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_trans_handle_cachep
;
12 extern struct kmem_cache
*btrfs_transaction_cachep
;
13 extern struct kmem_cache
*btrfs_bit_radix_cachep
;
14 extern struct kmem_cache
*btrfs_path_cachep
;
16 #define BTRFS_MAGIC "_BtRfS_M"
18 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
19 #define BTRFS_DEV_TREE_OBJECTID 2ULL
20 #define BTRFS_EXTENT_TREE_OBJECTID 3ULL
21 #define BTRFS_FS_TREE_OBJECTID 4ULL
22 #define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
23 #define BTRFS_FIRST_FREE_OBJECTID 6ULL
26 * we can actually store much bigger names, but lets not confuse the rest
29 #define BTRFS_NAME_LEN 255
31 /* 32 bytes in various csum fields */
32 #define BTRFS_CSUM_SIZE 32
35 * the key defines the order in the tree, and so it also defines (optimal)
36 * block layout. objectid corresonds to the inode number. The flags
37 * tells us things about the object, and is a kind of stream selector.
38 * so for a given inode, keys with flags of 1 might refer to the inode
39 * data, flags of 2 may point to file data in the btree and flags == 3
40 * may point to extents.
42 * offset is the starting byte offset for this key in the stream.
44 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
45 * in cpu native order. Otherwise they are identical and their sizes
46 * should be the same (ie both packed)
48 struct btrfs_disk_key
{
52 } __attribute__ ((__packed__
));
58 } __attribute__ ((__packed__
));
61 * every tree block (leaf or node) starts with this header.
64 u8 csum
[BTRFS_CSUM_SIZE
];
65 u8 fsid
[16]; /* FS specific uuid */
66 __le64 blocknr
; /* which block this node is supposed to live in */
72 } __attribute__ ((__packed__
));
74 #define BTRFS_MAX_LEVEL 8
75 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
76 sizeof(struct btrfs_header)) / \
77 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
78 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
79 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
80 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
81 sizeof(struct btrfs_item) - \
82 sizeof(struct btrfs_file_extent_item))
86 * the super block basically lists the main trees of the FS
87 * it currently lacks any block count etc etc
89 struct btrfs_super_block
{
90 u8 csum
[BTRFS_CSUM_SIZE
];
91 /* the first 3 fields must match struct btrfs_header */
92 u8 fsid
[16]; /* FS specific uuid */
93 __le64 blocknr
; /* this block number */
100 __le64 root_dir_objectid
;
101 __le64 last_device_id
;
102 /* fields below here vary with the underlying disk */
103 __le64 device_block_start
;
104 __le64 device_num_blocks
;
107 } __attribute__ ((__packed__
));
110 * A leaf is full of items. offset and size tell us where to find
111 * the item in the leaf (relative to the start of the data area)
114 struct btrfs_disk_key key
;
117 } __attribute__ ((__packed__
));
120 * leaves have an item area and a data area:
121 * [item0, item1....itemN] [free space] [dataN...data1, data0]
123 * The data is separate from the items to get the keys closer together
127 struct btrfs_header header
;
128 struct btrfs_item items
[];
129 } __attribute__ ((__packed__
));
132 * all non-leaf blocks are nodes, they hold only keys and pointers to
135 struct btrfs_key_ptr
{
136 struct btrfs_disk_key key
;
138 } __attribute__ ((__packed__
));
141 struct btrfs_header header
;
142 struct btrfs_key_ptr ptrs
[];
143 } __attribute__ ((__packed__
));
146 * btrfs_paths remember the path taken from the root down to the leaf.
147 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
148 * to any other levels that are present.
150 * The slots array records the index of the item or block pointer
151 * used while walking the tree.
