5 #include "kerncompat.h"
7 struct btrfs_trans_handle;
9 #define BTRFS_MAGIC "_BtRfS_M"
11 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
12 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
13 #define BTRFS_FS_TREE_OBJECTID 3ULL
14 #define BTRFS_FIRST_FREE_OBJECTID 4ULL
17 * we can actually store much bigger names, but lets not confuse the rest
20 #define BTRFS_NAME_LEN 255
22 /* 32 bytes in various csum fields */
23 #define BTRFS_CSUM_SIZE 32
26 * the key defines the order in the tree, and so it also defines (optimal)
27 * block layout. objectid corresonds to the inode number. The flags
28 * tells us things about the object, and is a kind of stream selector.
29 * so for a given inode, keys with flags of 1 might refer to the inode
30 * data, flags of 2 may point to file data in the btree and flags == 3
31 * may point to extents.
33 * offset is the starting byte offset for this key in the stream.
35 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
36 * in cpu native order. Otherwise they are identical and their sizes
37 * should be the same (ie both packed)
39 struct btrfs_disk_key {
43 } __attribute__ ((__packed__));
49 } __attribute__ ((__packed__));
52 * every tree block (leaf or node) starts with this header.
55 u8 csum[BTRFS_CSUM_SIZE];
56 u8 fsid[16]; /* FS specific uuid */
57 __le64 blocknr; /* which block this node is supposed to live in */
62 } __attribute__ ((__packed__));
64 #define BTRFS_MAX_LEVEL 8
65 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
66 sizeof(struct btrfs_header)) / \
67 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
68 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
69 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
73 * the super block basically lists the main trees of the FS
74 * it currently lacks any block count etc etc
76 struct btrfs_super_block {
77 u8 csum[BTRFS_CSUM_SIZE];
78 /* the first 3 fields must match struct btrfs_header */
79 u8 fsid[16]; /* FS specific uuid */
80 __le64 blocknr; /* this block number */
87 __le64 root_dir_objectid;
88 } __attribute__ ((__packed__));
91 * A leaf is full of items. offset and size tell us where to find
92 * the item in the leaf (relative to the start of the data area)
95 struct btrfs_disk_key key;
98 } __attribute__ ((__packed__));
101 * leaves have an item area and a data area:
102 * [item0, item1....itemN] [free space] [dataN...data1, data0]
104 * The data is separate from the items to get the keys closer together
108 struct btrfs_header header;
109 struct btrfs_item items[];
110 } __attribute__ ((__packed__));
113 * all non-leaf blocks are nodes, they hold only keys and pointers to
116 struct btrfs_key_ptr {
117 struct btrfs_disk_key key;
119 } __attribute__ ((__packed__));
122 struct btrfs_header header;
123 struct btrfs_key_ptr ptrs[];
124 } __attribute__ ((__packed__));
127 * btrfs_paths remember the path taken from the root down to the leaf.
128 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
129 * to any other levels that are present.
131 * The slots array records the index of the item or block pointer
132 * used while walking the tree.
