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
33 /* four bytes for CRC32 */
34 #define BTRFS_CRC32_SIZE 4
37 * the key defines the order in the tree, and so it also defines (optimal)
38 * block layout. objectid corresonds to the inode number. The flags
39 * tells us things about the object, and is a kind of stream selector.
40 * so for a given inode, keys with flags of 1 might refer to the inode
41 * data, flags of 2 may point to file data in the btree and flags == 3
42 * may point to extents.
44 * offset is the starting byte offset for this key in the stream.
46 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
47 * in cpu native order. Otherwise they are identical and their sizes
48 * should be the same (ie both packed)
50 struct btrfs_disk_key
{
54 } __attribute__ ((__packed__
));
60 } __attribute__ ((__packed__
));
63 * every tree block (leaf or node) starts with this header.
66 u8 csum
[BTRFS_CSUM_SIZE
];
67 u8 fsid
[16]; /* FS specific uuid */
68 __le64 blocknr
; /* which block this node is supposed to live in */
74 } __attribute__ ((__packed__
));
76 #define BTRFS_MAX_LEVEL 8
77 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
78 sizeof(struct btrfs_header)) / \
79 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
80 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
81 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
82 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
83 sizeof(struct btrfs_item) - \
84 sizeof(struct btrfs_file_extent_item))
88 * the super block basically lists the main trees of the FS
89 * it currently lacks any block count etc etc
91 struct btrfs_super_block
{
92 u8 csum
[BTRFS_CSUM_SIZE
];
93 /* the first 3 fields must match struct btrfs_header */
94 u8 fsid
[16]; /* FS specific uuid */
95 __le64 blocknr
; /* this block number */
102 __le64 root_dir_objectid
;
103 __le64 last_device_id
;
104 /* fields below here vary with the underlying disk */
105 __le64 device_block_start
;
106 __le64 device_num_blocks
;
109 } __attribute__ ((__packed__
));
112 * A leaf is full of items. offset and size tell us where to find
113 * the item in the leaf (relative to the start of the data area)
116 struct btrfs_disk_key key
;
119 } __attribute__ ((__packed__
));
122 * leaves have an item area and a data area:
123 * [item0, item1....itemN] [free space] [dataN...data1, data0]
125 * The data is separate from the items to get the keys closer together
129 struct btrfs_header header
;
130 struct btrfs_item items
[];
131 } __attribute__ ((__packed__
));
134 * all non-leaf blocks are nodes, they hold only keys and pointers to
137 struct btrfs_key_ptr
{
138 struct btrfs_disk_key key
;
140 } __attribute__ ((__packed__
));
143 struct btrfs_header header
;
144 struct btrfs_key_ptr ptrs
[];
145 } __attribute__ ((__packed__
));
148 * btrfs_paths remember the path taken from the root down to the leaf.
149 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
150 * to any other levels that are present.
152 * The slots array records the index of the item or block pointer
153 * used while walking the tree.
