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 crypto_hash *hash_tfm;
260 spinlock_t hash_lock;
265 * in ram representation of the tree. extent_root is used for all allocations
266 * and for the extent tree extent_root root. current_insert is used
267 * only for the extent tree.
270 struct buffer_head *node;
271 struct buffer_head *commit_root;
272 struct btrfs_root_item root_item;
273 struct btrfs_key root_key;
274 struct btrfs_fs_info *fs_info;
282 u64 last_inode_alloc;
285 /* the lower bits in the key flags defines the item type */
286 #define BTRFS_KEY_TYPE_MAX 256
287 #define BTRFS_KEY_TYPE_SHIFT 24
288 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
289 BTRFS_KEY_TYPE_SHIFT)
292 * inode items have the data typically returned from stat and store other
293 * info about object characteristics. There is one for every file and dir in
296 #define BTRFS_INODE_ITEM_KEY 1
299 * dir items are the name -> inode pointers in a directory. There is one
300 * for every name in a directory.
302 #define BTRFS_DIR_ITEM_KEY 2
303 #define BTRFS_DIR_INDEX_KEY 3
305 * inline data is file data that fits in the btree.
307 #define BTRFS_INLINE_DATA_KEY 4
309 * extent data is for data that can't fit in the btree. It points to
310 * a (hopefully) huge chunk of disk
312 #define BTRFS_EXTENT_DATA_KEY 5
314 * csum items have the checksums for data in the extents
316 #define BTRFS_CSUM_ITEM_KEY 6
319 * root items point to tree roots. There are typically in the root
320 * tree used by the super block to find all the other trees
322 #define BTRFS_ROOT_ITEM_KEY 7
324 * extent items are in the extent map tree. These record which blocks
325 * are used, and how many references there are to each block
327 #define BTRFS_EXTENT_ITEM_KEY 8
330 * dev items list the devices that make up the FS
332 #define BTRFS_DEV_ITEM_KEY 9
335 * string items are for debugging. They just store a short string of
338 #define BTRFS_STRING_ITEM_KEY 10
340 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
342 return le64_to_cpu(i->generation);
345 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
348 i->generation = cpu_to_le64(val);
351 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
353 return le64_to_cpu(i->size);
356 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
358 i->size = cpu_to_le64(val);
361 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
363 return le64_to_cpu(i->nblocks);
366 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
368 i->nblocks = cpu_to_le64(val);
371 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
373 return le32_to_cpu(i->nlink);
376 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
378 i->nlink = cpu_to_le32(val);
381 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
383 return le32_to_cpu(i->uid);
386 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
388 i->uid = cpu_to_le32(val);
391 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
393 return le32_to_cpu(i->gid);
396 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
398 i->gid = cpu_to_le32(val);
401 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
403 return le32_to_cpu(i->mode);
406 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
408 i->mode = cpu_to_le32(val);
411 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
413 return le32_to_cpu(i->rdev);
416 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
418 i->rdev = cpu_to_le32(val);
421 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
423 return le16_to_cpu(i->flags);
426 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
428 i->flags = cpu_to_le16(val);
431 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
433 return le16_to_cpu(i->compat_flags);
436 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
439 i->compat_flags = cpu_to_le16(val);
442 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
444 return le64_to_cpu(ts->sec);
447 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
450 ts->sec = cpu_to_le64(val);
453 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
455 return le32_to_cpu(ts->nsec);
458 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
461 ts->nsec = cpu_to_le32(val);
464 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
466 return le32_to_cpu(ei->refs);
469 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
471 ei->refs = cpu_to_le32(val);
474 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
476 return le64_to_cpu(n->ptrs[nr].blockptr);
479 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
482 n->ptrs[nr].blockptr = cpu_to_le64(val);
485 static inline u32 btrfs_item_offset(struct btrfs_item *item)
487 return le32_to_cpu(item->offset);
490 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
492 item->offset = cpu_to_le32(val);
495 static inline u32 btrfs_item_end(struct btrfs_item *item)
497 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
500 static inline u16 btrfs_item_size(struct btrfs_item *item)
502 return le16_to_cpu(item->size);
505 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
507 item->size = cpu_to_le16(val);
510 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
512 return le16_to_cpu(d->flags);
515 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
517 d->flags = cpu_to_le16(val);
520 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
525 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
530 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
532 return le16_to_cpu(d->name_len);
535 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
537 d->name_len = cpu_to_le16(val);
540 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
541 struct btrfs_disk_key *disk)
543 cpu->offset = le64_to_cpu(disk->offset);
544 cpu->flags = le32_to_cpu(disk->flags);
545 cpu->objectid = le64_to_cpu(disk->objectid);
548 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
549 struct btrfs_key *cpu)
551 disk->offset = cpu_to_le64(cpu->offset);
552 disk->flags = cpu_to_le32(cpu->flags);
553 disk->objectid = cpu_to_le64(cpu->objectid);
556 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
558 return le64_to_cpu(disk->objectid);
561 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
564 disk->objectid = cpu_to_le64(val);
567 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
