5 #include <linux/buffer_head.h>
6 #include <linux/kobject.h>
9 struct btrfs_trans_handle;
10 struct btrfs_transaction;
11 extern struct kmem_cache *btrfs_path_cachep;
13 #define BTRFS_MAGIC "_BtRfS_M"
15 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
16 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
17 #define BTRFS_FS_TREE_OBJECTID 3ULL
18 #define BTRFS_FIRST_FREE_OBJECTID 4ULL
21 * we can actually store much bigger names, but lets not confuse the rest
24 #define BTRFS_NAME_LEN 255
26 /* 32 bytes in various csum fields */
27 #define BTRFS_CSUM_SIZE 32
30 * the key defines the order in the tree, and so it also defines (optimal)
31 * block layout. objectid corresonds to the inode number. The flags
32 * tells us things about the object, and is a kind of stream selector.
33 * so for a given inode, keys with flags of 1 might refer to the inode
34 * data, flags of 2 may point to file data in the btree and flags == 3
35 * may point to extents.
37 * offset is the starting byte offset for this key in the stream.
39 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
40 * in cpu native order. Otherwise they are identical and their sizes
41 * should be the same (ie both packed)
43 struct btrfs_disk_key {
47 } __attribute__ ((__packed__));
53 } __attribute__ ((__packed__));
56 * every tree block (leaf or node) starts with this header.
59 u8 csum[BTRFS_CSUM_SIZE];
60 u8 fsid[16]; /* FS specific uuid */
61 __le64 blocknr; /* which block this node is supposed to live in */
63 __le64 parentid; /* objectid of the tree root */
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 {
151 } __attribute__ ((__packed__));
153 struct btrfs_inode_timespec {
156 } __attribute__ ((__packed__));
159 * there is no padding here on purpose. If you want to extent the inode,
160 * make a new item type
162 struct btrfs_inode_item {
173 struct btrfs_inode_timespec atime;
174 struct btrfs_inode_timespec ctime;
175 struct btrfs_inode_timespec mtime;
176 struct btrfs_inode_timespec otime;
177 } __attribute__ ((__packed__));
179 /* inline data is just a blob of bytes */
180 struct btrfs_inline_data_item {
182 } __attribute__ ((__packed__));
184 struct btrfs_dir_item {
185 struct btrfs_disk_key location;
189 } __attribute__ ((__packed__));
191 struct btrfs_root_item {
192 struct btrfs_inode_item inode;
199 } __attribute__ ((__packed__));
201 struct btrfs_file_extent_item {
204 * disk space consumed by the extent, checksum blocks are included
208 __le64 disk_num_blocks;
210 * the logical offset in file blocks (no csums)
211 * this extent record is for. This allows a file extent to point
212 * into the middle of an existing extent on disk, sharing it
213 * between two snapshots (useful if some bytes in the middle of the
214 * extent have changed
218 * the logical number of file blocks (no csums included)
221 } __attribute__ ((__packed__));
223 struct btrfs_csum_item {
224 u8 csum[BTRFS_CSUM_SIZE];
225 } __attribute__ ((__packed__));
228 struct btrfs_fs_info {
229 struct btrfs_root *extent_root;
230 struct btrfs_root *tree_root;
231 struct btrfs_key current_insert;
232 struct btrfs_key last_insert;
233 struct radix_tree_root fs_roots_radix;
234 struct radix_tree_root pending_del_radix;
235 struct radix_tree_root pinned_radix;
237 struct btrfs_transaction *running_transaction;
238 struct btrfs_super_block *disk_super;
239 struct buffer_head *sb_buffer;
240 struct super_block *sb;
241 struct inode *btree_inode;
242 struct mutex trans_mutex;
243 struct mutex fs_mutex;
244 struct crypto_hash *hash_tfm;
245 spinlock_t hash_lock;
250 * in ram representation of the tree. extent_root is used for all allocations
251 * and for the extent tree extent_root root. current_insert is used
252 * only for the extent tree.