156 struct buffer_head
*nodes
[BTRFS_MAX_LEVEL
];
157 int slots
[BTRFS_MAX_LEVEL
];
161 * items in the extent btree are used to record the objectid of the
162 * owner of the block and the number of references
164 struct btrfs_extent_item
{
167 } __attribute__ ((__packed__
));
169 struct btrfs_inode_timespec
{
172 } __attribute__ ((__packed__
));
175 * there is no padding here on purpose. If you want to extent the inode,
176 * make a new item type
178 struct btrfs_inode_item
{
190 struct btrfs_inode_timespec atime
;
191 struct btrfs_inode_timespec ctime
;
192 struct btrfs_inode_timespec mtime
;
193 struct btrfs_inode_timespec otime
;
194 } __attribute__ ((__packed__
));
196 struct btrfs_dir_item
{
197 struct btrfs_disk_key location
;
201 } __attribute__ ((__packed__
));
203 struct btrfs_root_item
{
204 struct btrfs_inode_item inode
;
211 } __attribute__ ((__packed__
));
213 #define BTRFS_FILE_EXTENT_REG 0
214 #define BTRFS_FILE_EXTENT_INLINE 1
216 struct btrfs_file_extent_item
{
220 * disk space consumed by the extent, checksum blocks are included
224 __le64 disk_num_blocks
;
226 * the logical offset in file blocks (no csums)
227 * this extent record is for. This allows a file extent to point
228 * into the middle of an existing extent on disk, sharing it
229 * between two snapshots (useful if some bytes in the middle of the
230 * extent have changed
234 * the logical number of file blocks (no csums included)
237 } __attribute__ ((__packed__
));
239 struct btrfs_csum_item
{
241 } __attribute__ ((__packed__
));
243 struct btrfs_device_item
{
246 } __attribute__ ((__packed__
));
248 /* tag for the radix tree of block groups in ram */
249 #define BTRFS_BLOCK_GROUP_DIRTY 0
250 #define BTRFS_BLOCK_GROUP_AVAIL 1
251 #define BTRFS_BLOCK_GROUP_HINTS 8
252 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
253 struct btrfs_block_group_item
{
255 } __attribute__ ((__packed__
));
257 struct btrfs_block_group_cache
{
258 struct btrfs_key key
;
259 struct btrfs_block_group_item item
;
260 struct radix_tree_root
*radix
;
270 struct btrfs_fs_info
{
271 struct btrfs_root
*extent_root
;
272 struct btrfs_root
*tree_root
;
273 struct btrfs_root
*dev_root
;
274 struct radix_tree_root fs_roots_radix
;
275 struct radix_tree_root pending_del_radix
;
276 struct radix_tree_root pinned_radix
;
277 struct radix_tree_root dev_radix
;
278 struct radix_tree_root block_group_radix
;
279 struct radix_tree_root block_group_data_radix
;
280 struct radix_tree_root extent_map_radix
;
282 u64 extent_tree_insert
[BTRFS_MAX_LEVEL
* 3];
283 int extent_tree_insert_nr
;
284 u64 extent_tree_prealloc
[BTRFS_MAX_LEVEL
* 3];
285 int extent_tree_prealloc_nr
;
288 struct btrfs_transaction
*running_transaction
;
289 struct btrfs_super_block
*disk_super
;
290 struct buffer_head
*sb_buffer
;
291 struct super_block
*sb
;
292 struct inode
*btree_inode
;
293 struct mutex trans_mutex
;
294 struct mutex fs_mutex
;
295 struct list_head trans_list
;
296 struct crypto_hash
*hash_tfm
;
297 spinlock_t hash_lock
;
303 * in ram representation of the tree. extent_root is used for all allocations
304 * and for the extent tree extent_root root.
307 struct buffer_head
*node
;
308 struct buffer_head
*commit_root
;
309 struct btrfs_root_item root_item
;
310 struct btrfs_key root_key
;
311 struct btrfs_fs_info
*fs_info
;
319 u64 last_inode_alloc
;
322 /* the lower bits in the key flags defines the item type */
323 #define BTRFS_KEY_TYPE_MAX 256
324 #define BTRFS_KEY_TYPE_SHIFT 24
325 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
326 BTRFS_KEY_TYPE_SHIFT)
329 * inode items have the data typically returned from stat and store other
330 * info about object characteristics. There is one for every file and dir in
333 #define BTRFS_INODE_ITEM_KEY 1
335 /* reserve 2-15 close to the inode for later flexibility */
338 * dir items are the name -> inode pointers in a directory. There is one
339 * for every name in a directory.
