2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
19 #include <linux/buffer_head.h>
21 #include <linux/pagemap.h>
22 #include <linux/highmem.h>
23 #include <linux/time.h>
24 #include <linux/init.h>
25 #include <linux/string.h>
26 #include <linux/smp_lock.h>
27 #include <linux/backing-dev.h>
28 #include <linux/mpage.h>
29 #include <linux/swap.h>
30 #include <linux/writeback.h>
31 #include <linux/statfs.h>
32 #include <linux/compat.h>
33 #include <linux/bit_spinlock.h>
34 #include <linux/version.h>
37 #include "transaction.h"
38 #include "btrfs_inode.h"
40 #include "print-tree.h"
42 struct btrfs_iget_args
{
44 struct btrfs_root
*root
;
47 static struct inode_operations btrfs_dir_inode_operations
;
48 static struct inode_operations btrfs_symlink_inode_operations
;
49 static struct inode_operations btrfs_dir_ro_inode_operations
;
50 static struct inode_operations btrfs_special_inode_operations
;
51 static struct inode_operations btrfs_file_inode_operations
;
52 static struct address_space_operations btrfs_aops
;
53 static struct address_space_operations btrfs_symlink_aops
;
54 static struct file_operations btrfs_dir_file_operations
;
55 static struct extent_map_ops btrfs_extent_map_ops
;
57 static struct kmem_cache
*btrfs_inode_cachep
;
58 struct kmem_cache
*btrfs_trans_handle_cachep
;
59 struct kmem_cache
*btrfs_transaction_cachep
;
60 struct kmem_cache
*btrfs_bit_radix_cachep
;
61 struct kmem_cache
*btrfs_path_cachep
;
64 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
65 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
66 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
67 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
68 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
69 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
70 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
71 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
74 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
76 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
77 struct btrfs_trans_handle
*trans
;
82 u64 blocksize
= 1 << inode
->i_blkbits
;
84 mutex_lock(&root
->fs_info
->fs_mutex
);
85 trans
= btrfs_start_transaction(root
, 1);
86 btrfs_set_trans_block_group(trans
, inode
);
88 num_blocks
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
89 ret
= btrfs_drop_extents(trans
, root
, inode
,
90 start
, start
+ num_blocks
, &alloc_hint
);
91 num_blocks
= num_blocks
>> inode
->i_blkbits
;
92 ret
= btrfs_alloc_extent(trans
, root
, inode
->i_ino
, num_blocks
, 0,
93 alloc_hint
, (u64
)-1, &ins
, 1);
98 ret
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
99 start
, ins
.objectid
, ins
.offset
,
102 btrfs_end_transaction(trans
, root
);
103 mutex_unlock(&root
->fs_info
->fs_mutex
);
107 int btrfs_writepage_io_hook(struct page
*page
, u64 start
, u64 end
)
109 struct inode
*inode
= page
->mapping
->host
;
110 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
111 struct btrfs_trans_handle
*trans
;
114 u64 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
115 size_t offset
= start
- page_start
;
117 mutex_lock(&root
->fs_info
->fs_mutex
);
118 trans
= btrfs_start_transaction(root
, 1);
119 btrfs_set_trans_block_group(trans
, inode
);
121 btrfs_csum_file_block(trans
, root
, inode
->i_ino
,
122 start
, kaddr
+ offset
, end
- start
+ 1);
124 ret
= btrfs_end_transaction(trans
, root
);
126 mutex_unlock(&root
->fs_info
->fs_mutex
);
130 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
133 struct inode
*inode
= page
->mapping
->host
;
134 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
135 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
136 struct btrfs_csum_item
*item
;
137 struct btrfs_path
*path
= NULL
;
140 mutex_lock(&root
->fs_info
->fs_mutex
);
141 path
= btrfs_alloc_path();
142 item
= btrfs_lookup_csum(NULL
, root
, path
, inode
->i_ino
, start
, 0);
145 /* a csum that isn't present is a preallocated region. */
146 if (ret
== -ENOENT
|| ret
== -EFBIG
)
151 memcpy((char *)&private, &item
->csum
, BTRFS_CRC32_SIZE
);
152 set_state_private(em_tree
, start
, private);
155 btrfs_free_path(path
);
156 mutex_unlock(&root
->fs_info
->fs_mutex
);
160 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
)
162 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); flush_dcache_page(page
);
190 kunmap_atomic(kaddr
, KM_IRQ0
);
194 void btrfs_read_locked_inode(struct inode
*inode
)
196 struct btrfs_path
*path
;
197 struct extent_buffer
*leaf
;
198 struct btrfs_inode_item
*inode_item
;
199 struct btrfs_inode_timespec
*tspec
;
200 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
201 struct btrfs_key location
;
202 u64 alloc_group_block
;
206 path
= btrfs_alloc_path();
208 mutex_lock(&root
->fs_info
->fs_mutex
);
210 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
211 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
215 leaf
= path
->nodes
[0];
216 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
217 struct btrfs_inode_item
);
219 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
220 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
221 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
222 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
223 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
225 tspec
= btrfs_inode_atime(inode_item
);
226 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
227 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
229 tspec
= btrfs_inode_mtime(inode_item
);
230 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
231 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
233 tspec
= btrfs_inode_ctime(inode_item
);
234 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
235 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
237 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
238 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
240 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
242 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
243 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
246 btrfs_free_path(path
);
249 mutex_unlock(&root
->fs_info
->fs_mutex
);
251 switch (inode
->i_mode
& S_IFMT
) {
253 inode
->i_mapping
->a_ops
= &btrfs_aops
;
254 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
255 inode
->i_fop
= &btrfs_file_operations
;
256 inode
->i_op
= &btrfs_file_inode_operations
;
259 inode
->i_fop
= &btrfs_dir_file_operations
;
260 if (root
== root
->fs_info
->tree_root
)
261 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
263 inode
->i_op
= &btrfs_dir_inode_operations
;
266 inode
->i_op
= &btrfs_symlink_inode_operations
;
267 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
270 init_special_inode(inode
, inode
->i_mode
, rdev
);
276 btrfs_release_path(root
, path
);
277 btrfs_free_path(path
);
278 mutex_unlock(&root
->fs_info
->fs_mutex
);
279 make_bad_inode(inode
);
282 static void fill_inode_item(struct extent_buffer
*leaf
,
283 struct btrfs_inode_item
*item
,
286 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
287 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
288 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
289 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
290 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
292 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
293 inode
->i_atime
.tv_sec
);
294 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
295 inode
->i_atime
.tv_nsec
);
297 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
298 inode
->i_mtime
.tv_sec
);
299 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
300 inode
->i_mtime
.tv_nsec
);
302 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
303 inode
->i_ctime
.tv_sec
);
304 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
