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;
267 * in ram representation of the tree. extent_root is used for all allocations
268 * and for the extent tree extent_root root. current_insert is used
269 * only for the extent tree.
272 struct buffer_head *node;
273 struct buffer_head *commit_root;
274 struct btrfs_root_item root_item;
275 struct btrfs_key root_key;
276 struct btrfs_fs_info *fs_info;
284 u64 last_inode_alloc;
287 /* the lower bits in the key flags defines the item type */
288 #define BTRFS_KEY_TYPE_MAX 256
289 #define BTRFS_KEY_TYPE_SHIFT 24
290 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
291 BTRFS_KEY_TYPE_SHIFT)
294 * inode items have the data typically returned from stat and store other
295 * info about object characteristics. There is one for every file and dir in
298 #define BTRFS_INODE_ITEM_KEY 1
301 * dir items are the name -> inode pointers in a directory. There is one
302 * for every name in a directory.
304 #define BTRFS_DIR_ITEM_KEY 2
305 #define BTRFS_DIR_INDEX_KEY 3
307 * inline data is file data that fits in the btree.
309 #define BTRFS_INLINE_DATA_KEY 4
311 * extent data is for data that can't fit in the btree. It points to
312 * a (hopefully) huge chunk of disk
314 #define BTRFS_EXTENT_DATA_KEY 5
316 * csum items have the checksums for data in the extents
318 #define BTRFS_CSUM_ITEM_KEY 6
321 * root items point to tree roots. There are typically in the root
322 * tree used by the super block to find all the other trees
324 #define BTRFS_ROOT_ITEM_KEY 7
326 * extent items are in the extent map tree. These record which blocks
327 * are used, and how many references there are to each block
329 #define BTRFS_EXTENT_ITEM_KEY 8
332 * dev items list the devices that make up the FS
334 #define BTRFS_DEV_ITEM_KEY 9
337 * string items are for debugging. They just store a short string of
340 #define BTRFS_STRING_ITEM_KEY 10
342 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
344 return le64_to_cpu(i->generation);
347 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
350 i->generation = cpu_to_le64(val);
353 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
355 return le64_to_cpu(i->size);
358 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
360 i->size = cpu_to_le64(val);
363 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
365 return le64_to_cpu(i->nblocks);
368 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
370 i->nblocks = cpu_to_le64(val);
373 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
375 return le32_to_cpu(i->nlink);
378 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
380 i->nlink = cpu_to_le32(val);
383 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
385 return le32_to_cpu(i->uid);
388 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
390 i->uid = cpu_to_le32(val);
393 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
395 return le32_to_cpu(i->gid);
398 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
400 i->gid = cpu_to_le32(val);
403 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
405 return le32_to_cpu(i->mode);
408 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
410 i->mode = cpu_to_le32(val);
413 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
415 return le32_to_cpu(i->rdev);
418 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
420 i->rdev = cpu_to_le32(val);
423 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
425 return le16_to_cpu(i->flags);
428 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
430 i->flags = cpu_to_le16(val);
433 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
435 return le16_to_cpu(i->compat_flags);
438 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
441 i->compat_flags = cpu_to_le16(val);
444 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
446 return le64_to_cpu(ts->sec);
449 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
452 ts->sec = cpu_to_le64(val);
455 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
457 return le32_to_cpu(ts->nsec);
460 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
463 ts->nsec = cpu_to_le32(val);
466 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
468 return le32_to_cpu(ei->refs);
471 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
473 ei->refs = cpu_to_le32(val);
476 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
478 return le64_to_cpu(n->ptrs[nr].blockptr);
481 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
484 n->ptrs[nr].blockptr = cpu_to_le64(val);
487 static inline u32 btrfs_item_offset(struct btrfs_item *item)
489 return le32_to_cpu(item->offset);
492 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
494 item->offset = cpu_to_le32(val);
497 static inline u32 btrfs_item_end(struct btrfs_item *item)
499 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
502 static inline u16 btrfs_item_size(struct btrfs_item *item)
504 return le16_to_cpu(item->size);
507 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
509 item->size = cpu_to_le16(val);
512 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
514 return le16_to_cpu(d->flags);
517 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
519 d->flags = cpu_to_le16(val);
522 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
527 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
532 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
534 return le16_to_cpu(d->name_len);
537 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
539 d->name_len = cpu_to_le16(val);
542 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
543 struct btrfs_disk_key *disk)
545 cpu->offset = le64_to_cpu(disk->offset);
546 cpu->flags = le32_to_cpu(disk->flags);
547 cpu->objectid = le64_to_cpu(disk->objectid);
550 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
551 struct btrfs_key *cpu)
553 disk->offset = cpu_to_le64(cpu->offset);
554 disk->flags = cpu_to_le32(cpu->flags);
555 disk->objectid = cpu_to_le64(cpu->objectid);
558 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
560 return le64_to_cpu(disk->objectid);
563 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
566 disk->objectid = cpu_to_le64(val);
569 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
571 return le64_to_cpu(disk->offset);
