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 {
231 } __attribute__ ((__packed__));
234 struct btrfs_fs_info {
235 struct btrfs_root *extent_root;
236 struct btrfs_root *tree_root;
237 struct btrfs_root *inode_root;
238 struct btrfs_key current_insert;
239 struct btrfs_key last_insert;
240 struct radix_tree_root fs_roots_radix;
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;
277 /* the lower bits in the key flags defines the item type */
278 #define BTRFS_KEY_TYPE_MAX 256
279 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
281 #define BTRFS_KEY_OVERFLOW_MAX 128
282 #define BTRFS_KEY_OVERFLOW_SHIFT 8
283 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
286 * inode items have the data typically returned from stat and store other
287 * info about object characteristics. There is one for every file and dir in
290 #define BTRFS_INODE_ITEM_KEY 1
293 * dir items are the name -> inode pointers in a directory. There is one
294 * for every name in a directory.
296 #define BTRFS_DIR_ITEM_KEY 2
297 #define BTRFS_DIR_INDEX_KEY 3
299 * inline data is file data that fits in the btree.
301 #define BTRFS_INLINE_DATA_KEY 4
303 * extent data is for data that can't fit in the btree. It points to
304 * a (hopefully) huge chunk of disk
306 #define BTRFS_EXTENT_DATA_KEY 5
308 * csum items have the checksums for data in the extents
310 #define BTRFS_CSUM_ITEM_KEY 6
313 * root items point to tree roots. There are typically in the root
314 * tree used by the super block to find all the other trees
316 #define BTRFS_ROOT_ITEM_KEY 7
318 * extent items are in the extent map tree. These record which blocks
319 * are used, and how many references there are to each block
321 #define BTRFS_EXTENT_ITEM_KEY 8
324 * the inode map records which inode numbers are in use and where
325 * they actually live on disk
327 #define BTRFS_INODE_MAP_ITEM_KEY 9
329 * string items are for debugging. They just store a short string of
332 #define BTRFS_STRING_ITEM_KEY 10
334 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
336 return le64_to_cpu(i->generation);
339 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
342 i->generation = cpu_to_le64(val);
345 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
347 return le64_to_cpu(i->size);
350 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
352 i->size = cpu_to_le64(val);
355 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
357 return le64_to_cpu(i->nblocks);
360 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
362 i->nblocks = cpu_to_le64(val);
365 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
367 return le32_to_cpu(i->nlink);
370 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
372 i->nlink = cpu_to_le32(val);
375 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
377 return le32_to_cpu(i->uid);
380 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
382 i->uid = cpu_to_le32(val);
385 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
387 return le32_to_cpu(i->gid);
390 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
392 i->gid = cpu_to_le32(val);
395 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
397 return le32_to_cpu(i->mode);
400 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
402 i->mode = cpu_to_le32(val);
405 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
407 return le32_to_cpu(i->rdev);
410 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
412 i->rdev = cpu_to_le32(val);
415 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
417 return le16_to_cpu(i->flags);
420 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
422 i->flags = cpu_to_le16(val);
425 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
427 return le16_to_cpu(i->compat_flags);
430 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
433 i->compat_flags = cpu_to_le16(val);
436 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
438 return le64_to_cpu(ts->sec);
441 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
444 ts->sec = cpu_to_le64(val);
447 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
449 return le32_to_cpu(ts->nsec);
452 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
455 ts->nsec = cpu_to_le32(val);
458 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
460 return le64_to_cpu(ei->owner);
463 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
465 ei->owner = cpu_to_le64(val);
468 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
470 return le32_to_cpu(ei->refs);
473 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
475 ei->refs = cpu_to_le32(val);
478 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
480 return le64_to_cpu(n->ptrs[nr].blockptr);
483 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
486 n->ptrs[nr].blockptr = cpu_to_le64(val);
489 static inline u32 btrfs_item_offset(struct btrfs_item *item)
491 return le32_to_cpu(item->offset);
494 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
496 item->offset = cpu_to_le32(val);
499 static inline u32 btrfs_item_end(struct btrfs_item *item)
501 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
504 static inline u16 btrfs_item_size(struct btrfs_item *item)
506 return le16_to_cpu(item->size);
509 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
511 item->size = cpu_to_le16(val);
514 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
516 return le16_to_cpu(d->flags);
519 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
521 d->flags = cpu_to_le16(val);
524 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
529 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
534 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
536 return le16_to_cpu(d->name_len);
539 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
541 d->name_len = cpu_to_le16(val);
544 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
545 struct btrfs_disk_key *disk)
547 cpu->offset = le64_to_cpu(disk->offset);
548 cpu->flags = le32_to_cpu(disk->flags);
