7 struct btrfs_trans_handle;
8 struct btrfs_transaction;
10 #define BTRFS_MAGIC "_BtRfS_M"
12 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
13 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
14 #define BTRFS_INODE_MAP_OBJECTID 3ULL
15 #define BTRFS_FS_TREE_OBJECTID 4ULL
16 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
19 * we can actually store much bigger names, but lets not confuse the rest
22 #define BTRFS_NAME_LEN 255
25 * the key defines the order in the tree, and so it also defines (optimal)
26 * block layout. objectid corresonds to the inode number. The flags
27 * tells us things about the object, and is a kind of stream selector.
28 * so for a given inode, keys with flags of 1 might refer to the inode
29 * data, flags of 2 may point to file data in the btree and flags == 3
30 * may point to extents.
32 * offset is the starting byte offset for this key in the stream.
34 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
35 * in cpu native order. Otherwise they are identical and their sizes
36 * should be the same (ie both packed)
38 struct btrfs_disk_key {
42 } __attribute__ ((__packed__));
48 } __attribute__ ((__packed__));
51 * every tree block (leaf or node) starts with this header.
54 u8 fsid[16]; /* FS specific uuid */
55 __le64 blocknr; /* which block this node is supposed to live in */
57 __le64 parentid; /* objectid of the tree root */
63 } __attribute__ ((__packed__));
65 #define BTRFS_MAX_LEVEL 8
66 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
67 sizeof(struct btrfs_header)) / \
68 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
69 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
70 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
74 * the super block basically lists the main trees of the FS
75 * it currently lacks any block count etc etc
77 struct btrfs_super_block {
78 u8 fsid[16]; /* FS specific uuid */
79 __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 buffer_head *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 {
146 } __attribute__ ((__packed__));
148 struct btrfs_inode_timespec {
151 } __attribute__ ((__packed__));
154 * there is no padding here on purpose. If you want to extent the inode,
155 * make a new item type
157 struct btrfs_inode_item {
168 struct btrfs_inode_timespec atime;
169 struct btrfs_inode_timespec ctime;
170 struct btrfs_inode_timespec mtime;
171 struct btrfs_inode_timespec otime;
172 } __attribute__ ((__packed__));
174 /* inline data is just a blob of bytes */
175 struct btrfs_inline_data_item {
177 } __attribute__ ((__packed__));
179 struct btrfs_dir_item {
184 } __attribute__ ((__packed__));
186 struct btrfs_root_item {
192 } __attribute__ ((__packed__));
194 struct btrfs_file_extent_item {
197 * disk space consumed by the extent, checksum blocks are included
201 __le64 disk_num_blocks;
203 * the logical offset in file blocks (no csums)
204 * this extent record is for. This allows a file extent to point
205 * into the middle of an existing extent on disk, sharing it
206 * between two snapshots (useful if some bytes in the middle of the
207 * extent have changed
211 * the logical number of file blocks (no csums included)
214 } __attribute__ ((__packed__));
216 struct btrfs_inode_map_item {
217 struct btrfs_disk_key key;
218 } __attribute__ ((__packed__));
220 struct btrfs_fs_info {
221 struct btrfs_root *fs_root;
222 struct btrfs_root *extent_root;
223 struct btrfs_root *tree_root;
224 struct btrfs_root *inode_root;
225 struct btrfs_key current_insert;
226 struct btrfs_key last_insert;
227 struct radix_tree_root pending_del_radix;
228 struct radix_tree_root pinned_radix;
229 u64 last_inode_alloc;
230 u64 last_inode_alloc_dirid;
232 struct btrfs_transaction *running_transaction;
233 struct btrfs_super_block *disk_super;
234 struct buffer_head *sb_buffer;
235 struct super_block *sb;
236 struct mutex trans_mutex;
237 struct mutex fs_mutex;
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 buffer_head *node;
247 struct buffer_head *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)
261 * inode items have the data typically returned from stat and store other
262 * info about object characteristics. There is one for every file and dir in
265 #define BTRFS_INODE_ITEM_KEY 1
268 * dir items are the name -> inode pointers in a directory. There is one
269 * for every name in a directory.
271 #define BTRFS_DIR_ITEM_KEY 2
273 * inline data is file data that fits in the btree.
