5 #include "kerncompat.h"
7 struct btrfs_trans_handle
;
9 #define BTRFS_MAGIC "_BtRfS_M"
11 #define BTRFS_ROOT_TREE_OBJECTID 1
12 #define BTRFS_EXTENT_TREE_OBJECTID 2
13 #define BTRFS_INODE_MAP_OBJECTID 3
14 #define BTRFS_FS_TREE_OBJECTID 4
17 * the key defines the order in the tree, and so it also defines (optimal)
18 * block layout. objectid corresonds to the inode number. The flags
19 * tells us things about the object, and is a kind of stream selector.
20 * so for a given inode, keys with flags of 1 might refer to the inode
21 * data, flags of 2 may point to file data in the btree and flags == 3
22 * may point to extents.
24 * offset is the starting byte offset for this key in the stream.
26 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
27 * in cpu native order. Otherwise they are identical and their sizes
28 * should be the same (ie both packed)
30 struct btrfs_disk_key
{
34 } __attribute__ ((__packed__
));
40 } __attribute__ ((__packed__
));
43 * every tree block (leaf or node) starts with this header.
46 u8 fsid
[16]; /* FS specific uuid */
47 __le64 blocknr
; /* which block this node is supposed to live in */
48 __le64 parentid
; /* objectid of the tree root */
53 /* generation flags to be added */
54 } __attribute__ ((__packed__
));
56 #define BTRFS_MAX_LEVEL 8
57 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
58 sizeof(struct btrfs_header)) / \
59 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
60 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
61 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
65 * the super block basically lists the main trees of the FS
66 * it currently lacks any block count etc etc
68 struct btrfs_super_block
{
69 u8 fsid
[16]; /* FS specific uuid */
70 __le64 blocknr
; /* this block number */
78 } __attribute__ ((__packed__
));
81 * A leaf is full of items. offset and size tell us where to find
82 * the item in the leaf (relative to the start of the data area)
85 struct btrfs_disk_key key
;
88 } __attribute__ ((__packed__
));
91 * leaves have an item area and a data area:
92 * [item0, item1....itemN] [free space] [dataN...data1, data0]
94 * The data is separate from the items to get the keys closer together
98 struct btrfs_header header
;
99 struct btrfs_item items
[];
100 } __attribute__ ((__packed__
));
103 * all non-leaf blocks are nodes, they hold only keys and pointers to
106 struct btrfs_key_ptr
{
107 struct btrfs_disk_key key
;
109 } __attribute__ ((__packed__
));
112 struct btrfs_header header
;
113 struct btrfs_key_ptr ptrs
[];
114 } __attribute__ ((__packed__
));
117 * btrfs_paths remember the path taken from the root down to the leaf.
118 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
119 * to any other levels that are present.
121 * The slots array records the index of the item or block pointer
122 * used while walking the tree.
125 struct btrfs_buffer
*nodes
[BTRFS_MAX_LEVEL
];
126 int slots
[BTRFS_MAX_LEVEL
];
130 * items in the extent btree are used to record the objectid of the
131 * owner of the block and the number of references
133 struct btrfs_extent_item
{
136 } __attribute__ ((__packed__
));
138 struct btrfs_inode_timespec
{
141 } __attribute__ ((__packed__
));
144 * there is no padding here on purpose. If you want to extent the inode,
145 * make a new item type
147 struct btrfs_inode_item
{
158 struct btrfs_inode_timespec atime
;
159 struct btrfs_inode_timespec ctime
;
160 struct btrfs_inode_timespec mtime
;
161 struct btrfs_inode_timespec otime
;
162 } __attribute__ ((__packed__
));
164 /* inline data is just a blob of bytes */
165 struct btrfs_inline_data_item
{
167 } __attribute__ ((__packed__
));
169 struct btrfs_dir_item
{
174 } __attribute__ ((__packed__
));
176 struct btrfs_root_item
{
182 } __attribute__ ((__packed__
));
184 struct btrfs_file_extent_item
{
186 * disk space consumed by the extent, checksum blocks are included
190 __le64 disk_num_blocks
;
192 * the logical offset in file bytes (no csums)
193 * this extent record is for. This allows a file extent to point
194 * into the middle of an existing extent on disk, sharing it
195 * between two snapshots (useful if some bytes in the middle of the
196 * extent have changed
200 * the logical number of file blocks (no csums included)
203 } __attribute__ ((__packed__
));
205 struct btrfs_inode_map_item
{
206 struct btrfs_disk_key key
;
207 } __attribute__ ((__packed__
));
209 struct btrfs_fs_info
{
210 struct btrfs_root
*fs_root
;
211 struct btrfs_root
*extent_root
;
212 struct btrfs_root
*tree_root
;
213 struct btrfs_root
*inode_root
;