135 struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL];
136 int slots[BTRFS_MAX_LEVEL];
140 * items in the extent btree are used to record the objectid of the
141 * owner of the block and the number of references
143 struct btrfs_extent_item {
145 } __attribute__ ((__packed__));
147 struct btrfs_inode_timespec {
150 } __attribute__ ((__packed__));
153 * there is no padding here on purpose. If you want to extent the inode,
154 * make a new item type
156 struct btrfs_inode_item {
167 struct btrfs_inode_timespec atime;
168 struct btrfs_inode_timespec ctime;
169 struct btrfs_inode_timespec mtime;
170 struct btrfs_inode_timespec otime;
171 } __attribute__ ((__packed__));
173 /* inline data is just a blob of bytes */
174 struct btrfs_inline_data_item {
176 } __attribute__ ((__packed__));
178 struct btrfs_dir_item {
179 struct btrfs_disk_key location;
183 } __attribute__ ((__packed__));
185 struct btrfs_root_item {
186 struct btrfs_inode_item inode;
193 } __attribute__ ((__packed__));
195 struct btrfs_file_extent_item {
198 * disk space consumed by the extent, checksum blocks are included
202 __le64 disk_num_blocks;
204 * the logical offset in file blocks (no csums)
205 * this extent record is for. This allows a file extent to point
206 * into the middle of an existing extent on disk, sharing it
207 * between two snapshots (useful if some bytes in the middle of the
208 * extent have changed
212 * the logical number of file blocks (no csums included)
215 } __attribute__ ((__packed__));
217 struct btrfs_csum_item {
218 u8 csum[BTRFS_CSUM_SIZE];
219 } __attribute__ ((__packed__));
221 struct btrfs_fs_info {
222 struct btrfs_root *fs_root;
223 struct btrfs_root *extent_root;
224 struct btrfs_root *tree_root;
225 struct btrfs_key current_insert;
226 struct btrfs_key last_insert;
227 struct radix_tree_root cache_radix;
228 struct radix_tree_root pinned_radix;
229 struct list_head trans;
230 struct list_head cache;
231 u64 last_inode_alloc;
232 u64 last_inode_alloc_dirid;
236 struct btrfs_trans_handle *running_transaction;
237 struct btrfs_super_block *disk_super;
241 * in ram representation of the tree. extent_root is used for all allocations
242 * and for the extent tree extent_root root. current_insert is used
243 * only for the extent tree.
246 struct btrfs_buffer *node;
247 struct btrfs_buffer *commit_root;
248 struct btrfs_root_item root_item;
249 struct btrfs_key root_key;
250 struct btrfs_fs_info *fs_info;
256 /* the lower bits in the key flags defines the item type */
257 #define BTRFS_KEY_TYPE_MAX 256
258 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
260 #define BTRFS_KEY_OVERFLOW_MAX 128
261 #define BTRFS_KEY_OVERFLOW_SHIFT 8
262 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
265 * inode items have the data typically returned from stat and store other
266 * info about object characteristics. There is one for every file and dir in
269 #define BTRFS_INODE_ITEM_KEY 1
272 * dir items are the name -> inode pointers in a directory. There is one
273 * for every name in a directory.
275 #define BTRFS_DIR_ITEM_KEY 2
276 #define BTRFS_DIR_INDEX_KEY 3
278 * inline data is file data that fits in the btree.
280 #define BTRFS_INLINE_DATA_KEY 4
282 * extent data is for data that can't fit in the btree. It points to
283 * a (hopefully) huge chunk of disk
285 #define BTRFS_EXTENT_DATA_KEY 5
287 * csum items have the checksums for data in the extents
289 #define BTRFS_CSUM_ITEM_KEY 6
292 * root items point to tree roots. There are typically in the root
293 * tree used by the super block to find all the other trees
295 #define BTRFS_ROOT_ITEM_KEY 7
297 * extent items are in the extent map tree. These record which blocks
298 * are used, and how many references there are to each block
300 #define BTRFS_EXTENT_ITEM_KEY 8
303 * string items are for debugging. They just store a short string of
306 #define BTRFS_STRING_ITEM_KEY 9
308 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
310 return le64_to_cpu(i->generation);
313 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
316 i->generation = cpu_to_le64(val);
319 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
321 return le64_to_cpu(i->size);
324 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
326 i->size = cpu_to_le64(val);
329 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
331 return le64_to_cpu(i->nblocks);
334 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
336 i->nblocks = cpu_to_le64(val);
339 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
341 return le32_to_cpu(i->nlink);
344 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
346 i->nlink = cpu_to_le32(val);
349 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
351 return le32_to_cpu(i->uid);
354 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
356 i->uid = cpu_to_le32(val);
359 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
361 return le32_to_cpu(i->gid);
364 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
366 i->gid = cpu_to_le32(val);
369 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
371 return le32_to_cpu(i->mode);
374 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
376 i->mode = cpu_to_le32(val);
379 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
381 return le32_to_cpu(i->rdev);
384 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
386 i->rdev = cpu_to_le32(val);
389 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
391 return le16_to_cpu(i->flags);
394 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
396 i->flags = cpu_to_le16(val);
399 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
