470 dir
->i_sb
->s_dirt
= 1;
1471 btrfs_update_inode_block_group(trans
, inode
);
1472 btrfs_update_inode_block_group(trans
, dir
);
1475 nr
= trans
->blocks_used
;
1476 btrfs_end_transaction(trans
, root
);
1479 mutex_unlock(&root
->fs_info
->fs_mutex
);
1482 btrfs_btree_balance_dirty(root
, nr
);
1486 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1487 size_t page_offset
, u64 start
, u64 end
,
1493 u64 extent_start
= 0;
1495 u64 objectid
= inode
->i_ino
;
1497 int failed_insert
= 0;
1498 struct btrfs_path
*path
;
1499 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1500 struct btrfs_file_extent_item
*item
;
1501 struct extent_buffer
*leaf
;
1502 struct btrfs_key found_key
;
1503 struct extent_map
*em
= NULL
;
1504 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1505 struct btrfs_trans_handle
*trans
= NULL
;
1507 path
= btrfs_alloc_path();
1509 mutex_lock(&root
->fs_info
->fs_mutex
);
1512 em
= lookup_extent_mapping(em_tree
, start
, end
);
1517 em
= alloc_extent_map(GFP_NOFS
);
1522 em
->start
= EXTENT_MAP_HOLE
;
1523 em
->end
= EXTENT_MAP_HOLE
;
1525 em
->bdev
= inode
->i_sb
->s_bdev
;
1526 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
1527 objectid
, start
, 0);
1534 if (path
->slots
[0] == 0)
1539 leaf
= path
->nodes
[0];
1540 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1541 struct btrfs_file_extent_item
);
1542 /* are we inside the extent that was found? */
1543 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1544 found_type
= btrfs_key_type(&found_key
);
1545 if (found_key
.objectid
!= objectid
||
1546 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1550 found_type
= btrfs_file_extent_type(leaf
, item
);
1551 extent_start
= found_key
.offset
;
1552 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1553 extent_end
= extent_start
+
1554 btrfs_file_extent_num_bytes(leaf
, item
);
1556 if (start
< extent_start
|| start
>= extent_end
) {
1558 if (start
< extent_start
) {
1559 if (end
< extent_start
)
1561 em
->end
= extent_end
- 1;
1567 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
1569 em
->start
= extent_start
;
1570 em
->end
= extent_end
- 1;
1571 em
->block_start
= EXTENT_MAP_HOLE
;
1572 em
->block_end
= EXTENT_MAP_HOLE
;
1575 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
1576 em
->block_start
= bytenr
;
1577 em
->block_end
= em
->block_start
+
1578 btrfs_file_extent_num_bytes(leaf
, item
) - 1;
1579 em
->start
= extent_start
;
1580 em
->end
= extent_end
- 1;
1582 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1586 size_t extent_offset
;
1589 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
1592 extent_end
= (extent_start
+ size
) |
1593 ((u64
)root
->sectorsize
- 1);
1594 if (start
< extent_start
|| start
>= extent_end
) {
1596 if (start
< extent_start
) {
1597 if (end
< extent_start
)
1599 em
->end
= extent_end
;
1606 extent_offset
= (page
->index
<< PAGE_CACHE_SHIFT
) -
1608 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
1610 copy_size
= min(PAGE_CACHE_SIZE
- page_offset
,
1611 size
- extent_offset
);
1613 em
->block_start
= EXTENT_MAP_INLINE
;
1614 em
->block_end
= EXTENT_MAP_INLINE
;
1615 em
->start
= extent_start
+ extent_offset
;
1616 em
->end
= (em
->start
+ copy_size
-1) |
1617 ((u64
)root
->sectorsize
-1);
1623 read_extent_buffer(leaf
, map
+ page_offset
, ptr
, copy_size
);
1625 memset(map + page_offset + copy_size, 0,
1626 PAGE_CACHE_SIZE - copy_size - page_offset);
1628 flush_dcache_page(page
);
1630 set_extent_uptodate(em_tree
, em
->start
, em
->end
, GFP_NOFS
);
1633 printk("unkknown found_type %d\n", found_type
);
1640 em
->block_start
= EXTENT_MAP_HOLE
;
1641 em
->block_end
= EXTENT_MAP_HOLE
;
1643 btrfs_release_path(root
, path
);
1644 if (em
->start
> start
|| em
->end
< start
) {
1645 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->end
, start
, end
);
1649 ret
= add_extent_mapping(em_tree
, em
);
1650 if (ret
== -EEXIST
) {
1651 free_extent_map(em
);
1654 if (failed_insert
> 5) {
1655 printk("failing to insert %Lu %Lu\n", start
, end
);
1663 btrfs_free_path(path
);
1665 ret
= btrfs_end_transaction(trans
