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 if (btrfs_count_snapshots_in_path(root
, path
, bytenr
) != 1) {
185 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
190 btrfs_free_path(path
);
193 btrfs_release_path(root
, path
);
197 cow_file_range(inode
, start
, cow_end
);
202 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
204 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
207 mutex_lock(&root
->fs_info
->fs_mutex
);
208 if (btrfs_test_opt(root
, NODATACOW
))
209 ret
= run_delalloc_nocow(inode
, start
, end
);
211 ret
= cow_file_range(inode
, start
, end
);
212 mutex_unlock(&root
->fs_info
->fs_mutex
);
216 int btrfs_writepage_io_hook(struct page
*page
, u64 start
, u64 end
)
218 struct inode
*inode
= page
->mapping
->host
;
219 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
220 struct btrfs_trans_handle
*trans
;
223 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
224 size_t offset
= start
- page_start
;
226 if (btrfs_test_opt(root
, NODATASUM
))
229 mutex_lock(&root
->fs_info
->fs_mutex
);
230 trans
= btrfs_start_transaction(root
, 1);
231 btrfs_set_trans_block_group(trans
, inode
);
233 btrfs_csum_file_block(trans
, root
, inode
, inode
->i_ino
,
234 start
, kaddr
+ offset
, end
- start
+ 1);
236 ret
= btrfs_end_transaction(trans
, root
);
238 mutex_unlock(&root
->fs_info
->fs_mutex
);
242 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
245 struct inode
*inode
= page
->mapping
->host
;
246 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
247 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
248 struct btrfs_csum_item
*item
;
249 struct btrfs_path
*path
= NULL
;
252 if (btrfs_test_opt(root
, NODATASUM
))
255 mutex_lock(&root
->fs_info
->fs_mutex
);
256 path
= btrfs_alloc_path();
257 item
= btrfs_lookup_csum(NULL
, root
, path
, inode
->i_ino
, start
, 0);
260 /* a csum that isn't present is a preallocated region. */
261 if (ret
== -ENOENT
|| ret
== -EFBIG
)
266 read_extent_buffer(path
->nodes
[0], &csum
, (unsigned long)item
,
268 set_state_private(em_tree
, start
, csum
);
271 btrfs_free_path(path
);
272 mutex_unlock(&root
->fs_info
->fs_mutex
);
276 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
)
278 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
279 struct inode
*inode
= page
->mapping
->host
;
280 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
284 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
288 if (btrfs_test_opt(root
, NODATASUM
))
291 ret
= get_state_private(em_tree
, start
, &private);
292 local_irq_save(flags
);
293 kaddr
= kmap_atomic(page
, KM_IRQ0
);
297 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
298 btrfs_csum_final(csum
, (char *)&csum
);
299 if (csum
!= private) {
302 kunmap_atomic(kaddr
, KM_IRQ0
);
303 local_irq_restore(flags
);
307 printk("btrfs csum failed ino %lu off %llu\n",
308 page
->mapping
->host
->i_ino
, (unsigned long long)start
);
309 memset(kaddr
+ offset
, 1, end
- start
+ 1);
310 flush_dcache_page(page
);
311 kunmap_atomic(kaddr
, KM_IRQ0
);
312 local_irq_restore(flags
);
316 void btrfs_read_locked_inode(struct inode
*inode
)
318 struct btrfs_path
*path
;
319 struct extent_buffer
*leaf
;
320 struct btrfs_inode_item
*inode_item
;
321 struct btrfs_inode_timespec
*tspec
;
322 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
323 struct btrfs_key location
;
324 u64 alloc_group_block
;
328 path
= btrfs_alloc_path();
330 mutex_lock(&root
->fs_info
->fs_mutex
);
332 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
333 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
337 leaf
= path
->nodes
[0];
338 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
339 struct btrfs_inode_item
);
341 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
342 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
343 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
344 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
345 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
347 tspec
= btrfs_inode_atime(inode_item
);
348 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
349 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
351 tspec
= btrfs_inode_mtime(inode_item
);
352 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
353 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
355 tspec
= btrfs_inode_ctime(inode_item
);
356 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
357 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
359 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
360 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
362 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
364 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
365 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
368 btrfs_free_path(path
);
371 mutex_unlock(&root
->fs_info
->fs_mutex
);
373 switch (inode
->i_mode
& S_IFMT
) {
375 inode
->i_mapping
->a_ops
= &btrfs_aops
;
376 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
377 inode
->i_fop
= &btrfs_file_operations
;
378 inode
->i_op
= &btrfs_file_inode_operations
;
381 inode
->i_fop
= &btrfs_dir_file_operations
;
382 if (root
== root
->fs_info
->tree_root
)
383 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
385 inode
->i_op
= &btrfs_dir_inode_operations
;
388 inode
->i_op
= &btrfs_symlink_inode_operations
;
389 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
392 init_special_inode(inode
, inode
->i_mode
, rdev
);
398 btrfs_release_path(root
, path
);
399 btrfs_free_path(path
);
400 mutex_unlock(&root
->fs_info
->fs_mutex
);
401 make_bad_inode(inode
);
404 static void fill_inode_item(struct extent_buffer
*leaf
,
405 struct btrfs_inode_item
*item
,
408 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
409 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
410 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
411 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
412 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
414 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
415 inode
->i_atime
.tv_sec
);
416 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
417 inode
->i_atime
.tv_nsec
);
419 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
420 inode
->i_mtime
.tv_sec
);
421 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
422 inode
->i_mtime
.tv_nsec
);
424 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
425 inode
->i_ctime
.tv_sec
);
426 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
427 inode
->i_ctime
.tv_nsec
);
429 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
430 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
431 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
432 btrfs_set_inode_block_group(leaf
, item
,
433 BTRFS_I(inode
)->block_group
->key
.objectid
);
436 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
437 struct btrfs_root
*root
,
440 struct btrfs_inode_item
*inode_item
;
441 struct btrfs_path
*path
;
442 struct extent_buffer
*leaf
;
445 path
= btrfs_alloc_path();
447 ret
= btrfs_lookup_inode(trans
, root
, path
,
448 &BTRFS_I(inode
)->location
, 1);
455 leaf
= path
->nodes
[0];
456 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
457 struct btrfs_inode_item
);
459 fill_inode_item(leaf
, inode_item
, inode
);
460 btrfs_mark_buffer_dirty(leaf
);
461 btrfs_set_inode_last_trans(trans
, inode
);
464 btrfs_release_path(root
, path
);
465 btrfs_free_path(path
);
470 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
471 struct btrfs_root
*root
,
473 struct dentry
*dentry
)
475 struct btrfs_path
*path
;
476 const char *name
= dentry
->d_name
.name
;
477 int name_len
= dentry
->d_name
.len
;
479 struct extent_buffer
*leaf
;
480 struct btrfs_dir_item
*di
;
481 struct btrfs_key key
;
483 path
= btrfs_alloc_path();
489 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
499 leaf
= path
->nodes
[0];
500 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
501 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
504 btrfs_release_path(root
, path
);
506 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
507 key
.objectid
, name
, name_len
, -1);
516 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
518 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
519 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
520 dentry
->d_inode
->i_ino
,
521 dentry
->d_parent
->d_inode
->i_ino
);
523 printk("failed to delete reference to %.*s, "
524 "inode %lu parent %lu\n", name_len
, name
,
525 dentry
->d_inode
->i_ino
,
526 dentry
->d_parent
->d_inode
->i_ino
);
529 btrfs_free_path(path
);
531 dir
->i_size
-= name_len
* 2;
532 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
533 btrfs_update_inode(trans
, root
, dir
);
534 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
535 dentry
->d_inode
->i_nlink
--;
537 drop_nlink(dentry
->d_inode
);
539 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
540 dir
->i_sb
->s_dirt
= 1;
545 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
547 struct btrfs_root
*root
;
548 struct btrfs_trans_handle
*trans
;
552 root
= BTRFS_I(dir
)->root
;
553 mutex_lock(&root
->fs_info
->fs_mutex
);
554 trans
= btrfs_start_transaction(root
, 1);
556 btrfs_set_trans_block_group(trans
, dir
);
557 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
558 nr
= trans
->blocks_used
;
560 btrfs_end_transaction(trans
, root
);
561 mutex_unlock(&root
->fs_info
->fs_mutex
);
562 btrfs_btree_balance_dirty(root
, nr
);
567 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
569 struct inode
*inode
= dentry
->d_inode
;
572 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
573 struct btrfs_trans_handle
*trans
;
576 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
579 mutex_lock(&root
->fs_info
->fs_mutex
);
580 trans
= btrfs_start_transaction(root
, 1);
581 btrfs_set_trans_block_group(trans
, dir
);
583 /* now the directory is empty */
584 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
589 nr
= trans
->blocks_used
;
590 ret
= btrfs_end_transaction(trans
, root
);
591 mutex_unlock(&root
->fs_info
->fs_mutex
);
592 btrfs_btree_balance_dirty(root
, nr
);
599 static int btrfs_free_inode(struct btrfs_trans_handle
*trans
,
600 struct btrfs_root
*root
,
603 struct btrfs_path
*path
;
608 path
= btrfs_alloc_path();
610 ret
= btrfs_lookup_inode(trans
, root
, path
,
611 &BTRFS_I(inode
)->location
, -1);
615 ret
= btrfs_del_item(trans
, root
, path
);
616 btrfs_free_path(path
);
621 * this can truncate away extent items, csum items and directory items.
