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 "kerncompat.h"
25 struct btrfs_trans_handle
;
27 #define BTRFS_MAGIC "_BtRfS_M"
29 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
30 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
31 #define BTRFS_FS_TREE_OBJECTID 3ULL
32 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
33 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
36 * we can actually store much bigger names, but lets not confuse the rest
39 #define BTRFS_NAME_LEN 255
41 /* 32 bytes in various csum fields */
42 #define BTRFS_CSUM_SIZE 32
43 /* four bytes for CRC32 */
44 #define BTRFS_CRC32_SIZE 4
46 #define BTRFS_FT_UNKNOWN 0
47 #define BTRFS_FT_REG_FILE 1
48 #define BTRFS_FT_DIR 2
49 #define BTRFS_FT_CHRDEV 3
50 #define BTRFS_FT_BLKDEV 4
51 #define BTRFS_FT_FIFO 5
52 #define BTRFS_FT_SOCK 6
53 #define BTRFS_FT_SYMLINK 7
54 #define BTRFS_FT_MAX 8
57 * the key defines the order in the tree, and so it also defines (optimal)
58 * block layout. objectid corresonds to the inode number. The flags
59 * tells us things about the object, and is a kind of stream selector.
60 * so for a given inode, keys with flags of 1 might refer to the inode
61 * data, flags of 2 may point to file data in the btree and flags == 3
62 * may point to extents.
64 * offset is the starting byte offset for this key in the stream.
66 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
67 * in cpu native order. Otherwise they are identical and their sizes
68 * should be the same (ie both packed)
70 struct btrfs_disk_key
{
74 } __attribute__ ((__packed__
));
80 } __attribute__ ((__packed__
));
83 * every tree block (leaf or node) starts with this header.
86 u8 csum
[BTRFS_CSUM_SIZE
];
87 u8 fsid
[16]; /* FS specific uuid */
88 __le64 blocknr
; /* which block this node is supposed to live in */
94 } __attribute__ ((__packed__
));
96 #define BTRFS_MAX_LEVEL 8
97 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
98 sizeof(struct btrfs_header)) / \
99 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
100 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
101 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
105 * the super block basically lists the main trees of the FS
106 * it currently lacks any block count etc etc
108 struct btrfs_super_block
{
109 u8 csum
[BTRFS_CSUM_SIZE
];
110 /* the first 3 fields must match struct btrfs_header */
111 u8 fsid
[16]; /* FS specific uuid */
112 __le64 blocknr
; /* this block number */
118 __le64 root_dir_objectid
;
120 } __attribute__ ((__packed__
));
123 * A leaf is full of items. offset and size tell us where to find
124 * the item in the leaf (relative to the start of the data area)
127 struct btrfs_disk_key key
;
130 } __attribute__ ((__packed__
));
133 * leaves have an item area and a data area:
134 * [item0, item1....itemN] [free space] [dataN...data1, data0]
136 * The data is separate from the items to get the keys closer together
140 struct btrfs_header header
;
141 struct btrfs_item items
[];
142 } __attribute__ ((__packed__
));
145 * all non-leaf blocks are nodes, they hold only keys and pointers to
148 struct btrfs_key_ptr
{
149 struct btrfs_disk_key key
;
151 } __attribute__ ((__packed__
));
154 struct btrfs_header header
;
155 struct btrfs_key_ptr ptrs
[];
156 } __attribute__ ((__packed__
));
159 * btrfs_paths remember the path taken from the root down to the leaf.
160 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
161 * to any other levels that are present.
163 * The slots array records the index of the item or block pointer
164 * used while walking the tree.
