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_INODE_MAP_OBJECTID 3ULL
18 #define BTRFS_FS_TREE_OBJECTID 4ULL
19 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
22 * we can actually store much bigger names, but lets not confuse the rest
25 #define BTRFS_NAME_LEN 255
27 /* 32 bytes in various csum fields */
28 #define BTRFS_CSUM_SIZE 32
31 * the key defines the order in the tree, and so it also defines (optimal)
32 * block layout. objectid corresonds to the inode number. The flags
33 * tells us things about the object, and is a kind of stream selector.
34 * so for a given inode, keys with flags of 1 might refer to the inode
35 * data, flags of 2 may point to file data in the btree and flags == 3
36 * may point to extents.
38 * offset is the starting byte offset for this key in the stream.
40 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
41 * in cpu native order. Otherwise they are identical and their sizes
42 * should be the same (ie both packed)
44 struct btrfs_disk_key {
48 } __attribute__ ((__packed__));
54 } __attribute__ ((__packed__));
57 * every tree block (leaf or node) starts with this header.
60 u8 csum[BTRFS_CSUM_SIZE];
61 u8 fsid[16]; /* FS specific uuid */
62 __le64 blocknr; /* which block this node is supposed to live in */
64 __le64 parentid; /* objectid of the tree root */
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))
80 * the super block basically lists the main trees of the FS
81 * it currently lacks any block count etc etc
83 struct btrfs_super_block {
84 u8 csum[BTRFS_CSUM_SIZE];
85 /* the first 3 fields must match struct btrfs_header */
86 u8 fsid[16]; /* FS specific uuid */
87 __le64 blocknr; /* this block number */
94 __le64 root_dir_objectid;
95 } __attribute__ ((__packed__));
98 * A leaf is full of items. offset and size tell us where to find
99 * the item in the leaf (relative to the start of the data area)
102 struct btrfs_disk_key key;
105 } __attribute__ ((__packed__));
108 * leaves have an item area and a data area:
109 * [item0, item1....itemN] [free space] [dataN...data1, data0]
111 * The data is separate from the items to get the keys closer together
115 struct btrfs_header header;
116 struct btrfs_item items[];
117 } __attribute__ ((__packed__));
120 * all non-leaf blocks are nodes, they hold only keys and pointers to
123 struct btrfs_key_ptr {
124 struct btrfs_disk_key key;
126 } __attribute__ ((__packed__));
129 struct btrfs_header header;
130 struct btrfs_key_ptr ptrs[];
131 } __attribute__ ((__packed__));
134 * btrfs_paths remember the path taken from the root down to the leaf.
135 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
136 * to any other levels that are present.
138 * The slots array records the index of the item or block pointer
139 * used while walking the tree.
142 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
143 int slots[BTRFS_MAX_LEVEL];
147 * items in the extent btree are used to record the objectid of the
148 * owner of the block and the number of references
150 struct btrfs_extent_item {
153 } __attribute__ ((__packed__));
155 struct btrfs_inode_timespec {
158 } __attribute__ ((__packed__));
161 * there is no padding here on purpose. If you want to extent the inode,
162 * make a new item type
164 struct btrfs_inode_item {
175 struct btrfs_inode_timespec atime;
176 struct btrfs_inode_timespec ctime;
177 struct btrfs_inode_timespec mtime;
178 struct btrfs_inode_timespec otime;
179 } __attribute__ ((__packed__));
181 /* inline data is just a blob of bytes */
182 struct btrfs_inline_data_item {
184 } __attribute__ ((__packed__));
186 struct btrfs_dir_item {
187 struct btrfs_disk_key location;
191 } __attribute__ ((__packed__));
193 struct btrfs_root_item {
194 struct btrfs_inode_item inode;
201 } __attribute__ ((__packed__));
203 struct btrfs_file_extent_item {
206 * disk space consumed by the extent, checksum blocks are included
210 __le64 disk_num_blocks;
212 * the logical offset in file blocks (no csums)
213 * this extent record is for. This allows a file extent to point
214 * into the middle of an existing extent on disk, sharing it
215 * between two snapshots (useful if some bytes in the middle of the
216 * extent have changed
220 * the logical number of file blocks (no csums included)
223 } __attribute__ ((__packed__));
225 struct btrfs_csum_item {
226 u8 csum[BTRFS_CSUM_SIZE];
227 } __attribute__ ((__packed__));
229 struct btrfs_inode_map_item {
230 struct btrfs_disk_key key;
231 } __attribute__ ((__packed__));
234 struct btrfs_fs_info {
235 struct btrfs_root *fs_root;
236 struct btrfs_root *extent_root;
237 struct btrfs_root *tree_root;
238 struct btrfs_root *inode_root;
239 struct btrfs_key current_insert;
240 struct btrfs_key last_insert;
241 struct radix_tree_root pending_del_radix;
242 struct radix_tree_root pinned_radix;
243 u64 last_inode_alloc;
246 struct btrfs_transaction *running_transaction;
247 struct btrfs_super_block *disk_super;
248 struct buffer_head *sb_buffer;
249 struct super_block *sb;
250 struct inode *btree_inode;
251 struct mutex trans_mutex;
252 struct mutex fs_mutex;
253 struct crypto_hash *hash_tfm;
254 spinlock_t hash_lock;
259 * in ram representation of the tree. extent_root is used for all allocations
260 * and for the extent tree extent_root root. current_insert is used
261 * only for the extent tree.