154 struct buffer_head
*nodes
[BTRFS_MAX_LEVEL
];
155 int slots
[BTRFS_MAX_LEVEL
];
159 * items in the extent btree are used to record the objectid of the
160 * owner of the block and the number of references
162 struct btrfs_extent_item
{
165 } __attribute__ ((__packed__
));
167 struct btrfs_inode_timespec
{
170 } __attribute__ ((__packed__
));
173 * there is no padding here on purpose. If you want to extent the inode,
174 * make a new item type
176 struct btrfs_inode_item
{
188 struct btrfs_inode_timespec atime
;
189 struct btrfs_inode_timespec ctime
;
190 struct btrfs_inode_timespec mtime
;
191 struct btrfs_inode_timespec otime
;
192 } __attribute__ ((__packed__
));
194 struct btrfs_dir_item
{
195 struct btrfs_disk_key location
;
199 } __attribute__ ((__packed__
));
201 struct btrfs_root_item
{
202 struct btrfs_inode_item inode
;
209 } __attribute__ ((__packed__
));
211 #define BTRFS_FILE_EXTENT_REG 0
212 #define BTRFS_FILE_EXTENT_INLINE 1
214 struct btrfs_file_extent_item
{
218 * disk space consumed by the extent, checksum blocks are included
222 __le64 disk_num_blocks
;
224 * the logical offset in file blocks (no csums)
225 * this extent record is for. This allows a file extent to point
226 * into the middle of an existing extent on disk, sharing it
227 * between two snapshots (useful if some bytes in the middle of the
228 * extent have changed
232 * the logical number of file blocks (no csums included)
235 } __attribute__ ((__packed__
));
237 struct btrfs_csum_item
{
238 u8 csum
[BTRFS_CSUM_SIZE
];
239 } __attribute__ ((__packed__
));
241 struct btrfs_device_item
{
244 } __attribute__ ((__packed__
));
246 /* tag for the radix tree of block groups in ram */
247 #define BTRFS_BLOCK_GROUP_DIRTY 0
248 #define BTRFS_BLOCK_GROUP_AVAIL 1
249 #define BTRFS_BLOCK_GROUP_HINTS 8
250 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
251 struct btrfs_block_group_item
{
253 } __attribute__ ((__packed__
));
255 struct btrfs_block_group_cache
{
256 struct btrfs_key key
;
257 struct btrfs_block_group_item item
;
263 struct btrfs_fs_info
{
264 struct btrfs_root
*extent_root
;
265 struct btrfs_root
*tree_root
;
266 struct btrfs_root
*dev_root
;
267 struct btrfs_block_group_cache
*block_group_cache
;
268 struct radix_tree_root fs_roots_radix
;
269 struct radix_tree_root pending_del_radix
;
270 struct radix_tree_root pinned_radix
;
271 struct radix_tree_root dev_radix
;
272 struct radix_tree_root block_group_radix
;
274 u64 extent_tree_insert
[BTRFS_MAX_LEVEL
* 3];
275 int extent_tree_insert_nr
;
276 u64 extent_tree_prealloc
[BTRFS_MAX_LEVEL
* 3];
277 int extent_tree_prealloc_nr
;
280 struct btrfs_transaction
*running_transaction
;
281 struct btrfs_super_block
*disk_super
;
282 struct buffer_head
*sb_buffer
;
283 struct super_block
*sb
;
284 struct inode
*btree_inode
;
285 struct mutex trans_mutex
;
286 struct mutex fs_mutex
;
287 struct list_head trans_list
;
288 struct crypto_hash
*hash_tfm
;
289 spinlock_t hash_lock
;
295 * in ram representation of the tree. extent_root is used for all allocations
296 * and for the extent tree extent_root root.
299 struct buffer_head
*node
;
300 struct buffer_head
*commit_root
;
301 struct btrfs_root_item root_item
;
302 struct btrfs_key root_key
;
303 struct btrfs_fs_info
*fs_info
;
311 u64 last_inode_alloc
;
314 /* the lower bits in the key flags defines the item type */
315 #define BTRFS_KEY_TYPE_MAX 256
316 #define BTRFS_KEY_TYPE_SHIFT 24
317 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
318 BTRFS_KEY_TYPE_SHIFT)
321 * inode items have the data typically returned from stat and store other
322 * info about object characteristics. There is one for every file and dir in
325 #define BTRFS_INODE_ITEM_KEY 1
327 /* reserve 2-15 close to the inode for later flexibility */
330 * dir items are the name -> inode pointers in a directory. There is one
331 * for every name in a directory.
