5 #include <linux/buffer_head.h>
6 #include <linux/kobject.h>
9 struct btrfs_trans_handle
;
10 struct btrfs_transaction
;
11 extern struct kmem_cache
*btrfs_path_cachep
;
13 #define BTRFS_MAGIC "_BtRfS_M"
15 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
16 #define BTRFS_DEV_TREE_OBJECTID 2ULL
17 #define BTRFS_EXTENT_TREE_OBJECTID 3ULL
18 #define BTRFS_FS_TREE_OBJECTID 4ULL
19 #define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
20 #define BTRFS_FIRST_FREE_OBJECTID 6ULL
23 * we can actually store much bigger names, but lets not confuse the rest
26 #define BTRFS_NAME_LEN 255
28 /* 32 bytes in various csum fields */
29 #define BTRFS_CSUM_SIZE 32
32 * the key defines the order in the tree, and so it also defines (optimal)
33 * block layout. objectid corresonds to the inode number. The flags
34 * tells us things about the object, and is a kind of stream selector.
35 * so for a given inode, keys with flags of 1 might refer to the inode
36 * data, flags of 2 may point to file data in the btree and flags == 3
37 * may point to extents.
39 * offset is the starting byte offset for this key in the stream.
41 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
42 * in cpu native order. Otherwise they are identical and their sizes
43 * should be the same (ie both packed)
45 struct btrfs_disk_key
{
49 } __attribute__ ((__packed__
));
55 } __attribute__ ((__packed__
));
58 * every tree block (leaf or node) starts with this header.
61 u8 csum
[BTRFS_CSUM_SIZE
];
62 u8 fsid
[16]; /* FS specific uuid */
63 __le64 blocknr
; /* which block this node is supposed to live in */
68 } __attribute__ ((__packed__
));
70 #define BTRFS_MAX_LEVEL 8
71 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
72 sizeof(struct btrfs_header)) / \
73 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
74 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
75 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
76 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
77 sizeof(struct btrfs_item) - \
78 sizeof(struct btrfs_file_extent_item))
82 * the super block basically lists the main trees of the FS
83 * it currently lacks any block count etc etc
85 struct btrfs_super_block
{
86 u8 csum
[BTRFS_CSUM_SIZE
];
87 /* the first 3 fields must match struct btrfs_header */
88 u8 fsid
[16]; /* FS specific uuid */
89 __le64 blocknr
; /* this block number */
96 __le64 root_dir_objectid
;
97 __le64 last_device_id
;
98 /* fields below here vary with the underlying disk */
99 __le64 device_block_start
;
100 __le64 device_num_blocks
;
103 } __attribute__ ((__packed__
));
106 * A leaf is full of items. offset and size tell us where to find
107 * the item in the leaf (relative to the start of the data area)
110 struct btrfs_disk_key key
;
113 } __attribute__ ((__packed__
));
116 * leaves have an item area and a data area:
117 * [item0, item1....itemN] [free space] [dataN...data1, data0]
119 * The data is separate from the items to get the keys closer together
123 struct btrfs_header header
;
124 struct btrfs_item items
[];
125 } __attribute__ ((__packed__
));
128 * all non-leaf blocks are nodes, they hold only keys and pointers to
131 struct btrfs_key_ptr
{
132 struct btrfs_disk_key key
;
134 } __attribute__ ((__packed__
));
137 struct btrfs_header header
;
138 struct btrfs_key_ptr ptrs
[];
139 } __attribute__ ((__packed__
));
142 * btrfs_paths remember the path taken from the root down to the leaf.
143 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
144 * to any other levels that are present.
146 * The slots array records the index of the item or block pointer
147 * used while walking the tree.
