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_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_DEV_TREE_OBJECTID 2ULL
20 #define BTRFS_EXTENT_TREE_OBJECTID 3ULL
21 #define BTRFS_FS_TREE_OBJECTID 4ULL
22 #define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
23 #define BTRFS_FIRST_FREE_OBJECTID 6ULL
26 * we can actually store much bigger names, but lets not confuse the rest
29 #define BTRFS_NAME_LEN 255
31 /* 32 bytes in various csum fields */
32 #define BTRFS_CSUM_SIZE 32
35 * the key defines the order in the tree, and so it also defines (optimal)
36 * block layout. objectid corresonds to the inode number. The flags
37 * tells us things about the object, and is a kind of stream selector.
38 * so for a given inode, keys with flags of 1 might refer to the inode
39 * data, flags of 2 may point to file data in the btree and flags == 3
40 * may point to extents.
42 * offset is the starting byte offset for this key in the stream.
44 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
45 * in cpu native order. Otherwise they are identical and their sizes
46 * should be the same (ie both packed)
48 struct btrfs_disk_key {
52 } __attribute__ ((__packed__));
58 } __attribute__ ((__packed__));
61 * every tree block (leaf or node) starts with this header.
64 u8 csum[BTRFS_CSUM_SIZE];
65 u8 fsid[16]; /* FS specific uuid */
66 __le64 blocknr; /* which block this node is supposed to live in */
72 } __attribute__ ((__packed__));
74 #define BTRFS_MAX_LEVEL 8
75 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
76 sizeof(struct btrfs_header)) / \
77 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
78 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
79 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
80 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
81 sizeof(struct btrfs_item) - \
82 sizeof(struct btrfs_file_extent_item))
86 * the super block basically lists the main trees of the FS
87 * it currently lacks any block count etc etc
89 struct btrfs_super_block {
90 u8 csum[BTRFS_CSUM_SIZE];
91 /* the first 3 fields must match struct btrfs_header */
92 u8 fsid[16]; /* FS specific uuid */
93 __le64 blocknr; /* this block number */
100 __le64 root_dir_objectid;
101 __le64 last_device_id;
102 /* fields below here vary with the underlying disk */
103 __le64 device_block_start;
104 __le64 device_num_blocks;
107 } __attribute__ ((__packed__));
110 * A leaf is full of items. offset and size tell us where to find
111 * the item in the leaf (relative to the start of the data area)
114 struct btrfs_disk_key key;
117 } __attribute__ ((__packed__));
120 * leaves have an item area and a data area:
121 * [item0, item1....itemN] [free space] [dataN...data1, data0]
123 * The data is separate from the items to get the keys closer together
127 struct btrfs_header header;
128 struct btrfs_item items[];
129 } __attribute__ ((__packed__));
132 * all non-leaf blocks are nodes, they hold only keys and pointers to
135 struct btrfs_key_ptr {
136 struct btrfs_disk_key key;
138 } __attribute__ ((__packed__));
141 struct btrfs_header header;
142 struct btrfs_key_ptr ptrs[];
143 } __attribute__ ((__packed__));
146 * btrfs_paths remember the path taken from the root down to the leaf.
147 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
148 * to any other levels that are present.
150 * The slots array records the index of the item or block pointer
151 * used while walking the tree.
