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))
79 * the super block basically lists the main trees of the FS
80 * it currently lacks any block count etc etc
82 struct btrfs_super_block
{
83 u8 csum
[BTRFS_CSUM_SIZE
];
84 /* the first 3 fields must match struct btrfs_header */
85 u8 fsid
[16]; /* FS specific uuid */
86 __le64 blocknr
; /* this block number */
93 __le64 root_dir_objectid
;
94 /* fields below here vary with the underlying disk */
95 __le64 device_block_start
;
96 __le64 device_num_blocks
;
98 } __attribute__ ((__packed__
));
101 * A leaf is full of items. offset and size tell us where to find
102 * the item in the leaf (relative to the start of the data area)
105 struct btrfs_disk_key key
;
108 } __attribute__ ((__packed__
));
111 * leaves have an item area and a data area:
112 * [item0, item1....itemN] [free space] [dataN...data1, data0]
114 * The data is separate from the items to get the keys closer together
118 struct btrfs_header header
;
119 struct btrfs_item items
[];
120 } __attribute__ ((__packed__
));
123 * all non-leaf blocks are nodes, they hold only keys and pointers to
126 struct btrfs_key_ptr
{
127 struct btrfs_disk_key key
;
129 } __attribute__ ((__packed__
));
132 struct btrfs_header header
;
133 struct btrfs_key_ptr ptrs
[];
134 } __attribute__ ((__packed__
));
137 * btrfs_paths remember the path taken from the root down to the leaf.
138 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
139 * to any other levels that are present.
141 * The slots array records the index of the item or block pointer
142 * used while walking the tree.
145 struct buffer_head
*nodes
[BTRFS_MAX_LEVEL
];
146 int slots
[BTRFS_MAX_LEVEL
];
150 * items in the extent btree are used to record the objectid of the
151 * owner of the block and the number of references
153 struct btrfs_extent_item
{
155 } __attribute__ ((__packed__
));
157 struct btrfs_inode_timespec
{
160 } __attribute__ ((__packed__
));
163 * there is no padding here on purpose. If you want to extent the inode,
164 * make a new item type
166 struct btrfs_inode_item
{
177 struct btrfs_inode_timespec atime
;
178 struct btrfs_inode_timespec ctime
;
179 struct btrfs_inode_timespec mtime
;
180 struct btrfs_inode_timespec otime
;
181 } __attribute__ ((__packed__
));
183 /* inline data is just a blob of bytes */
184 struct btrfs_inline_data_item
{
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 struct btrfs_file_extent_item
{
208 * disk space consumed by the extent, checksum blocks are included
212 __le64 disk_num_blocks
;
214 * the logical offset in file blocks (no csums)
215 * this extent record is for. This allows a file extent to point
216 * into the middle of an existing extent on disk, sharing it
217 * between two snapshots (useful if some bytes in the middle of the
218 * extent have changed
222 * the logical number of file blocks (no csums included)
225 } __attribute__ ((__packed__
));
227 struct btrfs_csum_item
{
228 u8 csum
[BTRFS_CSUM_SIZE
];
229 } __attribute__ ((__packed__
));
231 struct btrfs_device_item
{
233 } __attribute__ ((__packed__
));
236 struct btrfs_fs_info
{
237 struct btrfs_root
*extent_root
;
238 struct btrfs_root
*tree_root
;
239 struct btrfs_root
*dev_root
;
240 struct btrfs_key current_insert
;
241 struct btrfs_key last_insert
;
242 struct radix_tree_root fs_roots_radix
;
243 struct radix_tree_root pending_del_radix
;
244 struct radix_tree_root pinned_radix
;
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
;
276 u64 last_inode_alloc
;
279 /* the lower bits in the key flags defines the item type */
280 #define BTRFS_KEY_TYPE_MAX 256
281 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
283 #define BTRFS_KEY_OVERFLOW_MAX 128
284 #define BTRFS_KEY_OVERFLOW_SHIFT 8
285 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
288 * inode items have the data typically returned from stat and store other
289 * info about object characteristics. There is one for every file and dir in
292 #define BTRFS_INODE_ITEM_KEY 1
295 * dir items are the name -> inode pointers in a directory. There is one
296 * for every name in a directory.
