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 /* inline data is just a blob of bytes */
189 struct btrfs_inline_data_item {
191 } __attribute__ ((__packed__));
193 struct btrfs_dir_item {
194 struct btrfs_disk_key location;
198 } __attribute__ ((__packed__));
200 struct btrfs_root_item {
201 struct btrfs_inode_item inode;
208 } __attribute__ ((__packed__));
210 #define BTRFS_FILE_EXTENT_REG 0
211 #define BTRFS_FILE_EXTENT_INLINE 1
213 struct btrfs_file_extent_item {
217 * disk space consumed by the extent, checksum blocks are included
221 __le64 disk_num_blocks;
223 * the logical offset in file blocks (no csums)
224 * this extent record is for. This allows a file extent to point
225 * into the middle of an existing extent on disk, sharing it
226 * between two snapshots (useful if some bytes in the middle of the
227 * extent have changed
231 * the logical number of file blocks (no csums included)
234 } __attribute__ ((__packed__));
236 struct btrfs_csum_item {
237 u8 csum[BTRFS_CSUM_SIZE];
238 } __attribute__ ((__packed__));
240 struct btrfs_device_item {
243 } __attribute__ ((__packed__));
246 struct btrfs_fs_info {
247 struct btrfs_root *extent_root;
248 struct btrfs_root *tree_root;
249 struct btrfs_root *dev_root;
250 struct btrfs_key current_insert;
251 struct btrfs_key last_insert;
252 struct radix_tree_root fs_roots_radix;
253 struct radix_tree_root pending_del_radix;
254 struct radix_tree_root pinned_radix;
255 struct radix_tree_root dev_radix;
257 struct btrfs_transaction *running_transaction;
258 struct btrfs_super_block *disk_super;
259 struct buffer_head *sb_buffer;
260 struct super_block *sb;
261 struct inode *btree_inode;
262 struct mutex trans_mutex;
263 struct mutex fs_mutex;
264 struct crypto_hash *hash_tfm;
265 spinlock_t hash_lock;
270 * in ram representation of the tree. extent_root is used for all allocations
271 * and for the extent tree extent_root root. current_insert is used
272 * only for the extent tree.
275 struct buffer_head *node;
276 struct buffer_head *commit_root;
277 struct btrfs_root_item root_item;
278 struct btrfs_key root_key;
279 struct btrfs_fs_info *fs_info;
287 u64 last_inode_alloc;
290 /* the lower bits in the key flags defines the item type */
291 #define BTRFS_KEY_TYPE_MAX 256
292 #define BTRFS_KEY_TYPE_SHIFT 24
293 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
294 BTRFS_KEY_TYPE_SHIFT)
296 #define BTRFS_KEY_OVERFLOW_MAX 128
297 #define BTRFS_KEY_OVERFLOW_MASK ((u32)BTRFS_KEY_OVERFLOW_MAX - 1)
300 * inode items have the data typically returned from stat and store other
301 * info about object characteristics. There is one for every file and dir in
304 #define BTRFS_INODE_ITEM_KEY 1
307 * dir items are the name -> inode pointers in a directory. There is one
308 * for every name in a directory.
310 #define BTRFS_DIR_ITEM_KEY 2
311 #define BTRFS_DIR_INDEX_KEY 3
313 * inline data is file data that fits in the btree.