154 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
155 int slots[BTRFS_MAX_LEVEL];
159 * items in the extent btree are used to record the objectid of the
160 * owner of the block and the number of references
162 struct btrfs_extent_item {
165 } __attribute__ ((__packed__));
167 struct btrfs_inode_timespec {
170 } __attribute__ ((__packed__));
173 * there is no padding here on purpose. If you want to extent the inode,
174 * make a new item type
176 struct btrfs_inode_item {
188 struct btrfs_inode_timespec atime;
189 struct btrfs_inode_timespec ctime;
190 struct btrfs_inode_timespec mtime;
191 struct btrfs_inode_timespec otime;
192 } __attribute__ ((__packed__));
194 struct btrfs_dir_item {
195 struct btrfs_disk_key location;
199 } __attribute__ ((__packed__));
201 struct btrfs_root_item {
202 struct btrfs_inode_item inode;
209 } __attribute__ ((__packed__));
211 #define BTRFS_FILE_EXTENT_REG 0
212 #define BTRFS_FILE_EXTENT_INLINE 1
214 struct btrfs_file_extent_item {
218 * disk space consumed by the extent, checksum blocks are included
222 __le64 disk_num_blocks;
224 * the logical offset in file blocks (no csums)
225 * this extent record is for. This allows a file extent to point
226 * into the middle of an existing extent on disk, sharing it
227 * between two snapshots (useful if some bytes in the middle of the
228 * extent have changed
232 * the logical number of file blocks (no csums included)
235 } __attribute__ ((__packed__));
237 struct btrfs_csum_item {
238 u8 csum[BTRFS_CSUM_SIZE];
239 } __attribute__ ((__packed__));
241 struct btrfs_device_item {
244 } __attribute__ ((__packed__));
246 /* tag for the radix tree of block groups in ram */
247 #define BTRFS_BLOCK_GROUP_DIRTY 0
248 #define BTRFS_BLOCK_GROUP_AVAIL 1
249 #define BTRFS_BLOCK_GROUP_HINTS 8
250 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
251 struct btrfs_block_group_item {
253 } __attribute__ ((__packed__));
255 struct btrfs_block_group_cache {
256 struct btrfs_key key;
257 struct btrfs_block_group_item item;
265 struct btrfs_fs_info {
266 struct btrfs_root *extent_root;
267 struct btrfs_root *tree_root;
268 struct btrfs_root *dev_root;
269 struct radix_tree_root fs_roots_radix;
270 struct radix_tree_root pending_del_radix;
271 struct radix_tree_root pinned_radix;
272 struct radix_tree_root dev_radix;
273 struct radix_tree_root block_group_radix;
274 struct radix_tree_root block_group_data_radix;
276 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
277 int extent_tree_insert_nr;
278 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
279 int extent_tree_prealloc_nr;
282 struct btrfs_transaction *running_transaction;
283 struct btrfs_super_block *disk_super;
284 struct buffer_head *sb_buffer;
285 struct super_block *sb;
286 struct inode *btree_inode;
287 struct mutex trans_mutex;
288 struct mutex fs_mutex;
289 struct list_head trans_list;
290 struct crypto_hash *hash_tfm;
291 spinlock_t hash_lock;
297 * in ram representation of the tree. extent_root is used for all allocations
298 * and for the extent tree extent_root root.
301 struct buffer_head *node;
302 struct buffer_head *commit_root;
303 struct btrfs_root_item root_item;
304 struct btrfs_key root_key;
305 struct btrfs_fs_info *fs_info;
313 u64 last_inode_alloc;
316 /* the lower bits in the key flags defines the item type */
317 #define BTRFS_KEY_TYPE_MAX 256
318 #define BTRFS_KEY_TYPE_SHIFT 24
319 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
320 BTRFS_KEY_TYPE_SHIFT)
323 * inode items have the data typically returned from stat and store other
324 * info about object characteristics. There is one for every file and dir in
327 #define BTRFS_INODE_ITEM_KEY 1
329 /* reserve 2-15 close to the inode for later flexibility */
332 * dir items are the name -> inode pointers in a directory. There is one
333 * for every name in a directory.
335 #define BTRFS_DIR_ITEM_KEY 16
336 #define BTRFS_DIR_INDEX_KEY 17
338 * extent data is for file data
340 #define BTRFS_EXTENT_DATA_KEY 18
342 * csum items have the checksums for data in the extents
344 #define BTRFS_CSUM_ITEM_KEY 19
346 /* reserve 20-31 for other file stuff */
349 * root items point to tree roots. There are typically in the root
350 * tree used by the super block to find all the other trees
352 #define BTRFS_ROOT_ITEM_KEY 32
354 * extent items are in the extent map tree. These record which blocks
355 * are used, and how many references there are to each block
357 #define BTRFS_EXTENT_ITEM_KEY 33
360 * block groups give us hints into the extent allocation trees. Which
361 * blocks are free etc etc
363 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
366 * dev items list the devices that make up the FS
368 #define BTRFS_DEV_ITEM_KEY 35
371 * string items are for debugging. They just store a short string of
374 #define BTRFS_STRING_ITEM_KEY 253
377 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
379 return le64_to_cpu(bi->used);
382 static inline void btrfs_set_block_group_used(struct
383 btrfs_block_group_item *bi,
386 bi->used = cpu_to_le64(val);
389 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
391 return le64_to_cpu(i->generation);
394 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
397 i->generation = cpu_to_le64(val);
400 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
402 return le64_to_cpu(i->size);
405 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
407 i->size = cpu_to_le64(val);
410 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
412 return le64_to_cpu(i->nblocks);
415 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
417 i->nblocks = cpu_to_le64(val);
420 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
422 return le64_to_cpu(i->block_group);