574 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
577 disk->offset = cpu_to_le64(val);
580 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
582 return le32_to_cpu(disk->flags);
585 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
588 disk->flags = cpu_to_le32(val);
591 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
593 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
596 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
599 u32 flags = btrfs_disk_key_flags(key);
600 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
601 val = val << BTRFS_KEY_TYPE_SHIFT;
602 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
603 btrfs_set_disk_key_flags(key, flags);
606 static inline u32 btrfs_key_type(struct btrfs_key *key)
608 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
611 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
613 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
614 val = val << BTRFS_KEY_TYPE_SHIFT;
615 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
618 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
620 return le64_to_cpu(h->blocknr);
623 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
625 h->blocknr = cpu_to_le64(blocknr);
628 static inline u64 btrfs_header_generation(struct btrfs_header *h)
630 return le64_to_cpu(h->generation);
633 static inline void btrfs_set_header_generation(struct btrfs_header *h,
636 h->generation = cpu_to_le64(val);
639 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
641 return le16_to_cpu(h->nritems);
644 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
646 h->nritems = cpu_to_le16(val);
649 static inline u16 btrfs_header_flags(struct btrfs_header *h)
651 return le16_to_cpu(h->flags);
654 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
656 h->flags = cpu_to_le16(val);
659 static inline int btrfs_header_level(struct btrfs_header *h)
664 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
666 BUG_ON(level > BTRFS_MAX_LEVEL);
670 static inline int btrfs_is_leaf(struct btrfs_node *n)
672 return (btrfs_header_level(&n->header) == 0);
675 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
677 return le64_to_cpu(item->blocknr);
680 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
682 item->blocknr = cpu_to_le64(val);
685 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
687 return le64_to_cpu(item->root_dirid);
690 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
692 item->root_dirid = cpu_to_le64(val);
695 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
697 return le32_to_cpu(item->refs);
700 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
702 item->refs = cpu_to_le32(val);
705 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
707 return le64_to_cpu(s->blocknr);
710 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
712 s->blocknr = cpu_to_le64(val);
715 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
717 return le64_to_cpu(s->generation);
720 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
723 s->generation = cpu_to_le64(val);
726 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
728 return le64_to_cpu(s->root);
731 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
733 s->root = cpu_to_le64(val);
736 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
738 return le64_to_cpu(s->total_blocks);
741 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
744 s->total_blocks = cpu_to_le64(val);
747 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
749 return le64_to_cpu(s->blocks_used);
752 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
755 s->blocks_used = cpu_to_le64(val);
758 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
760 return le32_to_cpu(s->blocksize);
763 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
766 s->blocksize = cpu_to_le32(val);
769 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
771 return le64_to_cpu(s->root_dir_objectid);
774 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
777 s->root_dir_objectid = cpu_to_le64(val);
780 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
782 return le64_to_cpu(s->last_device_id);
785 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
788 s->last_device_id = cpu_to_le64(val);
791 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
793 return le64_to_cpu(s->device_id);
796 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
799 s->device_id = cpu_to_le64(val);
802 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
804 return le64_to_cpu(s->device_block_start);
807 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
810 s->device_block_start = cpu_to_le64(val);
813 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
815 return le64_to_cpu(s->device_num_blocks);
818 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
821 s->device_num_blocks = cpu_to_le64(val);
824 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
826 return le64_to_cpu(s->device_root);
829 static inline void btrfs_set_super_device_root(struct btrfs_super_block
832 s->device_root = cpu_to_le64(val);
836 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
838 return (u8 *)l->items;
841 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
845 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
851 static inline char *btrfs_file_extent_inline_start(struct
852 btrfs_file_extent_item *e)
854 return (char *)(&e->disk_blocknr);
857 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
859 return (unsigned long)(&((struct
860 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
863 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
865 struct btrfs_file_extent_item *fe = NULL;
866 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
869 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
872 return le64_to_cpu(e->disk_blocknr);
875 static inline void btrfs_set_file_extent_disk_blocknr(struct
876 btrfs_file_extent_item
879 e->disk_blocknr = cpu_to_le64(val);
882 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
884 return le64_to_cpu(e->generation);
887 static inline void btrfs_set_file_extent_generation(struct
888 btrfs_file_extent_item *e,
891 e->generation = cpu_to_le64(val);
894 static inline u64 btrfs_file_extent_disk_num_blocks(struct