341 #define BTRFS_DIR_ITEM_KEY 16
342 #define BTRFS_DIR_INDEX_KEY 17
344 * extent data is for file data
346 #define BTRFS_EXTENT_DATA_KEY 18
348 * csum items have the checksums for data in the extents
350 #define BTRFS_CSUM_ITEM_KEY 19
352 /* reserve 20-31 for other file stuff */
355 * root items point to tree roots. There are typically in the root
356 * tree used by the super block to find all the other trees
358 #define BTRFS_ROOT_ITEM_KEY 32
360 * extent items are in the extent map tree. These record which blocks
361 * are used, and how many references there are to each block
363 #define BTRFS_EXTENT_ITEM_KEY 33
366 * block groups give us hints into the extent allocation trees. Which
367 * blocks are free etc etc
369 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
372 * dev items list the devices that make up the FS
374 #define BTRFS_DEV_ITEM_KEY 35
377 * string items are for debugging. They just store a short string of
380 #define BTRFS_STRING_ITEM_KEY 253
383 static inline u64
btrfs_block_group_used(struct btrfs_block_group_item
*bi
)
385 return le64_to_cpu(bi
->used
);
388 static inline void btrfs_set_block_group_used(struct
389 btrfs_block_group_item
*bi
,
392 bi
->used
= cpu_to_le64(val
);
395 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
397 return le64_to_cpu(i
->generation
);
400 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
403 i
->generation
= cpu_to_le64(val
);
406 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
408 return le64_to_cpu(i
->size
);
411 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
413 i
->size
= cpu_to_le64(val
);
416 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
418 return le64_to_cpu(i
->nblocks
);
421 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
423 i
->nblocks
= cpu_to_le64(val
);
426 static inline u64
btrfs_inode_block_group(struct btrfs_inode_item
*i
)
428 return le64_to_cpu(i
->block_group
);
431 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item
*i
,
434 i
->block_group
= cpu_to_le64(val
);
437 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
439 return le32_to_cpu(i
->nlink
);
442 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
444 i
->nlink
= cpu_to_le32(val
);
447 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
449 return le32_to_cpu(i
->uid
);
452 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
454 i
->uid
= cpu_to_le32(val
);
457 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
459 return le32_to_cpu(i
->gid
);
462 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
464 i
->gid
= cpu_to_le32(val
);
467 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
469 return le32_to_cpu(i
->mode
);
472 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
474 i
->mode
= cpu_to_le32(val
);
477 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
479 return le32_to_cpu(i
->rdev
);
482 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
484 i
->rdev
= cpu_to_le32(val
);
487 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
489 return le16_to_cpu(i
->flags
);
492 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
494 i
->flags
= cpu_to_le16(val
);
497 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
499 return le16_to_cpu(i
->compat_flags
);
502 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
505 i
->compat_flags
= cpu_to_le16(val
);
508 static inline u64
btrfs_timespec_sec(struct btrfs_inode_timespec
*ts
)
510 return le64_to_cpu(ts
->sec
);
513 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec
*ts
,
516 ts
->sec
= cpu_to_le64(val
);
519 static inline u32
btrfs_timespec_nsec(struct btrfs_inode_timespec
*ts
)
521 return le32_to_cpu(ts
->nsec
);
524 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec
*ts
,
527 ts
->nsec
= cpu_to_le32(val
);
530 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
532 return le32_to_cpu(ei
->refs
);
535 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
537 ei
->refs
= cpu_to_le32(val
);
540 static inline u64
btrfs_extent_owner(struct btrfs_extent_item
*ei
)
542 return le64_to_cpu(ei
->owner
);
545 static inline void btrfs_set_extent_owner(struct btrfs_extent_item
*ei
, u64 val
)
547 ei
->owner
= cpu_to_le64(val
);
550 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
552 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
556 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
559 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
562 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
564 return le32_to_cpu(item
->offset
);
567 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
569 item
->offset
= cpu_to_le32(val
);
572 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
574 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
577 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
579 return le16_to_cpu(item
->size
);
582 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
584 item
->size
= cpu_to_le16(val
);
587 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
589 return le16_to_cpu(d
->flags
);
