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.
23 #include <linux/buffer_head.h>
24 #include <linux/workqueue.h>
25 #include "bit-radix.h"
27 struct btrfs_trans_handle
;
28 struct btrfs_transaction
;
29 extern struct kmem_cache
*btrfs_trans_handle_cachep
;
30 extern struct kmem_cache
*btrfs_transaction_cachep
;
31 extern struct kmem_cache
*btrfs_bit_radix_cachep
;
32 extern struct kmem_cache
*btrfs_path_cachep
;
34 #define BTRFS_MAGIC "_BtRfS_M"
36 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
37 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
38 #define BTRFS_FS_TREE_OBJECTID 3ULL
39 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
40 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
43 * we can actually store much bigger names, but lets not confuse the rest
46 #define BTRFS_NAME_LEN 255
48 /* 32 bytes in various csum fields */
49 #define BTRFS_CSUM_SIZE 32
50 /* four bytes for CRC32 */
51 #define BTRFS_CRC32_SIZE 4
52 #define BTRFS_EMPTY_DIR_SIZE 6
54 #define BTRFS_FT_UNKNOWN 0
55 #define BTRFS_FT_REG_FILE 1
56 #define BTRFS_FT_DIR 2
57 #define BTRFS_FT_CHRDEV 3
58 #define BTRFS_FT_BLKDEV 4
59 #define BTRFS_FT_FIFO 5
60 #define BTRFS_FT_SOCK 6
61 #define BTRFS_FT_SYMLINK 7
62 #define BTRFS_FT_MAX 8
65 * the key defines the order in the tree, and so it also defines (optimal)
66 * block layout. objectid corresonds to the inode number. The flags
67 * tells us things about the object, and is a kind of stream selector.
68 * so for a given inode, keys with flags of 1 might refer to the inode
69 * data, flags of 2 may point to file data in the btree and flags == 3
70 * may point to extents.
72 * offset is the starting byte offset for this key in the stream.
74 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
75 * in cpu native order. Otherwise they are identical and their sizes
76 * should be the same (ie both packed)
78 struct btrfs_disk_key
{
82 } __attribute__ ((__packed__
));
88 } __attribute__ ((__packed__
));
91 * every tree block (leaf or node) starts with this header.
94 u8 csum
[BTRFS_CSUM_SIZE
];
95 u8 fsid
[16]; /* FS specific uuid */
96 __le64 blocknr
; /* which block this node is supposed to live in */
102 } __attribute__ ((__packed__
));
104 #define BTRFS_MAX_LEVEL 8
105 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
106 sizeof(struct btrfs_header)) / \
107 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
108 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
109 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
110 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
111 sizeof(struct btrfs_item) - \
112 sizeof(struct btrfs_file_extent_item))
116 * the super block basically lists the main trees of the FS
117 * it currently lacks any block count etc etc
119 struct btrfs_super_block
{
120 u8 csum
[BTRFS_CSUM_SIZE
];
121 /* the first 3 fields must match struct btrfs_header */
122 u8 fsid
[16]; /* FS specific uuid */
123 __le64 blocknr
; /* this block number */
130 __le64 root_dir_objectid
;
131 } __attribute__ ((__packed__
));
134 * A leaf is full of items. offset and size tell us where to find
135 * the item in the leaf (relative to the start of the data area)
138 struct btrfs_disk_key key
;
141 } __attribute__ ((__packed__
));
144 * leaves have an item area and a data area:
145 * [item0, item1....itemN] [free space] [dataN...data1, data0]
147 * The data is separate from the items to get the keys closer together
151 struct btrfs_header header
;
152 struct btrfs_item items
[];
153 } __attribute__ ((__packed__
));
156 * all non-leaf blocks are nodes, they hold only keys and pointers to
159 struct btrfs_key_ptr
{
160 struct btrfs_disk_key key
;
162 } __attribute__ ((__packed__
));
165 struct btrfs_header header
;
166 struct btrfs_key_ptr ptrs
[];
167 } __attribute__ ((__packed__
));
170 * btrfs_paths remember the path taken from the root down to the leaf.
171 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
172 * to any other levels that are present.
174 * The slots array records the index of the item or block pointer
175 * used while walking the tree.
