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_FS_TREE_OBJECTID 3ULL
18 #define BTRFS_FIRST_FREE_OBJECTID 4ULL
21 * we can actually store much bigger names, but lets not confuse the rest
24 #define BTRFS_NAME_LEN 255
26 /* 32 bytes in various csum fields */
27 #define BTRFS_CSUM_SIZE 32
30 * the key defines the order in the tree, and so it also defines (optimal)
31 * block layout. objectid corresonds to the inode number. The flags
32 * tells us things about the object, and is a kind of stream selector.
33 * so for a given inode, keys with flags of 1 might refer to the inode
34 * data, flags of 2 may point to file data in the btree and flags == 3
35 * may point to extents.
37 * offset is the starting byte offset for this key in the stream.
39 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
40 * in cpu native order. Otherwise they are identical and their sizes
41 * should be the same (ie both packed)
43 struct btrfs_disk_key {
47 } __attribute__ ((__packed__));
53 } __attribute__ ((__packed__));
56 * every tree block (leaf or node) starts with this header.
59 u8 csum[BTRFS_CSUM_SIZE];
60 u8 fsid[16]; /* FS specific uuid */
61 __le64 blocknr; /* which block this node is supposed to live in */
66 } __attribute__ ((__packed__));
68 #define BTRFS_MAX_LEVEL 8
69 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
70 sizeof(struct btrfs_header)) / \
71 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
72 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
73 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
77 * the super block basically lists the main trees of the FS
78 * it currently lacks any block count etc etc
80 struct btrfs_super_block {
81 u8 csum[BTRFS_CSUM_SIZE];
82 /* the first 3 fields must match struct btrfs_header */
83 u8 fsid[16]; /* FS specific uuid */
84 __le64 blocknr; /* this block number */
91 __le64 root_dir_objectid;
92 } __attribute__ ((__packed__));
95 * A leaf is full of items. offset and size tell us where to find
96 * the item in the leaf (relative to the start of the data area)
99 struct btrfs_disk_key key;
102 } __attribute__ ((__packed__));
105 * leaves have an item area and a data area:
106 * [item0, item1....itemN] [free space] [dataN...data1, data0]
108 * The data is separate from the items to get the keys closer together
112 struct btrfs_header header;
113 struct btrfs_item items[];
114 } __attribute__ ((__packed__));
117 * all non-leaf blocks are nodes, they hold only keys and pointers to
120 struct btrfs_key_ptr {
121 struct btrfs_disk_key key;
123 } __attribute__ ((__packed__));
126 struct btrfs_header header;
127 struct btrfs_key_ptr ptrs[];
128 } __attribute__ ((__packed__));
131 * btrfs_paths remember the path taken from the root down to the leaf.
132 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
133 * to any other levels that are present.
135 * The slots array records the index of the item or block pointer
136 * used while walking the tree.
139 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
140 int slots[BTRFS_MAX_LEVEL];
144 * items in the extent btree are used to record the objectid of the
145 * owner of the block and the number of references
147 struct btrfs_extent_item {
149 } __attribute__ ((__packed__));
151 struct btrfs_inode_timespec {
154 } __attribute__ ((__packed__));
157 * there is no padding here on purpose. If you want to extent the inode,
158 * make a new item type
160 struct btrfs_inode_item {
171 struct btrfs_inode_timespec atime;
172 struct btrfs_inode_timespec ctime;
173 struct btrfs_inode_timespec mtime;
174 struct btrfs_inode_timespec otime;
175 } __attribute__ ((__packed__));
177 /* inline data is just a blob of bytes */
178 struct btrfs_inline_data_item {
180 } __attribute__ ((__packed__));
182 struct btrfs_dir_item {
183 struct btrfs_disk_key location;
187 } __attribute__ ((__packed__));
189 struct btrfs_root_item {
190 struct btrfs_inode_item inode;
197 } __attribute__ ((__packed__));
199 struct btrfs_file_extent_item {
202 * disk space consumed by the extent, checksum blocks are included
206 __le64 disk_num_blocks;
208 * the logical offset in file blocks (no csums)
209 * this extent record is for. This allows a file extent to point
210 * into the middle of an existing extent on disk, sharing it
211 * between two snapshots (useful if some bytes in the middle of the
212 * extent have changed
216 * the logical number of file blocks (no csums included)
219 } __attribute__ ((__packed__));
221 struct btrfs_csum_item {
222 u8 csum[BTRFS_CSUM_SIZE];
223 } __attribute__ ((__packed__));
226 struct btrfs_fs_info {
227 struct btrfs_root *extent_root;
228 struct btrfs_root *tree_root;
229 struct btrfs_key current_insert;
230 struct btrfs_key last_insert;
231 struct radix_tree_root fs_roots_radix;
232 struct radix_tree_root pending_del_radix;
233 struct radix_tree_root pinned_radix;
235 struct btrfs_transaction *running_transaction;
236 struct btrfs_super_block *disk_super;
237 struct buffer_head *sb_buffer;
238 struct super_block *sb;
239 struct inode *btree_inode;
240 struct mutex trans_mutex;
241 struct mutex fs_mutex;
242 struct crypto_hash *hash_tfm;
243 spinlock_t hash_lock;
248 * in ram representation of the tree. extent_root is used for all allocations
249 * and for the extent tree extent_root root. current_insert is used
250 * only for the extent tree.