333 #define BTRFS_DIR_ITEM_KEY 16
334 #define BTRFS_DIR_INDEX_KEY 17
336 * extent data is for file data
338 #define BTRFS_EXTENT_DATA_KEY 18
340 * csum items have the checksums for data in the extents
342 #define BTRFS_CSUM_ITEM_KEY 19
344 /* reserve 20-31 for other file stuff */
347 * root items point to tree roots. There are typically in the root
348 * tree used by the super block to find all the other trees
350 #define BTRFS_ROOT_ITEM_KEY 32
352 * extent items are in the extent map tree. These record which blocks
353 * are used, and how many references there are to each block
355 #define BTRFS_EXTENT_ITEM_KEY 33
358 * block groups give us hints into the extent allocation trees. Which
359 * blocks are free etc etc
361 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
364 * dev items list the devices that make up the FS
366 #define BTRFS_DEV_ITEM_KEY 35
369 * string items are for debugging. They just store a short string of
372 #define BTRFS_STRING_ITEM_KEY 253
375 static inline u64
btrfs_block_group_used(struct btrfs_block_group_item
*bi
)
377 return le64_to_cpu(bi
->used
);
380 static inline void btrfs_set_block_group_used(struct
381 btrfs_block_group_item
*bi
,
384 bi
->used
= cpu_to_le64(val
);
387 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
389 return le64_to_cpu(i
->generation
);
392 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
395 i
->generation
= cpu_to_le64(val
);
398 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
400 return le64_to_cpu(i
->size
);
403 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
405 i
->size
= cpu_to_le64(val
);
408 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
410 return le64_to_cpu(i
->nblocks
);
413 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
415 i
->nblocks
= cpu_to_le64(val
);
418 static inline u64
btrfs_inode_block_group(struct btrfs_inode_item
*i
)
420 return le64_to_cpu(i
->block_group
);
423 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item
*i
,
426 i
->block_group
= cpu_to_le64(val
);
429 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
431 return le32_to_cpu(i
->nlink
);
434 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
436 i
->nlink
= cpu_to_le32(val
);
439 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
441 return le32_to_cpu(i
->uid
);
444 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
446 i
->uid
= cpu_to_le32(val
);
449 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
451 return le32_to_cpu(i
->gid
);
454 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
456 i
->gid
= cpu_to_le32(val
);
459 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
461 return le32_to_cpu(i
->mode
);
464 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
466 i
->mode
= cpu_to_le32(val
);
469 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
471 return le32_to_cpu(i
->rdev
);
474 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
476 i
->rdev
= cpu_to_le32(val
);
479 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
481 return le16_to_cpu(i
->flags
);
484 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
486 i
->flags
= cpu_to_le16(val
);
489 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
491 return le16_to_cpu(i
->compat_flags
);
494 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
497 i
->compat_flags
= cpu_to_le16(val
);
500 static inline u64
btrfs_timespec_sec(struct btrfs_inode_timespec
*ts
)
502 return le64_to_cpu(ts
->sec
);
505 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec
*ts
,
508 ts
->sec
= cpu_to_le64(val
);
511 static inline u32
btrfs_timespec_nsec(struct btrfs_inode_timespec
*ts
)
513 return le32_to_cpu(ts
->nsec
);
516 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec
*ts
,
519 ts
->nsec
= cpu_to_le32(val
);
522 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
524 return le32_to_cpu(ei
->refs
);
527 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
529 ei
->refs
= cpu_to_le32(val
);
532 static inline u64
btrfs_extent_owner(struct btrfs_extent_item
*ei
)
534 return le64_to_cpu(ei
->owner
);
537 static inline void btrfs_set_extent_owner(struct btrfs_extent_item
*ei
, u64 val
)
539 ei
->owner
= cpu_to_le64(val
);
542 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
544 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
548 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
551 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
554 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
556 return le32_to_cpu(item
->offset
);
559 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
561 item
->offset
= cpu_to_le32(val
);
564 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
566 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
569 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
571 return le16_to_cpu(item
->size
);
574 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
576 item
->size
= cpu_to_le16(val
);
579 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
581 return le16_to_cpu(d
