5 #include <linux/buffer_head.h>
6 #include <linux/workqueue.h>
9 struct btrfs_trans_handle;
10 struct btrfs_transaction;
11 extern struct kmem_cache *btrfs_trans_handle_cachep;
12 extern struct kmem_cache *btrfs_transaction_cachep;
13 extern struct kmem_cache *btrfs_bit_radix_cachep;
14 extern struct kmem_cache *btrfs_path_cachep;
16 #define BTRFS_MAGIC "_BtRfS_M"
18 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
19 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
20 #define BTRFS_FS_TREE_OBJECTID 3ULL
21 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
22 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
25 * we can actually store much bigger names, but lets not confuse the rest
28 #define BTRFS_NAME_LEN 255
30 /* 32 bytes in various csum fields */
31 #define BTRFS_CSUM_SIZE 32
32 /* four bytes for CRC32 */
33 #define BTRFS_CRC32_SIZE 4
34 #define BTRFS_EMPTY_DIR_SIZE 6
36 #define BTRFS_FT_UNKNOWN 0
37 #define BTRFS_FT_REG_FILE 1
38 #define BTRFS_FT_DIR 2
39 #define BTRFS_FT_CHRDEV 3
40 #define BTRFS_FT_BLKDEV 4
41 #define BTRFS_FT_FIFO 5
42 #define BTRFS_FT_SOCK 6
43 #define BTRFS_FT_SYMLINK 7
44 #define BTRFS_FT_MAX 8
47 * the key defines the order in the tree, and so it also defines (optimal)
48 * block layout. objectid corresonds to the inode number. The flags
49 * tells us things about the object, and is a kind of stream selector.
50 * so for a given inode, keys with flags of 1 might refer to the inode
51 * data, flags of 2 may point to file data in the btree and flags == 3
52 * may point to extents.
54 * offset is the starting byte offset for this key in the stream.
56 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
57 * in cpu native order. Otherwise they are identical and their sizes
58 * should be the same (ie both packed)
60 struct btrfs_disk_key {
64 } __attribute__ ((__packed__));
70 } __attribute__ ((__packed__));
73 * every tree block (leaf or node) starts with this header.
76 u8 csum[BTRFS_CSUM_SIZE];
77 u8 fsid[16]; /* FS specific uuid */
78 __le64 blocknr; /* which block this node is supposed to live in */
84 } __attribute__ ((__packed__));
86 #define BTRFS_MAX_LEVEL 8
87 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
88 sizeof(struct btrfs_header)) / \
89 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
90 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
91 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
92 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
93 sizeof(struct btrfs_item) - \
94 sizeof(struct btrfs_file_extent_item))
98 * the super block basically lists the main trees of the FS
99 * it currently lacks any block count etc etc
101 struct btrfs_super_block {
102 u8 csum[BTRFS_CSUM_SIZE];
103 /* the first 3 fields must match struct btrfs_header */
104 u8 fsid[16]; /* FS specific uuid */
105 __le64 blocknr; /* this block number */
112 __le64 root_dir_objectid;
113 } __attribute__ ((__packed__));
116 * A leaf is full of items. offset and size tell us where to find
117 * the item in the leaf (relative to the start of the data area)
120 struct btrfs_disk_key key;
123 } __attribute__ ((__packed__));
126 * leaves have an item area and a data area:
127 * [item0, item1....itemN] [free space] [dataN...data1, data0]
129 * The data is separate from the items to get the keys closer together
133 struct btrfs_header header;
134 struct btrfs_item items[];
135 } __attribute__ ((__packed__));
138 * all non-leaf blocks are nodes, they hold only keys and pointers to
141 struct btrfs_key_ptr {
142 struct btrfs_disk_key key;
144 } __attribute__ ((__packed__));
147 struct btrfs_header header;
148 struct btrfs_key_ptr ptrs[];
149 } __attribute__ ((__packed__));
152 * btrfs_paths remember the path taken from the root down to the leaf.
153 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
154 * to any other levels that are present.
156 * The slots array records the index of the item or block pointer
157 * used while walking the tree.
