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 */
69 } __attribute__ ((__packed__));
71 #define BTRFS_MAX_LEVEL 8
72 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
73 sizeof(struct btrfs_header)) / \
74 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
75 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
76 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
77 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
78 sizeof(struct btrfs_item) - \
79 sizeof(struct btrfs_file_extent_item))
83 * the super block basically lists the main trees of the FS
84 * it currently lacks any block count etc etc
86 struct btrfs_super_block {
87 u8 csum[BTRFS_CSUM_SIZE];
88 /* the first 3 fields must match struct btrfs_header */
89 u8 fsid[16]; /* FS specific uuid */
90 __le64 blocknr; /* this block number */
97 __le64 root_dir_objectid;
98 __le64 last_device_id;
99 /* fields below here vary with the underlying disk */
100 __le64 device_block_start;
101 __le64 device_num_blocks;
104 } __attribute__ ((__packed__));
107 * A leaf is full of items. offset and size tell us where to find
108 * the item in the leaf (relative to the start of the data area)
111 struct btrfs_disk_key key;
114 } __attribute__ ((__packed__));
117 * leaves have an item area and a data area:
118 * [item0, item1....itemN] [free space] [dataN...data1, data0]
120 * The data is separate from the items to get the keys closer together
124 struct btrfs_header header;
125 struct btrfs_item items[];
126 } __attribute__ ((__packed__));
129 * all non-leaf blocks are nodes, they hold only keys and pointers to
132 struct btrfs_key_ptr {
133 struct btrfs_disk_key key;
135 } __attribute__ ((__packed__));
138 struct btrfs_header header;
139 struct btrfs_key_ptr ptrs[];
140 } __attribute__ ((__packed__));
143 * btrfs_paths remember the path taken from the root down to the leaf.
144 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
145 * to any other levels that are present.
147 * The slots array records the index of the item or block pointer
148 * used while walking the tree.
151 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
152 int slots[BTRFS_MAX_LEVEL];
156 * items in the extent btree are used to record the objectid of the
157 * owner of the block and the number of references
159 struct btrfs_extent_item {
162 } __attribute__ ((__packed__));
164 struct btrfs_inode_timespec {
167 } __attribute__ ((__packed__));
170 * there is no padding here on purpose. If you want to extent the inode,
171 * make a new item type
173 struct btrfs_inode_item {
184 struct btrfs_inode_timespec atime;
185 struct btrfs_inode_timespec ctime;
186 struct btrfs_inode_timespec mtime;
187 struct btrfs_inode_timespec otime;
188 } __attribute__ ((__packed__));
190 struct btrfs_dir_item {
191 struct btrfs_disk_key location;
195 } __attribute__ ((__packed__));
197 struct btrfs_root_item {
198 struct btrfs_inode_item inode;
205 } __attribute__ ((__packed__));
207 #define BTRFS_FILE_EXTENT_REG 0
208 #define BTRFS_FILE_EXTENT_INLINE 1
210 struct btrfs_file_extent_item {
214 * disk space consumed by the extent, checksum blocks are included
218 __le64 disk_num_blocks;
220 * the logical offset in file blocks (no csums)
221 * this extent record is for. This allows a file extent to point
222 * into the middle of an existing extent on disk, sharing it
223 * between two snapshots (useful if some bytes in the middle of the
224 * extent have changed
228 * the logical number of file blocks (no csums included)
231 } __attribute__ ((__packed__));
233 struct btrfs_csum_item {
234 u8 csum[BTRFS_CSUM_SIZE];
235 } __attribute__ ((__packed__));
237 struct btrfs_device_item {
240 } __attribute__ ((__packed__));
242 /* tag for the radix tree of block groups in ram */
243 #define BTRFS_BLOCK_GROUP_DIRTY 0
244 #define BTRFS_BLOCK_GROUP_HINTS 8
245 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
246 struct btrfs_block_group_item {
248 } __attribute__ ((__packed__));
250 struct btrfs_block_group_cache {
251 struct btrfs_key key;
252 struct btrfs_block_group_item item;
258 struct btrfs_fs_info {
259 struct btrfs_root *extent_root;
260 struct btrfs_root *tree_root;
261 struct btrfs_root *dev_root;
262 struct btrfs_block_group_cache *block_group_cache;
263 struct radix_tree_root fs_roots_radix;
264 struct radix_tree_root pending_del_radix;
265 struct radix_tree_root pinned_radix;
266 struct radix_tree_root dev_radix;
267 struct radix_tree_root block_group_radix;
269 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
270 int extent_tree_insert_nr;
271 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
272 int extent_tree_prealloc_nr;
275 struct btrfs_transaction *running_transaction;
276 struct btrfs_super_block *disk_super;
277 struct buffer_head *sb_buffer;
278 struct super_block *sb;
