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;
258 struct radix_tree_root *radix;
268 struct btrfs_fs_info {
269 struct btrfs_root *extent_root;
270 struct btrfs_root *tree_root;
271 struct btrfs_root *dev_root;
272 struct radix_tree_root fs_roots_radix;
273 struct radix_tree_root pending_del_radix;
274 struct radix_tree_root pinned_radix;
275 struct radix_tree_root dev_radix;
276 struct radix_tree_root block_group_radix;
277 struct radix_tree_root block_group_data_radix;
278 struct radix_tree_root extent_map_radix;
280 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
281 int extent_tree_insert_nr;
282 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
283 int extent_tree_prealloc_nr;
286 struct btrfs_transaction *running_transaction;
287 struct btrfs_super_block *disk_super;
288 struct buffer_head *sb_buffer;
289 struct super_block *sb;
290 struct inode *btree_inode;
291 struct mutex trans_mutex;
292 struct mutex fs_mutex;
293 struct list_head trans_list;
294 struct crypto_hash *hash_tfm;
295 spinlock_t hash_lock;
301 * in ram representation of the tree. extent_root is used for all allocations
302 * and for the extent tree extent_root root.
305 struct buffer_head *node;
306 struct buffer_head *commit_root;
307 struct btrfs_root_item root_item;
308 struct btrfs_key root_key;
309 struct btrfs_fs_info *fs_info;
317 u64 last_inode_alloc;
320 /* the lower bits in the key flags defines the item type */
321 #define BTRFS_KEY_TYPE_MAX 256
322 #define BTRFS_KEY_TYPE_SHIFT 24
323 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
324 BTRFS_KEY_TYPE_SHIFT)
327 * inode items have the data typically returned from stat and store other
328 * info about object characteristics. There is one for every file and dir in
331 #define BTRFS_INODE_ITEM_KEY 1
333 /* reserve 2-15 close to the inode for later flexibility */
336 * dir items are the name -> inode pointers in a directory. There is one
337 * for every name in a directory.
339 #define BTRFS_DIR_ITEM_KEY 16
340 #define BTRFS_DIR_INDEX_KEY 17
342 * extent data is for file data
344 #define BTRFS_EXTENT_DATA_KEY 18
346 * csum items have the checksums for data in the extents
348 #define BTRFS_CSUM_ITEM_KEY 19
350 /* reserve 20-31 for other file stuff */
353 * root items point to tree roots. There are typically in the root
354 * tree used by the super block to find all the other trees
356 #define BTRFS_ROOT_ITEM_KEY 32
358 * extent items are in the extent map tree. These record which blocks
359 * are used, and how many references there are to each block
361 #define BTRFS_EXTENT_ITEM_KEY 33
364 * block groups give us hints into the extent allocation trees. Which
365 * blocks are free etc etc
367 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
370 * dev items list the devices that make up the FS
372 #define BTRFS_DEV_ITEM_KEY 35
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 u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
866 return le64_to_cpu(s->last_device_id);
869 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
872 s->last_device_id = cpu_to_le64(val);
875 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
877 return le64_to_cpu(s->device_id);
880 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
883 s->device_id = cpu_to_le64(val);
886 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
888 return le64_to_cpu(s->device_block_start);
891 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
894 s->device_block_start = cpu_to_le64(val);
897 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
899 return le64_to_cpu(s->device_num_blocks);
902 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
905 s->device_num_blocks = cpu_to_le64(val);
908 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
910 return le64_to_cpu(s->device_root);
913 static inline void btrfs_set_super_device_root(struct btrfs_super_block
916 s->device_root = cpu_to_le64(val);
920 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
922 return (u8 *)l->items;
925 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
929 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
935 static inline char *btrfs_file_extent_inline_start(struct
936 btrfs_file_extent_item *e)
938 return (char *)(&e->disk_blocknr);
941 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
943 return (unsigned long)(&((struct
944 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
947 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
949 struct btrfs_file_extent_item *fe = NULL;
950 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
953 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
956 return le64_to_cpu(e->disk_blocknr);
959 static inline void btrfs_set_file_extent_disk_blocknr(struct
960 btrfs_file_extent_item
963 e->disk_blocknr = cpu_to_le64(val);
966 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
968 return le64_to_cpu(e->generation);
971 static inline void btrfs_set_file_extent_generation(struct
972 btrfs_file_extent_item *e,
975 e->generation = cpu_to_le64(val);
978 static inline u64 btrfs_file_extent_disk_num_blocks(struct
979 btrfs_file_extent_item *e)
981 return le64_to_cpu(e->disk_num_blocks);
984 static inline void btrfs_set_file_extent_disk_num_blocks(struct
985 btrfs_file_extent_item
988 e->disk_num_blocks = cpu_to_le64(val);
991 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
993 return le64_to_cpu(e->offset);
996 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
999 e->offset = cpu_to_le64(val);
1002 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
1005 return le64_to_cpu(e->num_blocks);
1008 static inline void btrfs_set_file_extent_num_blocks(struct
1009 btrfs_file_extent_item *e,
1012 e->num_blocks = cpu_to_le64(val);
1015 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
1017 return le16_to_cpu(d->pathlen);
1020 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
