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_EXTENT_TREE_OBJECTID 2ULL
17 #define BTRFS_INODE_MAP_OBJECTID 3ULL
18 #define BTRFS_FS_TREE_OBJECTID 4ULL
19 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
22 * we can actually store much bigger names, but lets not confuse the rest
25 #define BTRFS_NAME_LEN 255
27 /* 32 bytes in various csum fields */
28 #define BTRFS_CSUM_SIZE 32
31 * the key defines the order in the tree, and so it also defines (optimal)
32 * block layout. objectid corresonds to the inode number. The flags
33 * tells us things about the object, and is a kind of stream selector.
34 * so for a given inode, keys with flags of 1 might refer to the inode
35 * data, flags of 2 may point to file data in the btree and flags == 3
36 * may point to extents.
38 * offset is the starting byte offset for this key in the stream.
40 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
41 * in cpu native order. Otherwise they are identical and their sizes
42 * should be the same (ie both packed)
44 struct btrfs_disk_key
{
48 } __attribute__ ((__packed__
));
54 } __attribute__ ((__packed__
));
57 * every tree block (leaf or node) starts with this header.
60 u8 csum
[BTRFS_CSUM_SIZE
];
61 u8 fsid
[16]; /* FS specific uuid */
62 __le64 blocknr
; /* which block this node is supposed to live in */
64 __le64 parentid
; /* objectid of the tree root */
69 } __attribute__ ((__packed__
));
71 #define BTRFS_MAX_LEVEL 8
72 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
73 sizeof(struct btrfs_header)) / \
74 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
75 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
76 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
80 * the super block basically lists the main trees of the FS
81 * it currently lacks any block count etc etc
83 struct btrfs_super_block
{
84 u8 csum
[BTRFS_CSUM_SIZE
];
85 /* the first 3 fields must match struct btrfs_header */
86 u8 fsid
[16]; /* FS specific uuid */
87 __le64 blocknr
; /* this block number */
94 __le64 root_dir_objectid
;
95 } __attribute__ ((__packed__
));
98 * A leaf is full of items. offset and size tell us where to find
99 * the item in the leaf (relative to the start of the data area)
102 struct btrfs_disk_key key
;
105 } __attribute__ ((__packed__
));
108 * leaves have an item area and a data area:
109 * [item0, item1....itemN] [free space] [dataN...data1, data0]
111 * The data is separate from the items to get the keys closer together
115 struct btrfs_header header
;
116 struct btrfs_item items
[];
117 } __attribute__ ((__packed__
));
120 * all non-leaf blocks are nodes, they hold only keys and pointers to
123 struct btrfs_key_ptr
{
124 struct btrfs_disk_key key
;
126 } __attribute__ ((__packed__
));
129 struct btrfs_header header
;
130 struct btrfs_key_ptr ptrs
[];
131 } __attribute__ ((__packed__
));
134 * btrfs_paths remember the path taken from the root down to the leaf.
135 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
136 * to any other levels that are present.
138 * The slots array records the index of the item or block pointer
139 * used while walking the tree.
142 struct buffer_head
*nodes
[BTRFS_MAX_LEVEL
];
143 int slots
[BTRFS_MAX_LEVEL
];
147 * items in the extent btree are used to record the objectid of the
148 * owner of the block and the number of references
150 struct btrfs_extent_item
{
153 } __attribute__ ((__packed__
));
155 struct btrfs_inode_timespec
{
158 } __attribute__ ((__packed__
));
161 * there is no padding here on purpose. If you want to extent the inode,
162 * make a new item type
164 struct btrfs_inode_item
{
175 struct btrfs_inode_timespec atime
;
176 struct btrfs_inode_timespec ctime
;
177 struct btrfs_inode_timespec mtime
;
178 struct btrfs_inode_timespec otime
;
179 } __attribute__ ((__packed__
));
181 /* inline data is just a blob of bytes */
182 struct btrfs_inline_data_item
{
184 } __attribute__ ((__packed__
));
186 struct btrfs_dir_item
{
187 struct btrfs_disk_key location
;
191 } __attribute__ ((__packed__
));
193 struct btrfs_root_item
{
194 struct btrfs_inode_item inode
;
201 } __attribute__ ((__packed__
));
203 struct btrfs_file_extent_item
{
206 * disk space consumed by the extent, checksum blocks are included
210 __le64 disk_num_blocks
;
212 * the logical offset in file blocks (no csums)
213 * this extent record is for. This allows a file extent to point
214 * into the middle of an existing extent on disk, sharing it
215 * between two snapshots (useful if some bytes in the middle of the
216 * extent have changed
220 * the logical number of file blocks (no csums included)
223 } __attribute__ ((__packed__
));
225 struct btrfs_csum_item
{
226 u8 csum
[BTRFS_CSUM_SIZE
];
227 } __attribute__ ((__packed__
