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_io_ops btrfs_extent_io_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 int btrfs_check_free_space(struct btrfs_root
*root
, u64 num_required
,
78 u64 total
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
79 u64 used
= btrfs_super_bytes_used(&root
->fs_info
->super_copy
);
90 spin_lock(&root
->fs_info
->delalloc_lock
);
91 if (used
+ root
->fs_info
->delalloc_bytes
+ num_required
> thresh
)
93 spin_unlock(&root
->fs_info
->delalloc_lock
);
97 static int cow_file_range(struct inode
*inode
, u64 start
, u64 end
)
99 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
100 struct btrfs_trans_handle
*trans
;
104 u64 blocksize
= root
->sectorsize
;
105 u64 orig_start
= start
;
107 struct btrfs_key ins
;
110 trans
= btrfs_start_transaction(root
, 1);
112 btrfs_set_trans_block_group(trans
, inode
);
114 num_bytes
= (end
- start
+ blocksize
) & ~(blocksize
- 1);
115 num_bytes
= max(blocksize
, num_bytes
);
116 ret
= btrfs_drop_extents(trans
, root
, inode
,
117 start
, start
+ num_bytes
, start
, &alloc_hint
);
118 orig_num_bytes
= num_bytes
;
120 if (alloc_hint
== EXTENT_MAP_INLINE
)
123 while(num_bytes
> 0) {
124 cur_alloc_size
= min(num_bytes
, root
->fs_info
->max_extent
);
125 ret
= btrfs_alloc_extent(trans
, root
, cur_alloc_size
,
126 root
->root_key
.objectid
,
128 inode
->i_ino
, start
, 0,
129 alloc_hint
, (u64
)-1, &ins
, 1);
134 ret
= btrfs_insert_file_extent(trans
, root
, inode
->i_ino
,
135 start
, ins
.objectid
, ins
.offset
,
137 btrfs_check_file(root
, inode
);
138 num_bytes
-= cur_alloc_size
;
139 alloc_hint
= ins
.objectid
+ ins
.offset
;
140 start
+= cur_alloc_size
;
142 btrfs_drop_extent_cache(inode
, orig_start
,
143 orig_start
+ orig_num_bytes
- 1);
144 btrfs_add_ordered_inode(inode
);
146 btrfs_end_transaction(trans
, root
);
150 static int run_delalloc_nocow(struct inode
*inode
, u64 start
, u64 end
)
158 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
159 struct extent_buffer
*leaf
;
161 struct btrfs_path
*path
;
162 struct btrfs_file_extent_item
*item
;
165 struct btrfs_key found_key
;
167 total_fs_bytes
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
168 path
= btrfs_alloc_path();
171 ret
= btrfs_lookup_file_extent(NULL
, root
, path
,
172 inode
->i_ino
, start
, 0);
174 btrfs_free_path(path
);
180 if (path
->slots
[0] == 0)
185 leaf
= path
->nodes
[0];
186 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
187 struct btrfs_file_extent_item
);
189 /* are we inside the extent that was found? */
190 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
191 found_type
= btrfs_key_type(&found_key
);
192 if (found_key
.objectid
!= inode
->i_ino
||
193 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
197 found_type
= btrfs_file_extent_type(leaf
, item
);
198 extent_start
= found_key
.offset
;
199 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
200 u64 extent_num_bytes
;
202 extent_num_bytes
= btrfs_file_extent_num_bytes(leaf
, item
);
203 extent_end
= extent_start
+ extent_num_bytes
;
206 if (loops
&& start
!= extent_start
)
209 if (start
< extent_start
|| start
>= extent_end
)
212 cow_end
= min(end
, extent_end
- 1);
213 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
218 * we may be called by the resizer, make sure we're inside
219 * the limits of the FS
221 if (bytenr
+ extent_num_bytes
> total_fs_bytes
)
224 if (btrfs_count_snapshots_in_path(root
, path
, bytenr
) != 1) {
234 btrfs_free_path(path
);
237 btrfs_release_path(root
, path
);
242 cow_file_range(inode
, start
, cow_end
);
247 static int run_delalloc_range(struct inode
*inode
, u64 start
, u64 end
)
249 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
251 mutex_lock(&root
->fs_info
->fs_mutex
);
252 if (btrfs_test_opt(root
, NODATACOW
) ||
253 btrfs_test_flag(inode
, NODATACOW
))
254 ret
= run_delalloc_nocow(inode
, start
, end
);
256 ret
= cow_file_range(inode
, start
, end
);
258 mutex_unlock(&root
->fs_info
->fs_mutex
);
262 int btrfs_set_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
263 unsigned long old
, unsigned long bits
)
265 if (!(old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
266 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
267 spin_lock(&root
->fs_info
->delalloc_lock
);
268 root
->fs_info
->delalloc_bytes
+= end
- start
+ 1;
269 spin_unlock(&root
->fs_info
->delalloc_lock
);
274 int btrfs_clear_bit_hook(struct inode
*inode
, u64 start
, u64 end
,
275 unsigned long old
, unsigned long bits
)
277 if ((old
& EXTENT_DELALLOC
) && (bits
& EXTENT_DELALLOC
)) {
278 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
279 spin_lock(&root
->fs_info
->delalloc_lock
);
280 if (end
- start
+ 1 > root
->fs_info
->delalloc_bytes
) {
281 printk("warning: delalloc account %Lu %Lu\n",
282 end
- start
+ 1, root
->fs_info
->delalloc_bytes
);
283 root
->fs_info
->delalloc_bytes
= 0;
285 root
->fs_info
->delalloc_bytes
-= end
- start
+ 1;
287 spin_unlock(&root
->fs_info
->delalloc_lock
);
292 int btrfs_writepage_io_hook(struct page
*page
, u64 start
, u64 end
)
294 struct inode
*inode
= page
->mapping
->host
;
295 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
296 struct btrfs_trans_handle
*trans
;
299 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
300 size_t offset
= start
- page_start
;
301 if (btrfs_test_opt(root
, NODATASUM
) ||
302 btrfs_test_flag(inode
, NODATASUM
))
304 mutex_lock(&root
->fs_info
->fs_mutex
);
305 trans
= btrfs_start_transaction(root
, 1);
306 btrfs_set_trans_block_group(trans
, inode
);
308 btrfs_csum_file_block(trans
, root
, inode
, inode
->i_ino
,
309 start
, kaddr
+ offset
, end
- start
+ 1);
311 ret
= btrfs_end_transaction(trans
, root
);
313 mutex_unlock(&root
->fs_info
->fs_mutex
);
317 int btrfs_readpage_io_hook(struct page
*page
, u64 start
, u64 end
)
320 struct inode
*inode
= page
->mapping
->host
;
321 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
322 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
323 struct btrfs_csum_item
*item
;
324 struct btrfs_path
*path
= NULL
;
326 if (btrfs_test_opt(root
, NODATASUM
) ||
327 btrfs_test_flag(inode
, NODATASUM
))
329 mutex_lock(&root
->fs_info
->fs_mutex
);
330 path
= btrfs_alloc_path();
331 item
= btrfs_lookup_csum(NULL
, root
, path
, inode
->i_ino
, start
, 0);
334 /* a csum that isn't present is a preallocated region. */
335 if (ret
== -ENOENT
|| ret
== -EFBIG
)
338 printk("no csum found for inode %lu start %Lu\n", inode
->i_ino
, start
);
341 read_extent_buffer(path
->nodes
[0], &csum
, (unsigned long)item
,
343 set_state_private(io_tree
, start
, csum
);
346 btrfs_free_path(path
);
347 mutex_unlock(&root
->fs_info
->fs_mutex
);
351 int btrfs_readpage_end_io_hook(struct page
*page
, u64 start
, u64 end
,
352 struct extent_state
*state
)
354 size_t offset
= start
- ((u64
)page
->index
<< PAGE_CACHE_SHIFT
);
355 struct inode
*inode
= page
->mapping
->host
;
356 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
358 u64
private = ~(u32
)0;
360 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
364 if (btrfs_test_opt(root
, NODATASUM
) ||
365 btrfs_test_flag(inode
, NODATASUM
))
368 if (state
->start
== start
) {
369 private = state
->private;
372 ret
= get_state_private(io_tree
, start
, &private);
374 local_irq_save(flags
);
375 kaddr
= kmap_atomic(page
, KM_IRQ0
);
379 csum
= btrfs_csum_data(root
, kaddr
+ offset
, csum
, end
- start
+ 1);
380 btrfs_csum_final(csum
, (char *)&csum
);
381 if (csum
!= private) {
384 kunmap_atomic(kaddr
, KM_IRQ0
);
385 local_irq_restore(flags
);
389 printk("btrfs csum failed ino %lu off %llu csum %u private %Lu\n",
390 page
->mapping
->host
->i_ino
, (unsigned long long)start
, csum
,
392 memset(kaddr
+ offset
, 1, end
- start
+ 1);
393 flush_dcache_page(page
);
394 kunmap_atomic(kaddr
, KM_IRQ0
);
395 local_irq_restore(flags
);
399 void btrfs_read_locked_inode(struct inode
*inode
)
401 struct btrfs_path
*path
;
402 struct extent_buffer
*leaf
;
403 struct btrfs_inode_item