255 struct buffer_head *node;
256 struct buffer_head *commit_root;
257 struct btrfs_root_item root_item;
258 struct btrfs_key root_key;
259 struct btrfs_fs_info *fs_info;
267 u64 last_inode_alloc;
270 /* the lower bits in the key flags defines the item type */
271 #define BTRFS_KEY_TYPE_MAX 256
272 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
274 #define BTRFS_KEY_OVERFLOW_MAX 128
275 #define BTRFS_KEY_OVERFLOW_SHIFT 8
276 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
279 * inode items have the data typically returned from stat and store other
280 * info about object characteristics. There is one for every file and dir in
283 #define BTRFS_INODE_ITEM_KEY 1
286 * dir items are the name -> inode pointers in a directory. There is one
287 * for every name in a directory.
289 #define BTRFS_DIR_ITEM_KEY 2
290 #define BTRFS_DIR_INDEX_KEY 3
292 * inline data is file data that fits in the btree.
294 #define BTRFS_INLINE_DATA_KEY 4
296 * extent data is for data that can't fit in the btree. It points to
297 * a (hopefully) huge chunk of disk
299 #define BTRFS_EXTENT_DATA_KEY 5
301 * csum items have the checksums for data in the extents
303 #define BTRFS_CSUM_ITEM_KEY 6
306 * root items point to tree roots. There are typically in the root
307 * tree used by the super block to find all the other trees
309 #define BTRFS_ROOT_ITEM_KEY 7
311 * extent items are in the extent map tree. These record which blocks
312 * are used, and how many references there are to each block
314 #define BTRFS_EXTENT_ITEM_KEY 8
317 * string items are for debugging. They just store a short string of
320 #define BTRFS_STRING_ITEM_KEY 9
322 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
324 return le64_to_cpu(i->generation);
327 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
330 i->generation = cpu_to_le64(val);
333 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
335 return le64_to_cpu(i->size);
338 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
340 i->size = cpu_to_le64(val);
343 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
345 return le64_to_cpu(i->nblocks);
348 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
350 i->nblocks = cpu_to_le64(val);
353 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
355 return le32_to_cpu(i->nlink);
358 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
360 i->nlink = cpu_to_le32(val);
363 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
365 return le32_to_cpu(i->uid);
368 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
370 i->uid = cpu_to_le32(val);
373 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
375 return le32_to_cpu(i->gid);
378 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
380 i->gid = cpu_to_le32(val);
383 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
385 return le32_to_cpu(i->mode);
388 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
390 i->mode = cpu_to_le32(val);
393 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
395 return le32_to_cpu(i->rdev);
398 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
400 i->rdev = cpu_to_le32(val);
403 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
405 return le16_to_cpu(i->flags);
408 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
410 i->flags = cpu_to_le16(val);
413 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
415 return le16_to_cpu(i->compat_flags);
418 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
421 i->compat_flags = cpu_to_le16(val);
424 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
426 return le64_to_cpu(ts->sec);
429 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
432 ts->sec = cpu_to_le64(val);
435 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
437 return le32_to_cpu(ts->nsec);
440 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
443 ts->nsec = cpu_to_le32(val);
446 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
448 return le64_to_cpu(ei->owner);
451 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
453 ei->owner = cpu_to_le64(val);
456 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
458 return le32_to_cpu(ei->refs);
461 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
463 ei->refs = cpu_to_le32(val);
466 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
468 return le64_to_cpu(n->ptrs[nr].blockptr);
471 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
474 n->ptrs[nr].blockptr = cpu_to_le64(val);
477 static inline u32 btrfs_item_offset(struct btrfs_item *item)
479 return le32_to_cpu(item->offset);
482 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
484 item->offset = cpu_to_le32(val);
487 static inline u32 btrfs_item_end(struct btrfs_item *item)
489 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
492 static inline u16 btrfs_item_size(struct btrfs_item *item)
494 return le16_to_cpu(item->size);
497 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
499 item->size = cpu_to_le16(val);
502 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
504 return le16_to_cpu(d->flags);
507 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
509 d->flags = cpu_to_le16(val);
512 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
517 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
522 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
524 return le16_to_cpu(d->name_len);
527 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
529 d->name_len = cpu_to_le16(val);
532 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
533 struct btrfs_disk_key *disk)
535 cpu->offset = le64_to_cpu(disk->offset);
536 cpu->flags = le32_to_cpu(disk->flags);
537 cpu->objectid = le64_to_cpu(disk->objectid);