569 return le64_to_cpu(disk->offset);
572 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
575 disk->offset = cpu_to_le64(val);
578 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
580 return le32_to_cpu(disk->flags);
583 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
586 disk->flags = cpu_to_le32(val);
589 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
591 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
594 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
597 u32 flags = btrfs_disk_key_flags(key);
598 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
599 val = val << BTRFS_KEY_TYPE_SHIFT;
600 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
601 btrfs_set_disk_key_flags(key, flags);
604 static inline u32 btrfs_key_type(struct btrfs_key *key)
606 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
609 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
611 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
612 val = val << BTRFS_KEY_TYPE_SHIFT;
613 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
616 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
618 return le64_to_cpu(h->blocknr);
621 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
623 h->blocknr = cpu_to_le64(blocknr);
626 static inline u64 btrfs_header_generation(struct btrfs_header *h)
628 return le64_to_cpu(h->generation);
631 static inline void btrfs_set_header_generation(struct btrfs_header *h,
634 h->generation = cpu_to_le64(val);
637 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
639 return le16_to_cpu(h->nritems);
642 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
644 h->nritems = cpu_to_le16(val);
647 static inline u16 btrfs_header_flags(struct btrfs_header *h)
649 return le16_to_cpu(h->flags);
652 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
654 h->flags = cpu_to_le16(val);
657 static inline int btrfs_header_level(struct btrfs_header *h)
662 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
664 BUG_ON(level > BTRFS_MAX_LEVEL);
668 static inline int btrfs_is_leaf(struct btrfs_node *n)
670 return (btrfs_header_level(&n->header) == 0);
673 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
675 return le64_to_cpu(item->blocknr);
678 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
680 item->blocknr = cpu_to_le64(val);
683 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
685 return le64_to_cpu(item->root_dirid);
688 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
690 item->root_dirid = cpu_to_le64(val);
693 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
695 return le32_to_cpu(item->refs);
698 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
700 item->refs = cpu_to_le32(val);
703 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
705 return le64_to_cpu(s->blocknr);
708 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
710 s->blocknr = cpu_to_le64(val);
713 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
715 return le64_to_cpu(s->generation);
718 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
721 s->generation = cpu_to_le64(val);
724 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
726 return le64_to_cpu(s->root);
729 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
731 s->root = cpu_to_le64(val);
734 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
736 return le64_to_cpu(s->total_blocks);
739 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
742 s->total_blocks = cpu_to_le64(val);
745 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
747 return le64_to_cpu(s->blocks_used);
750 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
753 s->blocks_used = cpu_to_le64(val);
756 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
758 return le32_to_cpu(s->blocksize);
761 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
764 s->blocksize = cpu_to_le32(val);
767 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
769 return le64_to_cpu(s->root_dir_objectid);
772 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
775 s->root_dir_objectid = cpu_to_le64(val);
778 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
780 return le64_to_cpu(s->last_device_id);
783 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
786 s->last_device_id = cpu_to_le64(val);
789 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
791 return le64_to_cpu(s->device_id);
794 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
797 s->device_id = cpu_to_le64(val);
800 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
802 return le64_to_cpu(s->device_block_start);
805 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
808 s->device_block_start = cpu_to_le64(val);
811 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
813 return le64_to_cpu(s->device_num_blocks);
816 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
819 s->device_num_blocks = cpu_to_le64(val);
822 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
824 return le64_to_cpu(s->device_root);
827 static inline void btrfs_set_super_device_root(struct btrfs_super_block
830 s->device_root = cpu_to_le64(val);
834 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
836 return (u8 *)l->items;
839 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
843 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
849 static inline char *btrfs_file_extent_inline_start(struct
850 btrfs_file_extent_item *e)
852 return (char *)(&e->disk_blocknr);
855 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
857 return (unsigned long)(&((struct
858 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
861 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
863 struct btrfs_file_extent_item *fe = NULL;
864 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
867 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
870 return le64_to_cpu(e->disk_blocknr);
873 static inline void btrfs_set_file_extent_disk_blocknr(struct
874 btrfs_file_extent_item
877 e->disk_blocknr = cpu_to_le64(val);
880 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
882 return le64_to_cpu(e->generation);
885 static inline void btrfs_set_file_extent_generation(struct
886 btrfs_file_extent_item *e,
889 e->generation = cpu_to_le64(val);
892 static inline u64 btrfs_file_extent_disk_num_blocks(struct