*inode_item
;
404 struct btrfs_inode_timespec
*tspec
;
405 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
406 struct btrfs_key location
;
407 u64 alloc_group_block
;
411 path
= btrfs_alloc_path();
413 mutex_lock(&root
->fs_info
->fs_mutex
);
414 memcpy(&location
, &BTRFS_I(inode
)->location
, sizeof(location
));
416 ret
= btrfs_lookup_inode(NULL
, root
, path
, &location
, 0);
420 leaf
= path
->nodes
[0];
421 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
422 struct btrfs_inode_item
);
424 inode
->i_mode
= btrfs_inode_mode(leaf
, inode_item
);
425 inode
->i_nlink
= btrfs_inode_nlink(leaf
, inode_item
);
426 inode
->i_uid
= btrfs_inode_uid(leaf
, inode_item
);
427 inode
->i_gid
= btrfs_inode_gid(leaf
, inode_item
);
428 inode
->i_size
= btrfs_inode_size(leaf
, inode_item
);
430 tspec
= btrfs_inode_atime(inode_item
);
431 inode
->i_atime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
432 inode
->i_atime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
434 tspec
= btrfs_inode_mtime(inode_item
);
435 inode
->i_mtime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
436 inode
->i_mtime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
438 tspec
= btrfs_inode_ctime(inode_item
);
439 inode
->i_ctime
.tv_sec
= btrfs_timespec_sec(leaf
, tspec
);
440 inode
->i_ctime
.tv_nsec
= btrfs_timespec_nsec(leaf
, tspec
);
442 inode
->i_blocks
= btrfs_inode_nblocks(leaf
, inode_item
);
443 inode
->i_generation
= btrfs_inode_generation(leaf
, inode_item
);
445 rdev
= btrfs_inode_rdev(leaf
, inode_item
);
447 alloc_group_block
= btrfs_inode_block_group(leaf
, inode_item
);
448 BTRFS_I(inode
)->block_group
= btrfs_lookup_block_group(root
->fs_info
,
450 BTRFS_I(inode
)->flags
= btrfs_inode_flags(leaf
, inode_item
);
451 if (!BTRFS_I(inode
)->block_group
) {
452 BTRFS_I(inode
)->block_group
= btrfs_find_block_group(root
,
455 btrfs_free_path(path
);
458 mutex_unlock(&root
->fs_info
->fs_mutex
);
460 switch (inode
->i_mode
& S_IFMT
) {
462 inode
->i_mapping
->a_ops
= &btrfs_aops
;
463 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
464 inode
->i_fop
= &btrfs_file_operations
;
465 inode
->i_op
= &btrfs_file_inode_operations
;
468 inode
->i_fop
= &btrfs_dir_file_operations
;
469 if (root
== root
->fs_info
->tree_root
)
470 inode
->i_op
= &btrfs_dir_ro_inode_operations
;
472 inode
->i_op
= &btrfs_dir_inode_operations
;
475 inode
->i_op
= &btrfs_symlink_inode_operations
;
476 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
479 init_special_inode(inode
, inode
->i_mode
, rdev
);
485 btrfs_release_path(root
, path
);
486 btrfs_free_path(path
);
487 mutex_unlock(&root
->fs_info
->fs_mutex
);
488 make_bad_inode(inode
);
491 static void fill_inode_item(struct extent_buffer
*leaf
,
492 struct btrfs_inode_item
*item
,
495 btrfs_set_inode_uid(leaf
, item
, inode
->i_uid
);
496 btrfs_set_inode_gid(leaf
, item
, inode
->i_gid
);
497 btrfs_set_inode_size(leaf
, item
, inode
->i_size
);
498 btrfs_set_inode_mode(leaf
, item
, inode
->i_mode
);
499 btrfs_set_inode_nlink(leaf
, item
, inode
->i_nlink
);
501 btrfs_set_timespec_sec(leaf
, btrfs_inode_atime(item
),
502 inode
->i_atime
.tv_sec
);
503 btrfs_set_timespec_nsec(leaf
, btrfs_inode_atime(item
),
504 inode
->i_atime
.tv_nsec
);
506 btrfs_set_timespec_sec(leaf
, btrfs_inode_mtime(item
),
507 inode
->i_mtime
.tv_sec
);
508 btrfs_set_timespec_nsec(leaf
, btrfs_inode_mtime(item
),
509 inode
->i_mtime
.tv_nsec
);
511 btrfs_set_timespec_sec(leaf
, btrfs_inode_ctime(item
),
512 inode
->i_ctime
.tv_sec
);
513 btrfs_set_timespec_nsec(leaf
, btrfs_inode_ctime(item
),
514 inode
->i_ctime
.tv_nsec
);
516 btrfs_set_inode_nblocks(leaf
, item
, inode
->i_blocks
);
517 btrfs_set_inode_generation(leaf
, item
, inode
->i_generation
);
518 btrfs_set_inode_rdev(leaf
, item
, inode
->i_rdev
);
519 btrfs_set_inode_flags(leaf
, item
, BTRFS_I(inode
)->flags
);
520 btrfs_set_inode_block_group(leaf
, item
,
521 BTRFS_I(inode
)->block_group
->key
.objectid
);
524 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
525 struct btrfs_root
*root
,
528 struct btrfs_inode_item
*inode_item
;
529 struct btrfs_path
*path
;
530 struct extent_buffer
*leaf
;
533 path
= btrfs_alloc_path();
535 ret
= btrfs_lookup_inode(trans
, root
, path
,
536 &BTRFS_I(inode
)->location
, 1);
543 leaf
= path
->nodes
[0];
544 inode_item
= btrfs_item_ptr(leaf
, path
->slots
[0],
545 struct btrfs_inode_item
);
547 fill_inode_item(leaf
, inode_item
, inode
);
548 btrfs_mark_buffer_dirty(leaf
);
549 btrfs_set_inode_last_trans(trans
, inode
);
552 btrfs_release_path(root
, path
);
553 btrfs_free_path(path
);
558 static int btrfs_unlink_trans(struct btrfs_trans_handle
*trans
,
559 struct btrfs_root
*root
,
561 struct dentry
*dentry
)
563 struct btrfs_path
*path
;
564 const char *name
= dentry
->d_name
.name
;
565 int name_len
= dentry
->d_name
.len
;
567 struct extent_buffer
*leaf
;
568 struct btrfs_dir_item
*di
;
569 struct btrfs_key key
;
571 path
= btrfs_alloc_path();
577 di
= btrfs_lookup_dir_item(trans
, root
, path
, dir
->i_ino
,
587 leaf
= path
->nodes
[0];
588 btrfs_dir_item_key_to_cpu(leaf
, di
, &key
);
589 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
592 btrfs_release_path(root
, path
);
594 di
= btrfs_lookup_dir_index_item(trans
, root
, path
, dir
->i_ino
,
595 key
.objectid
, name
, name_len
, -1);
604 ret
= btrfs_delete_one_dir_name(trans
, root
, path
, di
);
606 dentry
->d_inode
->i_ctime
= dir
->i_ctime
;
607 ret
= btrfs_del_inode_ref(trans
, root
, name
, name_len
,
608 dentry
->d_inode
->i_ino
,
609 dentry
->d_parent
->d_inode
->i_ino
);
611 printk("failed to delete reference to %.*s, "
612 "inode %lu parent %lu\n", name_len
, name
,
613 dentry
->d_inode
->i_ino
,
614 dentry
->d_parent
->d_inode
->i_ino
);
617 btrfs_free_path(path
);
619 dir
->i_size
-= name_len
* 2;
620 dir
->i_mtime
= dir
->i_ctime
= CURRENT_TIME
;
621 btrfs_update_inode(trans
, root
, dir
);
622 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
623 dentry
->d_inode
->i_nlink
--;
625 drop_nlink(dentry
->d_inode
);
627 ret
= btrfs_update_inode(trans
, root
, dentry
->d_inode
);
628 dir
->i_sb
->s_dirt
= 1;
633 static int btrfs_unlink(struct inode
*dir
, struct dentry
*dentry
)
635 struct btrfs_root
*root
;
636 struct btrfs_trans_handle
*trans
;
637 struct inode
*inode
= dentry
->d_inode
;
639 unsigned long nr
= 0;
641 root
= BTRFS_I(dir
)->root
;
642 mutex_lock(&root
->fs_info
->fs_mutex
);
644 ret
= btrfs_check_free_space(root
, 1, 1);
648 trans
= btrfs_start_transaction(root
, 1);
650 btrfs_set_trans_block_group(trans
, dir
);
651 ret
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
652 nr
= trans
->blocks_used
;
654 if (inode
->i_nlink
== 0) {
656 /* if the inode isn't linked anywhere,
657 * we don't need to worry about
660 found
= btrfs_del_ordered_inode(inode
);
662 atomic_dec(&inode
->i_count
);
666 btrfs_end_transaction(trans
, root
);
668 mutex_unlock(&root
->fs_info
->fs_mutex
);
669 btrfs_btree_balance_dirty(root
, nr
);
670 btrfs_throttle(root
);
674 static int btrfs_rmdir(struct inode
*dir
, struct dentry
*dentry
)
676 struct inode
*inode
= dentry
->d_inode
;
679 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
680 struct btrfs_trans_handle
*trans
;
681 unsigned long nr
= 0;
683 if (inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
)
686 mutex_lock(&root
->fs_info
->fs_mutex
);
687 ret
= btrfs_check_free_space(root
, 1, 1);
691 trans
= btrfs_start_transaction(root
, 1);
692 btrfs_set_trans_block_group(trans
, dir
);
694 /* now the directory is empty */
695 err
= btrfs_unlink_trans(trans
, root
, dir
, dentry
);
700 nr
= trans
->blocks_used
;
701 ret
= btrfs_end_transaction(trans
, root
);
703 mutex_unlock(&root
->fs_info
->fs_mutex
);
704 btrfs_btree_balance_dirty(root
, nr
);
705 btrfs_throttle(root
);
713 * this can truncate away extent items, csum items and directory items.
714 * It starts at a high offset and removes keys until it can't find
715 * any higher than i_size.