150 struct buffer_head
*nodes
[BTRFS_MAX_LEVEL
];
151 int slots
[BTRFS_MAX_LEVEL
];
155 * items in the extent btree are used to record the objectid of the
156 * owner of the block and the number of references
158 struct btrfs_extent_item
{
160 } __attribute__ ((__packed__
));
162 struct btrfs_inode_timespec
{
165 } __attribute__ ((__packed__
));
168 * there is no padding here on purpose. If you want to extent the inode,
169 * make a new item type
171 struct btrfs_inode_item
{
182 struct btrfs_inode_timespec atime
;
183 struct btrfs_inode_timespec ctime
;
184 struct btrfs_inode_timespec mtime
;
185 struct btrfs_inode_timespec otime
;
186 } __attribute__ ((__packed__
));
188 struct btrfs_dir_item
{
189 struct btrfs_disk_key location
;
193 } __attribute__ ((__packed__
));
195 struct btrfs_root_item
{
196 struct btrfs_inode_item inode
;
203 } __attribute__ ((__packed__
));
205 #define BTRFS_FILE_EXTENT_REG 0
206 #define BTRFS_FILE_EXTENT_INLINE 1
208 struct btrfs_file_extent_item
{
212 * disk space consumed by the extent, checksum blocks are included
216 __le64 disk_num_blocks
;
218 * the logical offset in file blocks (no csums)
219 * this extent record is for. This allows a file extent to point
220 * into the middle of an existing extent on disk, sharing it
221 * between two snapshots (useful if some bytes in the middle of the
222 * extent have changed
226 * the logical number of file blocks (no csums included)
229 } __attribute__ ((__packed__
));
231 struct btrfs_csum_item
{
232 u8 csum
[BTRFS_CSUM_SIZE
];
233 } __attribute__ ((__packed__
));
235 struct btrfs_device_item
{
238 } __attribute__ ((__packed__
));
241 struct btrfs_fs_info
{
242 struct btrfs_root
*extent_root
;
243 struct btrfs_root
*tree_root
;
244 struct btrfs_root
*dev_root
;
245 struct btrfs_key current_insert
;
246 struct btrfs_key last_insert
;
247 struct radix_tree_root fs_roots_radix
;
248 struct radix_tree_root pending_del_radix
;
249 struct radix_tree_root pinned_radix
;
250 struct radix_tree_root dev_radix
;
252 struct btrfs_transaction
*running_transaction
;
253 struct btrfs_super_block
*disk_super
;
254 struct buffer_head
*sb_buffer
;
255 struct super_block
*sb
;
256 struct inode
*btree_inode
;
257 struct mutex trans_mutex
;
258 struct mutex fs_mutex
;
259 struct list_head trans_list
;
260 struct crypto_hash
*hash_tfm
;
261 spinlock_t hash_lock
;
266 * in ram representation of the tree. extent_root is used for all allocations
267 * and for the extent tree extent_root root. current_insert is used
268 * only for the extent tree.
271 struct buffer_head
*node
;
272 struct buffer_head
*commit_root
;
273 struct btrfs_root_item root_item
;
274 struct btrfs_key root_key
;
275 struct btrfs_fs_info
*fs_info
;
283 u64 last_inode_alloc
;
286 /* the lower bits in the key flags defines the item type */
287 #define BTRFS_KEY_TYPE_MAX 256
288 #define BTRFS_KEY_TYPE_SHIFT 24
289 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
290 BTRFS_KEY_TYPE_SHIFT)
293 * inode items have the data typically returned from stat and store other
294 * info about object characteristics. There is one for every file and dir in
297 #define BTRFS_INODE_ITEM_KEY 1
300 * dir items are the name -> inode pointers in a directory. There is one
301 * for every name in a directory.
303 #define BTRFS_DIR_ITEM_KEY 2
304 #define BTRFS_DIR_INDEX_KEY 3
306 * inline data is file data that fits in the btree.
