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 */
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))
77 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
78 sizeof(struct btrfs_item) - \
79 sizeof(struct btrfs_file_extent_item))
83 * the super block basically lists the main trees of the FS
84 * it currently lacks any block count etc etc
86 struct btrfs_super_block
{
87 u8 csum
[BTRFS_CSUM_SIZE
];
88 /* the first 3 fields must match struct btrfs_header */
89 u8 fsid
[16]; /* FS specific uuid */
90 __le64 blocknr
; /* this block number */
97 __le64 root_dir_objectid
;
98 __le64 last_device_id
;
99 /* fields below here vary with the underlying disk */
100 __le64 device_block_start
;
101 __le64 device_num_blocks
;
104 } __attribute__ ((__packed__
));
107 * A leaf is full of items. offset and size tell us where to find
108 * the item in the leaf (relative to the start of the data area)
111 struct btrfs_disk_key key
;
114 } __attribute__ ((__packed__
));
117 * leaves have an item area and a data area:
118 * [item0, item1....itemN] [free space] [dataN...data1, data0]
120 * The data is separate from the items to get the keys closer together
124 struct btrfs_header header
;
125 struct btrfs_item items
[];
126 } __attribute__ ((__packed__
));
129 * all non-leaf blocks are nodes, they hold only keys and pointers to
132 struct btrfs_key_ptr
{
133 struct btrfs_disk_key key
;
135 } __attribute__ ((__packed__
));
138 struct btrfs_header header
;
139 struct btrfs_key_ptr ptrs
[];
140 } __attribute__ ((__packed__
));
143 * btrfs_paths remember the path taken from the root down to the leaf.
144 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
145 * to any other levels that are present.
147 * The slots array records the index of the item or block pointer
148 * used while walking the tree.
151 struct buffer_head
*nodes
[BTRFS_MAX_LEVEL
];
152 int slots
[BTRFS_MAX_LEVEL
];
156 * items in the extent btree are used to record the objectid of the
157 * owner of the block and the number of references
159 struct btrfs_extent_item
{
162 } __attribute__ ((__packed__
));
164 struct btrfs_inode_timespec
{
167 } __attribute__ ((__packed__
));
170 * there is no padding here on purpose. If you want to extent the inode,
171 * make a new item type
173 struct btrfs_inode_item
{
184 struct btrfs_inode_timespec atime
;
185 struct btrfs_inode_timespec ctime
;
186 struct btrfs_inode_timespec mtime
;
187 struct btrfs_inode_timespec otime
;
188 } __attribute__ ((__packed__
));
190 struct btrfs_dir_item
{
191 struct btrfs_disk_key location
;
195 } __attribute__ ((__packed__
));
197 struct btrfs_root_item
{
198 struct btrfs_inode_item inode
;
205 } __attribute__ ((__packed__
));
207 #define BTRFS_FILE_EXTENT_REG 0
208 #define BTRFS_FILE_EXTENT_INLINE 1
210 struct btrfs_file_extent_item
{
214 * disk space consumed by the extent, checksum blocks are included
218 __le64 disk_num_blocks
;
220 * the logical offset in file blocks (no csums)
221 * this extent record is for. This allows a file extent to point
222 * into the middle of an existing extent on disk, sharing it
223 * between two snapshots (useful if some bytes in the middle of the
224 * extent have changed
228 * the logical number of file blocks (no csums included)
231 } __attribute__ ((__packed__
));
233 struct btrfs_csum_item
{
234 u8 csum
[BTRFS_CSUM_SIZE
];
235 } __attribute__ ((__packed__
));
237 struct btrfs_device_item
{
240 } __attribute__ ((__packed__
));
243 struct btrfs_fs_info
{
244 struct btrfs_root
*extent_root
;
245 struct btrfs_root
*tree_root
;
246 struct btrfs_root
*dev_root
;
247 struct btrfs_key last_insert
;
248 struct radix_tree_root fs_roots_radix
;
249 struct radix_tree_root pending_del_radix
;
250 struct radix_tree_root pinned_radix
;
251 struct radix_tree_root dev_radix
;
253 u64 extent_tree_insert
[BTRFS_MAX_LEVEL
* 3];
254 int extent_tree_insert_nr
;
255 u64 extent_tree_prealloc
[BTRFS_MAX_LEVEL
* 3];
256 int extent_tree_prealloc_nr
;
259 struct btrfs_transaction
*running_transaction
;
260 struct btrfs_super_block
*disk_super
;
261 struct buffer_head
*sb_buffer
;
262 struct super_block
*sb
;
263 struct inode
*btree_inode
;
264 struct mutex trans_mutex
;
265 struct mutex fs_mutex
;
266 struct list_head trans_list
;
267 struct crypto_hash
*hash_tfm
;
268 spinlock_t hash_lock
;
274 * in ram representation of the tree. extent_root is used for all allocations
275 * and for the extent tree extent_root root.