167 struct btrfs_buffer
*nodes
[BTRFS_MAX_LEVEL
];
168 int slots
[BTRFS_MAX_LEVEL
];
172 * items in the extent btree are used to record the objectid of the
173 * owner of the block and the number of references
175 struct btrfs_extent_item
{
178 } __attribute__ ((__packed__
));
180 struct btrfs_inode_timespec
{
183 } __attribute__ ((__packed__
));
186 * there is no padding here on purpose. If you want to extent the inode,
187 * make a new item type
189 struct btrfs_inode_item
{
201 struct btrfs_inode_timespec atime
;
202 struct btrfs_inode_timespec ctime
;
203 struct btrfs_inode_timespec mtime
;
204 struct btrfs_inode_timespec otime
;
205 } __attribute__ ((__packed__
));
207 /* inline data is just a blob of bytes */
208 struct btrfs_inline_data_item
{
210 } __attribute__ ((__packed__
));
212 struct btrfs_dir_item
{
213 struct btrfs_disk_key location
;
217 } __attribute__ ((__packed__
));
219 struct btrfs_root_item
{
220 struct btrfs_inode_item inode
;
227 struct btrfs_disk_key drop_progress
;
229 } __attribute__ ((__packed__
));
231 #define BTRFS_FILE_EXTENT_REG 0
232 #define BTRFS_FILE_EXTENT_INLINE 1
234 struct btrfs_file_extent_item
{
238 * disk space consumed by the extent, checksum blocks are included
242 __le64 disk_num_blocks
;
244 * the logical offset in file blocks (no csums)
245 * this extent record is for. This allows a file extent to point
246 * into the middle of an existing extent on disk, sharing it
247 * between two snapshots (useful if some bytes in the middle of the
248 * extent have changed
252 * the logical number of file blocks (no csums included)
255 } __attribute__ ((__packed__
));
257 struct btrfs_csum_item
{
258 u8 csum
[BTRFS_CSUM_SIZE
];
259 } __attribute__ ((__packed__
));
261 /* tag for the radix tree of block groups in ram */
262 #define BTRFS_BLOCK_GROUP_DIRTY 0
263 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
266 #define BTRFS_BLOCK_GROUP_DATA 1
267 struct btrfs_block_group_item
{
270 } __attribute__ ((__packed__
));
272 struct btrfs_block_group_cache
{
273 struct btrfs_key key
;
274 struct btrfs_block_group_item item
;
277 struct btrfs_fs_info
{
278 struct btrfs_root
*fs_root
;
279 struct btrfs_root
*extent_root
;
280 struct btrfs_root
*tree_root
;
281 struct btrfs_key current_insert
;
282 struct btrfs_key last_insert
;
283 struct radix_tree_root cache_radix
;
284 struct radix_tree_root pinned_radix
;
285 struct radix_tree_root block_group_radix
;
286 struct list_head trans
;
287 struct list_head cache
;
288 u64 last_inode_alloc
;
289 u64 last_inode_alloc_dirid
;
293 struct btrfs_trans_handle
*running_transaction
;
294 struct btrfs_super_block
*disk_super
;
298 * in ram representation of the tree. extent_root is used for all allocations
299 * and for the extent tree extent_root root. current_insert is used
300 * only for the extent tree.
303 struct btrfs_buffer
*node
;
304 struct btrfs_buffer
*commit_root
;
305 struct btrfs_root_item root_item
;
306 struct btrfs_key root_key
;
307 struct btrfs_fs_info
*fs_info
;
313 /* the lower bits in the key flags defines the item type */
314 #define BTRFS_KEY_TYPE_MAX 256
315 #define BTRFS_KEY_TYPE_SHIFT 24
316 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
317 BTRFS_KEY_TYPE_SHIFT)
320 * inode items have the data typically returned from stat and store other
321 * info about object characteristics. There is one for every file and dir in
324 #define BTRFS_INODE_ITEM_KEY 1
326 /* reserve 2-15 close to the inode for later flexibility */
329 * dir items are the name -> inode pointers in a directory. There is one
330 * for every name in a directory.