178 struct buffer_head
*nodes
[BTRFS_MAX_LEVEL
];
179 int slots
[BTRFS_MAX_LEVEL
];
183 * items in the extent btree are used to record the objectid of the
184 * owner of the block and the number of references
186 struct btrfs_extent_item
{
189 } __attribute__ ((__packed__
));
191 struct btrfs_inode_timespec
{
194 } __attribute__ ((__packed__
));
197 * there is no padding here on purpose. If you want to extent the inode,
198 * make a new item type
200 struct btrfs_inode_item
{
212 struct btrfs_inode_timespec atime
;
213 struct btrfs_inode_timespec ctime
;
214 struct btrfs_inode_timespec mtime
;
215 struct btrfs_inode_timespec otime
;
216 } __attribute__ ((__packed__
));
218 struct btrfs_dir_item
{
219 struct btrfs_disk_key location
;
223 } __attribute__ ((__packed__
));
225 struct btrfs_root_item
{
226 struct btrfs_inode_item inode
;
233 } __attribute__ ((__packed__
));
235 #define BTRFS_FILE_EXTENT_REG 0
236 #define BTRFS_FILE_EXTENT_INLINE 1
238 struct btrfs_file_extent_item
{
242 * disk space consumed by the extent, checksum blocks are included
246 __le64 disk_num_blocks
;
248 * the logical offset in file blocks (no csums)
249 * this extent record is for. This allows a file extent to point
250 * into the middle of an existing extent on disk, sharing it
251 * between two snapshots (useful if some bytes in the middle of the
252 * extent have changed
256 * the logical number of file blocks (no csums included)
259 } __attribute__ ((__packed__
));
261 struct btrfs_csum_item
{
263 } __attribute__ ((__packed__
));
265 /* tag for the radix tree of block groups in ram */
266 #define BTRFS_BLOCK_GROUP_DIRTY 0
267 #define BTRFS_BLOCK_GROUP_AVAIL 1
268 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
271 #define BTRFS_BLOCK_GROUP_DATA 1
272 struct btrfs_block_group_item
{
275 } __attribute__ ((__packed__
));
277 struct btrfs_block_group_cache
{
278 struct btrfs_key key
;
279 struct btrfs_block_group_item item
;
280 struct radix_tree_root
*radix
;
289 struct btrfs_fs_info
{
290 struct btrfs_root
*extent_root
;
291 struct btrfs_root
*tree_root
;
292 struct radix_tree_root fs_roots_radix
;
293 struct radix_tree_root pending_del_radix
;
294 struct radix_tree_root pinned_radix
;
295 struct radix_tree_root block_group_radix
;
296 struct radix_tree_root block_group_data_radix
;
297 struct radix_tree_root extent_map_radix
;
299 u64 extent_tree_insert
[BTRFS_MAX_LEVEL
* 3];
300 int extent_tree_insert_nr
;
301 u64 extent_tree_prealloc
[BTRFS_MAX_LEVEL
* 3];
302 int extent_tree_prealloc_nr
;
305 struct btrfs_transaction
*running_transaction
;
306 struct btrfs_super_block
*disk_super
;
307 struct buffer_head
*sb_buffer
;
308 struct super_block
*sb
;
309 struct inode
*btree_inode
;
310 struct mutex trans_mutex
;
311 struct mutex fs_mutex
;
312 struct list_head trans_list
;
313 struct list_head dead_roots
;
314 struct delayed_work trans_work
;
320 * in ram representation of the tree. extent_root is used for all allocations
321 * and for the extent tree extent_root root.
324 struct buffer_head
*node
;
325 struct buffer_head
*commit_root
;
326 struct btrfs_root_item root_item
;
327 struct btrfs_key root_key
;
328 struct btrfs_fs_info
*fs_info
;
336 u64 last_inode_alloc
;
339 /* the lower bits in the key flags defines the item type */
340 #define BTRFS_KEY_TYPE_MAX 256
341 #define BTRFS_KEY_TYPE_SHIFT 24
342 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
343 BTRFS_KEY_TYPE_SHIFT)
346 * inode items have the data typically returned from stat and store other
347 * info about object characteristics. There is one for every file and dir in
350 #define BTRFS_INODE_ITEM_KEY 1
352 /* reserve 2-15 close to the inode for later flexibility */
355 * dir items are the name -> inode pointers in a directory. There is one
356 * for every name in a directory.
