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))
76 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
77 sizeof(struct btrfs_item) - \
78 sizeof(struct btrfs_file_extent_item))
82 * the super block basically lists the main trees of the FS
83 * it currently lacks any block count etc etc
85 struct btrfs_super_block {
86 u8 csum[BTRFS_CSUM_SIZE];
87 /* the first 3 fields must match struct btrfs_header */
88 u8 fsid[16]; /* FS specific uuid */
89 __le64 blocknr; /* this block number */
96 __le64 root_dir_objectid;
97 __le64 last_device_id;
98 /* fields below here vary with the underlying disk */
99 __le64 device_block_start;
100 __le64 device_num_blocks;
103 } __attribute__ ((__packed__));
106 * A leaf is full of items. offset and size tell us where to find
107 * the item in the leaf (relative to the start of the data area)
110 struct btrfs_disk_key key;
113 } __attribute__ ((__packed__));
116 * leaves have an item area and a data area:
117 * [item0, item1....itemN] [free space] [dataN...data1, data0]
119 * The data is separate from the items to get the keys closer together
123 struct btrfs_header header;
124 struct btrfs_item items[];
125 } __attribute__ ((__packed__));
128 * all non-leaf blocks are nodes, they hold only keys and pointers to
131 struct btrfs_key_ptr {
132 struct btrfs_disk_key key;
134 } __attribute__ ((__packed__));
137 struct btrfs_header header;
138 struct btrfs_key_ptr ptrs[];
139 } __attribute__ ((__packed__));
142 * btrfs_paths remember the path taken from the root down to the leaf.
143 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
144 * to any other levels that are present.
146 * The slots array records the index of the item or block pointer
147 * used while walking the tree.
150 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
151 int slots[BTRFS_MAX_LEVEL];
155 * items in the extent btree are used to record the objectid of the
156 * owner of the block and the number of references
158 struct btrfs_extent_item {
160 } __attribute__ ((__packed__));
162 struct btrfs_inode_timespec {
165 } __attribute__ ((__packed__));
168 * there is no padding here on purpose. If you want to extent the inode,
169 * make a new item type
171 struct btrfs_inode_item {
182 struct btrfs_inode_timespec atime;
183 struct btrfs_inode_timespec ctime;
184 struct btrfs_inode_timespec mtime;
185 struct btrfs_inode_timespec otime;
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 #define BTRFS_FILE_EXTENT_REG 0
206 #define BTRFS_FILE_EXTENT_INLINE 1
208 struct btrfs_file_extent_item {
212 * disk space consumed by the extent, checksum blocks are included
216 __le64 disk_num_blocks;
218 * the logical offset in file blocks (no csums)
219 * this extent record is for. This allows a file extent to point
220 * into the middle of an existing extent on disk, sharing it
221 * between two snapshots (useful if some bytes in the middle of the
222 * extent have changed
226 * the logical number of file blocks (no csums included)
229 } __attribute__ ((__packed__));
231 struct btrfs_csum_item {
232 u8 csum[BTRFS_CSUM_SIZE];
233 } __attribute__ ((__packed__));
235 struct btrfs_device_item {
238 } __attribute__ ((__packed__));
241 struct btrfs_fs_info {
242 struct btrfs_root *extent_root;
243 struct btrfs_root *tree_root;
244 struct btrfs_root *dev_root;
245 struct btrfs_key current_insert;
246 struct btrfs_key last_insert;
247 struct radix_tree_root fs_roots_radix;
248 struct radix_tree_root pending_del_radix;
249 struct radix_tree_root pinned_radix;
250 struct radix_tree_root dev_radix;
252 struct btrfs_transaction *running_transaction;
253 struct btrfs_super_block *disk_super;
254 struct buffer_head *sb_buffer;
255 struct super_block *sb;
256 struct inode *btree_inode;
257 struct mutex trans_mutex;
258 struct mutex fs_mutex;
259 struct list_head trans_list;
260 struct crypto_hash *hash_tfm;
261 spinlock_t hash_lock;
266 * in ram representation of the tree. extent_root is used for all allocations
267 * and for the extent tree extent_root root. current_insert is used
268 * only for the extent tree.