308 #define BTRFS_INLINE_DATA_KEY 4
310 * extent data is for data that can't fit in the btree. It points to
311 * a (hopefully) huge chunk of disk
313 #define BTRFS_EXTENT_DATA_KEY 5
315 * csum items have the checksums for data in the extents
317 #define BTRFS_CSUM_ITEM_KEY 6
320 * root items point to tree roots. There are typically in the root
321 * tree used by the super block to find all the other trees
323 #define BTRFS_ROOT_ITEM_KEY 7
325 * extent items are in the extent map tree. These record which blocks
326 * are used, and how many references there are to each block
328 #define BTRFS_EXTENT_ITEM_KEY 8
331 * dev items list the devices that make up the FS
333 #define BTRFS_DEV_ITEM_KEY 9
336 * string items are for debugging. They just store a short string of
339 #define BTRFS_STRING_ITEM_KEY 10
341 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
343 return le64_to_cpu(i
->generation
);
346 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
349 i
->generation
= cpu_to_le64(val
);
352 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
354 return le64_to_cpu(i
->size
);
357 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
359 i
->size
= cpu_to_le64(val
);
362 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
364 return le64_to_cpu(i
->nblocks
);
367 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
369 i
->nblocks
= cpu_to_le64(val
);
372 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
374 return le32_to_cpu(i
->nlink
);
377 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
379 i
->nlink
= cpu_to_le32(val
);
382 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
384 return le32_to_cpu(i
->uid
);
387 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
389 i
->uid
= cpu_to_le32(val
);
392 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
394 return le32_to_cpu(i
->gid
);
397 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
399 i
->gid
= cpu_to_le32(val
);
402 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
404 return le32_to_cpu(i
->mode
);
407 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
409 i
->mode
= cpu_to_le32(val
);
412 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
414 return le32_to_cpu(i
->rdev
);
417 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
419 i
->rdev
= cpu_to_le32(val
);
422 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
424 return le16_to_cpu(i
->flags
);
427 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
429 i
->flags
= cpu_to_le16(val
);
432 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
434 return le16_to_cpu(i
->compat_flags
);
437 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
440 i
->compat_flags
= cpu_to_le16(val
);
443 static inline u64
btrfs_timespec_sec(struct btrfs_inode_timespec
*ts
)
445 return le64_to_cpu(ts
->sec
);
448 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec
*ts
,
451 ts
->sec
= cpu_to_le64(val
);
454 static inline u32
btrfs_timespec_nsec(struct btrfs_inode_timespec
*ts
)
456 return le32_to_cpu(ts
->nsec
);
459 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec
*ts
,
462 ts
->nsec
= cpu_to_le32(val
);
465 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
467 return le32_to_cpu(ei
->refs
);
470 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
472 ei
->refs
= cpu_to_le32(val
);
475 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
477 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
480 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
483 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
486 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
488 return le32_to_cpu(item
->offset
);
491 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
493 item
->offset
= cpu_to_le32(val
);
496 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
498 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
501 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
503 return le16_to_cpu(item
->size
);
506 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
508 item
->size
= cpu_to_le16(val
);
511 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
513 return le16_to_cpu(d
->flags
);
516 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
518 d
->flags
= cpu_to_le16(val
);
521 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
526 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
531 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
533 return le16_to_cpu(d
->name_len
);
536 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
538 d
->name_len
= cpu_to_le16(val
);
541 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
542 struct btrfs_disk_key
*disk