401 return le16_to_cpu(i->compat_flags);
404 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
407 i->compat_flags = cpu_to_le16(val);
410 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
412 return le64_to_cpu(ts->sec);
415 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
418 ts->sec = cpu_to_le64(val);
421 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
423 return le32_to_cpu(ts->nsec);
426 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
429 ts->nsec = cpu_to_le32(val);
432 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
434 return le32_to_cpu(ei->refs);
437 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
439 ei->refs = cpu_to_le32(val);
442 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
444 return le64_to_cpu(n->ptrs[nr].blockptr);
447 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
450 n->ptrs[nr].blockptr = cpu_to_le64(val);
453 static inline u32 btrfs_item_offset(struct btrfs_item *item)
455 return le32_to_cpu(item->offset);
458 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
460 item->offset = cpu_to_le32(val);
463 static inline u32 btrfs_item_end(struct btrfs_item *item)
465 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
468 static inline u16 btrfs_item_size(struct btrfs_item *item)
470 return le16_to_cpu(item->size);
473 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
475 item->size = cpu_to_le16(val);
478 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
480 return le16_to_cpu(d->flags);
483 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
485 d->flags = cpu_to_le16(val);
488 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
493 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
498 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
500 return le16_to_cpu(d->name_len);
503 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
505 d->name_len = cpu_to_le16(val);
508 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
509 struct btrfs_disk_key *disk)
511 cpu->offset = le64_to_cpu(disk->offset);
512 cpu->flags = le32_to_cpu(disk->flags);
513 cpu->objectid = le64_to_cpu(disk->objectid);
516 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
517 struct btrfs_key *cpu)
519 disk->offset = cpu_to_le64(cpu->offset);
520 disk->flags = cpu_to_le32(cpu->flags);
521 disk->objectid = cpu_to_le64(cpu->objectid);
524 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
526 return le64_to_cpu(disk->objectid);
529 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
532 disk->objectid = cpu_to_le64(val);
535 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
537 return le64_to_cpu(disk->offset);
540 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
543 disk->offset = cpu_to_le64(val);
546 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
548 return le32_to_cpu(disk->flags);
551 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
554 disk->flags = cpu_to_le32(val);
557 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
559 u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
560 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
563 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
565 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
566 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
567 key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
570 static inline u32 btrfs_key_type(struct btrfs_key *key)
572 return key->flags & BTRFS_KEY_TYPE_MASK;
575 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
577 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
580 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
582 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
583 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
586 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
588 u32 flags = btrfs_disk_key_flags(key);
589 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
590 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
591 btrfs_set_disk_key_flags(key, flags);
594 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
596 u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
597 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
600 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
603 u32 flags = btrfs_disk_key_flags(key);
604 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
605 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
606 flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
607 btrfs_set_disk_key_flags(key, flags);
610 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
612 return le64_to_cpu(h->blocknr);
615 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
617 h->blocknr = cpu_to_le64(blocknr);
620 static inline u64 btrfs_header_generation(struct btrfs_header *h)
622 return le64_to_cpu(h->generation);
625 static inline void btrfs_set_header_generation(struct btrfs_header *h,
628 h->generation = cpu_to_le64(val);
631 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
633 return le16_to_cpu(h->nritems);
636 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
638 h->nritems = cpu_to_le16(val);
641 static inline u16 btrfs_header_flags(struct btrfs_header *h)
643 return le16_to_cpu(h->flags);
646 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
648 h->flags = cpu_to_le16(val);
651 static inline int btrfs_header_level(struct btrfs_header *h)
656 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
658 BUG_ON(level > BTRFS_MAX_LEVEL);
662 static inline int btrfs_is_leaf(struct btrfs_node *n)
664 return (btrfs_header_level(&n->header) == 0);
667 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