332 #define BTRFS_DIR_ITEM_KEY 16
333 #define BTRFS_DIR_INDEX_KEY 17
335 * extent data is for file data
337 #define BTRFS_EXTENT_DATA_KEY 18
339 * csum items have the checksums for data in the extents
341 #define BTRFS_CSUM_ITEM_KEY 19
343 /* reserve 20-31 for other file stuff */
346 * root items point to tree roots. There are typically in the root
347 * tree used by the super block to find all the other trees
349 #define BTRFS_ROOT_ITEM_KEY 32
351 * extent items are in the extent map tree. These record which blocks
352 * are used, and how many references there are to each block
354 #define BTRFS_EXTENT_ITEM_KEY 33
357 * block groups give us hints into the extent allocation trees. Which
358 * blocks are free etc etc
360 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
363 * string items are for debugging. They just store a short string of
366 #define BTRFS_STRING_ITEM_KEY 253
369 static inline u64
btrfs_block_group_used(struct btrfs_block_group_item
*bi
)
371 return le64_to_cpu(bi
->used
);
374 static inline void btrfs_set_block_group_used(struct
375 btrfs_block_group_item
*bi
,
378 bi
->used
= cpu_to_le64(val
);
381 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
383 return le64_to_cpu(i
->generation
);
386 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
389 i
->generation
= cpu_to_le64(val
);
392 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
394 return le64_to_cpu(i
->size
);
397 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
399 i
->size
= cpu_to_le64(val
);
402 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
404 return le64_to_cpu(i
->nblocks
);
407 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
409 i
->nblocks
= cpu_to_le64(val
);
412 static inline u64
btrfs_inode_block_group(struct btrfs_inode_item
*i
)
414 return le64_to_cpu(i
->block_group
);
417 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item
*i
,
420 i
->block_group
= cpu_to_le64(val
);
423 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
425 return le32_to_cpu(i
->nlink
);
428 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
430 i
->nlink
= cpu_to_le32(val
);
433 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
435 return le32_to_cpu(i
->uid
);
438 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
440 i
->uid
= cpu_to_le32(val
);
443 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
445 return le32_to_cpu(i
->gid
);
448 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
450 i
->gid
= cpu_to_le32(val
);
453 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
455 return le32_to_cpu(i
->mode
);
458 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
460 i
->mode
= cpu_to_le32(val
);
463 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
465 return le32_to_cpu(i
->rdev
);
468 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
470 i
->rdev
= cpu_to_le32(val
);
473 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
475 return le16_to_cpu(i
->flags
);
478 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
480 i
->flags
= cpu_to_le16(val
);
483 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
485 return le16_to_cpu(i
->compat_flags
);
488 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
491 i
->compat_flags
= cpu_to_le16(val
);
494 static inline u64
btrfs_timespec_sec(struct btrfs_inode_timespec
*ts
)
496 return le64_to_cpu(ts
->sec
);
499 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec
*ts
,
502 ts
->sec
= cpu_to_le64(val
);
505 static inline u32
btrfs_timespec_nsec(struct btrfs_inode_timespec
*ts
)
507 return le32_to_cpu(ts
->nsec
);
510 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec
*ts
,
513 ts
->nsec
= cpu_to_le32(val
);
516 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
518 return le32_to_cpu(ei
->refs
);
521 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
523 ei
->refs
= cpu_to_le32(val
);
526 static inline u64
btrfs_extent_owner(struct btrfs_extent_item
*ei
)
528 return le64_to_cpu(ei
->owner
);
531 static inline void btrfs_set_extent_owner(struct btrfs_extent_item
*ei
, u64 val
)
533 ei
->owner
= cpu_to_le64(val
);
536 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
538 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
542 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
545 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
548 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
550 return le32_to_cpu(item
->offset
);
553 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
555 item
->offset
= cpu_to_le32(val
);
558 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
560 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
563 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
565 return le16_to_cpu(item
->size
);
568 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
570 item
->size
= cpu_to_le16(val
);
573 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
575 return le16_to_cpu(d
->flags
);
578 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
580 d
->flags
= cpu_to_le16(val
);
583 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
588 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
593 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
595 return le16_to_cpu(d
->name_len
);
598 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
600 d