278 struct buffer_head
*node
;
279 struct buffer_head
*commit_root
;
280 struct btrfs_root_item root_item
;
281 struct btrfs_key root_key
;
282 struct btrfs_fs_info
*fs_info
;
290 u64 last_inode_alloc
;
293 /* the lower bits in the key flags defines the item type */
294 #define BTRFS_KEY_TYPE_MAX 256
295 #define BTRFS_KEY_TYPE_SHIFT 24
296 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
297 BTRFS_KEY_TYPE_SHIFT)
300 * inode items have the data typically returned from stat and store other
301 * info about object characteristics. There is one for every file and dir in
304 #define BTRFS_INODE_ITEM_KEY 1
307 * dir items are the name -> inode pointers in a directory. There is one
308 * for every name in a directory.
310 #define BTRFS_DIR_ITEM_KEY 2
311 #define BTRFS_DIR_INDEX_KEY 3
313 * inline data is file data that fits in the btree.
315 #define BTRFS_INLINE_DATA_KEY 4
317 * extent data is for data that can't fit in the btree. It points to
318 * a (hopefully) huge chunk of disk
320 #define BTRFS_EXTENT_DATA_KEY 5
322 * csum items have the checksums for data in the extents
324 #define BTRFS_CSUM_ITEM_KEY 6
327 * root items point to tree roots. There are typically in the root
328 * tree used by the super block to find all the other trees
330 #define BTRFS_ROOT_ITEM_KEY 7
332 * extent items are in the extent map tree. These record which blocks
333 * are used, and how many references there are to each block
335 #define BTRFS_EXTENT_ITEM_KEY 8
338 * dev items list the devices that make up the FS
340 #define BTRFS_DEV_ITEM_KEY 9
343 * string items are for debugging. They just store a short string of
346 #define BTRFS_STRING_ITEM_KEY 10
348 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
350 return le64_to_cpu(i
->generation
);
353 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
356 i
->generation
= cpu_to_le64(val
);
359 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
361 return le64_to_cpu(i
->size
);
364 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
366 i
->size
= cpu_to_le64(val
);
369 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
371 return le64_to_cpu(i
->nblocks
);
374 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
376 i
->nblocks
= cpu_to_le64(val
);
379 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
381 return le32_to_cpu(i
->nlink
);
384 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
386 i
->nlink
= cpu_to_le32(val
);
389 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
391 return le32_to_cpu(i
->uid
);
394 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
396 i
->uid
= cpu_to_le32(val
);
399 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
401 return le32_to_cpu(i
->gid
);
404 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
406 i
->gid
= cpu_to_le32(val
);
409 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
411 return le32_to_cpu(i
->mode
);
414 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
416 i
->mode
= cpu_to_le32(val
);
419 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
421 return le32_to_cpu(i
->rdev
);
424 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
426 i
->rdev
= cpu_to_le32(val
);
429 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
431 return le16_to_cpu(i
->flags
);
434 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
436 i
->flags
= cpu_to_le16(val
);
439 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
441 return le16_to_cpu(i
->compat_flags
);
444 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
447 i
->compat_flags
= cpu_to_le16(val
);
450 static inline u64
btrfs_timespec_sec(struct btrfs_inode_timespec
*ts
)
452 return le64_to_cpu(ts
->sec
);
455 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec
*ts
,
458 ts
->sec
= cpu_to_le64(val
);
461 static inline u32
btrfs_timespec_nsec(struct btrfs_inode_timespec
*ts
)
463 return le32_to_cpu(ts
->nsec
);
466 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec
*ts
,
469 ts
->nsec
= cpu_to_le32(val
);
472 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
474 return le32_to_cpu(ei
->refs
);
477 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
479 ei
->refs
= cpu_to_le32(val
);
482 static inline u64
btrfs_extent_owner(struct btrfs_extent_item
*ei
)
484 return le64_to_cpu(ei
->owner
);
487 static inline void btrfs_set_extent_owner(struct btrfs_extent_item
*ei
, u64 val
)
489 ei
->owner
= cpu_to_le64(val
);
492 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
494 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
498 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
501 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
504 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
506 return le32_to_cpu(item
->offset
);
509 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
511 item
->offset
= cpu_to_le32(val
);
514 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
516 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
519 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
