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>
35 #include <linux/xattr.h>
38 #include "transaction.h"
39 #include "btrfs_inode.h"
41 #include "print-tree.h"
43 struct btrfs_iget_args
{
45 struct btrfs_root
*root
;
48 static struct inode_operations btrfs_dir_inode_operations
;
49 static struct inode_operations btrfs_symlink_inode_operations
;
50 static struct inode_operations btrfs_dir_ro_inode_operations
;
51 static struct inode_operations btrfs_special_inode_operations
;
52 static struct inode_operations btrfs_file_inode_operations
;
53 static struct address_space_operations btrfs_aops
;
54 static struct address_space_operations btrfs_symlink_aops
;
55 static struct file_operations btrfs_dir_file_operations
;
56 static struct extent_map_ops btrfs_extent_map_ops
;
58 static struct kmem_cache
*btrfs_inode_cachep
;
59 struct kmem_cache
*btrfs_trans_handle_cachep
;
60 struct kmem_cache
*btrfs_transaction_cachep
;
61 struct kmem_cache
*btrfs_bit_radix_cachep
;
62 struct kmem_cache
*btrfs_path_cachep
;
65 static unsigned char btrfs_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
66 [S_IFREG
>> S_SHIFT
] = BTRFS_FT_REG_FILE
,
67 [S_IFDIR
>> S_SHIFT
] = BTRFS_FT_DIR
,
68 [S_IFCHR
>> S_SHIFT
] = BTRFS_FT_CHRDEV
,
69 [S_IFBLK
>> S_SHIFT
] = BTRFS_FT_BLKDEV
,
70 [S_IFIFO
>> S_SHIFT
] = BTRFS_FT_FIFO
,
71 [S_IFSOCK
>> S_SHIFT
] = BTRFS_FT_SOCK
,
72 [S_IFLNK
>> S_SHIFT
] = BTRFS_FT_SYMLINK
,
75 static int cow_file_range(struct inode
*inode
, u64 start
, u64 end
)
77 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
78 struct btrfs_trans_handle
*trans
;
82 u64 blocksize
= root
->sectorsize
;
86 trans
= btrfs_start_transaction(root
, 1);
88 btrfs_set_trans_block_group(trans
, inode
);
90 num_bytes
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
91 num_bytes
= max(blocksize
, num_bytes
);
92 ret
= btrfs_drop_extents(trans
, root
, inode
,
93 start
, start
+ num_bytes
, start
, &alloc_hint
);
95 if (alloc_hint
== EXTENT_MAP_INLINE
)
98 while(num_bytes
> 0) {
99 cur_alloc_size
= min(num_bytes
, root
->fs_info
->max_extent
);
100 ret
= btrfs_alloc_extent(trans
, root
, cur_alloc_size
,
101 root
->root_key
.objectid
,
103 inode
->i_ino
, start
, 0,
104 alloc_hint
, (u64
)-1, &ins
, 1);
109 ret
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
110 start
, ins
.objectid
, ins
.offset
,
112 num_bytes
-= cur_alloc_size
;
113 alloc_hint
= ins
.objectid
+ ins
.offset
;
114 start
+= cur_alloc_size
;
117 btrfs_end_transaction(trans
, root
);
121 static int run_delalloc_nocow(struct inode
*inode
, u64 start
, u64 end
)
127 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
128 struct extent_buffer
*leaf
;
130 struct btrfs_path
*path
;
131 struct btrfs_file_extent_item
*item
;
134 struct btrfs_key found_key
;
136 path
= btrfs_alloc_path();
139 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
140 inode
->i_ino
, start
, 0);
142 btrfs_free_path(path
);
148 if (path
->slots
[0] == 0)
153 leaf
= path
->nodes
[0];
154 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
155 struct btrfs_file_extent_item
);
157 /* are we inside the extent that was found? */
158 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
159 found_type
= btrfs_key_type(&found_key
);
160 if (found_key
.objectid
!= inode
->i_ino
||
161 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
165 found_type
= btrfs_file_extent_type(leaf
, item
);
166 extent_start
= found_key
.offset
;
167 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
168 extent_end
= extent_start
+
169 btrfs_file_extent_num_bytes(leaf
, item
);
172 if (start
< extent_start
|| start
>= extent_end
)
175 cow_end
= min(end
, extent_end
- 1);
176 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
180 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
181 if (btrfs_count_snapshots_in_path(root
, path
, bytenr
) != 1) {
186 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
191 btrfs_free_path(path
);
194 btrfs_release_path(root
, path
);
198 cow_file_range(inode
, start
, cow_end
);
203 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
205 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
208 mutex_lock(&root
->fs_info
->fs_mutex
);
209 if (btrfs_test_opt(root
, NODATACOW
))
210 ret
= run_delalloc_nocow(inode
, start
, end
);
212 ret
= cow_file_range(inode
, start
, end
);
213 mutex_unlock(&root
->fs_info
->fs_mutex
);
217 int btrfs_writepage_io_hook(struct page
*page
, u64 start
, u64 end
)
219 struct inode
*inode
= page
->mapping
->host
;
220 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
221 struct btrfs_trans_handle
*trans
;
224 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
225 size_t offset
= start
- page_start
;
227 if (btrfs_test_opt(root
, NODATASUM
))
230 mutex_lock(&root
->fs_info
->fs_mutex
);
231 trans
= btrfs_start_transaction(root
, 1);
232 btrfs_set_trans_block_group(trans
, inode
);
234 btrfs_csum_file_block(trans
, root
, inode
, inode
->i_ino
,
235 start
, kaddr
+ offset
, end
- start
+ 1);
237 ret
= btrfs_end_transaction(trans
, root
);
239 mutex_unlock(&root
->fs_info
->fs_mutex
);
243 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
246 struct inode
*inode
= page
->mapping
->host
;
247 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
248 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
249 struct btrfs_csum_item
*item
;
250 struct btrfs_path
*path
= NULL
;
253 if (btrfs_test_opt(root
, NODATASUM
))
256 mutex_lock(&root
->fs_info
->fs_mutex
);
257 path
= btrfs_alloc_path();
258 item
= btrfs_lookup_csum(NULL
, root
, path
, inode
->i_ino
, start
, 0);
261 /* a csum that isn't present is a preallocated region. */
262 if (ret
== -ENOENT
|| ret
== -EFBIG
)
267 read_extent_buffer(path
->nodes
[0], &csum
, (unsigned long)item
,
269 set_state_private(em_tree
, start
, csum
);
272 btrfs_free_path(path
);
273 mutex_unlock(&root
->fs_info
->fs_mutex
);
277 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
)
279 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
280 struct inode
*inode
= page
->mapping
->host
;
281 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
285 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
289 if (btrfs_test_opt(root
, NODATASUM
))
292 ret
= get_state_private(em_tree
, start
, &private);
293 local_irq_save(flags
);
294 kaddr
= kmap_atomic(page
, KM_IRQ0
);
298 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
299 btrfs_csum_final(csum
, (char *)&csum
);
300 if (csum
!= private) {
303 kunmap_atomic(kaddr
, KM_IRQ0
);
304 local_irq_restore(flags
);
308 printk("btrfs csum failed ino %lu off %llu\n",
309 page
->mapping
->host
->i_ino
, (unsigned long long)start
);
310 memset(kaddr
+ offset
, 1, end
- start
+ 1);
311 flush_dcache_page(page
);
312 kunmap_atomic(kaddr
, KM_IRQ0
);
313 local_irq_restore(flags
);
317 void btrfs_read_locked_inode(struct inode
*inode
)
319 struct btrfs_path
*path
;
320 struct extent_buffer
*leaf
;
321 struct btrfs_inode_item
*inode_item
;
322 struct btrfs_inode_timespec
*tspec
;
323 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
324 struct btrfs_key location
;
325 u64 alloc_group_block
;
329 path
= btrfs_alloc_path();
331 mutex_lock(&root
->fs_info
->fs_mutex
);
333 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
334 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
338 leaf
= path
->nodes
[0];
339 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
340 struct btrfs_inode_item
);
342 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
343 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
344 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
345 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
346 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
348 tspec
= btrfs_inode_atime(inode_item
);
349 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
350 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
352 tspec
= btrfs_inode_mtime(inode_item
);
353 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
354 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
356 tspec
= btrfs_inode_ctime(inode_item
);
357 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
358 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
360 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
361 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
363 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
365 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
366 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
369 btrfs_free_path(path
);
372 mutex_unlock(&root
->fs_info
->fs_mutex
);
374 switch (inode
->i_mode
& S_IFMT
) {
376 inode
->i_mapping
->a_ops
= &btrfs_aops
;
377 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
378 inode
->i_fop
= &btrfs_file_operations
;
379 inode
->i_op
= &btrfs_file_inode_operations
;
382 inode
->i_fop
= &btrfs_dir_file_operations
;
383 if (root
== root
->fs_info
->tree_root
)
384 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
386 inode
->i_op
= &btrfs_dir_inode_operations
;
389 inode
->i_op
= &btrfs_symlink_inode_operations
;
390 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
393 init_special_inode(inode
, inode
->i_mode
, rdev
);
399 btrfs_release_path(root
, path
);
400 btrfs_free_path(path