315 #define BTRFS_INLINE_DATA_KEY 4
317 * extent data is for data that can't fit in the btree. It points to
318 * a (hopefully) huge chunk of disk
320 #define BTRFS_EXTENT_DATA_KEY 5
322 * csum items have the checksums for data in the extents
324 #define BTRFS_CSUM_ITEM_KEY 6
327 * root items point to tree roots. There are typically in the root
328 * tree used by the super block to find all the other trees
330 #define BTRFS_ROOT_ITEM_KEY 7
332 * extent items are in the extent map tree. These record which blocks
333 * are used, and how many references there are to each block
335 #define BTRFS_EXTENT_ITEM_KEY 8
338 * dev items list the devices that make up the FS
340 #define BTRFS_DEV_ITEM_KEY 9
343 * string items are for debugging. They just store a short string of
346 #define BTRFS_STRING_ITEM_KEY 10
348 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
350 return le64_to_cpu(i->generation);
353 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
356 i->generation = cpu_to_le64(val);
359 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
361 return le64_to_cpu(i->size);
364 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
366 i->size = cpu_to_le64(val);
369 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
371 return le64_to_cpu(i->nblocks);
374 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
376 i->nblocks = cpu_to_le64(val);
379 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
381 return le32_to_cpu(i->nlink);
384 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
386 i->nlink = cpu_to_le32(val);
389 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
391 return le32_to_cpu(i->uid);
394 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
396 i->uid = cpu_to_le32(val);
399 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
401 return le32_to_cpu(i->gid);
404 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
406 i->gid = cpu_to_le32(val);
409 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
411 return le32_to_cpu(i->mode);
414 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
416 i->mode = cpu_to_le32(val);
419 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
421 return le32_to_cpu(i->rdev);
424 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
426 i->rdev = cpu_to_le32(val);
429 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
431 return le16_to_cpu(i->flags);
434 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
436 i->flags = cpu_to_le16(val);
439 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
441 return le16_to_cpu(i->compat_flags);
444 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
447 i->compat_flags = cpu_to_le16(val);
450 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
452 return le64_to_cpu(ts->sec);
455 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
458 ts->sec = cpu_to_le64(val);
461 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
463 return le32_to_cpu(ts->nsec);
466 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
469 ts->nsec = cpu_to_le32(val);
472 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
474 return le32_to_cpu(ei->refs);
477 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
479 ei->refs = cpu_to_le32(val);
482 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
484 return le64_to_cpu(n->ptrs[nr].blockptr);
487 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
490 n->ptrs[nr].blockptr = cpu_to_le64(val);
493 static inline u32 btrfs_item_offset(struct btrfs_item *item)
495 return le32_to_cpu(item->offset);
498 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
500 item->offset = cpu_to_le32(val);
503 static inline u32 btrfs_item_end(struct btrfs_item *item)
505 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
508 static inline u16 btrfs_item_size(struct btrfs_item *item)
510 return le16_to_cpu(item->size);
513 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
515 item->size = cpu_to_le16(val);
518 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
520 return le16_to_cpu(d->flags);
523 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
525 d->flags = cpu_to_le16(val);
528 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
533 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
538 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
540 return le16_to_cpu(d->name_len);
543 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
545 d->name_len = cpu_to_le16(val);
548 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
549 struct btrfs_disk_key *disk)
551 cpu->offset = le64_to_cpu(disk->offset);
552 cpu->flags = le32_to_cpu(disk->flags);
553 cpu->objectid = le64_to_cpu(disk->objectid);
556 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
557 struct btrfs_key *cpu)
559 disk->offset = cpu_to_le64(cpu->offset);
560 disk->flags = cpu_to_le32(cpu->flags);
561 disk->objectid = cpu_to_le64(cpu->objectid);
564 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
566 return le64_to_cpu(disk->objectid);
569 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
572 disk->objectid = cpu_to_le64(val);
575 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
577 return le64_to_cpu(disk->offset);
580 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
583 disk->offset = cpu_to_le64(val);
586 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
588 return le32_to_cpu(disk->flags);
591 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
594 disk->flags = cpu_to_le32(val);
597 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
599 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
602 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
605 u32 flags = btrfs_disk_key_flags(key);
606 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
607 val = val << BTRFS_KEY_TYPE_SHIFT;
608 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
609 btrfs_set_disk_key_flags(key, flags);
612 static inline u32 btrfs_key_type(struct btrfs_key *key)
614 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
617 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