305 inode
->i_ctime
.tv_nsec
);
307 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
308 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
309 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
310 btrfs_set_inode_block_group(leaf
, item
,
311 BTRFS_I(inode
)->block_group
->key
.objectid
);
314 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
315 struct btrfs_root
*root
,
318 struct btrfs_inode_item
*inode_item
;
319 struct btrfs_path
*path
;
320 struct extent_buffer
*leaf
;
323 path
= btrfs_alloc_path();
325 ret
= btrfs_lookup_inode(trans
, root
, path
,
326 &BTRFS_I(inode
)->location
, 1);
333 leaf
= path
->nodes
[0];
334 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
335 struct btrfs_inode_item
);
337 fill_inode_item(leaf
, inode_item
, inode
);
338 btrfs_mark_buffer_dirty(leaf
);
339 btrfs_set_inode_last_trans(trans
, inode
);
342 btrfs_release_path(root
, path
);
343 btrfs_free_path(path
);
348 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
349 struct btrfs_root
*root
,
351 struct dentry
*dentry
)
353 struct btrfs_path
*path
;
354 const char *name
= dentry
->d_name
.name
;
355 int name_len
= dentry
->d_name
.len
;
357 struct extent_buffer
*leaf
;
358 struct btrfs_dir_item
*di
;
359 struct btrfs_key key
;
361 path
= btrfs_alloc_path();
367 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
377 leaf
= path
->nodes
[0];
378 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
379 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
382 btrfs_release_path(root
, path
);
384 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
385 key
.objectid
, name
, name_len
, -1);
394 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
396 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
398 btrfs_free_path(path
);
400 dir
->i_size
-= name_len
* 2;
401 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
402 btrfs_update_inode(trans
, root
, dir
);
403 drop_nlink(dentry
->d_inode
);
404 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
405 dir
->i_sb
->s_dirt
= 1;
410 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
412 struct btrfs_root
*root
;
413 struct btrfs_trans_handle
*trans
;
417 root
= BTRFS_I(dir
)->root
;
418 mutex_lock(&root
->fs_info
->fs_mutex
);
419 trans
= btrfs_start_transaction(root
, 1);
421 btrfs_set_trans_block_group(trans
, dir
);
422 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
423 nr
= trans
->blocks_used
;
425 btrfs_end_transaction(trans
, root
);
426 mutex_unlock(&root
->fs_info
->fs_mutex
);
427 btrfs_btree_balance_dirty(root
, nr
);
432 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
434 struct inode
*inode
= dentry
->d_inode
;
437 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
438 struct btrfs_path
*path
;
439 struct btrfs_key key
;
440 struct btrfs_trans_handle
*trans
;
441 struct btrfs_key found_key
;
443 struct extent_buffer
*leaf
;
444 char *goodnames
= "..";
447 path
= btrfs_alloc_path();
449 mutex_lock(&root
->fs_info
->fs_mutex
);
450 trans
= btrfs_start_transaction(root
, 1);
452 btrfs_set_trans_block_group(trans
, dir
);
453 key
.objectid
= inode
->i_ino
;
454 key
.offset
= (u64
)-1;
457 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
463 if (path
->slots
[0] == 0) {
468 leaf
= path
->nodes
[0];
469 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
470 found_type
= btrfs_key_type(&found_key
);
471 if (found_key
.objectid
!= inode
->i_ino
) {
475 if ((found_type
!= BTRFS_DIR_ITEM_KEY
&&
476 found_type
!= BTRFS_DIR_INDEX_KEY
) ||
477 (!btrfs_match_dir_item_name(root
, path
, goodnames
, 2) &&
478 !btrfs_match_dir_item_name(root
, path
, goodnames
, 1))) {
482 ret
= btrfs_del_item(trans
, root
, path
);
485 if (found_type
== BTRFS_DIR_ITEM_KEY
&& found_key
.offset
== 1)
487 btrfs_release_path(root
, path
);
490 btrfs_release_path(root
, path
);
492 /* now the directory is empty */
493 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
498 btrfs_release_path(root
, path
);
499 btrfs_free_path(path
);
500 mutex_unlock(&root
->fs_info
->fs_mutex
);
501 nr
= trans
->blocks_used
;
502 ret
= btrfs_end_transaction(trans
, root
);
503 btrfs_btree_balance_dirty(root
, nr
);
509 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
510 struct btrfs_root
*root
,
513 struct btrfs_path
*path
;
518 path
= btrfs_alloc_path();
520 ret
= btrfs_lookup_inode(trans
, root
, path
,
521 &BTRFS_I(inode
)->location
, -1);
525 ret
= btrfs_del_item(trans
, root
, path
);
526 btrfs_free_path(path
);
531 * this can truncate away extent items, csum items and directory items.
532 * It starts at a high offset and removes keys until it can't find
533 * any higher than i_size.
535 * csum items that cross the new i_size are truncated to the new size
538 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
539 struct btrfs_root
*root
,
543 struct btrfs_path
*path
;
544 struct btrfs_key key
;
545 struct btrfs_key found_key
;
547 struct extent_buffer
*leaf
;
548 struct btrfs_file_extent_item
*fi
;
549 u64 extent_start
= 0;
550 u64 extent_num_blocks
= 0;
555 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
556 path
= btrfs_alloc_path();
560 /* FIXME, add redo link to tree so we don't leak on crash */
561 key
.objectid
= inode
->i_ino
;
562 key
.offset
= (u64
)-1;
566 btrfs_init_path(path
);
568 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
573 BUG_ON(path
->slots
[0] == 0);
576 leaf
= path
->nodes
[0];
577 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
578 found_type
= btrfs_key_type(&found_key
);
580 if (found_key
.objectid
!= inode
->i_ino
)
583 if (found_type
!= BTRFS_CSUM_ITEM_KEY
&&
584 found_type
!= BTRFS_DIR_ITEM_KEY
&&
585 found_type
!= BTRFS_DIR_INDEX_KEY
&&
586 found_type
!= BTRFS_EXTENT_DATA_KEY
)
589 item_end
= found_key
.offset
;
590 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
591 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
592 struct btrfs_file_extent_item
);
593 if (btrfs_file_extent_type(leaf
, fi
) !=
594 BTRFS_FILE_EXTENT_INLINE
) {
596 btrfs_file_extent_num_blocks(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_blocknr(leaf
, fi
);
631 u64 orig_num_blocks
=
632 btrfs_file_extent_num_blocks(leaf
, fi
);
633 extent_num_blocks
= inode
->i_size
-
634 found_key
.offset
+ root
->sectorsize
- 1;
635 extent_num_blocks
>>= inode
->i_blkbits
;
636 btrfs_set_file_extent_num_blocks(leaf
, fi
,
638 num_dec
= (orig_num_blocks
-
639 extent_num_blocks
) << 3;
640 if (extent_start
!= 0) {
641 inode
->i_blocks
-= num_dec
;
643 btrfs_mark_buffer_dirty(leaf
);
646 btrfs_file_extent_disk_num_blocks(leaf
,
648 /* FIXME blocksize != 4096 */
649 num_dec
= btrfs_file_extent_num_blocks(leaf
,
651 if (extent_start
!= 0) {
653 inode
->i_blocks
-= num_dec
;
658 ret
= btrfs_del_item(trans
, root
, path
);
664 btrfs_release_path(root
, path
);
666 ret
= btrfs_free_extent(trans
, root
, extent_start
,
667 extent_num_blocks
, 0);
673 btrfs_release_path(root
, path
);
674 btrfs_free_path(path
);
675 inode
->i_sb
->s_dirt
= 1;
679 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
684 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
685 u64 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
686 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
688 set_page_extent_mapped(page
);
690 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
691 set_extent_delalloc(&BTRFS_I(inode
)->extent_tree
, page_start
,
693 if (zero_start
!= PAGE_CACHE_SIZE
) {
695 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
696 flush_dcache_page(page
);
699 set_page_dirty(page
);
700 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
706 * taken from block_truncate_page, but does cow as it zeros out
707 * any bytes left in the last page in the file.