);
401 mutex_unlock(&root
->fs_info
->fs_mutex
);
402 make_bad_inode(inode
);
405 static void fill_inode_item(struct extent_buffer
*leaf
,
406 struct btrfs_inode_item
*item
,
409 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
410 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
411 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
412 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
413 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
415 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
416 inode
->i_atime
.tv_sec
);
417 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
418 inode
->i_atime
.tv_nsec
);
420 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
421 inode
->i_mtime
.tv_sec
);
422 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
423 inode
->i_mtime
.tv_nsec
);
425 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
426 inode
->i_ctime
.tv_sec
);
427 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
428 inode
->i_ctime
.tv_nsec
);
430 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
431 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
432 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
433 btrfs_set_inode_block_group(leaf
, item
,
434 BTRFS_I(inode
)->block_group
->key
.objectid
);
437 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
438 struct btrfs_root
*root
,
441 struct btrfs_inode_item
*inode_item
;
442 struct btrfs_path
*path
;
443 struct extent_buffer
*leaf
;
446 path
= btrfs_alloc_path();
448 ret
= btrfs_lookup_inode(trans
, root
, path
,
449 &BTRFS_I(inode
)->location
, 1);
456 leaf
= path
->nodes
[0];
457 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
458 struct btrfs_inode_item
);
460 fill_inode_item(leaf
, inode_item
, inode
);
461 btrfs_mark_buffer_dirty(leaf
);
462 btrfs_set_inode_last_trans(trans
, inode
);
465 btrfs_release_path(root
, path
);
466 btrfs_free_path(path
);
471 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
472 struct btrfs_root
*root
,
474 struct dentry
*dentry
)
476 struct btrfs_path
*path
;
477 const char *name
= dentry
->d_name
.name
;
478 int name_len
= dentry
->d_name
.len
;
480 struct extent_buffer
*leaf
;
481 struct btrfs_dir_item
*di
;
482 struct btrfs_key key
;
484 path
= btrfs_alloc_path();
490 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
500 leaf
= path
->nodes
[0];
501 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
502 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
505 btrfs_release_path(root
, path
);
507 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
508 key
.objectid
, name
, name_len
, -1);
517 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
519 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
520 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
521 dentry
->d_inode
->i_ino
,
522 dentry
->d_parent
->d_inode
->i_ino
);
524 printk("failed to delete reference to %.*s, "
525 "inode %lu parent %lu\n", name_len
, name
,
526 dentry
->d_inode
->i_ino
,
527 dentry
->d_parent
->d_inode
->i_ino
);
530 btrfs_free_path(path
);
532 dir
->i_size
-= name_len
* 2;
533 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
534 btrfs_update_inode(trans
, root
, dir
);
535 drop_nlink(dentry
->d_inode
);
536 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
537 dir
->i_sb
->s_dirt
= 1;
542 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
544 struct btrfs_root
*root
;
545 struct btrfs_trans_handle
*trans
;
549 root
= BTRFS_I(dir
)->root
;
550 mutex_lock(&root
->fs_info
->fs_mutex
);
551 trans
= btrfs_start_transaction(root
, 1);
553 btrfs_set_trans_block_group(trans
, dir
);
554 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
555 nr
= trans
->blocks_used
;
557 btrfs_end_transaction(trans
, root
);
558 mutex_unlock(&root
->fs_info
->fs_mutex
);
559 btrfs_btree_balance_dirty(root
, nr
);
564 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
566 struct inode
*inode
= dentry
->d_inode
;
569 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
570 struct btrfs_trans_handle
*trans
;
573 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
576 mutex_lock(&root
->fs_info
->fs_mutex
);
577 trans
= btrfs_start_transaction(root
, 1);
578 btrfs_set_trans_block_group(trans
, dir
);
580 /* now the directory is empty */
581 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
586 nr
= trans
->blocks_used
;
587 ret
= btrfs_end_transaction(trans
, root
);
588 mutex_unlock(&root
->fs_info
->fs_mutex
);
589 btrfs_btree_balance_dirty(root
, nr
);
596 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
597 struct btrfs_root
*root
,
600 struct btrfs_path
*path
;
605 path
= btrfs_alloc_path();
607 ret
= btrfs_lookup_inode(trans
, root
, path
,
608 &BTRFS_I(inode
)->location
, -1);
612 ret
= btrfs_del_item(trans
, root
, path
);
613 btrfs_free_path(path
);
618 * this can truncate away extent items, csum items and directory items.
619 * It starts at a high offset and removes keys until it can't find
620 * any higher than i_size.
622 * csum items that cross the new i_size are truncated to the new size
625 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
626 struct btrfs_root
*root
,
630 struct btrfs_path
*path
;
631 struct btrfs_key key
;
632 struct btrfs_key found_key
;
634 struct extent_buffer
*leaf
;
635 struct btrfs_file_extent_item
*fi
;
636 u64 extent_start
= 0;
637 u64 extent_num_bytes
= 0;
643 int extent_type
= -1;
645 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
646 path
= btrfs_alloc_path();
650 /* FIXME, add redo link to tree so we don't leak on crash */
651 key
.objectid
= inode
->i_ino
;
652 key
.offset
= (u64
)-1;
656 btrfs_init_path(path
);
658 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
663 BUG_ON(path
->slots
[0] == 0);
666 leaf
= path
->nodes
[0];
667 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
668 found_type
= btrfs_key_type(&found_key
);
670 if (found_key
.objectid
!= inode
->i_ino
)
673 if (found_type
!= BTRFS_CSUM_ITEM_KEY
&&
674 found_type
!= BTRFS_DIR_ITEM_KEY
&&
675 found_type
!= BTRFS_DIR_INDEX_KEY
&&
676 found_type
!= BTRFS_EXTENT_DATA_KEY
)
679 item_end
= found_key
.offset
;
680 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
681 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
682 struct btrfs_file_extent_item
);
683 extent_type
= btrfs_file_extent_type(leaf
, fi
);
684 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
686 btrfs_file_extent_num_bytes(leaf
, fi
);
687 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
688 struct btrfs_item
*item
= btrfs_item_nr(leaf
,
690 item_end
+= btrfs_file_extent_inline_len(leaf
,
695 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
696 ret
= btrfs_csum_truncate(trans
, root
, path
,
700 if (item_end
< inode
->i_size
) {
701 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
702 found_type
= BTRFS_INODE_ITEM_KEY
;
703 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
704 found_type
= BTRFS_CSUM_ITEM_KEY
;
705 } else if (found_type
) {
710 btrfs_set_key_type(&key
, found_type
);
711 btrfs_release_path(root
, path
);
714 if (found_key
.offset
>= inode
->i_size
)
720 /* FIXME, shrink the extent if the ref count is only 1 */
721 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
724 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
726 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
729 btrfs_file_extent_num_bytes(leaf
, fi
);
730 extent_num_bytes
= inode
->i_size
-
731 found_key
.offset
+ root
->sectorsize
- 1;
732 btrfs_set_file_extent_num_bytes(leaf
, fi
,
734 num_dec
= (orig_num_bytes
-
735 extent_num_bytes
) >> 9;
736 if (extent_start
!= 0) {
737 inode
->i_blocks
-= num_dec
;
739 btrfs_mark_buffer_dirty(leaf
);
742 btrfs_file_extent_disk_num_bytes(leaf
,
744 /* FIXME blocksize != 4096 */
745 num_dec
= btrfs_file_extent_num_bytes(leaf
,
747 if (extent_start
!= 0) {
749 inode
->i_blocks
-= num_dec
;
751 root_gen
= btrfs_header_generation(leaf
);
752 root_owner
= btrfs_header_owner(leaf
);
754 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
&&
756 u32 newsize
= inode
->i_size
- found_key
.offset
;
757 newsize
= btrfs_file_extent_calc_inline_size(newsize
);
758 ret
= btrfs_truncate_item(trans
, root
, path
,
764 ret
= btrfs_del_item(trans
, root
, path
);
770 btrfs_release_path(root
, path
);
772 ret
= btrfs_free_extent(trans
, root
, extent_start
,
775 root_gen
, inode
->i_ino
,
776 found_key
.offset
, 0);
782 btrfs_release_path(root
, path
);
783 btrfs_free_path(path
);
784 inode
->i_sb
->s_dirt
= 1;
788 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
793 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
794 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
795 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
797 set_page_extent_mapped(page
);
799 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
800 set_extent_delalloc(&BTRFS_I(inode
)->extent_tree
, page_start
,
802 if (zero_start
!= PAGE_CACHE_SIZE
) {
804 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
805 flush_dcache_page(page
);
808 set_page_dirty(page
);
809 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
815 * taken from block_truncate_page, but does cow as it zeros out
816 * any bytes left in the last page in the file.