));
229 struct btrfs_inode_map_item
{
230 struct btrfs_disk_key key
;
231 } __attribute__ ((__packed__
));
234 struct btrfs_fs_info
{
235 struct btrfs_root
*extent_root
;
236 struct btrfs_root
*tree_root
;
237 struct btrfs_root
*inode_root
;
238 struct btrfs_key current_insert
;
239 struct btrfs_key last_insert
;
240 struct radix_tree_root fs_roots_radix
;
241 struct radix_tree_root pending_del_radix
;
242 struct radix_tree_root pinned_radix
;
243 u64 last_inode_alloc
;
246 struct btrfs_transaction
*running_transaction
;
247 struct btrfs_super_block
*disk_super
;
248 struct buffer_head
*sb_buffer
;
249 struct super_block
*sb
;
250 struct inode
*btree_inode
;
251 struct mutex trans_mutex
;
252 struct mutex fs_mutex
;
253 struct crypto_hash
*hash_tfm
;
254 spinlock_t hash_lock
;
259 * in ram representation of the tree. extent_root is used for all allocations
260 * and for the extent tree extent_root root. current_insert is used
261 * only for the extent tree.
264 struct buffer_head
*node
;
265 struct buffer_head
*commit_root
;
266 struct btrfs_root_item root_item
;
267 struct btrfs_key root_key
;
268 struct btrfs_fs_info
*fs_info
;
277 /* the lower bits in the key flags defines the item type */
278 #define BTRFS_KEY_TYPE_MAX 256
279 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
281 #define BTRFS_KEY_OVERFLOW_MAX 128
282 #define BTRFS_KEY_OVERFLOW_SHIFT 8
283 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
286 * inode items have the data typically returned from stat and store other
287 * info about object characteristics. There is one for every file and dir in
290 #define BTRFS_INODE_ITEM_KEY 1
293 * dir items are the name -> inode pointers in a directory. There is one
294 * for every name in a directory.
296 #define BTRFS_DIR_ITEM_KEY 2
297 #define BTRFS_DIR_INDEX_KEY 3
299 * inline data is file data that fits in the btree.
301 #define BTRFS_INLINE_DATA_KEY 4
303 * extent data is for data that can't fit in the btree. It points to
304 * a (hopefully) huge chunk of disk
306 #define BTRFS_EXTENT_DATA_KEY 5
308 * csum items have the checksums for data in the extents
310 #define BTRFS_CSUM_ITEM_KEY 6
313 * root items point to tree roots. There are typically in the root
314 * tree used by the super block to find all the other trees
316 #define BTRFS_ROOT_ITEM_KEY 7
318 * extent items are in the extent map tree. These record which blocks
319 * are used, and how many references there are to each block
321 #define BTRFS_EXTENT_ITEM_KEY 8
324 * the inode map records which inode numbers are in use and where
325 * they actually live on disk
327 #define BTRFS_INODE_MAP_ITEM_KEY 9
329 * string items are for debugging. They just store a short string of
332 #define BTRFS_STRING_ITEM_KEY 10
334 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
336 return le64_to_cpu(i
->generation
);
339 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
342 i
->generation
= cpu_to_le64(val
);
345 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
347 return le64_to_cpu(i
->size
);
350 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
352 i
->size
= cpu_to_le64(val
);
355 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
357 return le64_to_cpu(i
->nblocks
);
360 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
362 i
->nblocks
= cpu_to_le64(val
);
365 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
367 return le32_to_cpu(i
->nlink
);
370 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
372 i
->nlink
= cpu_to_le32(val
);
375 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
377 return le32_to_cpu(i
->uid
);
380 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
382 i
->uid
= cpu_to_le32(val
);
385 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
387 return le32_to_cpu(i
->gid
);
390 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
392 i
->gid
= cpu_to_le32(val
);
395 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
397 return le32_to_cpu(i
->mode
);
400 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
402 i
->mode
= cpu_to_le32(val
);
405 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
407 return le32_to_cpu(i
->rdev
);
410 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
412 i
->rdev
= cpu_to_le32(val
);
415 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
417 return le16_to_cpu(i
->flags
);
420 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
422 i
->flags
= cpu_to_le16(val
);
425 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
427 return le16_to_cpu(i
->compat_flags
);
430 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
433 i
->compat_flags
= cpu_to_le16(val
);
436 static inline u64
btrfs_timespec_sec(struct btrfs_inode_timespec
*ts
)
438 return le64_to_cpu(ts
->sec