622 * It starts at a high offset and removes keys until it can't find
623 * any higher than i_size.
625 * csum items that cross the new i_size are truncated to the new size
628 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
629 struct btrfs_root
*root
,
633 struct btrfs_path
*path
;
634 struct btrfs_key key
;
635 struct btrfs_key found_key
;
637 struct extent_buffer
*leaf
;
638 struct btrfs_file_extent_item
*fi
;
639 u64 extent_start
= 0;
640 u64 extent_num_bytes
= 0;
646 int extent_type
= -1;
648 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
649 path
= btrfs_alloc_path();
653 /* FIXME, add redo link to tree so we don't leak on crash */
654 key
.objectid
= inode
->i_ino
;
655 key
.offset
= (u64
)-1;
659 btrfs_init_path(path
);
661 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
666 BUG_ON(path
->slots
[0] == 0);
669 leaf
= path
->nodes
[0];
670 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
671 found_type
= btrfs_key_type(&found_key
);
673 if (found_key
.objectid
!= inode
->i_ino
)
676 if (found_type
!= BTRFS_CSUM_ITEM_KEY
&&
677 found_type
!= BTRFS_DIR_ITEM_KEY
&&
678 found_type
!= BTRFS_DIR_INDEX_KEY
&&
679 found_type
!= BTRFS_EXTENT_DATA_KEY
)
682 item_end
= found_key
.offset
;
683 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
684 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
685 struct btrfs_file_extent_item
);
686 extent_type
= btrfs_file_extent_type(leaf
, fi
);
687 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
689 btrfs_file_extent_num_bytes(leaf
, fi
);
690 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
691 struct btrfs_item
*item
= btrfs_item_nr(leaf
,
693 item_end
+= btrfs_file_extent_inline_len(leaf
,
698 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
699 ret
= btrfs_csum_truncate(trans
, root
, path
,
703 if (item_end
< inode
->i_size
) {
704 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
705 found_type
= BTRFS_INODE_ITEM_KEY
;
706 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
707 found_type
= BTRFS_CSUM_ITEM_KEY
;
708 } else if (found_type
) {
713 btrfs_set_key_type(&key
, found_type
);
714 btrfs_release_path(root
, path
);
717 if (found_key
.offset
>= inode
->i_size
)
723 /* FIXME, shrink the extent if the ref count is only 1 */
724 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
727 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
729 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
732 btrfs_file_extent_num_bytes(leaf
, fi
);
733 extent_num_bytes
= inode
->i_size
-
734 found_key
.offset
+ root
->sectorsize
- 1;
735 btrfs_set_file_extent_num_bytes(leaf
, fi
,
737 num_dec
= (orig_num_bytes
-
738 extent_num_bytes
) >> 9;
739 if (extent_start
!= 0) {
740 inode
->i_blocks
-= num_dec
;
742 btrfs_mark_buffer_dirty(leaf
);
745 btrfs_file_extent_disk_num_bytes(leaf
,
747 /* FIXME blocksize != 4096 */
748 num_dec
= btrfs_file_extent_num_bytes(leaf
,
750 if (extent_start
!= 0) {
752 inode
->i_blocks
-= num_dec
;
754 root_gen
= btrfs_header_generation(leaf
);
755 root_owner
= btrfs_header_owner(leaf
);
757 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
&&
759 u32 newsize
= inode
->i_size
- found_key
.offset
;
760 newsize
= btrfs_file_extent_calc_inline_size(newsize
);
761 ret
= btrfs_truncate_item(trans
, root
, path
,
767 ret
= btrfs_del_item(trans
, root
, path
);
773 btrfs_release_path(root
, path
);
775 ret
= btrfs_free_extent(trans
, root
, extent_start
,
778 root_gen
, inode
->i_ino
,
779 found_key
.offset
, 0);
785 btrfs_release_path(root
, path
);
786 btrfs_free_path(path
);
787 inode
->i_sb
->s_dirt
= 1;
791 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
796 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
797 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
798 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
800 WARN_ON(!PageLocked(page
));
801 set_page_extent_mapped(page
);
803 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
804 set_extent_delalloc(&BTRFS_I(inode
)->extent_tree
, page_start
,
806 if (zero_start
!= PAGE_CACHE_SIZE
) {
808 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
809 flush_dcache_page(page
);
812 set_page_dirty(page
);
813 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
819 * taken from block_truncate_page, but does cow as it zeros out
820 * any bytes left in the last page in the file.