717 * csum items that cross the new i_size are truncated to the new size
720 static int btrfs_truncate_in_trans(struct btrfs_trans_handle
*trans
,
721 struct btrfs_root
*root
,
726 struct btrfs_path
*path
;
727 struct btrfs_key key
;
728 struct btrfs_key found_key
;
730 struct extent_buffer
*leaf
;
731 struct btrfs_file_extent_item
*fi
;
732 u64 extent_start
= 0;
733 u64 extent_num_bytes
= 0;
739 int pending_del_nr
= 0;
740 int pending_del_slot
= 0;
741 int extent_type
= -1;
743 btrfs_drop_extent_cache(inode
, inode
->i_size
, (u64
)-1);
744 path
= btrfs_alloc_path();
748 /* FIXME, add redo link to tree so we don't leak on crash */
749 key
.objectid
= inode
->i_ino
;
750 key
.offset
= (u64
)-1;
753 btrfs_init_path(path
);
755 ret
= btrfs_search_slot(trans
, root
, &key
, path
, -1, 1);
760 BUG_ON(path
->slots
[0] == 0);
766 leaf
= path
->nodes
[0];
767 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
768 found_type
= btrfs_key_type(&found_key
);
770 if (found_key
.objectid
!= inode
->i_ino
)
773 if (found_type
< min_type
)
776 item_end
= found_key
.offset
;
777 if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
778 fi
= btrfs_item_ptr(leaf
, path
->slots
[0],
779 struct btrfs_file_extent_item
);
780 extent_type
= btrfs_file_extent_type(leaf
, fi
);
781 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
783 btrfs_file_extent_num_bytes(leaf
, fi
);
784 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
) {
785 struct btrfs_item
*item
= btrfs_item_nr(leaf
,
787 item_end
+= btrfs_file_extent_inline_len(leaf
,
792 if (found_type
== BTRFS_CSUM_ITEM_KEY
) {
793 ret
= btrfs_csum_truncate(trans
, root
, path
,
797 if (item_end
< inode
->i_size
) {
798 if (found_type
== BTRFS_DIR_ITEM_KEY
) {
799 found_type
= BTRFS_INODE_ITEM_KEY
;
800 } else if (found_type
== BTRFS_EXTENT_ITEM_KEY
) {
801 found_type
= BTRFS_CSUM_ITEM_KEY
;
802 } else if (found_type
== BTRFS_EXTENT_DATA_KEY
) {
803 found_type
= BTRFS_XATTR_ITEM_KEY
;
804 } else if (found_type
== BTRFS_XATTR_ITEM_KEY
) {
805 found_type
= BTRFS_INODE_REF_KEY
;
806 } else if (found_type
) {
811 btrfs_set_key_type(&key
, found_type
);
814 if (found_key
.offset
>= inode
->i_size
)
820 /* FIXME, shrink the extent if the ref count is only 1 */
821 if (found_type
!= BTRFS_EXTENT_DATA_KEY
)
824 if (extent_type
!= BTRFS_FILE_EXTENT_INLINE
) {
826 extent_start
= btrfs_file_extent_disk_bytenr(leaf
, fi
);
829 btrfs_file_extent_num_bytes(leaf
, fi
);
830 extent_num_bytes
= inode
->i_size
-
831 found_key
.offset
+ root
->sectorsize
- 1;
832 extent_num_bytes
= extent_num_bytes
&
833 ~((u64
)root
->sectorsize
- 1);
834 btrfs_set_file_extent_num_bytes(leaf
, fi
,
836 num_dec
= (orig_num_bytes
-
837 extent_num_bytes
) >> 9;
838 if (extent_start
!= 0) {
839 inode
->i_blocks
-= num_dec
;
841 btrfs_mark_buffer_dirty(leaf
);
844 btrfs_file_extent_disk_num_bytes(leaf
,
846 /* FIXME blocksize != 4096 */
847 num_dec
= btrfs_file_extent_num_bytes(leaf
,
849 if (extent_start
!= 0) {
851 inode
->i_blocks
-= num_dec
;
853 root_gen
= btrfs_header_generation(leaf
);
854 root_owner
= btrfs_header_owner(leaf
);
856 } else if (extent_type
== BTRFS_FILE_EXTENT_INLINE
&&
858 u32 newsize
= inode
->i_size
- found_key
.offset
;
859 newsize
= btrfs_file_extent_calc_inline_size(newsize
);
860 ret
= btrfs_truncate_item(trans
, root
, path
,
866 if (!pending_del_nr
) {
867 /* no pending yet, add ourselves */
868 pending_del_slot
= path
->slots
[0];
870 } else if (pending_del_nr
&&
871 path
->slots
[0] + 1 == pending_del_slot
) {
872 /* hop on the pending chunk */
874 pending_del_slot
= path
->slots
[0];
876 printk("bad pending slot %d pending_del_nr %d pending_del_slot %d\n", path
->slots
[0], pending_del_nr
, pending_del_slot
);
882 ret
= btrfs_free_extent(trans
, root
, extent_start
,
885 root_gen
, inode
->i_ino
,
886 found_key
.offset
, 0);
890 if (path
->slots
[0] == 0) {
893 btrfs_release_path(root
, path
);
898 if (pending_del_nr
&&
899 path
->slots
[0] + 1 != pending_del_slot
) {
900 struct btrfs_key debug
;
902 btrfs_item_key_to_cpu(path
->nodes
[0], &debug
,
904 ret
= btrfs_del_items(trans
, root
, path
,
909 btrfs_release_path(root
, path
);
915 if (pending_del_nr
) {
916 ret
= btrfs_del_items(trans
, root
, path
, pending_del_slot
,
919 btrfs_release_path(root
, path
);
920 btrfs_free_path(path
);
921 inode
->i_sb
->s_dirt
= 1;
925 static int btrfs_cow_one_page(struct inode
*inode
, struct page
*page
,
929 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
930 u64 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
931 u64 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
934 WARN_ON(!PageLocked(page
));
935 set_page_extent_mapped(page
);
937 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
938 set_extent_delalloc(&BTRFS_I(inode
)->io_tree
, page_start
,
941 if (zero_start
!= PAGE_CACHE_SIZE
) {
943 memset(kaddr
+ zero_start
, 0, PAGE_CACHE_SIZE
- zero_start
);
944 flush_dcache_page(page
);
947 set_page_dirty(page
);
948 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
954 * taken from block_truncate_page, but does cow as it zeros out
955 * any bytes left in the last page in the file.
957 static int btrfs_truncate_page(struct address_space
*mapping
, loff_t from
)
959 struct inode
*inode
= mapping
->host
;
960 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
961 u32 blocksize
= root
->sectorsize
;
962 pgoff_t index
= from
>> PAGE_CACHE_SHIFT
;
963 unsigned offset
= from
& (PAGE_CACHE_SIZE
-1);
968 if ((offset
& (blocksize
- 1)) == 0)
972 page
= grab_cache_page(mapping
, index
);
975 if (!PageUptodate(page
)) {
976 ret
= btrfs_readpage(NULL
, page
);
978 if (!PageUptodate(page
)) {
983 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
985 ret
= btrfs_cow_one_page(inode
, page
, offset
);
988 page_cache_release(page
);
993 static int btrfs_setattr(struct dentry
*dentry
, struct iattr
*attr
)
995 struct inode
*inode
= dentry
->d_inode
;
998 err
= inode_change_ok(inode
, attr
);
1002 if (S_ISREG(inode
->i_mode
) &&
1003 attr
->ia_valid
& ATTR_SIZE
&& attr
->ia_size
> inode
->i_size
) {
1004 struct btrfs_trans_handle
*trans
;
1005 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1006 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1008 u64 mask
= root
->sectorsize
- 1;
1009 u64 hole_start
= (inode
->i_size
+ mask
) & ~mask
;
1010 u64 block_end
= (attr
->ia_size
+ mask
) & ~mask
;
1014 if (attr
->ia_size
<= hole_start
)
1017 mutex_lock(&root
->fs_info
->fs_mutex
);
1018 err
= btrfs_check_free_space(root
, 1, 0);
1019 mutex_unlock(&root
->fs_info
->fs_mutex
);
1023 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
1025 lock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
1026 hole_size
= block_end
- hole_start
;
1028 mutex_lock(&root
->fs_info
->fs_mutex
);
1029 trans
= btrfs_start_transaction(root
, 1);
1030 btrfs_set_trans_block_group(trans
, inode
);
1031 err
= btrfs_drop_extents(trans
, root
, inode
,
1032 hole_start
, block_end
, hole_start
,
1035 if (alloc_hint
!= EXTENT_MAP_INLINE
) {
1036 err
= btrfs_insert_file_extent(trans
, root
,
1040 btrfs_drop_extent_cache(inode
, hole_start
,
1042 btrfs_check_file(root
, inode
);
1044 btrfs_end_transaction(trans
, root
);
1045 mutex_unlock(&root
->fs_info
->fs_mutex
);
1046 unlock_extent(io_tree
, hole_start
, block_end
- 1, GFP_NOFS
);
1051 err
= inode_setattr(inode
, attr
);
1056 void btrfs_put_inode(struct inode
*inode
)
1060 if (!BTRFS_I(inode
)->ordered_trans
) {
1064 if (mapping_tagged(inode
->i_mapping
, PAGECACHE_TAG_DIRTY
) ||
1065 mapping_tagged(inode
->i_mapping
, PAGECACHE_TAG_WRITEBACK
))
1068 ret
= btrfs_del_ordered_inode(inode
);
1070 atomic_dec(&inode
->i_count
);
1074 void btrfs_delete_inode(struct inode
*inode
)
1076 struct btrfs_trans_handle
*trans
;
1077 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1081 truncate_inode_pages(&inode
->i_data
, 0);
1082 if (is_bad_inode(inode
)) {
1087 mutex_lock(&root
->fs_info
->fs_mutex
);
1088 trans
= btrfs_start_transaction(root
, 1);
1090 btrfs_set_trans_block_group(trans
, inode
);
1091 ret
= btrfs_truncate_in_trans(trans
, root
, inode
, 0);
1093 goto no_delete_lock
;
1095 nr
= trans
->blocks_used
;
1098 btrfs_end_transaction(trans
, root
);
1099 mutex_unlock(&root
->fs_info
->fs_mutex
);
1100 btrfs_btree_balance_dirty(root
, nr
);
1101 btrfs_throttle(root
);
1105 nr
= trans
->blocks_used
;
1106 btrfs_end_transaction(trans
, root
);
1107 mutex_unlock(&root
->fs_info
->fs_mutex
);
1108 btrfs_btree_balance_dirty(root
, nr
);
1109 btrfs_throttle(root
);
1115 * this returns the key found in the dir entry in the location pointer.
1116 * If no dir entries were found, location->objectid is 0.
1118 static int btrfs_inode_by_name(struct inode
*dir
, struct dentry
*dentry
,
1119 struct btrfs_key
*location
)
1121 const char *name
= dentry
->d_name
.name
;
1122 int namelen
= dentry
->d_name
.len
;
1123 struct btrfs_dir_item
*di
;
1124 struct btrfs_path
*path
;
1125 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1128 if (namelen
== 1 && strcmp(name
, ".") == 0) {
1129 location
->objectid
= dir
->i_ino
;
1130 location
->type
= BTRFS_INODE_ITEM_KEY
;
1131 location
->offset
= 0;
1134 path
= btrfs_alloc_path();
1137 if (namelen
== 2 && strcmp(name
, "..") == 0) {
1138 struct btrfs_key key
;
1139 struct extent_buffer
*leaf
;
1143 key
.objectid
= dir
->i_ino
;
1144 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1146 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1150 leaf
= path
->nodes
[0];
1151 slot
= path
->slots
[0];
1152 nritems
= btrfs_header_nritems(leaf
);
1153 if (slot
>= nritems
)
1156 btrfs_item_key_to_cpu(leaf
, &key
, slot
);
1157 if (key
.objectid
!= dir
->i_ino
||
1158 key
.type
!= BTRFS_INODE_REF_KEY
) {
1161 location
->objectid
= key
.offset
;
1162 location
->type
= BTRFS_INODE_ITEM_KEY
;
1163 location
->offset
= 0;
1167 di
= btrfs_lookup_dir_item(NULL
, root
, path
, dir
->i_ino
, name
,
1171 if (!di
|| IS_ERR(di
)) {
1174 btrfs_dir_item_key_to_cpu(path
->nodes
[0], di
, location
);
1176 btrfs_free_path(path
);
1179 location
->objectid
= 0;
1184 * when we hit a tree root in a directory, the btrfs part of the inode
1185 * needs to be changed to reflect the root directory of the tree root. This
1186 * is kind of like crossing a mount point.