549 cpu->objectid = le64_to_cpu(disk->objectid);
552 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
553 struct btrfs_key *cpu)
555 disk->offset = cpu_to_le64(cpu->offset);
556 disk->flags = cpu_to_le32(cpu->flags);
557 disk->objectid = cpu_to_le64(cpu->objectid);
560 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
562 return le64_to_cpu(disk->objectid);
565 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
568 disk->objectid = cpu_to_le64(val);
571 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
573 return le64_to_cpu(disk->offset);
576 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
579 disk->offset = cpu_to_le64(val);
582 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
584 return le32_to_cpu(disk->flags);
587 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
590 disk->flags = cpu_to_le32(val);
593 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
595 u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
596 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
599 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
601 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
602 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
603 key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
606 static inline u32 btrfs_key_type(struct btrfs_key *key)
608 return key->flags & BTRFS_KEY_TYPE_MASK;
611 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
613 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
616 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
618 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
619 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
622 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
624 u32 flags = btrfs_disk_key_flags(key);
625 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
626 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
627 btrfs_set_disk_key_flags(key, flags);
630 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
632 u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
633 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
636 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
639 u32 flags = btrfs_disk_key_flags(key);
640 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
641 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
642 flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
643 btrfs_set_disk_key_flags(key, flags);
646 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
648 return le64_to_cpu(h->blocknr);
651 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
653 h->blocknr = cpu_to_le64(blocknr);
656 static inline u64 btrfs_header_generation(struct btrfs_header *h)
658 return le64_to_cpu(h->generation);
661 static inline void btrfs_set_header_generation(struct btrfs_header *h,
664 h->generation = cpu_to_le64(val);
667 static inline u64 btrfs_header_parentid(struct btrfs_header *h)
669 return le64_to_cpu(h->parentid);
672 static inline void btrfs_set_header_parentid(struct btrfs_header *h,
675 h->parentid = cpu_to_le64(parentid);
678 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
680 return le16_to_cpu(h->nritems);
683 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
685 h->nritems = cpu_to_le16(val);
688 static inline u16 btrfs_header_flags(struct btrfs_header *h)
690 return le16_to_cpu(h->flags);
693 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
695 h->flags = cpu_to_le16(val);
698 static inline int btrfs_header_level(struct btrfs_header *h)
703 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
705 BUG_ON(level > BTRFS_MAX_LEVEL);
709 static inline int btrfs_is_leaf(struct btrfs_node *n)
711 return (btrfs_header_level(&n->header) == 0);
714 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
716 return le64_to_cpu(item->blocknr);
719 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
721 item->blocknr = cpu_to_le64(val);
724 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
726 return le64_to_cpu(item->root_dirid);
729 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
731 item->root_dirid = cpu_to_le64(val);
734 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
736 return le32_to_cpu(item->refs);
739 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
741 item->refs = cpu_to_le32(val);
744 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
746 return le64_to_cpu(s->blocknr);
749 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
751 s->blocknr = cpu_to_le64(val);
754 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
756 return le64_to_cpu(s->generation);
759 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
762 s->generation = cpu_to_le64(val);
765 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
767 return le64_to_cpu(s->root);
770 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
772 s->root = cpu_to_le64(val);
775 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
777 return le64_to_cpu(s->total_blocks);
780 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
783 s->total_blocks = cpu_to_le64(val);
786 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
788 return le64_to_cpu(s->blocks_used);
791 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
794 s->blocks_used = cpu_to_le64(val);
797 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
799 return le32_to_cpu(s->blocksize);
802 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
805 s->blocksize = cpu_to_le32(val);
808 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
810 return le64_to_cpu(s->root_dir_objectid);
813 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
816 s->root_dir_objectid = cpu_to_le64(val);
819 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
821 return (u8 *)l->items;
824 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
827 return le64_to_cpu(e->disk_blocknr);
830 static inline void btrfs_set_file_extent_disk_blocknr(struct
831 btrfs_file_extent_item
834 e->disk_blocknr = cpu_to_le64(val);