279 struct inode *btree_inode;
280 struct mutex trans_mutex;
281 struct mutex fs_mutex;
282 struct list_head trans_list;
283 struct crypto_hash *hash_tfm;
284 spinlock_t hash_lock;
290 * in ram representation of the tree. extent_root is used for all allocations
291 * and for the extent tree extent_root root.
294 struct buffer_head *node;
295 struct buffer_head *commit_root;
296 struct btrfs_root_item root_item;
297 struct btrfs_key root_key;
298 struct btrfs_fs_info *fs_info;
306 u64 last_inode_alloc;
309 /* the lower bits in the key flags defines the item type */
310 #define BTRFS_KEY_TYPE_MAX 256
311 #define BTRFS_KEY_TYPE_SHIFT 24
312 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
313 BTRFS_KEY_TYPE_SHIFT)
316 * inode items have the data typically returned from stat and store other
317 * info about object characteristics. There is one for every file and dir in
320 #define BTRFS_INODE_ITEM_KEY 1
322 /* reserve 2-15 close to the inode for later flexibility */
325 * dir items are the name -> inode pointers in a directory. There is one
326 * for every name in a directory.
328 #define BTRFS_DIR_ITEM_KEY 16
329 #define BTRFS_DIR_INDEX_KEY 17
331 * extent data is for file data
333 #define BTRFS_EXTENT_DATA_KEY 18
335 * csum items have the checksums for data in the extents
337 #define BTRFS_CSUM_ITEM_KEY 19
339 /* reserve 20-31 for other file stuff */
342 * root items point to tree roots. There are typically in the root
343 * tree used by the super block to find all the other trees
345 #define BTRFS_ROOT_ITEM_KEY 32
347 * extent items are in the extent map tree. These record which blocks
348 * are used, and how many references there are to each block
350 #define BTRFS_EXTENT_ITEM_KEY 33
353 * block groups give us hints into the extent allocation trees. Which
354 * blocks are free etc etc
356 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
359 * dev items list the devices that make up the FS
361 #define BTRFS_DEV_ITEM_KEY 35
364 * string items are for debugging. They just store a short string of
367 #define BTRFS_STRING_ITEM_KEY 253
370 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
372 return le64_to_cpu(bi->used);
375 static inline void btrfs_set_block_group_used(struct
376 btrfs_block_group_item *bi,
379 bi->used = cpu_to_le64(val);
382 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
384 return le64_to_cpu(i->generation);
387 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
390 i->generation = cpu_to_le64(val);
393 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
395 return le64_to_cpu(i->size);
398 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
400 i->size = cpu_to_le64(val);
403 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
405 return le64_to_cpu(i->nblocks);
408 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
410 i->nblocks = cpu_to_le64(val);
413 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
415 return le32_to_cpu(i->nlink);
418 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
420 i->nlink = cpu_to_le32(val);
423 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
425 return le32_to_cpu(i->uid);
428 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
430 i->uid = cpu_to_le32(val);
433 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
435 return le32_to_cpu(i->gid);
438 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
440 i->gid = cpu_to_le32(val);
443 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
445 return le32_to_cpu(i->mode);
448 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
450 i->mode = cpu_to_le32(val);
453 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
455 return le32_to_cpu(i->rdev);
458 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
460 i->rdev = cpu_to_le32(val);
463 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
465 return le16_to_cpu(i->flags);
468 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
470 i->flags = cpu_to_le16(val);
473 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
475 return le16_to_cpu(i->compat_flags);
478 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
481 i->compat_flags = cpu_to_le16(val);
484 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
486 return le64_to_cpu(ts->sec);
489 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
492 ts->sec = cpu_to_le64(val);
495 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
497 return le32_to_cpu(ts->nsec);
500 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
503 ts->nsec = cpu_to_le32(val);
506 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
508 return le32_to_cpu(ei->refs);
511 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
513 ei->refs = cpu_to_le32(val);
516 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
518 return le64_to_cpu(ei->owner);
521 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