425 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
428 i->block_group = cpu_to_le64(val);
431 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
433 return le32_to_cpu(i->nlink);
436 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
438 i->nlink = cpu_to_le32(val);
441 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
443 return le32_to_cpu(i->uid);
446 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
448 i->uid = cpu_to_le32(val);
451 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
453 return le32_to_cpu(i->gid);
456 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
458 i->gid = cpu_to_le32(val);
461 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
463 return le32_to_cpu(i->mode);
466 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
468 i->mode = cpu_to_le32(val);
471 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
473 return le32_to_cpu(i->rdev);
476 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
478 i->rdev = cpu_to_le32(val);
481 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
483 return le16_to_cpu(i->flags);
486 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
488 i->flags = cpu_to_le16(val);
491 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
493 return le16_to_cpu(i->compat_flags);
496 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
499 i->compat_flags = cpu_to_le16(val);
502 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
504 return le64_to_cpu(ts->sec);
507 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
510 ts->sec = cpu_to_le64(val);
513 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
515 return le32_to_cpu(ts->nsec);
518 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
521 ts->nsec = cpu_to_le32(val);
524 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
526 return le32_to_cpu(ei->refs);
529 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
531 ei->refs = cpu_to_le32(val);
534 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
536 return le64_to_cpu(ei->owner);
539 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
541 ei->owner = cpu_to_le64(val);
544 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
546 return le64_to_cpu(n->ptrs[nr].blockptr);
550 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
553 n->ptrs[nr].blockptr = cpu_to_le64(val);
556 static inline u32 btrfs_item_offset(struct btrfs_item *item)
558 return le32_to_cpu(item->offset);
561 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
563 item->offset = cpu_to_le32(val);
566 static inline u32 btrfs_item_end(struct btrfs_item *item)
568 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
571 static inline u16 btrfs_item_size(struct btrfs_item *item)
573 return le16_to_cpu(item->size);
576 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
578 item->size = cpu_to_le16(val);
581 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
583 return le16_to_cpu(d->flags);
586 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
588 d->flags = cpu_to_le16(val);
591 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
596 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
601 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
603 return le16_to_cpu(d->name_len);
606 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
608 d->name_len = cpu_to_le16(val);
611 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
612 struct btrfs_disk_key *disk)
614 cpu->offset = le64_to_cpu(disk->offset);
615 cpu->flags = le32_to_cpu(disk->flags);
616 cpu->objectid = le64_to_cpu(disk->objectid);
619 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
620 struct btrfs_key *cpu)
622 disk->offset = cpu_to_le64(cpu->offset);
623 disk->flags = cpu_to_le32(cpu->flags);
624 disk->objectid = cpu_to_le64(cpu->objectid);
627 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
629 return le64_to_cpu(disk->objectid);
632 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
635 disk->objectid = cpu_to_le64(val);
638 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
640 return le64_to_cpu(disk->offset);
643 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
646 disk->offset = cpu_to_le64(val);
649 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
651 return le32_to_cpu(disk->flags);
654 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
657 disk->flags = cpu_to_le32(val);
660 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
662 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
665 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
668 u32 flags = btrfs_disk_key_flags(key);
669 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
670 val = val << BTRFS_KEY_TYPE_SHIFT;
671 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
672 btrfs_set_disk_key_flags(key, flags);
675 static inline u32 btrfs_key_type(struct btrfs_key *key)
677 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
680 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
682 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
683 val = val << BTRFS_KEY_TYPE_SHIFT;
684 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
687 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
689 return le64_to_cpu(h->blocknr);
692 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
694 h->blocknr = cpu_to_le64(blocknr);
697 static inline u64 btrfs_header_generation(struct btrfs_header *h)
699 return le64_to_cpu(h->generation);
702 static inline void btrfs_set_header_generation(struct btrfs_header *h,
705 h->generation = cpu_to_le64(val);
708 static inline u64 btrfs_header_owner(struct btrfs_header *h)
710 return le64_to_cpu(h->owner);
713 static inline void btrfs_set_header_owner(struct btrfs_header *h,
716 h->owner = cpu_to_le64(val);