264 struct buffer_head *node;
265 struct buffer_head *commit_root;
266 struct btrfs_root_item root_item;
267 struct btrfs_key root_key;
268 struct btrfs_fs_info *fs_info;
274 /* the lower bits in the key flags defines the item type */
275 #define BTRFS_KEY_TYPE_MAX 256
276 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
278 #define BTRFS_KEY_OVERFLOW_MAX 128
279 #define BTRFS_KEY_OVERFLOW_SHIFT 8
280 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
283 * inode items have the data typically returned from stat and store other
284 * info about object characteristics. There is one for every file and dir in
287 #define BTRFS_INODE_ITEM_KEY 1
290 * dir items are the name -> inode pointers in a directory. There is one
291 * for every name in a directory.
293 #define BTRFS_DIR_ITEM_KEY 2
294 #define BTRFS_DIR_INDEX_KEY 3
296 * inline data is file data that fits in the btree.
298 #define BTRFS_INLINE_DATA_KEY 4
300 * extent data is for data that can't fit in the btree. It points to
301 * a (hopefully) huge chunk of disk
303 #define BTRFS_EXTENT_DATA_KEY 5
305 * csum items have the checksums for data in the extents
307 #define BTRFS_CSUM_ITEM_KEY 6
310 * root items point to tree roots. There are typically in the root
311 * tree used by the super block to find all the other trees
313 #define BTRFS_ROOT_ITEM_KEY 7
315 * extent items are in the extent map tree. These record which blocks
316 * are used, and how many references there are to each block
318 #define BTRFS_EXTENT_ITEM_KEY 8
321 * the inode map records which inode numbers are in use and where
322 * they actually live on disk
324 #define BTRFS_INODE_MAP_ITEM_KEY 9
326 * string items are for debugging. They just store a short string of
329 #define BTRFS_STRING_ITEM_KEY 10
331 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
333 return le64_to_cpu(i->generation);
336 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
339 i->generation = cpu_to_le64(val);
342 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
344 return le64_to_cpu(i->size);
347 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
349 i->size = cpu_to_le64(val);
352 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
354 return le64_to_cpu(i->nblocks);
357 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
359 i->nblocks = cpu_to_le64(val);
362 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
364 return le32_to_cpu(i->nlink);
367 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
369 i->nlink = cpu_to_le32(val);
372 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
374 return le32_to_cpu(i->uid);
377 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
379 i->uid = cpu_to_le32(val);
382 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
384 return le32_to_cpu(i->gid);
387 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
389 i->gid = cpu_to_le32(val);
392 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
394 return le32_to_cpu(i->mode);
397 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
399 i->mode = cpu_to_le32(val);
402 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
404 return le32_to_cpu(i->rdev);
407 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
409 i->rdev = cpu_to_le32(val);
412 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
414 return le16_to_cpu(i->flags);
417 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
419 i->flags = cpu_to_le16(val);
422 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
424 return le16_to_cpu(i->compat_flags);
427 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
430 i->compat_flags = cpu_to_le16(val);
433 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
435 return le64_to_cpu(ts->sec);
438 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
441 ts->sec = cpu_to_le64(val);
444 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
446 return le32_to_cpu(ts->nsec);
449 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
452 ts->nsec = cpu_to_le32(val);
455 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
457 return le64_to_cpu(ei->owner);
460 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
462 ei->owner = cpu_to_le64(val);
465 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
467 return le32_to_cpu(ei->refs);
470 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
472 ei->refs = cpu_to_le32(val);
475 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
477 return le64_to_cpu(n->ptrs[nr].blockptr);
480 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
483 n->ptrs[nr].blockptr = cpu_to_le64(val);
486 static inline u32 btrfs_item_offset(struct btrfs_item *item)
488 return le32_to_cpu(item->offset);
491 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
493 item->offset = cpu_to_le32(val);
496 static inline u32 btrfs_item_end(struct btrfs_item *item)
498 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
501 static inline u16 btrfs_item_size(struct btrfs_item *item)
503 return le16_to_cpu(item->size);
506 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
508 item->size = cpu_to_le16(val);
511 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
513 return le16_to_cpu(d->flags);
516 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
518 d->flags = cpu_to_le16(val);
521 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
526 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
531 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
533 return le16_to_cpu(d->name_len);
536 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
538 d->name_len = cpu_to_le16(val);
541 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
542 struct btrfs_disk_key *disk)
544 cpu->offset = le64_to_cpu(disk->offset);