523 ei->owner = cpu_to_le64(val);
526 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
528 return le64_to_cpu(n->ptrs[nr].blockptr);
532 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
535 n->ptrs[nr].blockptr = cpu_to_le64(val);
538 static inline u32 btrfs_item_offset(struct btrfs_item *item)
540 return le32_to_cpu(item->offset);
543 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
545 item->offset = cpu_to_le32(val);
548 static inline u32 btrfs_item_end(struct btrfs_item *item)
550 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
553 static inline u16 btrfs_item_size(struct btrfs_item *item)
555 return le16_to_cpu(item->size);
558 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
560 item->size = cpu_to_le16(val);
563 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
565 return le16_to_cpu(d->flags);
568 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
570 d->flags = cpu_to_le16(val);
573 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
578 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
583 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
585 return le16_to_cpu(d->name_len);
588 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
590 d->name_len = cpu_to_le16(val);
593 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
594 struct btrfs_disk_key *disk)
596 cpu->offset = le64_to_cpu(disk->offset);
597 cpu->flags = le32_to_cpu(disk->flags);
598 cpu->objectid = le64_to_cpu(disk->objectid);
601 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
602 struct btrfs_key *cpu)
604 disk->offset = cpu_to_le64(cpu->offset);
605 disk->flags = cpu_to_le32(cpu->flags);
606 disk->objectid = cpu_to_le64(cpu->objectid);
609 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
611 return le64_to_cpu(disk->objectid);
614 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
617 disk->objectid = cpu_to_le64(val);
620 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
622 return le64_to_cpu(disk->offset);
625 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
628 disk->offset = cpu_to_le64(val);
631 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
633 return le32_to_cpu(disk->flags);
636 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
639 disk->flags = cpu_to_le32(val);
642 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
644 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
647 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
650 u32 flags = btrfs_disk_key_flags(key);
651 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
652 val = val << BTRFS_KEY_TYPE_SHIFT;
653 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
654 btrfs_set_disk_key_flags(key, flags);
657 static inline u32 btrfs_key_type(struct btrfs_key *key)
659 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
662 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
664 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
665 val = val << BTRFS_KEY_TYPE_SHIFT;
666 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
669 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
671 return le64_to_cpu(h->blocknr);
674 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
676 h->blocknr = cpu_to_le64(blocknr);
679 static inline u64 btrfs_header_generation(struct btrfs_header *h)
681 return le64_to_cpu(h->generation);
684 static inline void btrfs_set_header_generation(struct btrfs_header *h,
687 h->generation = cpu_to_le64(val);
690 static inline u64 btrfs_header_owner(struct btrfs_header *h)
692 return le64_to_cpu(h->owner);
695 static inline void btrfs_set_header_owner(struct btrfs_header *h,
698 h->owner = cpu_to_le64(val);
701 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
703 return le16_to_cpu(h->nritems);
706 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
708 h->nritems = cpu_to_le16(val);
711 static inline u16 btrfs_header_flags(struct btrfs_header *h)
713 return le16_to_cpu(h->flags);
716 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
718 h->flags = cpu_to_le16(val);
721 static inline int btrfs_header_level(struct btrfs_header *h)
726 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
728 BUG_ON(level > BTRFS_MAX_LEVEL);
732 static inline int btrfs_is_leaf(struct btrfs_node *n)
734 return (btrfs_header_level(&n->header) == 0);
737 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
739 return le64_to_cpu(item->blocknr);
742 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
744 item->blocknr = cpu_to_le64(val);
747 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
749 return le64_to_cpu(item->root_dirid);
752 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
754 item->root_dirid = cpu_to_le64(val);
757 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
759 return le32_to_cpu(item->refs);
762 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