895 btrfs_file_extent_item *e)
897 return le64_to_cpu(e->disk_num_blocks);
900 static inline void btrfs_set_file_extent_disk_num_blocks(struct
901 btrfs_file_extent_item
904 e->disk_num_blocks = cpu_to_le64(val);
907 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
909 return le64_to_cpu(e->offset);
912 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
915 e->offset = cpu_to_le64(val);
918 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
921 return le64_to_cpu(e->num_blocks);
924 static inline void btrfs_set_file_extent_num_blocks(struct
925 btrfs_file_extent_item *e,
928 e->num_blocks = cpu_to_le64(val);
931 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
933 return le16_to_cpu(d->pathlen);
936 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
939 d->pathlen = cpu_to_le16(val);
942 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
944 return le64_to_cpu(d->device_id);
947 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
950 d->device_id = cpu_to_le64(val);
953 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
955 return sb->s_fs_info;
958 static inline void btrfs_check_bounds(void *vptr, size_t len,
959 void *vcontainer, size_t container_len)
962 char *container = vcontainer;
963 WARN_ON(ptr < container);
964 WARN_ON(ptr + len > container + container_len);
967 static inline void btrfs_memcpy(struct btrfs_root *root,
969 void *dst, const void *src, size_t nr)
971 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
972 memcpy(dst, src, nr);
975 static inline void btrfs_memmove(struct btrfs_root *root,
977 void *dst, void *src, size_t nr)
979 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
980 memmove(dst, src, nr);
983 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
985 WARN_ON(!atomic_read(&bh->b_count));
986 mark_buffer_dirty(bh);
989 /* helper function to cast into the data area of the leaf. */
990 #define btrfs_item_ptr(leaf, slot, type) \
991 ((type *)(btrfs_leaf_data(leaf) + \
992 btrfs_item_offset((leaf)->items + (slot))))
995 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
996 struct btrfs_root *root);
997 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
998 struct btrfs_root *root);
999 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1000 *root, u64 num_blocks, u64 search_start, u64
1001 search_end, struct btrfs_key *ins);
1002 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1003 struct buffer_head *buf);
1004 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1005 *root, u64 blocknr, u64 num_blocks, int pin);
1006 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1008 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1009 struct btrfs_root *root,
1010 u64 blocknr, u64 num_blocks);
1012 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1013 *root, struct btrfs_path *path, u32 data_size);
1014 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1015 struct btrfs_root *root,
1016 struct btrfs_path *path,
1018 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1019 *root, struct btrfs_key *key, struct btrfs_path *p, int
1021 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1022 struct btrfs_path *btrfs_alloc_path(void);
1023 void btrfs_free_path(struct btrfs_path *p);
1024 void btrfs_init_path(struct btrfs_path *p);
1025 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1026 struct btrfs_path *path);
1027 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1028 *root, struct btrfs_key *key, void *data, u32 data_size);
1029 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1030 *root, struct btrfs_path *path, struct btrfs_key
1031 *cpu_key, u32 data_size);
1032 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1033 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1034 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1035 *root, struct buffer_head *snap);
1037 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1038 struct btrfs_key *key);
1039 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1040 *root, struct btrfs_key *key, struct btrfs_root_item
1042 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1043 *root, struct btrfs_key *key, struct btrfs_root_item
1045 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1046 btrfs_root_item *item, struct btrfs_key *key);
1048 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1049 *root, const char *name, int name_len, u64 dir,
1050 struct btrfs_key *location, u8 type);
1051 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1052 struct btrfs_root *root,
1053 struct btrfs_path *path, u64 dir,
1054 const char *name, int name_len,
1056 struct btrfs_dir_item *
1057 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1058 struct btrfs_root *root,
1059 struct btrfs_path *path, u64 dir,
1060 u64 objectid, const char *name, int name_len,
1062 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1063 struct btrfs_path *path,
1064 const char *name, int name_len);
1065 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1066 struct btrfs_root *root,
1067 struct btrfs_path *path,
1068 struct btrfs_dir_item *di);
1070 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1071 struct btrfs_root *fs_root,
1072 u64 dirid, u64 *objectid);
1073 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1076 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1077 *root, u64 objectid, struct btrfs_inode_item
1079 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1080 *root, struct btrfs_path *path,
1081 struct btrfs_key *location, int mod);
1084 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1085 struct btrfs_root *root,
1086 u64 objectid, u64 pos, u64 offset,
1088 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1089 struct btrfs_root *root,
1090 struct btrfs_path *path, u64 objectid,
1091 u64 blocknr, int mod);
1092 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1093 struct btrfs_root *root,
1094 u64 objectid, u64 offset,
1095 char *data, size_t len);
1096 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1097 u64 objectid, u64 offset,
1098 char *data, size_t len);
1099 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1100 struct btrfs_root *root,
1101 struct btrfs_path *path,
1102 u64 objectid, u64 offset,
1105 extern struct subsystem btrfs_subsys;