709 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
711 struct inode
*inode
= mapping
->host
;
712 unsigned blocksize
= 1 << inode
->i_blkbits
;
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(&BTRFS_I(inode
)->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 hole_size
>>= inode
->i_blkbits
;
783 err
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
784 pos
, 0, 0, hole_size
);
785 btrfs_end_transaction(trans
, root
);
786 mutex_unlock(&root
->fs_info
->fs_mutex
);
787 unlock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
792 err
= inode_setattr(inode
, attr
);
796 void btrfs_delete_inode(struct inode
*inode
)
798 struct btrfs_trans_handle
*trans
;
799 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
803 truncate_inode_pages(&inode
->i_data
, 0);
804 if (is_bad_inode(inode
)) {
809 mutex_lock(&root
->fs_info
->fs_mutex
);
810 trans
= btrfs_start_transaction(root
, 1);
812 btrfs_set_trans_block_group(trans
, inode
);
813 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
816 ret
= btrfs_free_inode(trans
, root
, inode
);
819 nr
= trans
->blocks_used
;
821 btrfs_end_transaction(trans
, root
);
822 mutex_unlock(&root
->fs_info
->fs_mutex
);
823 btrfs_btree_balance_dirty(root
, nr
);
827 nr
= trans
->blocks_used
;
828 btrfs_end_transaction(trans
, root
);
829 mutex_unlock(&root
->fs_info
->fs_mutex
);
830 btrfs_btree_balance_dirty(root
, nr
);
836 * this returns the key found in the dir entry in the location pointer.
837 * If no dir entries were found, location->objectid is 0.
839 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
840 struct btrfs_key
*location
)
842 const char *name
= dentry
->d_name
.name
;
843 int namelen
= dentry
->d_name
.len
;
844 struct btrfs_dir_item
*di
;
845 struct btrfs_path
*path
;
846 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
849 path
= btrfs_alloc_path();
851 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
853 if (!di
|| IS_ERR(di
)) {
854 location
->objectid
= 0;
858 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
860 btrfs_release_path(root
, path
);
861 btrfs_free_path(path
);
866 * when we hit a tree root in a directory, the btrfs part of the inode
867 * needs to be changed to reflect the root directory of the tree root. This
868 * is kind of like crossing a mount point.
870 static int fixup_tree_root_location(struct btrfs_root
*root
,
871 struct btrfs_key
*location
,
872 struct btrfs_root
**sub_root
,
873 struct dentry
*dentry
)
875 struct btrfs_path
*path
;
876 struct btrfs_root_item
*ri
;
878 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
880 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
883 path
= btrfs_alloc_path();
885 mutex_lock(&root
->fs_info
->fs_mutex
);
887 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
890 if (IS_ERR(*sub_root
))
891 return PTR_ERR(*sub_root
);
893 ri
= &(*sub_root
)->root_item
;
894 location
->objectid
= btrfs_root_dirid(ri
);
895 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
896 location
->offset
= 0;
898 btrfs_free_path(path
);
899 mutex_unlock(&root
->fs_info
->fs_mutex
);
903 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
905 struct btrfs_iget_args
*args
= p
;
906 inode
->i_ino
= args
->ino
;
907 BTRFS_I(inode
)->root
= args
->root
;
908 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
909 inode
->i_mapping
, GFP_NOFS
);
913 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
915 struct btrfs_iget_args
*args
= opaque
;
916 return (args
->ino
== inode
->i_ino
&&
917 args
->root
== BTRFS_I(inode
)->root
);
920 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
921 struct btrfs_root
*root
)
924 struct btrfs_iget_args args
;
928 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
929 btrfs_init_locked_inode
,
934 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
935 struct nameidata
*nd
)
937 struct inode
* inode
;
938 struct btrfs_inode
*bi
= BTRFS_I(dir
);
939 struct btrfs_root
*root
= bi
->root
;
940 struct btrfs_root
*sub_root
= root
;
941 struct btrfs_key location
;
944 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
945 return ERR_PTR(-ENAMETOOLONG
);
947 mutex_lock(&root
->fs_info
->fs_mutex
);
948 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
949 mutex_unlock(&root
->fs_info
->fs_mutex
);
955 if (location
.objectid
) {
956 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
961 return ERR_PTR(-ENOENT
);
962 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
965 return ERR_PTR(-EACCES
);
966 if (inode
->i_state
& I_NEW
) {
967 /* the inode and parent dir are two different roots */
968 if (sub_root
!= root
) {
970 sub_root
->inode
= inode
;
972 BTRFS_I(inode
)->root
= sub_root
;
973 memcpy(&BTRFS_I(inode
)->location
, &location
,
975 btrfs_read_locked_inode(inode
);
976 unlock_new_inode(inode
);
979 return d_splice_alias(inode
, dentry
);
982 static unsigned char btrfs_filetype_table
[] = {
983 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
986 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
988 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
989 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
990 struct btrfs_item
*item
;
991 struct btrfs_dir_item
*di
;
992 struct btrfs_key key
;
993 struct btrfs_key found_key
;
994 struct btrfs_path
*path
;
997 struct extent_buffer
*leaf
;
1000 unsigned char d_type
;
1005 int key_type
= BTRFS_DIR_INDEX_KEY
;
1010 /* FIXME, use a real flag for deciding about the key type */
1011 if (root
->fs_info
->tree_root
== root
)
1012 key_type
= BTRFS_DIR_ITEM_KEY
;
1014 mutex_lock(&root
->fs_info
->fs_mutex
);
1015 key
.objectid
= inode
->i_ino
;
1016 btrfs_set_key_type(&key
, key_type
);
1017 key
.offset
= filp
->f_pos
;
1019 path
= btrfs_alloc_path();
1021 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1026 leaf
= path
->nodes
[0];
1027 nritems
= btrfs_header_nritems(leaf
);
1028 slot
= path
->slots
[0];
1029 if (advance
|| slot
>= nritems
) {
1030 if (slot
>= nritems
-1) {
1031 ret
= btrfs_next_leaf(root
, path
);
1034 leaf
= path
->nodes
[0];
1035 nritems
= btrfs_header_nritems(leaf
);
1036 slot
= path
->slots
[0];
1043 item
= btrfs_item_nr(leaf
, slot
);
1044 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1046 if (found_key
.objectid
!= key
.objectid
)
1048 if (btrfs_key_type(&found_key
) != key_type
)
1050 if (found_key
.offset
< filp
->f_pos
)
1053 filp
->f_pos
= found_key
.offset
;
1055 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1057 di_total
= btrfs_item_size(leaf
, item
);
1058 while(di_cur
< di_total
) {
1059 struct btrfs_key location
;
1061 name_len
= btrfs_dir_name_len(leaf
, di
);
1062 if (name_len
< 32) {
1063 name_ptr
= tmp_name
;
1065 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1068 read_extent_buffer(leaf
, name_ptr
,
1069 (unsigned long)(di
+ 1), name_len
);
1071 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1072 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1074 over
= filldir(dirent
, name_ptr
, name_len
,
1079 if (name_ptr
!= tmp_name
)
1084 di_len
= btrfs_dir_name_len(leaf
, di
) + sizeof(*di
);
1086 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1093 btrfs_release_path(root
, path
);
1094 btrfs_free_path(path
);
1095 mutex_unlock(&root
->fs_info
->fs_mutex
);
1099 int btrfs_write_inode(struct inode
*inode
, int wait
)
1101 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1102 struct btrfs_trans_handle
*trans
;
1106 mutex_lock(&root
->fs_info
->fs_mutex
);
1107 trans
= btrfs_start_transaction(root
, 1);
1108 btrfs_set_trans_block_group(trans
, inode
);
1109 ret
= btrfs_commit_transaction(trans
, root
);
1110 mutex_unlock(&root
->fs_info
->fs_mutex
);
1116 * This is somewhat expensive, updating the tree every time the
1117 * inode changes. But, it is most likely to find the inode in cache.