822 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
824 struct inode
*inode
= mapping
->host
;
825 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
826 u32 blocksize
= root
->sectorsize
;
827 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
828 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
833 if ((offset
& (blocksize
- 1)) == 0)
836 down_read(&root
->snap_sem
);
838 page
= grab_cache_page(mapping
, index
);
841 if (!PageUptodate(page
)) {
842 ret
= btrfs_readpage(NULL
, page
);
844 if (!PageUptodate(page
)) {
849 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
851 ret
= btrfs_cow_one_page(inode
, page
, offset
);
854 page_cache_release(page
);
855 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
860 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
862 struct inode
*inode
= dentry
->d_inode
;
865 err
= inode_change_ok(inode
, attr
);
869 if (S_ISREG(inode
->i_mode
) &&
870 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
871 struct btrfs_trans_handle
*trans
;
872 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
873 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
875 u64 mask
= root
->sectorsize
- 1;
876 u64 pos
= (inode
->i_size
+ mask
) & ~mask
;
877 u64 block_end
= attr
->ia_size
| mask
;
881 if (attr
->ia_size
<= pos
)
884 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
886 lock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
887 hole_size
= (attr
->ia_size
- pos
+ mask
) & ~mask
;
889 mutex_lock(&root
->fs_info
->fs_mutex
);
890 trans
= btrfs_start_transaction(root
, 1);
891 btrfs_set_trans_block_group(trans
, inode
);
892 err
= btrfs_drop_extents(trans
, root
, inode
,
893 pos
, pos
+ hole_size
, pos
,
896 if (alloc_hint
!= EXTENT_MAP_INLINE
) {
897 err
= btrfs_insert_file_extent(trans
, root
,
899 pos
, 0, 0, hole_size
);
901 btrfs_end_transaction(trans
, root
);
902 mutex_unlock(&root
->fs_info
->fs_mutex
);
903 unlock_extent(em_tree
, pos
, block_end
, GFP_NOFS
);
908 err
= inode_setattr(inode
, attr
);
912 void btrfs_delete_inode(struct inode
*inode
)
914 struct btrfs_trans_handle
*trans
;
915 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
919 truncate_inode_pages(&inode
->i_data
, 0);
920 if (is_bad_inode(inode
)) {
925 mutex_lock(&root
->fs_info
->fs_mutex
);
926 trans
= btrfs_start_transaction(root
, 1);
928 btrfs_set_trans_block_group(trans
, inode
);
929 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
932 ret
= btrfs_delete_xattrs(trans
, root
, inode
);
935 ret
= btrfs_free_inode(trans
, root
, inode
);
938 nr
= trans
->blocks_used
;
940 btrfs_end_transaction(trans
, root
);
941 mutex_unlock(&root
->fs_info
->fs_mutex
);
942 btrfs_btree_balance_dirty(root
, nr
);
946 nr
= trans
->blocks_used
;
947 btrfs_end_transaction(trans
, root
);
948 mutex_unlock(&root
->fs_info
->fs_mutex
);
949 btrfs_btree_balance_dirty(root
, nr
);
955 * this returns the key found in the dir entry in the location pointer.
956 * If no dir entries were found, location->objectid is 0.
958 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
959 struct btrfs_key
*location
)
961 const char *name
= dentry
->d_name
.name
;
962 int namelen
= dentry
->d_name
.len
;
963 struct btrfs_dir_item
*di
;
964 struct btrfs_path
*path
;
965 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
968 if (namelen
== 1 && strcmp(name
, ".") == 0) {
969 location
->objectid
= dir
->i_ino
;
970 location
->type
= BTRFS_INODE_ITEM_KEY
;
971 location
->offset
= 0;
974 path
= btrfs_alloc_path();
977 if (namelen
== 2 && strcmp(name
, "..") == 0) {
978 struct btrfs_key key
;
979 struct extent_buffer
*leaf
;
983 key
.objectid
= dir
->i_ino
;
984 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
986 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
990 leaf
= path
->nodes
[0];
991 slot
= path
->slots
[0];
992 nritems
= btrfs_header_nritems(leaf
);
996 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
997 if (key
.objectid
!= dir
->i_ino
||
998 key
.type
!= BTRFS_INODE_REF_KEY
) {
1001 location
->objectid
= key
.offset
;
1002 location
->type
= BTRFS_INODE_ITEM_KEY
;
1003 location
->offset
= 0;
1007 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
1011 if (!di
|| IS_ERR(di
)) {
1014 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
1016 btrfs_free_path(path
);
1019 location
->objectid
= 0;
1024 * when we hit a tree root in a directory, the btrfs part of the inode
1025 * needs to be changed to reflect the root directory of the tree root. This
1026 * is kind of like crossing a mount point.
1028 static int fixup_tree_root_location(struct btrfs_root
*root
,
1029 struct btrfs_key
*location
,
1030 struct btrfs_root
**sub_root
,
1031 struct dentry
*dentry
)
1033 struct btrfs_path
*path
;
1034 struct btrfs_root_item
*ri
;
1036 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
1038 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1041 path
= btrfs_alloc_path();
1043 mutex_lock(&root
->fs_info
->fs_mutex
);
1045 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
1046 dentry
->d_name
.name
,
1047 dentry
->d_name
.len
);
1048 if (IS_ERR(*sub_root
))
1049 return PTR_ERR(*sub_root
);
1051 ri
= &(*sub_root
)->root_item
;
1052 location
->objectid
= btrfs_root_dirid(ri
);
1053 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1054 location
->offset
= 0;
1056 btrfs_free_path(path
);
1057 mutex_unlock(&root
->fs_info
->fs_mutex
);
1061 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
1063 struct btrfs_iget_args
*args
= p
;
1064 inode
->i_ino
= args
->ino
;
1065 BTRFS_I(inode
)->root
= args
->root
;
1066 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1067 inode
->i_mapping
, GFP_NOFS
);
1071 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
1073 struct btrfs_iget_args
*args
= opaque
;
1074 return (args
->ino
== inode
->i_ino
&&
1075 args
->root
== BTRFS_I(inode
)->root
);
1078 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1079 struct btrfs_root
*root
)
1081 struct inode
*inode
;
1082 struct btrfs_iget_args args
;
1083 args
.ino
= objectid
;
1086 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
1087 btrfs_init_locked_inode
,
1092 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
1093 struct nameidata
*nd
)
1095 struct inode
* inode
;
1096 struct btrfs_inode
*bi
= BTRFS_I(dir
);
1097 struct btrfs_root
*root
= bi
->root
;
1098 struct btrfs_root
*sub_root
= root
;
1099 struct btrfs_key location
;
1102 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
1103 return ERR_PTR(-ENAMETOOLONG
);
1105 mutex_lock(&root
->fs_info
->fs_mutex
);
1106 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
1107 mutex_unlock(&root
->fs_info
->fs_mutex
);
1110 return ERR_PTR(ret
);
1113 if (location
.objectid
) {
1114 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
1117 return ERR_PTR(ret
);
1119 return ERR_PTR(-ENOENT
);
1120 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
1123 return ERR_PTR(-EACCES
);
1124 if (inode
->i_state
& I_NEW
) {
1125 /* the inode and parent dir are two different roots */
1126 if (sub_root
!= root
) {
1128 sub_root
->inode
= inode
;
1130 BTRFS_I(inode
)->root
= sub_root
;
1131 memcpy(&BTRFS_I(inode
)->location
, &location
,
1133 btrfs_read_locked_inode(inode
);
1134 unlock_new_inode(inode
);
1137 return d_splice_alias(inode
, dentry
);
1140 static unsigned char btrfs_filetype_table
[] = {
1141 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1144 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