764 item->refs = cpu_to_le32(val);
767 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
769 return le64_to_cpu(s->blocknr);
772 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
774 s->blocknr = cpu_to_le64(val);
777 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
779 return le64_to_cpu(s->generation);
782 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
785 s->generation = cpu_to_le64(val);
788 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
790 return le64_to_cpu(s->root);
793 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
795 s->root = cpu_to_le64(val);
798 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
800 return le64_to_cpu(s->total_blocks);
803 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
806 s->total_blocks = cpu_to_le64(val);
809 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
811 return le64_to_cpu(s->blocks_used);
814 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
817 s->blocks_used = cpu_to_le64(val);
820 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
822 return le32_to_cpu(s->blocksize);
825 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
828 s->blocksize = cpu_to_le32(val);
831 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
833 return le64_to_cpu(s->root_dir_objectid);
836 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
839 s->root_dir_objectid = cpu_to_le64(val);
842 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
844 return le64_to_cpu(s->last_device_id);
847 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
850 s->last_device_id = cpu_to_le64(val);
853 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
855 return le64_to_cpu(s->device_id);
858 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
861 s->device_id = cpu_to_le64(val);
864 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
866 return le64_to_cpu(s->device_block_start);
869 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
872 s->device_block_start = cpu_to_le64(val);
875 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
877 return le64_to_cpu(s->device_num_blocks);
880 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
883 s->device_num_blocks = cpu_to_le64(val);
886 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
888 return le64_to_cpu(s->device_root);
891 static inline void btrfs_set_super_device_root(struct btrfs_super_block
894 s->device_root = cpu_to_le64(val);
898 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
900 return (u8 *)l->items;
903 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
907 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
913 static inline char *btrfs_file_extent_inline_start(struct
914 btrfs_file_extent_item *e)
916 return (char *)(&e->disk_blocknr);
919 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
921 return (unsigned long)(&((struct
922 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
925 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
927 struct btrfs_file_extent_item *fe = NULL;
928 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
931 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
934 return le64_to_cpu(e->disk_blocknr);
937 static inline void btrfs_set_file_extent_disk_blocknr(struct
938 btrfs_file_extent_item
941 e->disk_blocknr = cpu_to_le64(val);
944 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
946 return le64_to_cpu(e->generation);
949 static inline void btrfs_set_file_extent_generation(struct
950 btrfs_file_extent_item *e,
953 e->generation = cpu_to_le64(val);
956 static inline u64 btrfs_file_extent_disk_num_blocks(struct
957 btrfs_file_extent_item *e)
959 return le64_to_cpu(e->disk_num_blocks);
962 static inline void btrfs_set_file_extent_disk_num_blocks(struct
963 btrfs_file_extent_item
966 e->disk_num_blocks = cpu_to_le64(val);
969 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
971 return le64_to_cpu(e->offset);
974 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
977 e->offset = cpu_to_le64(val);
980 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
983 return le64_to_cpu(e->num_blocks);
986 static inline void btrfs_set_file_extent_num_blocks(struct
987 btrfs_file_extent_item *e,
990 e->num_blocks = cpu_to_le64(val);
993 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
995 return le16_to_cpu(d->pathlen);
998 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
1001 d->pathlen = cpu_to_le16(val);
1004 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
1006 return le64_to_cpu(d->device_id);
1009 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
1012 d->device_id = cpu_to_le64(val);
1015 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1017 return sb->s_fs_info;
1020 static inline void btrfs_check_bounds(void *vptr, size_t len,
1021 void *vcontainer, size_t container_len)