275 #define BTRFS_INLINE_DATA_KEY 3
277 * extent data is for data that can't fit in the btree. It points to
278 * a (hopefully) huge chunk of disk
280 #define BTRFS_EXTENT_DATA_KEY 4
282 * root items point to tree roots. There are typically in the root
283 * tree used by the super block to find all the other trees
285 #define BTRFS_ROOT_ITEM_KEY 5
287 * extent items are in the extent map tree. These record which blocks
288 * are used, and how many references there are to each block
290 #define BTRFS_EXTENT_ITEM_KEY 6
293 * the inode map records which inode numbers are in use and where
294 * they actually live on disk
296 #define BTRFS_INODE_MAP_ITEM_KEY 7
298 * string items are for debugging. They just store a short string of
301 #define BTRFS_STRING_ITEM_KEY 8
303 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
305 return le64_to_cpu(i->generation);
308 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
311 i->generation = cpu_to_le64(val);
314 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
316 return le64_to_cpu(i->size);
319 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
321 i->size = cpu_to_le64(val);
324 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
326 return le64_to_cpu(i->nblocks);
329 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
331 i->nblocks = cpu_to_le64(val);
334 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
336 return le32_to_cpu(i->nlink);
339 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
341 i->nlink = cpu_to_le32(val);
344 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
346 return le32_to_cpu(i->uid);
349 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
351 i->uid = cpu_to_le32(val);
354 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
356 return le32_to_cpu(i->gid);
359 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
361 i->gid = cpu_to_le32(val);
364 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
366 return le32_to_cpu(i->mode);
369 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
371 i->mode = cpu_to_le32(val);
374 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
376 return le32_to_cpu(i->rdev);
379 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
381 i->rdev = cpu_to_le32(val);
384 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
386 return le16_to_cpu(i->flags);
389 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
391 i->flags = cpu_to_le16(val);
394 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
396 return le16_to_cpu(i->compat_flags);
399 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
402 i->compat_flags = cpu_to_le16(val);
405 static inline u32 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
407 return le32_to_cpu(ts->sec);
410 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
413 ts->sec = cpu_to_le32(val);
416 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
418 return le32_to_cpu(ts->nsec);
421 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
424 ts->nsec = cpu_to_le32(val);
429 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
431 return le64_to_cpu(ei->owner);
434 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
436 ei->owner = cpu_to_le64(val);
439 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
441 return le32_to_cpu(ei->refs);
444 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
446 ei->refs = cpu_to_le32(val);
449 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
451 return le64_to_cpu(n->ptrs[nr].blockptr);
454 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
457 n->ptrs[nr].blockptr = cpu_to_le64(val);
460 static inline u32 btrfs_item_offset(struct btrfs_item *item)
462 return le32_to_cpu(item->offset);
465 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
467 item->offset = cpu_to_le32(val);
470 static inline u32 btrfs_item_end(struct btrfs_item *item)
472 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
475 static inline u16 btrfs_item_size(struct btrfs_item *item)
477 return le16_to_cpu(item->size);
480 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
482 item->size = cpu_to_le16(val);
485 static inline u64 btrfs_dir_objectid(struct btrfs_dir_item *d)
487 return le64_to_cpu(d->objectid);
490 static inline void btrfs_set_dir_objectid(struct btrfs_dir_item *d, u64 val)
492 d->objectid = cpu_to_le64(val);
495 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
497 return le16_to_cpu(d->flags);
500 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
502 d->flags = cpu_to_le16(val);
505 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
510 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
515 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
517 return le16_to_cpu(d->name_len);
520 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
522 d->name_len = cpu_to_le16(val);
525 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
526 struct btrfs_disk_key *disk)
528 cpu->offset = le64_to_cpu(disk->offset);
529 cpu->flags = le32_to_cpu(disk->flags);
530 cpu->objectid = le64_to_cpu(disk->objectid);
533 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
534 struct btrfs_key *cpu)
536 disk->offset = cpu_to_le64(cpu->offset);
537 disk->flags = cpu_to_le32(cpu->flags);
538 disk->objectid = cpu_to_le64(cpu->objectid);
541 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
543 return le64_to_cpu(disk->objectid);
546 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
549 disk->objectid = cpu_to_le64(val);
552 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
554 return le64_to_cpu(disk->offset);
557 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
560 disk->offset = cpu_to_le64(val);
563 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
565 return le32_to_cpu(disk->flags);
568 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
571 disk->flags = cpu_to_le32(val);
574 static inline u32 btrfs_key_type(struct btrfs_key *key)
576 return key->flags & BTRFS_KEY_TYPE_MASK;
579 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
581 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
584 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
586 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
587 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
590 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
592 u32 flags = btrfs_disk_key_flags(key);
593 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
594 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
595 btrfs_set_disk_key_flags(key, flags);
598 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
600 return le64_to_cpu(h->blocknr);
603 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
605 h->blocknr = cpu_to_le64(blocknr);
608 static inline u64 btrfs_header_generation(struct btrfs_header *h)
610 return le64_to_cpu(h->generation);
613 static inline void btrfs_set_header_generation(struct btrfs_header *h,
616 h->generation = cpu_to_le64(val);
