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_DEV_TREE_OBJECTID 2ULL
17 #define BTRFS_EXTENT_TREE_OBJECTID 3ULL
18 #define BTRFS_FS_TREE_OBJECTID 4ULL
19 #define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
20 #define BTRFS_FIRST_FREE_OBJECTID 6ULL
23 * we can actually store much bigger names, but lets not confuse the rest
26 #define BTRFS_NAME_LEN 255
28 /* 32 bytes in various csum fields */
29 #define BTRFS_CSUM_SIZE 32
32 * the key defines the order in the tree, and so it also defines (optimal)
33 * block layout. objectid corresonds to the inode number. The flags
34 * tells us things about the object, and is a kind of stream selector.
35 * so for a given inode, keys with flags of 1 might refer to the inode
36 * data, flags of 2 may point to file data in the btree and flags == 3
37 * may point to extents.
39 * offset is the starting byte offset for this key in the stream.
41 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
42 * in cpu native order. Otherwise they are identical and their sizes
43 * should be the same (ie both packed)
45 struct btrfs_disk_key {
49 } __attribute__ ((__packed__));
55 } __attribute__ ((__packed__));
58 * every tree block (leaf or node) starts with this header.
61 u8 csum[BTRFS_CSUM_SIZE];
62 u8 fsid[16]; /* FS specific uuid */
63 __le64 blocknr; /* which block this node is supposed to live in */
68 } __attribute__ ((__packed__));
70 #define BTRFS_MAX_LEVEL 8
71 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
72 sizeof(struct btrfs_header)) / \
73 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
74 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
75 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
79 * the super block basically lists the main trees of the FS
80 * it currently lacks any block count etc etc
82 struct btrfs_super_block {
83 u8 csum[BTRFS_CSUM_SIZE];
84 /* the first 3 fields must match struct btrfs_header */
85 u8 fsid[16]; /* FS specific uuid */
86 __le64 blocknr; /* this block number */
93 __le64 root_dir_objectid;
94 /* fields below here vary with the underlying disk */
95 __le64 device_block_start;
96 __le64 device_num_blocks;
98 } __attribute__ ((__packed__));
101 * A leaf is full of items. offset and size tell us where to find
102 * the item in the leaf (relative to the start of the data area)
105 struct btrfs_disk_key key;
108 } __attribute__ ((__packed__));
111 * leaves have an item area and a data area:
112 * [item0, item1....itemN] [free space] [dataN...data1, data0]
114 * The data is separate from the items to get the keys closer together
118 struct btrfs_header header;
119 struct btrfs_item items[];
120 } __attribute__ ((__packed__));
123 * all non-leaf blocks are nodes, they hold only keys and pointers to
126 struct btrfs_key_ptr {
127 struct btrfs_disk_key key;
129 } __attribute__ ((__packed__));
132 struct btrfs_header header;
133 struct btrfs_key_ptr ptrs[];
134 } __attribute__ ((__packed__));
137 * btrfs_paths remember the path taken from the root down to the leaf.
138 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
139 * to any other levels that are present.
141 * The slots array records the index of the item or block pointer
142 * used while walking the tree.
