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
= (u64
)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
, 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 read_extent_buffer(path
->nodes
[0], &csum
, (unsigned long)item
,
153 set_state_private(em_tree
, start
, csum
);
156 btrfs_free_path(path
);
157 mutex_unlock(&root
->fs_info
->fs_mutex
);
161 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
)
163 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
164 struct inode
*inode
= page
->mapping
->host
;
165 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
169 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
173 ret
= get_state_private(em_tree
, start
, &private);
174 local_irq_save(flags
);
175 kaddr
= kmap_atomic(page
, KM_IRQ0
);
179 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
180 btrfs_csum_final(csum
, (char *)&csum
);
181 if (csum
!= private) {
184 kunmap_atomic(kaddr
, KM_IRQ0
);
185 local_irq_restore(flags
);
189 printk("btrfs csum failed ino %lu off %llu\n",
190 page
->mapping
->host
->i_ino
, (unsigned long long)start
);
191 memset(kaddr
+ offset
, 1, end
- start
+ 1);
192 flush_dcache_page(page
);
193 kunmap_atomic(kaddr
, KM_IRQ0
);
194 local_irq_restore(flags
);
198 void btrfs_read_locked_inode(struct inode
*inode
)
200 struct btrfs_path
*path
;
201 struct extent_buffer
*leaf
;
202 struct btrfs_inode_item
*inode_item
;
203 struct btrfs_inode_timespec
*tspec
;
204 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
205 struct btrfs_key location
;
206 u64 alloc_group_block
;
210 path
= btrfs_alloc_path();
212 mutex_lock(&root
->fs_info
->fs_mutex
);
214 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
215 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
219 leaf
= path
->nodes
[0];
220 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
221 struct btrfs_inode_item
);
223 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
224 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
225 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
226 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
227 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
229 tspec
= btrfs_inode_atime(inode_item
);
230 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
231 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
233 tspec
= btrfs_inode_mtime(inode_item
);
234 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
235 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
237 tspec
= btrfs_inode_ctime(inode_item
);
238 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
239 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
241 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
242 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
244 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
246 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
247 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
250 btrfs_free_path(path
);
253 mutex_unlock(&root
->fs_info
->fs_mutex
);
255 switch (inode
->i_mode
& S_IFMT
) {
257 inode
->i_mapping
->a_ops
= &btrfs_aops
;
258 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
259 inode
->i_fop
= &btrfs_file_operations
;
260 inode
->i_op
= &btrfs_file_inode_operations
;
263 inode
->i_fop
= &btrfs_dir_file_operations
;
264 if (root
== root
->fs_info
->tree_root
)
265 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
267 inode
->i_op
= &btrfs_dir_inode_operations
;
270 inode
->i_op
= &btrfs_symlink_inode_operations
;
271 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
274 init_special_inode(inode
, inode
->i_mode
, rdev
);
280 btrfs_release_path(root
, path
);
281 btrfs_free_path(path
);
282 mutex_unlock(&root
->fs_info
->fs_mutex
);
283 make_bad_inode(inode
);
286 static void fill_inode_item(struct extent_buffer
*leaf
,
287 struct btrfs_inode_item
*item
,
290 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
291 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
292 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
293 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
294 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
296 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
297 inode
->i_atime
.tv_sec
);
298 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
299 inode
->i_atime
.tv_nsec
);
301 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
302 inode
->i_mtime
.tv_sec
);
303 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
304 inode
->i_mtime
.tv_nsec
);
306 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
307 inode
->i_ctime
.tv_sec
);
308 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
309 inode
->i_ctime
.tv_nsec
);
311 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
312 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
313 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
314 btrfs_set_inode_block_group(leaf
, item
,
315 BTRFS_I(inode
)->block_group
->key
.objectid
);
318 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
319 struct btrfs_root
*root
,
322 struct btrfs_inode_item
*inode_item
;
323 struct btrfs_path
*path
;
324 struct extent_buffer
*leaf
;
327 path
= btrfs_alloc_path();
329 ret
= btrfs_lookup_inode(trans
, root
, path
,
330 &BTRFS_I(inode
)->location
, 1);
337 leaf
= path
->nodes
[0];
338 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
339 struct btrfs_inode_item
);
341 fill_inode_item(leaf
, inode_item
, inode
);
342 btrfs_mark_buffer_dirty(leaf
);
343 btrfs_set_inode_last_trans(trans
, inode
);
346 btrfs_release_path(root
, path
);
347 btrfs_free_path(path
);
352 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
353 struct btrfs_root
*root
,
355 struct dentry
*dentry
)
357 struct btrfs_path
*path
;
358 const char *name
= dentry
->d_name
.name
;
359 int name_len
= dentry
->d_name
.len
;
361 struct extent_buffer
*leaf
;
362 struct btrfs_dir_item
*di
;
363 struct btrfs_key key
;
365 path
= btrfs_alloc_path();
371 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
381 leaf
= path
->nodes
[0];
382 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
383 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
386 btrfs_release_path(root
, path
);
388 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
389 key
.objectid
, name
, name_len
, -1);
398 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
400 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
402 btrfs_free_path(path
);
404 dir
->i_size
-= name_len
* 2;
405 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
406 btrfs_update_inode(trans
, root
, dir
);
407 drop_nlink(dentry
->d_inode
);
408 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
409 dir
->i_sb
->s_dirt
= 1;
414 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
416 struct btrfs_root
*root
;
417 struct btrfs_trans_handle
*trans
;
421 root
= BTRFS_I(dir
)->root
;
422 mutex_lock(&root
->fs_info
->fs_mutex
);
423 trans
= btrfs_start_transaction(root
, 1);
425 btrfs_set_trans_block_group(trans
, dir
);
426 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
427 nr
= trans
->blocks_used
;
429 btrfs_end_transaction(trans
, root
);
430 mutex_unlock(&root
->fs_info
->fs_mutex
);
431 btrfs_btree_balance_dirty(root
, nr
);
436 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
438 struct inode
*inode
= dentry
->d_inode
;
441 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
442 struct btrfs_path
*path
;
443 struct btrfs_key key
;
444 struct btrfs_trans_handle
*trans
;
445 struct btrfs_key found_key
;
447 struct extent_buffer
*leaf
;
448 char *goodnames
= "..";
451 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
454 path
= btrfs_alloc_path();
456 mutex_lock(&root
->fs_info
->fs_mutex
);
457 trans
= btrfs_start_transaction(root
, 1);
459 btrfs_set_trans_block_group(trans
, dir
);
460 key
.objectid
= inode
->i_ino
;
461 key
.offset
= (u64
)-1;
464 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
470 if (path
->slots
[0] == 0) {
475 leaf
= path
->nodes
[0];
476 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
477 found_type
= btrfs_key_type(&found_key
);
478 if (found_key
.objectid
!= inode
->i_ino
) {
482 if ((found_type
!= BTRFS_DIR_ITEM_KEY
&&
483 found_type
!= BTRFS_DIR_INDEX_KEY
) ||
484 (!btrfs_match_dir_item_name(root
, path
, goodnames
, 2) &&
485 !btrfs_match_dir_item_name(root
, path
, goodnames
, 1))) {
489 ret
= btrfs_del_item(trans
, root
, path
);
492 if (found_type
== BTRFS_DIR_ITEM_KEY
&& found_key
.offset
== 1)
494 btrfs_release_path(root
, path
);
497 btrfs_release_path(root
, path
);
499 /* now the directory is empty */
500 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
505 btrfs_release_path(root
, path
);
506 btrfs_free_path(path
);
507 nr
= trans
->blocks_used
;
508 ret
= btrfs_end_transaction(trans
, root
);
509 mutex_unlock(&root
->fs_info
->fs_mutex
);
510 btrfs_btree_balance_dirty(root
, nr
);
516 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
517 struct btrfs_root
*root
,
520 struct btrfs_path
*path
;
525 path
= btrfs_alloc_path();
527 ret
= btrfs_lookup_inode(trans
, root
, path
,
528 &BTRFS_I(inode
)->location
, -1);
532 ret
= btrfs_del_item(trans
, root
, path
);
533 btrfs_free_path(path
);
538 * this can truncate away extent items, csum items and directory items.