1188 static int fixup_tree_root_location(struct btrfs_root
*root
,
1189 struct btrfs_key
*location
,
1190 struct btrfs_root
**sub_root
,
1191 struct dentry
*dentry
)
1193 struct btrfs_path
*path
;
1194 struct btrfs_root_item
*ri
;
1196 if (btrfs_key_type(location
) != BTRFS_ROOT_ITEM_KEY
)
1198 if (location
->objectid
== BTRFS_ROOT_TREE_OBJECTID
)
1201 path
= btrfs_alloc_path();
1203 mutex_lock(&root
->fs_info
->fs_mutex
);
1205 *sub_root
= btrfs_read_fs_root(root
->fs_info
, location
,
1206 dentry
->d_name
.name
,
1207 dentry
->d_name
.len
);
1208 if (IS_ERR(*sub_root
))
1209 return PTR_ERR(*sub_root
);
1211 ri
= &(*sub_root
)->root_item
;
1212 location
->objectid
= btrfs_root_dirid(ri
);
1213 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1214 location
->offset
= 0;
1216 btrfs_free_path(path
);
1217 mutex_unlock(&root
->fs_info
->fs_mutex
);
1221 static int btrfs_init_locked_inode(struct inode
*inode
, void *p
)
1223 struct btrfs_iget_args
*args
= p
;
1224 inode
->i_ino
= args
->ino
;
1225 BTRFS_I(inode
)->root
= args
->root
;
1226 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1227 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1228 inode
->i_mapping
, GFP_NOFS
);
1232 static int btrfs_find_actor(struct inode
*inode
, void *opaque
)
1234 struct btrfs_iget_args
*args
= opaque
;
1235 return (args
->ino
== inode
->i_ino
&&
1236 args
->root
== BTRFS_I(inode
)->root
);
1239 struct inode
*btrfs_ilookup(struct super_block
*s
, u64 objectid
,
1242 struct btrfs_iget_args args
;
1243 args
.ino
= objectid
;
1244 args
.root
= btrfs_lookup_fs_root(btrfs_sb(s
)->fs_info
, root_objectid
);
1249 return ilookup5(s
, objectid
, btrfs_find_actor
, (void *)&args
);
1252 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1253 struct btrfs_root
*root
)
1255 struct inode
*inode
;
1256 struct btrfs_iget_args args
;
1257 args
.ino
= objectid
;
1260 inode
= iget5_locked(s
, objectid
, btrfs_find_actor
,
1261 btrfs_init_locked_inode
,
1266 static struct dentry
*btrfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
1267 struct nameidata
*nd
)
1269 struct inode
* inode
;
1270 struct btrfs_inode
*bi
= BTRFS_I(dir
);
1271 struct btrfs_root
*root
= bi
->root
;
1272 struct btrfs_root
*sub_root
= root
;
1273 struct btrfs_key location
;
1276 if (dentry
->d_name
.len
> BTRFS_NAME_LEN
)
1277 return ERR_PTR(-ENAMETOOLONG
);
1279 mutex_lock(&root
->fs_info
->fs_mutex
);
1280 ret
= btrfs_inode_by_name(dir
, dentry
, &location
);
1281 mutex_unlock(&root
->fs_info
->fs_mutex
);
1284 return ERR_PTR(ret
);
1287 if (location
.objectid
) {
1288 ret
= fixup_tree_root_location(root
, &location
, &sub_root
,
1291 return ERR_PTR(ret
);
1293 return ERR_PTR(-ENOENT
);
1294 inode
= btrfs_iget_locked(dir
->i_sb
, location
.objectid
,
1297 return ERR_PTR(-EACCES
);
1298 if (inode
->i_state
& I_NEW
) {
1299 /* the inode and parent dir are two different roots */
1300 if (sub_root
!= root
) {
1302 sub_root
->inode
= inode
;
1304 BTRFS_I(inode
)->root
= sub_root
;
1305 memcpy(&BTRFS_I(inode
)->location
, &location
,
1307 btrfs_read_locked_inode(inode
);
1308 unlock_new_inode(inode
);
1311 return d_splice_alias(inode
, dentry
);
1314 static unsigned char btrfs_filetype_table
[] = {
1315 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1318 static int btrfs_readdir(struct file
*filp
, void *dirent
, filldir_t filldir
)
1320 struct inode
*inode
= filp
->f_dentry
->d_inode
;
1321 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1322 struct btrfs_item
*item
;
1323 struct btrfs_dir_item
*di
;
1324 struct btrfs_key key
;
1325 struct btrfs_key found_key
;
1326 struct btrfs_path
*path
;
1329 struct extent_buffer
*leaf
;
1332 unsigned char d_type
;
1337 int key_type
= BTRFS_DIR_INDEX_KEY
;
1342 /* FIXME, use a real flag for deciding about the key type */
1343 if (root
->fs_info
->tree_root
== root
)
1344 key_type
= BTRFS_DIR_ITEM_KEY
;
1346 /* special case for "." */
1347 if (filp
->f_pos
== 0) {
1348 over
= filldir(dirent
, ".", 1,
1356 mutex_lock(&root
->fs_info
->fs_mutex
);
1357 key
.objectid
= inode
->i_ino
;
1358 path
= btrfs_alloc_path();
1361 /* special case for .., just use the back ref */
1362 if (filp
->f_pos
== 1) {
1363 btrfs_set_key_type(&key
, BTRFS_INODE_REF_KEY
);
1365 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1367 leaf
= path
->nodes
[0];
1368 slot
= path
->slots
[0];
1369 nritems
= btrfs_header_nritems(leaf
);
1370 if (slot
>= nritems
) {
1371 btrfs_release_path(root
, path
);
1372 goto read_dir_items
;
1374 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1375 btrfs_release_path(root
, path
);
1376 if (found_key
.objectid
!= key
.objectid
||
1377 found_key
.type
!= BTRFS_INODE_REF_KEY
)
1378 goto read_dir_items
;
1379 over
= filldir(dirent
, "..", 2,
1380 2, found_key
.offset
, DT_DIR
);
1387 btrfs_set_key_type(&key
, key_type
);
1388 key
.offset
= filp
->f_pos
;
1390 ret
= btrfs_search_slot(NULL
, root
, &key
, path
, 0, 0);
1395 leaf
= path
->nodes
[0];
1396 nritems
= btrfs_header_nritems(leaf
);
1397 slot
= path
->slots
[0];
1398 if (advance
|| slot
>= nritems
) {
1399 if (slot
>= nritems
-1) {
1400 ret
= btrfs_next_leaf(root
, path
);
1403 leaf
= path
->nodes
[0];
1404 nritems
= btrfs_header_nritems(leaf
);
1405 slot
= path
->slots
[0];
1412 item
= btrfs_item_nr(leaf
, slot
);
1413 btrfs_item_key_to_cpu(leaf
, &found_key
, slot
);
1415 if (found_key
.objectid
!= key
.objectid
)
1417 if (btrfs_key_type(&found_key
) != key_type
)
1419 if (found_key
.offset
< filp
->f_pos
)
1422 filp
->f_pos
= found_key
.offset
;
1424 di
= btrfs_item_ptr(leaf
, slot
, struct btrfs_dir_item
);
1426 di_total
= btrfs_item_size(leaf
, item
);
1427 while(di_cur
< di_total
) {
1428 struct btrfs_key location
;
1430 name_len
= btrfs_dir_name_len(leaf
, di
);
1431 if (name_len
< 32) {
1432 name_ptr
= tmp_name
;
1434 name_ptr
= kmalloc(name_len
, GFP_NOFS
);
1437 read_extent_buffer(leaf
, name_ptr
,
1438 (unsigned long)(di
+ 1), name_len
);
1440 d_type
= btrfs_filetype_table
[btrfs_dir_type(leaf
, di
)];
1441 btrfs_dir_item_key_to_cpu(leaf
, di
, &location
);
1442 over
= filldir(dirent
, name_ptr
, name_len
,
1447 if (name_ptr
!= tmp_name
)
1452 di_len
= btrfs_dir_name_len(leaf
, di
) +
1453 btrfs_dir_data_len(leaf
, di
) +sizeof(*di
);
1455 di
= (struct btrfs_dir_item
*)((char *)di
+ di_len
);
1458 filp
->f_pos
= INT_LIMIT(typeof(filp
->f_pos
));
1462 btrfs_release_path(root
, path
);
1463 btrfs_free_path(path
);
1464 mutex_unlock(&root
->fs_info
->fs_mutex
);
1468 int btrfs_write_inode(struct inode
*inode
, int wait
)
1470 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1471 struct btrfs_trans_handle
*trans
;
1475 mutex_lock(&root
->fs_info
->fs_mutex
);
1476 trans
= btrfs_start_transaction(root
, 1);
1477 btrfs_set_trans_block_group(trans
, inode
);
1478 ret
= btrfs_commit_transaction(trans
, root
);
1479 mutex_unlock(&root
->fs_info
->fs_mutex
);
1485 * This is somewhat expensive, updating the tree every time the
1486 * inode changes. But, it is most likely to find the inode in cache.
1487 * FIXME, needs more benchmarking...there are no reasons other than performance
1488 * to keep or drop this code.
1490 void btrfs_dirty_inode(struct inode
*inode
)
1492 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1493 struct btrfs_trans_handle
*trans
;
1495 mutex_lock(&root
->fs_info
->fs_mutex
);
1496 trans
= btrfs_start_transaction(root
, 1);
1497 btrfs_set_trans_block_group(trans
, inode
);
1498 btrfs_update_inode(trans
, root
, inode
);
1499 btrfs_end_transaction(trans
, root
);
1500 mutex_unlock(&root
->fs_info
->fs_mutex
);
1503 static struct inode
*btrfs_new_inode(struct btrfs_trans_handle
*trans
,
1504 struct btrfs_root
*root
,
1505 const char *name
, int name_len
,
1508 struct btrfs_block_group_cache
*group
,
1511 struct inode
*inode
;
1512 struct btrfs_inode_item
*inode_item
;
1513 struct btrfs_key
*location
;
1514 struct btrfs_path
*path
;
1515 struct btrfs_inode_ref
*ref
;
1516 struct btrfs_key key
[2];
1522 path
= btrfs_alloc_path();
1525 inode
= new_inode(root
->fs_info
->sb
);
1527 return ERR_PTR(-ENOMEM
);
1529 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1530 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1531 inode
->i_mapping
, GFP_NOFS
);
1532 BTRFS_I(inode
)->root
= root
;
1538 group
= btrfs_find_block_group(root
, group
, 0, 0, owner
);
1539 BTRFS_I(inode
)->block_group
= group
;
1540 BTRFS_I(inode
)->flags
= 0;
1542 key
[0].objectid
= objectid
;
1543 btrfs_set_key_type(&key
[0], BTRFS_INODE_ITEM_KEY
);
1546 key
[1].objectid
= objectid
;
1547 btrfs_set_key_type(&key
[1], BTRFS_INODE_REF_KEY
);
1548 key
[1].offset
= ref_objectid
;
1550 sizes
[0] = sizeof(struct btrfs_inode_item
);
1551 sizes
[1] = name_len
+ sizeof(*ref
);
1553 ret
= btrfs_insert_empty_items(trans
, root
, path
, key
, sizes
, 2);
1557 if (objectid
> root
->highest_inode
)
1558 root
->highest_inode
= objectid
;