521 return le16_to_cpu(item
->size
);
524 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
526 item
->size
= cpu_to_le16(val
);
529 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
531 return le16_to_cpu(d
->flags
);
534 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
536 d
->flags
= cpu_to_le16(val
);
539 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
544 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
549 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
551 return le16_to_cpu(d
->name_len
);
554 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
556 d
->name_len
= cpu_to_le16(val
);
559 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
560 struct btrfs_disk_key
*disk
)
562 cpu
->offset
= le64_to_cpu(disk
->offset
);
563 cpu
->flags
= le32_to_cpu(disk
->flags
);
564 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
567 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
568 struct btrfs_key
*cpu
)
570 disk
->offset
= cpu_to_le64(cpu
->offset
);
571 disk
->flags
= cpu_to_le32(cpu
->flags
);
572 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
575 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
577 return le64_to_cpu(disk
->objectid
);
580 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
583 disk
->objectid
= cpu_to_le64(val
);
586 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
588 return le64_to_cpu(disk
->offset
);
591 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
594 disk
->offset
= cpu_to_le64(val
);
597 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
599 return le32_to_cpu(disk
->flags
);
602 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
605 disk
->flags
= cpu_to_le32(val
);
608 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
610 return le32_to_cpu(key
->flags
) >> BTRFS_KEY_TYPE_SHIFT
;
613 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
,
616 u32 flags
= btrfs_disk_key_flags(key
);
617 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
618 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
619 flags
= (flags
& ~BTRFS_KEY_TYPE_MASK
) | val
;
620 btrfs_set_disk_key_flags(key
, flags
);
623 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
625 return key
->flags
>> BTRFS_KEY_TYPE_SHIFT
;
628 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 val
)
630 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
631 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
632 key
->flags
= (key
->flags
& ~(BTRFS_KEY_TYPE_MASK
)) | val
;
635 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
637 return le64_to_cpu(h
->blocknr
);
640 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
642 h
->blocknr
= cpu_to_le64(blocknr
);
645 static inline u64
btrfs_header_generation(struct btrfs_header
*h
)
647 return le64_to_cpu(h
->generation
);
650 static inline void btrfs_set_header_generation(struct btrfs_header
*h
,
653 h
->generation
= cpu_to_le64(val
);
656 static inline u64
btrfs_header_owner(struct btrfs_header
*h
)
658 return le64_to_cpu(h
->owner
);
661 static inline void btrfs_set_header_owner(struct btrfs_header
*h
,
664 h
->owner
= cpu_to_le64(val
);
667 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
669 return le16_to_cpu(h
->nritems
);
672 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
674 h
->nritems
= cpu_to_le16(val
);
677 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
679 return le16_to_cpu(h
->flags
);
682 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
684 h
->flags
= cpu_to_le16(val
);
687 static inline int btrfs_header_level(struct btrfs_header
*h
)
692 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
694 BUG_ON(level
> BTRFS_MAX_LEVEL
);
698 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
700 return (btrfs_header_level(&n
->header
) == 0);
703 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
705 return le64_to_cpu(item
->blocknr
);
708 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
710 item
->blocknr
= cpu_to_le64(val
);
713 static inline u64
btrfs_root_dirid(struct btrfs_root_item
*item
)
715 return le64_to_cpu(item
->root_dirid
);
718 static inline void btrfs_set_root_dirid(struct btrfs_root_item
*item
, u64 val
)
720 item
->root_dirid
= cpu_to_le64(val
);
723 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
725 return le32_to_cpu(item
->refs
);
728 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
730 item
->refs
= cpu_to_le32(val
);
733 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
735 return le64_to_cpu(s
->blocknr
);
738 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
740 s
->blocknr
= cpu_to_le64(val
);
743 static inline u64
btrfs_super_generation(struct btrfs_super_block
*s
)
745 return le64_to_cpu(s
->generation
);
748 static inline void btrfs_set_super_generation(struct btrfs_super_block
*s
,
751 s
->generation
= cpu_to_le64(val
);
754 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
756 return le64_to_cpu(s
->root
);