539 * It starts at a high offset and removes keys until it can't find
540 * any higher than i_size.
542 * csum items that cross the new i_size are truncated to the new size
545 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
546 struct btrfs_root
*root
,
550 struct btrfs_path
*path
;
551 struct btrfs_key key
;
552 struct btrfs_key found_key
;
554 struct extent_buffer
*leaf
;
555 struct btrfs_file_extent_item
*fi
;
556 u64 extent_start
= 0;
557 u64 extent_num_bytes
= 0;
562 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
563 path
= btrfs_alloc_path();
567 /* FIXME, add redo link to tree so we don't leak on crash */
568 key
.objectid
= inode
->i_ino
;
569 key
.offset
= (u64
)-1;
573 btrfs_init_path(path
);
575 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
580 BUG_ON(path
->slots
[0] == 0);
583 leaf
= path
->nodes
[0];
584 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
585 found_type
= btrfs_key_type(&found_key
);
587 if (found_key
.objectid
!= inode
->i_ino
)
590 if (found_type
!= BTRFS_CSUM_ITEM_KEY
&&
591 found_type
!= BTRFS_DIR_ITEM_KEY
&&
592 found_type
!= BTRFS_DIR_INDEX_KEY
&&
593 found_type
!= BTRFS_EXTENT_DATA_KEY
)
596 item_end
= found_key
.offset
;
597 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
598 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
599 struct btrfs_file_extent_item
);
600 if (btrfs_file_extent_type(leaf
, fi
) !=
601 BTRFS_FILE_EXTENT_INLINE
) {
603 btrfs_file_extent_num_bytes(leaf
, fi
);
606 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
607 ret
= btrfs_csum_truncate(trans
, root
, path
,
611 if (item_end
< inode
->i_size
) {
612 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
613 found_type
= BTRFS_INODE_ITEM_KEY
;
614 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
615 found_type
= BTRFS_CSUM_ITEM_KEY
;
616 } else if (found_type
) {
621 btrfs_set_key_type(&key
, found_type
);
622 btrfs_release_path(root
, path
);
625 if (found_key
.offset
>= inode
->i_size
)
631 /* FIXME, shrink the extent if the ref count is only 1 */
632 if (found_type
== BTRFS_EXTENT_DATA_KEY
&&
633 btrfs_file_extent_type(leaf
, fi
) !=
634 BTRFS_FILE_EXTENT_INLINE
) {
636 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
639 btrfs_file_extent_num_bytes(leaf
, fi
);
640 extent_num_bytes
= inode
->i_size
-
641 found_key
.offset
+ root
->sectorsize
- 1;
642 btrfs_set_file_extent_num_bytes(leaf
, fi
,
644 num_dec
= (orig_num_bytes
-
645 extent_num_bytes
) >> 9;
646 if (extent_start
!= 0) {
647 inode
->i_blocks
-= num_dec
;
649 btrfs_mark_buffer_dirty(leaf
);
652 btrfs_file_extent_disk_num_bytes(leaf
,
654 /* FIXME blocksize != 4096 */
655 num_dec
= btrfs_file_extent_num_bytes(leaf
,
657 if (extent_start
!= 0) {
659 inode
->i_blocks
-= num_dec
;
664 ret
= btrfs_del_item(trans
, root
, path
);
670 btrfs_release_path(root
, path
);
672 ret
= btrfs_free_extent(trans
, root
, extent_start
,
673 extent_num_bytes
, 0);
679 btrfs_release_path(root
, path
);
680 btrfs_free_path(path
);
681 inode
->i_sb
->s_dirt
= 1;
685 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
690 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
691 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
692 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
694 set_page_extent_mapped(page
);
696 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
697 set_extent_delalloc(&BTRFS_I(inode
)->extent_tree
, page_start
,
699 if (zero_start
!= PAGE_CACHE_SIZE
) {
701 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
702 flush_dcache_page(page
);
705 set_page_dirty(page
);
706 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
712 * taken from block_truncate_page, but does cow as it zeros out
713 * any bytes left in the last page in the file.
715 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
717 struct inode
*inode
= mapping
->host
;
718 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
719 u32 blocksize
= root
->sectorsize
;
720 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
721 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
726 if ((offset
& (blocksize
- 1)) == 0)
729 down_read(&root
->snap_sem
);
731 page
= grab_cache_page(mapping
, index
);
734 if (!PageUptodate(page
)) {
735 ret
= btrfs_readpage(NULL
, page
);
737 if (!PageUptodate(page
)) {
742 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
744 ret
= btrfs_cow_one_page(inode
, page
, offset
);
747 page_cache_release(page
);
748 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
753 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
755 struct inode
*inode
= dentry
->d_inode
;
758 err
= inode_change_ok(inode
, attr
);
762 if (S_ISREG(inode
->i_mode
) &&
763 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
764 struct btrfs_trans_handle
*trans
;
765 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
766 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
768 u64 mask
= root
->sectorsize
- 1;
769 u64 pos
= (inode
->i_size
+ mask
) & ~mask
;
770 u64 block_end
= attr
->ia_size
| mask
;
774 if (attr
->ia_size
<= pos
)
777 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
779 lock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
780 hole_size
= (attr
->ia_size
- pos
+ mask
) & ~mask
;
782 mutex_lock(&root
->fs_info
->fs_mutex
);
783 trans
= btrfs_start_transaction(root
, 1);
784 btrfs_set_trans_block_group(trans
, inode
);
785 err
= btrfs_drop_extents(trans
, root
, inode
,
786 pos
, pos
+ hole_size
, pos
,
789 err
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
790 pos
, 0, 0, hole_size
);
791 btrfs_end_transaction(trans
, root
);
792 mutex_unlock(&root
->fs_info
->fs_mutex
);
793 unlock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
798 err
= inode_setattr(inode
, attr
);
802 void btrfs_delete_inode(struct inode
*inode
)
804 struct btrfs_trans_handle
*trans
;
805 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
809 truncate_inode_pages(&inode
->i_data
, 0);
810 if (is_bad_inode(inode
)) {
815 mutex_lock(&root
->fs_info
->fs_mutex
);
816 trans
= btrfs_start_transaction(root
, 1);
818 btrfs_set_trans_block_group(trans
, inode
);
819 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
822 ret
= btrfs_free_inode(trans
, root
, inode
);
825 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
);
833 nr
= trans
->blocks_used
;
834 btrfs_end_transaction(trans
, root
);
835 mutex_unlock(&root
->fs_info
->fs_mutex
);
836 btrfs_btree_balance_dirty(root
, nr
);
842 * this returns the key found in the dir entry in the location pointer.