145 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
146 int slots[BTRFS_MAX_LEVEL];
150 * items in the extent btree are used to record the objectid of the
151 * owner of the block and the number of references
153 struct btrfs_extent_item {
155 } __attribute__ ((__packed__));
157 struct btrfs_inode_timespec {
160 } __attribute__ ((__packed__));
163 * there is no padding here on purpose. If you want to extent the inode,
164 * make a new item type
166 struct btrfs_inode_item {
177 struct btrfs_inode_timespec atime;
178 struct btrfs_inode_timespec ctime;
179 struct btrfs_inode_timespec mtime;
180 struct btrfs_inode_timespec otime;
181 } __attribute__ ((__packed__));
183 /* inline data is just a blob of bytes */
184 struct btrfs_inline_data_item {
186 } __attribute__ ((__packed__));
188 struct btrfs_dir_item {
189 struct btrfs_disk_key location;
193 } __attribute__ ((__packed__));
195 struct btrfs_root_item {
196 struct btrfs_inode_item inode;
203 } __attribute__ ((__packed__));
205 struct btrfs_file_extent_item {
208 * disk space consumed by the extent, checksum blocks are included
212 __le64 disk_num_blocks;
214 * the logical offset in file blocks (no csums)
215 * this extent record is for. This allows a file extent to point
216 * into the middle of an existing extent on disk, sharing it
217 * between two snapshots (useful if some bytes in the middle of the
218 * extent have changed
222 * the logical number of file blocks (no csums included)
225 } __attribute__ ((__packed__));
227 struct btrfs_csum_item {
228 u8 csum[BTRFS_CSUM_SIZE];
229 } __attribute__ ((__packed__));
231 struct btrfs_device_item {
233 } __attribute__ ((__packed__));
236 struct btrfs_fs_info {
237 struct btrfs_root *extent_root;
238 struct btrfs_root *tree_root;
239 struct btrfs_root *dev_root;
240 struct btrfs_key current_insert;
241 struct btrfs_key last_insert;
242 struct radix_tree_root fs_roots_radix;
243 struct radix_tree_root pending_del_radix;
244 struct radix_tree_root pinned_radix;
245 struct radix_tree_root dev_radix;
247 struct btrfs_transaction *running_transaction;
248 struct btrfs_super_block *disk_super;
249 struct buffer_head *sb_buffer;
250 struct super_block *sb;
251 struct inode *btree_inode;
252 struct mutex trans_mutex;
253 struct mutex fs_mutex;
254 struct crypto_hash *hash_tfm;
255 spinlock_t hash_lock;
260 * in ram representation of the tree. extent_root is used for all allocations
261 * and for the extent tree extent_root root. current_insert is used
262 * only for the extent tree.
265 struct buffer_head *node;
266 struct buffer_head *commit_root;
267 struct btrfs_root_item root_item;
268 struct btrfs_key root_key;
269 struct btrfs_fs_info *fs_info;
277 u64 last_inode_alloc;
280 /* the lower bits in the key flags defines the item type */
281 #define BTRFS_KEY_TYPE_MAX 256
282 #define BTRFS_KEY_TYPE_MASK (BTRFS_KEY_TYPE_MAX - 1)
284 #define BTRFS_KEY_OVERFLOW_MAX 128
285 #define BTRFS_KEY_OVERFLOW_SHIFT 8
286 #define BTRFS_KEY_OVERFLOW_MASK (0x7FULL << BTRFS_KEY_OVERFLOW_SHIFT)
289 * inode items have the data typically returned from stat and store other
290 * info about object characteristics. There is one for every file and dir in
293 #define BTRFS_INODE_ITEM_KEY 1
296 * dir items are the name -> inode pointers in a directory. There is one
297 * for every name in a directory.
299 #define BTRFS_DIR_ITEM_KEY 2
300 #define BTRFS_DIR_INDEX_KEY 3
302 * inline data is file data that fits in the btree.