->name_len
= cpu_to_le16(val
);
603 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
604 struct btrfs_disk_key
*disk
)
606 cpu
->offset
= le64_to_cpu(disk
->offset
);
607 cpu
->flags
= le32_to_cpu(disk
->flags
);
608 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
611 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
612 struct btrfs_key
*cpu
)
614 disk
->offset
= cpu_to_le64(cpu
->offset
);
615 disk
->flags
= cpu_to_le32(cpu
->flags
);
616 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
619 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
621 return le64_to_cpu(disk
->objectid
);
624 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
627 disk
->objectid
= cpu_to_le64(val
);
630 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
632 return le64_to_cpu(disk
->offset
);
635 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
638 disk
->offset
= cpu_to_le64(val
);
641 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
643 return le32_to_cpu(disk
->flags
);
646 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
649 disk
->flags
= cpu_to_le32(val
);
652 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
654 return le32_to_cpu(key
->flags
) >> BTRFS_KEY_TYPE_SHIFT
;
657 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
,
660 u32 flags
= btrfs_disk_key_flags(key
);
661 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
662 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
663 flags
= (flags
& ~BTRFS_KEY_TYPE_MASK
) | val
;
664 btrfs_set_disk_key_flags(key
, flags
);
667 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
669 return key
->flags
>> BTRFS_KEY_TYPE_SHIFT
;
672 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 val
)
674 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
675 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
676 key
->flags
= (key
->flags
& ~(BTRFS_KEY_TYPE_MASK
)) | val
;
679 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
681 return le64_to_cpu(h
->blocknr
);
684 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
686 h
->blocknr
= cpu_to_le64(blocknr
);
689 static inline u64
btrfs_header_generation(struct btrfs_header
*h
)
691 return le64_to_cpu(h
->generation
);
694 static inline void btrfs_set_header_generation(struct btrfs_header
*h
,
697 h
->generation
= cpu_to_le64(val
);
700 static inline u64
btrfs_header_owner(struct btrfs_header
*h
)
702 return le64_to_cpu(h
->owner
);
705 static inline void btrfs_set_header_owner(struct btrfs_header
*h
,
708 h
->owner
= cpu_to_le64(val
);
711 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
713 return le16_to_cpu(h
->nritems
);
716 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
718 h
->nritems
= cpu_to_le16(val
);
721 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
723 return le16_to_cpu(h
->flags
);
726 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
728 h
->flags
= cpu_to_le16(val
);
731 static inline int btrfs_header_level(struct btrfs_header
*h
)
736 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
738 BUG_ON(level
> BTRFS_MAX_LEVEL
);
742 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
744 return (btrfs_header_level(&n
->header
) == 0);
747 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
749 return le64_to_cpu(item
->blocknr
);
752 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
754 item
->blocknr
= cpu_to_le64(val
);
757 static inline u64
btrfs_root_dirid(struct btrfs_root_item
*item
)
759 return le64_to_cpu(item
->root_dirid
);
762 static inline void btrfs_set_root_dirid(struct btrfs_root_item
*item
, u64 val
)
764 item
->root_dirid
= cpu_to_le64(val
);
767 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
769 return le32_to_cpu(item
->refs
);
772 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
774 item
->refs
= cpu_to_le32(val
);
777 static inline u32
btrfs_root_flags(struct btrfs_root_item
*item
)
779 return le32_to_cpu(item
->flags
);
782 static inline void btrfs_set_root_flags(struct btrfs_root_item
*item
, u32 val
)
784 item
->flags
= cpu_to_le32(val
);
787 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
789 return le64_to_cpu(s
->blocknr
);
792 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
794 s
->blocknr
= cpu_to_le64(val
);
797 static inline u64
btrfs_super_generation(struct btrfs_super_block
*s
)
799 return le64_to_cpu(s
->generation
);
802 static inline void btrfs_set_super_generation(struct btrfs_super_block
*s
,
805 s
->generation
= cpu_to_le64(val
);
808 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
810 return le64_to_cpu(s
->root
);
813 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
815 s
->root
= cpu_to_le64(val
);
818 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
820 return le64_to_cpu(s
->total_blocks
);
823 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
826 s
->total_blocks
= cpu_to_le64(val
);
829 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
831 return le64_to_cpu(s
->blocks_used
);
834 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
837 s
->blocks_used
= cpu_to_le64(val
);
840 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
842 return le32_to_cpu(s
->blocksize
);
845 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
848 s
->blocksize
= cpu_to_le32(val
);
851 static inline u64
btrfs_super_root_dir(struct btrfs_super_block