1146 struct inode
*inode
= filp
->f_dentry
->d_inode
;
1147 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1148 struct btrfs_item
*item
;
1149 struct btrfs_dir_item
*di
;
1150 struct btrfs_key key
;
1151 struct btrfs_key found_key
;
1152 struct btrfs_path
*path
;
1155 struct extent_buffer
*leaf
;
1158 unsigned char d_type
;
1163 int key_type
= BTRFS_DIR_INDEX_KEY
;
1168 /* FIXME, use a real flag for deciding about the key type */
1169 if (root
->fs_info
->tree_root
== root
)
1170 key_type
= BTRFS_DIR_ITEM_KEY
;
1172 /* special case for "." */
1173 if (filp
->f_pos
== 0) {
1174 over
= filldir(dirent
, ".", 1,
1182 mutex_lock(&root
->fs_info
->fs_mutex
);
1183 key
.objectid
= inode
->i_ino
;
1184 path
= btrfs_alloc_path();
1187 /* special case for .., just use the back ref */
1188 if (filp
->f_pos
== 1) {
1189 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1191 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1193 leaf
= path
->nodes
[0];
1194 slot
= path
->slots
[0];
1195 nritems
= btrfs_header_nritems(leaf
);
1196 if (slot
>= nritems
) {
1197 btrfs_release_path(root
, path
);
1198 goto read_dir_items
;
1200 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1201 btrfs_release_path(root
, path
);
1202 if (found_key
.objectid
!= key
.objectid
||
1203 found_key
.type
!= BTRFS_INODE_REF_KEY
)
1204 goto read_dir_items
;
1205 over
= filldir(dirent
, "..", 2,
1206 2, found_key
.offset
, DT_DIR
);
1213 btrfs_set_key_type(&key
, key_type
);
1214 key
.offset
= filp
->f_pos
;
1216 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1221 leaf
= path
->nodes
[0];
1222 nritems
= btrfs_header_nritems(leaf
);
1223 slot
= path
->slots
[0];
1224 if (advance
|| slot
>= nritems
) {
1225 if (slot
>= nritems
-1) {
1226 ret
= btrfs_next_leaf(root
, path
);
1229 leaf
= path
->nodes
[0];
1230 nritems
= btrfs_header_nritems(leaf
);
1231 slot
= path
->slots
[0];
1238 item
= btrfs_item_nr(leaf
, slot
);
1239 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1241 if (found_key
.objectid
!= key
.objectid
)
1243 if (btrfs_key_type(&found_key
) != key_type
)
1245 if (found_key
.offset
< filp
->f_pos
)
1248 filp
->f_pos
= found_key
.offset
;
1250 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1252 di_total
= btrfs_item_size(leaf
, item
);
1253 while(di_cur
< di_total
) {
1254 struct btrfs_key location
;
1256 name_len
= btrfs_dir_name_len(leaf
, di
);
1257 if (name_len
< 32) {
1258 name_ptr
= tmp_name
;
1260 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1263 read_extent_buffer(leaf
, name_ptr
,
1264 (unsigned long)(di
+ 1), name_len
);
1266 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1267 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1269 over
= filldir(dirent
, name_ptr
, name_len
,
1274 if (name_ptr
!= tmp_name
)
1279 di_len
= btrfs_dir_name_len(leaf
, di
) +
1280 btrfs_dir_data_len(leaf
, di
) +sizeof(*di
);
1282 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1289 btrfs_release_path(root
, path
);
1290 btrfs_free_path(path
);
1291 mutex_unlock(&root
->fs_info
->fs_mutex
);
1295 int btrfs_write_inode(struct inode
*inode
, int wait
)
1297 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1298 struct btrfs_trans_handle
*trans
;
1302 mutex_lock(&root
->fs_info
->fs_mutex
);
1303 trans
= btrfs_start_transaction(root
, 1);
1304 btrfs_set_trans_block_group(trans
, inode
);
1305 ret
= btrfs_commit_transaction(trans
, root
);
1306 mutex_unlock(&root
->fs_info
->fs_mutex
);
1312 * This is somewhat expensive, updating the tree every time the
1313 * inode changes. But, it is most likely to find the inode in cache.
1314 * FIXME, needs more benchmarking...there are no reasons other than performance
1315 * to keep or drop this code.
1317 void btrfs_dirty_inode(struct inode
*inode
)
1319 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1320 struct btrfs_trans_handle
*trans
;
1322 mutex_lock(&root
->fs_info
->fs_mutex
);
1323 trans
= btrfs_start_transaction(root
, 1);
1324 btrfs_set_trans_block_group(trans
, inode
);
1325 btrfs_update_inode(trans
, root
, inode
);
1326 btrfs_end_transaction(trans
, root
);
1327 mutex_unlock(&root
->fs_info
->fs_mutex
);
1330 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1331 struct btrfs_root
*root
,
1333 struct btrfs_block_group_cache
*group
,
1336 struct inode
*inode
;
1337 struct btrfs_inode_item
*inode_item
;
1338 struct btrfs_key
*location
;
1339 struct btrfs_path
*path
;
1343 path
= btrfs_alloc_path();
1346 inode
= new_inode(root
->fs_info
->sb
);
1348 return ERR_PTR(-ENOMEM
);
1350 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1351 inode
->i_mapping
, GFP_NOFS
);
1352 BTRFS_I(inode
)->root
= root
;
1358 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1359 BTRFS_I(inode
)->block_group
= group
;
1361 ret
= btrfs_insert_empty_inode(trans
, root
, path
, objectid
);
1365 inode
->i_uid
= current
->fsuid
;
1366 inode
->i_gid
= current
->fsgid
;
1367 inode
->i_mode
= mode
;
1368 inode
->i_ino
= objectid
;
1369 inode
->i_blocks
= 0;
1370 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1371 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1372 struct btrfs_inode_item
);
1373 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1374 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1375 btrfs_free_path(path
);
1377 location
= &BTRFS_I(inode
)->location
;
1378 location
->objectid
= objectid
;
1379 location
->offset
= 0;
1380 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1382 insert_inode_hash(inode
);
1385 btrfs_free_path(path
);
1386 return ERR_PTR(ret
);
1389 static inline u8
btrfs_inode_type(struct inode
*inode
)
1391 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1394 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1395 struct dentry
*dentry
, struct inode
*inode
)
1398 struct btrfs_key key
;
1399 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1400 struct inode
*parent_inode
;
1402 key
.objectid
= inode
->i_ino
;
1403 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1406 ret
= btrfs_insert_dir_item(trans
, root
,
1407 dentry
->d_name
.name
, dentry
->d_name
.len
,
1408 dentry
->d_parent
->d_inode
->i_ino
,
1409 &key
, btrfs_inode_type(inode
));
1411 ret
= btrfs_insert_inode_ref(trans
, root
,
1412 dentry
->d_name
.name
,
1415 dentry
->d_parent
->d_inode
->i_ino
);
1416 parent_inode
= dentry
->d_parent
->d_inode
;
1417 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1418 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1419 ret
= btrfs_update_inode(trans
, root
,
1420 dentry
->d_parent
->d_inode
);
1425 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1426 struct dentry
*dentry
, struct inode
*inode
)
1428 int err
= btrfs_add_link(trans
, dentry
, inode
);
1430 d_instantiate(dentry
, inode
);
1438 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1439 int mode
, dev_t rdev
)
1441 struct btrfs_trans_handle
*trans
;
1442 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1443 struct inode
*inode
;
1449 if (!new_valid_dev(rdev
))
1452 mutex_lock(&root
->fs_info
->fs_mutex
);
1453 trans
= btrfs_start_transaction(root
, 1);
1454 btrfs_set_trans_block_group(trans
, dir
);
1456 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1462 inode
= btrfs_new_inode(trans
, root
, objectid
,
1463 BTRFS_I(dir
)->block_group
, mode
);
1464 err
= PTR_ERR(inode
);
1468 btrfs_set_trans_block_group(trans
, inode
);
1469 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1473 inode