843 * If no dir entries were found, location->objectid is 0.
845 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
846 struct btrfs_key
*location
)
848 const char *name
= dentry
->d_name
.name
;
849 int namelen
= dentry
->d_name
.len
;
850 struct btrfs_dir_item
*di
;
851 struct btrfs_path
*path
;
852 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
855 path
= btrfs_alloc_path();
857 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
861 if (!di
|| IS_ERR(di
)) {
862 location
->objectid
= 0;
865 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
867 btrfs_release_path(root
, path
);
868 btrfs_free_path(path
);
873 * when we hit a tree root in a directory, the btrfs part of the inode
874 * needs to be changed to reflect the root directory of the tree root. This
875 * is kind of like crossing a mount point.
877 static int fixup_tree_root_location(struct btrfs_root
*root
,
878 struct btrfs_key
*location
,
879 struct btrfs_root
**sub_root
,
880 struct dentry
*dentry
)
882 struct btrfs_path
*path
;
883 struct btrfs_root_item
*ri
;
885 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
887 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
890 path
= btrfs_alloc_path();
892 mutex_lock(&root
->fs_info
->fs_mutex
);
894 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
897 if (IS_ERR(*sub_root
))
898 return PTR_ERR(*sub_root
);
900 ri
= &(*sub_root
)->root_item
;
901 location
->objectid
= btrfs_root_dirid(ri
);
902 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
903 location
->offset
= 0;
905 btrfs_free_path(path
);
906 mutex_unlock(&root
->fs_info
->fs_mutex
);
910 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
912 struct btrfs_iget_args
*args
= p
;
913 inode
->i_ino
= args
->ino
;
914 BTRFS_I(inode
)->root
= args
->root
;
915 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
916 inode
->i_mapping
, GFP_NOFS
);
920 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
922 struct btrfs_iget_args
*args
= opaque
;
923 return (args
->ino
== inode
->i_ino
&&
924 args
->root
== BTRFS_I(inode
)->root
);
927 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
928 struct btrfs_root
*root
)
931 struct btrfs_iget_args args
;
935 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
936 btrfs_init_locked_inode
,
941 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
942 struct nameidata
*nd
)
944 struct inode
* inode
;
945 struct btrfs_inode
*bi
= BTRFS_I(dir
);
946 struct btrfs_root
*root
= bi
->root
;
947 struct btrfs_root
*sub_root
= root
;
948 struct btrfs_key location
;
951 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
952 return ERR_PTR(-ENAMETOOLONG
);
954 mutex_lock(&root
->fs_info
->fs_mutex
);
955 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
956 mutex_unlock(&root
->fs_info
->fs_mutex
);
962 if (location
.objectid
) {
963 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
968 return ERR_PTR(-ENOENT
);
969 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
972 return ERR_PTR(-EACCES
);
973 if (inode
->i_state
& I_NEW
) {
974 /* the inode and parent dir are two different roots */
975 if (sub_root
!= root
) {
977 sub_root
->inode
= inode
;
979 BTRFS_I(inode
)->root
= sub_root
;
980 memcpy(&BTRFS_I(inode
)->location
, &location
,
982 btrfs_read_locked_inode(inode
);
983 unlock_new_inode(inode
);
986 return d_splice_alias(inode
, dentry
);
989 static unsigned char btrfs_filetype_table
[] = {
990 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
993 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
995 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
996 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
997 struct btrfs_item
*item
;
998 struct btrfs_dir_item
*di
;
999 struct btrfs_key key
;
1000 struct btrfs_key found_key
;
1001 struct btrfs_path
*path
;
1004 struct extent_buffer
*leaf
;
1007 unsigned char d_type
;
1012 int key_type
= BTRFS_DIR_INDEX_KEY
;
1017 /* FIXME, use a real flag for deciding about the key type */
1018 if (root
->fs_info
->tree_root
== root
)
1019 key_type
= BTRFS_DIR_ITEM_KEY
;
1021 mutex_lock(&root
->fs_info
->fs_mutex
);
1022 key
.objectid
= inode
->i_ino
;
1023 btrfs_set_key_type(&key
, key_type
);
1024 key
.offset
= filp
->f_pos
;
1026 path
= btrfs_alloc_path();
1028 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1033 leaf
= path
->nodes
[0];
1034 nritems
= btrfs_header_nritems(leaf
);
1035 slot
= path
->slots
[0];
1036 if (advance
|| slot
>= nritems
) {
1037 if (slot
>= nritems
-1) {
1038 ret
= btrfs_next_leaf(root
, path
);
1041 leaf
= path
->nodes
[0];
1042 nritems
= btrfs_header_nritems(leaf
);
1043 slot
= path
->slots
[0];
1050 item
= btrfs_item_nr(leaf
, slot
);
1051 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1053 if (found_key
.objectid
!= key
.objectid
)
1055 if (btrfs_key_type(&found_key
) != key_type
)
1057 if (found_key
.offset
< filp
->f_pos
)
1060 filp
->f_pos
= found_key
.offset
;
1062 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1064 di_total
= btrfs_item_size(leaf
, item
);
1065 while(di_cur
< di_total
) {
1066 struct btrfs_key location
;
1068 name_len
= btrfs_dir_name_len(leaf
, di
);
1069 if (name_len
< 32) {
1070 name_ptr
= tmp_name
;
1072 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1075 read_extent_buffer(leaf
, name_ptr
,
1076 (unsigned long)(di
+ 1), name_len
);
1078 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1079 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1081 over
= filldir(dirent
, name_ptr
, name_len
,
1086 if (name_ptr
!= tmp_name
)
1091 di_len
= btrfs_dir_name_len(leaf
, di
) + sizeof(*di
);
1093 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1100 btrfs_release_path(root
, path
);
1101 btrfs_free_path(path
);
1102 mutex_unlock(&root
->fs_info
->fs_mutex
);
1106 int btrfs_write_inode(struct inode
*inode
, int wait
)
1108 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1109 struct btrfs_trans_handle
*trans
;
1113 mutex_lock(&root
->fs_info
->fs_mutex
);
1114 trans
= btrfs_start_transaction(root
, 1);
1115 btrfs_set_trans_block_group(trans
, inode
);
1116 ret
= btrfs_commit_transaction(trans
, root
);
1117 mutex_unlock(&root
->fs_info
->fs_mutex
);
1123 * This is somewhat expensive, updating the tree every time the
1124 * inode changes. But, it is most likely to find the inode in cache.