->flags
);
584 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
586 d
->flags
= cpu_to_le16(val
);
589 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
594 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
599 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
601 return le16_to_cpu(d
->name_len
);
604 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
606 d
->name_len
= cpu_to_le16(val
);
609 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
610 struct btrfs_disk_key
*disk
)
612 cpu
->offset
= le64_to_cpu(disk
->offset
);
613 cpu
->flags
= le32_to_cpu(disk
->flags
);
614 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
617 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
618 struct btrfs_key
*cpu
)
620 disk
->offset
= cpu_to_le64(cpu
->offset
);
621 disk
->flags
= cpu_to_le32(cpu
->flags
);
622 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
625 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
627 return le64_to_cpu(disk
->objectid
);
630 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
633 disk
->objectid
= cpu_to_le64(val
);
636 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
638 return le64_to_cpu(disk
->offset
);
641 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
644 disk
->offset
= cpu_to_le64(val
);
647 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
649 return le32_to_cpu(disk
->flags
);
652 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
655 disk
->flags
= cpu_to_le32(val
);
658 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
660 return le32_to_cpu(key
->flags
) >> BTRFS_KEY_TYPE_SHIFT
;
663 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
,
666 u32 flags
= btrfs_disk_key_flags(key
);
667 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
668 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
669 flags
= (flags
& ~BTRFS_KEY_TYPE_MASK
) | val
;
670 btrfs_set_disk_key_flags(key
, flags
);
673 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
675 return key
->flags
>> BTRFS_KEY_TYPE_SHIFT
;
678 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 val
)
680 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
681 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
682 key
->flags
= (key
->flags
& ~(BTRFS_KEY_TYPE_MASK
)) | val
;
685 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
687 return le64_to_cpu(h
->blocknr
);
690 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
692 h
->blocknr
= cpu_to_le64(blocknr
);
695 static inline u64
btrfs_header_generation(struct btrfs_header
*h
)
697 return le64_to_cpu(h
->generation
);
700 static inline void btrfs_set_header_generation(struct btrfs_header
*h
,
703 h
->generation
= cpu_to_le64(val
);
706 static inline u64
btrfs_header_owner(struct btrfs_header
*h
)
708 return le64_to_cpu(h
->owner
);
711 static inline void btrfs_set_header_owner(struct btrfs_header
*h
,
714 h
->owner
= cpu_to_le64(val
);
717 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
719 return le16_to_cpu(h
->nritems
);
722 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
724 h
->nritems
= cpu_to_le16(val
);
727 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
729 return le16_to_cpu(h
->flags
);
732 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
734 h
->flags
= cpu_to_le16(val
);
737 static inline int btrfs_header_level(struct btrfs_header
*h
)
742 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
744 BUG_ON(level
> BTRFS_MAX_LEVEL
);
748 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
750 return (btrfs_header_level(&n
->header
) == 0);
753 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
755 return le64_to_cpu(item
->blocknr
);
758 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
760 item
->blocknr
= cpu_to_le64(val
);
763 static inline u64
btrfs_root_dirid(struct btrfs_root_item
*item
)
765 return le64_to_cpu(item
->root_dirid
);
768 static inline void btrfs_set_root_dirid(struct btrfs_root_item
*item
, u64 val
)
770 item
->root_dirid
= cpu_to_le64(val
);
773 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
775 return le32_to_cpu(item
->refs
);
778 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
780 item
->refs
= cpu_to_le32(val
);
783 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
785 return le64_to_cpu(s
->blocknr
);
788 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
790 s
->blocknr
= cpu_to_le64(val
);
793 static inline u64
btrfs_super_generation(struct btrfs_super_block
*s
)
795 return le64_to_cpu(s
->generation
);
798 static inline void btrfs_set_super_generation(struct btrfs_super_block
*s
,
801 s
->generation
= cpu_to_le64(val
);
804 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
806 return le64_to_cpu(s
->root
);
809 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
811 s
->root
= cpu_to_le64(val
);
814 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
816 return le64_to_cpu(s
->total_blocks
);
819 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
822 s
->total_blocks
= cpu_to_le64(val
);