)
544 cpu
->offset
= le64_to_cpu(disk
->offset
);
545 cpu
->flags
= le32_to_cpu(disk
->flags
);
546 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
549 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
550 struct btrfs_key
*cpu
)
552 disk
->offset
= cpu_to_le64(cpu
->offset
);
553 disk
->flags
= cpu_to_le32(cpu
->flags
);
554 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
557 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
559 return le64_to_cpu(disk
->objectid
);
562 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
565 disk
->objectid
= cpu_to_le64(val
);
568 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
570 return le64_to_cpu(disk
->offset
);
573 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
576 disk
->offset
= cpu_to_le64(val
);
579 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
581 return le32_to_cpu(disk
->flags
);
584 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
587 disk
->flags
= cpu_to_le32(val
);
590 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
592 return le32_to_cpu(key
->flags
) >> BTRFS_KEY_TYPE_SHIFT
;
595 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
,
598 u32 flags
= btrfs_disk_key_flags(key
);
599 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
600 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
601 flags
= (flags
& ~BTRFS_KEY_TYPE_MASK
) | val
;
602 btrfs_set_disk_key_flags(key
, flags
);
605 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
607 return key
->flags
>> BTRFS_KEY_TYPE_SHIFT
;
610 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 val
)
612 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
613 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
614 key
->flags
= (key
->flags
& ~(BTRFS_KEY_TYPE_MASK
)) | val
;
617 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
619 return le64_to_cpu(h
->blocknr
);
622 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
624 h
->blocknr
= cpu_to_le64(blocknr
);
627 static inline u64
btrfs_header_generation(struct btrfs_header
*h
)
629 return le64_to_cpu(h
->generation
);
632 static inline void btrfs_set_header_generation(struct btrfs_header
*h
,
635 h
->generation
= cpu_to_le64(val
);
638 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
640 return le16_to_cpu(h
->nritems
);
643 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
645 h
->nritems
= cpu_to_le16(val
);
648 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
650 return le16_to_cpu(h
->flags
);
653 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
655 h
->flags
= cpu_to_le16(val
);
658 static inline int btrfs_header_level(struct btrfs_header
*h
)
663 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
665 BUG_ON(level
> BTRFS_MAX_LEVEL
);
669 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
671 return (btrfs_header_level(&n
->header
) == 0);
674 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
676 return le64_to_cpu(item
->blocknr
);
679 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
681 item
->blocknr
= cpu_to_le64(val
);
684 static inline u64
btrfs_root_dirid(struct btrfs_root_item
*item
)
686 return le64_to_cpu(item
->root_dirid
);
689 static inline void btrfs_set_root_dirid(struct btrfs_root_item
*item
, u64 val
)
691 item
->root_dirid
= cpu_to_le64(val
);
694 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
696 return le32_to_cpu(item
->refs
);
699 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
701 item
->refs
= cpu_to_le32(val
);
704 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
706 return le64_to_cpu(s
->blocknr
);
709 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
711 s
->blocknr
= cpu_to_le64(val
);
714 static inline u64
btrfs_super_generation(struct btrfs_super_block
*s
)
716 return le64_to_cpu(s
->generation
);
719 static inline void btrfs_set_super_generation(struct btrfs_super_block
*s
,
722 s
->generation
= cpu_to_le64(val
);
725 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
727 return le64_to_cpu(s
->root
);
730 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
732 s
->root
= cpu_to_le64(val
);
735 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
737 return le64_to_cpu(s
->total_blocks
);
740 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
743 s
->total_blocks
= cpu_to_le64(val
);
746 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
748 return le64_to_cpu(s
->blocks_used
);
751 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
754 s
->blocks_used
= cpu_to_le64(val
);
757 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
759 return le32_to_cpu(s
->blocksize
);
762 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