304 #define BTRFS_INLINE_DATA_KEY 4
306 * extent data is for data that can't fit in the btree. It points to
307 * a (hopefully) huge chunk of disk
309 #define BTRFS_EXTENT_DATA_KEY 5
311 * csum items have the checksums for data in the extents
313 #define BTRFS_CSUM_ITEM_KEY 6
316 * root items point to tree roots. There are typically in the root
317 * tree used by the super block to find all the other trees
319 #define BTRFS_ROOT_ITEM_KEY 7
321 * extent items are in the extent map tree. These record which blocks
322 * are used, and how many references there are to each block
324 #define BTRFS_EXTENT_ITEM_KEY 8
327 * dev items list the devices that make up the FS
329 #define BTRFS_DEV_ITEM_KEY 9
332 * string items are for debugging. They just store a short string of
335 #define BTRFS_STRING_ITEM_KEY 10
337 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
339 return le64_to_cpu(i->generation);
342 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
345 i->generation = cpu_to_le64(val);
348 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
350 return le64_to_cpu(i->size);
353 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
355 i->size = cpu_to_le64(val);
358 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
360 return le64_to_cpu(i->nblocks);
363 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
365 i->nblocks = cpu_to_le64(val);
368 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
370 return le32_to_cpu(i->nlink);
373 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
375 i->nlink = cpu_to_le32(val);
378 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
380 return le32_to_cpu(i->uid);
383 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
385 i->uid = cpu_to_le32(val);
388 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
390 return le32_to_cpu(i->gid);
393 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
395 i->gid = cpu_to_le32(val);
398 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
400 return le32_to_cpu(i->mode);
403 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
405 i->mode = cpu_to_le32(val);
408 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
410 return le32_to_cpu(i->rdev);
413 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
415 i->rdev = cpu_to_le32(val);
418 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
420 return le16_to_cpu(i->flags);
423 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
425 i->flags = cpu_to_le16(val);
428 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
430 return le16_to_cpu(i->compat_flags);
433 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
436 i->compat_flags = cpu_to_le16(val);
439 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
441 return le64_to_cpu(ts->sec);
444 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
447 ts->sec = cpu_to_le64(val);
450 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
452 return le32_to_cpu(ts->nsec);
455 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
458 ts->nsec = cpu_to_le32(val);
461 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
463 return le32_to_cpu(ei->refs);
466 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
468 ei->refs = cpu_to_le32(val);
471 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
473 return le64_to_cpu(n->ptrs[nr].blockptr);
476 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
479 n->ptrs[nr].blockptr = cpu_to_le64(val);
482 static inline u32 btrfs_item_offset(struct btrfs_item *item)
484 return le32_to_cpu(item->offset);
487 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
489 item->offset = cpu_to_le32(val);
492 static inline u32 btrfs_item_end(struct btrfs_item *item)
494 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
497 static inline u16 btrfs_item_size(struct btrfs_item *item)
499 return le16_to_cpu(item->size);
502 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
504 item->size = cpu_to_le16(val);
507 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
509 return le16_to_cpu(d->flags);
512 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
514 d->flags = cpu_to_le16(val);
517 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
522 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
527 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
529 return le16_to_cpu(d->name_len);
532 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
534 d->name_len = cpu_to_le16(val);
537 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
538 struct btrfs_disk_key *disk)
540 cpu->offset = le64_to_cpu(disk->offset);
541 cpu->flags = le32_to_cpu(disk->flags);
542 cpu->objectid = le64_to_cpu(disk->objectid);
545 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
546 struct btrfs_key *cpu)
548 disk->offset = cpu_to_le64(cpu->offset);
549 disk->flags = cpu_to_le32(cpu->flags);
550 disk->objectid = cpu_to_le64(cpu->objectid);
553 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
555 return le64_to_cpu(disk->objectid);
558 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
561 disk->objectid = cpu_to_le64(val);
564 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
566 return le64_to_cpu(disk->offset);
569 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
572 disk->offset = cpu_to_le64(val);
575 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
577 return le32_to_cpu(disk->flags);
580 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
583 disk->flags = cpu_to_le32(val);
586 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
588 u32 over = key->flags & BTRFS_KEY_OVERFLOW_MASK;