1560 inode
->i_uid
= current
->fsuid
;
1561 inode
->i_gid
= current
->fsgid
;
1562 inode
->i_mode
= mode
;
1563 inode
->i_ino
= objectid
;
1564 inode
->i_blocks
= 0;
1565 inode
->i_mtime
= inode
->i_atime
= inode
->i_ctime
= CURRENT_TIME
;
1566 inode_item
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0],
1567 struct btrfs_inode_item
);
1568 fill_inode_item(path
->nodes
[0], inode_item
, inode
);
1570 ref
= btrfs_item_ptr(path
->nodes
[0], path
->slots
[0] + 1,
1571 struct btrfs_inode_ref
);
1572 btrfs_set_inode_ref_name_len(path
->nodes
[0], ref
, name_len
);
1573 ptr
= (unsigned long)(ref
+ 1);
1574 write_extent_buffer(path
->nodes
[0], name
, ptr
, name_len
);
1576 btrfs_mark_buffer_dirty(path
->nodes
[0]);
1577 btrfs_free_path(path
);
1579 location
= &BTRFS_I(inode
)->location
;
1580 location
->objectid
= objectid
;
1581 location
->offset
= 0;
1582 btrfs_set_key_type(location
, BTRFS_INODE_ITEM_KEY
);
1584 insert_inode_hash(inode
);
1587 btrfs_free_path(path
);
1588 return ERR_PTR(ret
);
1591 static inline u8
btrfs_inode_type(struct inode
*inode
)
1593 return btrfs_type_by_mode
[(inode
->i_mode
& S_IFMT
) >> S_SHIFT
];
1596 static int btrfs_add_link(struct btrfs_trans_handle
*trans
,
1597 struct dentry
*dentry
, struct inode
*inode
,
1601 struct btrfs_key key
;
1602 struct btrfs_root
*root
= BTRFS_I(dentry
->d_parent
->d_inode
)->root
;
1603 struct inode
*parent_inode
;
1605 key
.objectid
= inode
->i_ino
;
1606 btrfs_set_key_type(&key
, BTRFS_INODE_ITEM_KEY
);
1609 ret
= btrfs_insert_dir_item(trans
, root
,
1610 dentry
->d_name
.name
, dentry
->d_name
.len
,
1611 dentry
->d_parent
->d_inode
->i_ino
,
1612 &key
, btrfs_inode_type(inode
));
1615 ret
= btrfs_insert_inode_ref(trans
, root
,
1616 dentry
->d_name
.name
,
1619 dentry
->d_parent
->d_inode
->i_ino
);
1621 parent_inode
= dentry
->d_parent
->d_inode
;
1622 parent_inode
->i_size
+= dentry
->d_name
.len
* 2;
1623 parent_inode
->i_mtime
= parent_inode
->i_ctime
= CURRENT_TIME
;
1624 ret
= btrfs_update_inode(trans
, root
,
1625 dentry
->d_parent
->d_inode
);
1630 static int btrfs_add_nondir(struct btrfs_trans_handle
*trans
,
1631 struct dentry
*dentry
, struct inode
*inode
,
1634 int err
= btrfs_add_link(trans
, dentry
, inode
, backref
);
1636 d_instantiate(dentry
, inode
);
1644 static int btrfs_mknod(struct inode
*dir
, struct dentry
*dentry
,
1645 int mode
, dev_t rdev
)
1647 struct btrfs_trans_handle
*trans
;
1648 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1649 struct inode
*inode
= NULL
;
1653 unsigned long nr
= 0;
1655 if (!new_valid_dev(rdev
))
1658 mutex_lock(&root
->fs_info
->fs_mutex
);
1659 err
= btrfs_check_free_space(root
, 1, 0);
1663 trans
= btrfs_start_transaction(root
, 1);
1664 btrfs_set_trans_block_group(trans
, dir
);
1666 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1672 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
1674 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
1675 BTRFS_I(dir
)->block_group
, mode
);
1676 err
= PTR_ERR(inode
);
1680 btrfs_set_trans_block_group(trans
, inode
);
1681 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0);
1685 inode
->i_op
= &btrfs_special_inode_operations
;
1686 init_special_inode(inode
, inode
->i_mode
, rdev
);
1687 btrfs_update_inode(trans
, root
, inode
);
1689 dir
->i_sb
->s_dirt
= 1;
1690 btrfs_update_inode_block_group(trans
, inode
);
1691 btrfs_update_inode_block_group(trans
, dir
);
1693 nr
= trans
->blocks_used
;
1694 btrfs_end_transaction(trans
, root
);
1696 mutex_unlock(&root
->fs_info
->fs_mutex
);
1699 inode_dec_link_count(inode
);
1702 btrfs_btree_balance_dirty(root
, nr
);
1703 btrfs_throttle(root
);
1707 static int btrfs_create(struct inode
*dir
, struct dentry
*dentry
,
1708 int mode
, struct nameidata
*nd
)
1710 struct btrfs_trans_handle
*trans
;
1711 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1712 struct inode
*inode
= NULL
;
1715 unsigned long nr
= 0;
1718 mutex_lock(&root
->fs_info
->fs_mutex
);
1719 err
= btrfs_check_free_space(root
, 1, 0);
1722 trans
= btrfs_start_transaction(root
, 1);
1723 btrfs_set_trans_block_group(trans
, dir
);
1725 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1731 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
1733 dentry
->d_parent
->d_inode
->i_ino
,
1734 objectid
, BTRFS_I(dir
)->block_group
, mode
);
1735 err
= PTR_ERR(inode
);
1739 btrfs_set_trans_block_group(trans
, inode
);
1740 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0);
1744 inode
->i_mapping
->a_ops
= &btrfs_aops
;
1745 inode
->i_fop
= &btrfs_file_operations
;
1746 inode
->i_op
= &btrfs_file_inode_operations
;
1747 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
1748 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
1749 inode
->i_mapping
, GFP_NOFS
);
1750 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
1752 dir
->i_sb
->s_dirt
= 1;
1753 btrfs_update_inode_block_group(trans
, inode
);
1754 btrfs_update_inode_block_group(trans
, dir
);
1756 nr
= trans
->blocks_used
;
1757 btrfs_end_transaction(trans
, root
);
1759 mutex_unlock(&root
->fs_info
->fs_mutex
);
1762 inode_dec_link_count(inode
);
1765 btrfs_btree_balance_dirty(root
, nr
);
1766 btrfs_throttle(root
);
1770 static int btrfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1771 struct dentry
*dentry
)
1773 struct btrfs_trans_handle
*trans
;
1774 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1775 struct inode
*inode
= old_dentry
->d_inode
;
1776 unsigned long nr
= 0;
1780 if (inode
->i_nlink
== 0)
1783 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
1788 mutex_lock(&root
->fs_info
->fs_mutex
);
1789 err
= btrfs_check_free_space(root
, 1, 0);
1792 trans
= btrfs_start_transaction(root
, 1);
1794 btrfs_set_trans_block_group(trans
, dir
);
1795 atomic_inc(&inode
->i_count
);
1796 err
= btrfs_add_nondir(trans
, dentry
, inode
, 1);
1801 dir
->i_sb
->s_dirt
= 1;
1802 btrfs_update_inode_block_group(trans
, dir
);
1803 err
= btrfs_update_inode(trans
, root
, inode
);
1808 nr
= trans
->blocks_used
;
1809 btrfs_end_transaction(trans
, root
);
1811 mutex_unlock(&root
->fs_info
->fs_mutex
);
1814 inode_dec_link_count(inode
);
1817 btrfs_btree_balance_dirty(root
, nr
);
1818 btrfs_throttle(root
);
1822 static int btrfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
1824 struct inode
*inode
;
1825 struct btrfs_trans_handle
*trans
;
1826 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
1828 int drop_on_err
= 0;
1830 unsigned long nr
= 1;
1832 mutex_lock(&root
->fs_info
->fs_mutex
);
1833 err
= btrfs_check_free_space(root
, 1, 0);
1837 trans
= btrfs_start_transaction(root
, 1);
1838 btrfs_set_trans_block_group(trans
, dir
);
1840 if (IS_ERR(trans
)) {
1841 err
= PTR_ERR(trans
);
1845 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
1851 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
1853 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
1854 BTRFS_I(dir
)->block_group
, S_IFDIR
| mode
);
1855 if (IS_ERR(inode
)) {
1856 err
= PTR_ERR(inode
);
1861 inode
->i_op
= &btrfs_dir_inode_operations
;
1862 inode
->i_fop
= &btrfs_dir_file_operations
;
1863 btrfs_set_trans_block_group(trans
, inode
);
1866 err
= btrfs_update_inode(trans
, root
, inode
);
1870 err
= btrfs_add_link(trans
, dentry
, inode
, 0);
1874 d_instantiate(dentry
, inode
);
1876 dir
->i_sb
->s_dirt
= 1;
1877 btrfs_update_inode_block_group(trans
, inode
);
1878 btrfs_update_inode_block_group(trans
, dir
);
1881 nr
= trans
->blocks_used
;
1882 btrfs_end_transaction(trans
, root
);
1885 mutex_unlock(&root
->fs_info
->fs_mutex
);
1888 btrfs_btree_balance_dirty(root
, nr
);
1889 btrfs_throttle(root
);
1893 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1894 size_t pg_offset
, u64 start
, u64 len
,
1900 u64 extent_start
= 0;
1902 u64 objectid
= inode
->i_ino
;
1904 struct btrfs_path
*path
;
1905 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
1906 struct btrfs_file_extent_item
*item
;
1907 struct extent_buffer
*leaf
;
1908 struct btrfs_key found_key
;
1909 struct extent_map
*em
= NULL
;
1910 struct extent_map_tree
*em_tree
= &BTRFS_I(inode
)->extent_tree
;
1911 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
1912 struct btrfs_trans_handle
*trans
= NULL
;
1914 path
= btrfs_alloc_path();
1916 mutex_lock(&root
->fs_info
->fs_mutex
);
1919 spin_lock(&em_tree
->lock
);
1920 em
= lookup_extent_mapping(em_tree
, start
, len
);
1921 spin_unlock(&em_tree
->lock
);
1924 if (em
->start
> start
) {
1925 printk("get_extent lookup [%Lu %Lu] em [%Lu %Lu]\n",
1926 start
, len
, em
->start
, em
->len
);
1929 if (em
->block_start
== EXTENT_MAP_INLINE
&& page
)
1930 free_extent_map(em
);
1934 em
= alloc_extent_map(GFP_NOFS
);
1940 em
->start
= EXTENT_MAP_HOLE
;
1942 em
->bdev
= inode
->i_sb
->s_bdev
;
1943 ret
= btrfs_lookup_file_extent(trans
, root
, path
,
1944 objectid
, start
, trans
!= NULL
);
1951 if (path
->slots
[0] == 0)
1956 leaf
= path