, root
);
1669 mutex_unlock(&root
->fs_info
->fs_mutex
);
1671 free_extent_map(em
);
1673 return ERR_PTR(err
);
1678 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
1680 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
1683 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1684 unsigned from
, unsigned to
)
1686 return extent_prepare_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1687 page
->mapping
->host
, page
, from
, to
,
1691 int btrfs_readpage(struct file
*file
, struct page
*page
)
1693 struct extent_map_tree
*tree
;
1694 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1695 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
1697 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1699 struct extent_map_tree
*tree
;
1702 if (current
->flags
& PF_MEMALLOC
) {
1703 redirty_page_for_writepage(wbc
, page
);
1707 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1708 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
1711 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
1713 struct extent_map_tree
*tree
;
1716 if (page
->private != 1) {
1718 return try_to_free_buffers(page
);
1720 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1721 ret
= try_release_extent_mapping(tree
, page
);
1723 ClearPagePrivate(page
);
1724 set_page_private(page
, 0);
1725 page_cache_release(page
);
1730 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
1732 struct extent_map_tree
*tree
;
1734 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1735 extent_invalidatepage(tree
, page
, offset
);
1736 btrfs_releasepage(page
, GFP_NOFS
);
1740 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1741 * called from a page fault handler when a page is first dirtied. Hence we must
1742 * be careful to check for EOF conditions here. We set the page up correctly
1743 * for a written page which means we get ENOSPC checking when writing into
1744 * holes and correct delalloc and unwritten extent mapping on filesystems that
1745 * support these features.
1747 * We are not allowed to take the i_mutex here so we have to play games to
1748 * protect against truncate races as the page could now be beyond EOF. Because
1749 * vmtruncate() writes the inode size before removing pages, once we have the
1750 * page lock we can determine safely if the page is beyond EOF. If it is not
1751 * beyond EOF, then the page is guaranteed safe against truncation until we
1754 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
1756 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
1762 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
1764 wait_on_page_writeback(page
);
1765 size
= i_size_read(inode
);
1766 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
1768 if ((page
->mapping
!= inode
->i_mapping
) ||
1769 (page_start
> size
)) {
1770 /* page got truncated out from underneath us */
1774 /* page is wholly or partially inside EOF */
1775 if (page_start
+ PAGE_CACHE_SIZE
> size
)
1776 end
= size
& ~PAGE_CACHE_MASK
;
1778 end
= PAGE_CACHE_SIZE
;
1780 ret
= btrfs_cow_one_page(inode
, page
, end
);
1783 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
1788 static void btrfs_truncate(struct inode
*inode
)
1790 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1792 struct btrfs_trans_handle
*trans
;
1795 if (!S_ISREG(inode
->i_mode
))
1797 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1800 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1802 mutex_lock(&root
->fs_info
->fs_mutex
);
1803 trans
= btrfs_start_transaction(root
, 1);
1804 btrfs_set_trans_block_group(trans
, inode
);
1806 /* FIXME, add redo link to tree so we don't leak on crash */
1807 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1808 btrfs_update_inode(trans
, root
, inode
);
1809 nr
= trans
->blocks_used
;
1811 ret
= btrfs_end_transaction(trans
, root
);
1813 mutex_unlock(&root
->fs_info
->fs_mutex
);
1814 btrfs_btree_balance_dirty(root
, nr
);
1817 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1818 unsigned from
, unsigned to
)
1820 return extent_commit_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1821 page