589 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
592 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
594 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
595 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
596 key->flags = (key->flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
599 static inline u32 btrfs_key_type(struct btrfs_key *key)
601 return key->flags & BTRFS_KEY_TYPE_MASK;
604 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
606 return le32_to_cpu(key->flags) & BTRFS_KEY_TYPE_MASK;
609 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 type)
611 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
612 key->flags = (key->flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
615 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u32 type)
617 u32 flags = btrfs_disk_key_flags(key);
618 BUG_ON(type >= BTRFS_KEY_TYPE_MAX);
619 flags = (flags & ~((u64)BTRFS_KEY_TYPE_MASK)) | type;
620 btrfs_set_disk_key_flags(key, flags);
623 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
625 u32 over = le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
626 return over >> BTRFS_KEY_OVERFLOW_SHIFT;
629 static inline void btrfs_set_disK_key_overflow(struct btrfs_disk_key *key,
632 u32 flags = btrfs_disk_key_flags(key);
633 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
634 over = over << BTRFS_KEY_OVERFLOW_SHIFT;
635 flags = (flags & ~((u64)BTRFS_KEY_OVERFLOW_MASK)) | over;
636 btrfs_set_disk_key_flags(key, flags);
639 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
641 return le64_to_cpu(h->blocknr);
644 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
646 h->blocknr = cpu_to_le64(blocknr);
649 static inline u64 btrfs_header_generation(struct btrfs_header *h)
651 return le64_to_cpu(h->generation);
654 static inline void btrfs_set_header_generation(struct btrfs_header *h,
657 h->generation = cpu_to_le64(val);
660 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
662 return le16_to_cpu(h->nritems);
665 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
667 h->nritems = cpu_to_le16(val);
670 static inline u16 btrfs_header_flags(struct btrfs_header *h)
672 return le16_to_cpu(h->flags);
675 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
677 h->flags = cpu_to_le16(val);
680 static inline int btrfs_header_level(struct btrfs_header *h)
685 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
687 BUG_ON(level > BTRFS_MAX_LEVEL);
691 static inline int btrfs_is_leaf(struct btrfs_node *n)
693 return (btrfs_header_level(&n->header) == 0);
696 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
698 return le64_to_cpu(item->blocknr);
701 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
703 item->blocknr = cpu_to_le64(val);
706 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
708 return le64_to_cpu(item->root_dirid);
711 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
713 item->root_dirid = cpu_to_le64(val);
716 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
718 return le32_to_cpu(item->refs);
721 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
723 item->refs = cpu_to_le32(val);
726 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
728 return le64_to_cpu(s->blocknr);
731 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
733 s->blocknr = cpu_to_le64(val);
736 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
738 return le64_to_cpu(s->generation);
741 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
744 s->generation = cpu_to_le64(val);
747 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
749 return le64_to_cpu(s->root);
752 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
754 s->root = cpu_to_le64(val);
757 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
759 return le64_to_cpu(s->total_blocks);
762 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
765 s->total_blocks = cpu_to_le64(val);
768 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
770 return le64_to_cpu(s->blocks_used);
773 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
776 s->blocks_used = cpu_to_le64(val);
779 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
781 return le32_to_cpu(s->blocksize);
784 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
787 s->blocksize = cpu_to_le32(val);
790 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
792 return le64_to_cpu(s->root_dir_objectid);
795 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
798 s->root_dir_objectid = cpu_to_le64(val);
801 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
803 return le64_to_cpu(s->device_block_start);
806 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
809 s->device_block_start = cpu_to_le64(val);
812 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
814 return le64_to_cpu(s->device_num_blocks);
817 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
820 s->device_num_blocks = cpu_to_le64(val);
823 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
825 return le64_to_cpu(s->device_root);
828 static inline void btrfs_set_super_device_root(struct btrfs_super_block
831 s->device_root = cpu_to_le64(val);
835 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
837 return (u8 *)l->items;
840 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
843 return le64_to_cpu(e->disk_blocknr);
846 static inline void btrfs_set_file_extent_disk_blocknr(struct
847 btrfs_file_extent_item
850 e->disk_blocknr = cpu_to_le64(val);
853 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
855 return le64_to_cpu(e->generation);