160 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
161 int slots[BTRFS_MAX_LEVEL];
165 * items in the extent btree are used to record the objectid of the
166 * owner of the block and the number of references
168 struct btrfs_extent_item {
171 } __attribute__ ((__packed__));
173 struct btrfs_inode_timespec {
176 } __attribute__ ((__packed__));
179 * there is no padding here on purpose. If you want to extent the inode,
180 * make a new item type
182 struct btrfs_inode_item {
194 struct btrfs_inode_timespec atime;
195 struct btrfs_inode_timespec ctime;
196 struct btrfs_inode_timespec mtime;
197 struct btrfs_inode_timespec otime;
198 } __attribute__ ((__packed__));
200 struct btrfs_dir_item {
201 struct btrfs_disk_key location;
205 } __attribute__ ((__packed__));
207 struct btrfs_root_item {
208 struct btrfs_inode_item inode;
215 } __attribute__ ((__packed__));
217 #define BTRFS_FILE_EXTENT_REG 0
218 #define BTRFS_FILE_EXTENT_INLINE 1
220 struct btrfs_file_extent_item {
224 * disk space consumed by the extent, checksum blocks are included
228 __le64 disk_num_blocks;
230 * the logical offset in file blocks (no csums)
231 * this extent record is for. This allows a file extent to point
232 * into the middle of an existing extent on disk, sharing it
233 * between two snapshots (useful if some bytes in the middle of the
234 * extent have changed
238 * the logical number of file blocks (no csums included)
241 } __attribute__ ((__packed__));
243 struct btrfs_csum_item {
245 } __attribute__ ((__packed__));
247 /* tag for the radix tree of block groups in ram */
248 #define BTRFS_BLOCK_GROUP_DIRTY 0
249 #define BTRFS_BLOCK_GROUP_AVAIL 1
250 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
253 #define BTRFS_BLOCK_GROUP_DATA 1
254 struct btrfs_block_group_item {
257 } __attribute__ ((__packed__));
259 struct btrfs_block_group_cache {
260 struct btrfs_key key;
261 struct btrfs_block_group_item item;
262 struct radix_tree_root *radix;
273 struct btrfs_fs_info {
274 spinlock_t hash_lock;
275 struct btrfs_root *extent_root;
276 struct btrfs_root *tree_root;
277 struct radix_tree_root fs_roots_radix;
278 struct radix_tree_root pending_del_radix;
279 struct radix_tree_root pinned_radix;
280 struct radix_tree_root block_group_radix;
281 struct radix_tree_root block_group_data_radix;
282 struct radix_tree_root extent_map_radix;
284 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
285 int extent_tree_insert_nr;
286 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
287 int extent_tree_prealloc_nr;
290 struct btrfs_transaction *running_transaction;
291 struct btrfs_super_block *disk_super;
292 struct buffer_head *sb_buffer;
293 struct super_block *sb;
294 struct inode *btree_inode;
295 struct mutex trans_mutex;
296 struct mutex fs_mutex;
297 struct list_head trans_list;
298 struct list_head dead_roots;
299 struct crypto_hash *hash_tfm;
300 struct delayed_work trans_work;
306 * in ram representation of the tree. extent_root is used for all allocations
307 * and for the extent tree extent_root root.
310 struct buffer_head *node;
311 struct buffer_head *commit_root;
312 struct btrfs_root_item root_item;
313 struct btrfs_key root_key;
314 struct btrfs_fs_info *fs_info;
322 u64 last_inode_alloc;
325 /* the lower bits in the key flags defines the item type */
326 #define BTRFS_KEY_TYPE_MAX 256
327 #define BTRFS_KEY_TYPE_SHIFT 24
328 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
329 BTRFS_KEY_TYPE_SHIFT)
332 * inode items have the data typically returned from stat and store other
333 * info about object characteristics. There is one for every file and dir in
336 #define BTRFS_INODE_ITEM_KEY 1
338 /* reserve 2-15 close to the inode for later flexibility */
341 * dir items are the name -> inode pointers in a directory. There is one
342 * for every name in a directory.