1125 * FIXME, needs more benchmarking...there are no reasons other than performance
1126 * to keep or drop this code.
1128 void btrfs_dirty_inode(struct inode
*inode
)
1130 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1131 struct btrfs_trans_handle
*trans
;
1133 mutex_lock(&root
->fs_info
->fs_mutex
);
1134 trans
= btrfs_start_transaction(root
, 1);
1135 btrfs_set_trans_block_group(trans
, inode
);
1136 btrfs_update_inode(trans
, root
, inode
);
1137 btrfs_end_transaction(trans
, root
);
1138 mutex_unlock(&root
->fs_info
->fs_mutex
);
1141 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1142 struct btrfs_root
*root
,
1144 struct btrfs_block_group_cache
*group
,
1147 struct inode
*inode
;
1148 struct btrfs_inode_item
*inode_item
;
1149 struct btrfs_key
*location
;
1150 struct btrfs_path
*path
;
1154 path
= btrfs_alloc_path();
1157 inode
= new_inode(root
->fs_info
->sb
);
1159 return ERR_PTR(-ENOMEM
);
1161 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1162 inode
->i_mapping
, GFP_NOFS
);
1163 BTRFS_I(inode
)->root
= root
;
1169 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1170 BTRFS_I(inode
)->block_group
= group
;
1172 ret
= btrfs_insert_empty_inode(trans
, root
, path
, objectid
);
1176 inode
->i_uid
= current
->fsuid
;
1177 inode
->i_gid
= current
->fsgid
;
1178 inode
->i_mode
= mode
;
1179 inode
->i_ino
= objectid
;
1180 inode
->i_blocks
= 0;
1181 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1182 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1183 struct btrfs_inode_item
);
1184 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1185 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1186 btrfs_free_path(path
);
1188 location
= &BTRFS_I(inode
)->location
;
1189 location
->objectid
= objectid
;
1190 location
->offset
= 0;
1191 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1193 insert_inode_hash(inode
);
1196 btrfs_free_path(path
);
1197 return ERR_PTR(ret
);
1200 static inline u8
btrfs_inode_type(struct inode
*inode
)
1202 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1205 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1206 struct dentry
*dentry
, struct inode
*inode
)
1209 struct btrfs_key key
;
1210 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1211 struct inode
*parent_inode
;
1213 key
.objectid
= inode
->i_ino
;
1214 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1217 ret
= btrfs_insert_dir_item(trans
, root
,
1218 dentry
->d_name
.name
, dentry
->d_name
.len
,
1219 dentry
->d_parent
->d_inode
->i_ino
,
1220 &key
, btrfs_inode_type(inode
));
1222 parent_inode
= dentry
->d_parent
->d_inode
;
1223 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1224 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1225 ret
= btrfs_update_inode(trans
, root
,
1226 dentry
->d_parent
->d_inode
);
1231 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1232 struct dentry
*dentry
, struct inode
*inode
)
1234 int err
= btrfs_add_link(trans
, dentry
, inode
);
1236 d_instantiate(dentry
, inode
);
1244 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1245 int mode
, dev_t rdev
)
1247 struct btrfs_trans_handle
*trans
;
1248 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1249 struct inode
*inode
;
1255 if (!new_valid_dev(rdev
))
1258 mutex_lock(&root
->fs_info
->fs_mutex
);
1259 trans
= btrfs_start_transaction(root
, 1);
1260 btrfs_set_trans_block_group(trans
, dir
);
1262 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1268 inode
= btrfs_new_inode(trans
, root
, objectid
,
1269 BTRFS_I(dir
)->block_group
, mode
);
1270 err
= PTR_ERR(inode
);
1274 btrfs_set_trans_block_group(trans
, inode
);
1275 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1279 inode
->i_op
= &btrfs_special_inode_operations
;
1280 init_special_inode(inode
, inode
->i_mode
, rdev
);
1281 btrfs_update_inode(trans
, root
, inode
);
1283 dir
->i_sb
->s_dirt
= 1;
1284 btrfs_update_inode_block_group(trans
, inode
);
1285 btrfs_update_inode_block_group(trans
, dir
);
1287 nr
= trans
->blocks_used
;
1288 btrfs_end_transaction(trans
, root
);
1289 mutex_unlock(&root
->fs_info
->fs_mutex
);
1292 inode_dec_link_count(inode
);
1295 btrfs_btree_balance_dirty(root
, nr
);
1299 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1300 int mode
, struct nameidata
*nd
)
1302 struct btrfs_trans_handle
*trans
;
1303 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1304 struct inode
*inode
;
1310 mutex_lock(&root
->fs_info
->fs_mutex
);
1311 trans
= btrfs_start_transaction(root
, 1);
1312 btrfs_set_trans_block_group(trans
, dir
);
1314 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1320 inode
= btrfs_new_inode(trans
, root
, objectid
,
1321 BTRFS_I(dir
)->block_group
, mode
);
1322 err
= PTR_ERR(inode
);
1326 btrfs_set_trans_block_group(trans
, inode
);
1327 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1331 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1332 inode
->i_fop
= &btrfs_file_operations
;
1333 inode
->i_op
= &btrfs_file_inode_operations
;
1334 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1335 inode
->i_mapping
, GFP_NOFS
);
1336 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
1338 dir
->i_sb
->s_dirt
= 1;
1339 btrfs_update_inode_block_group(trans
, inode
);
1340 btrfs_update_inode_block_group(trans
, dir
);
1342 nr
= trans
->blocks_used
;
1343 btrfs_end_transaction(trans
, root
);
1344 mutex_unlock(&root
->fs_info
->fs_mutex
);
1347 inode_dec_link_count(inode
);
1350 btrfs_btree_balance_dirty(root
, nr
);
1354 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1355 struct dentry
*dentry
)
1357 struct btrfs_trans_handle
*trans
;
1358 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1359 struct inode
*inode
= old_dentry
->d_inode
;
1364 if (inode
->i_nlink
== 0)
1368 mutex_lock(&root
->fs_info
->fs_mutex
);
1369 trans
= btrfs_start_transaction(root
, 1);
1371 btrfs_set_trans_block_group(trans
, dir
);
1372 atomic_inc(&inode
->i_count
);
1373 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1378 dir
->i_sb
->s_dirt
= 1;
1379 btrfs_update_inode_block_group(trans
, dir
);
1380 err
= btrfs_update_inode(trans
, root
, inode
);
1385 nr
= trans
->blocks_used
;
1386 btrfs_end_transaction(trans
, root
);
1387 mutex_unlock(&root
->fs_info
->fs_mutex
);
1390 inode_dec_link_count(inode
);
1393 btrfs_btree_balance_dirty(root
, nr
);
1397 static int btrfs_make_empty_dir(struct btrfs_trans_handle
*trans
,
1398 struct btrfs_root
*root
,
1399 u64 objectid
, u64 dirid
)
1403 struct btrfs_key key
;
1408 key
.objectid
= objectid
;
1410 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1412 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 1, objectid
,
1413 &key
, BTRFS_FT_DIR
);
1417 key
.objectid
= dirid
;
1418 ret
= btrfs_insert_dir_item(trans
, root
, buf
, 2, objectid
,
1419 &key
, BTRFS_FT_DIR
);
1426 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1428 struct inode
*inode
;
1429 struct btrfs_trans_handle
*trans
;
1430 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1432 int drop_on_err
= 0;
1434 unsigned long nr
= 1;