->mapping
->host
, page
, from
, to
);
1824 static int create_subvol(struct btrfs_root
*root
, char *name
, int namelen
)
1826 struct btrfs_trans_handle
*trans
;
1827 struct btrfs_key key
;
1828 struct btrfs_root_item root_item
;
1829 struct btrfs_inode_item
*inode_item
;
1830 struct extent_buffer
*leaf
;
1831 struct btrfs_root
*new_root
;
1832 struct inode
*inode
;
1837 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
1838 unsigned long nr
= 1;
1840 mutex_lock(&root
->fs_info
->fs_mutex
);
1841 trans
= btrfs_start_transaction(root
, 1);
1844 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
, 0, 0);
1846 return PTR_ERR(leaf
);
1848 btrfs_set_header_nritems(leaf
, 0);
1849 btrfs_set_header_level(leaf
, 0);
1850 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1851 btrfs_set_header_generation(leaf
, trans
->transid
);
1852 btrfs_set_header_owner(leaf
, root
->root_key
.objectid
);
1853 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
1854 (unsigned long)btrfs_header_fsid(leaf
),
1856 btrfs_mark_buffer_dirty(leaf
);
1858 inode_item
= &root_item
.inode
;
1859 memset(inode_item
, 0, sizeof(*inode_item
));
1860 inode_item
->generation
= cpu_to_le64(1);
1861 inode_item
->size
= cpu_to_le64(3);
1862 inode_item
->nlink
= cpu_to_le32(1);
1863 inode_item
->nblocks
= cpu_to_le64(1);
1864 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
1866 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
1867 btrfs_set_root_level(&root_item
, 0);
1868 btrfs_set_root_refs(&root_item
, 1);
1869 btrfs_set_root_used(&root_item
, 0);
1871 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
1872 root_item
.drop_level
= 0;
1874 free_extent_buffer(leaf
);
1877 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1882 btrfs_set_root_dirid(&root_item
, new_dirid
);
1884 key
.objectid
= objectid
;
1886 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1887 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1893 * insert the directory item
1895 key
.offset
= (u64
)-1;
1896 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
1897 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1898 name
, namelen
, dir
->i_ino
, &key
,
1903 ret
= btrfs_commit_transaction(trans
, root
);
1907 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
1910 trans
= btrfs_start_transaction(new_root
, 1);
1913 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
1914 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
1917 inode
->i_op
= &btrfs_dir_inode_operations
;
1918 inode
->i_fop
= &btrfs_dir_file_operations
;
1919 new_root
->inode
= inode
;
1921 ret
= btrfs_make_empty_dir(trans
, new_root
, new_dirid
, new_dirid
);
1927 ret
= btrfs_update_inode(trans
, new_root
, inode
);
1931 nr
= trans
->blocks_used
;
1932 err
= btrfs_commit_transaction(trans
, root
);
1936 mutex_unlock(&root
->fs_info
->fs_mutex
);
1937 btrfs_btree_balance_dirty(root
, nr
);
1941 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
1943 struct btrfs_trans_handle
*trans
;
1944 struct btrfs_key key
;
1945 struct btrfs_root_item new_root_item
;
1946 struct extent_buffer
*tmp
;
1952 if (!root
->ref_cows
)
1955 down_write(&root
->snap_sem
);
1956 freeze_bdev(root
->fs_info
->sb
->s_bdev
);
1957 thaw_bdev(root
->fs_info
->sb
->s_bdev
, root
->fs_info
->sb
);
1959 mutex_lock(&root
->fs_info
->fs_mutex
);
1960 trans
= btrfs_start_transaction(root
, 1);
1963 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
1967 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1972 memcpy(&new_root_item
, &root
->root_item
,
1973 sizeof(new_root_item
));
1975 key
.objectid
= objectid
;
1977 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1979 btrfs_cow_block(trans
, root
, root
->node
, NULL
, 0, &tmp
);
1980 btrfs_set_root_bytenr(&new_root_item
, root
->node
->start
);
1981 btrfs_set_root_level(&new_root_item
, btrfs_header_level(root
->node
));
1983 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1989 * insert the directory item
1991 key
.offset
= (u64
)-1;
1992 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1994 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