818 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
820 struct inode
*inode
= mapping
->host
;
821 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
822 u32 blocksize
= root
->sectorsize
;
823 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
824 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
829 if ((offset
& (blocksize
- 1)) == 0)
832 down_read(&root
->snap_sem
);
834 page
= grab_cache_page(mapping
, index
);
837 if (!PageUptodate(page
)) {
838 ret
= btrfs_readpage(NULL
, page
);
840 if (!PageUptodate(page
)) {
845 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
847 ret
= btrfs_cow_one_page(inode
, page
, offset
);
850 page_cache_release(page
);
851 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
856 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
858 struct inode
*inode
= dentry
->d_inode
;
861 err
= inode_change_ok(inode
, attr
);
865 if (S_ISREG(inode
->i_mode
) &&
866 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
867 struct btrfs_trans_handle
*trans
;
868 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
869 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
871 u64 mask
= root
->sectorsize
- 1;
872 u64 pos
= (inode
->i_size
+ mask
) & ~mask
;
873 u64 block_end
= attr
->ia_size
| mask
;
877 if (attr
->ia_size
<= pos
)
880 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
882 lock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
883 hole_size
= (attr
->ia_size
- pos
+ mask
) & ~mask
;
885 mutex_lock(&root
->fs_info
->fs_mutex
);
886 trans
= btrfs_start_transaction(root
, 1);
887 btrfs_set_trans_block_group(trans
, inode
);
888 err
= btrfs_drop_extents(trans
, root
, inode
,
889 pos
, pos
+ hole_size
, pos
,
892 if (alloc_hint
!= EXTENT_MAP_INLINE
) {
893 err
= btrfs_insert_file_extent(trans
, root
,
895 pos
, 0, 0, hole_size
);
897 btrfs_end_transaction(trans
, root
);
898 mutex_unlock(&root
->fs_info
->fs_mutex
);
899 unlock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
904 err
= inode_setattr(inode
, attr
);
908 void btrfs_delete_inode(struct inode
*inode
)
910 struct btrfs_trans_handle
*trans
;
911 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
915 truncate_inode_pages(&inode
->i_data
, 0);
916 if (is_bad_inode(inode
)) {
921 mutex_lock(&root
->fs_info
->fs_mutex
);
922 trans
= btrfs_start_transaction(root
, 1);
924 btrfs_set_trans_block_group(trans
, inode
);
925 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
928 ret
= btrfs_delete_xattrs(trans
, root
, inode
);
931 ret
= btrfs_free_inode(trans
, root
, inode
);
934 nr
= trans
->blocks_used
;
936 btrfs_end_transaction(trans
, root
);
937 mutex_unlock(&root
->fs_info
->fs_mutex
);
938 btrfs_btree_balance_dirty(root
, nr
);
942 nr
= trans
->blocks_used
;
943 btrfs_end_transaction(trans
, root
);
944 mutex_unlock(&root
->fs_info
->fs_mutex
);
945 btrfs_btree_balance_dirty(root
, nr
);
951 * this returns the key found in the dir entry in the location pointer.
952 * If no dir entries were found, location->objectid is 0.
954 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
955 struct btrfs_key
*location
)
957 const char *name
= dentry
->d_name
.name
;
958 int namelen
= dentry
->d_name
.len
;
959 struct btrfs_dir_item
*di
;
960 struct btrfs_path
*path
;
961 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
964 if (namelen
== 1 && strcmp(name
, ".") == 0) {
965 location
->objectid
= dir
->i_ino
;
966 location
->type
= BTRFS_INODE_ITEM_KEY
;
967 location
->offset
= 0;
970 path
= btrfs_alloc_path();
973 if (namelen
== 2 && strcmp(name
, "..") == 0) {
974 struct btrfs_key key
;
975 struct extent_buffer
*leaf
;
979 key
.objectid
= dir
->i_ino
;
980 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
982 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
986 leaf
= path
->nodes
[0];
987 slot
= path
->slots
[0];
988 nritems
= btrfs_header_nritems(leaf
);
992 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
993 if (key
.objectid
!= dir
->i_ino
||
994 key
.type
!= BTRFS_INODE_REF_KEY
) {
997 location
->objectid
= key
.offset
;
998 location
->type
= BTRFS_INODE_ITEM_KEY
;
999 location
->offset
= 0;
1003 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
1007 if (!di
|| IS_ERR(di
)) {
1010 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
1012 btrfs_free_path(path
);
1015 location
->objectid
= 0;
1020 * when we hit a tree root in a directory, the btrfs part of the inode
1021 * needs to be changed to reflect the root directory of the tree root. This
1022 * is kind of like crossing a mount point.