619 static inline u64 btrfs_header_parentid(struct btrfs_header *h)
621 return le64_to_cpu(h->parentid);
624 static inline void btrfs_set_header_parentid(struct btrfs_header *h,
627 h->parentid = cpu_to_le64(parentid);
630 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
632 return le16_to_cpu(h->nritems);
635 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
637 h->nritems = cpu_to_le16(val);
640 static inline u16 btrfs_header_flags(struct btrfs_header *h)
642 return le16_to_cpu(h->flags);
645 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
647 h->flags = cpu_to_le16(val);
650 static inline int btrfs_header_level(struct btrfs_header *h)
655 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
657 BUG_ON(level > BTRFS_MAX_LEVEL);
661 static inline int btrfs_is_leaf(struct btrfs_node *n)
663 return (btrfs_header_level(&n->header) == 0);
666 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
668 return le64_to_cpu(item->blocknr);
671 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
673 item->blocknr = cpu_to_le64(val);
676 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
678 return le32_to_cpu(item->refs);
681 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
683 item->refs = cpu_to_le32(val);
686 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
688 return le64_to_cpu(s->blocknr);
691 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
693 s->blocknr = cpu_to_le64(val);
696 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
698 return le64_to_cpu(s->root);
701 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
703 s->root = cpu_to_le64(val);
706 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
708 return le64_to_cpu(s->total_blocks);
711 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
714 s->total_blocks = cpu_to_le64(val);
717 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
719 return le64_to_cpu(s->blocks_used);
722 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
725 s->blocks_used = cpu_to_le64(val);
728 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
730 return le32_to_cpu(s->blocksize);
733 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
736 s->blocksize = cpu_to_le32(val);
739 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
741 return le64_to_cpu(s->root_dir_objectid);
744 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
747 s->root_dir_objectid = cpu_to_le64(val);
750 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
752 return (u8 *)l->items;
755 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
758 return le64_to_cpu(e->disk_blocknr);
761 static inline void btrfs_set_file_extent_disk_blocknr(struct
762 btrfs_file_extent_item
765 e->disk_blocknr = cpu_to_le64(val);
768 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
770 return le64_to_cpu(e->generation);
773 static inline void btrfs_set_file_extent_generation(struct
774 btrfs_file_extent_item *e,
777 e->generation = cpu_to_le64(val);
780 static inline u64 btrfs_file_extent_disk_num_blocks(struct
781 btrfs_file_extent_item *e)
783 return le64_to_cpu(e->disk_num_blocks);
786 static inline void btrfs_set_file_extent_disk_num_blocks(struct
787 btrfs_file_extent_item
790 e->disk_num_blocks = cpu_to_le64(val);
793 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
795 return le64_to_cpu(e->offset);
798 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
801 e->offset = cpu_to_le64(val);
804 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
807 return le64_to_cpu(e->num_blocks);
810 static inline void btrfs_set_file_extent_num_blocks(struct
811 btrfs_file_extent_item *e,
814 e->num_blocks = cpu_to_le64(val);
817 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
819 return sb->s_fs_info;
822 /* helper function to cast into the data area of the leaf. */
823 #define btrfs_item_ptr(leaf, slot, type) \
824 ((type *)(btrfs_leaf_data(leaf) + \
825 btrfs_item_offset((leaf)->items + (slot))))
828 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
829 struct btrfs_root *root);
830 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
831 *root, u64 num_blocks, u64 search_start, u64
832 search_end, u64 owner, struct btrfs_key *ins);
833 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
834 struct buffer_head *buf);
835 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
836 *root, u64 blocknr, u64 num_blocks, int pin);
837 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
840 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
841 *root, struct btrfs_key *key, struct btrfs_path *p, int
843 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
844 void btrfs_init_path(struct btrfs_path *p);
845 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
846 struct btrfs_path *path);
847 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
848 *root, struct btrfs_key *key, void *data, u32 data_size);
849 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
850 *root, struct btrfs_path *path, struct btrfs_key
851 *cpu_key, u32 data_size);
852 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
853 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
854 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
855 *root, struct buffer_head *snap);
857 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
858 struct btrfs_key *key);
859 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
860 *root, struct btrfs_key *key, struct btrfs_root_item
862 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
863 *root, struct btrfs_key *key, struct btrfs_root_item
865 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
866 btrfs_root_item *item, struct btrfs_key *key);
868 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
869 *root, const char *name, int name_len, u64 dir, u64
871 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
872 *root, struct btrfs_path *path, u64 dir,
873 const char *name, int name_len, int mod);
874 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
875 const char *name, int name_len);
877 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
878 struct btrfs_root *fs_root,
879 u64 dirid, u64 *objectid);
880 int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
881 struct btrfs_root *root,
882 u64 objectid, struct btrfs_key *location);
883 int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
884 struct btrfs_root *root, struct btrfs_path *path,
885 u64 objectid, int mod);
887 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
888 *root, u64 objectid, struct btrfs_inode_item
890 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
891 *root, struct btrfs_path *path, u64 objectid, int mod);
894 int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
895 struct btrfs_root *root,
896 u64 objectid, u64 offset,
897 u64 num_blocks, u64 hint_block,
899 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
900 struct btrfs_root *root,
901 struct btrfs_path *path, u64 objectid,
902 u64 blocknr, int mod);