1436 mutex_lock(&root
->fs_info
->fs_mutex
);
1437 trans
= btrfs_start_transaction(root
, 1);
1438 btrfs_set_trans_block_group(trans
, dir
);
1440 if (IS_ERR(trans
)) {
1441 err
= PTR_ERR(trans
);
1445 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1451 inode
= btrfs_new_inode(trans
, root
, objectid
,
1452 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1453 if (IS_ERR(inode
)) {
1454 err
= PTR_ERR(inode
);
1459 inode
->i_op
= &btrfs_dir_inode_operations
;
1460 inode
->i_fop
= &btrfs_dir_file_operations
;
1461 btrfs_set_trans_block_group(trans
, inode
);
1463 err
= btrfs_make_empty_dir(trans
, root
, inode
->i_ino
, dir
->i_ino
);
1468 err
= btrfs_update_inode(trans
, root
, inode
);
1472 err
= btrfs_add_link(trans
, dentry
, inode
);
1476 d_instantiate(dentry
, inode
);
1478 dir
->i_sb
->s_dirt
= 1;
1479 btrfs_update_inode_block_group(trans
, inode
);
1480 btrfs_update_inode_block_group(trans
, dir
);
1483 nr
= trans
->blocks_used
;
1484 btrfs_end_transaction(trans
, root
);
1487 mutex_unlock(&root
->fs_info
->fs_mutex
);
1490 btrfs_btree_balance_dirty(root
, nr
);
1494 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1495 size_t page_offset
, u64 start
, u64 end
,
1501 u64 extent_start
= 0;
1503 u64 objectid
= inode
->i_ino
;
1505 int failed_insert
= 0;
1506 struct btrfs_path
*path
;
1507 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1508 struct btrfs_file_extent_item
*item
;
1509 struct extent_buffer
*leaf
;
1510 struct btrfs_key found_key
;
1511 struct extent_map
*em
= NULL
;
1512 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1513 struct btrfs_trans_handle
*trans
= NULL
;
1515 path
= btrfs_alloc_path();
1517 mutex_lock(&root
->fs_info
->fs_mutex
);
1520 em
= lookup_extent_mapping(em_tree
, start
, end
);
1525 em
= alloc_extent_map(GFP_NOFS
);
1530 em
->start
= EXTENT_MAP_HOLE
;
1531 em
->end
= EXTENT_MAP_HOLE
;
1533 em
->bdev
= inode
->i_sb
->s_bdev
;
1534 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
1535 objectid
, start
, 0);
1542 if (path
->slots
[0] == 0)
1547 leaf
= path
->nodes
[0];
1548 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1549 struct btrfs_file_extent_item
);
1550 /* are we inside the extent that was found? */
1551 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1552 found_type
= btrfs_key_type(&found_key
);
1553 if (found_key
.objectid
!= objectid
||
1554 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1558 found_type
= btrfs_file_extent_type(leaf
, item
);
1559 extent_start
= found_key
.offset
;
1560 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1561 extent_end
= extent_start
+
1562 btrfs_file_extent_num_bytes(leaf
, item
);
1564 if (start
< extent_start
|| start
>= extent_end
) {
1566 if (start
< extent_start
) {
1567 if (end
< extent_start
)
1569 em
->end
= extent_end
- 1;
1575 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
1577 em
->start
= extent_start
;
1578 em
->end
= extent_end
- 1;
1579 em
->block_start
= EXTENT_MAP_HOLE
;
1580 em
->block_end
= EXTENT_MAP_HOLE
;
1583 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
1584 em
->block_start
= bytenr
;
1585 em
->block_end
= em
->block_start
+
1586 btrfs_file_extent_num_bytes(leaf
, item
) - 1;
1587 em
->start
= extent_start
;
1588 em
->end
= extent_end
- 1;
1590 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1594 size_t extent_offset
;
1597 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
1599 extent_end
= (extent_start
+ size
- 1) |
1600 ((u64
)root
->sectorsize
- 1);
1601 if (start
< extent_start
|| start
>= extent_end
) {
1603 if (start
< extent_start
) {
1604 if (end
< extent_start
)
1606 em
->end
= extent_end
;
1612 em
->block_start
= EXTENT_MAP_INLINE
;
1613 em
->block_end
= EXTENT_MAP_INLINE
;
1616 em
->start
= extent_start
;
1617 em
->end
= extent_start
+ size
- 1;
1621 extent_offset
= ((u64
)page
->index
<< PAGE_CACHE_SHIFT
) -
1622 extent_start
+ page_offset
;
1623 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- page_offset
,
1624 size
- extent_offset
);
1625 em
->start
= extent_start
+ extent_offset
;
1626 em
->end
= (em
->start
+ copy_size
-1) |
1627 ((u64
)root
->sectorsize
-1);
1629 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
1630 read_extent_buffer(leaf
, map
+ page_offset
, ptr
, copy_size
);
1632 if (em
->start
+ copy_size
<= em
->end
) {
1633 size
= min_t(u64
, em
->end
+ 1 - em
->start
,
1634 PAGE_CACHE_SIZE
- page_offset
) - copy_size
;
1635 memset(map
+ page_offset
+ copy_size
, 0, size
);
1638 flush_dcache_page(page
);
1640 set_extent_uptodate(em_tree
, em
->start
, em
->end
, GFP_NOFS
);
1643 printk("unkknown found_type %d\n", found_type
);
1650 em
->block_start
= EXTENT_MAP_HOLE
;
1651 em
->block_end
= EXTENT_MAP_HOLE
;
1653 btrfs_release_path(root
, path
);
1654 if (em
->start
> start
|| em
->end
< start
) {
1655 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->end
, start
, end
);
1659 ret
= add_extent_mapping(em_tree
, em
);
1660 if (ret
== -EEXIST
) {
1661 free_extent_map(em
);
1664 if (failed_insert
> 5) {
1665 printk("failing to insert %Lu %Lu\n", start
, end
);
1673 btrfs_free_path(path
);
1675 ret
= btrfs_end_transaction(trans
, root
);
1679 mutex_unlock(&root
->fs_info
->fs_mutex
);
1681 free_extent_map(em
);
1683 return ERR_PTR(err
);
1688 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
1690 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
1693 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1694 unsigned from
, unsigned to
)
1696 return extent_prepare_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1697 page
->mapping
->host
, page
, from
, to
,
1701 int btrfs_readpage(struct file
*file
, struct page
*page
)
1703 struct extent_map_tree
*tree
;
1704 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1705 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
1707 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1709 struct extent_map_tree
*tree
;
1712 if (current
->flags
& PF_MEMALLOC
) {
1713 redirty_page_for_writepage(wbc
, page
);
1717 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1718 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
1721 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
1723 struct extent_map_tree
*tree
;
1726 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1727 ret
= try_release_extent_mapping(tree
, page
);
1729 ClearPagePrivate(page
);
1730 set_page_private(page
, 0);
1731 page_cache_release(page
);
1736 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
1738 struct extent_map_tree
*tree
;
1740 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1741 extent_invalidatepage(tree
, page
, offset
);
1742 btrfs_releasepage(page
, GFP_NOFS
);
1746 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1747 * called from a page fault handler when a page is first dirtied. Hence we must
1748 * be careful to check for EOF conditions here. We set the page up correctly
1749 * for a written page which means we get ENOSPC checking when writing into
1750 * holes and correct delalloc and unwritten extent mapping on filesystems that
1751 * support these features.