253 struct buffer_head *node;
254 struct buffer_head *commit_root;
255 struct btrfs_root_item root_item;
256 struct btrfs_key root_key;
257 struct btrfs_fs_info *fs_info;
265 u64 last_inode_alloc;
268 /* the lower bits in the key flags defines the item type */
269 #define BTRFS_KEY_TYPE_MAX 256
270 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
272 #define BTRFS_KEY_OVERFLOW_MAX 128
273 #define BTRFS_KEY_OVERFLOW_SHIFT 8
274 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
277 * inode items have the data typically returned from stat and store other
278 * info about object characteristics. There is one for every file and dir in
281 #define BTRFS_INODE_ITEM_KEY 1
284 * dir items are the name -> inode pointers in a directory. There is one
285 * for every name in a directory.
287 #define BTRFS_DIR_ITEM_KEY 2
288 #define BTRFS_DIR_INDEX_KEY 3
290 * inline data is file data that fits in the btree.
292 #define BTRFS_INLINE_DATA_KEY 4
294 * extent data is for data that can't fit in the btree. It points to
295 * a (hopefully) huge chunk of disk
297 #define BTRFS_EXTENT_DATA_KEY 5
299 * csum items have the checksums for data in the extents
301 #define BTRFS_CSUM_ITEM_KEY 6
304 * root items point to tree roots. There are typically in the root
305 * tree used by the super block to find all the other trees
307 #define BTRFS_ROOT_ITEM_KEY 7
309 * extent items are in the extent map tree. These record which blocks
310 * are used, and how many references there are to each block
312 #define BTRFS_EXTENT_ITEM_KEY 8
315 * string items are for debugging. They just store a short string of
318 #define BTRFS_STRING_ITEM_KEY 9
320 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
322 return le64_to_cpu(i->generation);
325 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
328 i->generation = cpu_to_le64(val);
331 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
333 return le64_to_cpu(i->size);
336 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
338 i->size = cpu_to_le64(val);
341 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
343 return le64_to_cpu(i->nblocks);
346 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
348 i->nblocks = cpu_to_le64(val);
351 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
353 return le32_to_cpu(i->nlink);
356 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
358 i->nlink = cpu_to_le32(val);
361 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
363 return le32_to_cpu(i->uid);
366 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
368 i->uid = cpu_to_le32(val);
371 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
373 return le32_to_cpu(i->gid);
376 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
378 i->gid = cpu_to_le32(val);
381 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
383 return le32_to_cpu(i->mode);
386 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
388 i->mode = cpu_to_le32(val);
391 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
393 return le32_to_cpu(i->rdev);
396 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
398 i->rdev = cpu_to_le32(val);
401 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
403 return le16_to_cpu(i->flags);
406 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
408 i->flags = cpu_to_le16(val);
411 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
413 return le16_to_cpu(i->compat_flags);
416 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
419 i->compat_flags = cpu_to_le16(val);
422 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
424 return le64_to_cpu(ts->sec);
427 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
430 ts->sec = cpu_to_le64(val);
433 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
435 return le32_to_cpu(ts->nsec);
438 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
441 ts->nsec = cpu_to_le32(val);
444 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
446 return le32_to_cpu(ei->refs);
449 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
451 ei->refs = cpu_to_le32(val);
454 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
456 return le64_to_cpu(n->ptrs[nr].blockptr);
459 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
462 n->ptrs[nr].blockptr = cpu_to_le64(val);
465 static inline u32 btrfs_item_offset(struct btrfs_item *item)
467 return le32_to_cpu(item->offset);
470 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
472 item->offset = cpu_to_le32(val);
475 static inline u32 btrfs_item_end(struct btrfs_item *item)
477 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
480 static inline u16 btrfs_item_size(struct btrfs_item *item)
482 return le16_to_cpu(item->size);
485 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
487 item->size = cpu_to_le16(val);
490 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
492 return le16_to_cpu(d->flags);
495 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
497 d->flags = cpu_to_le16(val);
500 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
505 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
510 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
512 return le16_to_cpu(d->name_len);
515 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
517 d->name_len = cpu_to_le16(val);
520 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
521 struct btrfs_disk_key *disk)
523 cpu->offset = le64_to_cpu(disk->offset);
524 cpu->flags = le32_to_cpu(disk->flags);
525 cpu->objectid = le64_to_cpu(disk->objectid);
528 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