214 struct btrfs_key current_insert
;
215 struct btrfs_key last_insert
;
216 struct radix_tree_root cache_radix
;
217 struct radix_tree_root pinned_radix
;
218 struct list_head trans
;
219 struct list_head cache
;
220 u64 last_inode_alloc
;
221 u64 last_inode_alloc_dirid
;
224 struct btrfs_trans_handle
*running_transaction
;
228 * in ram representation of the tree. extent_root is used for all allocations
229 * and for the extent tree extent_root root. current_insert is used
230 * only for the extent tree.
233 struct btrfs_buffer
*node
;
234 struct btrfs_buffer
*commit_root
;
235 struct btrfs_root_item root_item
;
236 struct btrfs_key root_key
;
237 struct btrfs_fs_info
*fs_info
;
243 /* the lower bits in the key flags defines the item type */
244 #define BTRFS_KEY_TYPE_MAX 256
245 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
248 * inode items have the data typically returned from stat and store other
249 * info about object characteristics. There is one for every file and dir in
252 #define BTRFS_INODE_ITEM_KEY 1
255 * dir items are the name -> inode pointers in a directory. There is one
256 * for every name in a directory.
258 #define BTRFS_DIR_ITEM_KEY 2
260 * inline data is file data that fits in the btree.
262 #define BTRFS_INLINE_DATA_KEY 3
264 * extent data is for data that can't fit in the btree. It points to
265 * a (hopefully) huge chunk of disk
267 #define BTRFS_EXTENT_DATA_KEY 4
269 * root items point to tree roots. There are typically in the root
270 * tree used by the super block to find all the other trees
272 #define BTRFS_ROOT_ITEM_KEY 5
274 * extent items are in the extent map tree. These record which blocks
275 * are used, and how many references there are to each block
277 #define BTRFS_EXTENT_ITEM_KEY 6
280 * the inode map records which inode numbers are in use and where
281 * they actually live on disk
283 #define BTRFS_INODE_MAP_ITEM_KEY 7
285 * string items are for debugging. They just store a short string of
288 #define BTRFS_STRING_ITEM_KEY 8
290 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
292 return le64_to_cpu(i
->generation
);
295 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
298 i
->generation
= cpu_to_le64(val
);
301 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
303 return le64_to_cpu(i
->size
);
306 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
308 i
->size
= cpu_to_le64(val
);
311 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
313 return le64_to_cpu(i
->nblocks
);
316 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
318 i
->nblocks
= cpu_to_le64(val
);
321 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
323 return le32_to_cpu(i
->nlink
);
326 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
328 i
->nlink
= cpu_to_le32(val
);
331 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
333 return le32_to_cpu(i
->uid
);
336 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
338 i
->uid
= cpu_to_le32(val
);
341 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
343 return le32_to_cpu(i
->gid
);
346 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
348 i
->gid
= cpu_to_le32(val
);
351 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
353 return le32_to_cpu(i
->mode
);
356 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
358 i
->mode
= cpu_to_le32(val
);
361 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
363 return le32_to_cpu(i
->rdev
);
366 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
368 i
->rdev
= cpu_to_le32(val
);
371 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
373 return le16_to_cpu(i
->flags
);
376 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
378 i
->flags
= cpu_to_le16(val
);
381 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
383 return le16_to_cpu(i
->compat_flags
);
386 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
389 i
->compat_flags
= cpu_to_le16(val
);
393 static inline u64
btrfs_extent_owner(struct btrfs_extent_item
*ei
)
395 return le64_to_cpu(ei
->owner
);
398 static inline void btrfs_set_extent_owner(struct btrfs_extent_item
*ei
, u64 val
)
400 ei
->owner
= cpu_to_le64(val
);
403 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
405 return le32_to_cpu(ei
->refs
);
408 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
410 ei
->refs
= cpu_to_le32(val
);
413 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
415 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
418 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
421 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
424 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