1118 * FIXME, needs more benchmarking...there are no reasons other than performance
1119 * to keep or drop this code.
1121 void btrfs_dirty_inode(struct inode
*inode
)
1123 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1124 struct btrfs_trans_handle
*trans
;
1126 mutex_lock(&root
->fs_info
->fs_mutex
);
1127 trans
= btrfs_start_transaction(root
, 1);
1128 btrfs_set_trans_block_group(trans
, inode
);
1129 btrfs_update_inode(trans
, root
, inode
);
1130 btrfs_end_transaction(trans
, root
);
1131 mutex_unlock(&root
->fs_info
->fs_mutex
);
1134 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1135 struct btrfs_root
*root
,
1137 struct btrfs_block_group_cache
*group
,
1140 struct inode
*inode
;
1141 struct btrfs_inode_item
*inode_item
;
1142 struct btrfs_key
*location
;
1143 struct btrfs_path
*path
;
1147 path
= btrfs_alloc_path();
1150 inode
= new_inode(root
->fs_info
->sb
);
1152 return ERR_PTR(-ENOMEM
);
1154 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1155 inode
->i_mapping
, GFP_NOFS
);
1156 BTRFS_I(inode
)->root
= root
;
1162 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1163 BTRFS_I(inode
)->block_group
= group
;
1165 ret
= btrfs_insert_empty_inode(trans
, root
, path
, objectid
);
1169 inode
->i_uid
= current
->fsuid
;
1170 inode
->i_gid
= current
->fsgid
;
1171 inode
->i_mode
= mode
;
1172 inode
->i_ino
= objectid
;
1173 inode
->i_blocks
= 0;
1174 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1175 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1176 struct btrfs_inode_item
);
1177 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1178 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1179 btrfs_free_path(path
);
1181 location
= &BTRFS_I(inode
)->location
;
1182 location
->objectid
= objectid
;
1183 location
->offset
= 0;
1184 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1186 insert_inode_hash(inode
);
1189 btrfs_free_path(path
);
1190 return ERR_PTR(ret
);
1193 static inline u8
btrfs_inode_type(struct inode
*inode
)
1195 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1198 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1199 struct dentry
*dentry
, struct inode
*inode
)
1202 struct btrfs_key key
;
1203 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1204 struct inode
*parent_inode
;
1206 key
.objectid
= inode
->i_ino
;
1207 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1210 ret
= btrfs_insert_dir_item(trans
, root
,
1211 dentry
->d_name
.name
, dentry
->d_name
.len
,
1212 dentry
->d_parent
->d_inode
->i_ino
,
1213 &key
, btrfs_inode_type(inode
));
1215 parent_inode
= dentry
->d_parent
->d_inode
;
1216 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1217 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1218 ret
= btrfs_update_inode(trans
, root
,
1219 dentry
->d_parent
->d_inode
);
1224 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1225 struct dentry
*dentry
, struct inode
*inode
)
1227 int err
= btrfs_add_link(trans
, dentry
, inode
);
1229 d_instantiate(dentry
, inode
);
1237 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1238 int mode
, dev_t rdev
)
1240 struct btrfs_trans_handle
*trans
;
1241 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1242 struct inode
*inode
;
1248 if (!new_valid_dev(rdev
))
1251 mutex_lock(&root
->fs_info
->fs_mutex
);
1252 trans
= btrfs_start_transaction(root
, 1);
1253 btrfs_set_trans_block_group(trans
, dir
);
1255 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1261 inode
= btrfs_new_inode(trans
, root
, objectid
,
1262 BTRFS_I(dir
)->block_group
, mode
);
1263 err
= PTR_ERR(inode
);
1267 btrfs_set_trans_block_group(trans
, inode
);
1268 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1272 inode
->i_op
= &btrfs_special_inode_operations
;
1273 init_special_inode(inode
, inode
->i_mode
, rdev
);
1274 btrfs_update_inode(trans
, root
, inode
);
1276 dir
->i_sb
->s_dirt
= 1;
1277 btrfs_update_inode_block_group(trans
, inode
);
1278 btrfs_update_inode_block_group(trans
, dir
);
1280 nr
= trans
->blocks_used
;
1281 btrfs_end_transaction(trans
, root
);
1282 mutex_unlock(&root
->fs_info
->fs_mutex
);
1285 inode_dec_link_count(inode
);
1288 btrfs_btree_balance_dirty(root
, nr
);
1292 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1293 int mode
, struct nameidata
*nd
)
1295 struct btrfs_trans_handle
*trans
;
1296 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1297 struct inode
*inode
;
1303 mutex_lock(&root
->fs_info
->fs_mutex
);
1304 trans
= btrfs_start_transaction(root
, 1);
1305 btrfs_set_trans_block_group(trans
, dir
);
1307 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1313 inode
= btrfs_new_inode(trans
, root
, objectid
,
1314 BTRFS_I(dir
)->block_group
, mode
);
1315 err
= PTR_ERR(inode
);
1319 btrfs_set_trans_block_group(trans
, inode
);
1320 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1324 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1325 inode
->i_fop
= &btrfs_file_operations
;
1326 inode
->i_op
= &btrfs_file_inode_operations
;
1327 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1328 inode
->i_mapping
, GFP_NOFS
);
1329 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
1331 dir
->i_sb
->s_dirt
= 1;
1332 btrfs_update_inode_block_group(trans
, inode
);
1333 btrfs_update_inode_block_group(trans
, dir
);
1335 nr
= trans
->blocks_used
;
1336 btrfs_end_transaction(trans
, root
);
1337 mutex_unlock(&root
->fs_info
->fs_mutex
);
1340 inode_dec_link_count(inode
);
1343 btrfs_btree_balance_dirty(root
, nr
);
1347 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1348 struct dentry
*dentry
)
1350 struct btrfs_trans_handle
*trans
;
1351 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1352 struct inode
*inode
= old_dentry
->d_inode
;
1357 if (inode
->i_nlink
== 0)
1361 mutex_lock(&root
->fs_info
->fs_mutex
);
1362 trans
= btrfs_start_transaction(root
, 1);
1364 btrfs_set_trans_block_group(trans
, dir
);
1365 atomic_inc(&inode
->i_count
);
1366 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1371 dir
->i_sb
->s_dirt
= 1;
1372 btrfs_update_inode_block_group(trans
, dir
);
1373 err
= btrfs_update_inode(trans
, root
, inode
);
1378 nr
= trans
->blocks_used
;
1379 btrfs_end_transaction(trans
, root
);
1380 mutex_unlock(&root
->fs_info
->fs_mutex
);
1383 inode_dec_link_count(inode
);
1386 btrfs_btree_balance_dirty(root
, nr
);
1390 static int btrfs_make_empty_dir(struct btrfs_trans_handle
*trans
,
1391 struct btrfs_root
*root
,
1392 u64 objectid
, u64 dirid
)
1396 struct btrfs_key key
;
1401 key
.objectid
= objectid
;
1403 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1405 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 1, objectid
,
1406 &key
, BTRFS_FT_DIR
);
1410 key
.objectid
= dirid
;
1411 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 2, objectid
,
1412 &key
, BTRFS_FT_DIR
);
1419 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1421 struct inode
*inode