1995 &key
, BTRFS_FT_DIR
);
2000 ret
= btrfs_inc_root_ref(trans
, root
);
2004 nr
= trans
->blocks_used
;
2005 err
= btrfs_commit_transaction(trans
, root
);
2010 mutex_unlock(&root
->fs_info
->fs_mutex
);
2011 up_write(&root
->snap_sem
);
2012 btrfs_btree_balance_dirty(root
, nr
);
2016 static unsigned long force_ra(struct address_space
*mapping
,
2017 struct file_ra_state
*ra
, struct file
*file
,
2018 pgoff_t offset
, pgoff_t last_index
)
2022 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2023 req_size
= last_index
- offset
+ 1;
2024 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2027 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2028 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2029 return offset
+ req_size
;
2033 int btrfs_defrag_file(struct file
*file
) {
2034 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2035 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
2037 unsigned long last_index
;
2038 unsigned long ra_index
= 0;
2043 mutex_lock(&inode
->i_mutex
);
2044 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2045 for (i
= 0; i
<= last_index
; i
++) {
2046 if (i
== ra_index
) {
2047 ra_index
= force_ra(inode
->i_mapping
, &file
->f_ra
,
2048 file
, ra_index
, last_index
);
2050 page
= grab_cache_page(inode
->i_mapping
, i
);
2053 if (!PageUptodate(page
)) {
2054 btrfs_readpage(NULL
, page
);
2056 if (!PageUptodate(page
)) {
2058 page_cache_release(page
);
2062 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
2063 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2065 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2066 set_extent_delalloc(em_tree
, page_start
,
2067 page_end
, GFP_NOFS
);
2068 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2069 set_page_dirty(page
);
2071 page_cache_release(page
);
2072 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2076 mutex_unlock(&inode
->i_mutex
);
2080 static int btrfs_ioctl_snap_create(struct btrfs_root
*root
, void __user
*arg
)
2082 struct btrfs_ioctl_vol_args vol_args
;
2083 struct btrfs_dir_item
*di
;
2084 struct btrfs_path
*path
;
2088 if (copy_from_user(&vol_args
, arg
, sizeof(vol_args
)))
2091 namelen
= strlen(vol_args
.name
);
2092 if (namelen
> BTRFS_VOL_NAME_MAX
)
2094 if (strchr(vol_args
.name
, '/'))
2097 path
= btrfs_alloc_path();
2101 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2102 mutex_lock(&root
->fs_info
->fs_mutex
);
2103 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2105 vol_args
.name
, namelen
, 0);
2106 mutex_unlock(&root
->fs_info
->fs_mutex
);
2107 btrfs_free_path(path
);
2108 if (di
&& !IS_ERR(di
))
2113 if (root
== root
->fs_info
->tree_root
)
2114 return create_subvol(root
, vol_args
.name
, namelen
);
2115 return create_snapshot(root
, vol_args
.name
, namelen
);
2118 static int btrfs_ioctl_defrag(struct file
*file
)
2120 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2121 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2123 switch (inode
->i_mode
& S_IFMT
) {
2125 mutex_lock(&root
->fs_info
->fs_mutex
);
2126 btrfs_defrag_root(root
, 0);
2127 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2128 mutex_unlock(&root
->fs_info
->fs_mutex
);
2131 btrfs_defrag_file(file
);
2138 long btrfs_ioctl(struct file
*file
, unsigned int
2139 cmd
, unsigned long arg
)
2141 struct btrfs_root
*root
= BTRFS_I(file
->f_path
.dentry
->d_inode
)->root
;
2144 case BTRFS_IOC_SNAP_CREATE
:
2145 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2146 case BTRFS_IOC_DEFRAG
:
2147 return btrfs_ioctl_defrag(file
);
2154 * Called inside transaction, so use GFP_NOFS
2156 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2158 struct btrfs_inode
*ei
;
2160 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2164 return &ei
->vfs_inode
;
2167 void btrfs_destroy_inode(struct inode
*inode
)
2169 WARN_ON(!list_empty(&inode
->i_dentry
));
2170 WARN_ON(inode
->i_data
.nrpages
);
2172 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2175 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2176 unsigned long flags
)
2178 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2180 inode_init_once(&ei