->nodes
[0];
1957 item
= btrfs_item_ptr(leaf
, path
->slots
[0],
1958 struct btrfs_file_extent_item
);
1959 /* are we inside the extent that was found? */
1960 btrfs_item_key_to_cpu(leaf
, &found_key
, path
->slots
[0]);
1961 found_type
= btrfs_key_type(&found_key
);
1962 if (found_key
.objectid
!= objectid
||
1963 found_type
!= BTRFS_EXTENT_DATA_KEY
) {
1967 found_type
= btrfs_file_extent_type(leaf
, item
);
1968 extent_start
= found_key
.offset
;
1969 if (found_type
== BTRFS_FILE_EXTENT_REG
) {
1970 extent_end
= extent_start
+
1971 btrfs_file_extent_num_bytes(leaf
, item
);
1973 if (start
< extent_start
|| start
>= extent_end
) {
1975 if (start
< extent_start
) {
1976 if (start
+ len
<= extent_start
)
1978 em
->len
= extent_end
- extent_start
;
1984 bytenr
= btrfs_file_extent_disk_bytenr(leaf
, item
);
1986 em
->start
= extent_start
;
1987 em
->len
= extent_end
- extent_start
;
1988 em
->block_start
= EXTENT_MAP_HOLE
;
1991 bytenr
+= btrfs_file_extent_offset(leaf
, item
);
1992 em
->block_start
= bytenr
;
1993 em
->start
= extent_start
;
1994 em
->len
= extent_end
- extent_start
;
1996 } else if (found_type
== BTRFS_FILE_EXTENT_INLINE
) {
2001 size_t extent_offset
;
2004 size
= btrfs_file_extent_inline_len(leaf
, btrfs_item_nr(leaf
,
2006 extent_end
= (extent_start
+ size
+ root
->sectorsize
- 1) &
2007 ~((u64
)root
->sectorsize
- 1);
2008 if (start
< extent_start
|| start
>= extent_end
) {
2010 if (start
< extent_start
) {
2011 if (start
+ len
<= extent_start
)
2013 em
->len
= extent_end
- extent_start
;
2019 em
->block_start
= EXTENT_MAP_INLINE
;
2022 em
->start
= extent_start
;
2027 page_start
= page_offset(page
) + pg_offset
;
2028 extent_offset
= page_start
- extent_start
;
2029 copy_size
= min_t(u64
, PAGE_CACHE_SIZE
- pg_offset
,
2030 size
- extent_offset
);
2031 em
->start
= extent_start
+ extent_offset
;
2032 em
->len
= (copy_size
+ root
->sectorsize
- 1) &
2033 ~((u64
)root
->sectorsize
- 1);
2035 ptr
= btrfs_file_extent_inline_start(item
) + extent_offset
;
2036 if (create
== 0 && !PageUptodate(page
)) {
2037 read_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
2039 flush_dcache_page(page
);
2040 } else if (create
&& PageUptodate(page
)) {
2043 free_extent_map(em
);
2045 btrfs_release_path(root
, path
);
2046 trans
= btrfs_start_transaction(root
, 1);
2049 write_extent_buffer(leaf
, map
+ pg_offset
, ptr
,
2051 btrfs_mark_buffer_dirty(leaf
);
2054 set_extent_uptodate(io_tree
, em
->start
,
2055 extent_map_end(em
) - 1, GFP_NOFS
);
2058 printk("unkknown found_type %d\n", found_type
);
2065 em
->block_start
= EXTENT_MAP_HOLE
;
2067 btrfs_release_path(root
, path
);
2068 if (em
->start
> start
|| extent_map_end(em
) <= start
) {
2069 printk("bad extent! em: [%Lu %Lu] passed [%Lu %Lu]\n", em
->start
, em
->len
, start
, len
);
2075 spin_lock(&em_tree
->lock
);
2076 ret
= add_extent_mapping(em_tree
, em
);
2077 if (ret
== -EEXIST
) {
2078 free_extent_map(em
);
2079 em
= lookup_extent_mapping(em_tree
, start
, len
);
2082 printk("failing to insert %Lu %Lu\n", start
, len
);
2085 spin_unlock(&em_tree
->lock
);
2087 btrfs_free_path(path
);
2089 ret
= btrfs_end_transaction(trans
, root
);
2093 mutex_unlock(&root
->fs_info
->fs_mutex
);
2095 free_extent_map(em
);
2097 return ERR_PTR(err
);
2102 static sector_t
btrfs_bmap(struct address_space
*mapping
, sector_t iblock
)
2104 return extent_bmap(mapping
, iblock
, btrfs_get_extent
);
2107 int btrfs_readpage(struct file
*file
, struct page
*page
)
2109 struct extent_io_tree
*tree
;
2110 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2111 return extent_read_full_page(tree
, page
, btrfs_get_extent
);
2114 static int btrfs_writepage(struct page
*page
, struct writeback_control
*wbc
)
2116 struct extent_io_tree
*tree
;
2119 if (current
->flags
& PF_MEMALLOC
) {
2120 redirty_page_for_writepage(wbc
, page
);
2124 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2125 return extent_write_full_page(tree
, page
, btrfs_get_extent
, wbc
);
2128 static int btrfs_writepages(struct address_space
*mapping
,
2129 struct writeback_control
*wbc
)
2131 struct extent_io_tree
*tree
;
2132 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
2133 return extent_writepages(tree
, mapping
, btrfs_get_extent
, wbc
);
2137 btrfs_readpages(struct file
*file
, struct address_space
*mapping
,
2138 struct list_head
*pages
, unsigned nr_pages
)
2140 struct extent_io_tree
*tree
;
2141 tree
= &BTRFS_I(mapping
->host
)->io_tree
;
2142 return extent_readpages(tree
, mapping
, pages
, nr_pages
,
2146 static int btrfs_releasepage(struct page
*page
, gfp_t gfp_flags
)
2148 struct extent_io_tree
*tree
;
2149 struct extent_map_tree
*map
;
2152 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2153 map
= &BTRFS_I(page
->mapping
->host
)->extent_tree
;
2154 ret
= try_release_extent_mapping(map
, tree
, page
, gfp_flags
);
2156 ClearPagePrivate(page
);
2157 set_page_private(page
, 0);
2158 page_cache_release(page
);
2163 static void btrfs_invalidatepage(struct page
*page
, unsigned long offset
)
2165 struct extent_io_tree
*tree
;
2167 tree
= &BTRFS_I(page
->mapping
->host
)->io_tree
;
2168 extent_invalidatepage(tree
, page
, offset
);
2169 btrfs_releasepage(page
, GFP_NOFS
);
2173 * btrfs_page_mkwrite() is not allowed to change the file size as it gets
2174 * called from a page fault handler when a page is first dirtied. Hence we must
2175 * be careful to check for EOF conditions here. We set the page up correctly
2176 * for a written page which means we get ENOSPC checking when writing into
2177 * holes and correct delalloc and unwritten extent mapping on filesystems that
2178 * support these features.
2180 * We are not allowed to take the i_mutex here so we have to play games to
2181 * protect against truncate races as the page could now be beyond EOF. Because
2182 * vmtruncate() writes the inode size before removing pages, once we have the
2183 * page lock we can determine safely if the page is beyond EOF. If it is not
2184 * beyond EOF, then the page is guaranteed safe against truncation until we
2187 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
)
2189 struct inode
*inode
= fdentry(vma
->vm_file
)->d_inode
;
2190 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2196 mutex_lock(&root
->fs_info
->fs_mutex
);
2197 ret
= btrfs_check_free_space(root
, PAGE_CACHE_SIZE
, 0);
2198 mutex_unlock(&root
->fs_info
->fs_mutex
);
2205 wait_on_page_writeback(page
);
2206 size
= i_size_read(inode
);
2207 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2209 if ((page
->mapping
!= inode
->i_mapping
) ||
2210 (page_start
> size
)) {
2211 /* page got truncated out from underneath us */
2215 /* page is wholly or partially inside EOF */
2216 if (page_start
+ PAGE_CACHE_SIZE
> size
)
2217 end
= size
& ~PAGE_CACHE_MASK
;
2219 end
= PAGE_CACHE_SIZE
;
2221 ret
= btrfs_cow_one_page(inode
, page
, end
);
2229 static void btrfs_truncate(struct inode
*inode
)
2231 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2233 struct btrfs_trans_handle
*trans
;
2236 if (!S_ISREG(inode
->i_mode
))
2238 if (IS_APPEND(inode
) || IS_IMMUTABLE(inode
))
2241 btrfs_truncate_page(inode
->i_mapping
, inode
->i_size
);
2243 mutex_lock(&root
->fs_info
->fs_mutex
);
2244 trans
= btrfs_start_transaction(root
, 1);
2245 btrfs_set_trans_block_group(trans
, inode
);
2247 /* FIXME, add redo link to tree so we don't leak on crash */
2248 ret
= btrfs_truncate_in_trans(trans
, root
, inode
,
2249 BTRFS_EXTENT_DATA_KEY
);
2250 btrfs_update_inode(trans
, root
, inode
);
2251 nr
= trans
->blocks_used
;
2253 ret
= btrfs_end_transaction(trans
, root
);
2255 mutex_unlock(&root
->fs_info
->fs_mutex
);
2256 btrfs_btree_balance_dirty(root
, nr
);
2257 btrfs_throttle(root
);
2260 static int noinline
create_subvol(struct btrfs_root
*root
, char *name
,
2263 struct btrfs_trans_handle
*trans
;
2264 struct btrfs_key key
;
2265 struct btrfs_root_item root_item
;
2266 struct btrfs_inode_item
*inode_item
;
2267 struct extent_buffer
*leaf
;
2268 struct btrfs_root
*new_root
= root
;
2269 struct inode
*inode
;
2274 u64 new_dirid
= BTRFS_FIRST_FREE_OBJECTID
;
2275 unsigned long nr
= 1;
2277 mutex_lock(&root
->fs_info
->fs_mutex
);
2278 ret
= btrfs_check_free_space(root
, 1, 0);
2282 trans
= btrfs_start_transaction(root
, 1);
2285 ret
= btrfs_find_free_objectid(trans
, root
->fs_info
->tree_root
,
2290 leaf
= __btrfs_alloc_free_block(trans
, root
, root
->leafsize
,
2291 objectid
, trans
->transid
, 0, 0,
2294 return PTR_ERR(leaf
);
2296 btrfs_set_header_nritems(leaf
, 0);
2297 btrfs_set_header_level(leaf
, 0);
2298 btrfs_set_header_bytenr(leaf
, leaf
->start
);
2299 btrfs_set_header_generation(leaf
, trans
->transid
);
2300 btrfs_set_header_owner(leaf
, objectid
);
2302 write_extent_buffer(leaf
, root
->fs_info
->fsid
,
2303 (unsigned long)btrfs_header_fsid(leaf
),
2305 btrfs_mark_buffer_dirty(leaf
);
2307 inode_item
