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_ROOT_TREE_DIR_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 */
67 } __attribute__ ((__packed__));
69 #define BTRFS_MAX_LEVEL 8
70 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
71 sizeof(struct btrfs_header)) / \
72 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
73 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
74 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
78 * the super block basically lists the main trees of the FS
79 * it currently lacks any block count etc etc
81 struct btrfs_super_block {
82 u8 csum[BTRFS_CSUM_SIZE];
83 /* the first 3 fields must match struct btrfs_header */
84 u8 fsid[16]; /* FS specific uuid */
85 __le64 blocknr; /* this block number */
92 __le64 root_dir_objectid;
93 } __attribute__ ((__packed__));
96 * A leaf is full of items. offset and size tell us where to find
97 * the item in the leaf (relative to the start of the data area)
100 struct btrfs_disk_key key;
103 } __attribute__ ((__packed__));
106 * leaves have an item area and a data area:
107 * [item0, item1....itemN] [free space] [dataN...data1, data0]
109 * The data is separate from the items to get the keys closer together
113 struct btrfs_header header;
114 struct btrfs_item items[];
115 } __attribute__ ((__packed__));
118 * all non-leaf blocks are nodes, they hold only keys and pointers to
121 struct btrfs_key_ptr {
122 struct btrfs_disk_key key;
124 } __attribute__ ((__packed__));
127 struct btrfs_header header;
128 struct btrfs_key_ptr ptrs[];
129 } __attribute__ ((__packed__));
132 * btrfs_paths remember the path taken from the root down to the leaf.
133 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
134 * to any other levels that are present.
136 * The slots array records the index of the item or block pointer
137 * used while walking the tree.
140 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
141 int slots[BTRFS_MAX_LEVEL];
145 * items in the extent btree are used to record the objectid of the
146 * owner of the block and the number of references
148 struct btrfs_extent_item {
150 } __attribute__ ((__packed__));
152 struct btrfs_inode_timespec {
155 } __attribute__ ((__packed__));
158 * there is no padding here on purpose. If you want to extent the inode,
159 * make a new item type
161 struct btrfs_inode_item {
172 struct btrfs_inode_timespec atime;
173 struct btrfs_inode_timespec ctime;
174 struct btrfs_inode_timespec mtime;
175 struct btrfs_inode_timespec otime;
176 } __attribute__ ((__packed__));
178 /* inline data is just a blob of bytes */
179 struct btrfs_inline_data_item {
181 } __attribute__ ((__packed__));
183 struct btrfs_dir_item {
184 struct btrfs_disk_key location;
188 } __attribute__ ((__packed__));
190 struct btrfs_root_item {
191 struct btrfs_inode_item inode;
198 } __attribute__ ((__packed__));
200 struct btrfs_file_extent_item {
203 * disk space consumed by the extent, checksum blocks are included
207 __le64 disk_num_blocks;
209 * the logical offset in file blocks (no csums)
210 * this extent record is for. This allows a file extent to point
211 * into the middle of an existing extent on disk, sharing it
212 * between two snapshots (useful if some bytes in the middle of the
213 * extent have changed
217 * the logical number of file blocks (no csums included)
220 } __attribute__ ((__packed__));
222 struct btrfs_csum_item {
223 u8 csum[BTRFS_CSUM_SIZE];
224 } __attribute__ ((__packed__));
227 struct btrfs_fs_info {
228 struct btrfs_root *extent_root;
229 struct btrfs_root *tree_root;
230 struct btrfs_key current_insert;
231 struct btrfs_key last_insert;
232 struct radix_tree_root fs_roots_radix;
233 struct radix_tree_root pending_del_radix;
234 struct radix_tree_root pinned_radix;
236 struct btrfs_transaction *running_transaction;
237 struct btrfs_super_block *disk_super;
238 struct buffer_head *sb_buffer;
239 struct super_block *sb;
240 struct inode *btree_inode;
241 struct mutex trans_mutex;
242 struct mutex fs_mutex;
243 struct crypto_hash *hash_tfm;
244 spinlock_t hash_lock;
249 * in ram representation of the tree. extent_root is used for all allocations
250 * and for the extent tree extent_root root. current_insert is used
251 * only for the extent tree.