1753 * We are not allowed to take the i_mutex here so we have to play games to
1754 * protect against truncate races as the page could now be beyond EOF. Because
1755 * vmtruncate() writes the inode size before removing pages, once we have the
1756 * page lock we can determine safely if the page is beyond EOF. If it is not
1757 * beyond EOF, then the page is guaranteed safe against truncation until we
1760 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
1762 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
1768 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
1770 wait_on_page_writeback(page
);
1771 size
= i_size_read(inode
);
1772 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
1774 if ((page
->mapping
!= inode
->i_mapping
) ||
1775 (page_start
> size
)) {
1776 /* page got truncated out from underneath us */
1780 /* page is wholly or partially inside EOF */
1781 if (page_start
+ PAGE_CACHE_SIZE
> size
)
1782 end
= size
& ~PAGE_CACHE_MASK
;
1784 end
= PAGE_CACHE_SIZE
;
1786 ret
= btrfs_cow_one_page(inode
, page
, end
);
1789 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
1794 static void btrfs_truncate(struct inode
*inode
)
1796 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1798 struct btrfs_trans_handle
*trans
;
1801 if (!S_ISREG(inode
->i_mode
))
1803 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1806 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1808 mutex_lock(&root
->fs_info
->fs_mutex
);
1809 trans
= btrfs_start_transaction(root
, 1);
1810 btrfs_set_trans_block_group(trans
, inode
);
1812 /* FIXME, add redo link to tree so we don't leak on crash */
1813 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1814 btrfs_update_inode(trans
, root
, inode
);
1815 nr
= trans
->blocks_used
;
1817 ret
= btrfs_end_transaction(trans
, root
);
1819 mutex_unlock(&root
->fs_info
->fs_mutex
);
1820 btrfs_btree_balance_dirty(root
, nr
);
1823 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1824 unsigned from
, unsigned to
)
1826 return extent_commit_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1827 page
->mapping
->host
, page
, from
, to
);
1830 static int create_subvol(struct btrfs_root
*root
, char *name
, int namelen
)
1832 struct btrfs_trans_handle
*trans
;
1833 struct btrfs_key key
;
1834 struct btrfs_root_item root_item
;
1835 struct btrfs_inode_item
*inode_item
;
1836 struct extent_buffer
*leaf
;
1837 struct btrfs_root
*new_root
;
1838 struct inode
*inode
;
1843 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
1844 unsigned long nr
= 1;
1846 mutex_lock(&root
->fs_info
->fs_mutex
);
1847 trans
= btrfs_start_transaction(root
, 1);
1850 leaf
= btrfs_alloc_free_block(trans
, root
, root
->leafsize
, 0, 0);
1852 return PTR_ERR(leaf
);
1854 btrfs_set_header_nritems(leaf
, 0);
1855 btrfs_set_header_level(leaf
, 0);
1856 btrfs_set_header_bytenr(leaf
, leaf
->start
);
1857 btrfs_set_header_generation(leaf
, trans
->transid
);
1858 btrfs_set_header_owner(leaf
, root
->root_key
.objectid
);
1859 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
1860 (unsigned long)btrfs_header_fsid(leaf
),
1862 btrfs_mark_buffer_dirty(leaf
);
1864 inode_item
= &root_item
.inode
;
1865 memset(inode_item
, 0, sizeof(*inode_item
));
1866 inode_item
->generation
= cpu_to_le64(1);
1867 inode_item
->size
= cpu_to_le64(3);
1868 inode_item
->nlink
= cpu_to_le32(1);
1869 inode_item
->nblocks
= cpu_to_le64(1);
1870 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
1872 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
1873 btrfs_set_root_level(&root_item
, 0);
1874 btrfs_set_root_refs(&root_item
, 1);
1875 btrfs_set_root_used(&root_item
, 0);
1877 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
1878 root_item
.drop_level
= 0;
1880 free_extent_buffer(leaf
);
1883 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1888 btrfs_set_root_dirid(&root_item
, new_dirid
);
1890 key
.objectid
= objectid
;
1892 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1893 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1899 * insert the directory item
1901 key
.offset
= (u64
)-1;
1902 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
1903 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
1904 name
, namelen
, dir
->i_ino
, &key
,
1909 ret
= btrfs_commit_transaction(trans
, root
);
1913 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
1916 trans
= btrfs_start_transaction(new_root
, 1);
1919 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
1920 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
1923 inode
->i_op
= &btrfs_dir_inode_operations
;
1924 inode
->i_fop
= &btrfs_dir_file_operations
;
1925 new_root
->inode
= inode
;
1927 ret
= btrfs_make_empty_dir(trans
, new_root
, new_dirid
, new_dirid
);
1933 ret
= btrfs_update_inode(trans
, new_root
, inode
);
1937 nr
= trans
->blocks_used
;
1938 err
= btrfs_commit_transaction(trans
, root
);
1942 mutex_unlock(&root
->fs_info
->fs_mutex
);
1943 btrfs_btree_balance_dirty(root
, nr
);
1947 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
1949 struct btrfs_trans_handle
*trans
;
1950 struct btrfs_key key
;
1951 struct btrfs_root_item new_root_item
;
1952 struct extent_buffer
*tmp
;
1958 if (!root
->ref_cows
)
1961 down_write(&root
->snap_sem
);
1962 freeze_bdev(root
->fs_info
->sb
->s_bdev
);
1963 thaw_bdev(root
->fs_info
->sb
->s_bdev
, root
->fs_info
->sb
);
1965 mutex_lock(&root
->fs_info
->fs_mutex
);
1966 trans
= btrfs_start_transaction(root
, 1);
1969 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
1973 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
1978 memcpy(&new_root_item
, &root
->root_item
,
1979 sizeof(new_root_item
));
1981 key
.objectid
= objectid
;
1983 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
1985 btrfs_cow_block(trans
, root
, root
->node
, NULL
, 0, &tmp
);
1986 btrfs_set_root_bytenr(&new_root_item
, root
->node
->start
);
1987 btrfs_set_root_level(&new_root_item
, btrfs_header_level(root
->node
));
1989 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
1995 * insert the directory item
1997 key
.offset
= (u64
)-1;
1998 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2000 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2001 &key
, BTRFS_FT_DIR
);
2006 ret