619 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
620 val = val << BTRFS_KEY_TYPE_SHIFT;
621 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
624 static inline u32 btrfs_key_overflow(struct btrfs_key *key)
626 return key->flags & BTRFS_KEY_OVERFLOW_MASK;
629 static inline void btrfs_set_key_overflow(struct btrfs_key *key, u32 over)
631 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
632 key->flags = (key->flags & ~BTRFS_KEY_OVERFLOW_MASK) | over;
635 static inline u32 btrfs_disk_key_overflow(struct btrfs_disk_key *key)
637 return le32_to_cpu(key->flags) & BTRFS_KEY_OVERFLOW_MASK;
640 static inline void btrfs_set_disk_key_overflow(struct btrfs_disk_key *key,
643 u32 flags = btrfs_disk_key_flags(key);
644 BUG_ON(over >= BTRFS_KEY_OVERFLOW_MAX);
645 flags = (flags & ~BTRFS_KEY_OVERFLOW_MASK) | over;
646 btrfs_set_disk_key_flags(key, flags);
649 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
651 return le64_to_cpu(h->blocknr);
654 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
656 h->blocknr = cpu_to_le64(blocknr);
659 static inline u64 btrfs_header_generation(struct btrfs_header *h)
661 return le64_to_cpu(h->generation);
664 static inline void btrfs_set_header_generation(struct btrfs_header *h,
667 h->generation = cpu_to_le64(val);
670 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
672 return le16_to_cpu(h->nritems);
675 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
677 h->nritems = cpu_to_le16(val);
680 static inline u16 btrfs_header_flags(struct btrfs_header *h)
682 return le16_to_cpu(h->flags);
685 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
687 h->flags = cpu_to_le16(val);
690 static inline int btrfs_header_level(struct btrfs_header *h)
695 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
697 BUG_ON(level > BTRFS_MAX_LEVEL);
701 static inline int btrfs_is_leaf(struct btrfs_node *n)
703 return (btrfs_header_level(&n->header) == 0);
706 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
708 return le64_to_cpu(item->blocknr);
711 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
713 item->blocknr = cpu_to_le64(val);
716 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
718 return le64_to_cpu(item->root_dirid);
721 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
723 item->root_dirid = cpu_to_le64(val);
726 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
728 return le32_to_cpu(item->refs);
731 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
733 item->refs = cpu_to_le32(val);
736 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
738 return le64_to_cpu(s->blocknr);
741 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
743 s->blocknr = cpu_to_le64(val);
746 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
748 return le64_to_cpu(s->generation);
751 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
754 s->generation = cpu_to_le64(val);
757 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
759 return le64_to_cpu(s->root);
762 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
764 s->root = cpu_to_le64(val);
767 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
769 return le64_to_cpu(s->total_blocks);
772 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
775 s->total_blocks = cpu_to_le64(val);
778 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
780 return le64_to_cpu(s->blocks_used);
783 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
786 s->blocks_used = cpu_to_le64(val);
789 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
791 return le32_to_cpu(s->blocksize);
794 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
797 s->blocksize = cpu_to_le32(val);
800 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
802 return le64_to_cpu(s->root_dir_objectid);
805 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
808 s->root_dir_objectid = cpu_to_le64(val);
811 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
813 return le64_to_cpu(s->last_device_id);
816 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
819 s->last_device_id = cpu_to_le64(val);
822 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
824 return le64_to_cpu(s->device_id);
827 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
830 s->device_id = cpu_to_le64(val);
833 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
835 return le64_to_cpu(s->device_block_start);
838 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
841 s->device_block_start = cpu_to_le64(val);
844 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
846 return le64_to_cpu(s->device_num_blocks);
849 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
852 s->device_num_blocks = cpu_to_le64(val);
855 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
857 return le64_to_cpu(s->device_root);
860 static inline void btrfs_set_super_device_root(struct btrfs_super_block
863 s->device_root = cpu_to_le64(val);
867 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
869 return (u8 *)l->items;
872 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
876 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
882 static inline char *btrfs_file_extent_inline_start(struct
883 btrfs_file_extent_item *e)
885 return (char *)(&e->disk_blocknr);
888 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
890 return (unsigned long)(&((struct
891 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
894 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
896 struct btrfs_file_extent_item *fe = NULL;
897 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
900 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
903 return le64_to_cpu(e->disk_blocknr);
906 static inline void btrfs_set_file_extent_disk_blocknr(struct
907 btrfs_file_extent_item
910 e->disk_blocknr = cpu_to_le64(val);
913 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
915 return le64_to_cpu(e->generation);
918 static inline void btrfs_set_file_extent_generation(struct
919 btrfs_file_extent_item *e,
922 e->generation = cpu_to_le64(val);
925 static inline u64 btrfs_file_extent_disk_num_blocks(struct