529 struct btrfs_key *cpu)
531 disk->offset = cpu_to_le64(cpu->offset);
532 disk->flags = cpu_to_le32(cpu->flags);
533 disk->objectid = cpu_to_le64(cpu->objectid);
536 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
538 return le64_to_cpu(disk->objectid);
541 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
544 disk->objectid = cpu_to_le64(val);
547 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
549 return le64_to_cpu(disk->offset);
552 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
555 disk->offset = cpu_to_le64(val);
558 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
560 return le32_to_cpu(disk->flags);
563 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
566 disk->flags = cpu_to_le32(val);
569 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
571 u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
572 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
575 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
577 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
578 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
579 key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
582 static inline u32 btrfs_key_type(struct btrfs_key *key)
584 return key->flags & BTRFS_KEY_TYPE_MASK;
587 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
589 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
592 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
594 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
595 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
598 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
600 u32 flags = btrfs_disk_key_flags(key);
601 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
602 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
603 btrfs_set_disk_key_flags(key, flags);
606 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
608 u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
609 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
612 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
615 u32 flags = btrfs_disk_key_flags(key);
616 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
617 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
618 flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
619 btrfs_set_disk_key_flags(key, flags);
622 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
624 return le64_to_cpu(h->blocknr);
627 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
629 h->blocknr = cpu_to_le64(blocknr);
632 static inline u64 btrfs_header_generation(struct btrfs_header *h)
634 return le64_to_cpu(h->generation);
637 static inline void btrfs_set_header_generation(struct btrfs_header *h,
640 h->generation = cpu_to_le64(val);
643 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
645 return le16_to_cpu(h->nritems);
648 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
650 h->nritems = cpu_to_le16(val);
653 static inline u16 btrfs_header_flags(struct btrfs_header *h)
655 return le16_to_cpu(h->flags);
658 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
660 h->flags = cpu_to_le16(val);
663 static inline int btrfs_header_level(struct btrfs_header *h)
668 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
670 BUG_ON(level > BTRFS_MAX_LEVEL);
674 static inline int btrfs_is_leaf(struct btrfs_node *n)
676 return (btrfs_header_level(&n->header) == 0);
679 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
681 return le64_to_cpu(item->blocknr);
684 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
686 item->blocknr = cpu_to_le64(val);
689 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
691 return le64_to_cpu(item->root_dirid);
694 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
696 item->root_dirid = cpu_to_le64(val);
699 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
701 return le32_to_cpu(item->refs);
704 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
706 item->refs = cpu_to_le32(val);
709 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
711 return le64_to_cpu(s->blocknr);
714 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
716 s->blocknr = cpu_to_le64(val);
719 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
721 return le64_to_cpu(s->generation);
724 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
727 s->generation = cpu_to_le64(val);
730 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
732 return le64_to_cpu(s->root);
735 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
737 s->root = cpu_to_le64(val);
740 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
742 return le64_to_cpu(s->total_blocks);
745 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
748 s->total_blocks = cpu_to_le64(val);
751 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
753 return le64_to_cpu(s->blocks_used);
756 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
759 s->blocks_used = cpu_to_le64(val);
762 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
764 return le32_to_cpu(s->blocksize);
767 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
770 s->blocksize = cpu_to_le32(val);
773 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
775 return le64_to_cpu(s->root_dir_objectid);
778 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
781 s->root_dir_objectid = cpu_to_le64(val);
784 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
786 return (u8 *)l->items;
789 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
792 return le64_to_cpu(e->disk_blocknr);