358 #define BTRFS_DIR_ITEM_KEY 16
359 #define BTRFS_DIR_INDEX_KEY 17
361 * extent data is for file data
363 #define BTRFS_EXTENT_DATA_KEY 18
365 * csum items have the checksums for data in the extents
367 #define BTRFS_CSUM_ITEM_KEY 19
369 /* reserve 20-31 for other file stuff */
372 * root items point to tree roots. There are typically in the root
373 * tree used by the super block to find all the other trees
375 #define BTRFS_ROOT_ITEM_KEY 32
377 * extent items are in the extent map tree. These record which blocks
378 * are used, and how many references there are to each block
380 #define BTRFS_EXTENT_ITEM_KEY 33
383 * block groups give us hints into the extent allocation trees. Which
384 * blocks are free etc etc
386 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
389 * string items are for debugging. They just store a short string of
392 #define BTRFS_STRING_ITEM_KEY 253
395 static inline u64
btrfs_block_group_used(struct btrfs_block_group_item
*bi
)
397 return le64_to_cpu(bi
->used
);
400 static inline void btrfs_set_block_group_used(struct
401 btrfs_block_group_item
*bi
,
404 bi
->used
= cpu_to_le64(val
);
407 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
409 return le64_to_cpu(i
->generation
);
412 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
415 i
->generation
= cpu_to_le64(val
);
418 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
420 return le64_to_cpu(i
->size
);
423 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
425 i
->size
= cpu_to_le64(val
);
428 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
430 return le64_to_cpu(i
->nblocks
);
433 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
435 i
->nblocks
= cpu_to_le64(val
);
438 static inline u64
btrfs_inode_block_group(struct btrfs_inode_item
*i
)
440 return le64_to_cpu(i
->block_group
);
443 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item
*i
,
446 i
->block_group
= cpu_to_le64(val
);
449 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
451 return le32_to_cpu(i
->nlink
);
454 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
456 i
->nlink
= cpu_to_le32(val
);
459 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
461 return le32_to_cpu(i
->uid
);
464 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
466 i
->uid
= cpu_to_le32(val
);
469 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
471 return le32_to_cpu(i
->gid
);
474 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
476 i
->gid
= cpu_to_le32(val
);
479 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
481 return le32_to_cpu(i
->mode
);
484 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
486 i
->mode
= cpu_to_le32(val
);
489 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
491 return le32_to_cpu(i
->rdev
);
494 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
496 i
->rdev
= cpu_to_le32(val
);
499 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
501 return le16_to_cpu(i
->flags
);
504 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
506 i
->flags
= cpu_to_le16(val
);
509 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
511 return le16_to_cpu(i
->compat_flags
);
514 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
517 i
->compat_flags
= cpu_to_le16(val
);
520 static inline u64
btrfs_timespec_sec(struct btrfs_inode_timespec
*ts
)
522 return le64_to_cpu(ts
->sec
);
525 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec
*ts
,
528 ts
->sec
= cpu_to_le64(val
);
531 static inline u32
btrfs_timespec_nsec(struct btrfs_inode_timespec
*ts
)
533 return le32_to_cpu(ts
->nsec
);
536 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec
*ts
,
539 ts
->nsec
= cpu_to_le32(val
);
542 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
544 return le32_to_cpu(ei
->refs
);
547 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
549 ei
->refs
= cpu_to_le32(val
);
552 static inline u64
btrfs_extent_owner(struct btrfs_extent_item
*ei
)
554 return le64_to_cpu(ei
->owner
);
557 static inline void btrfs_set_extent_owner(struct btrfs_extent_item
*ei
, u64 val
)
559 ei
->owner
= cpu_to_le64(val
);
562 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
564 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
568 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
571 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
574 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
576 return le32_to_cpu(item
->offset
);
579 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
581 item
->offset
= cpu_to_le32(val
);
584 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
586 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
589 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
591 return le16_to_cpu(item
->size
);
594 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
596 item
->size
= cpu_to_le16(val
);
599 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
601 return le16_to_cpu(d
->flags
);