*s
)
853 return le64_to_cpu(s
->root_dir_objectid
);
856 static inline void btrfs_set_super_root_dir(struct btrfs_super_block
*s
, u64
859 s
->root_dir_objectid
= cpu_to_le64(val
);
862 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
864 return (u8
*)l
->items
;
867 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item
*e
)
871 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item
*e
,
877 static inline char *btrfs_file_extent_inline_start(struct
878 btrfs_file_extent_item
*e
)
880 return (char *)(&e
->disk_blocknr
);
883 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
885 return (unsigned long)(&((struct
886 btrfs_file_extent_item
*)NULL
)->disk_blocknr
) + datasize
;
889 static inline u32
btrfs_file_extent_inline_len(struct btrfs_item
*e
)
891 struct btrfs_file_extent_item
*fe
= NULL
;
892 return btrfs_item_size(e
) - (unsigned long)(&fe
->disk_blocknr
);
895 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
898 return le64_to_cpu(e
->disk_blocknr
);
901 static inline void btrfs_set_file_extent_disk_blocknr(struct
902 btrfs_file_extent_item
905 e
->disk_blocknr
= cpu_to_le64(val
);
908 static inline u64
btrfs_file_extent_generation(struct btrfs_file_extent_item
*e
)
910 return le64_to_cpu(e
->generation
);
913 static inline void btrfs_set_file_extent_generation(struct
914 btrfs_file_extent_item
*e
,
917 e
->generation
= cpu_to_le64(val
);
920 static inline u64
btrfs_file_extent_disk_num_blocks(struct
921 btrfs_file_extent_item
*e
)
923 return le64_to_cpu(e
->disk_num_blocks
);
926 static inline void btrfs_set_file_extent_disk_num_blocks(struct
927 btrfs_file_extent_item
930 e
->disk_num_blocks
= cpu_to_le64(val
);
933 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
935 return le64_to_cpu(e
->offset
);
938 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
941 e
->offset
= cpu_to_le64(val
);
944 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
947 return le64_to_cpu(e
->num_blocks
);
950 static inline void btrfs_set_file_extent_num_blocks(struct
951 btrfs_file_extent_item
*e
,
954 e
->num_blocks
= cpu_to_le64(val
);
957 /* helper function to cast into the data area of the leaf. */
958 #define btrfs_item_ptr(leaf, slot, type) \
959 ((type *)(btrfs_leaf_data(leaf) + \
960 btrfs_item_offset((leaf)->items + (slot))))
962 int btrfs_comp_keys(struct btrfs_disk_key
*disk
, struct btrfs_key
*k2
);
963 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
964 *root
, struct btrfs_path
*path
, u32 data_size
);
965 struct btrfs_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
966 struct btrfs_root
*root
);
967 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
968 struct btrfs_buffer
*buf
);
969 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
970 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
971 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
972 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
974 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
975 void btrfs_init_path(struct btrfs_path
*p
);
976 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
977 struct btrfs_path
*path
);
978 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
979 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
980 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
981 *root
, struct btrfs_path
*path
, struct btrfs_key
982 *cpu_key
, u32 data_size
);
983 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
984 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
985 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
986 *root
, struct btrfs_buffer
*snap
);
987 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
, struct
989 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
990 struct btrfs_key
*key
);
991 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
992 *root
, struct btrfs_key
*key
, struct btrfs_root_item
994 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
995 *root
, struct btrfs_key
*key
, struct btrfs_root_item
997 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
998 btrfs_root_item
*item
, struct btrfs_key
*key
);
999 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1000 *root
, char *name
, int name_len
, u64 dir
,
1001 struct btrfs_key
*location
, u8 type
);
1002 int btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1003 *root
, struct btrfs_path
*path
, u64 dir
, char *name
,
1004 int name_len
, int mod
);
1005 int btrfs_match_dir_item_name(struct btrfs_root
*root
, struct btrfs_path
*path
,
1006 char *name
, int name_len
);
1007 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1008 struct btrfs_root
*fs_root
,
1009 u64 dirid
, u64
*objectid
);
1010 int btrfs_insert_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1011 *root
, u64 objectid
, struct btrfs_inode_item
1013 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1014 *root
, struct btrfs_path
*path
, u64 objectid
, int mod
);
1015 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
1016 struct btrfs_root
*root
);
1017 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
1018 int btrfs_read_block_groups(struct btrfs_root
*root
);
1019 int btrfs_insert_block_group(struct btrfs_trans_handle
*trans
,
1020 struct btrfs_root
*root
,
1021 struct btrfs_key
*key
,
1022 struct btrfs_block_group_item
*bi
);