795 static inline void btrfs_set_file_extent_disk_blocknr(struct
796 btrfs_file_extent_item
799 e->disk_blocknr = cpu_to_le64(val);
802 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
804 return le64_to_cpu(e->generation);
807 static inline void btrfs_set_file_extent_generation(struct
808 btrfs_file_extent_item *e,
811 e->generation = cpu_to_le64(val);
814 static inline u64 btrfs_file_extent_disk_num_blocks(struct
815 btrfs_file_extent_item *e)
817 return le64_to_cpu(e->disk_num_blocks);
820 static inline void btrfs_set_file_extent_disk_num_blocks(struct
821 btrfs_file_extent_item
824 e->disk_num_blocks = cpu_to_le64(val);
827 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
829 return le64_to_cpu(e->offset);
832 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
835 e->offset = cpu_to_le64(val);
838 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
841 return le64_to_cpu(e->num_blocks);
844 static inline void btrfs_set_file_extent_num_blocks(struct
845 btrfs_file_extent_item *e,
848 e->num_blocks = cpu_to_le64(val);
851 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
853 return sb->s_fs_info;
856 static inline void btrfs_check_bounds(void *vptr, size_t len,
857 void *vcontainer, size_t container_len)
860 char *container = vcontainer;
861 WARN_ON(ptr < container);
862 WARN_ON(ptr + len > container + container_len);
865 static inline void btrfs_memcpy(struct btrfs_root *root,
867 void *dst, const void *src, size_t nr)
869 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
870 memcpy(dst, src, nr);
873 static inline void btrfs_memmove(struct btrfs_root *root,
875 void *dst, void *src, size_t nr)
877 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
878 memmove(dst, src, nr);
881 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
883 WARN_ON(!atomic_read(&bh->b_count));
884 mark_buffer_dirty(bh);
887 /* helper function to cast into the data area of the leaf. */
888 #define btrfs_item_ptr(leaf, slot, type) \
889 ((type *)(btrfs_leaf_data(leaf) + \
890 btrfs_item_offset((leaf)->items + (slot))))
893 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
894 struct btrfs_root *root);
895 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
896 struct btrfs_root *root);
897 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
898 *root, u64 num_blocks, u64 search_start, u64
899 search_end, struct btrfs_key *ins);
900 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
901 struct buffer_head *buf);
902 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
903 *root, u64 blocknr, u64 num_blocks, int pin);
904 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
907 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
908 *root, struct btrfs_key *key, struct btrfs_path *p, int
910 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
911 struct btrfs_path *btrfs_alloc_path(void);
912 void btrfs_free_path(struct btrfs_path *p);
913 void btrfs_init_path(struct btrfs_path *p);
914 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
915 struct btrfs_path *path);
916 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
917 *root, struct btrfs_key *key, void *data, u32 data_size);
918 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
919 *root, struct btrfs_path *path, struct btrfs_key
920 *cpu_key, u32 data_size);
921 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
922 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
923 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
924 *root, struct buffer_head *snap);
926 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
927 struct btrfs_key *key);
928 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
929 *root, struct btrfs_key *key, struct btrfs_root_item
931 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
932 *root, struct btrfs_key *key, struct btrfs_root_item
934 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
935 btrfs_root_item *item, struct btrfs_key *key);
937 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
938 *root, const char *name, int name_len, u64 dir,
939 struct btrfs_key *location, u8 type);
940 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
941 *root, struct btrfs_path *path, u64 dir,
942 const char *name, int name_len, int mod);
943 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
944 struct btrfs_root *root,
945 struct btrfs_path *path, u64 dir,
946 u64 objectid, int mod);
947 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
948 const char *name, int name_len);
950 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
951 struct btrfs_root *fs_root,
952 u64 dirid, u64 *objectid);
953 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
956 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
957 *root, u64 objectid, struct btrfs_inode_item
959 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
960 *root, struct btrfs_path *path,
961 struct btrfs_key *location, int mod);
964 int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
965 struct btrfs_root *root,
966 u64 objectid, u64 offset,
967 u64 num_blocks, u64 hint_block,
969 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
970 struct btrfs_root *root,
971 struct btrfs_path *path, u64 objectid,
972 u64 blocknr, int mod);
973 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
974 struct btrfs_root *root,
975 u64 objectid, u64 offset,
976 char *data, size_t len);
977 int btrfs_csum_verify_file_block(struct btrfs_root *root,
978 u64 objectid, u64 offset,
979 char *data, size_t len);
981 extern struct subsystem btrfs_subsys;