298 #define BTRFS_DIR_ITEM_KEY 2
299 #define BTRFS_DIR_INDEX_KEY 3
301 * inline data is file data that fits in the btree.
303 #define BTRFS_INLINE_DATA_KEY 4
305 * extent data is for data that can't fit in the btree. It points to
306 * a (hopefully) huge chunk of disk
308 #define BTRFS_EXTENT_DATA_KEY 5
310 * csum items have the checksums for data in the extents
312 #define BTRFS_CSUM_ITEM_KEY 6
315 * root items point to tree roots. There are typically in the root
316 * tree used by the super block to find all the other trees
318 #define BTRFS_ROOT_ITEM_KEY 7
320 * extent items are in the extent map tree. These record which blocks
321 * are used, and how many references there are to each block
323 #define BTRFS_EXTENT_ITEM_KEY 8
326 * dev items list the devices that make up the FS
328 #define BTRFS_DEV_ITEM_KEY 9
331 * string items are for debugging. They just store a short string of
334 #define BTRFS_STRING_ITEM_KEY 10
336 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
338 return le64_to_cpu(i
->generation
);
341 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
344 i
->generation
= cpu_to_le64(val
);
347 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
349 return le64_to_cpu(i
->size
);
352 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
354 i
->size
= cpu_to_le64(val
);
357 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
359 return le64_to_cpu(i
->nblocks
);
362 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
364 i
->nblocks
= cpu_to_le64(val
);
367 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
369 return le32_to_cpu(i
->nlink
);
372 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
374 i
->nlink
= cpu_to_le32(val
);
377 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
379 return le32_to_cpu(i
->uid
);
382 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
384 i
->uid
= cpu_to_le32(val
);
387 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
389 return le32_to_cpu(i
->gid
);
392 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
394 i
->gid
= cpu_to_le32(val
);
397 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
399 return le32_to_cpu(i
->mode
);
402 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
404 i
->mode
= cpu_to_le32(val
);
407 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
409 return le32_to_cpu(i
->rdev
);
412 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
414 i
->rdev
= cpu_to_le32(val
);
417 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
419 return le16_to_cpu(i
->flags
);
422 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
424 i
->flags
= cpu_to_le16(val
);
427 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
429 return le16_to_cpu(i
->compat_flags
);
432 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
435 i
->compat_flags
= cpu_to_le16(val
);
438 static inline u64
btrfs_timespec_sec(struct btrfs_inode_timespec
*ts
)
440 return le64_to_cpu(ts
->sec
);
443 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec
*ts
,
446 ts
->sec
= cpu_to_le64(val
);
449 static inline u32
btrfs_timespec_nsec(struct btrfs_inode_timespec
*ts
)
451 return le32_to_cpu(ts
->nsec
);
454 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec
*ts
,
457 ts
->nsec
= cpu_to_le32(val
);
460 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
462 return le32_to_cpu(ei
->refs
);
465 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
467 ei
->refs
= cpu_to_le32(val
);
470 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
472 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
475 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
478 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
481 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
483 return le32_to_cpu(item
->offset
);
486 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
488 item
->offset
= cpu_to_le32(val
);
491 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
493 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
496 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
498 return le16_to_cpu(item
->size
);
501 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
503 item
->size
= cpu_to_le16(val
);
506 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
508 return le16_to_cpu(d
->flags
);
511 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
513 d
->flags
= cpu_to_le16(val
);