592 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
594 d
->flags
= cpu_to_le16(val
);
597 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
602 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
607 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
609 return le16_to_cpu(d
->name_len
);
612 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
614 d
->name_len
= cpu_to_le16(val
);
617 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
618 struct btrfs_disk_key
*disk
)
620 cpu
->offset
= le64_to_cpu(disk
->offset
);
621 cpu
->flags
= le32_to_cpu(disk
->flags
);
622 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
625 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
626 struct btrfs_key
*cpu
)
628 disk
->offset
= cpu_to_le64(cpu
->offset
);
629 disk
->flags
= cpu_to_le32(cpu
->flags
);
630 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
633 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
635 return le64_to_cpu(disk
->objectid
);
638 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
641 disk
->objectid
= cpu_to_le64(val
);
644 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
646 return le64_to_cpu(disk
->offset
);
649 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
652 disk
->offset
= cpu_to_le64(val
);
655 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
657 return le32_to_cpu(disk
->flags
);
660 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
663 disk
->flags
= cpu_to_le32(val
);
666 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
668 return le32_to_cpu(key
->flags
) >> BTRFS_KEY_TYPE_SHIFT
;
671 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
,
674 u32 flags
= btrfs_disk_key_flags(key
);
675 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
676 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
677 flags
= (flags
& ~BTRFS_KEY_TYPE_MASK
) | val
;
678 btrfs_set_disk_key_flags(key
, flags
);
681 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
683 return key
->flags
>> BTRFS_KEY_TYPE_SHIFT
;
686 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 val
)
688 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
689 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
690 key
->flags
= (key
->flags
& ~(BTRFS_KEY_TYPE_MASK
)) | val
;
693 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
695 return le64_to_cpu(h
->blocknr
);
698 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
700 h
->blocknr
= cpu_to_le64(blocknr
);
703 static inline u64
btrfs_header_generation(struct btrfs_header
*h
)
705 return le64_to_cpu(h
->generation
);
708 static inline void btrfs_set_header_generation(struct btrfs_header
*h
,
711 h
->generation
= cpu_to_le64(val
);
714 static inline u64
btrfs_header_owner(struct btrfs_header
*h
)
716 return le64_to_cpu(h
->owner
);
719 static inline void btrfs_set_header_owner(struct btrfs_header
*h
,
722 h
->owner
= cpu_to_le64(val
);
725 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
727 return le16_to_cpu(h
->nritems
);
730 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
732 h
->nritems
= cpu_to_le16(val
);
735 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
737 return le16_to_cpu(h
->flags
);
740 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
742 h
->flags
= cpu_to_le16(val
);
745 static inline int btrfs_header_level(struct btrfs_header
*h
)
750 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
752 BUG_ON(level
> BTRFS_MAX_LEVEL
);
756 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
758 return (btrfs_header_level(&n
->header
) == 0);
761 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
763 return le64_to_cpu(item
->blocknr
);
766 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
768 item
->blocknr
= cpu_to_le64(val
);
771 static inline u64
btrfs_root_dirid(struct btrfs_root_item
*item
)
773 return le64_to_cpu(item
->root_dirid
);
776 static inline void btrfs_set_root_dirid(struct btrfs_root_item
*item
, u64 val
)
778 item
->root_dirid
= cpu_to_le64(val
);
781 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
783 return le32_to_cpu(item
->refs
);
786 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
788 item
->refs
= cpu_to_le32(val
);
791 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
793 return le64_to_cpu(s
->blocknr
);
796 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
798 s
->blocknr
= cpu_to_le64(val
);
801 static inline u64
btrfs_super_generation(struct btrfs_super_block
*s
)
803 return le64_to_cpu(s
->generation
);
806 static inline void btrfs_set_super_generation(struct btrfs_super_block
*s
,
809 s
->generation
= cpu_to_le64(val
);
812 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
814 return le64_to_cpu(s
->root
);
817 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
819 s
->root
= cpu_to_le64(val
);
822 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
824 return le64_to_cpu(s
->total_blocks
);
827 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
830 s
->total_blocks
= cpu_to_le64(val
);
833 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