344 #define BTRFS_DIR_ITEM_KEY 16
345 #define BTRFS_DIR_INDEX_KEY 17
347 * extent data is for file data
349 #define BTRFS_EXTENT_DATA_KEY 18
351 * csum items have the checksums for data in the extents
353 #define BTRFS_CSUM_ITEM_KEY 19
355 /* reserve 20-31 for other file stuff */
358 * root items point to tree roots. There are typically in the root
359 * tree used by the super block to find all the other trees
361 #define BTRFS_ROOT_ITEM_KEY 32
363 * extent items are in the extent map tree. These record which blocks
364 * are used, and how many references there are to each block
366 #define BTRFS_EXTENT_ITEM_KEY 33
369 * block groups give us hints into the extent allocation trees. Which
370 * blocks are free etc etc
372 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
375 * string items are for debugging. They just store a short string of
378 #define BTRFS_STRING_ITEM_KEY 253
381 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
383 return le64_to_cpu(bi->used);
386 static inline void btrfs_set_block_group_used(struct
387 btrfs_block_group_item *bi,
390 bi->used = cpu_to_le64(val);
393 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
395 return le64_to_cpu(i->generation);
398 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
401 i->generation = cpu_to_le64(val);
404 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
406 return le64_to_cpu(i->size);
409 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
411 i->size = cpu_to_le64(val);
414 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
416 return le64_to_cpu(i->nblocks);
419 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
421 i->nblocks = cpu_to_le64(val);
424 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
426 return le64_to_cpu(i->block_group);
429 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
432 i->block_group = cpu_to_le64(val);
435 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
437 return le32_to_cpu(i->nlink);
440 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
442 i->nlink = cpu_to_le32(val);
445 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
447 return le32_to_cpu(i->uid);
450 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
452 i->uid = cpu_to_le32(val);
455 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
457 return le32_to_cpu(i->gid);
460 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
462 i->gid = cpu_to_le32(val);
465 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
467 return le32_to_cpu(i->mode);
470 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
472 i->mode = cpu_to_le32(val);
475 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
477 return le32_to_cpu(i->rdev);
480 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
482 i->rdev = cpu_to_le32(val);
485 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
487 return le16_to_cpu(i->flags);
490 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
492 i->flags = cpu_to_le16(val);
495 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
497 return le16_to_cpu(i->compat_flags);
500 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
503 i->compat_flags = cpu_to_le16(val);
506 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
508 return le64_to_cpu(ts->sec);
511 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
514 ts->sec = cpu_to_le64(val);
517 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
519 return le32_to_cpu(ts->nsec);
522 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
525 ts->nsec = cpu_to_le32(val);
528 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
530 return le32_to_cpu(ei->refs);
533 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
535 ei->refs = cpu_to_le32(val);
538 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
540 return le64_to_cpu(ei->owner);
543 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
545 ei->owner = cpu_to_le64(val);
548 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
550 return le64_to_cpu(n->ptrs[nr].blockptr);
554 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
557 n->ptrs[nr].blockptr = cpu_to_le64(val);
560 static inline u32 btrfs_item_offset(struct btrfs_item *item)
562 return le32_to_cpu(item->offset);
565 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
567 item->offset = cpu_to_le32(val);
570 static inline u32 btrfs_item_end(struct btrfs_item *item)
572 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
575 static inline u16 btrfs_item_size(struct btrfs_item *item)
577 return le16_to_cpu(item->size);
580 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
582 item->size = cpu_to_le16(val);
585 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
587 return le16_to_cpu(d->flags);
590 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
592 d->flags = cpu_to_le16(val);
595 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
600 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
605 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
607 return le16_to_cpu(d->name_len);
610 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
612 d->name_len = cpu_to_le16(val);
615 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
616 struct btrfs_disk_key *disk)
618 cpu->offset = le64_to_cpu(disk->offset);
619 cpu->flags = le32_to_cpu(disk->flags);
620 cpu->objectid = le64_to_cpu(disk->objectid);
623 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
624 struct btrfs_key *cpu)
626 disk->offset = cpu_to_le64(cpu->offset);
627 disk->flags = cpu_to_le32(cpu->flags);
628 disk->objectid = cpu_to_le64(cpu->objectid);
631 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
633 return le64_to_cpu(disk->objectid);
636 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
639 disk->objectid = cpu_to_le64(val);
642 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
644 return le64_to_cpu(disk->offset);
647 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