271 struct buffer_head *node;
272 struct buffer_head *commit_root;
273 struct btrfs_root_item root_item;
274 struct btrfs_key root_key;
275 struct btrfs_fs_info *fs_info;
283 u64 last_inode_alloc;
286 /* the lower bits in the key flags defines the item type */
287 #define BTRFS_KEY_TYPE_MAX 256
288 #define BTRFS_KEY_TYPE_SHIFT 24
289 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
290 BTRFS_KEY_TYPE_SHIFT)
293 * inode items have the data typically returned from stat and store other
294 * info about object characteristics. There is one for every file and dir in
297 #define BTRFS_INODE_ITEM_KEY 1
300 * dir items are the name -> inode pointers in a directory. There is one
301 * for every name in a directory.
303 #define BTRFS_DIR_ITEM_KEY 2
304 #define BTRFS_DIR_INDEX_KEY 3
306 * inline data is file data that fits in the btree.
308 #define BTRFS_INLINE_DATA_KEY 4
310 * extent data is for data that can't fit in the btree. It points to
311 * a (hopefully) huge chunk of disk
313 #define BTRFS_EXTENT_DATA_KEY 5
315 * csum items have the checksums for data in the extents
317 #define BTRFS_CSUM_ITEM_KEY 6
320 * root items point to tree roots. There are typically in the root
321 * tree used by the super block to find all the other trees
323 #define BTRFS_ROOT_ITEM_KEY 7
325 * extent items are in the extent map tree. These record which blocks
326 * are used, and how many references there are to each block
328 #define BTRFS_EXTENT_ITEM_KEY 8
331 * dev items list the devices that make up the FS
333 #define BTRFS_DEV_ITEM_KEY 9
336 * string items are for debugging. They just store a short string of
339 #define BTRFS_STRING_ITEM_KEY 10
341 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
343 return le64_to_cpu(i->generation);
346 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
349 i->generation = cpu_to_le64(val);
352 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
354 return le64_to_cpu(i->size);
357 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
359 i->size = cpu_to_le64(val);
362 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
364 return le64_to_cpu(i->nblocks);
367 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
369 i->nblocks = cpu_to_le64(val);
372 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
374 return le32_to_cpu(i->nlink);
377 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
379 i->nlink = cpu_to_le32(val);
382 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
384 return le32_to_cpu(i->uid);
387 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
389 i->uid = cpu_to_le32(val);
392 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
394 return le32_to_cpu(i->gid);
397 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
399 i->gid = cpu_to_le32(val);
402 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
404 return le32_to_cpu(i->mode);
407 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
409 i->mode = cpu_to_le32(val);
412 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
414 return le32_to_cpu(i->rdev);
417 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
419 i->rdev = cpu_to_le32(val);
422 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
424 return le16_to_cpu(i->flags);
427 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
429 i->flags = cpu_to_le16(val);
432 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
434 return le16_to_cpu(i->compat_flags);
437 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
440 i->compat_flags = cpu_to_le16(val);
443 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
445 return le64_to_cpu(ts->sec);
448 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
451 ts->sec = cpu_to_le64(val);
454 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
456 return le32_to_cpu(ts->nsec);
459 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
462 ts->nsec = cpu_to_le32(val);
465 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
467 return le32_to_cpu(ei->refs);
470 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
472 ei->refs = cpu_to_le32(val);
475 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
477 return le64_to_cpu(n->ptrs[nr].blockptr);
480 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
483 n->ptrs[nr].blockptr = cpu_to_le64(val);
486 static inline u32 btrfs_item_offset(struct btrfs_item *item)
488 return le32_to_cpu(item->offset);
491 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
493 item->offset = cpu_to_le32(val);
496 static inline u32 btrfs_item_end(struct btrfs_item *item)
498 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
501 static inline u16 btrfs_item_size(struct btrfs_item *item)
503 return le16_to_cpu(item->size);
506 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
508 item->size = cpu_to_le16(val);
511 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
513 return le16_to_cpu(d->flags);
516 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
518 d->flags = cpu_to_le16(val);
521 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
526 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
531 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
533 return le16_to_cpu(d->name_len);
536 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
538 d->name_len = cpu_to_le16(val);
541 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
542 struct btrfs_disk_key *disk)
544 cpu->offset = le64_to_cpu(disk->offset);
545 cpu->flags = le32_to_cpu(disk->flags);
546 cpu->objectid = le64_to_cpu(disk->objectid);
549 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
550 struct btrfs_key *cpu)
552 disk->offset = cpu_to_le64(cpu->offset);
553 disk->flags = cpu_to_le32(cpu->flags);
554 disk->objectid = cpu_to_le64(cpu->objectid);
557 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
559 return le64_to_cpu(disk->objectid);
562 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
565 disk->objectid = cpu_to_le64(val);