1024 static int fixup_tree_root_location(struct btrfs_root
*root
,
1025 struct btrfs_key
*location
,
1026 struct btrfs_root
**sub_root
,
1027 struct dentry
*dentry
)
1029 struct btrfs_path
*path
;
1030 struct btrfs_root_item
*ri
;
1032 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
1034 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1037 path
= btrfs_alloc_path();
1039 mutex_lock(&root
->fs_info
->fs_mutex
);
1041 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
1042 dentry
->d_name
.name
,
1043 dentry
->d_name
.len
);
1044 if (IS_ERR(*sub_root
))
1045 return PTR_ERR(*sub_root
);
1047 ri
= &(*sub_root
)->root_item
;
1048 location
->objectid
= btrfs_root_dirid(ri
);
1049 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1050 location
->offset
= 0;
1052 btrfs_free_path(path
);
1053 mutex_unlock(&root
->fs_info
->fs_mutex
);
1057 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
1059 struct btrfs_iget_args
*args
= p
;
1060 inode
->i_ino
= args
->ino
;
1061 BTRFS_I(inode
)->root
= args
->root
;
1062 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1063 inode
->i_mapping
, GFP_NOFS
);
1067 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
1069 struct btrfs_iget_args
*args
= opaque
;
1070 return (args
->ino
== inode
->i_ino
&&
1071 args
->root
== BTRFS_I(inode
)->root
);
1074 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1075 struct btrfs_root
*root
)
1077 struct inode
*inode
;
1078 struct btrfs_iget_args args
;
1079 args
.ino
= objectid
;
1082 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
1083 btrfs_init_locked_inode
,
1088 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
1089 struct nameidata
*nd
)
1091 struct inode
* inode
;
1092 struct btrfs_inode
*bi
= BTRFS_I(dir
);
1093 struct btrfs_root
*root
= bi
->root
;
1094 struct btrfs_root
*sub_root
= root
;
1095 struct btrfs_key location
;
1098 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
1099 return ERR_PTR(-ENAMETOOLONG
);
1101 mutex_lock(&root
->fs_info
->fs_mutex
);
1102 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
1103 mutex_unlock(&root
->fs_info
->fs_mutex
);
1106 return ERR_PTR(ret
);
1109 if (location
.objectid
) {
1110 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
1113 return ERR_PTR(ret
);
1115 return ERR_PTR(-ENOENT
);
1116 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
1119 return ERR_PTR(-EACCES
);
1120 if (inode
->i_state
& I_NEW
) {
1121 /* the inode and parent dir are two different roots */
1122 if (sub_root
!= root
) {
1124 sub_root
->inode
= inode
;
1126 BTRFS_I(inode
)->root
= sub_root
;
1127 memcpy(&BTRFS_I(inode
)->location
, &location
,
1129 btrfs_read_locked_inode(inode
);
1130 unlock_new_inode(inode
);
1133 return d_splice_alias(inode
, dentry
);
1136 static unsigned char btrfs_filetype_table
[] = {
1137 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1140 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
1142 struct inode
*inode
= filp
->f_path
.dentry
->d_inode
;
1143 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1144 struct btrfs_item
*item
;
1145 struct btrfs_dir_item
*di
;
1146 struct btrfs_key key
;
1147 struct btrfs_key found_key
;
1148 struct btrfs_path
*path
;
1151 struct extent_buffer
*leaf
;
1154 unsigned char d_type
;
1159 int key_type
= BTRFS_DIR_INDEX_KEY
;
1164 /* FIXME, use a real flag for deciding about the key type */
1165 if (root
->fs_info
->tree_root
== root
)
1166 key_type
= BTRFS_DIR_ITEM_KEY
;
1168 /* special case for "." */
1169 if (filp
->f_pos
== 0) {
1170 over
= filldir(dirent
, ".", 1,
1178 mutex_lock(&root
->fs_info
->fs_mutex
);
1179 key
.objectid
= inode
->i_ino
;
1180 path
= btrfs_alloc_path();
1183 /* special case for .., just use the back ref */
1184 if (filp
->f_pos
== 1) {
1185 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1187 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1189 leaf
= path
->nodes
[0];
1190 slot
= path
->slots
[0];
1191 nritems
= btrfs_header_nritems(leaf
);
1192 if (slot
>= nritems
) {
1193 btrfs_release_path(root
, path
);
1194 goto read_dir_items
;
1196 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1197 btrfs_release_path(root
, path
);
1198 if (found_key
.objectid
!= key
.objectid
||
1199 found_key
.type
!= BTRFS_INODE_REF_KEY
)
1200 goto read_dir_items
;
1201 over
= filldir(dirent
, "..", 2,
1202 2, found_key
.offset
, DT_DIR
);
1209 btrfs_set_key_type(&key
, key_type
);
1210 key
.offset
= filp
->f_pos
;
1212 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1217 leaf
= path
->nodes
[0];
1218 nritems
= btrfs_header_nritems(leaf
);
1219 slot
= path
->slots
[0];
1220 if (advance
|| slot
>= nritems
) {
1221 if (slot
>= nritems
-1) {
1222 ret
= btrfs_next_leaf(root
, path
);
1225 leaf
= path
->nodes
[0];
1226 nritems
= btrfs_header_nritems(leaf
);
1227 slot
= path
->slots
[0];
1234 item
= btrfs_item_nr(leaf
, slot
);
1235 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1237 if (found_key
.objectid
!= key
.objectid
)
1239 if (btrfs_key_type(&found_key
) != key_type
)
1241 if (found_key
.offset
< filp
->f_pos
)
1244 filp
->f_pos
= found_key
.offset
;
1246 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1248 di_total
= btrfs_item_size(leaf
, item
);
1249 while(di_cur
< di_total
) {
1250 struct btrfs_key location
;
1252 name_len
= btrfs_dir_name_len(leaf
, di
);
1253 if (name_len
< 32) {
1254 name_ptr
= tmp_name
;
1256 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1259 read_extent_buffer(leaf
, name_ptr
,
1260 (unsigned long)(di
+ 1), name_len
);
1262 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1263 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1265 over
= filldir(dirent
, name_ptr
, name_len
,
1270 if (name_ptr
!= tmp_name
)
1275 di_len
= btrfs_dir_name_len(leaf
, di
) +
1276 btrfs_dir_data_len(leaf
, di
) +sizeof(*di
);
1278 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1285 btrfs_release_path(root
, path
);
1286 btrfs_free_path(path
);
1287 mutex_unlock(&root
->fs_info
->fs_mutex
);
1291 int btrfs_write_inode(struct inode
*inode
, int wait
)
1293 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1294 struct btrfs_trans_handle
*trans
;
1298 mutex_lock(&root
->fs_info
->fs_mutex
);
1299 trans
= btrfs_start_transaction(root
, 1);
1300 btrfs_set_trans_block_group(trans
, inode
);
1301 ret
= btrfs_commit_transaction(trans
, root
);
1302 mutex_unlock(&root
->fs_info
->fs_mutex
);
1308 * This is somewhat expensive, updating the tree every time the
1309 * inode changes. But, it is most likely to find the inode in cache.
1310 * FIXME, needs more benchmarking...there are no reasons other than performance
1311 * to keep or drop this code.
1313 void btrfs_dirty_inode(struct inode
*inode
)
1315 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1316 struct btrfs_trans_handle
*trans
;
1318 mutex_lock(&root
->fs_info
->fs_mutex
);
1319 trans
= btrfs_start_transaction(root
, 1);
1320 btrfs_set_trans_block_group(trans
, inode
);
1321 btrfs_update_inode(trans
, root
, inode
);
1322 btrfs_end_transaction(trans
, root
);
1323 mutex_unlock(&root
->fs_info
->fs_mutex
);
1326 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1327 struct btrfs_root
*root
,
1329 struct btrfs_block_group_cache
*group
,
1332 struct inode
*inode
;
1333 struct btrfs_inode_item
*inode_item
;
1334 struct btrfs_key
*location
;
1335 struct btrfs_path
*path
;
1339 path
= btrfs_alloc_path();
1342 inode
= new_inode(root
->fs_info
->sb
);
1344 return ERR_PTR(-ENOMEM
);
1346 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1347 inode
->i_mapping
, GFP_NOFS
);
1348 BTRFS_I(inode
)->root
= root
;
1354 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1355 BTRFS_I(inode
)->block_group
= group
;
1357 ret
= btrfs_insert_empty_inode(trans
, root
, path
, objectid
);
1361 inode
->i_uid
= current
->fsuid
;
1362 inode
->i_gid
= current
->fsgid
;
1363 inode
->i_mode
= mode
;
1364 inode
->i_ino
= objectid
;
1365 inode
->i_blocks
= 0;