540 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
541 struct btrfs_key *cpu)
543 disk->offset = cpu_to_le64(cpu->offset);
544 disk->flags = cpu_to_le32(cpu->flags);
545 disk->objectid = cpu_to_le64(cpu->objectid);
548 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
550 return le64_to_cpu(disk->objectid);
553 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
556 disk->objectid = cpu_to_le64(val);
559 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
561 return le64_to_cpu(disk->offset);
564 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
567 disk->offset = cpu_to_le64(val);
570 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
572 return le32_to_cpu(disk->flags);
575 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
578 disk->flags = cpu_to_le32(val);
581 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
583 u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
584 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
587 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
589 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
590 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
591 key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
594 static inline u32 btrfs_key_type(struct btrfs_key *key)
596 return key->flags & BTRFS_KEY_TYPE_MASK;
599 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
601 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
604 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
606 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
607 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
610 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
612 u32 flags = btrfs_disk_key_flags(key);
613 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
614 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
615 btrfs_set_disk_key_flags(key, flags);
618 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
620 u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
621 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
624 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
627 u32 flags = btrfs_disk_key_flags(key);
628 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
629 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
630 flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
631 btrfs_set_disk_key_flags(key, flags);
634 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
636 return le64_to_cpu(h->blocknr);
639 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
641 h->blocknr = cpu_to_le64(blocknr);
644 static inline u64 btrfs_header_generation(struct btrfs_header *h)
646 return le64_to_cpu(h->generation);
649 static inline void btrfs_set_header_generation(struct btrfs_header *h,
652 h->generation = cpu_to_le64(val);
655 static inline u64 btrfs_header_parentid(struct btrfs_header *h)
657 return le64_to_cpu(h->parentid);
660 static inline void btrfs_set_header_parentid(struct btrfs_header *h,
663 h->parentid = cpu_to_le64(parentid);
666 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
668 return le16_to_cpu(h->nritems);
671 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
673 h->nritems = cpu_to_le16(val);
676 static inline u16 btrfs_header_flags(struct btrfs_header *h)
678 return le16_to_cpu(h->flags);
681 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
683 h->flags = cpu_to_le16(val);
686 static inline int btrfs_header_level(struct btrfs_header *h)
691 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
693 BUG_ON(level > BTRFS_MAX_LEVEL);
697 static inline int btrfs_is_leaf(struct btrfs_node *n)
699 return (btrfs_header_level(&n->header) == 0);
702 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
704 return le64_to_cpu(item->blocknr);
707 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
709 item->blocknr = cpu_to_le64(val);
712 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
714 return le64_to_cpu(item->root_dirid);
717 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
719 item->root_dirid = cpu_to_le64(val);
722 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
724 return le32_to_cpu(item->refs);
727 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
729 item->refs = cpu_to_le32(val);
732 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
734 return le64_to_cpu(s->blocknr);
737 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
739 s->blocknr = cpu_to_le64(val);
742 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
744 return le64_to_cpu(s->generation);
747 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
750 s->generation = cpu_to_le64(val);
753 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
755 return le64_to_cpu(s->root);
758 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
760 s->root = cpu_to_le64(val);
763 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
765 return le64_to_cpu(s->total_blocks);
768 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
771 s->total_blocks = cpu_to_le64(val);
774 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
776 return le64_to_cpu(s->blocks_used);
779 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
782 s->blocks_used = cpu_to_le64(val);
785 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
787 return le32_to_cpu(s->blocksize);
790 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
793 s->blocksize = cpu_to_le32(val);
796 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
798 return le64_to_cpu(s->root_dir_objectid);
801 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
804 s->root_dir_objectid = cpu_to_le64(val);
807 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
809 return (u8 *)l->items;