825 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
827 return le64_to_cpu(s
->blocks_used
);
830 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
833 s
->blocks_used
= cpu_to_le64(val
);
836 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
838 return le32_to_cpu(s
->blocksize
);
841 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
844 s
->blocksize
= cpu_to_le32(val
);
847 static inline u64
btrfs_super_root_dir(struct btrfs_super_block
*s
)
849 return le64_to_cpu(s
->root_dir_objectid
);
852 static inline void btrfs_set_super_root_dir(struct btrfs_super_block
*s
, u64
855 s
->root_dir_objectid
= cpu_to_le64(val
);
858 static inline u64
btrfs_super_last_device_id(struct btrfs_super_block
*s
)
860 return le64_to_cpu(s
->last_device_id
);
863 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block
*s
,
866 s
->last_device_id
= cpu_to_le64(val
);
869 static inline u64
btrfs_super_device_id(struct btrfs_super_block
*s
)
871 return le64_to_cpu(s
->device_id
);
874 static inline void btrfs_set_super_device_id(struct btrfs_super_block
*s
,
877 s
->device_id
= cpu_to_le64(val
);
880 static inline u64
btrfs_super_device_block_start(struct btrfs_super_block
*s
)
882 return le64_to_cpu(s
->device_block_start
);
885 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
888 s
->device_block_start
= cpu_to_le64(val
);
891 static inline u64
btrfs_super_device_num_blocks(struct btrfs_super_block
*s
)
893 return le64_to_cpu(s
->device_num_blocks
);
896 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
899 s
->device_num_blocks
= cpu_to_le64(val
);
902 static inline u64
btrfs_super_device_root(struct btrfs_super_block
*s
)
904 return le64_to_cpu(s
->device_root
);
907 static inline void btrfs_set_super_device_root(struct btrfs_super_block
910 s
->device_root
= cpu_to_le64(val
);
914 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
916 return (u8
*)l
->items
;
919 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item
*e
)
923 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item
*e
,
929 static inline char *btrfs_file_extent_inline_start(struct
930 btrfs_file_extent_item
*e
)
932 return (char *)(&e
->disk_blocknr
);
935 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
937 return (unsigned long)(&((struct
938 btrfs_file_extent_item
*)NULL
)->disk_blocknr
) + datasize
;
941 static inline u32
btrfs_file_extent_inline_len(struct btrfs_item
*e
)
943 struct btrfs_file_extent_item
*fe
= NULL
;
944 return btrfs_item_size(e
) - (unsigned long)(&fe
->disk_blocknr
);
947 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
950 return le64_to_cpu(e
->disk_blocknr
);
953 static inline void btrfs_set_file_extent_disk_blocknr(struct
954 btrfs_file_extent_item
957 e
->disk_blocknr
= cpu_to_le64(val
);
960 static inline u64
btrfs_file_extent_generation(struct btrfs_file_extent_item
*e
)
962 return le64_to_cpu(e
->generation
);
965 static inline void btrfs_set_file_extent_generation(struct
966 btrfs_file_extent_item
*e
,
969 e
->generation
= cpu_to_le64(val
);
972 static inline u64
btrfs_file_extent_disk_num_blocks(struct
973 btrfs_file_extent_item
*e
)
975 return le64_to_cpu(e
->disk_num_blocks
);
978 static inline void btrfs_set_file_extent_disk_num_blocks(struct
979 btrfs_file_extent_item
982 e
->disk_num_blocks
= cpu_to_le64(val
);
985 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
987 return le64_to_cpu(e
->offset
);
990 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
993 e
->offset
= cpu_to_le64(val
);
996 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
999 return le64_to_cpu(e
->num_blocks
);
1002 static inline void btrfs_set_file_extent_num_blocks(struct
1003 btrfs_file_extent_item
*e
,
1006 e
->num_blocks
= cpu_to_le64(val
);
1009 static inline u16
btrfs_device_pathlen(struct btrfs_device_item
*d
)
1011 return le16_to_cpu(d
->pathlen
);
1014 static inline void btrfs_set_device_pathlen(struct btrfs_device_item
*d
,
1017 d
->pathlen
= cpu_to_le16(val
);
1020 static inline u64
btrfs_device_id(struct btrfs_device_item
*d
)
1022 return le64_to_cpu(d
->device_id
);
1025 static inline void btrfs_set_device_id(struct btrfs_device_item
*d
,
1028 d
->device_id
= cpu_to_le64(val
);
1031 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
1033 return sb
->s_fs_info
;
1036 static inline void btrfs_check_bounds(void *vptr
, size_t len
,
1037 void *vcontainer
, size_t container_len
)
1040 char *container
= vcontainer
;
1041 WARN_ON(ptr
< container
);
1042 WARN_ON(ptr
+ len
> container
+ container_len
);
1045 static inline void btrfs_memcpy(struct btrfs_root
*root
,
1047 void *dst
, const void *src
, size_t nr
)
1049 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
1050 memcpy(dst
, src
, nr
);
1053 static inline void btrfs_memmove(struct btrfs_root
*root
,
1055 void *dst
, void *src
, size_t nr
)
1057 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
1058 memmove(dst
, src
, nr
);
1061 static inline void btrfs_mark_buffer_dirty(struct buffer_head
*bh
)
1063 WARN_ON(!atomic_read(&bh