254 struct buffer_head *node;
255 struct buffer_head *commit_root;
256 struct btrfs_root_item root_item;
257 struct btrfs_key root_key;
258 struct btrfs_fs_info *fs_info;
266 u64 last_inode_alloc;
269 /* the lower bits in the key flags defines the item type */
270 #define BTRFS_KEY_TYPE_MAX 256
271 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
273 #define BTRFS_KEY_OVERFLOW_MAX 128
274 #define BTRFS_KEY_OVERFLOW_SHIFT 8
275 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
278 * inode items have the data typically returned from stat and store other
279 * info about object characteristics. There is one for every file and dir in
282 #define BTRFS_INODE_ITEM_KEY 1
285 * dir items are the name -> inode pointers in a directory. There is one
286 * for every name in a directory.
288 #define BTRFS_DIR_ITEM_KEY 2
289 #define BTRFS_DIR_INDEX_KEY 3
291 * inline data is file data that fits in the btree.
293 #define BTRFS_INLINE_DATA_KEY 4
295 * extent data is for data that can't fit in the btree. It points to
296 * a (hopefully) huge chunk of disk
298 #define BTRFS_EXTENT_DATA_KEY 5
300 * csum items have the checksums for data in the extents
302 #define BTRFS_CSUM_ITEM_KEY 6
305 * root items point to tree roots. There are typically in the root
306 * tree used by the super block to find all the other trees
308 #define BTRFS_ROOT_ITEM_KEY 7
310 * extent items are in the extent map tree. These record which blocks
311 * are used, and how many references there are to each block
313 #define BTRFS_EXTENT_ITEM_KEY 8
316 * string items are for debugging. They just store a short string of
319 #define BTRFS_STRING_ITEM_KEY 9
321 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
323 return le64_to_cpu(i->generation);
326 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
329 i->generation = cpu_to_le64(val);
332 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
334 return le64_to_cpu(i->size);
337 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
339 i->size = cpu_to_le64(val);
342 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
344 return le64_to_cpu(i->nblocks);
347 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
349 i->nblocks = cpu_to_le64(val);
352 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
354 return le32_to_cpu(i->nlink);
357 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
359 i->nlink = cpu_to_le32(val);
362 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
364 return le32_to_cpu(i->uid);
367 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
369 i->uid = cpu_to_le32(val);
372 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
374 return le32_to_cpu(i->gid);
377 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
379 i->gid = cpu_to_le32(val);
382 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
384 return le32_to_cpu(i->mode);
387 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
389 i->mode = cpu_to_le32(val);
392 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
394 return le32_to_cpu(i->rdev);
397 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
399 i->rdev = cpu_to_le32(val);
402 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
404 return le16_to_cpu(i->flags);
407 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
409 i->flags = cpu_to_le16(val);
412 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
414 return le16_to_cpu(i->compat_flags);
417 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
420 i->compat_flags = cpu_to_le16(val);
423 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
425 return le64_to_cpu(ts->sec);
428 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
431 ts->sec = cpu_to_le64(val);
434 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
436 return le32_to_cpu(ts->nsec);
439 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
442 ts->nsec = cpu_to_le32(val);
445 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
447 return le32_to_cpu(ei->refs);
450 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
452 ei->refs = cpu_to_le32(val);
455 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
457 return le64_to_cpu(n->ptrs[nr].blockptr);
460 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
463 n->ptrs[nr].blockptr = cpu_to_le64(val);
466 static inline u32 btrfs_item_offset(struct btrfs_item *item)
468 return le32_to_cpu(item->offset);
471 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
473 item->offset = cpu_to_le32(val);
476 static inline u32 btrfs_item_end(struct btrfs_item *item)
478 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
481 static inline u16 btrfs_item_size(struct btrfs_item *item)
483 return le16_to_cpu(item->size);
486 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
488 item->size = cpu_to_le16(val);
491 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
493 return le16_to_cpu(d->flags);
496 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
498 d->flags = cpu_to_le16(val);
501 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
506 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
511 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
513 return le16_to_cpu(d->name_len);
516 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
518 d->name_len = cpu_to_le16(val);
521 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
522 struct btrfs_disk_key *disk)
524 cpu->offset = le64_to_cpu(disk->offset);
525 cpu->flags = le32_to_cpu(disk->flags);
526 cpu->objectid = le64_to_cpu(disk->objectid);
529 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