568 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
570 return le64_to_cpu(disk->offset);
573 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
576 disk->offset = cpu_to_le64(val);
579 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
581 return le32_to_cpu(disk->flags);
584 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
587 disk->flags = cpu_to_le32(val);
590 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
592 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
595 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
598 u32 flags = btrfs_disk_key_flags(key);
599 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
600 val = val << BTRFS_KEY_TYPE_SHIFT;
601 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
602 btrfs_set_disk_key_flags(key, flags);
605 static inline u32 btrfs_key_type(struct btrfs_key *key)
607 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
610 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
612 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
613 val = val << BTRFS_KEY_TYPE_SHIFT;
614 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
617 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
619 return le64_to_cpu(h->blocknr);
622 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
624 h->blocknr = cpu_to_le64(blocknr);
627 static inline u64 btrfs_header_generation(struct btrfs_header *h)
629 return le64_to_cpu(h->generation);
632 static inline void btrfs_set_header_generation(struct btrfs_header *h,
635 h->generation = cpu_to_le64(val);
638 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
640 return le16_to_cpu(h->nritems);
643 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
645 h->nritems = cpu_to_le16(val);
648 static inline u16 btrfs_header_flags(struct btrfs_header *h)
650 return le16_to_cpu(h->flags);
653 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
655 h->flags = cpu_to_le16(val);
658 static inline int btrfs_header_level(struct btrfs_header *h)
663 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
665 BUG_ON(level > BTRFS_MAX_LEVEL);
669 static inline int btrfs_is_leaf(struct btrfs_node *n)
671 return (btrfs_header_level(&n->header) == 0);
674 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
676 return le64_to_cpu(item->blocknr);
679 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
681 item->blocknr = cpu_to_le64(val);
684 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
686 return le64_to_cpu(item->root_dirid);
689 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
691 item->root_dirid = cpu_to_le64(val);
694 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
696 return le32_to_cpu(item->refs);
699 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
701 item->refs = cpu_to_le32(val);
704 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
706 return le64_to_cpu(s->blocknr);
709 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
711 s->blocknr = cpu_to_le64(val);
714 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
716 return le64_to_cpu(s->generation);
719 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
722 s->generation = cpu_to_le64(val);
725 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
727 return le64_to_cpu(s->root);
730 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
732 s->root = cpu_to_le64(val);
735 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
737 return le64_to_cpu(s->total_blocks);
740 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
743 s->total_blocks = cpu_to_le64(val);
746 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
748 return le64_to_cpu(s->blocks_used);
751 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
754 s->blocks_used = cpu_to_le64(val);
757 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
759 return le32_to_cpu(s->blocksize);
762 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
765 s->blocksize = cpu_to_le32(val);
768 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
770 return le64_to_cpu(s->root_dir_objectid);
773 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
776 s->root_dir_objectid = cpu_to_le64(val);
779 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
781 return le64_to_cpu(s->last_device_id);
784 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
787 s->last_device_id = cpu_to_le64(val);
790 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
792 return le64_to_cpu(s->device_id);
795 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
798 s->device_id = 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 int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
844 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
850 static inline char *btrfs_file_extent_inline_start(struct
851 btrfs_file_extent_item *e)
853 return (char *)(&e->disk_blocknr);
856 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
858 return (unsigned long)(&((struct
859 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
862 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
864 struct btrfs_file_extent_item *fe = NULL;
865 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
868 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
871 return le64_to_cpu(e->disk_blocknr);
874 static inline void btrfs_set_file_extent_disk_blocknr(struct
875 btrfs_file_extent_item
878 e->disk_blocknr = cpu_to_le64(val);
881 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
883 return le64_to_cpu(e->generation);
886 static inline void btrfs_set_file_extent_generation(struct
887 btrfs_file_extent_item *e,
890 e->generation = cpu_to_le64(val);
893 static inline u64 btrfs_file_extent_disk_num_blocks(struct
894 btrfs_file_extent_item *e)
896 return le64_to_cpu(e->disk_num_blocks);
899 static inline void btrfs_set_file_extent_disk_num_blocks(struct
900 btrfs_file_extent_item
903 e->disk_num_blocks = cpu_to_le64(val);
906 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
908 return le64_to_cpu(e->offset);