545 cpu->flags = le32_to_cpu(disk->flags);
546 cpu->objectid = le64_to_cpu(disk->objectid);
549 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
550 struct btrfs_key *cpu)
552 disk->offset = cpu_to_le64(cpu->offset);
553 disk->flags = cpu_to_le32(cpu->flags);
554 disk->objectid = cpu_to_le64(cpu->objectid);
557 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
559 return le64_to_cpu(disk->objectid);
562 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
565 disk->objectid = cpu_to_le64(val);
568 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
570 return le64_to_cpu(disk->offset);
573 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
576 disk->offset = cpu_to_le64(val);
579 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
581 return le32_to_cpu(disk->flags);
584 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
587 disk->flags = cpu_to_le32(val);
590 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
592 u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
593 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
596 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
598 BUG_ON(over > BTRFS_KEY_OVERFLOW_MAX);
599 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
600 key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
603 static inline u32 btrfs_key_type(struct btrfs_key *key)
605 return key->flags & BTRFS_KEY_TYPE_MASK;
608 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
610 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
613 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
615 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
616 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
619 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
621 u32 flags = btrfs_disk_key_flags(key);
622 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
623 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
624 btrfs_set_disk_key_flags(key, flags);
627 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
629 u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
630 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
633 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
636 u32 flags = btrfs_disk_key_flags(key);
637 BUG_ON(over > BTRFS_KEY_OVERFLOW_MAX);
638 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
639 flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
640 btrfs_set_disk_key_flags(key, flags);
643 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
645 return le64_to_cpu(h->blocknr);
648 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
650 h->blocknr = cpu_to_le64(blocknr);
653 static inline u64 btrfs_header_generation(struct btrfs_header *h)
655 return le64_to_cpu(h->generation);
658 static inline void btrfs_set_header_generation(struct btrfs_header *h,
661 h->generation = cpu_to_le64(val);
664 static inline u64 btrfs_header_parentid(struct btrfs_header *h)
666 return le64_to_cpu(h->parentid);
669 static inline void btrfs_set_header_parentid(struct btrfs_header *h,
672 h->parentid = cpu_to_le64(parentid);
675 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
677 return le16_to_cpu(h->nritems);
680 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
682 h->nritems = cpu_to_le16(val);
685 static inline u16 btrfs_header_flags(struct btrfs_header *h)
687 return le16_to_cpu(h->flags);
690 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
692 h->flags = cpu_to_le16(val);
695 static inline int btrfs_header_level(struct btrfs_header *h)
700 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
702 BUG_ON(level > BTRFS_MAX_LEVEL);
706 static inline int btrfs_is_leaf(struct btrfs_node *n)
708 return (btrfs_header_level(&n->header) == 0);
711 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
713 return le64_to_cpu(item->blocknr);
716 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
718 item->blocknr = cpu_to_le64(val);
721 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
723 return le64_to_cpu(item->root_dirid);
726 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
728 item->root_dirid = cpu_to_le64(val);
731 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
733 return le32_to_cpu(item->refs);
736 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
738 item->refs = cpu_to_le32(val);
741 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
743 return le64_to_cpu(s->blocknr);
746 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
748 s->blocknr = cpu_to_le64(val);
751 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
753 return le64_to_cpu(s->root);
756 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
758 s->root = cpu_to_le64(val);
761 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
763 return le64_to_cpu(s->total_blocks);
766 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
769 s->total_blocks = cpu_to_le64(val);
772 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
774 return le64_to_cpu(s->blocks_used);
777 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
780 s->blocks_used = cpu_to_le64(val);
783 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
785 return le32_to_cpu(s->blocksize);
788 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
791 s->blocksize = cpu_to_le32(val);
794 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
796 return le64_to_cpu(s->root_dir_objectid);
799 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
802 s->root_dir_objectid = cpu_to_le64(val);
805 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
807 return (u8 *)l->items;
810 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
813 return le64_to_cpu(e->disk_blocknr);
816 static inline void btrfs_set_file_extent_disk_blocknr(struct