->i_op
= &btrfs_special_inode_operations
;
1474 init_special_inode(inode
, inode
->i_mode
, rdev
);
1475 btrfs_update_inode(trans
, root
, inode
);
1477 dir
->i_sb
->s_dirt
= 1;
1478 btrfs_update_inode_block_group(trans
, inode
);
1479 btrfs_update_inode_block_group(trans
, dir
);
1481 nr
= trans
->blocks_used
;
1482 btrfs_end_transaction(trans
, root
);
1483 mutex_unlock(&root
->fs_info
->fs_mutex
);
1486 inode_dec_link_count(inode
);
1489 btrfs_btree_balance_dirty(root
, nr
);
1493 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1494 int mode
, struct nameidata
*nd
)
1496 struct btrfs_trans_handle
*trans
;
1497 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1498 struct inode
*inode
;
1504 mutex_lock(&root
->fs_info
->fs_mutex
);
1505 trans
= btrfs_start_transaction(root
, 1);
1506 btrfs_set_trans_block_group(trans
, dir
);
1508 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1514 inode
= btrfs_new_inode(trans
, root
, objectid
,
1515 BTRFS_I(dir
)->block_group
, mode
);
1516 err
= PTR_ERR(inode
);
1520 btrfs_set_trans_block_group(trans
, inode
);
1521 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1525 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1526 inode
->i_fop
= &btrfs_file_operations
;
1527 inode
->i_op
= &btrfs_file_inode_operations
;
1528 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
1529 inode
->i_mapping
, GFP_NOFS
);
1530 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
1532 dir
->i_sb
->s_dirt
= 1;
1533 btrfs_update_inode_block_group(trans
, inode
);
1534 btrfs_update_inode_block_group(trans
, dir
);
1536 nr
= trans
->blocks_used
;
1537 btrfs_end_transaction(trans
, root
);
1538 mutex_unlock(&root
->fs_info
->fs_mutex
);
1541 inode_dec_link_count(inode
);
1544 btrfs_btree_balance_dirty(root
, nr
);
1548 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1549 struct dentry
*dentry
)
1551 struct btrfs_trans_handle
*trans
;
1552 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1553 struct inode
*inode
= old_dentry
->d_inode
;
1558 if (inode
->i_nlink
== 0)
1561 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1566 mutex_lock(&root
->fs_info
->fs_mutex
);
1567 trans
= btrfs_start_transaction(root
, 1);
1569 btrfs_set_trans_block_group(trans
, dir
);
1570 atomic_inc(&inode
->i_count
);
1571 err
= btrfs_add_nondir(trans
, dentry
, inode
);
1576 dir
->i_sb
->s_dirt
= 1;
1577 btrfs_update_inode_block_group(trans
, dir
);
1578 err
= btrfs_update_inode(trans
, root
, inode
);
1583 nr
= trans
->blocks_used
;
1584 btrfs_end_transaction(trans
, root
);
1585 mutex_unlock(&root
->fs_info
->fs_mutex
);
1588 inode_dec_link_count(inode
);
1591 btrfs_btree_balance_dirty(root
, nr
);
1595 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1597 struct inode
*inode
;
1598 struct btrfs_trans_handle
*trans
;
1599 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1601 int drop_on_err
= 0;
1603 unsigned long nr
= 1;
1605 mutex_lock(&root
->fs_info
->fs_mutex
);
1606 trans
= btrfs_start_transaction(root
, 1);
1607 btrfs_set_trans_block_group(trans
, dir
);
1609 if (IS_ERR(trans
)) {
1610 err
= PTR_ERR(trans
);
1614 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1620 inode
= btrfs_new_inode(trans
, root
, objectid
,
1621 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1622 if (IS_ERR(inode
)) {
1623 err
= PTR_ERR(inode
);
1628 inode
->i_op
= &btrfs_dir_inode_operations
;
1629 inode
->i_fop
= &btrfs_dir_file_operations
;
1630 btrfs_set_trans_block_group(trans
, inode
);
1633 err
= btrfs_update_inode(trans
, root
, inode
);
1637 err
= btrfs_add_link(trans
, dentry
, inode
);
1641 d_instantiate(dentry
, inode
);
1643 dir
->i_sb
->s_dirt
= 1;
1644 btrfs_update_inode_block_group(trans
, inode
);
1645 btrfs_update_inode_block_group(trans
, dir
);
1648 nr
= trans
->blocks_used
;
1649 btrfs_end_transaction(trans
, root
);
1652 mutex_unlock(&root
->fs_info
->fs_mutex
);
1655 btrfs_btree_balance_dirty(root
, nr
);
1659 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1660 size_t page_offset
, u64 start
, u64 end
,
1666 u64 extent_start
= 0;
1668 u64 objectid
= inode
->i_ino
;
1670 int failed_insert
= 0;
1671 struct btrfs_path
*path
;
1672 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1673 struct btrfs_file_extent_item
*item
;
1674 struct extent_buffer
*leaf
;
1675 struct btrfs_key found_key
;
1676 struct extent_map
*em
= NULL
;
1677 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1678 struct btrfs_trans_handle
*trans
= NULL
;
1680 path
= btrfs_alloc_path();
1682 mutex_lock(&root
->fs_info
->fs_mutex
);
1685 em
= lookup_extent_mapping(em_tree
, start
, end
);
1690 em
= alloc_extent_map(GFP_NOFS
);
1695 em
->start
= EXTENT_MAP_HOLE
;
1696 em
->end
= EXTENT_MAP_HOLE
;
1698 em
->bdev
= inode
->i_sb
->s_bdev
;
1699 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
1700 objectid
, start
, trans
!= NULL
);
1707 if (path
->slots
[0] == 0)
1712 leaf
= path
->nodes
[0];
1713 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1714 struct btrfs_file_extent_item
);
1715 /* are we inside the extent that was found? */
1716 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1717 found_type
= btrfs_key_type(&found_key
);
1718 if (found_key
.objectid
!= objectid
||
1719 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1723 found_type
= btrfs_file_extent_type(leaf
, item
);
1724 extent_start
= found_key
.offset
;
1725 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1726 extent_end
= extent_start
+
1727 btrfs_file_extent_num_bytes(leaf
, item
);
1729 if (start
< extent_start
|| start
>= extent_end
) {
1731 if (start
< extent_start
) {
1732 if (end
< extent_start
)
1734 em
->end
= extent_end
- 1;
1740 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
1742 em
->start
= extent_start
;
1743 em
->end
= extent_end
- 1;
1744 em
->block_start
= EXTENT_MAP_HOLE
;
1745 em
->block_end
= EXTENT_MAP_HOLE
;
1748 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
1749 em
->block_start
= bytenr
;
1750 em
->block_end
= em
->block_start
+
1751 btrfs_file_extent_num_bytes(leaf
, item
) - 1;
1752 em
->start
= extent_start
;
1753 em
->end
= extent_end
- 1;
1755 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
1759 size_t extent_offset
;
1762 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
1764 extent_end
= (extent_start
+ size
- 1) |
1765 ((u64
)root
->sectorsize
- 1);
1766 if (start
< extent_start
|| start
>= extent_end
) {
1768 if (start
< extent_start
) {
1769 if (end
< extent_start
)
1771 em
->end
= extent_end
;
1777 em
->block_start
= EXTENT_MAP_INLINE
;
1778 em
->block_end
= EXTENT_MAP_INLINE
;
1781 em
->start
= extent_start
;
1782 em
->end
= extent_start
+ size
- 1;
1786 extent_offset
= ((u64
)page
->index
<< PAGE_CACHE_SHIFT
) -
1787 extent_start
+ page_offset
;
1788 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- page_offset
,
1789 size
- extent_offset
);
1790 em
->start
= extent_start
+ extent_offset
;
1791 em
->end
= (em
->start
+ copy_size
-1) |
1792 ((u64
)root
->sectorsize
-1);
1794 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
1795 if (create
== 0 && !PageUptodate(page
)) {
1796 read_extent_buffer(leaf
, map
+ page_offset
, ptr
,
1798 flush_dcache_page(page
);
1799 } else if (create
&& PageUptodate(page
)) {
1802 free_extent_map(em
);
1804 btrfs_release_path(root
, path
);
1805 trans
= btrfs_start_transaction(root
, 1);
1808 write_extent_buffer(leaf
, map
+ page_offset
, ptr