516 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
521 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
526 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
528 return le16_to_cpu(d
->name_len
);
531 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
533 d
->name_len
= cpu_to_le16(val
);
536 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
537 struct btrfs_disk_key
*disk
)
539 cpu
->offset
= le64_to_cpu(disk
->offset
);
540 cpu
->flags
= le32_to_cpu(disk
->flags
);
541 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
544 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
545 struct btrfs_key
*cpu
)
547 disk
->offset
= cpu_to_le64(cpu
->offset
);
548 disk
->flags
= cpu_to_le32(cpu
->flags
);
549 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
552 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
554 return le64_to_cpu(disk
->objectid
);
557 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
560 disk
->objectid
= cpu_to_le64(val
);
563 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
565 return le64_to_cpu(disk
->offset
);
568 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
571 disk
->offset
= cpu_to_le64(val
);
574 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
576 return le32_to_cpu(disk
->flags
);
579 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
582 disk
->flags
= cpu_to_le32(val
);
585 static inline u32
btrfs_key_overflow(struct btrfs_key
*key
)
587 u32 over
= key
->flags
& BTRFS_KEY_OVERFLOW_MASK
;
588 return over
>> BTRFS_KEY_OVERFLOW_SHIFT
;
591 static inline void btrfs_set_key_overflow(struct btrfs_key
*key
, u32 over
)
593 BUG_ON(over
>= BTRFS_KEY_OVERFLOW_MAX
);
594 over
= over
<< BTRFS_KEY_OVERFLOW_SHIFT
;
595 key
->flags
= (key
->flags
& ~((u64
)BTRFS_KEY_OVERFLOW_MASK
)) | over
;
598 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
600 return key
->flags
& BTRFS_KEY_TYPE_MASK
;
603 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
605 return le32_to_cpu(key
->flags
) & BTRFS_KEY_TYPE_MASK
;
608 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 type
)
610 BUG_ON(type
>= BTRFS_KEY_TYPE_MAX
);
611 key
->flags
= (key
->flags
& ~((u64
)BTRFS_KEY_TYPE_MASK
)) | type
;
614 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
, u32 type
)
616 u32 flags
= btrfs_disk_key_flags(key
);
617 BUG_ON(type
>= BTRFS_KEY_TYPE_MAX
);
618 flags
= (flags
& ~((u64
)BTRFS_KEY_TYPE_MASK
)) | type
;
619 btrfs_set_disk_key_flags(key
, flags
);
622 static inline u32
btrfs_disk_key_overflow(struct btrfs_disk_key
*key
)
624 u32 over
= le32_to_cpu(key
->flags
) & BTRFS_KEY_OVERFLOW_MASK
;
625 return over
>> BTRFS_KEY_OVERFLOW_SHIFT
;
628 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key
*key
,
631 u32 flags
= btrfs_disk_key_flags(key
);
632 BUG_ON(over
>= BTRFS_KEY_OVERFLOW_MAX
);
633 over
= over
<< BTRFS_KEY_OVERFLOW_SHIFT
;
634 flags
= (flags
& ~((u64
)BTRFS_KEY_OVERFLOW_MASK
)) | over
;
635 btrfs_set_disk_key_flags(key
, flags
);
638 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
640 return le64_to_cpu(h
->blocknr
);
643 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
645 h
->blocknr
= cpu_to_le64(blocknr
);
648 static inline u64
btrfs_header_generation(struct btrfs_header
*h
)
650 return le64_to_cpu(h
->generation
);
653 static inline void btrfs_set_header_generation(struct btrfs_header
*h
,
656 h
->generation
= cpu_to_le64(val
);
659 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
661 return le16_to_cpu(h
->nritems
);
664 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
666 h
->nritems
= cpu_to_le16(val
);
669 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
671 return le16_to_cpu(h
->flags
);
674 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
676 h
->flags
= cpu_to_le16(val
);
679 static inline int btrfs_header_level(struct btrfs_header
*h
)
684 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
686 BUG_ON(level
> BTRFS_MAX_LEVEL
);
690 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
692 return (btrfs_header_level(&n
->header
) == 0);
695 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
697 return le64_to_cpu(item
->blocknr
);
700 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
702 item
->blocknr
= cpu_to_le64(val
);
705 static inline u64
btrfs_root_dirid(struct btrfs_root_item
*item
)
707 return le64_to_cpu(item
->root_dirid
);