817 btrfs_file_extent_item
820 e->disk_blocknr = cpu_to_le64(val);
823 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
825 return le64_to_cpu(e->generation);
828 static inline void btrfs_set_file_extent_generation(struct
829 btrfs_file_extent_item *e,
832 e->generation = cpu_to_le64(val);
835 static inline u64 btrfs_file_extent_disk_num_blocks(struct
836 btrfs_file_extent_item *e)
838 return le64_to_cpu(e->disk_num_blocks);
841 static inline void btrfs_set_file_extent_disk_num_blocks(struct
842 btrfs_file_extent_item
845 e->disk_num_blocks = cpu_to_le64(val);
848 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
850 return le64_to_cpu(e->offset);
853 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
856 e->offset = cpu_to_le64(val);
859 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
862 return le64_to_cpu(e->num_blocks);
865 static inline void btrfs_set_file_extent_num_blocks(struct
866 btrfs_file_extent_item *e,
869 e->num_blocks = cpu_to_le64(val);
872 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
874 return sb->s_fs_info;
877 static inline void btrfs_check_bounds(void *vptr, size_t len,
878 void *vcontainer, size_t container_len)
881 char *container = vcontainer;
882 WARN_ON(ptr < container);
883 WARN_ON(ptr + len > container + container_len);
886 static inline void btrfs_memcpy(struct btrfs_root *root,
888 void *dst, const void *src, size_t nr)
890 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
891 memcpy(dst, src, nr);
894 static inline void btrfs_memmove(struct btrfs_root *root,
896 void *dst, void *src, size_t nr)
898 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
899 memmove(dst, src, nr);
902 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
904 WARN_ON(!atomic_read(&bh->b_count));
905 mark_buffer_dirty(bh);
908 /* helper function to cast into the data area of the leaf. */
909 #define btrfs_item_ptr(leaf, slot, type) \
910 ((type *)(btrfs_leaf_data(leaf) + \
911 btrfs_item_offset((leaf)->items + (slot))))
914 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
915 struct btrfs_root *root);
916 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
917 *root, u64 num_blocks, u64 search_start, u64
918 search_end, u64 owner, struct btrfs_key *ins);
919 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
920 struct buffer_head *buf);
921 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
922 *root, u64 blocknr, u64 num_blocks, int pin);
923 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
926 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
927 *root, struct btrfs_key *key, struct btrfs_path *p, int
929 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
930 struct btrfs_path *btrfs_alloc_path(void);
931 void btrfs_free_path(struct btrfs_path *p);
932 void btrfs_init_path(struct btrfs_path *p);
933 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
934 struct btrfs_path *path);
935 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
936 *root, struct btrfs_key *key, void *data, u32 data_size);
937 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
938 *root, struct btrfs_path *path, struct btrfs_key
939 *cpu_key, u32 data_size);
940 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
941 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
942 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
943 *root, struct buffer_head *snap);
945 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
946 struct btrfs_key *key);
947 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
948 *root, struct btrfs_key *key, struct btrfs_root_item
950 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
951 *root, struct btrfs_key *key, struct btrfs_root_item
953 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
954 btrfs_root_item *item, struct btrfs_key *key);
956 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
957 *root, const char *name, int name_len, u64 dir,
958 struct btrfs_key *location, u8 type);
959 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
960 *root, struct btrfs_path *path, u64 dir,
961 const char *name, int name_len, int mod);
962 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
963 struct btrfs_root *root,
964 struct btrfs_path *path, u64 dir,
965 u64 objectid, int mod);
966 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
967 const char *name, int name_len);
969 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
970 struct btrfs_root *fs_root,
971 u64 dirid, u64 *objectid);
972 int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
973 struct btrfs_root *root,
974 u64 objectid, struct btrfs_key *location);
975 int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
976 struct btrfs_root *root, struct btrfs_path *path,
977 u64 objectid, int mod);
978 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
981 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
982 *root, u64 objectid, struct btrfs_inode_item
984 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
985 *root, struct btrfs_path *path,
986 struct btrfs_key *location, int mod);
989 int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
990 struct btrfs_root *root,
991 u64 objectid, u64 offset,
992 u64 num_blocks, u64 hint_block,
994 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
995 struct btrfs_root *root,
996 struct btrfs_path *path, u64 objectid,
997 u64 blocknr, int mod);
998 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
999 struct btrfs_root *root,
1000 u64 objectid, u64 offset,
1001 char *data, size_t len);
1002 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1003 u64 objectid, u64 offset,
1004 char *data, size_t len);
1006 extern struct subsystem btrfs_subsys;