= &root_item
.inode
;
2308 memset(inode_item
, 0, sizeof(*inode_item
));
2309 inode_item
->generation
= cpu_to_le64(1);
2310 inode_item
->size
= cpu_to_le64(3);
2311 inode_item
->nlink
= cpu_to_le32(1);
2312 inode_item
->nblocks
= cpu_to_le64(1);
2313 inode_item
->mode
= cpu_to_le32(S_IFDIR
| 0755);
2315 btrfs_set_root_bytenr(&root_item
, leaf
->start
);
2316 btrfs_set_root_level(&root_item
, 0);
2317 btrfs_set_root_refs(&root_item
, 1);
2318 btrfs_set_root_used(&root_item
, 0);
2320 memset(&root_item
.drop_progress
, 0, sizeof(root_item
.drop_progress
));
2321 root_item
.drop_level
= 0;
2323 free_extent_buffer(leaf
);
2326 btrfs_set_root_dirid(&root_item
, new_dirid
);
2328 key
.objectid
= objectid
;
2330 btrfs_set_key_type(&key
, BTRFS_ROOT_ITEM_KEY
);
2331 ret
= btrfs_insert_root(trans
, root
->fs_info
->tree_root
, &key
,
2337 * insert the directory item
2339 key
.offset
= (u64
)-1;
2340 dir
= root
->fs_info
->sb
->s_root
->d_inode
;
2341 ret
= btrfs_insert_dir_item(trans
, root
->fs_info
->tree_root
,
2342 name
, namelen
, dir
->i_ino
, &key
,
2347 ret
= btrfs_insert_inode_ref(trans
, root
->fs_info
->tree_root
,
2348 name
, namelen
, objectid
,
2349 root
->fs_info
->sb
->s_root
->d_inode
->i_ino
);
2353 ret
= btrfs_commit_transaction(trans
, root
);
2357 new_root
= btrfs_read_fs_root(root
->fs_info
, &key
, name
, namelen
);
2360 trans
= btrfs_start_transaction(new_root
, 1);
2363 inode
= btrfs_new_inode(trans
, new_root
, "..", 2, new_dirid
,
2365 BTRFS_I(dir
)->block_group
, S_IFDIR
| 0700);
2368 inode
->i_op
= &btrfs_dir_inode_operations
;
2369 inode
->i_fop
= &btrfs_dir_file_operations
;
2370 new_root
->inode
= inode
;
2372 ret
= btrfs_insert_inode_ref(trans
, new_root
, "..", 2, new_dirid
,
2376 ret
= btrfs_update_inode(trans
, new_root
, inode
);
2380 nr
= trans
->blocks_used
;
2381 err
= btrfs_commit_transaction(trans
, new_root
);
2385 mutex_unlock(&root
->fs_info
->fs_mutex
);
2386 btrfs_btree_balance_dirty(root
, nr
);
2387 btrfs_throttle(root
);
2391 static int create_snapshot(struct btrfs_root
*root
, char *name
, int namelen
)
2393 struct btrfs_pending_snapshot
*pending_snapshot
;
2394 struct btrfs_trans_handle
*trans
;
2397 unsigned long nr
= 0;
2399 if (!root
->ref_cows
)
2402 mutex_lock(&root
->fs_info
->fs_mutex
);
2403 ret
= btrfs_check_free_space(root
, 1, 0);
2407 pending_snapshot
= kmalloc(sizeof(*pending_snapshot
), GFP_NOFS
);
2408 if (!pending_snapshot
) {
2412 pending_snapshot
->name
= kmalloc(namelen
+ 1, GFP_NOFS
);
2413 if (!pending_snapshot
->name
) {
2415 kfree(pending_snapshot
);
2418 memcpy(pending_snapshot
->name
, name
, namelen
);
2419 pending_snapshot
->name
[namelen
] = '\0';
2420 trans
= btrfs_start_transaction(root
, 1);
2422 pending_snapshot
->root
= root
;
2423 list_add(&pending_snapshot
->list
,
2424 &trans
->transaction
->pending_snapshots
);
2425 ret
= btrfs_update_inode(trans
, root
, root
->inode
);
2426 err
= btrfs_commit_transaction(trans
, root
);
2429 mutex_unlock(&root
->fs_info
->fs_mutex
);
2430 btrfs_btree_balance_dirty(root
, nr
);
2431 btrfs_throttle(root
);
2435 unsigned long btrfs_force_ra(struct address_space
*mapping
,
2436 struct file_ra_state
*ra
, struct file
*file
,
2437 pgoff_t offset
, pgoff_t last_index
)
2441 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2442 req_size
= last_index
- offset
+ 1;
2443 offset
= page_cache_readahead(mapping
, ra
, file
, offset
, req_size
);
2446 req_size
= min(last_index
- offset
+ 1, (pgoff_t
)128);
2447 page_cache_sync_readahead(mapping
, ra
, file
, offset
, req_size
);
2448 return offset
+ req_size
;
2452 int btrfs_defrag_file(struct file
*file
) {
2453 struct inode
*inode
= fdentry(file
)->d_inode
;
2454 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2455 struct extent_io_tree
*io_tree
= &BTRFS_I(inode
)->io_tree
;
2457 unsigned long last_index
;
2458 unsigned long ra_index
= 0;
2464 mutex_lock(&root
->fs_info
->fs_mutex
);
2465 ret
= btrfs_check_free_space(root
, inode
->i_size
, 0);
2466 mutex_unlock(&root
->fs_info
->fs_mutex
);
2470 mutex_lock(&inode
->i_mutex
);
2471 last_index
= inode
->i_size
>> PAGE_CACHE_SHIFT
;
2472 for (i
= 0; i
<= last_index
; i
++) {
2473 if (i
== ra_index
) {
2474 ra_index
= btrfs_force_ra(inode
->i_mapping
,
2476 file
, ra_index
, last_index
);
2478 page
= grab_cache_page(inode
->i_mapping
, i
);
2481 if (!PageUptodate(page
)) {
2482 btrfs_readpage(NULL
, page
);
2484 if (!PageUptodate(page
)) {
2486 page_cache_release(page
);
2490 page_start
= (u64
)page
->index
<< PAGE_CACHE_SHIFT
;
2491 page_end
= page_start
+ PAGE_CACHE_SIZE
- 1;
2493 lock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2494 set_extent_delalloc(io_tree
, page_start
,
2495 page_end
, GFP_NOFS
);
2497 unlock_extent(io_tree
, page_start
, page_end
, GFP_NOFS
);
2498 set_page_dirty(page
);
2500 page_cache_release(page
);
2501 balance_dirty_pages_ratelimited_nr(inode
->i_mapping
, 1);
2505 mutex_unlock(&inode
->i_mutex
);
2509 static int btrfs_ioctl_resize(struct btrfs_root
*root
, void __user
*arg
)
2513 struct btrfs_ioctl_vol_args
*vol_args
;
2514 struct btrfs_trans_handle
*trans
;
2520 vol_args
= kmalloc(sizeof(*vol_args
), GFP_NOFS
);
2525 if (copy_from_user(vol_args
, arg
, sizeof(*vol_args
))) {
2529 namelen
= strlen(vol_args
->name
);
2530 if (namelen
> BTRFS_VOL_NAME_MAX
) {
2535 sizestr
= vol_args
->name
;
2536 if (!strcmp(sizestr
, "max"))
2537 new_size
= root
->fs_info
->sb
->s_bdev
->bd_inode
->i_size
;
2539 if (sizestr
[0] == '-') {
2542 } else if (sizestr
[0] == '+') {
2546 new_size
= btrfs_parse_size(sizestr
);
2547 if (new_size
== 0) {
2553 mutex_lock(&root
->fs_info
->fs_mutex
);
2554 old_size
= btrfs_super_total_bytes(&root
->fs_info
->super_copy
);
2557 if (new_size
> old_size
) {
2561 new_size
= old_size
- new_size
;
2562 } else if (mod
> 0) {
2563 new_size
= old_size
+ new_size
;
2566 if (new_size
< 256 * 1024 * 1024) {
2570 if (new_size
> root
->fs_info
->sb
->s_bdev
->bd_inode
->i_size
) {
2575 do_div(new_size
, root
->sectorsize
);
2576 new_size
*= root
->sectorsize
;
2578 printk("new size is %Lu\n", new_size
);
2579 if (new_size
> old_size
) {
2580 trans
= btrfs_start_transaction(root
, 1);
2581 ret
= btrfs_grow_extent_tree(trans
, root
, new_size
);
2582 btrfs_commit_transaction(trans
, root
);
2584 ret
= btrfs_shrink_extent_tree(root
, new_size
);
2588 mutex_unlock(&root
->fs_info
->fs_mutex
);
2594 static int noinline
btrfs_ioctl_snap_create(struct btrfs_root
*root
,
2597 struct btrfs_ioctl_vol_args
*vol_args
;
2598 struct btrfs_dir_item
*di
;
2599 struct btrfs_path
*path
;
2604 vol_args
= kmalloc(sizeof(*vol_args
), GFP_NOFS
);
2609 if (copy_from_user(vol_args
, arg
, sizeof(*vol_args
))) {
2614 namelen
= strlen(vol_args
->name
);
2615 if (namelen
> BTRFS_VOL_NAME_MAX
) {
2619 if (strchr(vol_args
->name
, '/')) {
2624 path
= btrfs_alloc_path();
2630 root_dirid
= root
->fs_info
->sb
->s_root
->d_inode
->i_ino
,
2631 mutex_lock(&root
->fs_info
->fs_mutex
);
2632 di
= btrfs_lookup_dir_item(NULL
, root
->fs_info
->tree_root
,
2634 vol_args
->name
, namelen
, 0);
2635 mutex_unlock(&root
->fs_info
->fs_mutex
);
2636 btrfs_free_path(path
);
2638 if (di
&& !IS_ERR(di
)) {
2648 if (root
== root
->fs_info
->tree_root
)
2649 ret
= create_subvol(root
, vol_args
->name
, namelen
);
2651 ret
= create_snapshot(root
, vol_args
->name
, namelen
);
2657 static int btrfs_ioctl_defrag(struct file
*file
)
2659 struct inode
*inode
= fdentry(file
)->d_inode
;
2660 struct btrfs_root
*root
= BTRFS_I(inode
)->root
;
2662 switch (inode
->i_mode
& S_IFMT
) {
2664 mutex_lock(&root
->fs_info
->fs_mutex
);
2665 btrfs_defrag_root(root
, 0);
2666 btrfs_defrag_root(root
->fs_info
->extent_root
, 0);
2667 mutex_unlock(&root
->fs_info
->fs_mutex
);
2670 btrfs_defrag_file(file
);
2677 long btrfs_ioctl(struct file
*file
, unsigned int
2678 cmd
, unsigned long arg
)
2680 struct btrfs_root
*root
= BTRFS_I(fdentry(file
)->d_inode
)->root
;
2683 case BTRFS_IOC_SNAP_CREATE
:
2684 return btrfs_ioctl_snap_create(root
, (void __user
*)arg
);
2685 case BTRFS_IOC_DEFRAG
:
2686 return btrfs_ioctl_defrag(file
);
2687 case BTRFS_IOC_RESIZE
:
2688 return btrfs_ioctl_resize(root
, (void __user
*)arg
);
2695 * Called inside transaction, so use GFP_NOFS
2697 struct inode
*btrfs_alloc_inode(struct super_block
*sb
)
2699 struct btrfs_inode
*ei
;
2701 ei
= kmem_cache_alloc(btrfs_inode_cachep
, GFP_NOFS
);
2705 ei
->ordered_trans
= 0;
2706 return &ei
->vfs_inode
;
2709 void btrfs_destroy_inode(struct inode
*inode
)
2711 WARN_ON(!list_empty(&inode
->i_dentry
));
2712 WARN_ON(inode
->i_data
.nrpages
);
2714 btrfs_drop_extent_cache(inode
, 0, (u64
)-1);
2715 kmem_cache_free(btrfs_inode_cachep
, BTRFS_I(inode
));
2718 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2719 static void init_once(struct kmem_cache
* cachep
, void *foo
)
2721 static void init_once(void * foo
, struct kmem_cache
* cachep
,