= btrfs_inc_root_ref(trans
, root
);
2010 nr
= trans
->blocks_used
;
2011 err
= btrfs_commit_transaction(trans
, root
);
2016 mutex_unlock(&root
->fs_info
->fs_mutex
);
2017 up_write(&root
->snap_sem
);
2018 btrfs_btree_balance_dirty(root
, nr
);
2022 static unsigned long force_ra(struct address_space
*mapping
,
2023 struct file_ra_state
*ra
, struct file
*file
,
2024 pgoff_t offset
, pgoff_t last_index
)
2028 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2029 req_size
= last_index
- offset
+ 1;
2030 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2033 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2034 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2035 return offset
+ req_size
;
2039 int btrfs_defrag_file(struct file
*file
) {
2040 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2041 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
2043 unsigned long last_index
;
2044 unsigned long ra_index
= 0;
2049 mutex_lock(&inode
->i_mutex
);
2050 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2051 for (i
= 0; i
<= last_index
; i
++) {
2052 if (i
== ra_index
) {
2053 ra_index
= force_ra(inode
->i_mapping
, &file
->f_ra
,
2054 file
, ra_index
, last_index
);
2056 page
= grab_cache_page(inode
->i_mapping
, i
);
2059 if (!PageUptodate(page
)) {
2060 btrfs_readpage(NULL
, page
);
2062 if (!PageUptodate(page
)) {
2064 page_cache_release(page
);
2068 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2069 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2071 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2072 set_extent_delalloc(em_tree
, page_start
,
2073 page_end
, GFP_NOFS
);
2074 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2075 set_page_dirty(page
);
2077 page_cache_release(page
);
2078 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2082 mutex_unlock(&inode
->i_mutex
);
2086 static int btrfs_ioctl_snap_create(struct btrfs_root
*root
, void __user
*arg
)
2088 struct btrfs_ioctl_vol_args vol_args
;
2089 struct btrfs_dir_item
*di
;
2090 struct btrfs_path
*path
;
2094 if (copy_from_user(&vol_args
, arg
, sizeof(vol_args
)))
2097 namelen
= strlen(vol_args
.name
);
2098 if (namelen
> BTRFS_VOL_NAME_MAX
)
2100 if (strchr(vol_args
.name
, '/'))
2103 path
= btrfs_alloc_path();
2107 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2108 mutex_lock(&root
->fs_info
->fs_mutex
);
2109 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2111 vol_args
.name
, namelen
, 0);
2112 mutex_unlock(&root
->fs_info
->fs_mutex
);
2113 btrfs_free_path(path
);
2114 if (di
&& !IS_ERR(di
))
2119 if (root
== root
->fs_info
->tree_root
)
2120 return create_subvol(root
, vol_args
.name
, namelen
);
2121 return create_snapshot(root
, vol_args
.name
, namelen
);
2124 static int btrfs_ioctl_defrag(struct file
*file
)
2126 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2127 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2129 switch (inode
->i_mode
& S_IFMT
) {
2131 mutex_lock(&root
->fs_info
->fs_mutex
);
2132 btrfs_defrag_root(root
, 0);
2133 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2134 mutex_unlock(&root
->fs_info
->fs_mutex
);
2137 btrfs_defrag_file(file
);
2144 long btrfs_ioctl(struct file
*file
, unsigned int
2145 cmd
, unsigned long arg
)
2147 struct btrfs_root
*root
= BTRFS_I(file
->f_path
.dentry
->d_inode
)->root
;
2150 case BTRFS_IOC_SNAP_CREATE
:
2151 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2152 case BTRFS_IOC_DEFRAG
:
2153 return btrfs_ioctl_defrag(file
);
2160 * Called inside transaction, so use GFP_NOFS
2162 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2164 struct btrfs_inode
*ei
;
2166 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2170 return &ei
->vfs_inode
;
2173 void btrfs_destroy_inode(struct inode
*inode
)
2175 WARN_ON(!list_empty(&inode
->i_dentry
));
2176 WARN_ON(inode
->i_data
.nrpages
);
2178 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2181 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2182 static void init_once(struct kmem_cache
* cachep
, void *foo
)
2184 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2185 unsigned long flags
)
2188 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2190 inode_init_once(&ei
->vfs_inode
);
2193 void btrfs_destroy_cachep(void)
2195 if (btrfs_inode_cachep
)
2196 kmem_cache_destroy(btrfs_inode_cachep
);
2197 if (btrfs_trans_handle_cachep
)
2198 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2199 if (btrfs_transaction_cachep
)
2200 kmem_cache_destroy(btrfs_transaction_cachep
);
2201 if (btrfs_bit_radix_cachep
)
2202 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2203 if (btrfs_path_cachep
)
2204 kmem_cache_destroy(btrfs_path_cachep
);
2207 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2208 unsigned long extra_flags
,
2209 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2210 void (*ctor
)(struct kmem_cache
*, void *)
2212 void (*ctor
)(void *, struct kmem_cache
*,
2217 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2218 SLAB_MEM_SPREAD
| extra_flags
), ctor
2219 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2225 int btrfs_init_cachep(void)
2227 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2228 sizeof(struct btrfs_inode
),
2230 if (!btrfs_inode_cachep
)
2232 btrfs_trans_handle_cachep
=
2233 btrfs_cache_create("btrfs_trans_handle_cache",
2234 sizeof(struct btrfs_trans_handle
),
2236 if (!btrfs_trans_handle_cachep
)
2238 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2239 sizeof(struct btrfs_transaction
),
2241 if (!btrfs_transaction_cachep
)
2243 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2244 sizeof(struct btrfs_path
),
2246 if (!btrfs_path_cachep
)
2248 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2249 SLAB_DESTROY_BY_RCU
, NULL
);
2250 if (!btrfs_bit_radix_cachep
)
2254 btrfs_destroy_cachep();
2258 static int btrfs_getattr(struct vfsmount
*mnt
,
2259 struct dentry
*dentry
, struct kstat
*stat
)
2261 struct inode
*inode
= dentry
->d_inode
;
2262 generic_fillattr(inode
, stat
);
2263 stat
->blksize
= 256 * 1024;
2267 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2268 struct inode
* new_dir
,struct dentry
*new_dentry
)
2270 struct btrfs_trans_handle
*trans
;