893 btrfs_file_extent_item *e)
895 return le64_to_cpu(e->disk_num_blocks);
898 static inline void btrfs_set_file_extent_disk_num_blocks(struct
899 btrfs_file_extent_item
902 e->disk_num_blocks = cpu_to_le64(val);
905 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
907 return le64_to_cpu(e->offset);
910 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
913 e->offset = cpu_to_le64(val);
916 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
919 return le64_to_cpu(e->num_blocks);
922 static inline void btrfs_set_file_extent_num_blocks(struct
923 btrfs_file_extent_item *e,
926 e->num_blocks = cpu_to_le64(val);
929 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
931 return le16_to_cpu(d->pathlen);
934 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
937 d->pathlen = cpu_to_le16(val);
940 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
942 return le64_to_cpu(d->device_id);
945 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
948 d->device_id = cpu_to_le64(val);
951 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
953 return sb->s_fs_info;
956 static inline void btrfs_check_bounds(void *vptr, size_t len,
957 void *vcontainer, size_t container_len)
960 char *container = vcontainer;
961 WARN_ON(ptr < container);
962 WARN_ON(ptr + len > container + container_len);
965 static inline void btrfs_memcpy(struct btrfs_root *root,
967 void *dst, const void *src, size_t nr)
969 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
970 memcpy(dst, src, nr);
973 static inline void btrfs_memmove(struct btrfs_root *root,
975 void *dst, void *src, size_t nr)
977 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
978 memmove(dst, src, nr);
981 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
983 WARN_ON(!atomic_read(&bh->b_count));
984 mark_buffer_dirty(bh);
987 /* helper function to cast into the data area of the leaf. */
988 #define btrfs_item_ptr(leaf, slot, type) \
989 ((type *)(btrfs_leaf_data(leaf) + \
990 btrfs_item_offset((leaf)->items + (slot))))
993 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
994 struct btrfs_root *root);
995 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
996 struct btrfs_root *root);
997 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
998 *root, u64 num_blocks, u64 search_start, u64
999 search_end, struct btrfs_key *ins);
1000 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1001 struct buffer_head *buf);
1002 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1003 *root, u64 blocknr, u64 num_blocks, int pin);
1004 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1006 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1007 struct btrfs_root *root,
1008 u64 blocknr, u64 num_blocks);
1010 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1011 *root, struct btrfs_path *path, u32 data_size);
1012 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1013 struct btrfs_root *root,
1014 struct btrfs_path *path,
1016 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1017 *root, struct btrfs_key *key, struct btrfs_path *p, int
1019 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1020 struct btrfs_path *btrfs_alloc_path(void);
1021 void btrfs_free_path(struct btrfs_path *p);
1022 void btrfs_init_path(struct btrfs_path *p);
1023 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1024 struct btrfs_path *path);
1025 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1026 *root, struct btrfs_key *key, void *data, u32 data_size);
1027 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1028 *root, struct btrfs_path *path, struct btrfs_key
1029 *cpu_key, u32 data_size);
1030 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1031 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1032 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1033 *root, struct buffer_head *snap);
1035 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1036 struct btrfs_key *key);
1037 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1038 *root, struct btrfs_key *key, struct btrfs_root_item
1040 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1041 *root, struct btrfs_key *key, struct btrfs_root_item
1043 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1044 btrfs_root_item *item, struct btrfs_key *key);
1046 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1047 *root, const char *name, int name_len, u64 dir,
1048 struct btrfs_key *location, u8 type);
1049 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1050 struct btrfs_root *root,
1051 struct btrfs_path *path, u64 dir,
1052 const char *name, int name_len,
1054 struct btrfs_dir_item *
1055 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1056 struct btrfs_root *root,
1057 struct btrfs_path *path, u64 dir,
1058 u64 objectid, const char *name, int name_len,
1060 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1061 struct btrfs_path *path,
1062 const char *name, int name_len);
1063 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1064 struct btrfs_root *root,
1065 struct btrfs_path *path,
1066 struct btrfs_dir_item *di);
1068 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1069 struct btrfs_root *fs_root,
1070 u64 dirid, u64 *objectid);
1071 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1074 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1075 *root, u64 objectid, struct btrfs_inode_item
1077 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1078 *root, struct btrfs_path *path,
1079 struct btrfs_key *location, int mod);
1082 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1083 struct btrfs_root *root,
1084 u64 objectid, u64 pos, u64 offset,
1086 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1087 struct btrfs_root *root,
1088 struct btrfs_path *path, u64 objectid,
1089 u64 blocknr, int mod);
1090 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1091 struct btrfs_root *root,
1092 u64 objectid, u64 offset,
1093 char *data, size_t len);
1094 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1095 u64 objectid, u64 offset,
1096 char *data, size_t len);
1097 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1098 struct btrfs_root *root,
1099 struct btrfs_path *path,
1100 u64 objectid, u64 offset,
1103 extern struct subsystem btrfs_subsys;