650 disk->offset = cpu_to_le64(val);
653 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
655 return le32_to_cpu(disk->flags);
658 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
661 disk->flags = cpu_to_le32(val);
664 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
666 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
669 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
672 u32 flags = btrfs_disk_key_flags(key);
673 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
674 val = val << BTRFS_KEY_TYPE_SHIFT;
675 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
676 btrfs_set_disk_key_flags(key, flags);
679 static inline u32 btrfs_key_type(struct btrfs_key *key)
681 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
684 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
686 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
687 val = val << BTRFS_KEY_TYPE_SHIFT;
688 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
691 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
693 return le64_to_cpu(h->blocknr);
696 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
698 h->blocknr = cpu_to_le64(blocknr);
701 static inline u64 btrfs_header_generation(struct btrfs_header *h)
703 return le64_to_cpu(h->generation);
706 static inline void btrfs_set_header_generation(struct btrfs_header *h,
709 h->generation = cpu_to_le64(val);
712 static inline u64 btrfs_header_owner(struct btrfs_header *h)
714 return le64_to_cpu(h->owner);
717 static inline void btrfs_set_header_owner(struct btrfs_header *h,
720 h->owner = cpu_to_le64(val);
723 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
725 return le16_to_cpu(h->nritems);
728 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
730 h->nritems = cpu_to_le16(val);
733 static inline u16 btrfs_header_flags(struct btrfs_header *h)
735 return le16_to_cpu(h->flags);
738 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
740 h->flags = cpu_to_le16(val);
743 static inline int btrfs_header_level(struct btrfs_header *h)
748 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
750 BUG_ON(level > BTRFS_MAX_LEVEL);
754 static inline int btrfs_is_leaf(struct btrfs_node *n)
756 return (btrfs_header_level(&n->header) == 0);
759 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
761 return le64_to_cpu(item->blocknr);
764 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
766 item->blocknr = cpu_to_le64(val);
769 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
771 return le64_to_cpu(item->root_dirid);
774 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
776 item->root_dirid = cpu_to_le64(val);
779 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
781 return le32_to_cpu(item->refs);
784 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
786 item->refs = cpu_to_le32(val);
789 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
791 return le64_to_cpu(s->blocknr);
794 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
796 s->blocknr = cpu_to_le64(val);
799 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
801 return le64_to_cpu(s->generation);
804 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
807 s->generation = cpu_to_le64(val);
810 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
812 return le64_to_cpu(s->root);
815 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
817 s->root = cpu_to_le64(val);
820 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
822 return le64_to_cpu(s->total_blocks);
825 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
828 s->total_blocks = cpu_to_le64(val);
831 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
833 return le64_to_cpu(s->blocks_used);
836 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
839 s->blocks_used = cpu_to_le64(val);
842 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
844 return le32_to_cpu(s->blocksize);
847 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
850 s->blocksize = cpu_to_le32(val);
853 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
855 return le64_to_cpu(s->root_dir_objectid);
858 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
861 s->root_dir_objectid = cpu_to_le64(val);
864 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
866 return (u8 *)l->items;
869 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
873 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
879 static inline char *btrfs_file_extent_inline_start(struct
880 btrfs_file_extent_item *e)
882 return (char *)(&e->disk_blocknr);
885 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
887 return (unsigned long)(&((struct
888 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
891 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
893 struct btrfs_file_extent_item *fe = NULL;
894 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
897 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
900 return le64_to_cpu(e->disk_blocknr);
903 static inline void btrfs_set_file_extent_disk_blocknr(struct
904 btrfs_file_extent_item
907 e->disk_blocknr = cpu_to_le64(val);
910 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
912 return le64_to_cpu(e->generation);
915 static inline void btrfs_set_file_extent_generation(struct
916 btrfs_file_extent_item *e,
919 e->generation = cpu_to_le64(val);
922 static inline u64 btrfs_file_extent_disk_num_blocks(struct
923 btrfs_file_extent_item *e)
925 return le64_to_cpu(e->disk_num_blocks);
928 static inline void btrfs_set_file_extent_disk_num_blocks(struct
929 btrfs_file_extent_item
932 e->disk_num_blocks = cpu_to_le64(val);
935 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
937 return le64_to_cpu(e->offset);
940 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
943 e->offset = cpu_to_le64(val);
946 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
949 return le64_to_cpu(e->num_blocks);
952 static inline void btrfs_set_file_extent_num_blocks(struct