,
1810 btrfs_mark_buffer_dirty(leaf
);
1813 set_extent_uptodate(em_tree
, em
->start
, em
->end
, GFP_NOFS
);
1816 printk("unkknown found_type %d\n", found_type
);
1823 em
->block_start
= EXTENT_MAP_HOLE
;
1824 em
->block_end
= EXTENT_MAP_HOLE
;
1826 btrfs_release_path(root
, path
);
1827 if (em
->start
> start
|| em
->end
< start
) {
1828 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->end
, start
, end
);
1832 ret
= add_extent_mapping(em_tree
, em
);
1833 if (ret
== -EEXIST
) {
1834 free_extent_map(em
);
1836 if (0 && failed_insert
== 1) {
1837 btrfs_drop_extent_cache(inode
, start
, end
);
1840 if (failed_insert
> 5) {
1841 printk("failing to insert %Lu %Lu\n", start
, end
);
1849 btrfs_free_path(path
);
1851 ret
= btrfs_end_transaction(trans
, root
);
1855 mutex_unlock(&root
->fs_info
->fs_mutex
);
1857 free_extent_map(em
);
1859 return ERR_PTR(err
);
1864 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
1866 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
1869 static int btrfs_prepare_write(struct file
*file
, struct page
*page
,
1870 unsigned from
, unsigned to
)
1872 return extent_prepare_write(&BTRFS_I(page
->mapping
->host
)->extent_tree
,
1873 page
->mapping
->host
, page
, from
, to
,
1877 int btrfs_readpage(struct file
*file
, struct page
*page
)
1879 struct extent_map_tree
*tree
;
1880 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1881 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
1883 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
1885 struct extent_map_tree
*tree
;
1888 if (current
->flags
& PF_MEMALLOC
) {
1889 redirty_page_for_writepage(wbc
, page
);
1893 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1894 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
1897 static int btrfs_writepages(struct address_space
*mapping
,
1898 struct writeback_control
*wbc
)
1900 struct extent_map_tree
*tree
;
1901 tree
= &BTRFS_I(mapping
->host
)->extent_tree
;
1902 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
1906 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
1907 struct list_head
*pages
, unsigned nr_pages
)
1909 struct extent_map_tree
*tree
;
1910 tree
= &BTRFS_I(mapping
->host
)->extent_tree
;
1911 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
1915 static int btrfs_releasepage(struct page
*page
, gfp_t unused_gfp_flags
)
1917 struct extent_map_tree
*tree
;
1920 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1921 ret
= try_release_extent_mapping(tree
, page
);
1923 ClearPagePrivate(page
);
1924 set_page_private(page
, 0);
1925 page_cache_release(page
);
1930 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
1932 struct extent_map_tree
*tree
;
1934 tree
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
1935 extent_invalidatepage(tree
, page
, offset
);
1936 btrfs_releasepage(page
, GFP_NOFS
);
1940 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
1941 * called from a page fault handler when a page is first dirtied. Hence we must
1942 * be careful to check for EOF conditions here. We set the page up correctly
1943 * for a written page which means we get ENOSPC checking when writing into
1944 * holes and correct delalloc and unwritten extent mapping on filesystems that
1945 * support these features.
1947 * We are not allowed to take the i_mutex here so we have to play games to
1948 * protect against truncate races as the page could now be beyond EOF. Because
1949 * vmtruncate() writes the inode size before removing pages, once we have the
1950 * page lock we can determine safely if the page is beyond EOF. If it is not
1951 * beyond EOF, then the page is guaranteed safe against truncation until we
1954 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
1956 struct inode
*inode
= fdentry(vma
->vm_file
)->d_inode
;
1962 down_read(&BTRFS_I(inode
)->root
->snap_sem
);
1964 wait_on_page_writeback(page
);
1965 size
= i_size_read(inode
);
1966 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
1968 if ((page
->mapping
!= inode
->i_mapping
) ||
1969 (page_start
> size
)) {
1970 /* page got truncated out from underneath us */
1974 /* page is wholly or partially inside EOF */
1975 if (page_start
+ PAGE_CACHE_SIZE
> size
)
1976 end
= size
& ~PAGE_CACHE_MASK
;
1978 end
= PAGE_CACHE_SIZE
;
1980 ret
= btrfs_cow_one_page(inode
, page
, end
);
1983 up_read(&BTRFS_I(inode
)->root
->snap_sem
);
1988 static void btrfs_truncate(struct inode
*inode
)
1990 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1992 struct btrfs_trans_handle
*trans
;
1995 if (!S_ISREG(inode
->i_mode
))
1997 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
2000 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
2002 mutex_lock(&root
->fs_info
->fs_mutex
);
2003 trans
= btrfs_start_transaction(root
, 1);
2004 btrfs_set_trans_block_group(trans
, inode
);
2006 /* FIXME, add redo link to tree so we don't leak on crash */
2007 ret
= btrfs_truncate_in_trans(trans
, root
, inode
);
2008 btrfs_update_inode(trans
, root
, inode
);
2009 nr
= trans
->blocks_used
;
2011 ret
= btrfs_end_transaction(trans
, root
);
2013 mutex_unlock(&root
->fs_info
->fs_mutex
);
2014 btrfs_btree_balance_dirty(root
, nr
);
2017 int btrfs_commit_write(struct file
*file
, struct page
*page
,
2018 unsigned from
, unsigned to
)
2020 loff_t pos
= ((loff_t
)page
->index
<< PAGE_CACHE_SHIFT
) + to
;
2021 struct inode
*inode
= page
->mapping
->host
;
2023 btrfs_cow_one_page(inode
, page
, PAGE_CACHE_SIZE
);
2025 if (pos
> inode
->i_size
) {
2026 i_size_write(inode
, pos
);
2027 mark_inode_dirty(inode
);
2032 static int create_subvol(struct btrfs_root
*root
, char *name
, int namelen
)
2034 struct btrfs_trans_handle
*trans
;
2035 struct btrfs_key key
;
2036 struct btrfs_root_item root_item
;
2037 struct btrfs_inode_item
*inode_item
;
2038 struct extent_buffer
*leaf
;
2039 struct btrfs_root
*new_root
;
2040 struct inode
*inode
;
2045 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
2046 unsigned long nr
= 1;
2048 mutex_lock(&root
->fs_info
->fs_mutex
);
2049 trans
= btrfs_start_transaction(root
, 1);
2052 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
2057 leaf
= __btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
2058 objectid
, trans
->transid
, 0, 0,
2061 return PTR_ERR(leaf
);
2063 btrfs_set_header_nritems(leaf
, 0);
2064 btrfs_set_header_level(leaf
, 0);
2065 btrfs_set_header_bytenr(leaf
, leaf
->start
);
2066 btrfs_set_header_generation(leaf
, trans
->transid
);
2067 btrfs_set_header_owner(leaf
, objectid
);
2069 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
2070 (unsigned long)btrfs_header_fsid(leaf
),
2072 btrfs_mark_buffer_dirty(leaf
);
2074 inode_item
= &root_item
.inode
;
2075 memset(inode_item
, 0, sizeof(*inode_item
));
2076 inode_item
->generation
= cpu_to_le64(1);
2077 inode_item
->size
= cpu_to_le64(3);
2078 inode_item
->nlink
= cpu_to_le32(1);
2079 inode_item
->nblocks
= cpu_to_le64(1);
2080 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
2082 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
2083 btrfs_set_root_level(&root_item
, 0);
2084 btrfs_set_root_refs(&root_item
, 1);
2085 btrfs_set_root_used(&root_item
, 0);
2087 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
2088 root_item
.drop_level
= 0;
2090 free_extent_buffer(leaf
);
2093 btrfs_set_root_dirid(&root_item
, new_dirid
);
2095 key
.objectid
= objectid
;
2097 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
2098 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