719 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
721 return le16_to_cpu(h->nritems);
724 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
726 h->nritems = cpu_to_le16(val);
729 static inline u16 btrfs_header_flags(struct btrfs_header *h)
731 return le16_to_cpu(h->flags);
734 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
736 h->flags = cpu_to_le16(val);
739 static inline int btrfs_header_level(struct btrfs_header *h)
744 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
746 BUG_ON(level > BTRFS_MAX_LEVEL);
750 static inline int btrfs_is_leaf(struct btrfs_node *n)
752 return (btrfs_header_level(&n->header) == 0);
755 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
757 return le64_to_cpu(item->blocknr);
760 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
762 item->blocknr = cpu_to_le64(val);
765 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
767 return le64_to_cpu(item->root_dirid);
770 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
772 item->root_dirid = cpu_to_le64(val);
775 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
777 return le32_to_cpu(item->refs);
780 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
782 item->refs = cpu_to_le32(val);
785 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
787 return le64_to_cpu(s->blocknr);
790 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
792 s->blocknr = cpu_to_le64(val);
795 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
797 return le64_to_cpu(s->generation);
800 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
803 s->generation = cpu_to_le64(val);
806 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
808 return le64_to_cpu(s->root);
811 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
813 s->root = cpu_to_le64(val);
816 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
818 return le64_to_cpu(s->total_blocks);
821 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
824 s->total_blocks = cpu_to_le64(val);
827 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
829 return le64_to_cpu(s->blocks_used);
832 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
835 s->blocks_used = cpu_to_le64(val);
838 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
840 return le32_to_cpu(s->blocksize);
843 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
846 s->blocksize = cpu_to_le32(val);
849 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
851 return le64_to_cpu(s->root_dir_objectid);
854 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
857 s->root_dir_objectid = cpu_to_le64(val);
860 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
862 return le64_to_cpu(s->last_device_id);
865 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
868 s->last_device_id = cpu_to_le64(val);
871 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
873 return le64_to_cpu(s->device_id);
876 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
879 s->device_id = cpu_to_le64(val);
882 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
884 return le64_to_cpu(s->device_block_start);
887 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
890 s->device_block_start = cpu_to_le64(val);
893 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
895 return le64_to_cpu(s->device_num_blocks);
898 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
901 s->device_num_blocks = cpu_to_le64(val);
904 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
906 return le64_to_cpu(s->device_root);
909 static inline void btrfs_set_super_device_root(struct btrfs_super_block
912 s->device_root = cpu_to_le64(val);
916 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
918 return (u8 *)l->items;
921 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
925 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
931 static inline char *btrfs_file_extent_inline_start(struct
932 btrfs_file_extent_item *e)
934 return (char *)(&e->disk_blocknr);
937 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
939 return (unsigned long)(&((struct
940 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
943 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
945 struct btrfs_file_extent_item *fe = NULL;
946 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
949 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
952 return le64_to_cpu(e->disk_blocknr);
955 static inline void btrfs_set_file_extent_disk_blocknr(struct
956 btrfs_file_extent_item
959 e->disk_blocknr = cpu_to_le64(val);
962 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
964 return le64_to_cpu(e->generation);
967 static inline void btrfs_set_file_extent_generation(struct
968 btrfs_file_extent_item *e,
971 e->generation = cpu_to_le64(val);
974 static inline u64 btrfs_file_extent_disk_num_blocks(struct
975 btrfs_file_extent_item *e)
977 return le64_to_cpu(e->disk_num_blocks);
980 static inline void btrfs_set_file_extent_disk_num_blocks(struct
981 btrfs_file_extent_item
984 e->disk_num_blocks = cpu_to_le64(val);
987 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
989 return le64_to_cpu(e->offset);
992 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
995 e->offset = cpu_to_le64(val);
998 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
1001 return le64_to_cpu(e->num_blocks);
1004 static inline void btrfs_set_file_extent_num_blocks(struct
1005 btrfs_file_extent_item *e,
1008 e->num_blocks = cpu_to_le64(val);
1011 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
1013 return le16_to_cpu(d->pathlen);
1016 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
1019 d->pathlen = cpu_to_le16(val);
1022 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
1024 return le64_to_cpu(d->device_id);