;
1422 struct btrfs_trans_handle
*trans
;
1423 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1425 int drop_on_err
= 0;
1427 unsigned long nr
= 1;
1429 mutex_lock(&root
->fs_info
->fs_mutex
);
1430 trans
= btrfs_start_transaction(root
, 1);
1431 btrfs_set_trans_block_group(trans
, dir
);
1433 if (IS_ERR(trans
)) {
1434 err
= PTR_ERR(trans
);
1438 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1444 inode
= btrfs_new_inode(trans
, root
, objectid
,
1445 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1446 if (IS_ERR(inode
)) {
1447 err
= PTR_ERR(inode
);
1452 inode
->i_op
= &btrfs_dir_inode_operations
;
1453 inode
->i_fop
= &btrfs_dir_file_operations
;
1454 btrfs_set_trans_block_group(trans
, inode
);
1456 err
= btrfs_make_empty_dir(trans
, root
, inode
->i_ino
, dir
->i_ino
);
1461 err
= btrfs_update_inode(trans
, root
, inode
);
1465 err
= btrfs_add_link(trans
, dentry
, inode
);
1469 d_instantiate(dentry
, inode
);
1471 dir
->i_sb
->s_dirt
= 1;
1472 btrfs_update_inode_block_group(trans
, inode
);
1473 btrfs_update_inode_block_group(trans
, dir
);
1476 nr
= trans
->blocks_used
;
1477 btrfs_end_transaction(trans
, root
);
1480 mutex_unlock(&root
->fs_info
->fs_mutex
);
1483 btrfs_btree_balance_dirty(root
, nr
);
1487 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1488 size_t page_offset
, u64 start
, u64 end
,
1494 u64 extent_start
= 0;
1496 u64 objectid
= inode
->i_ino
;
1498 int failed_insert
= 0;
1499 struct btrfs_path
*path
;
1500 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1501 struct btrfs_file_extent_item
*item
;
1502 struct extent_buffer
*leaf
;
1503 struct btrfs_key found_key
;
1504 struct extent_map
*em
= NULL
;
1505 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1506 struct btrfs_trans_handle
*trans
= NULL
;
1508 path
= btrfs_alloc_path();
1510 mutex_lock(&root
->fs_info
->fs_mutex
);
1513 em
= lookup_extent_mapping(em_tree
, start
, end
);
1518 em
= alloc_extent_map(GFP_NOFS
);
1523 em
->start
= EXTENT_MAP_HOLE
;
1524 em
->end
= EXTENT_MAP_HOLE
;
1526 em
->bdev
= inode
->i_sb
->s_bdev
;
1527 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
1528 objectid
, start
, 0);
1535 if (path
->slots
[0] == 0)
1540 leaf
= path
->nodes
[0];
1541 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1542 struct btrfs_file_extent_item
);
1544 blocknr
= btrfs_file_extent_disk_blocknr(leaf
, item
);
1545 blocknr
+= btrfs_file_extent_offset(leaf
, item
);
1547 /* are we inside the extent that was found? */
1548 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1549 found_type
= btrfs_key_type(&found_key
);
1550 if (found_key
.objectid
!= objectid
||
1551 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1555 found_type
= btrfs_file_extent_type(leaf
, item
);
1556 extent_start
= found_key
.offset
;
1557 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1558 extent_end
= extent_start
+
1559 (btrfs_file_extent_num_blocks(leaf
, item
) <<
1562 if (start
< extent_start
|| start
>= extent_end
) {
1564 if (start
< extent_start
) {
1565 if (end
< extent_start
)
1567 em
->end
= extent_end
- 1;
1573 if (btrfs_file_extent_disk_blocknr(leaf
, item
) == 0) {
1574 em
->start
= extent_start
;
1575 em
->end
= extent_end
- 1;
1576 em
->block_start
= EXTENT_MAP_HOLE
;
1577 em
->block_end
= EXTENT_MAP_HOLE
;
1580 em
->block_start
= blocknr
<< inode
->i_blkbits
;
1581 em
->block_end
= em
->block_start
+
1582 (btrfs_file_extent_num_blocks(leaf
, item
) <<
1583 inode
->i_blkbits
) - 1;
1584 em
->start
= extent_start
;
1585 em
->end
= extent_end
- 1;
1587 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1592 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
1595 extent_end
= extent_start
| ((u64
)root
->sectorsize
- 1);
1596 if (start
< extent_start
|| start
>= extent_end
) {
1598 if (start
< extent_start
) {
1599 if (end
< extent_start
)
1601 em
->end
= extent_end
;
1608 em
->block_start
= EXTENT_MAP_INLINE
;
1609 em
->block_end
= EXTENT_MAP_INLINE
;
1610 em
->start
= extent_start
;
1611 em
->end
= extent_end
;
1617 ptr
= btrfs_file_extent_inline_start(item
);
1619 read_extent_buffer(leaf
, map
+ page_offset
, ptr
, size
);
1620 memset(map
+ page_offset
+ size
, 0,
1621 root
->sectorsize
- (page_offset
+ size
));
1622 flush_dcache_page(page
);
1624 set_extent_uptodate(em_tree
, extent_start
,
1625 extent_end
, GFP_NOFS
);
1628 printk("unkknown found_type %d\n", found_type
);
1635 em
->block_start
= EXTENT_MAP_HOLE
;
1636 em
->block_end
= EXTENT_MAP_HOLE
;
1638 btrfs_release_path(root
, path
);
1639 if (em
->start
> start
|| em
->end
< start
) {
1640 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->end
, start
, end
);
1644 ret
= add_extent_mapping(em_tree
, em
);
1645 if (ret
== -EEXIST
) {
1646 free_extent_map(em
);
1649 if (failed_insert
> 5) {
1650 printk("failing to insert %Lu %Lu\n", start
, end
);
1658 btrfs_free_path(path
);
1660 ret
= btrfs_end_transaction(trans
, root
);
1664 mutex_unlock(&root
->fs_info
->fs_mutex
);
1666 free_extent_map(em
);
1668 return ERR_PTR(err
);
1673 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
1675 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
1678 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1679 unsigned from
, unsigned to
)
1681 return extent_prepare_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1682 page
->mapping
->host
, page
, from
, to
,
1686 int btrfs_readpage(struct file
*file
, struct page
*page
)
1688 struct extent_map_tree
*tree
;
1689 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1690 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
1692 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1694 struct extent_map_tree
*tree
;
1697 if (current
->flags
& PF_MEMALLOC
) {
1698 redirty_page_for_writepage(wbc
, page
);
1702 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1703 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
1706 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
1708 struct extent_map_tree
*tree
;
1711 if (page
->private != 1) {
1713 return try_to_free_buffers(page
);
1715 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1716 ret
= try_release_extent_mapping(tree
, page
);
1718 ClearPagePrivate(page
);
1719 set_page_private(page
, 0);
1720 page_cache_release(page
);
1725 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
1727 struct extent_map_tree
*tree
;
1729 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1730 extent_invalidatepage(tree
, page
, offset
);
1731 btrfs_releasepage(page
, GFP_NOFS
);
1735 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1736 * called from a page fault handler when a page is first dirtied. Hence we must
1737 * be careful to check for EOF conditions here. We set the page up correctly
1738 * for a written page which means we get ENOSPC checking when writing into
1739 * holes and correct delalloc and unwritten extent mapping on filesystems that
1740 * support these features.