530 struct btrfs_key *cpu)
532 disk->offset = cpu_to_le64(cpu->offset);
533 disk->flags = cpu_to_le32(cpu->flags);
534 disk->objectid = cpu_to_le64(cpu->objectid);
537 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
539 return le64_to_cpu(disk->objectid);
542 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
545 disk->objectid = cpu_to_le64(val);
548 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
550 return le64_to_cpu(disk->offset);
553 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
556 disk->offset = cpu_to_le64(val);
559 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
561 return le32_to_cpu(disk->flags);
564 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
567 disk->flags = cpu_to_le32(val);
570 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
572 u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
573 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
576 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
578 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
579 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
580 key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
583 static inline u32 btrfs_key_type(struct btrfs_key *key)
585 return key->flags & BTRFS_KEY_TYPE_MASK;
588 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
590 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
593 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
595 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
596 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
599 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
601 u32 flags = btrfs_disk_key_flags(key);
602 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
603 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
604 btrfs_set_disk_key_flags(key, flags);
607 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
609 u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
610 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
613 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
616 u32 flags = btrfs_disk_key_flags(key);
617 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
618 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
619 flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
620 btrfs_set_disk_key_flags(key, flags);
623 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
625 return le64_to_cpu(h->blocknr);
628 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
630 h->blocknr = cpu_to_le64(blocknr);
633 static inline u64 btrfs_header_generation(struct btrfs_header *h)
635 return le64_to_cpu(h->generation);
638 static inline void btrfs_set_header_generation(struct btrfs_header *h,
641 h->generation = cpu_to_le64(val);
644 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
646 return le16_to_cpu(h->nritems);
649 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
651 h->nritems = cpu_to_le16(val);
654 static inline u16 btrfs_header_flags(struct btrfs_header *h)
656 return le16_to_cpu(h->flags);
659 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
661 h->flags = cpu_to_le16(val);
664 static inline int btrfs_header_level(struct btrfs_header *h)
669 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
671 BUG_ON(level > BTRFS_MAX_LEVEL);
675 static inline int btrfs_is_leaf(struct btrfs_node *n)
677 return (btrfs_header_level(&n->header) == 0);
680 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
682 return le64_to_cpu(item->blocknr);
685 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
687 item->blocknr = cpu_to_le64(val);
690 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
692 return le64_to_cpu(item->root_dirid);
695 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
697 item->root_dirid = cpu_to_le64(val);
700 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
702 return le32_to_cpu(item->refs);
705 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
707 item->refs = cpu_to_le32(val);
710 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
712 return le64_to_cpu(s->blocknr);
715 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
717 s->blocknr = cpu_to_le64(val);
720 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
722 return le64_to_cpu(s->generation);
725 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
728 s->generation = cpu_to_le64(val);
731 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
733 return le64_to_cpu(s->root);
736 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
738 s->root = cpu_to_le64(val);
741 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
743 return le64_to_cpu(s->total_blocks);
746 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
749 s->total_blocks = cpu_to_le64(val);
752 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
754 return le64_to_cpu(s->blocks_used);
757 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
760 s->blocks_used = cpu_to_le64(val);
763 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
765 return le32_to_cpu(s->blocksize);
768 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
771 s->blocksize = cpu_to_le32(val);
774 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
776 return le64_to_cpu(s->root_dir_objectid);
779 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
782 s->root_dir_objectid = cpu_to_le64(val);
785 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
787 return (u8 *)l->items;
790 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
793 return le64_to_cpu(e->disk_blocknr);