765 s
->blocksize
= cpu_to_le32(val
);
768 static inline u64
btrfs_super_root_dir(struct btrfs_super_block
*s
)
770 return le64_to_cpu(s
->root_dir_objectid
);
773 static inline void btrfs_set_super_root_dir(struct btrfs_super_block
*s
, u64
776 s
->root_dir_objectid
= cpu_to_le64(val
);
779 static inline u64
btrfs_super_last_device_id(struct btrfs_super_block
*s
)
781 return le64_to_cpu(s
->last_device_id
);
784 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block
*s
,
787 s
->last_device_id
= cpu_to_le64(val
);
790 static inline u64
btrfs_super_device_id(struct btrfs_super_block
*s
)
792 return le64_to_cpu(s
->device_id
);
795 static inline void btrfs_set_super_device_id(struct btrfs_super_block
*s
,
798 s
->device_id
= cpu_to_le64(val
);
801 static inline u64
btrfs_super_device_block_start(struct btrfs_super_block
*s
)
803 return le64_to_cpu(s
->device_block_start
);
806 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
809 s
->device_block_start
= cpu_to_le64(val
);
812 static inline u64
btrfs_super_device_num_blocks(struct btrfs_super_block
*s
)
814 return le64_to_cpu(s
->device_num_blocks
);
817 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
820 s
->device_num_blocks
= cpu_to_le64(val
);
823 static inline u64
btrfs_super_device_root(struct btrfs_super_block
*s
)
825 return le64_to_cpu(s
->device_root
);
828 static inline void btrfs_set_super_device_root(struct btrfs_super_block
831 s
->device_root
= cpu_to_le64(val
);
835 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
837 return (u8
*)l
->items
;
840 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item
*e
)
844 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item
*e
,
850 static inline char *btrfs_file_extent_inline_start(struct
851 btrfs_file_extent_item
*e
)
853 return (char *)(&e
->disk_blocknr
);
856 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
858 return (unsigned long)(&((struct
859 btrfs_file_extent_item
*)NULL
)->disk_blocknr
) + datasize
;
862 static inline u32
btrfs_file_extent_inline_len(struct btrfs_item
*e
)
864 struct btrfs_file_extent_item
*fe
= NULL
;
865 return btrfs_item_size(e
) - (unsigned long)(&fe
->disk_blocknr
);
868 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
871 return le64_to_cpu(e
->disk_blocknr
);
874 static inline void btrfs_set_file_extent_disk_blocknr(struct
875 btrfs_file_extent_item
878 e
->disk_blocknr
= cpu_to_le64(val
);
881 static inline u64
btrfs_file_extent_generation(struct btrfs_file_extent_item
*e
)
883 return le64_to_cpu(e
->generation
);
886 static inline void btrfs_set_file_extent_generation(struct
887 btrfs_file_extent_item
*e
,
890 e
->generation
= cpu_to_le64(val
);
893 static inline u64
btrfs_file_extent_disk_num_blocks(struct
894 btrfs_file_extent_item
*e
)
896 return le64_to_cpu(e
->disk_num_blocks
);
899 static inline void btrfs_set_file_extent_disk_num_blocks(struct
900 btrfs_file_extent_item
903 e
->disk_num_blocks
= cpu_to_le64(val
);
906 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
908 return le64_to_cpu(e
->offset
);
911 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
914 e
->offset
= cpu_to_le64(val
);
917 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
920 return le64_to_cpu(e
->num_blocks
);
923 static inline void btrfs_set_file_extent_num_blocks(struct
924 btrfs_file_extent_item
*e
,
927 e
->num_blocks
= cpu_to_le64(val
);
930 static inline u16
btrfs_device_pathlen(struct btrfs_device_item
*d
)
932 return le16_to_cpu(d
->pathlen
);
935 static inline void btrfs_set_device_pathlen(struct btrfs_device_item
*d
,
938 d
->pathlen
= cpu_to_le16(val
);
941 static inline u64
btrfs_device_id(struct btrfs_device_item
*d
)
943 return le64_to_cpu(d
->device_id
);
946 static inline void btrfs_set_device_id(struct btrfs_device_item
*d
,
949 d
->device_id
= cpu_to_le64(val
);
952 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
954 return sb
->s_fs_info
;
957 static inline void btrfs_check_bounds(void *vptr
, size_t len
,
958 void *vcontainer
, size_t container_len
)
961 char *container
= vcontainer
;
962 WARN_ON(ptr
< container
);
963 WARN_ON(ptr
+ len
> container
+ container_len
);
966 static inline void btrfs_memcpy(struct btrfs_root
*root
,
968 void *dst
, const void *src
, size_t nr
)
970 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
971 memcpy(dst
, src
, nr
);
974 static inline void btrfs_memmove(struct btrfs_root
*root
,
976 void *dst
, void *src
, size_t nr
)
978 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
979 memmove(dst
, src
, nr
);
982 static inline void btrfs_mark_buffer_dirty(struct buffer_head
*bh
)