1742 * We are not allowed to take the i_mutex here so we have to play games to
1743 * protect against truncate races as the page could now be beyond EOF. Because
1744 * vmtruncate() writes the inode size before removing pages, once we have the
1745 * page lock we can determine safely if the page is beyond EOF. If it is not
1746 * beyond EOF, then the page is guaranteed safe against truncation until we
1749 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
1751 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
1757 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
1759 wait_on_page_writeback(page
);
1760 size
= i_size_read(inode
);
1761 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
1763 if ((page
->mapping
!= inode
->i_mapping
) ||
1764 (page_start
> size
)) {
1765 /* page got truncated out from underneath us */
1769 /* page is wholly or partially inside EOF */
1770 if (page_start
+ PAGE_CACHE_SIZE
> size
)
1771 end
= size
& ~PAGE_CACHE_MASK
;
1773 end
= PAGE_CACHE_SIZE
;
1775 ret
= btrfs_cow_one_page(inode
, page
, end
);
1778 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
1783 static void btrfs_truncate(struct inode
*inode
)
1785 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1787 struct btrfs_trans_handle
*trans
;
1790 if (!S_ISREG(inode
->i_mode
))
1792 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1795 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1797 mutex_lock(&root
->fs_info
->fs_mutex
);
1798 trans
= btrfs_start_transaction(root
, 1);
1799 btrfs_set_trans_block_group(trans
, inode
);
1801 /* FIXME, add redo link to tree so we don't leak on crash */
1802 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1803 btrfs_update_inode(trans
, root
, inode
);
1804 nr
= trans
->blocks_used
;
1806 ret
= btrfs_end_transaction(trans
, root
);
1808 mutex_unlock(&root
->fs_info
->fs_mutex
);
1809 btrfs_btree_balance_dirty(root
, nr
);
1812 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1813 unsigned from
, unsigned to
)
1815 return extent_commit_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1816 page
->mapping
->host
, page
, from
, to
);
1819 static int create_subvol(struct btrfs_root
*root
, char *name
, int namelen
)
1821 struct btrfs_trans_handle
*trans
;
1822 struct btrfs_key key
;
1823 struct btrfs_root_item root_item
;
1824 struct btrfs_inode_item
*inode_item
;
1825 struct extent_buffer
*leaf
;
1826 struct btrfs_root
*new_root
;
1827 struct inode
*inode
;
1832 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
1833 unsigned long nr
= 1;
1835 mutex_lock(&root
->fs_info
->fs_mutex
);
1836 trans
= btrfs_start_transaction(root
, 1);
1839 leaf
= btrfs_alloc_free_block(trans
, root
, 0, 0);
1841 return PTR_ERR(leaf
);
1843 btrfs_set_header_nritems(leaf
, 0);
1844 btrfs_set_header_level(leaf
, 0);
1845 btrfs_set_header_blocknr(leaf
, extent_buffer_blocknr(leaf
));
1846 btrfs_set_header_generation(leaf
, trans
->transid
);
1847 btrfs_set_header_owner(leaf
, root
->root_key
.objectid
);
1848 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
1849 (unsigned long)btrfs_header_fsid(leaf
),
1851 btrfs_mark_buffer_dirty(leaf
);
1853 inode_item
= &root_item
.inode
;
1854 memset(inode_item
, 0, sizeof(*inode_item
));
1855 inode_item
->generation
= cpu_to_le64(1);
1856 inode_item
->size
= cpu_to_le64(3);
1857 inode_item
->nlink
= cpu_to_le32(1);
1858 inode_item
->nblocks
= cpu_to_le64(1);
1859 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
1861 btrfs_set_root_blocknr(&root_item
, extent_buffer_blocknr(leaf
));
1862 btrfs_set_root_refs(&root_item
, 1);
1863 btrfs_set_root_used(&root_item
, 0);
1865 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
1866 root_item
.drop_level
= 0;
1868 free_extent_buffer(leaf
);
1871 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1876 btrfs_set_root_dirid(&root_item
, new_dirid
);
1878 key
.objectid
= objectid
;
1880 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1881 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1887 * insert the directory item
1889 key
.offset
= (u64
)-1;
1890 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
1891 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1892 name
, namelen
, dir
->i_ino
, &key
,
1897 ret
= btrfs_commit_transaction(trans
, root
);
1901 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
1904 trans
= btrfs_start_transaction(new_root
, 1);
1907 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
1908 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
1911 inode
->i_op
= &btrfs_dir_inode_operations
;
1912 inode
->i_fop
= &btrfs_dir_file_operations
;
1913 new_root
->inode
= inode
;
1915 ret
= btrfs_make_empty_dir(trans
, new_root
, new_dirid
, new_dirid
);
1921 ret
= btrfs_update_inode(trans
, new_root
, inode
);
1925 nr
= trans
->blocks_used
;
1926 err
= btrfs_commit_transaction(trans
, root
);
1930 mutex_unlock(&root
->fs_info
->fs_mutex
);
1931 btrfs_btree_balance_dirty(root
, nr
);
1935 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
1937 struct btrfs_trans_handle
*trans
;
1938 struct btrfs_key key
;
1939 struct btrfs_root_item new_root_item
;
1940 struct extent_buffer
*tmp
;
1946 if (!root
->ref_cows
)
1949 down_write(&root
->snap_sem
);
1950 freeze_bdev(root
->fs_info
->sb
->s_bdev
);
1951 thaw_bdev(root
->fs_info
->sb
->s_bdev
, root
->fs_info
->sb
);
1953 mutex_lock(&root
->fs_info
->fs_mutex
);
1954 trans
= btrfs_start_transaction(root
, 1);
1957 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
1961 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1966 memcpy(&new_root_item
, &root
->root_item
,
1967 sizeof(new_root_item
));
1969 key
.objectid
= objectid
;
1971 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1973 btrfs_cow_block(trans
, root
, root
->node
, NULL
, 0, &tmp
);
1974 btrfs_set_root_blocknr(&new_root_item
,
1975 extent_buffer_blocknr(root
->node
));
1977 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1983 * insert the directory item
1985 key
.offset
= (u64
)-1;
1986 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1988 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
1989 &key
, BTRFS_FT_DIR