426 return le32_to_cpu(item
->offset
);
429 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
431 item
->offset
= cpu_to_le32(val
);
434 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
436 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
439 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
441 return le16_to_cpu(item
->size
);
444 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
446 item
->size
= cpu_to_le16(val
);
449 static inline u64
btrfs_dir_objectid(struct btrfs_dir_item
*d
)
451 return le64_to_cpu(d
->objectid
);
454 static inline void btrfs_set_dir_objectid(struct btrfs_dir_item
*d
, u64 val
)
456 d
->objectid
= cpu_to_le64(val
);
459 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
461 return le16_to_cpu(d
->flags
);
464 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
466 d
->flags
= cpu_to_le16(val
);
469 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
474 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
479 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
481 return le16_to_cpu(d
->name_len
);
484 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
486 d
->name_len
= cpu_to_le16(val
);
489 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
490 struct btrfs_disk_key
*disk
)
492 cpu
->offset
= le64_to_cpu(disk
->offset
);
493 cpu
->flags
= le32_to_cpu(disk
->flags
);
494 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
497 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
498 struct btrfs_key
*cpu
)
500 disk
->offset
= cpu_to_le64(cpu
->offset
);
501 disk
->flags
= cpu_to_le32(cpu
->flags
);
502 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
505 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
507 return le64_to_cpu(disk
->objectid
);
510 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
513 disk
->objectid
= cpu_to_le64(val
);
516 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
518 return le64_to_cpu(disk
->offset
);
521 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
524 disk
->offset
= cpu_to_le64(val
);
527 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
529 return le32_to_cpu(disk
->flags
);
532 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
535 disk
->flags
= cpu_to_le32(val
);
538 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
540 return key
->flags
& BTRFS_KEY_TYPE_MASK
;
543 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
545 return le32_to_cpu(key
->flags
) & BTRFS_KEY_TYPE_MASK
;
548 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 type
)
550 BUG_ON(type
>= BTRFS_KEY_TYPE_MAX
);
551 key
->flags
= (key
->flags
& ~((u64
)BTRFS_KEY_TYPE_MASK
)) | type
;
554 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
, u32 type
)
556 u32 flags
= btrfs_disk_key_flags(key
);
557 BUG_ON(type
>= BTRFS_KEY_TYPE_MAX
);
558 flags
= (flags
& ~((u64
)BTRFS_KEY_TYPE_MASK
)) | type
;
559 btrfs_set_disk_key_flags(key
, flags
);
562 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
564 return le64_to_cpu(h
->blocknr
);
567 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
569 h
->blocknr
= cpu_to_le64(blocknr
);
572 static inline u64
btrfs_header_parentid(struct btrfs_header
*h
)
574 return le64_to_cpu(h
->parentid
);
577 static inline void btrfs_set_header_parentid(struct btrfs_header
*h
,
580 h
->parentid
= cpu_to_le64(parentid
);
583 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
585 return le16_to_cpu(h
->nritems
);
588 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
590 h
->nritems
= cpu_to_le16(val
);
593 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
595 return le16_to_cpu(h
->flags
);
598 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
600 h
->flags
= cpu_to_le16(val
);
603 static inline int btrfs_header_level(struct btrfs_header
*h
)
605 return btrfs_header_flags(h
) & (BTRFS_MAX_LEVEL
- 1);
608 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
611 BUG_ON(level
> BTRFS_MAX_LEVEL
);
612 flags
= btrfs_header_flags(h
) & ~(BTRFS_MAX_LEVEL
- 1);
613 btrfs_set_header_flags(h
, flags
| level
);
616 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
618 return (btrfs_header_level(&n
->header
) == 0);
621 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
623 return le64_to_cpu(item
->blocknr
);
626 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
628 item
->blocknr
= cpu_to_le64(val
);
631 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
633 return le32_to_cpu(item
->refs
);
636 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
638 item
->refs
= cpu_to_le32(val
);