604 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
606 d
->flags
= cpu_to_le16(val
);
609 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
614 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
619 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
621 return le16_to_cpu(d
->name_len
);
624 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
626 d
->name_len
= cpu_to_le16(val
);
629 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
630 struct btrfs_disk_key
*disk
)
632 cpu
->offset
= le64_to_cpu(disk
->offset
);
633 cpu
->flags
= le32_to_cpu(disk
->flags
);
634 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
637 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
638 struct btrfs_key
*cpu
)
640 disk
->offset
= cpu_to_le64(cpu
->offset
);
641 disk
->flags
= cpu_to_le32(cpu
->flags
);
642 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
645 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
647 return le64_to_cpu(disk
->objectid
);
650 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
653 disk
->objectid
= cpu_to_le64(val
);
656 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
658 return le64_to_cpu(disk
->offset
);
661 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
664 disk
->offset
= cpu_to_le64(val
);
667 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
669 return le32_to_cpu(disk
->flags
);
672 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
675 disk
->flags
= cpu_to_le32(val
);
678 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
680 return le32_to_cpu(key
->flags
) >> BTRFS_KEY_TYPE_SHIFT
;
683 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
,
686 u32 flags
= btrfs_disk_key_flags(key
);
687 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
688 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
689 flags
= (flags
& ~BTRFS_KEY_TYPE_MASK
) | val
;
690 btrfs_set_disk_key_flags(key
, flags
);
693 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
695 return key
->flags
>> BTRFS_KEY_TYPE_SHIFT
;
698 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 val
)
700 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
701 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
702 key
->flags
= (key
->flags
& ~(BTRFS_KEY_TYPE_MASK
)) | val
;
705 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
707 return le64_to_cpu(h
->blocknr
);
710 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
712 h
->blocknr
= cpu_to_le64(blocknr
);
715 static inline u64
btrfs_header_generation(struct btrfs_header
*h
)
717 return le64_to_cpu(h
->generation
);
720 static inline void btrfs_set_header_generation(struct btrfs_header
*h
,
723 h
->generation
= cpu_to_le64(val
);
726 static inline u64
btrfs_header_owner(struct btrfs_header
*h
)
728 return le64_to_cpu(h
->owner
);
731 static inline void btrfs_set_header_owner(struct btrfs_header
*h
,
734 h
->owner
= cpu_to_le64(val
);
737 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
739 return le16_to_cpu(h
->nritems
);
742 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
744 h
->nritems
= cpu_to_le16(val
);
747 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
749 return le16_to_cpu(h
->flags
);
752 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
754 h
->flags
= cpu_to_le16(val
);
757 static inline int btrfs_header_level(struct btrfs_header
*h
)
762 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
764 BUG_ON(level
> BTRFS_MAX_LEVEL
);
768 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
770 return (btrfs_header_level(&n
->header
) == 0);
773 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
775 return le64_to_cpu(item
->blocknr
);
778 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
780 item
->blocknr
= cpu_to_le64(val
);
783 static inline u64
btrfs_root_dirid(struct btrfs_root_item
*item
)
785 return le64_to_cpu(item
->root_dirid
);
788 static inline void btrfs_set_root_dirid(struct btrfs_root_item
*item
, u64 val
)
790 item
->root_dirid
= cpu_to_le64(val
);
793 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
795 return le32_to_cpu(item
->refs
);
798 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
800 item
->refs
= cpu_to_le32(val
);
803 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
805 return le64_to_cpu(s
->blocknr
);
808 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
810 s
->blocknr
= cpu_to_le64(val
);
813 static inline u64
btrfs_super_generation(struct btrfs_super_block
*s
)
815 return le64_to_cpu(s
->generation
);
818 static inline void btrfs_set_super_generation(struct btrfs_super_block
*s
,
821 s
->generation
= cpu_to_le64(val
);
824 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
826 return le64_to_cpu(s
->root
);
829 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
831 s
->root
= cpu_to_le64(val
);
834 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
836 return le64_to_cpu(s
->total_blocks
);
839 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