);
1994 ret
= btrfs_inc_root_ref(trans
, root
);
1998 nr
= trans
->blocks_used
;
1999 err
= btrfs_commit_transaction(trans
, root
);
2004 mutex_unlock(&root
->fs_info
->fs_mutex
);
2005 up_write(&root
->snap_sem
);
2006 btrfs_btree_balance_dirty(root
, nr
);
2010 static unsigned long force_ra(struct address_space
*mapping
,
2011 struct file_ra_state
*ra
, struct file
*file
,
2012 pgoff_t offset
, pgoff_t last_index
)
2016 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2017 req_size
= last_index
- offset
+ 1;
2018 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2021 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2022 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2023 return offset
+ req_size
;
2027 int btrfs_defrag_file(struct file
*file
) {
2028 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2029 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
2031 unsigned long last_index
;
2032 unsigned long ra_index
= 0;
2037 mutex_lock(&inode
->i_mutex
);
2038 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2039 for (i
= 0; i
<= last_index
; i
++) {
2040 if (i
== ra_index
) {
2041 ra_index
= force_ra(inode
->i_mapping
, &file
->f_ra
,
2042 file
, ra_index
, last_index
);
2044 page
= grab_cache_page(inode
->i_mapping
, i
);
2047 if (!PageUptodate(page
)) {
2048 btrfs_readpage(NULL
, page
);
2050 if (!PageUptodate(page
)) {
2052 page_cache_release(page
);
2056 page_start
= page
->index
<< PAGE_CACHE_SHIFT
;
2057 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2059 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2060 set_extent_delalloc(em_tree
, page_start
,
2061 page_end
, GFP_NOFS
);
2062 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2063 set_page_dirty(page
);
2065 page_cache_release(page
);
2066 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2070 mutex_unlock(&inode
->i_mutex
);
2074 static int btrfs_ioctl_snap_create(struct btrfs_root
*root
, void __user
*arg
)
2076 struct btrfs_ioctl_vol_args vol_args
;
2077 struct btrfs_dir_item
*di
;
2078 struct btrfs_path
*path
;
2082 if (copy_from_user(&vol_args
, arg
, sizeof(vol_args
)))
2085 namelen
= strlen(vol_args
.name
);
2086 if (namelen
> BTRFS_VOL_NAME_MAX
)
2088 if (strchr(vol_args
.name
, '/'))
2091 path
= btrfs_alloc_path();
2095 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2096 mutex_lock(&root
->fs_info
->fs_mutex
);
2097 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2099 vol_args
.name
, namelen
, 0);
2100 mutex_unlock(&root
->fs_info
->fs_mutex
);
2101 btrfs_free_path(path
);
2102 if (di
&& !IS_ERR(di
))
2107 if (root
== root
->fs_info
->tree_root
)
2108 return create_subvol(root
, vol_args
.name
, namelen
);
2109 return create_snapshot(root
, vol_args
.name
, namelen
);
2112 static int btrfs_ioctl_defrag(struct file
*file
)
2114 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2115 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2117 switch (inode
->i_mode
& S_IFMT
) {
2119 mutex_lock(&root
->fs_info
->fs_mutex
);
2120 btrfs_defrag_root(root
, 0);
2121 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2122 mutex_unlock(&root
->fs_info
->fs_mutex
);
2125 btrfs_defrag_file(file
);
2132 long btrfs_ioctl(struct file
*file
, unsigned int
2133 cmd
, unsigned long arg
)
2135 struct btrfs_root
*root
= BTRFS_I(file
->f_path
.dentry
->d_inode
)->root
;
2138 case BTRFS_IOC_SNAP_CREATE
:
2139 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2140 case BTRFS_IOC_DEFRAG
:
2141 return btrfs_ioctl_defrag(file
);
2148 * Called inside transaction, so use GFP_NOFS
2150 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2152 struct btrfs_inode
*ei
;
2154 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2158 return &ei
->vfs_inode
;
2161 void btrfs_destroy_inode(struct inode
*inode
)
2163 WARN_ON(!list_empty(&inode
->i_dentry
));
2164 WARN_ON(inode
->i_data
.nrpages
);
2166 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2169 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2170 unsigned long flags
)
2172 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2174 inode_init_once(&ei
->vfs_inode
);
2177 void btrfs_destroy_cachep(void)
2179 if (btrfs_inode_cachep
)
2180 kmem_cache_destroy(btrfs_inode_cachep
);
2181 if (btrfs_trans_handle_cachep
)
2182 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2183 if (btrfs_transaction_cachep
)
2184 kmem_cache_destroy(btrfs_transaction_cachep
);
2185 if (btrfs_bit_radix_cachep
)
2186 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2187 if (btrfs_path_cachep
)
2188 kmem_cache_destroy(btrfs_path_cachep
);
2191 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2192 unsigned long extra_flags
,
2193 void (*ctor
)(void *, struct kmem_cache
*,
2196 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2197 SLAB_MEM_SPREAD
| extra_flags
), ctor
2198 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2204 int btrfs_init_cachep(void)
2206 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2207 sizeof(struct btrfs_inode
),
2209 if (!btrfs_inode_cachep
)
2211 btrfs_trans_handle_cachep
=
2212 btrfs_cache_create("btrfs_trans_handle_cache",
2213 sizeof(struct btrfs_trans_handle
),
2215 if (!btrfs_trans_handle_cachep
)
2217 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2218 sizeof(struct btrfs_transaction
),
2220 if (!btrfs_transaction_cachep
)
2222 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2223 sizeof(struct btrfs_path
),
2225 if (!btrfs_path_cachep
)
2227 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2228 SLAB_DESTROY_BY_RCU
, NULL
);
2229 if (!btrfs_bit_radix_cachep
)
2233 btrfs_destroy_cachep();
2237 static int btrfs_getattr(struct vfsmount
*mnt
,
2238 struct dentry
*dentry
, struct kstat
*stat
)
2240 struct inode
*inode
= dentry
->d_inode
;
2241 generic_fillattr(inode
, stat
);
2242 stat
->blksize
= 256 * 1024;
2246 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2247 struct inode
* new_dir
,struct dentry
*new_dentry
)
2249 struct btrfs_trans_handle
*trans
;
2250 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2251 struct inode
*new_inode
= new_dentry
->d_inode
;
2252 struct inode
*old_inode