1366 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1367 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1368 struct btrfs_inode_item
);
1369 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1370 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1371 btrfs_free_path(path
);
1373 location
= &BTRFS_I(inode
)->location
;
1374 location
->objectid
= objectid
;
1375 location
->offset
= 0;
1376 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1378 insert_inode_hash(inode
);
1381 btrfs_free_path(path
);
1382 return ERR_PTR(ret
);
1385 static inline u8
btrfs_inode_type(struct inode
*inode
)
1387 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1390 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1391 struct dentry
*dentry
, struct inode
*inode
)
1394 struct btrfs_key key
;
1395 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1396 struct inode
*parent_inode
;
1398 key
.objectid
= inode
->i_ino
;
1399 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1402 ret
= btrfs_insert_dir_item(trans
, root
,
1403 dentry
->d_name
.name
, dentry
->d_name
.len
,
1404 dentry
->d_parent
->d_inode
->i_ino
,
1405 &key
, btrfs_inode_type(inode
));
1407 ret
= btrfs_insert_inode_ref(trans
, root
,
1408 dentry
->d_name
.name
,
1411 dentry
->d_parent
->d_inode
->i_ino
);
1412 parent_inode
= dentry
->d_parent
->d_inode
;
1413 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1414 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1415 ret
= btrfs_update_inode(trans
, root
,
1416 dentry
->d_parent
->d_inode
);
1421 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1422 struct dentry
*dentry
, struct inode
*inode
)
1424 int err
= btrfs_add_link(trans
, dentry
, inode
);
1426 d_instantiate(dentry
, inode
);
1434 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1435 int mode
, dev_t rdev
)
1437 struct btrfs_trans_handle
*trans
;
1438 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1439 struct inode
*inode
;
1445 if (!new_valid_dev(rdev
))
1448 mutex_lock(&root
->fs_info
->fs_mutex
);
1449 trans
= btrfs_start_transaction(root
, 1);
1450 btrfs_set_trans_block_group(trans
, dir
);
1452 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1458 inode
= btrfs_new_inode(trans
, root
, objectid
,
1459 BTRFS_I(dir
)->block_group
, mode
);
1460 err
= PTR_ERR(inode
);
1464 btrfs_set_trans_block_group(trans
, inode
);
1465 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1469 inode
->i_op
= &btrfs_special_inode_operations
;
1470 init_special_inode(inode
, inode
->i_mode
, rdev
);
1471 btrfs_update_inode(trans
, root
, inode
);
1473 dir
->i_sb
->s_dirt
= 1;
1474 btrfs_update_inode_block_group(trans
, inode
);
1475 btrfs_update_inode_block_group(trans
, dir
);
1477 nr
= trans
->blocks_used
;
1478 btrfs_end_transaction(trans
, root
);
1479 mutex_unlock(&root
->fs_info
->fs_mutex
);
1482 inode_dec_link_count(inode
);
1485 btrfs_btree_balance_dirty(root
, nr
);
1489 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1490 int mode
, struct nameidata
*nd
)
1492 struct btrfs_trans_handle
*trans
;
1493 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1494 struct inode
*inode
;
1500 mutex_lock(&root
->fs_info
->fs_mutex
);
1501 trans
= btrfs_start_transaction(root
, 1);
1502 btrfs_set_trans_block_group(trans
, dir
);
1504 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1510 inode
= btrfs_new_inode(trans
, root
, objectid
,
1511 BTRFS_I(dir
)->block_group
, mode
);
1512 err
= PTR_ERR(inode
);
1516 btrfs_set_trans_block_group(trans
, inode
);
1517 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1521 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1522 inode
->i_fop
= &btrfs_file_operations
;
1523 inode
->i_op
= &btrfs_file_inode_operations
;
1524 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1525 inode
->i_mapping
, GFP_NOFS
);
1526 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
1528 dir
->i_sb
->s_dirt
= 1;
1529 btrfs_update_inode_block_group(trans
, inode
);
1530 btrfs_update_inode_block_group(trans
, dir
);
1532 nr
= trans
->blocks_used
;
1533 btrfs_end_transaction(trans
, root
);
1534 mutex_unlock(&root
->fs_info
->fs_mutex
);
1537 inode_dec_link_count(inode
);
1540 btrfs_btree_balance_dirty(root
, nr
);
1544 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1545 struct dentry
*dentry
)
1547 struct btrfs_trans_handle
*trans
;
1548 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1549 struct inode
*inode
= old_dentry
->d_inode
;
1554 if (inode
->i_nlink
== 0)
1558 mutex_lock(&root
->fs_info
->fs_mutex
);
1559 trans
= btrfs_start_transaction(root
, 1);
1561 btrfs_set_trans_block_group(trans
, dir
);
1562 atomic_inc(&inode
->i_count
);
1563 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1568 dir
->i_sb
->s_dirt
= 1;
1569 btrfs_update_inode_block_group(trans
, dir
);
1570 err
= btrfs_update_inode(trans
, root
, inode
);
1575 nr
= trans
->blocks_used
;
1576 btrfs_end_transaction(trans
, root
);
1577 mutex_unlock(&root
->fs_info
->fs_mutex
);
1580 inode_dec_link_count(inode
);
1583 btrfs_btree_balance_dirty(root
, nr
);
1587 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1589 struct inode
*inode
;
1590 struct btrfs_trans_handle
*trans
;
1591 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1593 int drop_on_err
= 0;
1595 unsigned long nr
= 1;
1597 mutex_lock(&root
->fs_info
->fs_mutex
);
1598 trans
= btrfs_start_transaction(root
, 1);
1599 btrfs_set_trans_block_group(trans
, dir
);
1601 if (IS_ERR(trans
)) {
1602 err
= PTR_ERR(trans
);
1606 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1612 inode
= btrfs_new_inode(trans
, root
, objectid
,
1613 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1614 if (IS_ERR(inode
)) {
1615 err
= PTR_ERR(inode
);
1620 inode
->i_op
= &btrfs_dir_inode_operations
;
1621 inode
->i_fop
= &btrfs_dir_file_operations
;
1622 btrfs_set_trans_block_group(trans
, inode
);
1625 err
= btrfs_update_inode(trans
, root
, inode
);
1629 err
= btrfs_add_link(trans
, dentry
, inode
);
1633 d_instantiate(dentry
, inode
);
1635 dir
->i_sb
->s_dirt
= 1;
1636 btrfs_update_inode_block_group(trans
, inode
);
1637 btrfs_update_inode_block_group(trans
, dir
);
1640 nr
= trans
->blocks_used
;
1641 btrfs_end_transaction(trans
, root
);
1644 mutex_unlock(&root
->fs_info
->fs_mutex
);
1647 btrfs_btree_balance_dirty(root
, nr
);
1651 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1652 size_t page_offset
, u64 start
, u64 end
,
1658 u64 extent_start
= 0;
1660 u64 objectid
= inode
->i_ino
;
1662 int failed_insert
= 0;
1663 struct btrfs_path
*path
;
1664 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1665 struct btrfs_file_extent_item
*item
;
1666 struct extent_buffer
*leaf
;
1667 struct btrfs_key found_key
;
1668 struct extent_map
*em
= NULL
;
1669 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1670 struct btrfs_trans_handle
*trans
= NULL
;
1672 path
= btrfs_alloc_path();
1674 mutex_lock(&root
->fs_info
->fs_mutex
);
1677 em
= lookup_extent_mapping(em_tree
, start
, end
);
1682 em
= alloc_extent_map(GFP_NOFS
);
1687 em
->start
= EXTENT_MAP_HOLE
;
1688 em
->end
= EXTENT_MAP_HOLE
;
1690 em
->bdev
= inode
->i_sb
->s_bdev
;
1691 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
1692 objectid
, start
, trans
!= NULL
);
1699 if (path
->slots
[0] == 0)
1704 leaf
= path
->nodes
[0];
1705 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1706 struct btrfs_file_extent_item
);
1707 /* are we inside the extent that was found? */
1708 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1709 found_type
= btrfs_key_type(&found_key
);
1710 if (found_key
.objectid
!= objectid
||
1711 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1715 found_type
= btrfs_file_extent_type(leaf
, item
);
1716 extent_start
= found_key
.offset
;
1717 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1718 extent_end
= extent_start
+
1719 btrfs_file_extent_num_bytes(leaf
, item
);
1721 if (start
< extent_start
|| start
>= extent_end
) {
1723 if (start
< extent_start
) {
1724 if (end
< extent_start