->b_count
));
1064 mark_buffer_dirty(bh
);
1067 /* helper function to cast into the data area of the leaf. */
1068 #define btrfs_item_ptr(leaf, slot, type) \
1069 ((type *)(btrfs_leaf_data(leaf) + \
1070 btrfs_item_offset((leaf)->items + (slot))))
1073 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
1074 struct btrfs_block_group_cache
1076 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
1077 struct btrfs_root
*root
);
1078 struct buffer_head
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
1079 struct btrfs_root
*root
, u64 hint
);
1080 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
1081 struct btrfs_root
*root
, u64 owner
,
1082 u64 num_blocks
, u64 search_start
,
1083 u64 search_end
, struct btrfs_key
*ins
, int data
);
1084 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1085 struct buffer_head
*buf
);
1086 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
1087 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
1088 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
, struct
1090 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1091 struct btrfs_root
*root
,
1092 u64 blocknr
, u64 num_blocks
);
1093 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
1094 struct btrfs_root
*root
);
1095 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
1096 int btrfs_read_block_groups(struct btrfs_root
*root
);
1098 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1099 *root
, struct btrfs_path
*path
, u32 data_size
);
1100 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
1101 struct btrfs_root
*root
,
1102 struct btrfs_path
*path
,
1104 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1105 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
1107 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
1108 struct btrfs_path
*btrfs_alloc_path(void);
1109 void btrfs_free_path(struct btrfs_path
*p
);
1110 void btrfs_init_path(struct btrfs_path
*p
);
1111 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1112 struct btrfs_path
*path
);
1113 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1114 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1115 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1116 *root
, struct btrfs_path
*path
, struct btrfs_key
1117 *cpu_key
, u32 data_size
);
1118 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1119 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
1120 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1121 *root
, struct buffer_head
*snap
);
1123 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1124 struct btrfs_key
*key
);
1125 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1126 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1128 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1129 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1131 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1132 btrfs_root_item
*item
, struct btrfs_key
*key
);
1134 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1135 *root
, const char *name
, int name_len
, u64 dir
,
1136 struct btrfs_key
*location
, u8 type
);
1137 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1138 struct btrfs_root
*root
,
1139 struct btrfs_path
*path
, u64 dir
,
1140 const char *name
, int name_len
,
1142 struct btrfs_dir_item
*
1143 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1144 struct btrfs_root
*root
,
1145 struct btrfs_path
*path
, u64 dir
,
1146 u64 objectid
, const char *name
, int name_len
,
1148 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1149 struct btrfs_path
*path
,
1150 const char *name
, int name_len
);
1151 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1152 struct btrfs_root
*root
,
1153 struct btrfs_path
*path
,
1154 struct btrfs_dir_item
*di
);
1156 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1157 struct btrfs_root
*fs_root
,
1158 u64 dirid
, u64
*objectid
);
1159 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1162 int btrfs_insert_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1163 *root
, u64 objectid
, struct btrfs_inode_item
1165 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1166 *root
, struct btrfs_path
*path
,
1167 struct btrfs_key
*location
, int mod
);
1170 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1171 struct btrfs_root
*root
,
1172 u64 objectid
, u64 pos
, u64 offset
,
1174 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1175 struct btrfs_root
*root
,
1176 struct btrfs_path
*path
, u64 objectid
,
1177 u64 blocknr
, int mod
);
1178 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1179 struct btrfs_root
*root
,
1180 u64 objectid
, u64 offset
,
1181 char *data
, size_t len
);
1182 int btrfs_csum_verify_file_block(struct btrfs_root
*root
,
1183 u64 objectid
, u64 offset
,
1184 char *data
, size_t len
);
1185 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1186 struct btrfs_root
*root
,
1187 struct btrfs_path
*path
,
1188 u64 objectid
, u64 offset
,
1191 extern struct subsystem btrfs_subsys
;