1023 d->pathlen = cpu_to_le16(val);
1026 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
1028 return le64_to_cpu(d->device_id);
1031 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
1034 d->device_id = cpu_to_le64(val);
1037 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1039 return sb->s_fs_info;
1042 static inline void btrfs_check_bounds(void *vptr, size_t len,
1043 void *vcontainer, size_t container_len)
1046 char *container = vcontainer;
1047 WARN_ON(ptr < container);
1048 WARN_ON(ptr + len > container + container_len);
1051 static inline void btrfs_memcpy(struct btrfs_root *root,
1053 void *dst, const void *src, size_t nr)
1055 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1056 memcpy(dst, src, nr);
1059 static inline void btrfs_memmove(struct btrfs_root *root,
1061 void *dst, void *src, size_t nr)
1063 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1064 memmove(dst, src, nr);
1067 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1069 WARN_ON(!atomic_read(&bh->b_count));
1070 mark_buffer_dirty(bh);
1073 /* helper function to cast into the data area of the leaf. */
1074 #define btrfs_item_ptr(leaf, slot, type) \
1075 ((type *)(btrfs_leaf_data(leaf) + \
1076 btrfs_item_offset((leaf)->items + (slot))))
1079 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1080 struct btrfs_block_group_cache
1081 *hint, u64 search_start,
1083 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1084 struct btrfs_root *root);
1085 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1086 struct btrfs_root *root, u64 hint);
1087 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1088 struct btrfs_root *root, u64 owner,
1089 u64 num_blocks, u64 search_start,
1090 u64 search_end, struct btrfs_key *ins, int data);
1091 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1092 struct buffer_head *buf);
1093 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1094 *root, u64 blocknr, u64 num_blocks, int pin);
1095 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1097 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1098 struct btrfs_root *root,
1099 u64 blocknr, u64 num_blocks);
1100 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1101 struct btrfs_root *root);
1102 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1103 int btrfs_read_block_groups(struct btrfs_root *root);
1105 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1106 *root, struct btrfs_path *path, u32 data_size);
1107 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1108 struct btrfs_root *root,
1109 struct btrfs_path *path,
1111 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1112 *root, struct btrfs_key *key, struct btrfs_path *p, int
1114 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1115 struct btrfs_path *btrfs_alloc_path(void);
1116 void btrfs_free_path(struct btrfs_path *p);
1117 void btrfs_init_path(struct btrfs_path *p);
1118 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1119 struct btrfs_path *path);
1120 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1121 *root, struct btrfs_key *key, void *data, u32 data_size);
1122 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1123 *root, struct btrfs_path *path, struct btrfs_key
1124 *cpu_key, u32 data_size);
1125 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1126 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1127 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1128 *root, struct buffer_head *snap);
1130 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1131 struct btrfs_key *key);
1132 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1133 *root, struct btrfs_key *key, struct btrfs_root_item
1135 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1136 *root, struct btrfs_key *key, struct btrfs_root_item
1138 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1139 btrfs_root_item *item, struct btrfs_key *key);
1141 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1142 *root, const char *name, int name_len, u64 dir,
1143 struct btrfs_key *location, u8 type);
1144 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1145 struct btrfs_root *root,
1146 struct btrfs_path *path, u64 dir,
1147 const char *name, int name_len,
1149 struct btrfs_dir_item *
1150 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1151 struct btrfs_root *root,
1152 struct btrfs_path *path, u64 dir,
1153 u64 objectid, const char *name, int name_len,
1155 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1156 struct btrfs_path *path,
1157 const char *name, int name_len);
1158 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1159 struct btrfs_root *root,
1160 struct btrfs_path *path,
1161 struct btrfs_dir_item *di);
1163 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1164 struct btrfs_root *fs_root,
1165 u64 dirid, u64 *objectid);
1166 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1169 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1170 *root, u64 objectid, struct btrfs_inode_item
1172 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1173 *root, struct btrfs_path *path,
1174 struct btrfs_key *location, int mod);
1177 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1178 struct btrfs_root *root,
1179 u64 objectid, u64 pos, u64 offset,
1181 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1182 struct btrfs_root *root,
1183 struct btrfs_path *path, u64 objectid,
1184 u64 blocknr, int mod);
1185 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1186 struct btrfs_root *root,
1187 u64 objectid, u64 offset,
1188 char *data, size_t len);
1189 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1190 u64 objectid, u64 offset,
1191 char *data, size_t len);
1192 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1193 struct btrfs_root *root,
1194 struct btrfs_path *path,
1195 u64 objectid, u64 offset,
1198 extern struct subsystem btrfs_subsys;