)
1726 em
->end
= extent_end
- 1;
1732 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
1734 em
->start
= extent_start
;
1735 em
->end
= extent_end
- 1;
1736 em
->block_start
= EXTENT_MAP_HOLE
;
1737 em
->block_end
= EXTENT_MAP_HOLE
;
1740 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
1741 em
->block_start
= bytenr
;
1742 em
->block_end
= em
->block_start
+
1743 btrfs_file_extent_num_bytes(leaf
, item
) - 1;
1744 em
->start
= extent_start
;
1745 em
->end
= extent_end
- 1;
1747 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1751 size_t extent_offset
;
1754 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
1756 extent_end
= (extent_start
+ size
- 1) |
1757 ((u64
)root
->sectorsize
- 1);
1758 if (start
< extent_start
|| start
>= extent_end
) {
1760 if (start
< extent_start
) {
1761 if (end
< extent_start
)
1763 em
->end
= extent_end
;
1769 em
->block_start
= EXTENT_MAP_INLINE
;
1770 em
->block_end
= EXTENT_MAP_INLINE
;
1773 em
->start
= extent_start
;
1774 em
->end
= extent_start
+ size
- 1;
1778 extent_offset
= ((u64
)page
->index
<< PAGE_CACHE_SHIFT
) -
1779 extent_start
+ page_offset
;
1780 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- page_offset
,
1781 size
- extent_offset
);
1782 em
->start
= extent_start
+ extent_offset
;
1783 em
->end
= (em
->start
+ copy_size
-1) |
1784 ((u64
)root
->sectorsize
-1);
1786 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
1787 if (create
== 0 && !PageUptodate(page
)) {
1788 read_extent_buffer(leaf
, map
+ page_offset
, ptr
,
1790 flush_dcache_page(page
);
1791 } else if (create
&& PageUptodate(page
)) {
1794 free_extent_map(em
);
1796 btrfs_release_path(root
, path
);
1797 trans
= btrfs_start_transaction(root
, 1);
1800 write_extent_buffer(leaf
, map
+ page_offset
, ptr
,
1802 btrfs_mark_buffer_dirty(leaf
);
1805 set_extent_uptodate(em_tree
, em
->start
, em
->end
, GFP_NOFS
);
1808 printk("unkknown found_type %d\n", found_type
);
1815 em
->block_start
= EXTENT_MAP_HOLE
;
1816 em
->block_end
= EXTENT_MAP_HOLE
;
1818 btrfs_release_path(root
, path
);
1819 if (em
->start
> start
|| em
->end
< start
) {
1820 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->end
, start
, end
);
1824 ret
= add_extent_mapping(em_tree
, em
);
1825 if (ret
== -EEXIST
) {
1826 free_extent_map(em
);
1829 if (failed_insert
> 5) {
1830 printk("failing to insert %Lu %Lu\n", start
, end
);
1838 btrfs_free_path(path
);
1840 ret
= btrfs_end_transaction(trans
, root
);
1844 mutex_unlock(&root
->fs_info
->fs_mutex
);
1846 free_extent_map(em
);
1848 return ERR_PTR(err
);
1853 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
1855 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
1858 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1859 unsigned from
, unsigned to
)
1861 return extent_prepare_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1862 page
->mapping
->host
, page
, from
, to
,
1866 int btrfs_readpage(struct file
*file
, struct page
*page
)
1868 struct extent_map_tree
*tree
;
1869 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1870 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
1872 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1874 struct extent_map_tree
*tree
;
1877 if (current
->flags
& PF_MEMALLOC
) {
1878 redirty_page_for_writepage(wbc
, page
);
1882 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1883 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
1886 static int btrfs_writepages(struct address_space
*mapping
,
1887 struct writeback_control
*wbc
)
1889 struct extent_map_tree
*tree
;
1890 tree
= &BTRFS_I(mapping
->host
)->extent_tree
;
1891 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
1895 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
1896 struct list_head
*pages
, unsigned nr_pages
)
1898 struct extent_map_tree
*tree
;
1899 tree
= &BTRFS_I(mapping
->host
)->extent_tree
;
1900 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
1904 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
1906 struct extent_map_tree
*tree
;
1909 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1910 ret
= try_release_extent_mapping(tree
, page
);
1912 ClearPagePrivate(page
);
1913 set_page_private(page
, 0);
1914 page_cache_release(page
);
1919 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
1921 struct extent_map_tree
*tree
;
1923 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1924 extent_invalidatepage(tree
, page
, offset
);
1925 btrfs_releasepage(page
, GFP_NOFS
);
1929 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1930 * called from a page fault handler when a page is first dirtied. Hence we must
1931 * be careful to check for EOF conditions here. We set the page up correctly
1932 * for a written page which means we get ENOSPC checking when writing into
1933 * holes and correct delalloc and unwritten extent mapping on filesystems that
1934 * support these features.
1936 * We are not allowed to take the i_mutex here so we have to play games to
1937 * protect against truncate races as the page could now be beyond EOF. Because
1938 * vmtruncate() writes the inode size before removing pages, once we have the
1939 * page lock we can determine safely if the page is beyond EOF. If it is not
1940 * beyond EOF, then the page is guaranteed safe against truncation until we
1943 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
1945 struct inode
*inode
= vma
->vm_file
->f_path
.dentry
->d_inode
;
1951 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
1953 wait_on_page_writeback(page
);
1954 size
= i_size_read(inode
);
1955 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
1957 if ((page
->mapping
!= inode
->i_mapping
) ||
1958 (page_start
> size
)) {
1959 /* page got truncated out from underneath us */
1963 /* page is wholly or partially inside EOF */
1964 if (page_start
+ PAGE_CACHE_SIZE
> size
)
1965 end
= size
& ~PAGE_CACHE_MASK
;
1967 end
= PAGE_CACHE_SIZE
;
1969 ret
= btrfs_cow_one_page(inode
, page
, end
);
1972 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
1977 static void btrfs_truncate(struct inode
*inode
)
1979 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1981 struct btrfs_trans_handle
*trans
;
1984 if (!S_ISREG(inode
->i_mode
))
1986 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
1989 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1991 mutex_lock(&root
->fs_info
->fs_mutex
);
1992 trans
= btrfs_start_transaction(root
, 1);
1993 btrfs_set_trans_block_group(trans
, inode
);
1995 /* FIXME, add redo link to tree so we don't leak on crash */
1996 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
1997 btrfs_update_inode(trans
, root
, inode
);
1998 nr
= trans
->blocks_used
;
2000 ret
= btrfs_end_transaction(trans
, root
);
2002 mutex_unlock(&root
->fs_info
->fs_mutex
);
2003 btrfs_btree_balance_dirty(root
, nr
);
2006 int btrfs_commit_write(struct file
*file
, struct page
*page
,
2007 unsigned from
, unsigned to
)
2009 loff_t pos
= ((loff_t
)page
->index
<< PAGE_CACHE_SHIFT
) + to
;
2010 struct inode
*inode
= page
->mapping
->host
;
2012 btrfs_cow_one_page(inode
, page
, PAGE_CACHE_SIZE
);
2014 if (pos
> inode
->i_size
) {
2015 i_size_write(inode
, pos
);
2016 mark_inode_dirty(inode
);
2021 static int create_subvol(struct btrfs_root
*root
, char *name
, int namelen
)
2023 struct btrfs_trans_handle
*trans
;
2024 struct btrfs_key key
;
2025 struct btrfs_root_item root_item
;
2026 struct btrfs_inode_item
*inode_item
;
2027 struct extent_buffer
*leaf
;
2028 struct btrfs_root
*new_root
;
2029 struct inode
*inode
;
2034 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
2035 unsigned long nr
= 1;
2037 mutex_lock(&root
->fs_info
->fs_mutex
);
2038 trans
= btrfs_start_transaction(root
, 1);
2041 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
2046 leaf
= __btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
2047 objectid
, trans
->transid
, 0, 0,
2050 return PTR_ERR(leaf
);
2052 btrfs_set_header_nritems(leaf
, 0);
2053 btrfs_set_header_level(leaf