);
441 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec
*ts
,
444 ts
->sec
= cpu_to_le64(val
);
447 static inline u32
btrfs_timespec_nsec(struct btrfs_inode_timespec
*ts
)
449 return le32_to_cpu(ts
->nsec
);
452 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec
*ts
,
455 ts
->nsec
= cpu_to_le32(val
);
458 static inline u64
btrfs_extent_owner(struct btrfs_extent_item
*ei
)
460 return le64_to_cpu(ei
->owner
);
463 static inline void btrfs_set_extent_owner(struct btrfs_extent_item
*ei
, u64 val
)
465 ei
->owner
= cpu_to_le64(val
);
468 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
470 return le32_to_cpu(ei
->refs
);
473 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
475 ei
->refs
= cpu_to_le32(val
);
478 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
480 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
483 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
486 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
489 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
491 return le32_to_cpu(item
->offset
);
494 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
496 item
->offset
= cpu_to_le32(val
);
499 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
501 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
504 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
506 return le16_to_cpu(item
->size
);
509 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
511 item
->size
= cpu_to_le16(val
);
514 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
516 return le16_to_cpu(d
->flags
);
519 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
521 d
->flags
= cpu_to_le16(val
);
524 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
529 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
534 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
536 return le16_to_cpu(d
->name_len
);
539 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
541 d
->name_len
= cpu_to_le16(val
);
544 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
545 struct btrfs_disk_key
*disk
)
547 cpu
->offset
= le64_to_cpu(disk
->offset
);
548 cpu
->flags
= le32_to_cpu(disk
->flags
);
549 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
552 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
553 struct btrfs_key
*cpu
)
555 disk
->offset
= cpu_to_le64(cpu
->offset
);
556 disk
->flags
= cpu_to_le32(cpu
->flags
);
557 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
560 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
562 return le64_to_cpu(disk
->objectid
);
565 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
568 disk
->objectid
= cpu_to_le64(val
);
571 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
573 return le64_to_cpu(disk
->offset
);
576 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
579 disk
->offset
= cpu_to_le64(val
);
582 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
584 return le32_to_cpu(disk
->flags
);
587 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
590 disk
->flags
= cpu_to_le32(val
);
593 static inline u32
btrfs_key_overflow(struct btrfs_key
*key
)
595 u32 over
= key
->flags
& BTRFS_KEY_OVERFLOW_MASK
;
596 return over
>> BTRFS_KEY_OVERFLOW_SHIFT
;
599 static inline void btrfs_set_key_overflow(struct btrfs_key
*key
, u32 over
)
601 BUG_ON(over
>= BTRFS_KEY_OVERFLOW_MAX
);
602 over
= over
<< BTRFS_KEY_OVERFLOW_SHIFT
;
603 key
->flags
= (key
->flags
& ~((u64
)BTRFS_KEY_OVERFLOW_MASK
)) | over
;
606 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
608 return key
->flags
& BTRFS_KEY_TYPE_MASK
;
611 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
613 return le32_to_cpu(key
->flags
) & BTRFS_KEY_TYPE_MASK
;
616 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 type
)
618 BUG_ON(type
>= BTRFS_KEY_TYPE_MAX
);
619 key
->flags
= (key
->flags
& ~((u64
)BTRFS_KEY_TYPE_MASK
)) | type
;
622 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
, u32 type
)
624 u32 flags
= btrfs_disk_key_flags(key
);
625 BUG_ON(type
>= BTRFS_KEY_TYPE_MAX
);
626 flags
= (flags
& ~((u64
)BTRFS_KEY_TYPE_MASK
)) | type
;
627 btrfs_set_disk_key_flags(key
, flags
);
630 static inline u32
btrfs_disk_key_overflow(struct btrfs_disk_key
*key
)
632 u32 over
= le32_to_cpu(key
->flags
) & BTRFS_KEY_OVERFLOW_MASK
;
633 return over
>> BTRFS_KEY_OVERFLOW_SHIFT
;
636 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key
*key
,
639 u32 flags
= btrfs_disk_key_flags(key
);
640 BUG_ON(over
>= BTRFS_KEY_OVERFLOW_MAX
);
641 over
= over
<< BTRFS_KEY_OVERFLOW_SHIFT
;
642 flags
= (flags
& ~((u64
)BTRFS_KEY_OVERFLOW_MASK
)) | over
;
643 btrfs_set_disk_key_flags(key
, flags
);
646 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
648 return le64_to_cpu(h
->blocknr
);