2271 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2272 struct inode
*new_inode
= new_dentry
->d_inode
;
2273 struct inode
*old_inode
= old_dentry
->d_inode
;
2274 struct timespec ctime
= CURRENT_TIME
;
2275 struct btrfs_path
*path
;
2276 struct btrfs_dir_item
*di
;
2279 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2280 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2284 mutex_lock(&root
->fs_info
->fs_mutex
);
2285 trans
= btrfs_start_transaction(root
, 1);
2287 btrfs_set_trans_block_group(trans
, new_dir
);
2288 path
= btrfs_alloc_path();
2294 old_dentry
->d_inode
->i_nlink
++;
2295 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2296 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2297 old_inode
->i_ctime
= ctime
;
2299 if (S_ISDIR(old_inode
->i_mode
) && old_dir
!= new_dir
) {
2300 struct btrfs_key
*location
= &BTRFS_I(new_dir
)->location
;
2301 struct btrfs_key old_parent_key
;
2302 di
= btrfs_lookup_dir_item(trans
, root
, path
, old_inode
->i_ino
,
2312 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, &old_parent_key
);
2313 ret
= btrfs_del_item(trans
, root
, path
);
2317 btrfs_release_path(root
, path
);
2319 di
= btrfs_lookup_dir_index_item(trans
, root
, path
,
2321 old_parent_key
.objectid
,
2331 ret
= btrfs_del_item(trans
, root
, path
);
2335 btrfs_release_path(root
, path
);
2337 ret
= btrfs_insert_dir_item(trans
, root
, "..", 2,
2338 old_inode
->i_ino
, location
,
2345 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2350 new_inode
->i_ctime
= CURRENT_TIME
;
2351 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2355 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2360 btrfs_free_path(path
);
2361 btrfs_end_transaction(trans
, root
);
2362 mutex_unlock(&root
->fs_info
->fs_mutex
);
2366 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2367 const char *symname
)
2369 struct btrfs_trans_handle
*trans
;
2370 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2371 struct btrfs_path
*path
;
2372 struct btrfs_key key
;
2373 struct inode
*inode
;
2380 struct btrfs_file_extent_item
*ei
;
2381 struct extent_buffer
*leaf
;
2384 name_len
= strlen(symname
) + 1;
2385 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2386 return -ENAMETOOLONG
;
2387 mutex_lock(&root
->fs_info
->fs_mutex
);
2388 trans
= btrfs_start_transaction(root
, 1);
2389 btrfs_set_trans_block_group(trans
, dir
);
2391 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2397 inode
= btrfs_new_inode(trans
, root
, objectid
,
2398 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2399 err
= PTR_ERR(inode
);
2403 btrfs_set_trans_block_group(trans
, inode
);
2404 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2408 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2409 inode
->i_fop
= &btrfs_file_operations
;
2410 inode
->i_op
= &btrfs_file_inode_operations
;
2411 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
2412 inode
->i_mapping
, GFP_NOFS
);
2413 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
2415 dir
->i_sb
->s_dirt
= 1;
2416 btrfs_update_inode_block_group(trans
, inode
);
2417 btrfs_update_inode_block_group(trans
, dir
);
2421 path
= btrfs_alloc_path();
2423 key
.objectid
= inode
->i_ino
;
2425 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2426 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2427 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2433 leaf
= path
->nodes
[0];
2434 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2435 struct btrfs_file_extent_item
);
2436 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2437 btrfs_set_file_extent_type(leaf
, ei
,
2438 BTRFS_FILE_EXTENT_INLINE
);
2439 ptr
= btrfs_file_extent_inline_start(ei
);
2440 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
2441 btrfs_mark_buffer_dirty(leaf
);
2442 btrfs_free_path(path
);
2444 inode
->i_op
= &btrfs_symlink_inode_operations
;
2445 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2446 inode
->i_size
= name_len
- 1;
2447 err
= btrfs_update_inode(trans
, root
, inode
);
2452 nr
= trans
->blocks_used
;
2453 btrfs_end_transaction(trans
, root
);
2454 mutex_unlock(&root
->fs_info
->fs_mutex
);
2456 inode_dec_link_count(inode
);
2459 btrfs_btree_balance_dirty(root
, nr
);
2463 static struct inode_operations btrfs_dir_inode_operations
= {
2464 .lookup
= btrfs_lookup
,
2465 .create
= btrfs_create
,
2466 .unlink
= btrfs_unlink
,
2468 .mkdir
= btrfs_mkdir
,
2469 .rmdir
= btrfs_rmdir
,
2470 .rename
= btrfs_rename
,
2471 .symlink
= btrfs_symlink
,
2472 .setattr
= btrfs_setattr
,
2473 .mknod
= btrfs_mknod
,
2476 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2477 .lookup
= btrfs_lookup
,
2480 static struct file_operations btrfs_dir_file_operations
= {
2481 .llseek
= generic_file_llseek
,
2482 .read
= generic_read_dir
,
2483 .readdir
= btrfs_readdir
,
2484 .unlocked_ioctl
= btrfs_ioctl
,
2485 #ifdef CONFIG_COMPAT
2486 .compat_ioctl
= btrfs_ioctl
,
2490 static struct extent_map_ops btrfs_extent_map_ops
= {
2491 .fill_delalloc
= run_delalloc_range
,
2492 .writepage_io_hook
= btrfs_writepage_io_hook
,
2493 .readpage_io_hook
= btrfs_readpage_io_hook
,
2494 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2497 static struct address_space_operations btrfs_aops
= {
2498 .readpage
= btrfs_readpage
,
2499 .writepage
= btrfs_writepage
,
2500 .sync_page
= block_sync_page
,
2501 .prepare_write
= btrfs_prepare_write
,
2502 .commit_write
= btrfs_commit_write
,
2504 .invalidatepage
= btrfs_invalidatepage
,
2505 .releasepage
= btrfs_releasepage
,
2506 .set_page_dirty
= __set_page_dirty_nobuffers
,
2509 static struct address_space_operations btrfs_symlink_aops
= {
2510 .readpage
= btrfs_readpage
,
2511 .writepage
= btrfs_writepage
,
2512 .invalidatepage
= btrfs_invalidatepage
,
2513 .releasepage
= btrfs_releasepage
,
2516 static struct inode_operations btrfs_file_inode_operations
= {
2517 .truncate
= btrfs_truncate
,
2518 .getattr
= btrfs_getattr
,
2519 .setattr
= btrfs_setattr
,
2522 static struct inode_operations btrfs_special_inode_operations
= {
2523 .getattr
= btrfs_getattr
,
2524 .setattr
= btrfs_setattr
,
2527 static struct inode_operations btrfs_symlink_inode_operations
= {
2528 .readlink
= generic_readlink
,
2529 .follow_link
= page_follow_link_light
,
2530 .put_link
= page_put_link
,