669 return le64_to_cpu(item->blocknr);
672 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
674 item->blocknr = cpu_to_le64(val);
677 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
679 return le64_to_cpu(item->root_dirid);
682 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
684 item->root_dirid = cpu_to_le64(val);
687 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
689 return le32_to_cpu(item->refs);
692 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
694 item->refs = cpu_to_le32(val);
697 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
699 return le64_to_cpu(s->blocknr);
702 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
704 s->blocknr = cpu_to_le64(val);
707 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
709 return le64_to_cpu(s->generation);
712 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
715 s->generation = cpu_to_le64(val);
718 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
720 return le64_to_cpu(s->root);
723 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
725 s->root = cpu_to_le64(val);
728 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
730 return le64_to_cpu(s->total_blocks);
733 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
736 s->total_blocks = cpu_to_le64(val);
739 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
741 return le64_to_cpu(s->blocks_used);
744 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
747 s->blocks_used = cpu_to_le64(val);
750 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
752 return le32_to_cpu(s->blocksize);
755 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
758 s->blocksize = cpu_to_le32(val);
761 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
763 return le64_to_cpu(s->root_dir_objectid);
766 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
769 s->root_dir_objectid = cpu_to_le64(val);
772 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
774 return (u8 *)l->items;
777 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
780 return le64_to_cpu(e->disk_blocknr);
783 static inline void btrfs_set_file_extent_disk_blocknr(struct
784 btrfs_file_extent_item
787 e->disk_blocknr = cpu_to_le64(val);
790 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
792 return le64_to_cpu(e->generation);
795 static inline void btrfs_set_file_extent_generation(struct
796 btrfs_file_extent_item *e,
799 e->generation = cpu_to_le64(val);
802 static inline u64 btrfs_file_extent_disk_num_blocks(struct
803 btrfs_file_extent_item *e)
805 return le64_to_cpu(e->disk_num_blocks);
808 static inline void btrfs_set_file_extent_disk_num_blocks(struct
809 btrfs_file_extent_item
812 e->disk_num_blocks = cpu_to_le64(val);
815 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
817 return le64_to_cpu(e->offset);
820 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
823 e->offset = cpu_to_le64(val);
826 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
829 return le64_to_cpu(e->num_blocks);
832 static inline void btrfs_set_file_extent_num_blocks(struct
833 btrfs_file_extent_item *e,
836 e->num_blocks = cpu_to_le64(val);
839 /* helper function to cast into the data area of the leaf. */
840 #define btrfs_item_ptr(leaf, slot, type) \
841 ((type *)(btrfs_leaf_data(leaf) + \
842 btrfs_item_offset((leaf)->items + (slot))))
844 struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
845 struct btrfs_root *root);
846 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
847 struct btrfs_buffer *buf);
848 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
849 *root, u64 blocknr, u64 num_blocks, int pin);
850 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
851 *root, struct btrfs_key *key, struct btrfs_path *p, int
853 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
854 void btrfs_init_path(struct btrfs_path *p);
855 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
856 struct btrfs_path *path);
857 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
858 *root, struct btrfs_key *key, void *data, u32 data_size);
859 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
860 *root, struct btrfs_path *path, struct btrfs_key
861 *cpu_key, u32 data_size);
862 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
863 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
864 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
865 *root, struct btrfs_buffer *snap);
866 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
868 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
869 struct btrfs_key *key);
870 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
871 *root, struct btrfs_key *key, struct btrfs_root_item
873 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
874 *root, struct btrfs_key *key, struct btrfs_root_item
876 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
877 btrfs_root_item *item, struct btrfs_key *key);
878 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
879 *root, char *name, int name_len, u64 dir,
880 struct btrfs_key *location, u8 type);
881 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
882 *root, struct btrfs_path *path, u64 dir, char *name,
883 int name_len, int mod);
884 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
885 char *name, int name_len);
886 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
887 struct btrfs_root *fs_root,
888 u64 dirid, u64 *objectid);
889 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
890 *root, u64 objectid, struct btrfs_inode_item
892 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
893 *root, struct btrfs_path *path, u64 objectid, int mod);