710 static inline void btrfs_set_root_dirid(struct btrfs_root_item
*item
, u64 val
)
712 item
->root_dirid
= cpu_to_le64(val
);
715 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
717 return le32_to_cpu(item
->refs
);
720 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
722 item
->refs
= cpu_to_le32(val
);
725 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
727 return le64_to_cpu(s
->blocknr
);
730 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
732 s
->blocknr
= cpu_to_le64(val
);
735 static inline u64
btrfs_super_generation(struct btrfs_super_block
*s
)
737 return le64_to_cpu(s
->generation
);
740 static inline void btrfs_set_super_generation(struct btrfs_super_block
*s
,
743 s
->generation
= cpu_to_le64(val
);
746 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
748 return le64_to_cpu(s
->root
);
751 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
753 s
->root
= cpu_to_le64(val
);
756 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
758 return le64_to_cpu(s
->total_blocks
);
761 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
764 s
->total_blocks
= cpu_to_le64(val
);
767 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
769 return le64_to_cpu(s
->blocks_used
);
772 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
775 s
->blocks_used
= cpu_to_le64(val
);
778 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
780 return le32_to_cpu(s
->blocksize
);
783 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
786 s
->blocksize
= cpu_to_le32(val
);
789 static inline u64
btrfs_super_root_dir(struct btrfs_super_block
*s
)
791 return le64_to_cpu(s
->root_dir_objectid
);
794 static inline void btrfs_set_super_root_dir(struct btrfs_super_block
*s
, u64
797 s
->root_dir_objectid
= cpu_to_le64(val
);
800 static inline u64
btrfs_super_device_block_start(struct btrfs_super_block
*s
)
802 return le64_to_cpu(s
->device_block_start
);
805 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
808 s
->device_block_start
= cpu_to_le64(val
);
811 static inline u64
btrfs_super_device_num_blocks(struct btrfs_super_block
*s
)
813 return le64_to_cpu(s
->device_num_blocks
);
816 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
819 s
->device_num_blocks
= cpu_to_le64(val
);
822 static inline u64
btrfs_super_device_root(struct btrfs_super_block
*s
)
824 return le64_to_cpu(s
->device_root
);
827 static inline void btrfs_set_super_device_root(struct btrfs_super_block
830 s
->device_root
= cpu_to_le64(val
);
834 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
836 return (u8
*)l
->items
;
839 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
842 return le64_to_cpu(e
->disk_blocknr
);
845 static inline void btrfs_set_file_extent_disk_blocknr(struct
846 btrfs_file_extent_item
849 e
->disk_blocknr
= cpu_to_le64(val
);
852 static inline u64
btrfs_file_extent_generation(struct btrfs_file_extent_item
*e
)
854 return le64_to_cpu(e
->generation
);
857 static inline void btrfs_set_file_extent_generation(struct
858 btrfs_file_extent_item
*e
,
861 e
->generation
= cpu_to_le64(val
);
864 static inline u64
btrfs_file_extent_disk_num_blocks(struct
865 btrfs_file_extent_item
*e
)
867 return le64_to_cpu(e
->disk_num_blocks
);
870 static inline void btrfs_set_file_extent_disk_num_blocks(struct
871 btrfs_file_extent_item
874 e
->disk_num_blocks
= cpu_to_le64(val
);
877 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
879 return le64_to_cpu(e
->offset
);
882 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
885 e
->offset
= cpu_to_le64(val
);
888 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
891 return le64_to_cpu(e
->num_blocks
);
894 static inline void btrfs_set_file_extent_num_blocks(struct
895 btrfs_file_extent_item
*e
,
898 e
->num_blocks
= cpu_to_le64(val
);
901 static inline u16
btrfs_device_pathlen(struct btrfs_device_item
*d
)
903 return le16_to_cpu(d
->pathlen
);
906 static inline void btrfs_set_device_pathlen(struct btrfs_device_item
*d
,
909 d
->pathlen
= cpu_to_le16(val
);
912 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
914 return sb
->s_fs_info
;
917 static inline void btrfs_check_bounds(void *vptr
, size_t len
,
918 void *vcontainer
, size_t container_len
)
921 char *container
= vcontainer
;
922 WARN_ON(ptr
< container
);
923 WARN_ON(ptr
+ len
> container
+ container_len
);
926 static inline void btrfs_memcpy(struct btrfs_root