837 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
839 return le64_to_cpu(e->generation);
842 static inline void btrfs_set_file_extent_generation(struct
843 btrfs_file_extent_item *e,
846 e->generation = cpu_to_le64(val);
849 static inline u64 btrfs_file_extent_disk_num_blocks(struct
850 btrfs_file_extent_item *e)
852 return le64_to_cpu(e->disk_num_blocks);
855 static inline void btrfs_set_file_extent_disk_num_blocks(struct
856 btrfs_file_extent_item
859 e->disk_num_blocks = cpu_to_le64(val);
862 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
864 return le64_to_cpu(e->offset);
867 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
870 e->offset = cpu_to_le64(val);
873 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
876 return le64_to_cpu(e->num_blocks);
879 static inline void btrfs_set_file_extent_num_blocks(struct
880 btrfs_file_extent_item *e,
883 e->num_blocks = cpu_to_le64(val);
886 static inline u32 btrfs_inode_map_refs(struct btrfs_inode_map_item *m)
888 return le32_to_cpu(m->refs);
891 static inline void btrfs_set_inode_map_refs(struct btrfs_inode_map_item *m,
894 m->refs = cpu_to_le32(val);
897 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
899 return sb->s_fs_info;
902 static inline void btrfs_check_bounds(void *vptr, size_t len,
903 void *vcontainer, size_t container_len)
906 char *container = vcontainer;
907 WARN_ON(ptr < container);
908 WARN_ON(ptr + len > container + container_len);
911 static inline void btrfs_memcpy(struct btrfs_root *root,
913 void *dst, const void *src, size_t nr)
915 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
916 memcpy(dst, src, nr);
919 static inline void btrfs_memmove(struct btrfs_root *root,
921 void *dst, void *src, size_t nr)
923 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
924 memmove(dst, src, nr);
927 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
929 WARN_ON(!atomic_read(&bh->b_count));
930 mark_buffer_dirty(bh);
933 /* helper function to cast into the data area of the leaf. */
934 #define btrfs_item_ptr(leaf, slot, type) \
935 ((type *)(btrfs_leaf_data(leaf) + \
936 btrfs_item_offset((leaf)->items + (slot))))
939 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
940 struct btrfs_root *root);
941 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
942 struct btrfs_root *root);
943 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
944 *root, u64 num_blocks, u64 search_start, u64
945 search_end, u64 owner, struct btrfs_key *ins);
946 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
947 struct buffer_head *buf);
948 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
949 *root, u64 blocknr, u64 num_blocks, int pin);
950 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
953 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
954 *root, struct btrfs_key *key, struct btrfs_path *p, int
956 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
957 struct btrfs_path *btrfs_alloc_path(void);
958 void btrfs_free_path(struct btrfs_path *p);
959 void btrfs_init_path(struct btrfs_path *p);
960 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
961 struct btrfs_path *path);
962 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
963 *root, struct btrfs_key *key, void *data, u32 data_size);
964 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
965 *root, struct btrfs_path *path, struct btrfs_key
966 *cpu_key, u32 data_size);
967 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
968 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
969 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
970 *root, struct buffer_head *snap);
972 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
973 struct btrfs_key *key);
974 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
975 *root, struct btrfs_key *key, struct btrfs_root_item
977 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
978 *root, struct btrfs_key *key, struct btrfs_root_item
980 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
981 btrfs_root_item *item, struct btrfs_key *key);
983 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
984 *root, const char *name, int name_len, u64 dir,
985 struct btrfs_key *location, u8 type);
986 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
987 *root, struct btrfs_path *path, u64 dir,
988 const char *name, int name_len, int mod);
989 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
990 struct btrfs_root *root,
991 struct btrfs_path *path, u64 dir,
992 u64 objectid, int mod);
993 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
994 const char *name, int name_len);
996 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
997 struct btrfs_root *fs_root,
998 u64 dirid, u64 *objectid);
999 int btrfs_insert_inode_map(struct btrfs_trans_handle *trans,
1000 struct btrfs_root *root,
1001 u64 objectid, struct btrfs_key *location);
1002 int btrfs_lookup_inode_map(struct btrfs_trans_handle *trans,
1003 struct btrfs_root *root, struct btrfs_path *path,
1004 u64 objectid, int mod);
1005 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1008 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1009 *root, u64 objectid, struct btrfs_inode_item
1011 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1012 *root, struct btrfs_path *path,
1013 struct btrfs_key *location, int mod);
1016 int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
1017 struct btrfs_root *root,
1018 u64 objectid, u64 offset,
1019 u64 num_blocks, u64 hint_block,
1021 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1022 struct btrfs_root *root,
1023 struct btrfs_path *path, u64 objectid,
1024 u64 blocknr, int mod);
1025 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1026 struct btrfs_root *root,
1027 u64 objectid, u64 offset,
1028 char *data, size_t len);
1029 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1030 u64 objectid, u64 offset,
1031 char *data, size_t len);
1033 extern struct subsystem btrfs_subsys;