651 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
653 h
->blocknr
= cpu_to_le64(blocknr
);
656 static inline u64
btrfs_header_generation(struct btrfs_header
*h
)
658 return le64_to_cpu(h
->generation
);
661 static inline void btrfs_set_header_generation(struct btrfs_header
*h
,
664 h
->generation
= cpu_to_le64(val
);
667 static inline u64
btrfs_header_parentid(struct btrfs_header
*h
)
669 return le64_to_cpu(h
->parentid
);
672 static inline void btrfs_set_header_parentid(struct btrfs_header
*h
,
675 h
->parentid
= cpu_to_le64(parentid
);
678 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
680 return le16_to_cpu(h
->nritems
);
683 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
685 h
->nritems
= cpu_to_le16(val
);
688 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
690 return le16_to_cpu(h
->flags
);
693 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
695 h
->flags
= cpu_to_le16(val
);
698 static inline int btrfs_header_level(struct btrfs_header
*h
)
703 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
705 BUG_ON(level
> BTRFS_MAX_LEVEL
);
709 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
711 return (btrfs_header_level(&n
->header
) == 0);
714 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
716 return le64_to_cpu(item
->blocknr
);
719 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
721 item
->blocknr
= cpu_to_le64(val
);
724 static inline u64
btrfs_root_dirid(struct btrfs_root_item
*item
)
726 return le64_to_cpu(item
->root_dirid
);
729 static inline void btrfs_set_root_dirid(struct btrfs_root_item
*item
, u64 val
)
731 item
->root_dirid
= cpu_to_le64(val
);
734 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
736 return le32_to_cpu(item
->refs
);
739 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
741 item
->refs
= cpu_to_le32(val
);
744 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
746 return le64_to_cpu(s
->blocknr
);
749 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
751 s
->blocknr
= cpu_to_le64(val
);
754 static inline u64
btrfs_super_generation(struct btrfs_super_block
*s
)
756 return le64_to_cpu(s
->generation
);
759 static inline void btrfs_set_super_generation(struct btrfs_super_block
*s
,
762 s
->generation
= cpu_to_le64(val
);
765 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
767 return le64_to_cpu(s
->root
);
770 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
772 s
->root
= cpu_to_le64(val
);
775 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
777 return le64_to_cpu(s
->total_blocks
);
780 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
783 s
->total_blocks
= cpu_to_le64(val
);
786 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
788 return le64_to_cpu(s
->blocks_used
);
791 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
794 s
->blocks_used
= cpu_to_le64(val
);
797 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
799 return le32_to_cpu(s
->blocksize
);
802 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
805 s
->blocksize
= cpu_to_le32(val
);
808 static inline u64
btrfs_super_root_dir(struct btrfs_super_block
*s
)
810 return le64_to_cpu(s
->root_dir_objectid
);
813 static inline void btrfs_set_super_root_dir(struct btrfs_super_block
*s
, u64
816 s
->root_dir_objectid
= cpu_to_le64(val
);
819 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
821 return (u8
*)l
->items
;
824 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
827 return le64_to_cpu(e
->disk_blocknr
);
830 static inline void btrfs_set_file_extent_disk_blocknr(struct
831 btrfs_file_extent_item
834 e
->disk_blocknr
= cpu_to_le64(val
);
837 static inline u64
btrfs_file_extent_generation(struct btrfs_file_extent_item
*e
)
839 return le64_to_cpu(e
->generation
);
842 static inline void btrfs_set_file_extent_generation(struct
843 btrfs_file_extent_item
*e
,
846 e
->generation
= cpu_to_le64(val
);
849 static inline u64
btrfs_file_extent_disk_num_blocks(struct
850 btrfs_file_extent_item
*e
)
852 return le64_to_cpu(e
->disk_num_blocks
);
855 static inline void btrfs_set_file_extent_disk_num_blocks(struct
856 btrfs_file_extent_item
859 e
->disk_num_blocks
= cpu_to_le64(val
);
862 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
864 return le64_to_cpu(e
->offset
);
867 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
870 e
->offset
= cpu_to_le64(val
);
873 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
876 return le64_to_cpu(e
->num_blocks
);
879 static inline void btrfs_set_file_extent_num_blocks(struct
880 btrfs_file_extent_item
*e
,
883 e
->num_blocks
= cpu_to_le64(val
);
886 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
888 return sb
->s_fs_info
;
891 static inline void btrfs_check_bounds(void *vptr
, size_t len
,
892 void *vcontainer