1027 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
1030 d->device_id = cpu_to_le64(val);
1033 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1035 return sb->s_fs_info;
1038 static inline void btrfs_check_bounds(void *vptr, size_t len,
1039 void *vcontainer, size_t container_len)
1042 char *container = vcontainer;
1043 WARN_ON(ptr < container);
1044 WARN_ON(ptr + len > container + container_len);
1047 static inline void btrfs_memcpy(struct btrfs_root *root,
1049 void *dst, const void *src, size_t nr)
1051 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1052 memcpy(dst, src, nr);
1055 static inline void btrfs_memmove(struct btrfs_root *root,
1057 void *dst, void *src, size_t nr)
1059 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1060 memmove(dst, src, nr);
1063 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1065 WARN_ON(!atomic_read(&bh->b_count));
1066 mark_buffer_dirty(bh);
1069 /* helper function to cast into the data area of the leaf. */
1070 #define btrfs_item_ptr(leaf, slot, type) \
1071 ((type *)(btrfs_leaf_data(leaf) + \
1072 btrfs_item_offset((leaf)->items + (slot))))
1075 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1076 struct btrfs_block_group_cache
1077 *hint, u64 search_start,
1079 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1080 struct btrfs_root *root);
1081 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1082 struct btrfs_root *root, u64 hint);
1083 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1084 struct btrfs_root *root, u64 owner,
1085 u64 num_blocks, u64 search_start,
1086 u64 search_end, struct btrfs_key *ins, int data);
1087 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1088 struct buffer_head *buf);
1089 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1090 *root, u64 blocknr, u64 num_blocks, int pin);
1091 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1093 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1094 struct btrfs_root *root,
1095 u64 blocknr, u64 num_blocks);
1096 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1097 struct btrfs_root *root);
1098 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1099 int btrfs_read_block_groups(struct btrfs_root *root);
1101 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1102 *root, struct btrfs_path *path, u32 data_size);
1103 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1104 struct btrfs_root *root,
1105 struct btrfs_path *path,
1107 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1108 *root, struct btrfs_key *key, struct btrfs_path *p, int
1110 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1111 struct btrfs_path *btrfs_alloc_path(void);
1112 void btrfs_free_path(struct btrfs_path *p);
1113 void btrfs_init_path(struct btrfs_path *p);
1114 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1115 struct btrfs_path *path);
1116 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1117 *root, struct btrfs_key *key, void *data, u32 data_size);
1118 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1119 *root, struct btrfs_path *path, struct btrfs_key
1120 *cpu_key, u32 data_size);
1121 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1122 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1123 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1124 *root, struct buffer_head *snap);
1126 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1127 struct btrfs_key *key);
1128 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1129 *root, struct btrfs_key *key, struct btrfs_root_item
1131 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1132 *root, struct btrfs_key *key, struct btrfs_root_item
1134 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1135 btrfs_root_item *item, struct btrfs_key *key);
1137 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1138 *root, const char *name, int name_len, u64 dir,
1139 struct btrfs_key *location, u8 type);
1140 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1141 struct btrfs_root *root,
1142 struct btrfs_path *path, u64 dir,
1143 const char *name, int name_len,
1145 struct btrfs_dir_item *
1146 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1147 struct btrfs_root *root,
1148 struct btrfs_path *path, u64 dir,
1149 u64 objectid, const char *name, int name_len,
1151 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1152 struct btrfs_path *path,
1153 const char *name, int name_len);
1154 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1155 struct btrfs_root *root,
1156 struct btrfs_path *path,
1157 struct btrfs_dir_item *di);
1159 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1160 struct btrfs_root *fs_root,
1161 u64 dirid, u64 *objectid);
1162 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1165 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1166 *root, u64 objectid, struct btrfs_inode_item
1168 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1169 *root, struct btrfs_path *path,
1170 struct btrfs_key *location, int mod);
1173 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1174 struct btrfs_root *root,
1175 u64 objectid, u64 pos, u64 offset,
1177 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1178 struct btrfs_root *root,
1179 struct btrfs_path *path, u64 objectid,
1180 u64 blocknr, int mod);
1181 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1182 struct btrfs_root *root,
1183 u64 objectid, u64 offset,
1184 char *data, size_t len);
1185 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1186 u64 objectid, u64 offset,
1187 char *data, size_t len);
1188 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1189 struct btrfs_root *root,
1190 struct btrfs_path *path,
1191 u64 objectid, u64 offset,
1194 extern struct subsystem btrfs_subsys;