842 s
->total_blocks
= cpu_to_le64(val
);
845 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
847 return le64_to_cpu(s
->blocks_used
);
850 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
853 s
->blocks_used
= cpu_to_le64(val
);
856 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
858 return le32_to_cpu(s
->blocksize
);
861 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
864 s
->blocksize
= cpu_to_le32(val
);
867 static inline u64
btrfs_super_root_dir(struct btrfs_super_block
*s
)
869 return le64_to_cpu(s
->root_dir_objectid
);
872 static inline void btrfs_set_super_root_dir(struct btrfs_super_block
*s
, u64
875 s
->root_dir_objectid
= cpu_to_le64(val
);
878 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
880 return (u8
*)l
->items
;
883 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item
*e
)
887 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item
*e
,
893 static inline char *btrfs_file_extent_inline_start(struct
894 btrfs_file_extent_item
*e
)
896 return (char *)(&e
->disk_blocknr
);
899 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
901 return (unsigned long)(&((struct
902 btrfs_file_extent_item
*)NULL
)->disk_blocknr
) + datasize
;
905 static inline u32
btrfs_file_extent_inline_len(struct btrfs_item
*e
)
907 struct btrfs_file_extent_item
*fe
= NULL
;
908 return btrfs_item_size(e
) - (unsigned long)(&fe
->disk_blocknr
);
911 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
914 return le64_to_cpu(e
->disk_blocknr
);
917 static inline void btrfs_set_file_extent_disk_blocknr(struct
918 btrfs_file_extent_item
921 e
->disk_blocknr
= cpu_to_le64(val
);
924 static inline u64
btrfs_file_extent_generation(struct btrfs_file_extent_item
*e
)
926 return le64_to_cpu(e
->generation
);
929 static inline void btrfs_set_file_extent_generation(struct
930 btrfs_file_extent_item
*e
,
933 e
->generation
= cpu_to_le64(val
);
936 static inline u64
btrfs_file_extent_disk_num_blocks(struct
937 btrfs_file_extent_item
*e
)
939 return le64_to_cpu(e
->disk_num_blocks
);
942 static inline void btrfs_set_file_extent_disk_num_blocks(struct
943 btrfs_file_extent_item
946 e
->disk_num_blocks
= cpu_to_le64(val
);
949 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
951 return le64_to_cpu(e
->offset
);
954 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
957 e
->offset
= cpu_to_le64(val
);
960 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
963 return le64_to_cpu(e
->num_blocks
);
966 static inline void btrfs_set_file_extent_num_blocks(struct
967 btrfs_file_extent_item
*e
,
970 e
->num_blocks
= cpu_to_le64(val
);
973 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
975 return sb
->s_fs_info
;
978 static inline void btrfs_check_bounds(void *vptr
, size_t len
,
979 void *vcontainer
, size_t container_len
)
982 char *container
= vcontainer
;
983 WARN_ON(ptr
< container
);
984 WARN_ON(ptr
+ len
> container
+ container_len
);
987 static inline void btrfs_memcpy(struct btrfs_root
*root
,
989 void *dst
, const void *src
, size_t nr
)
991 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
992 memcpy(dst
, src
, nr
);
995 static inline void btrfs_memmove(struct btrfs_root
*root
,
997 void *dst
, void *src
, size_t nr
)
999 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
1000 memmove(dst
, src
, nr
);
1003 static inline void btrfs_mark_buffer_dirty(struct buffer_head
*bh
)
1005 WARN_ON(!atomic_read(&bh
->b_count
));
1006 mark_buffer_dirty(bh
);
1009 /* helper function to cast into the data area of the leaf. */
1010 #define btrfs_item_ptr(leaf, slot, type) \
1011 ((type *)(btrfs_leaf_data(leaf) + \
1012 btrfs_item_offset((leaf)->items + (slot))))
1015 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
1016 btrfs_fs_info
*info
,
1018 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
1019 struct btrfs_block_group_cache
1020 *hint
, u64 search_start
,
1021 int data
, int owner
);
1022 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
1023 struct btrfs_root
*root
);
1024 struct buffer_head
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
1025 struct btrfs_root
*root
, u64 hint
);
1026 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
1027 struct btrfs_root
*root
, u64 owner
,
1028 u64 num_blocks
, u64 search_start
,
1029 u64 search_end
, struct btrfs_key
*ins
, int data
);
1030 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1031 struct buffer_head
*buf
);
1032 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
1033 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
1034 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
, struct
1036 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1037 struct btrfs_root
*root
,
1038 u64 blocknr
, u64 num_blocks
);
1039 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
1040 struct btrfs_root
*root
);
1041 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
1042 int btrfs_read_block_groups(struct btrfs_root
*root