911 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
914 e->offset = cpu_to_le64(val);
917 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
920 return le64_to_cpu(e->num_blocks);
923 static inline void btrfs_set_file_extent_num_blocks(struct
924 btrfs_file_extent_item *e,
927 e->num_blocks = cpu_to_le64(val);
930 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
932 return le16_to_cpu(d->pathlen);
935 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
938 d->pathlen = cpu_to_le16(val);
941 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
943 return le64_to_cpu(d->device_id);
946 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
949 d->device_id = cpu_to_le64(val);
952 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
954 return sb->s_fs_info;
957 static inline void btrfs_check_bounds(void *vptr, size_t len,
958 void *vcontainer, size_t container_len)
961 char *container = vcontainer;
962 WARN_ON(ptr < container);
963 WARN_ON(ptr + len > container + container_len);
966 static inline void btrfs_memcpy(struct btrfs_root *root,
968 void *dst, const void *src, size_t nr)
970 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
971 memcpy(dst, src, nr);
974 static inline void btrfs_memmove(struct btrfs_root *root,
976 void *dst, void *src, size_t nr)
978 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
979 memmove(dst, src, nr);
982 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
984 WARN_ON(!atomic_read(&bh->b_count));
985 mark_buffer_dirty(bh);
988 /* helper function to cast into the data area of the leaf. */
989 #define btrfs_item_ptr(leaf, slot, type) \
990 ((type *)(btrfs_leaf_data(leaf) + \
991 btrfs_item_offset((leaf)->items + (slot))))
994 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
995 struct btrfs_root *root);
996 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
997 struct btrfs_root *root);
998 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
999 *root, u64 num_blocks, u64 search_start, u64
1000 search_end, struct btrfs_key *ins);
1001 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1002 struct buffer_head *buf);
1003 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1004 *root, u64 blocknr, u64 num_blocks, int pin);
1005 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1007 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1008 struct btrfs_root *root,
1009 u64 blocknr, u64 num_blocks);
1011 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1012 *root, struct btrfs_path *path, u32 data_size);
1013 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1014 struct btrfs_root *root,
1015 struct btrfs_path *path,
1017 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1018 *root, struct btrfs_key *key, struct btrfs_path *p, int
1020 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1021 struct btrfs_path *btrfs_alloc_path(void);
1022 void btrfs_free_path(struct btrfs_path *p);
1023 void btrfs_init_path(struct btrfs_path *p);
1024 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1025 struct btrfs_path *path);
1026 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1027 *root, struct btrfs_key *key, void *data, u32 data_size);
1028 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1029 *root, struct btrfs_path *path, struct btrfs_key
1030 *cpu_key, u32 data_size);
1031 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1032 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1033 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1034 *root, struct buffer_head *snap);
1036 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1037 struct btrfs_key *key);
1038 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1039 *root, struct btrfs_key *key, struct btrfs_root_item
1041 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1042 *root, struct btrfs_key *key, struct btrfs_root_item
1044 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1045 btrfs_root_item *item, struct btrfs_key *key);
1047 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1048 *root, const char *name, int name_len, u64 dir,
1049 struct btrfs_key *location, u8 type);
1050 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1051 struct btrfs_root *root,
1052 struct btrfs_path *path, u64 dir,
1053 const char *name, int name_len,
1055 struct btrfs_dir_item *
1056 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1057 struct btrfs_root *root,
1058 struct btrfs_path *path, u64 dir,
1059 u64 objectid, const char *name, int name_len,
1061 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1062 struct btrfs_path *path,
1063 const char *name, int name_len);
1064 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1065 struct btrfs_root *root,
1066 struct btrfs_path *path,
1067 struct btrfs_dir_item *di);
1069 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1070 struct btrfs_root *fs_root,
1071 u64 dirid, u64 *objectid);
1072 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1075 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1076 *root, u64 objectid, struct btrfs_inode_item
1078 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1079 *root, struct btrfs_path *path,
1080 struct btrfs_key *location, int mod);
1083 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1084 struct btrfs_root *root,
1085 u64 objectid, u64 pos, u64 offset,
1087 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1088 struct btrfs_root *root,
1089 struct btrfs_path *path, u64 objectid,
1090 u64 blocknr, int mod);
1091 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1092 struct btrfs_root *root,
1093 u64 objectid, u64 offset,
1094 char *data, size_t len);
1095 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1096 u64 objectid, u64 offset,
1097 char *data, size_t len);
1098 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1099 struct btrfs_root *root,
1100 struct btrfs_path *path,
1101 u64 objectid, u64 offset,
1104 extern struct subsystem btrfs_subsys;