641 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
643 return le64_to_cpu(s
->blocknr
);
646 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
648 s
->blocknr
= cpu_to_le64(val
);
651 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
653 return le64_to_cpu(s
->root
);
656 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
658 s
->root
= cpu_to_le64(val
);
661 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
663 return le64_to_cpu(s
->total_blocks
);
666 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
669 s
->total_blocks
= cpu_to_le64(val
);
672 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
674 return le64_to_cpu(s
->blocks_used
);
677 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
680 s
->blocks_used
= cpu_to_le64(val
);
683 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
685 return le32_to_cpu(s
->blocksize
);
688 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
691 s
->blocksize
= cpu_to_le32(val
);
694 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
696 return (u8
*)l
->items
;
699 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
702 return le64_to_cpu(e
->disk_blocknr
);
705 static inline void btrfs_set_file_extent_disk_blocknr(struct
706 btrfs_file_extent_item
709 e
->disk_blocknr
= cpu_to_le64(val
);
712 static inline u64
btrfs_file_extent_disk_num_blocks(struct
713 btrfs_file_extent_item
*e
)
715 return le64_to_cpu(e
->disk_num_blocks
);
718 static inline void btrfs_set_file_extent_disk_num_blocks(struct
719 btrfs_file_extent_item
722 e
->disk_num_blocks
= cpu_to_le64(val
);
725 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
727 return le64_to_cpu(e
->offset
);
730 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
733 e
->offset
= cpu_to_le64(val
);
736 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
739 return le64_to_cpu(e
->num_blocks
);
742 static inline void btrfs_set_file_extent_num_blocks(struct
743 btrfs_file_extent_item
*e
,
746 e
->num_blocks
= cpu_to_le64(val
);
749 /* helper function to cast into the data area of the leaf. */
750 #define btrfs_item_ptr(leaf, slot, type) \
751 ((type *)(btrfs_leaf_data(leaf) + \
752 btrfs_item_offset((leaf)->items + (slot))))
754 struct btrfs_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
755 struct btrfs_root
*root
);
756 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
757 struct btrfs_buffer
*buf
);
758 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
759 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
760 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
761 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
763 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
764 void btrfs_init_path(struct btrfs_path
*p
);
765 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
766 struct btrfs_path
*path
);
767 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
768 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
769 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
770 *root
, struct btrfs_path
*path
, struct btrfs_key
771 *cpu_key
, u32 data_size
);
772 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
773 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
774 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
775 *root
, struct btrfs_buffer
*snap
);
776 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
, struct
778 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
779 struct btrfs_key
*key
);
780 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
781 *root
, struct btrfs_key
*key
, struct btrfs_root_item
783 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
784 *root
, struct btrfs_key
*key
, struct btrfs_root_item
786 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
787 btrfs_root_item
*item
, struct btrfs_key
*key
);
788 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
789 *root
, char *name
, int name_len
, u64 dir
, u64
791 int btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
792 *root
, struct btrfs_path
*path
, u64 dir
, char *name
,
793 int name_len
, int mod
);
794 int btrfs_match_dir_item_name(struct btrfs_root
*root
, struct btrfs_path
*path
,
795 char *name
, int name_len
);
796 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
797 struct btrfs_root
*fs_root
,
798 u64 dirid
, u64
*objectid
);
799 int btrfs_insert_inode_map(struct btrfs_trans_handle
*trans
,
800 struct btrfs_root
*root
,
801 u64 objectid
, struct btrfs_key
*location
);
802 int btrfs_lookup_inode_map(struct btrfs_trans_handle
*trans
,
803 struct btrfs_root
*root
, struct btrfs_path
*path
,
804 u64 objectid
, int mod
);