759 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
761 s
->root
= cpu_to_le64(val
);
764 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
766 return le64_to_cpu(s
->total_blocks
);
769 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
772 s
->total_blocks
= cpu_to_le64(val
);
775 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
777 return le64_to_cpu(s
->blocks_used
);
780 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
783 s
->blocks_used
= cpu_to_le64(val
);
786 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
788 return le32_to_cpu(s
->blocksize
);
791 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
794 s
->blocksize
= cpu_to_le32(val
);
797 static inline u64
btrfs_super_root_dir(struct btrfs_super_block
*s
)
799 return le64_to_cpu(s
->root_dir_objectid
);
802 static inline void btrfs_set_super_root_dir(struct btrfs_super_block
*s
, u64
805 s
->root_dir_objectid
= cpu_to_le64(val
);
808 static inline u64
btrfs_super_last_device_id(struct btrfs_super_block
*s
)
810 return le64_to_cpu(s
->last_device_id
);
813 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block
*s
,
816 s
->last_device_id
= cpu_to_le64(val
);
819 static inline u64
btrfs_super_device_id(struct btrfs_super_block
*s
)
821 return le64_to_cpu(s
->device_id
);
824 static inline void btrfs_set_super_device_id(struct btrfs_super_block
*s
,
827 s
->device_id
= cpu_to_le64(val
);
830 static inline u64
btrfs_super_device_block_start(struct btrfs_super_block
*s
)
832 return le64_to_cpu(s
->device_block_start
);
835 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
838 s
->device_block_start
= cpu_to_le64(val
);
841 static inline u64
btrfs_super_device_num_blocks(struct btrfs_super_block
*s
)
843 return le64_to_cpu(s
->device_num_blocks
);
846 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
849 s
->device_num_blocks
= cpu_to_le64(val
);
852 static inline u64
btrfs_super_device_root(struct btrfs_super_block
*s
)
854 return le64_to_cpu(s
->device_root
);
857 static inline void btrfs_set_super_device_root(struct btrfs_super_block
860 s
->device_root
= cpu_to_le64(val
);
864 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
866 return (u8
*)l
->items
;
869 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item
*e
)
873 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item
*e
,
879 static inline char *btrfs_file_extent_inline_start(struct
880 btrfs_file_extent_item
*e
)
882 return (char *)(&e
->disk_blocknr
);
885 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
887 return (unsigned long)(&((struct
888 btrfs_file_extent_item
*)NULL
)->disk_blocknr
) + datasize
;
891 static inline u32
btrfs_file_extent_inline_len(struct btrfs_item
*e
)
893 struct btrfs_file_extent_item
*fe
= NULL
;
894 return btrfs_item_size(e
) - (unsigned long)(&fe
->disk_blocknr
);
897 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
900 return le64_to_cpu(e
->disk_blocknr
);
903 static inline void btrfs_set_file_extent_disk_blocknr(struct
904 btrfs_file_extent_item
907 e
->disk_blocknr
= cpu_to_le64(val
);
910 static inline u64
btrfs_file_extent_generation(struct btrfs_file_extent_item
*e
)
912 return le64_to_cpu(e
->generation
);
915 static inline void btrfs_set_file_extent_generation(struct
916 btrfs_file_extent_item
*e
,
919 e
->generation
= cpu_to_le64(val
);
922 static inline u64
btrfs_file_extent_disk_num_blocks(struct
923 btrfs_file_extent_item
*e
)
925 return le64_to_cpu(e
->disk_num_blocks
);
928 static inline void btrfs_set_file_extent_disk_num_blocks(struct
929 btrfs_file_extent_item
932 e
->disk_num_blocks
= cpu_to_le64(val
);
935 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
937 return le64_to_cpu(e
->offset
);
940 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
943 e
->offset
= cpu_to_le64(val
);
946 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
949 return le64_to_cpu(e
->num_blocks
);
952 static inline void btrfs_set_file_extent_num_blocks(struct
953 btrfs_file_extent_item
*e
,
956 e
->num_blocks
= cpu_to_le64(val
);
959 static inline u16
btrfs_device_pathlen(struct btrfs_device_item
*d
)
961 return le16_to_cpu(d
->pathlen
);
964 static inline void btrfs_set_device_pathlen(struct btrfs_device_item
*d
,
967 d
->pathlen
= cpu_to_le16(val
);
970 static inline u64
btrfs_device_id(struct btrfs_device_item
*d
)
972 return le64_to_cpu(d
->device_id
);
975 static inline void btrfs_set_device_id(struct btrfs_device_item
*d
,
978 d
->device_id
= cpu_to_le64(val
);
981 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
983 return sb
->s_fs_info
;
986 static inline void btrfs_check_bounds(void *vptr
, size_t len
,
987 void *vcontainer
, size_t container_len
)
990 char *container
= vcontainer
;
991 WARN_ON(ptr
< container
);
992 WARN_ON(ptr
+ len
> container
+ container_len
);
995 static inline void btrfs_memcpy(struct btrfs_root
*root
,
997 void *dst
, const void *src
, size_t nr
)
999 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
1000 memcpy(dst
, src