, size_t container_len
)
895 char *container
= vcontainer
;
896 WARN_ON(ptr
< container
);
897 WARN_ON(ptr
+ len
> container
+ container_len
);
900 static inline void btrfs_memcpy(struct btrfs_root
*root
,
902 void *dst
, const void *src
, size_t nr
)
904 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
905 memcpy(dst
, src
, nr
);
908 static inline void btrfs_memmove(struct btrfs_root
*root
,
910 void *dst
, void *src
, size_t nr
)
912 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
913 memmove(dst
, src
, nr
);
916 static inline void btrfs_mark_buffer_dirty(struct buffer_head
*bh
)
918 WARN_ON(!atomic_read(&bh
->b_count
));
919 mark_buffer_dirty(bh
);
922 /* helper function to cast into the data area of the leaf. */
923 #define btrfs_item_ptr(leaf, slot, type) \
924 ((type *)(btrfs_leaf_data(leaf) + \
925 btrfs_item_offset((leaf)->items + (slot))))
928 struct buffer_head
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
929 struct btrfs_root
*root
);
930 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
931 *root
, u64 num_blocks
, u64 search_start
, u64
932 search_end
, u64 owner
, struct btrfs_key
*ins
);
933 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
934 struct buffer_head
*buf
);
935 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
936 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
937 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
, struct
940 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
941 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
943 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
944 struct btrfs_path
*btrfs_alloc_path(void);
945 void btrfs_free_path(struct btrfs_path
*p
);
946 void btrfs_init_path(struct btrfs_path
*p
);
947 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
948 struct btrfs_path
*path
);
949 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
950 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
951 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
952 *root
, struct btrfs_path
*path
, struct btrfs_key
953 *cpu_key
, u32 data_size
);
954 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
955 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
956 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
957 *root
, struct buffer_head
*snap
);
959 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
960 struct btrfs_key
*key
);
961 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
962 *root
, struct btrfs_key
*key
, struct btrfs_root_item
964 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
965 *root
, struct btrfs_key
*key
, struct btrfs_root_item
967 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
968 btrfs_root_item
*item
, struct btrfs_key
*key
);
970 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
971 *root
, const char *name
, int name_len
, u64 dir
,
972 struct btrfs_key
*location
, u8 type
);
973 int btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
974 *root
, struct btrfs_path
*path
, u64 dir
,
975 const char *name
, int name_len
, int mod
);
976 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
977 struct btrfs_root
*root
,
978 struct btrfs_path
*path
, u64 dir
,
979 u64 objectid
, int mod
);
980 int btrfs_match_dir_item_name(struct btrfs_root
*root
, struct btrfs_path
*path
,
981 const char *name
, int name_len
);
983 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
984 struct btrfs_root
*fs_root
,
985 u64 dirid
, u64
*objectid
);
986 int btrfs_insert_inode_map(struct btrfs_trans_handle
*trans
,
987 struct btrfs_root
*root
,
988 u64 objectid
, struct btrfs_key
*location
);
989 int btrfs_lookup_inode_map(struct btrfs_trans_handle
*trans
,
990 struct btrfs_root
*root
, struct btrfs_path
*path
,
991 u64 objectid
, int mod
);
992 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
995 int btrfs_insert_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
996 *root
, u64 objectid
, struct btrfs_inode_item
998 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
999 *root
, struct btrfs_path
*path
,
1000 struct btrfs_key
*location
, int mod
);
1003 int btrfs_alloc_file_extent(struct btrfs_trans_handle
*trans
,
1004 struct btrfs_root
*root
,
1005 u64 objectid
, u64 offset
,
1006 u64 num_blocks
, u64 hint_block
,
1008 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1009 struct btrfs_root
*root
,
1010 struct btrfs_path
*path
, u64 objectid
,
1011 u64 blocknr
, int mod
);
1012 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1013 struct btrfs_root
*root
,
1014 u64 objectid
, u64 offset
,
1015 char *data
, size_t len
);
1016 int btrfs_csum_verify_file_block(struct btrfs_root
*root
,
1017 u64 objectid
, u64 offset
,
1018 char *data
, size_t len
);
1020 extern struct subsystem btrfs_subsys
;