*root
,
928 void *dst
, const void *src
, size_t nr
)
930 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
931 memcpy(dst
, src
, nr
);
934 static inline void btrfs_memmove(struct btrfs_root
*root
,
936 void *dst
, void *src
, size_t nr
)
938 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
939 memmove(dst
, src
, nr
);
942 static inline void btrfs_mark_buffer_dirty(struct buffer_head
*bh
)
944 WARN_ON(!atomic_read(&bh
->b_count
));
945 mark_buffer_dirty(bh
);
948 /* helper function to cast into the data area of the leaf. */
949 #define btrfs_item_ptr(leaf, slot, type) \
950 ((type *)(btrfs_leaf_data(leaf) + \
951 btrfs_item_offset((leaf)->items + (slot))))
954 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
955 struct btrfs_root
*root
);
956 struct buffer_head
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
957 struct btrfs_root
*root
);
958 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
959 *root
, u64 num_blocks
, u64 search_start
, u64
960 search_end
, struct btrfs_key
*ins
);
961 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
962 struct buffer_head
*buf
);
963 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
964 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
965 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
, struct
968 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
969 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
971 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
972 struct btrfs_path
*btrfs_alloc_path(void);
973 void btrfs_free_path(struct btrfs_path
*p
);
974 void btrfs_init_path(struct btrfs_path
*p
);
975 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
976 struct btrfs_path
*path
);
977 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
978 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
979 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
980 *root
, struct btrfs_path
*path
, struct btrfs_key
981 *cpu_key
, u32 data_size
);
982 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
983 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
984 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
985 *root
, struct buffer_head
*snap
);
987 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
988 struct btrfs_key
*key
);
989 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
990 *root
, struct btrfs_key
*key
, struct btrfs_root_item
992 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
993 *root
, struct btrfs_key
*key
, struct btrfs_root_item
995 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
996 btrfs_root_item
*item
, struct btrfs_key
*key
);
998 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
999 *root
, const char *name
, int name_len
, u64 dir
,
1000 struct btrfs_key
*location
, u8 type
);
1001 int btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1002 *root
, struct btrfs_path
*path
, u64 dir
,
1003 const char *name
, int name_len
, int mod
);
1004 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1005 struct btrfs_root
*root
,
1006 struct btrfs_path
*path
, u64 dir
,
1007 u64 objectid
, int mod
);
1008 int btrfs_match_dir_item_name(struct btrfs_root
*root
, struct btrfs_path
*path
,
1009 const char *name
, int name_len
);
1011 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1012 struct btrfs_root
*fs_root
,
1013 u64 dirid
, u64
*objectid
);
1014 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1017 int btrfs_insert_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1018 *root
, u64 objectid
, struct btrfs_inode_item
1020 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1021 *root
, struct btrfs_path
*path
,
1022 struct btrfs_key
*location
, int mod
);
1025 int btrfs_alloc_file_extent(struct btrfs_trans_handle
*trans
,
1026 struct btrfs_root
*root
,
1027 u64 objectid
, u64 offset
,
1028 u64 num_blocks
, u64 hint_block
,
1030 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1031 struct btrfs_root
*root
,
1032 struct btrfs_path
*path
, u64 objectid
,
1033 u64 blocknr
, int mod
);
1034 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1035 struct btrfs_root
*root
,
1036 u64 objectid
, u64 offset
,
1037 char *data
, size_t len
);
1038 int btrfs_csum_verify_file_block(struct btrfs_root
*root
,
1039 u64 objectid
, u64 offset
,
1040 char *data
, size_t len
);
1042 extern struct subsystem btrfs_subsys
;