796 static inline void btrfs_set_file_extent_disk_blocknr(struct
797 btrfs_file_extent_item
800 e->disk_blocknr = cpu_to_le64(val);
803 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
805 return le64_to_cpu(e->generation);
808 static inline void btrfs_set_file_extent_generation(struct
809 btrfs_file_extent_item *e,
812 e->generation = cpu_to_le64(val);
815 static inline u64 btrfs_file_extent_disk_num_blocks(struct
816 btrfs_file_extent_item *e)
818 return le64_to_cpu(e->disk_num_blocks);
821 static inline void btrfs_set_file_extent_disk_num_blocks(struct
822 btrfs_file_extent_item
825 e->disk_num_blocks = cpu_to_le64(val);
828 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
830 return le64_to_cpu(e->offset);
833 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
836 e->offset = cpu_to_le64(val);
839 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
842 return le64_to_cpu(e->num_blocks);
845 static inline void btrfs_set_file_extent_num_blocks(struct
846 btrfs_file_extent_item *e,
849 e->num_blocks = cpu_to_le64(val);
852 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
854 return sb->s_fs_info;
857 static inline void btrfs_check_bounds(void *vptr, size_t len,
858 void *vcontainer, size_t container_len)
861 char *container = vcontainer;
862 WARN_ON(ptr < container);
863 WARN_ON(ptr + len > container + container_len);
866 static inline void btrfs_memcpy(struct btrfs_root *root,
868 void *dst, const void *src, size_t nr)
870 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
871 memcpy(dst, src, nr);
874 static inline void btrfs_memmove(struct btrfs_root *root,
876 void *dst, void *src, size_t nr)
878 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
879 memmove(dst, src, nr);
882 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
884 WARN_ON(!atomic_read(&bh->b_count));
885 mark_buffer_dirty(bh);
888 /* helper function to cast into the data area of the leaf. */
889 #define btrfs_item_ptr(leaf, slot, type) \
890 ((type *)(btrfs_leaf_data(leaf) + \
891 btrfs_item_offset((leaf)->items + (slot))))
894 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
895 struct btrfs_root *root);
896 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
897 struct btrfs_root *root);
898 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
899 *root, u64 num_blocks, u64 search_start, u64
900 search_end, struct btrfs_key *ins);
901 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
902 struct buffer_head *buf);
903 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
904 *root, u64 blocknr, u64 num_blocks, int pin);
905 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
908 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
909 *root, struct btrfs_key *key, struct btrfs_path *p, int
911 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
912 struct btrfs_path *btrfs_alloc_path(void);
913 void btrfs_free_path(struct btrfs_path *p);
914 void btrfs_init_path(struct btrfs_path *p);
915 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
916 struct btrfs_path *path);
917 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
918 *root, struct btrfs_key *key, void *data, u32 data_size);
919 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
920 *root, struct btrfs_path *path, struct btrfs_key
921 *cpu_key, u32 data_size);
922 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
923 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
924 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
925 *root, struct buffer_head *snap);
927 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
928 struct btrfs_key *key);
929 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
930 *root, struct btrfs_key *key, struct btrfs_root_item
932 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
933 *root, struct btrfs_key *key, struct btrfs_root_item
935 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
936 btrfs_root_item *item, struct btrfs_key *key);
938 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
939 *root, const char *name, int name_len, u64 dir,
940 struct btrfs_key *location, u8 type);
941 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
942 *root, struct btrfs_path *path, u64 dir,
943 const char *name, int name_len, int mod);
944 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
945 struct btrfs_root *root,
946 struct btrfs_path *path, u64 dir,
947 u64 objectid, int mod);
948 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
949 const char *name, int name_len);
951 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
952 struct btrfs_root *fs_root,
953 u64 dirid, u64 *objectid);
954 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
957 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
958 *root, u64 objectid, struct btrfs_inode_item
960 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
961 *root, struct btrfs_path *path,
962 struct btrfs_key *location, int mod);
965 int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
966 struct btrfs_root *root,
967 u64 objectid, u64 offset,
968 u64 num_blocks, u64 hint_block,
970 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
971 struct btrfs_root *root,
972 struct btrfs_path *path, u64 objectid,
973 u64 blocknr, int mod);
974 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
975 struct btrfs_root *root,
976 u64 objectid, u64 offset,
977 char *data, size_t len);
978 int btrfs_csum_verify_file_block(struct btrfs_root *root,
979 u64 objectid, u64 offset,
980 char *data, size_t len);
982 extern struct subsystem btrfs_subsys;