2104 * insert the directory item
2106 key
.offset
= (u64
)-1;
2107 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
2108 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2109 name
, namelen
, dir
->i_ino
, &key
,
2114 ret
= btrfs_insert_inode_ref(trans
, root
->fs_info
->tree_root
,
2115 name
, namelen
, objectid
,
2116 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
);
2120 ret
= btrfs_commit_transaction(trans
, root
);
2124 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
2127 trans
= btrfs_start_transaction(new_root
, 1);
2130 inode
= btrfs_new_inode(trans
, new_root
, new_dirid
,
2131 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
2134 inode
->i_op
= &btrfs_dir_inode_operations
;
2135 inode
->i_fop
= &btrfs_dir_file_operations
;
2136 new_root
->inode
= inode
;
2138 ret
= btrfs_insert_inode_ref(trans
, new_root
, "..", 2, new_dirid
,
2142 ret
= btrfs_update_inode(trans
, new_root
, inode
);
2146 nr
= trans
->blocks_used
;
2147 err
= btrfs_commit_transaction(trans
, root
);
2151 mutex_unlock(&root
->fs_info
->fs_mutex
);
2152 btrfs_btree_balance_dirty(root
, nr
);
2156 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
2158 struct btrfs_trans_handle
*trans
;
2159 struct btrfs_key key
;
2160 struct btrfs_root_item new_root_item
;
2161 struct extent_buffer
*tmp
;
2167 if (!root
->ref_cows
)
2170 down_write(&root
->snap_sem
);
2171 freeze_bdev(root
->fs_info
->sb
->s_bdev
);
2172 thaw_bdev(root
->fs_info
->sb
->s_bdev
, root
->fs_info
->sb
);
2174 mutex_lock(&root
->fs_info
->fs_mutex
);
2175 trans
= btrfs_start_transaction(root
, 1);
2178 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
2182 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
2187 memcpy(&new_root_item
, &root
->root_item
,
2188 sizeof(new_root_item
));
2190 key
.objectid
= objectid
;
2192 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
2194 extent_buffer_get(root
->node
);
2195 btrfs_cow_block(trans
, root
, root
->node
, NULL
, 0, &tmp
);
2196 free_extent_buffer(tmp
);
2198 btrfs_copy_root(trans
, root
, root
->node
, &tmp
, objectid
);
2200 btrfs_set_root_bytenr(&new_root_item
, tmp
->start
);
2201 btrfs_set_root_level(&new_root_item
, btrfs_header_level(tmp
));
2202 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
2204 free_extent_buffer(tmp
);
2209 * insert the directory item
2211 key
.offset
= (u64
)-1;
2212 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2214 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2215 &key
, BTRFS_FT_DIR
);
2220 ret
= btrfs_insert_inode_ref(trans
, root
->fs_info
->tree_root
,
2221 name
, namelen
, objectid
,
2222 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
);
2227 nr
= trans
->blocks_used
;
2228 err
= btrfs_commit_transaction(trans
, root
);
2233 mutex_unlock(&root
->fs_info
->fs_mutex
);
2234 up_write(&root
->snap_sem
);
2235 btrfs_btree_balance_dirty(root
, nr
);
2239 static unsigned long force_ra(struct address_space
*mapping
,
2240 struct file_ra_state
*ra
, struct file
*file
,
2241 pgoff_t offset
, pgoff_t last_index
)
2245 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2246 req_size
= last_index
- offset
+ 1;
2247 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2250 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2251 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2252 return offset
+ req_size
;
2256 int btrfs_defrag_file(struct file
*file
) {
2257 struct inode
*inode
= fdentry(file
)->d_inode
;
2258 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
2260 unsigned long last_index
;
2261 unsigned long ra_index
= 0;
2266 mutex_lock(&inode
->i_mutex
);
2267 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2268 for (i
= 0; i
<= last_index
; i
++) {
2269 if (i
== ra_index
) {
2270 ra_index
= force_ra(inode
->i_mapping
, &file
->f_ra
,
2271 file
, ra_index
, last_index
);
2273 page
= grab_cache_page(inode
->i_mapping
, i
);
2276 if (!PageUptodate(page
)) {
2277 btrfs_readpage(NULL
, page
);
2279 if (!PageUptodate(page
)) {
2281 page_cache_release(page
);
2285 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2286 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2288 lock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2289 set_extent_delalloc(em_tree
, page_start
,
2290 page_end
, GFP_NOFS
);
2291 unlock_extent(em_tree
, page_start
, page_end
, GFP_NOFS
);
2292 set_page_dirty(page
);
2294 page_cache_release(page
);
2295 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2299 mutex_unlock(&inode
->i_mutex
);
2303 static int btrfs_ioctl_snap_create(struct btrfs_root
*root
, void __user
*arg
)
2305 struct btrfs_ioctl_vol_args
*vol_args
;
2306 struct btrfs_dir_item
*di
;
2307 struct btrfs_path
*path
;
2312 vol_args
= kmalloc(sizeof(*vol_args
), GFP_NOFS
);
2317 if (copy_from_user(vol_args
, arg
, sizeof(*vol_args
))) {
2322 namelen
= strlen(vol_args
->name
);
2323 if (namelen
> BTRFS_VOL_NAME_MAX
) {
2327 if (strchr(vol_args
->name
, '/')) {
2332 path
= btrfs_alloc_path();
2338 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2339 mutex_lock(&root
->fs_info
->fs_mutex
);
2340 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2342 vol_args
->name
, namelen
, 0);
2343 mutex_unlock(&root
->fs_info
->fs_mutex
);
2344 btrfs_free_path(path
);
2346 if (di
&& !IS_ERR(di
)) {
2356 if (root
== root
->fs_info
->tree_root
)
2357 ret
= create_subvol(root
, vol_args
->name
, namelen
);
2359 ret
= create_snapshot(root
, vol_args
->name
, namelen
);
2365 static int btrfs_ioctl_defrag(struct file
*file
)
2367 struct inode
*inode
= fdentry(file
)->d_inode
;
2368 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2370 switch (inode
->i_mode
& S_IFMT
) {
2372 mutex_lock(&root
->fs_info
->fs_mutex
);
2373 btrfs_defrag_root(root
, 0);
2374 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2375 mutex_unlock(&root
->fs_info
->fs_mutex
);
2378 btrfs_defrag_file(file
);
2385 long btrfs_ioctl(struct file
*file
, unsigned int
2386 cmd
, unsigned long arg
)
2388 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
2391 case BTRFS_IOC_SNAP_CREATE
:
2392 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2393 case BTRFS_IOC_DEFRAG
:
2394 return btrfs_ioctl_defrag(file
);
2401 * Called inside transaction, so use GFP_NOFS
2403 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2405 struct btrfs_inode
*ei
;
2407 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2411 return &ei
->vfs_inode
;
2414 void btrfs_destroy_inode(struct inode
*inode
)
2416 WARN_ON(!list_empty(&inode
->i_dentry
));
2417 WARN_ON(inode
->i_data
.nrpages
);
2419 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2422 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2423 static void init_once(struct kmem_cache
* cachep
, void *foo
)
2425 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2426 unsigned long flags
)
2429 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2431 inode_init_once(&ei
->vfs_inode
);
2434 void btrfs_destroy_cachep(void)
2436 if (btrfs_inode_cachep
)
2437 kmem_cache_destroy(btrfs_inode_cachep
);
2438 if (btrfs_trans_handle_cachep
)
2439 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2440 if (btrfs_transaction_cachep
)
2441 kmem_cache_destroy(btrfs_transaction_cachep
);
2442 if (btrfs_bit_radix_cachep
)
2443 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2444 if (btrfs_path_cachep
)
2445 kmem_cache_destroy(btrfs_path_cachep
);