2722 unsigned long flags
)
2725 struct btrfs_inode
*ei
= (struct btrfs_inode
*) foo
;
2727 inode_init_once(&ei
->vfs_inode
);
2730 void btrfs_destroy_cachep(void)
2732 if (btrfs_inode_cachep
)
2733 kmem_cache_destroy(btrfs_inode_cachep
);
2734 if (btrfs_trans_handle_cachep
)
2735 kmem_cache_destroy(btrfs_trans_handle_cachep
);
2736 if (btrfs_transaction_cachep
)
2737 kmem_cache_destroy(btrfs_transaction_cachep
);
2738 if (btrfs_bit_radix_cachep
)
2739 kmem_cache_destroy(btrfs_bit_radix_cachep
);
2740 if (btrfs_path_cachep
)
2741 kmem_cache_destroy(btrfs_path_cachep
);
2744 struct kmem_cache
*btrfs_cache_create(const char *name
, size_t size
,
2745 unsigned long extra_flags
,
2746 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,23)
2747 void (*ctor
)(struct kmem_cache
*, void *)
2749 void (*ctor
)(void *, struct kmem_cache
*,
2754 return kmem_cache_create(name
, size
, 0, (SLAB_RECLAIM_ACCOUNT
|
2755 SLAB_MEM_SPREAD
| extra_flags
), ctor
2756 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
2762 int btrfs_init_cachep(void)
2764 btrfs_inode_cachep
= btrfs_cache_create("btrfs_inode_cache",
2765 sizeof(struct btrfs_inode
),
2767 if (!btrfs_inode_cachep
)
2769 btrfs_trans_handle_cachep
=
2770 btrfs_cache_create("btrfs_trans_handle_cache",
2771 sizeof(struct btrfs_trans_handle
),
2773 if (!btrfs_trans_handle_cachep
)
2775 btrfs_transaction_cachep
= btrfs_cache_create("btrfs_transaction_cache",
2776 sizeof(struct btrfs_transaction
),
2778 if (!btrfs_transaction_cachep
)
2780 btrfs_path_cachep
= btrfs_cache_create("btrfs_path_cache",
2781 sizeof(struct btrfs_path
),
2783 if (!btrfs_path_cachep
)
2785 btrfs_bit_radix_cachep
= btrfs_cache_create("btrfs_radix", 256,
2786 SLAB_DESTROY_BY_RCU
, NULL
);
2787 if (!btrfs_bit_radix_cachep
)
2791 btrfs_destroy_cachep();
2795 static int btrfs_getattr(struct vfsmount
*mnt
,
2796 struct dentry
*dentry
, struct kstat
*stat
)
2798 struct inode
*inode
= dentry
->d_inode
;
2799 generic_fillattr(inode
, stat
);
2800 stat
->blksize
= PAGE_CACHE_SIZE
;
2804 static int btrfs_rename(struct inode
* old_dir
, struct dentry
*old_dentry
,
2805 struct inode
* new_dir
,struct dentry
*new_dentry
)
2807 struct btrfs_trans_handle
*trans
;
2808 struct btrfs_root
*root
= BTRFS_I(old_dir
)->root
;
2809 struct inode
*new_inode
= new_dentry
->d_inode
;
2810 struct inode
*old_inode
= old_dentry
->d_inode
;
2811 struct timespec ctime
= CURRENT_TIME
;
2812 struct btrfs_path
*path
;
2815 if (S_ISDIR(old_inode
->i_mode
) && new_inode
&&
2816 new_inode
->i_size
> BTRFS_EMPTY_DIR_SIZE
) {
2820 mutex_lock(&root
->fs_info
->fs_mutex
);
2821 ret
= btrfs_check_free_space(root
, 1, 0);
2825 trans
= btrfs_start_transaction(root
, 1);
2827 btrfs_set_trans_block_group(trans
, new_dir
);
2828 path
= btrfs_alloc_path();
2834 old_dentry
->d_inode
->i_nlink
++;
2835 old_dir
->i_ctime
= old_dir
->i_mtime
= ctime
;
2836 new_dir
->i_ctime
= new_dir
->i_mtime
= ctime
;
2837 old_inode
->i_ctime
= ctime
;
2839 ret
= btrfs_unlink_trans(trans
, root
, old_dir
, old_dentry
);
2844 new_inode
->i_ctime
= CURRENT_TIME
;
2845 ret
= btrfs_unlink_trans(trans
, root
, new_dir
, new_dentry
);
2849 ret
= btrfs_add_link(trans
, new_dentry
, old_inode
, 1);
2854 btrfs_free_path(path
);
2855 btrfs_end_transaction(trans
, root
);
2857 mutex_unlock(&root
->fs_info
->fs_mutex
);
2861 static int btrfs_symlink(struct inode
*dir
, struct dentry
*dentry
,
2862 const char *symname
)
2864 struct btrfs_trans_handle
*trans
;
2865 struct btrfs_root
*root
= BTRFS_I(dir
)->root
;
2866 struct btrfs_path
*path
;
2867 struct btrfs_key key
;
2868 struct inode
*inode
= NULL
;
2875 struct btrfs_file_extent_item
*ei
;
2876 struct extent_buffer
*leaf
;
2877 unsigned long nr
= 0;
2879 name_len
= strlen(symname
) + 1;
2880 if (name_len
> BTRFS_MAX_INLINE_DATA_SIZE(root
))
2881 return -ENAMETOOLONG
;
2883 mutex_lock(&root
->fs_info
->fs_mutex
);
2884 err
= btrfs_check_free_space(root
, 1, 0);
2888 trans
= btrfs_start_transaction(root
, 1);
2889 btrfs_set_trans_block_group(trans
, dir
);
2891 err
= btrfs_find_free_objectid(trans
, root
, dir
->i_ino
, &objectid
);
2897 inode
= btrfs_new_inode(trans
, root
, dentry
->d_name
.name
,
2899 dentry
->d_parent
->d_inode
->i_ino
, objectid
,
2900 BTRFS_I(dir
)->block_group
, S_IFLNK
|S_IRWXUGO
);
2901 err
= PTR_ERR(inode
);
2905 btrfs_set_trans_block_group(trans
, inode
);
2906 err
= btrfs_add_nondir(trans
, dentry
, inode
, 0);
2910 inode
->i_mapping
->a_ops
= &btrfs_aops
;
2911 inode
->i_fop
= &btrfs_file_operations
;
2912 inode
->i_op
= &btrfs_file_inode_operations
;
2913 extent_map_tree_init(&BTRFS_I(inode
)->extent_tree
, GFP_NOFS
);
2914 extent_io_tree_init(&BTRFS_I(inode
)->io_tree
,
2915 inode
->i_mapping
, GFP_NOFS
);
2916 BTRFS_I(inode
)->io_tree
.ops
= &btrfs_extent_io_ops
;
2918 dir
->i_sb
->s_dirt
= 1;
2919 btrfs_update_inode_block_group(trans
, inode
);
2920 btrfs_update_inode_block_group(trans
, dir
);
2924 path
= btrfs_alloc_path();
2926 key
.objectid
= inode
->i_ino
;
2928 btrfs_set_key_type(&key
, BTRFS_EXTENT_DATA_KEY
);
2929 datasize
= btrfs_file_extent_calc_inline_size(name_len
);
2930 err
= btrfs_insert_empty_item(trans
, root
, path
, &key
,
2936 leaf
= path
->nodes
[0];
2937 ei
= btrfs_item_ptr(leaf
, path
->slots
[0],
2938 struct btrfs_file_extent_item
);
2939 btrfs_set_file_extent_generation(leaf
, ei
, trans
->transid
);
2940 btrfs_set_file_extent_type(leaf
, ei
,
2941 BTRFS_FILE_EXTENT_INLINE
);
2942 ptr
= btrfs_file_extent_inline_start(ei
);
2943 write_extent_buffer(leaf
, symname
, ptr
, name_len
);
2944 btrfs_mark_buffer_dirty(leaf
);
2945 btrfs_free_path(path
);
2947 inode
->i_op
= &btrfs_symlink_inode_operations
;
2948 inode
->i_mapping
->a_ops
= &btrfs_symlink_aops
;
2949 inode
->i_size
= name_len
- 1;
2950 err
= btrfs_update_inode(trans
, root
, inode
);
2955 nr
= trans
->blocks_used
;
2956 btrfs_end_transaction(trans
, root
);
2958 mutex_unlock(&root
->fs_info
->fs_mutex
);
2960 inode_dec_link_count(inode
);
2963 btrfs_btree_balance_dirty(root
, nr
);
2964 btrfs_throttle(root
);
2967 static int btrfs_permission(struct inode
*inode
, int mask
,
2968 struct nameidata
*nd
)
2970 if (btrfs_test_flag(inode
, READONLY
) && (mask
& MAY_WRITE
))
2972 return generic_permission(inode
, mask
, NULL
);
2975 static struct inode_operations btrfs_dir_inode_operations
= {
2976 .lookup
= btrfs_lookup
,
2977 .create
= btrfs_create
,
2978 .unlink
= btrfs_unlink
,
2980 .mkdir
= btrfs_mkdir
,
2981 .rmdir
= btrfs_rmdir
,
2982 .rename
= btrfs_rename
,
2983 .symlink
= btrfs_symlink
,
2984 .setattr
= btrfs_setattr
,
2985 .mknod
= btrfs_mknod
,
2986 .setxattr
= generic_setxattr
,
2987 .getxattr
= generic_getxattr
,
2988 .listxattr
= btrfs_listxattr
,
2989 .removexattr
= generic_removexattr
,
2990 .permission
= btrfs_permission
,
2992 static struct inode_operations btrfs_dir_ro_inode_operations
= {
2993 .lookup
= btrfs_lookup
,
2994 .permission
= btrfs_permission
,
2996 static struct file_operations btrfs_dir_file_operations
= {
2997 .llseek
= generic_file_llseek
,
2998 .read
= generic_read_dir
,
2999 .readdir
= btrfs_readdir
,
3000 .unlocked_ioctl
= btrfs_ioctl
,
3001 #ifdef CONFIG_COMPAT
3002 .compat_ioctl
= btrfs_ioctl
,
3006 static struct extent_io_ops btrfs_extent_io_ops
= {
3007 .fill_delalloc
= run_delalloc_range
,
3008 .writepage_io_hook
= btrfs_writepage_io_hook
,
3009 .readpage_io_hook
= btrfs_readpage_io_hook
,
3010 .readpage_end_io_hook
= btrfs_readpage_end_io_hook
,
3011 .set_bit_hook
= btrfs_set_bit_hook
,
3012 .clear_bit_hook
= btrfs_clear_bit_hook
,
3015 static struct address_space_operations btrfs_aops
= {
3016 .readpage
= btrfs_readpage
,
3017 .writepage
= btrfs_writepage
,
3018 .writepages
= btrfs_writepages
,
3019 .readpages
= btrfs_readpages
,
3020 .sync_page
= block_sync_page
,
3022 .invalidatepage
= btrfs_invalidatepage
,
3023 .releasepage
= btrfs_releasepage
,
3024 .set_page_dirty
= __set_page_dirty_nobuffers
,
3027 static struct address_space_operations btrfs_symlink_aops
= {
3028 .readpage
= btrfs_readpage
,
3029 .writepage
= btrfs_writepage
,
3030 .invalidatepage
= btrfs_invalidatepage
,
3031 .releasepage
= btrfs_releasepage
,
3034 static struct inode_operations btrfs_file_inode_operations
= {
3035 .truncate
= btrfs_truncate
,
3036 .getattr
= btrfs_getattr
,
3037 .setattr
= btrfs_setattr
,
3038 .setxattr
= generic_setxattr
,
3039 .getxattr
= generic_getxattr
,
3040 .listxattr
= btrfs_listxattr
,
3041 .removexattr
= generic_removexattr
,
3042 .permission
= btrfs_permission
,
3044 static struct inode_operations btrfs_special_inode_operations
= {
3045 .getattr
= btrfs_getattr
,
3046 .setattr
= btrfs_setattr
,
3047 .permission
= btrfs_permission
,
3049 static struct inode_operations btrfs_symlink_inode_operations
= {
3050 .readlink
= generic_readlink
,
3051 .follow_link
= page_follow_link_light
,
3052 .put_link
= page_put_link
,
3053 .permission
= btrfs_permission
,