, nr
);
1003 static inline void btrfs_memmove(struct btrfs_root
*root
,
1005 void *dst
, void *src
, size_t nr
)
1007 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
1008 memmove(dst
, src
, nr
);
1011 static inline void btrfs_mark_buffer_dirty(struct buffer_head
*bh
)
1013 WARN_ON(!atomic_read(&bh
->b_count
));
1014 mark_buffer_dirty(bh
);
1017 /* helper function to cast into the data area of the leaf. */
1018 #define btrfs_item_ptr(leaf, slot, type) \
1019 ((type *)(btrfs_leaf_data(leaf) + \
1020 btrfs_item_offset((leaf)->items + (slot))))
1023 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
1024 struct btrfs_root
*root
);
1025 struct buffer_head
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
1026 struct btrfs_root
*root
);
1027 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
1028 struct btrfs_root
*root
, u64 owner
,
1029 u64 num_blocks
, u64 search_start
,
1030 u64 search_end
, struct btrfs_key
*ins
);
1031 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1032 struct buffer_head
*buf
);
1033 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
1034 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
1035 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
, struct
1037 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1038 struct btrfs_root
*root
,
1039 u64 blocknr
, u64 num_blocks
);
1041 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1042 *root
, struct btrfs_path
*path
, u32 data_size
);
1043 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
1044 struct btrfs_root
*root
,
1045 struct btrfs_path
*path
,
1047 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1048 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
1050 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
1051 struct btrfs_path
*btrfs_alloc_path(void);
1052 void btrfs_free_path(struct btrfs_path
*p
);
1053 void btrfs_init_path(struct btrfs_path
*p
);
1054 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1055 struct btrfs_path
*path
);
1056 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1057 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1058 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1059 *root
, struct btrfs_path
*path
, struct btrfs_key
1060 *cpu_key
, u32 data_size
);
1061 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1062 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
1063 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1064 *root
, struct buffer_head
*snap
);
1066 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1067 struct btrfs_key
*key
);
1068 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1069 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1071 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1072 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1074 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1075 btrfs_root_item
*item
, struct btrfs_key
*key
);
1077 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1078 *root
, const char *name
, int name_len
, u64 dir
,
1079 struct btrfs_key
*location
, u8 type
);
1080 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1081 struct btrfs_root
*root
,
1082 struct btrfs_path
*path
, u64 dir
,
1083 const char *name
, int name_len
,
1085 struct btrfs_dir_item
*
1086 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1087 struct btrfs_root
*root
,
1088 struct btrfs_path
*path
, u64 dir
,
1089 u64 objectid
, const char *name
, int name_len
,
1091 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1092 struct btrfs_path
*path
,
1093 const char *name
, int name_len
);
1094 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1095 struct btrfs_root
*root
,
1096 struct btrfs_path
*path
,
1097 struct btrfs_dir_item
*di
);
1099 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1100 struct btrfs_root
*fs_root
,
1101 u64 dirid
, u64
*objectid
);
1102 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1105 int btrfs_insert_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1106 *root
, u64 objectid
, struct btrfs_inode_item
1108 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1109 *root
, struct btrfs_path
*path
,
1110 struct btrfs_key
*location
, int mod
);
1113 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1114 struct btrfs_root
*root
,
1115 u64 objectid
, u64 pos
, u64 offset
,
1117 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1118 struct btrfs_root
*root
,
1119 struct btrfs_path
*path
, u64 objectid
,
1120 u64 blocknr
, int mod
);
1121 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1122 struct btrfs_root
*root
,
1123 u64 objectid
, u64 offset
,
1124 char *data
, size_t len
);
1125 int btrfs_csum_verify_file_block(struct btrfs_root
*root
,
1126 u64 objectid
, u64 offset
,
1127 char *data
, size_t len
);
1128 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1129 struct btrfs_root
*root
,
1130 struct btrfs_path
*path
,
1131 u64 objectid
, u64 offset
,
1134 extern struct subsystem btrfs_subsys
;