2448 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2449 unsigned long extra_flags
,
2450 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2451 void (*ctor
)(struct kmem_cache
*, void *)
2453 void (*ctor
)(void *, struct kmem_cache
*,
2458 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2459 SLAB_MEM_SPREAD
| extra_flags
), ctor
2460 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2466 int btrfs_init_cachep(void)
2468 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2469 sizeof(struct btrfs_inode
),
2471 if (!btrfs_inode_cachep
)
2473 btrfs_trans_handle_cachep
=
2474 btrfs_cache_create("btrfs_trans_handle_cache",
2475 sizeof(struct btrfs_trans_handle
),
2477 if (!btrfs_trans_handle_cachep
)
2479 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2480 sizeof(struct btrfs_transaction
),
2482 if (!btrfs_transaction_cachep
)
2484 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2485 sizeof(struct btrfs_path
),
2487 if (!btrfs_path_cachep
)
2489 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2490 SLAB_DESTROY_BY_RCU
, NULL
);
2491 if (!btrfs_bit_radix_cachep
)
2495 btrfs_destroy_cachep();
2499 static int btrfs_getattr(struct vfsmount
*mnt
,
2500 struct dentry
*dentry
, struct kstat
*stat
)
2502 struct inode
*inode
= dentry
->d_inode
;
2503 generic_fillattr(inode
, stat
);
2504 stat
->blksize
= 256 * 1024;
2508 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2509 struct inode
* new_dir
,struct dentry
*new_dentry
)
2511 struct btrfs_trans_handle
*trans
;
2512 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2513 struct inode
*new_inode
= new_dentry
->d_inode
;
2514 struct inode
*old_inode
= old_dentry
->d_inode
;
2515 struct timespec ctime
= CURRENT_TIME
;
2516 struct btrfs_path
*path
;
2519 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2520 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2524 mutex_lock(&root
->fs_info
->fs_mutex
);
2525 trans
= btrfs_start_transaction(root
, 1);
2527 btrfs_set_trans_block_group(trans
, new_dir
);
2528 path
= btrfs_alloc_path();
2534 old_dentry
->d_inode
->i_nlink
++;
2535 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2536 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2537 old_inode
->i_ctime
= ctime
;
2539 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2544 new_inode
->i_ctime
= CURRENT_TIME
;
2545 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2549 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
);
2554 btrfs_free_path(path
);
2555 btrfs_end_transaction(trans
, root
);
2556 mutex_unlock(&root
->fs_info
->fs_mutex
);
2560 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2561 const char *symname
)
2563 struct btrfs_trans_handle
*trans
;
2564 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2565 struct btrfs_path
*path
;
2566 struct btrfs_key key
;
2567 struct inode
*inode
;
2574 struct btrfs_file_extent_item
*ei
;
2575 struct extent_buffer
*leaf
;
2578 name_len
= strlen(symname
) + 1;
2579 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2580 return -ENAMETOOLONG
;
2581 mutex_lock(&root
->fs_info
->fs_mutex
);
2582 trans
= btrfs_start_transaction(root
, 1);
2583 btrfs_set_trans_block_group(trans
, dir
);
2585 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2591 inode
= btrfs_new_inode(trans
, root
, objectid
,
2592 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2593 err
= PTR_ERR(inode
);
2597 btrfs_set_trans_block_group(trans
, inode
);
2598 err
= btrfs_add_nondir(trans
, dentry
, inode
);
2602 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2603 inode
->i_fop
= &btrfs_file_operations
;
2604 inode
->i_op
= &btrfs_file_inode_operations
;
2605 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
,
2606 inode
->i_mapping
, GFP_NOFS
);
2607 BTRFS_I(inode
)->extent_tree
.ops
= &btrfs_extent_map_ops
;
2609 dir
->i_sb
->s_dirt
= 1;
2610 btrfs_update_inode_block_group(trans
, inode
);
2611 btrfs_update_inode_block_group(trans
, dir
);
2615 path
= btrfs_alloc_path();
2617 key
.objectid
= inode
->i_ino
;
2619 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2620 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2621 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2627 leaf
= path
->nodes
[0];
2628 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2629 struct btrfs_file_extent_item
);
2630 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2631 btrfs_set_file_extent_type(leaf
, ei
,
2632 BTRFS_FILE_EXTENT_INLINE
);
2633 ptr
= btrfs_file_extent_inline_start(ei
);
2634 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
2635 btrfs_mark_buffer_dirty(leaf
);
2636 btrfs_free_path(path
);
2638 inode
->i_op
= &btrfs_symlink_inode_operations
;
2639 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2640 inode
->i_size
= name_len
- 1;
2641 err
= btrfs_update_inode(trans
, root
, inode
);
2646 nr
= trans
->blocks_used
;
2647 btrfs_end_transaction(trans
, root
);
2648 mutex_unlock(&root
->fs_info
->fs_mutex
);
2650 inode_dec_link_count(inode
);
2653 btrfs_btree_balance_dirty(root
, nr
);
2657 static struct inode_operations btrfs_dir_inode_operations
= {
2658 .lookup
= btrfs_lookup
,
2659 .create
= btrfs_create
,
2660 .unlink
= btrfs_unlink
,
2662 .mkdir
= btrfs_mkdir
,
2663 .rmdir
= btrfs_rmdir
,
2664 .rename
= btrfs_rename
,
2665 .symlink
= btrfs_symlink
,
2666 .setattr
= btrfs_setattr
,
2667 .mknod
= btrfs_mknod
,
2668 .setxattr
= generic_setxattr
,
2669 .getxattr
= generic_getxattr
,
2670 .listxattr
= btrfs_listxattr
,
2671 .removexattr
= generic_removexattr
,
2674 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2675 .lookup
= btrfs_lookup
,
2678 static struct file_operations btrfs_dir_file_operations
= {
2679 .llseek
= generic_file_llseek
,
2680 .read
= generic_read_dir
,
2681 .readdir
= btrfs_readdir
,
2682 .unlocked_ioctl
= btrfs_ioctl
,
2683 #ifdef CONFIG_COMPAT
2684 .compat_ioctl
= btrfs_ioctl
,
2688 static struct extent_map_ops btrfs_extent_map_ops
= {
2689 .fill_delalloc
= run_delalloc_range
,
2690 .writepage_io_hook
= btrfs_writepage_io_hook
,
2691 .readpage_io_hook
= btrfs_readpage_io_hook
,
2692 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
2695 static struct address_space_operations btrfs_aops
= {
2696 .readpage
= btrfs_readpage
,
2697 .writepage
= btrfs_writepage
,
2698 .writepages
= btrfs_writepages
,
2699 .readpages
= btrfs_readpages
,
2700 .sync_page
= block_sync_page
,
2701 .prepare_write
= btrfs_prepare_write
,
2702 .commit_write
= btrfs_commit_write
,
2704 .invalidatepage
= btrfs_invalidatepage
,
2705 .releasepage
= btrfs_releasepage
,
2706 .set_page_dirty
= __set_page_dirty_nobuffers
,
2709 static struct address_space_operations btrfs_symlink_aops
= {
2710 .readpage
= btrfs_readpage
,
2711 .writepage
= btrfs_writepage
,
2712 .invalidatepage
= btrfs_invalidatepage
,
2713 .releasepage
= btrfs_releasepage
,
2716 static struct inode_operations btrfs_file_inode_operations
= {
2717 .truncate
= btrfs_truncate
,
2718 .getattr
= btrfs_getattr
,
2719 .setattr
= btrfs_setattr
,
2720 .setxattr
= generic_setxattr
,
2721 .getxattr
= generic_getxattr
,
2722 .listxattr
= btrfs_listxattr
,
2723 .removexattr
= generic_removexattr
,
2726 static struct inode_operations btrfs_special_inode_operations
= {
2727 .getattr
= btrfs_getattr
,
2728 .setattr
= btrfs_setattr
,
2731 static struct inode_operations btrfs_symlink_inode_operations
= {
2732 .readlink
= generic_readlink
,
2733 .follow_link
= page_follow_link_light
,
2734 .put_link
= page_put_link
,