835 return le64_to_cpu(s
->blocks_used
);
838 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
841 s
->blocks_used
= cpu_to_le64(val
);
844 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
846 return le32_to_cpu(s
->blocksize
);
849 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
852 s
->blocksize
= cpu_to_le32(val
);
855 static inline u64
btrfs_super_root_dir(struct btrfs_super_block
*s
)
857 return le64_to_cpu(s
->root_dir_objectid
);
860 static inline void btrfs_set_super_root_dir(struct btrfs_super_block
*s
, u64
863 s
->root_dir_objectid
= cpu_to_le64(val
);
866 static inline u64
btrfs_super_last_device_id(struct btrfs_super_block
*s
)
868 return le64_to_cpu(s
->last_device_id
);
871 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block
*s
,
874 s
->last_device_id
= cpu_to_le64(val
);
877 static inline u64
btrfs_super_device_id(struct btrfs_super_block
*s
)
879 return le64_to_cpu(s
->device_id
);
882 static inline void btrfs_set_super_device_id(struct btrfs_super_block
*s
,
885 s
->device_id
= cpu_to_le64(val
);
888 static inline u64
btrfs_super_device_block_start(struct btrfs_super_block
*s
)
890 return le64_to_cpu(s
->device_block_start
);
893 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
896 s
->device_block_start
= cpu_to_le64(val
);
899 static inline u64
btrfs_super_device_num_blocks(struct btrfs_super_block
*s
)
901 return le64_to_cpu(s
->device_num_blocks
);
904 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
907 s
->device_num_blocks
= cpu_to_le64(val
);
910 static inline u64
btrfs_super_device_root(struct btrfs_super_block
*s
)
912 return le64_to_cpu(s
->device_root
);
915 static inline void btrfs_set_super_device_root(struct btrfs_super_block
918 s
->device_root
= cpu_to_le64(val
);
922 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
924 return (u8
*)l
->items
;
927 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item
*e
)
931 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item
*e
,
937 static inline char *btrfs_file_extent_inline_start(struct
938 btrfs_file_extent_item
*e
)
940 return (char *)(&e
->disk_blocknr
);
943 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
945 return (unsigned long)(&((struct
946 btrfs_file_extent_item
*)NULL
)->disk_blocknr
) + datasize
;
949 static inline u32
btrfs_file_extent_inline_len(struct btrfs_item
*e
)
951 struct btrfs_file_extent_item
*fe
= NULL
;
952 return btrfs_item_size(e
) - (unsigned long)(&fe
->disk_blocknr
);
955 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
958 return le64_to_cpu(e
->disk_blocknr
);
961 static inline void btrfs_set_file_extent_disk_blocknr(struct
962 btrfs_file_extent_item
965 e
->disk_blocknr
= cpu_to_le64(val
);
968 static inline u64
btrfs_file_extent_generation(struct btrfs_file_extent_item
*e
)
970 return le64_to_cpu(e
->generation
);
973 static inline void btrfs_set_file_extent_generation(struct
974 btrfs_file_extent_item
*e
,
977 e
->generation
= cpu_to_le64(val
);
980 static inline u64
btrfs_file_extent_disk_num_blocks(struct
981 btrfs_file_extent_item
*e
)
983 return le64_to_cpu(e
->disk_num_blocks
);
986 static inline void btrfs_set_file_extent_disk_num_blocks(struct
987 btrfs_file_extent_item
990 e
->disk_num_blocks
= cpu_to_le64(val
);
993 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
995 return le64_to_cpu(e
->offset
);
998 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
1001 e
->offset
= cpu_to_le64(val
);
1004 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
1007 return le64_to_cpu(e
->num_blocks
);
1010 static inline void btrfs_set_file_extent_num_blocks(struct
1011 btrfs_file_extent_item
*e
,
1014 e
->num_blocks
= cpu_to_le64(val
);
1017 static inline u16
btrfs_device_pathlen(struct btrfs_device_item
*d
)
1019 return le16_to_cpu(d
->pathlen
);
1022 static inline void btrfs_set_device_pathlen(struct btrfs_device_item
*d
,
1025 d
->pathlen
= cpu_to_le16(val
);
1028 static inline u64
btrfs_device_id(struct btrfs_device_item
*d
)
1030 return le64_to_cpu(d
->device_id
);
1033 static inline void btrfs_set_device_id(struct btrfs_device_item
*d
,
1036 d
->device_id
= cpu_to_le64(val
);
1039 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
1041 return sb
->s_fs_info
;
1044 static inline void btrfs_check_bounds(void *vptr
, size_t len
,
1045 void *vcontainer
, size_t container_len
)
1048 char *container
= vcontainer
;
1049 WARN_ON(ptr
< container
);
1050 WARN_ON(ptr
+ len
> container
+ container_len
);
1053 static inline void btrfs_memcpy(struct btrfs_root
*root
,
1055 void *dst
, const void *src
, size_t nr
)
1057 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
1058 memcpy(dst
, src
, nr
);
1061 static inline void btrfs_memmove(struct btrfs_root
*root
,
1063 void *dst
, void *src
, size_t nr
)
1065 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
1066 memmove(dst
, src
, nr
);
1069 static inline void btrfs_mark_buffer_dirty(struct buffer_head
*bh
)
1071 WARN_ON(!atomic_read(&bh
->b_count
));
1072 mark_buffer_dirty(bh