953 btrfs_file_extent_item *e,
956 e->num_blocks = cpu_to_le64(val);
959 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
961 return sb->s_fs_info;
964 static inline void btrfs_check_bounds(void *vptr, size_t len,
965 void *vcontainer, size_t container_len)
968 char *container = vcontainer;
969 WARN_ON(ptr < container);
970 WARN_ON(ptr + len > container + container_len);
973 static inline void btrfs_memcpy(struct btrfs_root *root,
975 void *dst, const void *src, size_t nr)
977 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
978 memcpy(dst, src, nr);
981 static inline void btrfs_memmove(struct btrfs_root *root,
983 void *dst, void *src, size_t nr)
985 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
986 memmove(dst, src, nr);
989 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
991 WARN_ON(!atomic_read(&bh->b_count));
992 mark_buffer_dirty(bh);
995 /* helper function to cast into the data area of the leaf. */
996 #define btrfs_item_ptr(leaf, slot, type) \
997 ((type *)(btrfs_leaf_data(leaf) + \
998 btrfs_item_offset((leaf)->items + (slot))))
1001 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1002 btrfs_fs_info *info,
1004 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1005 struct btrfs_block_group_cache
1006 *hint, u64 search_start,
1007 int data, int owner);
1008 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1009 struct btrfs_root *root);
1010 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1011 struct btrfs_root *root, u64 hint);
1012 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1013 struct btrfs_root *root, u64 owner,
1014 u64 num_blocks, u64 search_start,
1015 u64 search_end, struct btrfs_key *ins, int data);
1016 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1017 struct buffer_head *buf);
1018 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1019 *root, u64 blocknr, u64 num_blocks, int pin);
1020 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1022 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1023 struct btrfs_root *root,
1024 u64 blocknr, u64 num_blocks);
1025 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1026 struct btrfs_root *root);
1027 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1028 int btrfs_read_block_groups(struct btrfs_root *root);
1030 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1031 *root, struct btrfs_path *path, u32 data_size);
1032 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1033 struct btrfs_root *root,
1034 struct btrfs_path *path,
1036 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1037 *root, struct btrfs_key *key, struct btrfs_path *p, int
1039 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1040 struct btrfs_path *btrfs_alloc_path(void);
1041 void btrfs_free_path(struct btrfs_path *p);
1042 void btrfs_init_path(struct btrfs_path *p);
1043 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1044 struct btrfs_path *path);
1045 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1046 *root, struct btrfs_key *key, void *data, u32 data_size);
1047 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1048 *root, struct btrfs_path *path, struct btrfs_key
1049 *cpu_key, u32 data_size);
1050 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1051 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1052 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1053 *root, struct buffer_head *snap);
1055 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1056 struct btrfs_key *key);
1057 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1058 *root, struct btrfs_key *key, struct btrfs_root_item
1060 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1061 *root, struct btrfs_key *key, struct btrfs_root_item
1063 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1064 btrfs_root_item *item, struct btrfs_key *key);
1066 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1067 *root, const char *name, int name_len, u64 dir,
1068 struct btrfs_key *location, u8 type);
1069 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1070 struct btrfs_root *root,
1071 struct btrfs_path *path, u64 dir,
1072 const char *name, int name_len,
1074 struct btrfs_dir_item *
1075 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1076 struct btrfs_root *root,
1077 struct btrfs_path *path, u64 dir,
1078 u64 objectid, const char *name, int name_len,
1080 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1081 struct btrfs_path *path,
1082 const char *name, int name_len);
1083 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1084 struct btrfs_root *root,
1085 struct btrfs_path *path,
1086 struct btrfs_dir_item *di);
1088 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1089 struct btrfs_root *fs_root,
1090 u64 dirid, u64 *objectid);
1091 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1094 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1095 *root, u64 objectid, struct btrfs_inode_item
1097 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1098 *root, struct btrfs_path *path,
1099 struct btrfs_key *location, int mod);
1102 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1103 struct btrfs_root *root,
1104 u64 objectid, u64 pos, u64 offset,
1105 u64 disk_num_blocks,
1107 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1108 struct btrfs_root *root,
1109 struct btrfs_path *path, u64 objectid,
1110 u64 blocknr, int mod);
1111 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1112 struct btrfs_root *root,
1113 u64 objectid, u64 offset,
1114 char *data, size_t len);
1115 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1116 u64 objectid, u64 offset,
1117 char *data, size_t len);
1118 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1119 struct btrfs_root *root,
1120 struct btrfs_path *path,
1121 u64 objectid, u64 offset,
1123 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1124 struct btrfs_root *root, struct btrfs_path *path,