->vfs_inode
);
2183 void btrfs_destroy_cachep(void)
2185 if (btrfs_inode_cachep
)
2186 kmem_cache_destroy(btrfs_inode_cachep
);
2187 if (btrfs_trans_handle_cachep
)
2188 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2189 if (btrfs_transaction_cachep
)
2190 kmem_cache_destroy(btrfs_transaction_cachep
);
2191 if (btrfs_bit_radix_cachep
)
2192 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2193 if (btrfs_path_cachep
)
2194 kmem_cache_destroy(btrfs_path_cachep
);
2197 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2198 unsigned long extra_flags
,
2199 void (*ctor
)(void *, struct kmem_cache
*,
2202 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2203 SLAB_MEM_SPREAD
| extra_flags
), ctor
2204 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2210 int btrfs_init_cachep(void)
2212 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2213 sizeof(struct btrfs_inode
),
2215 if (!btrfs_inode_cachep
)
2217 btrfs_trans_handle_cachep
=
2218 btrfs_cache_create("btrfs_trans_handle_cache",
2219 sizeof(struct btrfs_trans_handle
),
2221 if (!btrfs_trans_handle_cachep
)
2223 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2224 sizeof(struct btrfs_transaction
),
2226 if (!btrfs_transaction_cachep
)
2228 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2229 sizeof(struct btrfs_path
),
2231 if (!btrfs_path_cachep
)
2233 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2234 SLAB_DESTROY_BY_RCU
, NULL
);
2235 if (!btrfs_bit_radix_cachep
)
2239 btrfs_destroy_cachep();
2243 static int btrfs_getattr(struct vfsmount
*mnt
,
2244 struct dentry
*dentry
, struct kstat
*stat
)
2246 struct inode
*inode
= dentry
->d_inode
;
2247 generic_fillattr(inode
, stat
);
2248 stat
->blksize
= 256 * 1024;
2252 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2253 struct inode
* new_dir
,struct dentry
*new_dentry
)
2255 struct btrfs_trans_handle
*trans
;
2256 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2257 struct inode
*new_inode
= new_dentry
->d_inode
;
2258 struct inode
*old_inode
= old_dentry
->d_inode
;
2259 struct timespec ctime
= CURRENT_TIME
;
2260 struct btrfs_path
*path
;
2261 struct btrfs_dir_item
*di
;
2264 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2265 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2269 mutex_lock(&root
->fs_info
->fs_mutex
);
2270 trans
= btrfs_start_transaction(root
, 1);
2272 btrfs_set_trans_block_group(trans
, new_dir
);
2273 path
= btrfs_alloc_path();
2279 old_dentry
->d_inode
->i_nlink
++;
2280 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2281 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2282 old_inode
->i_ctime
= ctime
;
2284 if (S_ISDIR(old_inode
->i_mode
) && old_dir
!= new_dir
) {
2285 struct btrfs_key
*location
= &BTRFS_I(new_dir
)->location
;
2286 struct btrfs_key old_parent_key
;
2287 di
= btrfs_lookup_dir_item(trans
, root
, path
, old_inode
->i_ino
,
2297 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &old_parent_key
);
2298 ret
= btrfs_del_item(trans
, root
, path
);
2302 btrfs_release_path(root
, path
);
2304 di
= btrfs_lookup_dir_index_item(trans
, root
, path
,
2306 old_parent_key
.objectid
,
2316 ret
= btrfs_del_item(trans
, root
, path
);
2320 btrfs_release_path(root
, path
);
2322 ret
= btrfs_insert_dir_item(trans
, root
, "..", 2,
2323 old_inode
->i_ino
, location
,
2330 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2335 new_inode
->i_ctime
= CURRENT_TIME
;
2336 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2340 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2345 btrfs_free_path(path
);
2346 btrfs_end_transaction(trans
, root
);
2347 mutex_unlock(&root
->fs_info
->fs_mutex
);
2351 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2352 const char *symname
)
2354 struct btrfs_trans_handle
*trans
;
2355 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2356 struct btrfs_path
*path
;
2357 struct btrfs_key key
;
2358 struct inode
*inode
;
2365 struct btrfs_file_extent_item
*ei
;
2366 struct extent_buffer
*leaf
;
2369 name_len
= strlen(symname
) + 1;