);
1044 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1045 *root
, struct btrfs_path
*path
, u32 data_size
);
1046 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
1047 struct btrfs_root
*root
,
1048 struct btrfs_path
*path
,
1050 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1051 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
1053 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
1054 struct btrfs_path
*btrfs_alloc_path(void);
1055 void btrfs_free_path(struct btrfs_path
*p
);
1056 void btrfs_init_path(struct btrfs_path
*p
);
1057 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1058 struct btrfs_path
*path
);
1059 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1060 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1061 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1062 *root
, struct btrfs_path
*path
, struct btrfs_key
1063 *cpu_key
, u32 data_size
);
1064 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1065 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
1066 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1067 *root
, struct buffer_head
*snap
);
1069 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1070 struct btrfs_key
*key
);
1071 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1072 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1074 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1075 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1077 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1078 btrfs_root_item
*item
, struct btrfs_key
*key
);
1080 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1081 *root
, const char *name
, int name_len
, u64 dir
,
1082 struct btrfs_key
*location
, u8 type
);
1083 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1084 struct btrfs_root
*root
,
1085 struct btrfs_path
*path
, u64 dir
,
1086 const char *name
, int name_len
,
1088 struct btrfs_dir_item
*
1089 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1090 struct btrfs_root
*root
,
1091 struct btrfs_path
*path
, u64 dir
,
1092 u64 objectid
, const char *name
, int name_len
,
1094 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1095 struct btrfs_path
*path
,
1096 const char *name
, int name_len
);
1097 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1098 struct btrfs_root
*root
,
1099 struct btrfs_path
*path
,
1100 struct btrfs_dir_item
*di
);
1102 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1103 struct btrfs_root
*fs_root
,
1104 u64 dirid
, u64
*objectid
);
1105 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1108 int btrfs_insert_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1109 *root
, u64 objectid
, struct btrfs_inode_item
1111 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1112 *root
, struct btrfs_path
*path
,
1113 struct btrfs_key
*location
, int mod
);
1116 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1117 struct btrfs_root
*root
,
1118 u64 objectid
, u64 pos
, u64 offset
,
1119 u64 disk_num_blocks
,
1121 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1122 struct btrfs_root
*root
,
1123 struct btrfs_path
*path
, u64 objectid
,
1124 u64 blocknr
, int mod
);
1125 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1126 struct btrfs_root
*root
,
1127 u64 objectid
, u64 offset
,
1128 char *data
, size_t len
);
1129 int btrfs_csum_verify_file_block(struct btrfs_root
*root
,
1130 u64 objectid
, u64 offset
,
1131 char *data
, size_t len
);
1132 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1133 struct btrfs_root
*root
,
1134 struct btrfs_path
*path
,
1135 u64 objectid
, u64 offset
,
1137 int btrfs_csum_truncate(struct btrfs_trans_handle
*trans
,
1138 struct btrfs_root
*root
, struct btrfs_path
*path
,
1141 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1142 int btrfs_readpage(struct file
*file
, struct page
*page
);
1143 void btrfs_delete_inode(struct inode
*inode
);
1144 void btrfs_read_locked_inode(struct inode
*inode
);
1145 int btrfs_write_inode(struct inode
*inode
, int wait
);
1146 void btrfs_dirty_inode(struct inode
*inode
);
1147 struct inode
*btrfs_alloc_inode(struct super_block
*sb
);
1148 void btrfs_destroy_inode(struct inode
*inode
);
1149 int btrfs_init_cachep(void);
1150 void btrfs_destroy_cachep(void);
1151 int btrfs_ioctl(struct inode
*inode
, struct file
*filp
, unsigned int cmd
,
1153 long btrfs_compat_ioctl(struct file
*file
, unsigned int cmd
,
1155 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1156 struct btrfs_root
*root
);
1157 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1158 unsigned from
, unsigned to
);
1159 int btrfs_get_block(struct inode
*inode
, sector_t iblock
,
1160 struct buffer_head
*result
, int create
);
1162 extern struct file_operations btrfs_file_operations
;
1163 int btrfs_drop_extents(struct btrfs_trans_handle
*trans
,
1164 struct btrfs_root
*root
, struct inode
*inode
,
1165 u64 start
, u64 end
, u64
*hint_block
);