);
1075 /* helper function to cast into the data area of the leaf. */
1076 #define btrfs_item_ptr(leaf, slot, type) \
1077 ((type *)(btrfs_leaf_data(leaf) + \
1078 btrfs_item_offset((leaf)->items + (slot))))
1081 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
1082 struct btrfs_block_group_cache
1083 *hint
, u64 search_start
,
1084 int data
, int owner
);
1085 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
1086 struct btrfs_root
*root
);
1087 struct buffer_head
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
1088 struct btrfs_root
*root
, u64 hint
);
1089 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
1090 struct btrfs_root
*root
, u64 owner
,
1091 u64 num_blocks
, u64 search_start
,
1092 u64 search_end
, struct btrfs_key
*ins
, int data
);
1093 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1094 struct buffer_head
*buf
);
1095 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
1096 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
1097 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
, struct
1099 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1100 struct btrfs_root
*root
,
1101 u64 blocknr
, u64 num_blocks
);
1102 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
1103 struct btrfs_root
*root
);
1104 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
1105 int btrfs_read_block_groups(struct btrfs_root
*root
);
1107 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1108 *root
, struct btrfs_path
*path
, u32 data_size
);
1109 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
1110 struct btrfs_root
*root
,
1111 struct btrfs_path
*path
,
1113 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1114 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
1116 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
1117 struct btrfs_path
*btrfs_alloc_path(void);
1118 void btrfs_free_path(struct btrfs_path
*p
);
1119 void btrfs_init_path(struct btrfs_path
*p
);
1120 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1121 struct btrfs_path
*path
);
1122 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1123 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1124 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1125 *root
, struct btrfs_path
*path
, struct btrfs_key
1126 *cpu_key
, u32 data_size
);
1127 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1128 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
1129 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1130 *root
, struct buffer_head
*snap
);
1132 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1133 struct btrfs_key
*key
);
1134 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1135 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1137 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1138 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1140 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1141 btrfs_root_item
*item
, struct btrfs_key
*key
);
1143 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1144 *root
, const char *name
, int name_len
, u64 dir
,
1145 struct btrfs_key
*location
, u8 type
);
1146 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1147 struct btrfs_root
*root
,
1148 struct btrfs_path
*path
, u64 dir
,
1149 const char *name
, int name_len
,
1151 struct btrfs_dir_item
*
1152 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1153 struct btrfs_root
*root
,
1154 struct btrfs_path
*path
, u64 dir
,
1155 u64 objectid
, const char *name
, int name_len
,
1157 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1158 struct btrfs_path
*path
,
1159 const char *name
, int name_len
);
1160 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1161 struct btrfs_root
*root
,
1162 struct btrfs_path
*path
,
1163 struct btrfs_dir_item
*di
);
1165 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1166 struct btrfs_root
*fs_root
,
1167 u64 dirid
, u64
*objectid
);
1168 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1171 int btrfs_insert_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1172 *root
, u64 objectid
, struct btrfs_inode_item
1174 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1175 *root
, struct btrfs_path
*path
,
1176 struct btrfs_key
*location
, int mod
);
1179 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1180 struct btrfs_root
*root
,
1181 u64 objectid
, u64 pos
, u64 offset
,
1183 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1184 struct btrfs_root
*root
,
1185 struct btrfs_path
*path
, u64 objectid
,
1186 u64 blocknr
, int mod
);
1187 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1188 struct btrfs_root
*root
,
1189 u64 objectid
, u64 offset
,
1190 char *data
, size_t len
);
1191 int btrfs_csum_verify_file_block(struct btrfs_root
*root
,
1192 u64 objectid
, u64 offset
,
1193 char *data
, size_t len
);
1194 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1195 struct btrfs_root
*root
,
1196 struct btrfs_path
*path
,
1197 u64 objectid
, u64 offset
,
1200 extern struct subsystem btrfs_subsys
;