2370 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2371 return -ENAMETOOLONG
;
2372 mutex_lock(&root
->fs_info
->fs_mutex
);
2373 trans
= btrfs_start_transaction(root
, 1);
2374 btrfs_set_trans_block_group(trans
, dir
);
2376 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2382 inode
= btrfs_new_inode(trans
, root
, objectid
,
2383 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2384 err
= PTR_ERR(inode
);
2388 btrfs_set_trans_block_group(trans
, inode
);
2389 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2393 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2394 inode
->i_fop
= &btrfs_file_operations
;
2395 inode
->i_op
= &btrfs_file_inode_operations
;
2396 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
2397 inode
->i_mapping
, GFP_NOFS
);
2398 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
2400 dir
->i_sb
->s_dirt
= 1;
2401 btrfs_update_inode_block_group(trans
, inode
);
2402 btrfs_update_inode_block_group(trans
, dir
);
2406 path
= btrfs_alloc_path();
2408 key
.objectid
= inode
->i_ino
;
2410 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2411 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2412 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2418 leaf
= path
->nodes
[0];
2419 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2420 struct btrfs_file_extent_item
);
2421 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2422 btrfs_set_file_extent_type(leaf
, ei
,
2423 BTRFS_FILE_EXTENT_INLINE
);
2424 ptr
= btrfs_file_extent_inline_start(ei
);
2425 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
2426 btrfs_mark_buffer_dirty(leaf
);
2427 btrfs_free_path(path
);
2429 inode
->i_op
= &btrfs_symlink_inode_operations
;
2430 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2431 inode
->i_size
= name_len
- 1;
2432 err
= btrfs_update_inode(trans
, root
, inode
);
2437 nr
= trans
->blocks_used
;
2438 btrfs_end_transaction(trans
, root
);
2439 mutex_unlock(&root
->fs_info
->fs_mutex
);
2441 inode_dec_link_count(inode
);
2444 btrfs_btree_balance_dirty(root
, nr
);
2448 static struct inode_operations btrfs_dir_inode_operations
= {
2449 .lookup
= btrfs_lookup
,
2450 .create
= btrfs_create
,
2451 .unlink
= btrfs_unlink
,
2453 .mkdir
= btrfs_mkdir
,
2454 .rmdir
= btrfs_rmdir
,
2455 .rename
= btrfs_rename
,
2456 .symlink
= btrfs_symlink
,
2457 .setattr
= btrfs_setattr
,
2458 .mknod
= btrfs_mknod
,
2461 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2462 .lookup
= btrfs_lookup
,
2465 static struct file_operations btrfs_dir_file_operations
= {
2466 .llseek
= generic_file_llseek
,
2467 .read
= generic_read_dir
,
2468 .readdir
= btrfs_readdir
,
2469 .unlocked_ioctl
= btrfs_ioctl
,
2470 #ifdef CONFIG_COMPAT
2471 .compat_ioctl
= btrfs_ioctl
,
2475 static struct extent_map_ops btrfs_extent_map_ops
= {
2476 .fill_delalloc
= run_delalloc_range
,
2477 .writepage_io_hook
= btrfs_writepage_io_hook
,
2478 .readpage_io_hook
= btrfs_readpage_io_hook
,
2479 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2482 static struct address_space_operations btrfs_aops
= {
2483 .readpage
= btrfs_readpage
,
2484 .writepage
= btrfs_writepage
,
2485 .sync_page
= block_sync_page
,
2486 .prepare_write
= btrfs_prepare_write
,
2487 .commit_write
= btrfs_commit_write
,
2489 .invalidatepage
= btrfs_invalidatepage
,
2490 .releasepage
= btrfs_releasepage
,
2491 .set_page_dirty
= __set_page_dirty_nobuffers
,
2494 static struct address_space_operations btrfs_symlink_aops
= {
2495 .readpage
= btrfs_readpage
,
2496 .writepage
= btrfs_writepage
,
2497 .invalidatepage
= btrfs_invalidatepage
,
2498 .releasepage
= btrfs_releasepage
,
2501 static struct inode_operations btrfs_file_inode_operations
= {
2502 .truncate
= btrfs_truncate
,
2503 .getattr
= btrfs_getattr
,
2504 .setattr
= btrfs_setattr
,
2507 static struct inode_operations btrfs_special_inode_operations
= {
2508 .getattr
= btrfs_getattr
,
2509 .setattr
= btrfs_setattr
,
2512 static struct inode_operations btrfs_symlink_inode_operations
= {
2513 .readlink
= generic_readlink
,
2514 .follow_link
= page_follow_link_light
,
2515 .put_link
= page_put_link
,