, 0);
2054 btrfs_set_header_bytenr(leaf
, leaf
->start
);
2055 btrfs_set_header_generation(leaf
, trans
->transid
);
2056 btrfs_set_header_owner(leaf
, objectid
);
2058 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
2059 (unsigned long)btrfs_header_fsid(leaf
),
2061 btrfs_mark_buffer_dirty(leaf
);
2063 inode_item
= &root_item
.inode
;
2064 memset(inode_item
, 0, sizeof(*inode_item
));
2065 inode_item
->generation
= cpu_to_le64(1);
2066 inode_item
->size
= cpu_to_le64(3);
2067 inode_item
->nlink
= cpu_to_le32(1);
2068 inode_item
->nblocks
= cpu_to_le64(1);
2069 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
2071 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
2072 btrfs_set_root_level(&root_item
, 0);
2073 btrfs_set_root_refs(&root_item
, 1);
2074 btrfs_set_root_used(&root_item
, 0);
2076 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
2077 root_item
.drop_level
= 0;
2079 free_extent_buffer(leaf
);
2082 btrfs_set_root_dirid(&root_item
, new_dirid
);
2084 key
.objectid
= objectid
;
2086 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
2087 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
2093 * insert the directory item
2095 key
.offset
= (u64
)-1;
2096 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
2097 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2098 name
, namelen
, dir
->i_ino
, &key
,
2103 ret
= btrfs_insert_inode_ref(trans
, root
->fs_info
->tree_root
,
2104 name
, namelen
, objectid
,
2105 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
);
2109 ret
= btrfs_commit_transaction(trans
, root
);
2113 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
2116 trans
= btrfs_start_transaction(new_root
, 1);
2119 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
2120 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
2123 inode
->i_op
= &btrfs_dir_inode_operations
;
2124 inode
->i_fop
= &btrfs_dir_file_operations
;
2125 new_root
->inode
= inode
;
2127 ret
= btrfs_insert_inode_ref(trans
, new_root
, "..", 2, new_dirid
,
2131 ret
= btrfs_update_inode(trans
, new_root
, inode
);
2135 nr
= trans
->blocks_used
;
2136 err
= btrfs_commit_transaction(trans
, root
);
2140 mutex_unlock(&root
->fs_info
->fs_mutex
);
2141 btrfs_btree_balance_dirty(root
, nr
);
2145 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
2147 struct btrfs_trans_handle
*trans
;
2148 struct btrfs_key key
;
2149 struct btrfs_root_item new_root_item
;
2150 struct extent_buffer
*tmp
;
2156 if (!root
->ref_cows
)
2159 down_write(&root
->snap_sem
);
2160 freeze_bdev(root
->fs_info
->sb
->s_bdev
);
2161 thaw_bdev(root
->fs_info
->sb
->s_bdev
, root
->fs_info
->sb
);
2163 mutex_lock(&root
->fs_info
->fs_mutex
);
2164 trans
= btrfs_start_transaction(root
, 1);
2167 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
2171 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
2176 memcpy(&new_root_item
, &root
->root_item
,
2177 sizeof(new_root_item
));
2179 key
.objectid
= objectid
;
2181 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
2183 extent_buffer_get(root
->node
);
2184 btrfs_cow_block(trans
, root
, root
->node
, NULL
, 0, &tmp
);
2185 free_extent_buffer(tmp
);
2187 btrfs_copy_root(trans
, root
, root
->node
, &tmp
, objectid
);
2189 btrfs_set_root_bytenr(&new_root_item
, tmp
->start
);
2190 btrfs_set_root_level(&new_root_item
, btrfs_header_level(tmp
));
2191 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
2193 free_extent_buffer(tmp
);
2198 * insert the directory item
2200 key
.offset
= (u64
)-1;
2201 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2203 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2204 &key
, BTRFS_FT_DIR
);
2209 ret
= btrfs_insert_inode_ref(trans
, root
->fs_info
->tree_root
,
2210 name
, namelen
, objectid
,
2211 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
);
2216 nr
= trans
->blocks_used
;
2217 err
= btrfs_commit_transaction(trans
, root
);
2222 mutex_unlock(&root
->fs_info
->fs_mutex
);
2223 up_write(&root
->snap_sem
);
2224 btrfs_btree_balance_dirty(root
, nr
);
2228 static unsigned long force_ra(struct address_space
*mapping
,
2229 struct file_ra_state
*ra
, struct file
*file
,
2230 pgoff_t offset
, pgoff_t last_index
)
2234 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2235 req_size
= last_index
- offset
+ 1;
2236 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2239 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2240 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2241 return offset
+ req_size
;
2245 int btrfs_defrag_file(struct file
*file
) {
2246 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2247 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
2249 unsigned long last_index
;
2250 unsigned long ra_index
= 0;
2255 mutex_lock(&inode
->i_mutex
);
2256 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2257 for (i
= 0; i
<= last_index
; i
++) {
2258 if (i
== ra_index
) {
2259 ra_index
= force_ra(inode
->i_mapping
, &file
->f_ra
,
2260 file
, ra_index
, last_index
);
2262 page
= grab_cache_page(inode
->i_mapping
, i
);
2265 if (!PageUptodate(page
)) {
2266 btrfs_readpage(NULL
, page
);
2268 if (!PageUptodate(page
)) {
2270 page_cache_release(page
);
2274 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2275 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2277 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2278 set_extent_delalloc(em_tree
, page_start
,
2279 page_end
, GFP_NOFS
);
2280 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2281 set_page_dirty(page
);
2283 page_cache_release(page
);
2284 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2288 mutex_unlock(&inode
->i_mutex
);
2292 static int btrfs_ioctl_snap_create(struct btrfs_root
*root
, void __user
*arg
)
2294 struct btrfs_ioctl_vol_args vol_args
;
2295 struct btrfs_dir_item
*di
;
2296 struct btrfs_path
*path
;
2300 if (copy_from_user(&vol_args
, arg
, sizeof(vol_args
)))
2303 namelen
= strlen(vol_args
.name
);
2304 if (namelen
> BTRFS_VOL_NAME_MAX
)
2306 if (strchr(vol_args
.name
, '/'))
2309 path
= btrfs_alloc_path();
2313 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2314 mutex_lock(&root
->fs_info
->fs_mutex
);
2315 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2317 vol_args
.name
, namelen
, 0);
2318 mutex_unlock(&root
->fs_info
->fs_mutex
);
2319 btrfs_free_path(path
);
2320 if (di
&& !IS_ERR(di
))
2325 if (root
== root
->fs_info
->tree_root
)
2326 return create_subvol(root
, vol_args
.name
, namelen
);
2327 return create_snapshot(root
, vol_args
.name
, namelen
);
2330 static int btrfs_ioctl_defrag(struct file
*file
)
2332 struct inode
*inode
= file
->f_path
.dentry
->d_inode
;
2333 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2335 switch (inode
->i_mode
& S_IFMT
) {
2337 mutex_lock(&root
->fs_info
->fs_mutex
);
2338 btrfs_defrag_root(root
, 0);
2339 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2340 mutex_unlock(&root
->fs_info
->fs_mutex
);
2343 btrfs_defrag_file(file
);
2350 long btrfs_ioctl(struct file
*file
, unsigned int
2351 cmd
, unsigned long arg
)
2353 struct btrfs_root
*root
= BTRFS_I(file
->f_path
.dentry
->d_inode
)->root
;
2356 case BTRFS_IOC_SNAP_CREATE
:
2357 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2358 case BTRFS_IOC_DEFRAG
:
2359 return btrfs_ioctl_defrag(file
);
2366 * Called inside transaction, so use GFP_NOFS
2368 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2370 struct btrfs_inode
*ei
;
2372 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2376 return &ei
->vfs_inode
;
2379 void btrfs_destroy_inode(struct inode
*inode
)
2381 WARN_ON(!list_empty(&inode
->i_dentry
));
2382 WARN_ON(inode
->i_data
.nrpages
);
2384 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2387 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2388 static void init_once(struct kmem_cache
* cachep
, void *foo
)
2390 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2391 unsigned long flags
)