926 btrfs_file_extent_item *e)
928 return le64_to_cpu(e->disk_num_blocks);
931 static inline void btrfs_set_file_extent_disk_num_blocks(struct
932 btrfs_file_extent_item
935 e->disk_num_blocks = cpu_to_le64(val);
938 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
940 return le64_to_cpu(e->offset);
943 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
946 e->offset = cpu_to_le64(val);
949 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
952 return le64_to_cpu(e->num_blocks);
955 static inline void btrfs_set_file_extent_num_blocks(struct
956 btrfs_file_extent_item *e,
959 e->num_blocks = cpu_to_le64(val);
962 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
964 return le16_to_cpu(d->pathlen);
967 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
970 d->pathlen = cpu_to_le16(val);
973 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
975 return le64_to_cpu(d->device_id);
978 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
981 d->device_id = cpu_to_le64(val);
984 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
986 return sb->s_fs_info;
989 static inline void btrfs_check_bounds(void *vptr, size_t len,
990 void *vcontainer, size_t container_len)
993 char *container = vcontainer;
994 WARN_ON(ptr < container);
995 WARN_ON(ptr + len > container + container_len);
998 static inline void btrfs_memcpy(struct btrfs_root *root,
1000 void *dst, const void *src, size_t nr)
1002 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1003 memcpy(dst, src, nr);
1006 static inline void btrfs_memmove(struct btrfs_root *root,
1008 void *dst, void *src, size_t nr)
1010 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1011 memmove(dst, src, nr);
1014 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1016 WARN_ON(!atomic_read(&bh->b_count));
1017 mark_buffer_dirty(bh);
1020 /* helper function to cast into the data area of the leaf. */
1021 #define btrfs_item_ptr(leaf, slot, type) \
1022 ((type *)(btrfs_leaf_data(leaf) + \
1023 btrfs_item_offset((leaf)->items + (slot))))
1026 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1027 struct btrfs_root *root);
1028 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1029 struct btrfs_root *root);
1030 int btrfs_alloc_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1031 *root, u64 num_blocks, u64 search_start, u64
1032 search_end, struct btrfs_key *ins);
1033 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1034 struct buffer_head *buf);
1035 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1036 *root, u64 blocknr, u64 num_blocks, int pin);
1037 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1039 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1040 struct btrfs_root *root,
1041 u64 blocknr, u64 num_blocks);
1043 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1044 *root, struct btrfs_path *path, u32 data_size);
1045 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1046 struct btrfs_root *root,
1047 struct btrfs_path *path,
1049 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1050 *root, struct btrfs_key *key, struct btrfs_path *p, int
1052 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1053 struct btrfs_path *btrfs_alloc_path(void);
1054 void btrfs_free_path(struct btrfs_path *p);
1055 void btrfs_init_path(struct btrfs_path *p);
1056 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1057 struct btrfs_path *path);
1058 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1059 *root, struct btrfs_key *key, void *data, u32 data_size);
1060 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1061 *root, struct btrfs_path *path, struct btrfs_key
1062 *cpu_key, u32 data_size);
1063 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1064 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1065 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1066 *root, struct buffer_head *snap);
1068 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1069 struct btrfs_key *key);
1070 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1071 *root, struct btrfs_key *key, struct btrfs_root_item
1073 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1074 *root, struct btrfs_key *key, struct btrfs_root_item
1076 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1077 btrfs_root_item *item, struct btrfs_key *key);
1079 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1080 *root, const char *name, int name_len, u64 dir,
1081 struct btrfs_key *location, u8 type);
1082 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1083 *root, struct btrfs_path *path, u64 dir,
1084 const char *name, int name_len, int mod);
1085 int btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1086 struct btrfs_root *root,
1087 struct btrfs_path *path, u64 dir,
1088 u64 objectid, int mod);
1089 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
1090 const char *name, int name_len);
1092 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1093 struct btrfs_root *fs_root,
1094 u64 dirid, u64 *objectid);
1095 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1098 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1099 *root, u64 objectid, struct btrfs_inode_item
1101 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1102 *root, struct btrfs_path *path,
1103 struct btrfs_key *location, int mod);
1106 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1107 struct btrfs_root *root,
1108 u64 objectid, u64 pos, u64 offset,
1110 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1111 struct btrfs_root *root,
1112 struct btrfs_path *path, u64 objectid,
1113 u64 blocknr, int mod);
1114 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1115 struct btrfs_root *root,
1116 u64 objectid, u64 offset,
1117 char *data, size_t len);
1118 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1119 u64 objectid, u64 offset,
1120 char *data, size_t len);
1121 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1122 struct btrfs_root *root,
1123 struct btrfs_path *path,
1124 u64 objectid, u64 offset,
1127 extern struct subsystem btrfs_subsys;