812 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
815 return le64_to_cpu(e->disk_blocknr);
818 static inline void btrfs_set_file_extent_disk_blocknr(struct
819 btrfs_file_extent_item
822 e->disk_blocknr = cpu_to_le64(val);
825 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
827 return le64_to_cpu(e->generation);
830 static inline void btrfs_set_file_extent_generation(struct
831 btrfs_file_extent_item *e,
834 e->generation = cpu_to_le64(val);
837 static inline u64 btrfs_file_extent_disk_num_blocks(struct
838 btrfs_file_extent_item *e)
840 return le64_to_cpu(e->disk_num_blocks);
843 static inline void btrfs_set_file_extent_disk_num_blocks(struct
844 btrfs_file_extent_item
847 e->disk_num_blocks = cpu_to_le64(val);
850 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
852 return le64_to_cpu(e->offset);
855 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
858 e->offset = cpu_to_le64(val);
861 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
864 return le64_to_cpu(e->num_blocks);
867 static inline void btrfs_set_file_extent_num_blocks(struct
868 btrfs_file_extent_item *e,
871 e->num_blocks = cpu_to_le64(val);
874 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
876 return sb->s_fs_info;
879 static inline void btrfs_check_bounds(void *vptr, size_t len,
880 void *vcontainer, size_t container_len)
883 char *container = vcontainer;
884 WARN_ON(ptr < container);
885 WARN_ON(ptr + len > container + container_len);
888 static inline void btrfs_memcpy(struct btrfs_root *root,
890 void *dst, const void *src, size_t nr)
892 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
893 memcpy(dst, src, nr);
896 static inline void btrfs_memmove(struct btrfs_root *root,
898 void *dst, void *src, size_t nr)
900 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
901 memmove(dst, src, nr);
904 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
906 WARN_ON(!atomic_read(&bh->b_count));
907 mark_buffer_dirty(bh);
910 /* helper function to cast into the data area of the leaf. */
911 #define btrfs_item_ptr(leaf, slot, type) \
912 ((type *)(btrfs_leaf_data(leaf) + \
913 btrfs_item_offset((leaf)->items + (slot))))
916 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
917 struct btrfs_root *root);
918 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
919 struct btrfs_root *root);
920 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
921 *root, u64 num_blocks, u64 search_start, u64
922 search_end, u64 owner, struct btrfs_key *ins);
923 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
924 struct buffer_head *buf);
925 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
926 *root, u64 blocknr, u64 num_blocks, int pin);
927 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
930 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
931 *root, struct btrfs_key *key, struct btrfs_path *p, int
933 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
934 struct btrfs_path *btrfs_alloc_path(void);
935 void btrfs_free_path(struct btrfs_path *p);
936 void btrfs_init_path(struct btrfs_path *p);
937 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
938 struct btrfs_path *path);
939 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
940 *root, struct btrfs_key *key, void *data, u32 data_size);
941 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
942 *root, struct btrfs_path *path, struct btrfs_key
943 *cpu_key, u32 data_size);
944 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
945 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
946 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
947 *root, struct buffer_head *snap);
949 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
950 struct btrfs_key *key);
951 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
952 *root, struct btrfs_key *key, struct btrfs_root_item
954 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
955 *root, struct btrfs_key *key, struct btrfs_root_item
957 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
958 btrfs_root_item *item, struct btrfs_key *key);
960 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
961 *root, const char *name, int name_len, u64 dir,
962 struct btrfs_key *location, u8 type);
963 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
964 *root, struct btrfs_path *path, u64 dir,
965 const char *name, int name_len, int mod);
966 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
967 struct btrfs_root *root,
968 struct btrfs_path *path, u64 dir,
969 u64 objectid, int mod);
970 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
971 const char *name, int name_len);
973 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
974 struct btrfs_root *fs_root,
975 u64 dirid, u64 *objectid);
976 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
979 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
980 *root, u64 objectid, struct btrfs_inode_item
982 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
983 *root, struct btrfs_path *path,
984 struct btrfs_key *location, int mod);
987 int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
988 struct btrfs_root *root,
989 u64 objectid, u64 offset,
990 u64 num_blocks, u64 hint_block,
992 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
993 struct btrfs_root *root,
994 struct btrfs_path *path, u64 objectid,
995 u64 blocknr, int mod);
996 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
997 struct btrfs_root *root,
998 u64 objectid, u64 offset,
999 char *data, size_t len);
1000 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1001 u64 objectid, u64 offset,
1002 char *data, size_t len);
1004 extern struct subsystem btrfs_subsys;