984 WARN_ON(!atomic_read(&bh
->b_count
));
985 mark_buffer_dirty(bh
);
988 /* helper function to cast into the data area of the leaf. */
989 #define btrfs_item_ptr(leaf, slot, type) \
990 ((type *)(btrfs_leaf_data(leaf) + \
991 btrfs_item_offset((leaf)->items + (slot))))
994 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
995 struct btrfs_root
*root
);
996 struct buffer_head
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
997 struct btrfs_root
*root
);
998 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
999 *root
, u64 num_blocks
, u64 search_start
, u64
1000 search_end
, struct btrfs_key
*ins
);
1001 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1002 struct buffer_head
*buf
);
1003 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
1004 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
1005 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
, struct
1007 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1008 struct btrfs_root
*root
,
1009 u64 blocknr
, u64 num_blocks
);
1011 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1012 *root
, struct btrfs_path
*path
, u32 data_size
);
1013 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
1014 struct btrfs_root
*root
,
1015 struct btrfs_path
*path
,
1017 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1018 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
1020 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
1021 struct btrfs_path
*btrfs_alloc_path(void);
1022 void btrfs_free_path(struct btrfs_path
*p
);
1023 void btrfs_init_path(struct btrfs_path
*p
);
1024 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1025 struct btrfs_path
*path
);
1026 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1027 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1028 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1029 *root
, struct btrfs_path
*path
, struct btrfs_key
1030 *cpu_key
, u32 data_size
);
1031 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1032 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
1033 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1034 *root
, struct buffer_head
*snap
);
1036 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1037 struct btrfs_key
*key
);
1038 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1039 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1041 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1042 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1044 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1045 btrfs_root_item
*item
, struct btrfs_key
*key
);
1047 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1048 *root
, const char *name
, int name_len
, u64 dir
,
1049 struct btrfs_key
*location
, u8 type
);
1050 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1051 struct btrfs_root
*root
,
1052 struct btrfs_path
*path
, u64 dir
,
1053 const char *name
, int name_len
,
1055 struct btrfs_dir_item
*
1056 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1057 struct btrfs_root
*root
,
1058 struct btrfs_path
*path
, u64 dir
,
1059 u64 objectid
, const char *name
, int name_len
,
1061 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1062 struct btrfs_path
*path
,
1063 const char *name
, int name_len
);
1064 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1065 struct btrfs_root
*root
,
1066 struct btrfs_path
*path
,
1067 struct btrfs_dir_item
*di
);
1069 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1070 struct btrfs_root
*fs_root
,
1071 u64 dirid
, u64
*objectid
);
1072 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1075 int btrfs_insert_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1076 *root
, u64 objectid
, struct btrfs_inode_item
1078 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1079 *root
, struct btrfs_path
*path
,
1080 struct btrfs_key
*location
, int mod
);
1083 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1084 struct btrfs_root
*root
,
1085 u64 objectid
, u64 pos
, u64 offset
,
1087 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1088 struct btrfs_root
*root
,
1089 struct btrfs_path
*path
, u64 objectid
,
1090 u64 blocknr
, int mod
);
1091 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1092 struct btrfs_root
*root
,
1093 u64 objectid
, u64 offset
,
1094 char *data
, size_t len
);
1095 int btrfs_csum_verify_file_block(struct btrfs_root
*root
,
1096 u64 objectid
, u64 offset
,
1097 char *data
, size_t len
);
1098 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1099 struct btrfs_root
*root
,
1100 struct btrfs_path
*path
,
1101 u64 objectid
, u64 offset
,
1104 extern struct subsystem btrfs_subsys
;