858 static inline void btrfs_set_file_extent_generation(struct
859 btrfs_file_extent_item *e,
862 e->generation = cpu_to_le64(val);
865 static inline u64 btrfs_file_extent_disk_num_blocks(struct
866 btrfs_file_extent_item *e)
868 return le64_to_cpu(e->disk_num_blocks);
871 static inline void btrfs_set_file_extent_disk_num_blocks(struct
872 btrfs_file_extent_item
875 e->disk_num_blocks = cpu_to_le64(val);
878 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
880 return le64_to_cpu(e->offset);
883 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
886 e->offset = cpu_to_le64(val);
889 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
892 return le64_to_cpu(e->num_blocks);
895 static inline void btrfs_set_file_extent_num_blocks(struct
896 btrfs_file_extent_item *e,
899 e->num_blocks = cpu_to_le64(val);
902 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
904 return le16_to_cpu(d->pathlen);
907 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
910 d->pathlen = cpu_to_le16(val);
913 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
915 return sb->s_fs_info;
918 static inline void btrfs_check_bounds(void *vptr, size_t len,
919 void *vcontainer, size_t container_len)
922 char *container = vcontainer;
923 WARN_ON(ptr < container);
924 WARN_ON(ptr + len > container + container_len);
927 static inline void btrfs_memcpy(struct btrfs_root *root,
929 void *dst, const void *src, size_t nr)
931 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
932 memcpy(dst, src, nr);
935 static inline void btrfs_memmove(struct btrfs_root *root,
937 void *dst, void *src, size_t nr)
939 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
940 memmove(dst, src, nr);
943 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
945 WARN_ON(!atomic_read(&bh->b_count));
946 mark_buffer_dirty(bh);
949 /* helper function to cast into the data area of the leaf. */
950 #define btrfs_item_ptr(leaf, slot, type) \
951 ((type *)(btrfs_leaf_data(leaf) + \
952 btrfs_item_offset((leaf)->items + (slot))))
955 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
956 struct btrfs_root *root);
957 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
958 struct btrfs_root *root);
959 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
960 *root, u64 num_blocks, u64 search_start, u64
961 search_end, struct btrfs_key *ins);
962 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
963 struct buffer_head *buf);
964 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
965 *root, u64 blocknr, u64 num_blocks, int pin);
966 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
969 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
970 *root, struct btrfs_key *key, struct btrfs_path *p, int
972 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
973 struct btrfs_path *btrfs_alloc_path(void);
974 void btrfs_free_path(struct btrfs_path *p);
975 void btrfs_init_path(struct btrfs_path *p);
976 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
977 struct btrfs_path *path);
978 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
979 *root, struct btrfs_key *key, void *data, u32 data_size);
980 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
981 *root, struct btrfs_path *path, struct btrfs_key
982 *cpu_key, u32 data_size);
983 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
984 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
985 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
986 *root, struct buffer_head *snap);
988 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
989 struct btrfs_key *key);
990 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
991 *root, struct btrfs_key *key, struct btrfs_root_item
993 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
994 *root, struct btrfs_key *key, struct btrfs_root_item
996 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
997 btrfs_root_item *item, struct btrfs_key *key);
999 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1000 *root, const char *name, int name_len, u64 dir,
1001 struct btrfs_key *location, u8 type);
1002 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1003 *root, struct btrfs_path *path, u64 dir,
1004 const char *name, int name_len, int mod);
1005 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1006 struct btrfs_root *root,
1007 struct btrfs_path *path, u64 dir,
1008 u64 objectid, int mod);
1009 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
1010 const char *name, int name_len);
1012 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1013 struct btrfs_root *fs_root,
1014 u64 dirid, u64 *objectid);
1015 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1018 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1019 *root, u64 objectid, struct btrfs_inode_item
1021 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1022 *root, struct btrfs_path *path,
1023 struct btrfs_key *location, int mod);
1026 int btrfs_alloc_file_extent(struct btrfs_trans_handle *trans,
1027 struct btrfs_root *root,
1028 u64 objectid, u64 offset,
1029 u64 num_blocks, u64 hint_block,
1031 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1032 struct btrfs_root *root,
1033 struct btrfs_path *path, u64 objectid,
1034 u64 blocknr, int mod);
1035 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1036 struct btrfs_root *root,
1037 u64 objectid, u64 offset,
1038 char *data, size_t len);
1039 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1040 u64 objectid, u64 offset,
1041 char *data, size_t len);
1043 extern struct subsystem btrfs_subsys;