2394 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2396 inode_init_once(&ei
->vfs_inode
);
2399 void btrfs_destroy_cachep(void)
2401 if (btrfs_inode_cachep
)
2402 kmem_cache_destroy(btrfs_inode_cachep
);
2403 if (btrfs_trans_handle_cachep
)
2404 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2405 if (btrfs_transaction_cachep
)
2406 kmem_cache_destroy(btrfs_transaction_cachep
);
2407 if (btrfs_bit_radix_cachep
)
2408 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2409 if (btrfs_path_cachep
)
2410 kmem_cache_destroy(btrfs_path_cachep
);
2413 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2414 unsigned long extra_flags
,
2415 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2416 void (*ctor
)(struct kmem_cache
*, void *)
2418 void (*ctor
)(void *, struct kmem_cache
*,
2423 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2424 SLAB_MEM_SPREAD
| extra_flags
), ctor
2425 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2431 int btrfs_init_cachep(void)
2433 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2434 sizeof(struct btrfs_inode
),
2436 if (!btrfs_inode_cachep
)
2438 btrfs_trans_handle_cachep
=
2439 btrfs_cache_create("btrfs_trans_handle_cache",
2440 sizeof(struct btrfs_trans_handle
),
2442 if (!btrfs_trans_handle_cachep
)
2444 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2445 sizeof(struct btrfs_transaction
),
2447 if (!btrfs_transaction_cachep
)
2449 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2450 sizeof(struct btrfs_path
),
2452 if (!btrfs_path_cachep
)
2454 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2455 SLAB_DESTROY_BY_RCU
, NULL
);
2456 if (!btrfs_bit_radix_cachep
)
2460 btrfs_destroy_cachep();
2464 static int btrfs_getattr(struct vfsmount
*mnt
,
2465 struct dentry
*dentry
, struct kstat
*stat
)
2467 struct inode
*inode
= dentry
->d_inode
;
2468 generic_fillattr(inode
, stat
);
2469 stat
->blksize
= 256 * 1024;
2473 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2474 struct inode
* new_dir
,struct dentry
*new_dentry
)
2476 struct btrfs_trans_handle
*trans
;
2477 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2478 struct inode
*new_inode
= new_dentry
->d_inode
;
2479 struct inode
*old_inode
= old_dentry
->d_inode
;
2480 struct timespec ctime
= CURRENT_TIME
;
2481 struct btrfs_path
*path
;
2484 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2485 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2489 mutex_lock(&root
->fs_info
->fs_mutex
);
2490 trans
= btrfs_start_transaction(root
, 1);
2492 btrfs_set_trans_block_group(trans
, new_dir
);
2493 path
= btrfs_alloc_path();
2499 old_dentry
->d_inode
->i_nlink
++;
2500 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2501 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2502 old_inode
->i_ctime
= ctime
;
2504 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2509 new_inode
->i_ctime
= CURRENT_TIME
;
2510 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2514 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2519 btrfs_free_path(path
);
2520 btrfs_end_transaction(trans
, root
);
2521 mutex_unlock(&root
->fs_info
->fs_mutex
);
2525 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2526 const char *symname
)
2528 struct btrfs_trans_handle
*trans
;
2529 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2530 struct btrfs_path
*path
;
2531 struct btrfs_key key
;
2532 struct inode
*inode
;
2539 struct btrfs_file_extent_item
*ei
;
2540 struct extent_buffer
*leaf
;
2543 name_len
= strlen(symname
) + 1;
2544 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2545 return -ENAMETOOLONG
;
2546 mutex_lock(&root
->fs_info
->fs_mutex
);
2547 trans
= btrfs_start_transaction(root
, 1);
2548 btrfs_set_trans_block_group(trans
, dir
);
2550 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2556 inode
= btrfs_new_inode(trans
, root
, objectid
,
2557 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2558 err
= PTR_ERR(inode
);
2562 btrfs_set_trans_block_group(trans
, inode
);
2563 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2567 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2568 inode
->i_fop
= &btrfs_file_operations
;
2569 inode
->i_op
= &btrfs_file_inode_operations
;
2570 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
2571 inode
->i_mapping
, GFP_NOFS
);
2572 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
2574 dir
->i_sb
->s_dirt
= 1;
2575 btrfs_update_inode_block_group(trans
, inode
);
2576 btrfs_update_inode_block_group(trans
, dir
);
2580 path
= btrfs_alloc_path();
2582 key
.objectid
= inode
->i_ino
;
2584 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2585 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2586 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2592 leaf
= path
->nodes
[0];
2593 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2594 struct btrfs_file_extent_item
);
2595 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2596 btrfs_set_file_extent_type(leaf
, ei
,
2597 BTRFS_FILE_EXTENT_INLINE
);
2598 ptr
= btrfs_file_extent_inline_start(ei
);
2599 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
2600 btrfs_mark_buffer_dirty(leaf
);
2601 btrfs_free_path(path
);
2603 inode
->i_op
= &btrfs_symlink_inode_operations
;
2604 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2605 inode
->i_size
= name_len
- 1;
2606 err
= btrfs_update_inode(trans
, root
, inode
);
2611 nr
= trans
->blocks_used
;
2612 btrfs_end_transaction(trans
, root
);
2613 mutex_unlock(&root
->fs_info
->fs_mutex
);
2615 inode_dec_link_count(inode
);
2618 btrfs_btree_balance_dirty(root
, nr
);
2622 static struct inode_operations btrfs_dir_inode_operations
= {
2623 .lookup
= btrfs_lookup
,
2624 .create
= btrfs_create
,
2625 .unlink
= btrfs_unlink
,
2627 .mkdir
= btrfs_mkdir
,
2628 .rmdir
= btrfs_rmdir
,
2629 .rename
= btrfs_rename
,
2630 .symlink
= btrfs_symlink
,
2631 .setattr
= btrfs_setattr
,
2632 .mknod
= btrfs_mknod
,
2633 .setxattr
= generic_setxattr
,
2634 .getxattr
= generic_getxattr
,
2635 .listxattr
= btrfs_listxattr
,
2636 .removexattr
= generic_removexattr
,
2639 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2640 .lookup
= btrfs_lookup
,
2643 static struct file_operations btrfs_dir_file_operations
= {
2644 .llseek
= generic_file_llseek
,
2645 .read
= generic_read_dir
,
2646 .readdir
= btrfs_readdir
,
2647 .unlocked_ioctl
= btrfs_ioctl
,
2648 #ifdef CONFIG_COMPAT
2649 .compat_ioctl
= btrfs_ioctl
,
2653 static struct extent_map_ops btrfs_extent_map_ops
= {
2654 .fill_delalloc
= run_delalloc_range
,
2655 .writepage_io_hook
= btrfs_writepage_io_hook
,
2656 .readpage_io_hook
= btrfs_readpage_io_hook
,
2657 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2660 static struct address_space_operations btrfs_aops
= {
2661 .readpage
= btrfs_readpage
,
2662 .writepage
= btrfs_writepage
,
2663 .writepages
= btrfs_writepages
,
2664 .readpages
= btrfs_readpages
,
2665 .sync_page
= block_sync_page
,
2666 .prepare_write
= btrfs_prepare_write
,
2667 .commit_write
= btrfs_commit_write
,
2669 .invalidatepage
= btrfs_invalidatepage
,
2670 .releasepage
= btrfs_releasepage
,
2671 .set_page_dirty
= __set_page_dirty_nobuffers
,
2674 static struct address_space_operations btrfs_symlink_aops
= {
2675 .readpage
= btrfs_readpage
,
2676 .writepage
= btrfs_writepage
,
2677 .invalidatepage
= btrfs_invalidatepage
,
2678 .releasepage
= btrfs_releasepage
,
2681 static struct inode_operations btrfs_file_inode_operations
= {
2682 .truncate
= btrfs_truncate
,
2683 .getattr
= btrfs_getattr
,
2684 .setattr
= btrfs_setattr
,
2685 .setxattr
= generic_setxattr
,
2686 .getxattr
= generic_getxattr
,
2687 .listxattr
= btrfs_listxattr
,
2688 .removexattr
= generic_removexattr
,
2691 static struct inode_operations btrfs_special_inode_operations
= {
2692 .getattr
= btrfs_getattr
,
2693 .setattr
= btrfs_setattr
,
2696 static struct inode_operations btrfs_symlink_inode_operations
= {
2697 .readlink
= generic_readlink
,
2698 .follow_link
= page_follow_link_light
,
2699 .put_link
= page_put_link
,