= old_dentry
->d_inode
;
2253 struct timespec ctime
= CURRENT_TIME
;
2254 struct btrfs_path
*path
;
2255 struct btrfs_dir_item
*di
;
2258 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2259 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2263 mutex_lock(&root
->fs_info
->fs_mutex
);
2264 trans
= btrfs_start_transaction(root
, 1);
2266 btrfs_set_trans_block_group(trans
, new_dir
);
2267 path
= btrfs_alloc_path();
2273 old_dentry
->d_inode
->i_nlink
++;
2274 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2275 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2276 old_inode
->i_ctime
= ctime
;
2278 if (S_ISDIR(old_inode
->i_mode
) && old_dir
!= new_dir
) {
2279 struct btrfs_key
*location
= &BTRFS_I(new_dir
)->location
;
2280 struct btrfs_key old_parent_key
;
2281 di
= btrfs_lookup_dir_item(trans
, root
, path
, old_inode
->i_ino
,
2291 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &old_parent_key
);
2292 ret
= btrfs_del_item(trans
, root
, path
);
2296 btrfs_release_path(root
, path
);
2298 di
= btrfs_lookup_dir_index_item(trans
, root
, path
,
2300 old_parent_key
.objectid
,
2310 ret
= btrfs_del_item(trans
, root
, path
);
2314 btrfs_release_path(root
, path
);
2316 ret
= btrfs_insert_dir_item(trans
, root
, "..", 2,
2317 old_inode
->i_ino
, location
,
2324 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2329 new_inode
->i_ctime
= CURRENT_TIME
;
2330 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2334 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2339 btrfs_free_path(path
);
2340 btrfs_end_transaction(trans
, root
);
2341 mutex_unlock(&root
->fs_info
->fs_mutex
);
2345 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2346 const char *symname
)
2348 struct btrfs_trans_handle
*trans
;
2349 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2350 struct btrfs_path
*path
;
2351 struct btrfs_key key
;
2352 struct inode
*inode
;
2359 struct btrfs_file_extent_item
*ei
;
2360 struct extent_buffer
*leaf
;
2363 name_len
= strlen(symname
) + 1;
2364 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2365 return -ENAMETOOLONG
;
2366 mutex_lock(&root
->fs_info
->fs_mutex
);
2367 trans
= btrfs_start_transaction(root
, 1);
2368 btrfs_set_trans_block_group(trans
, dir
);
2370 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2376 inode
= btrfs_new_inode(trans
, root
, objectid
,
2377 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2378 err
= PTR_ERR(inode
);
2382 btrfs_set_trans_block_group(trans
, inode
);
2383 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2387 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2388 inode
->i_fop
= &btrfs_file_operations
;
2389 inode
->i_op
= &btrfs_file_inode_operations
;
2390 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
2391 inode
->i_mapping
, GFP_NOFS
);
2392 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
2394 dir
->i_sb
->s_dirt
= 1;
2395 btrfs_update_inode_block_group(trans
, inode
);
2396 btrfs_update_inode_block_group(trans
, dir
);
2400 path
= btrfs_alloc_path();
2402 key
.objectid
= inode
->i_ino
;
2404 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2405 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2406 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2412 leaf
= path
->nodes
[0];
2413 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2414 struct btrfs_file_extent_item
);
2415 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2416 btrfs_set_file_extent_type(leaf
, ei
,
2417 BTRFS_FILE_EXTENT_INLINE
);
2418 ptr
= btrfs_file_extent_inline_start(ei
);
2419 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
2420 btrfs_mark_buffer_dirty(leaf
);
2421 btrfs_free_path(path
);
2423 inode
->i_op
= &btrfs_symlink_inode_operations
;
2424 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2425 inode
->i_size
= name_len
- 1;
2426 err
= btrfs_update_inode(trans
, root
, inode
);
2431 nr
= trans
->blocks_used
;
2432 btrfs_end_transaction(trans
, root
);
2433 mutex_unlock(&root
->fs_info
->fs_mutex
);
2435 inode_dec_link_count(inode
);
2438 btrfs_btree_balance_dirty(root
, nr
);
2442 static struct inode_operations btrfs_dir_inode_operations
= {
2443 .lookup
= btrfs_lookup
,
2444 .create
= btrfs_create
,
2445 .unlink
= btrfs_unlink
,
2447 .mkdir
= btrfs_mkdir
,
2448 .rmdir
= btrfs_rmdir
,
2449 .rename
= btrfs_rename
,
2450 .symlink
= btrfs_symlink
,
2451 .setattr
= btrfs_setattr
,
2452 .mknod
= btrfs_mknod
,
2455 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2456 .lookup
= btrfs_lookup
,
2459 static struct file_operations btrfs_dir_file_operations
= {
2460 .llseek
= generic_file_llseek
,
2461 .read
= generic_read_dir
,
2462 .readdir
= btrfs_readdir
,
2463 .unlocked_ioctl
= btrfs_ioctl
,
2464 #ifdef CONFIG_COMPAT
2465 .compat_ioctl
= btrfs_ioctl
,
2469 static struct extent_map_ops btrfs_extent_map_ops
= {
2470 .fill_delalloc
= run_delalloc_range
,
2471 .writepage_io_hook
= btrfs_writepage_io_hook
,
2472 .readpage_io_hook
= btrfs_readpage_io_hook
,
2473 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2476 static struct address_space_operations btrfs_aops
= {
2477 .readpage
= btrfs_readpage
,
2478 .writepage
= btrfs_writepage
,
2479 .sync_page
= block_sync_page
,
2480 .prepare_write
= btrfs_prepare_write
,
2481 .commit_write
= btrfs_commit_write
,
2483 .invalidatepage
= btrfs_invalidatepage
,
2484 .releasepage
= btrfs_releasepage
,
2485 .set_page_dirty
= __set_page_dirty_nobuffers
,
2488 static struct address_space_operations btrfs_symlink_aops
= {
2489 .readpage
= btrfs_readpage
,
2490 .writepage
= btrfs_writepage
,
2491 .invalidatepage
= btrfs_invalidatepage
,
2492 .releasepage
= btrfs_releasepage
,
2495 static struct inode_operations btrfs_file_inode_operations
= {
2496 .truncate
= btrfs_truncate
,
2497 .getattr
= btrfs_getattr
,
2498 .setattr
= btrfs_setattr
,
2501 static struct inode_operations btrfs_special_inode_operations
= {
2502 .getattr
= btrfs_getattr
,
2503 .setattr
= btrfs_setattr
,
2506 static struct inode_operations btrfs_symlink_inode_operations
= {
2507 .readlink
= generic_readlink
,
2508 .follow_link
= page_follow_link_light
,
2509 .put_link
= page_put_link
,