1024 char *container = vcontainer;
1025 WARN_ON(ptr < container);
1026 WARN_ON(ptr + len > container + container_len);
1029 static inline void btrfs_memcpy(struct btrfs_root *root,
1031 void *dst, const void *src, size_t nr)
1033 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1034 memcpy(dst, src, nr);
1037 static inline void btrfs_memmove(struct btrfs_root *root,
1039 void *dst, void *src, size_t nr)
1041 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1042 memmove(dst, src, nr);
1045 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1047 WARN_ON(!atomic_read(&bh->b_count));
1048 mark_buffer_dirty(bh);
1051 /* helper function to cast into the data area of the leaf. */
1052 #define btrfs_item_ptr(leaf, slot, type) \
1053 ((type *)(btrfs_leaf_data(leaf) + \
1054 btrfs_item_offset((leaf)->items + (slot))))
1057 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1058 struct btrfs_root *root);
1059 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1060 struct btrfs_root *root);
1061 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1062 struct btrfs_root *root, u64 owner,
1063 u64 num_blocks, u64 search_start,
1064 u64 search_end, struct btrfs_key *ins);
1065 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1066 struct buffer_head *buf);
1067 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1068 *root, u64 blocknr, u64 num_blocks, int pin);
1069 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1071 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1072 struct btrfs_root *root,
1073 u64 blocknr, u64 num_blocks);
1074 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1075 struct btrfs_root *root);
1076 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1077 int btrfs_read_block_groups(struct btrfs_root *root);
1079 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1080 *root, struct btrfs_path *path, u32 data_size);
1081 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1082 struct btrfs_root *root,
1083 struct btrfs_path *path,
1085 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1086 *root, struct btrfs_key *key, struct btrfs_path *p, int
1088 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1089 struct btrfs_path *btrfs_alloc_path(void);
1090 void btrfs_free_path(struct btrfs_path *p);
1091 void btrfs_init_path(struct btrfs_path *p);
1092 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1093 struct btrfs_path *path);
1094 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1095 *root, struct btrfs_key *key, void *data, u32 data_size);
1096 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1097 *root, struct btrfs_path *path, struct btrfs_key
1098 *cpu_key, u32 data_size);
1099 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1100 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1101 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1102 *root, struct buffer_head *snap);
1104 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1105 struct btrfs_key *key);
1106 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1107 *root, struct btrfs_key *key, struct btrfs_root_item
1109 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1110 *root, struct btrfs_key *key, struct btrfs_root_item
1112 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1113 btrfs_root_item *item, struct btrfs_key *key);
1115 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1116 *root, const char *name, int name_len, u64 dir,
1117 struct btrfs_key *location, u8 type);
1118 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1119 struct btrfs_root *root,
1120 struct btrfs_path *path, u64 dir,
1121 const char *name, int name_len,
1123 struct btrfs_dir_item *
1124 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1125 struct btrfs_root *root,
1126 struct btrfs_path *path, u64 dir,
1127 u64 objectid, const char *name, int name_len,
1129 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1130 struct btrfs_path *path,
1131 const char *name, int name_len);
1132 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1133 struct btrfs_root *root,
1134 struct btrfs_path *path,
1135 struct btrfs_dir_item *di);
1137 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1138 struct btrfs_root *fs_root,
1139 u64 dirid, u64 *objectid);
1140 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1143 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1144 *root, u64 objectid, struct btrfs_inode_item
1146 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1147 *root, struct btrfs_path *path,
1148 struct btrfs_key *location, int mod);
1151 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1152 struct btrfs_root *root,
1153 u64 objectid, u64 pos, u64 offset,
1155 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1156 struct btrfs_root *root,
1157 struct btrfs_path *path, u64 objectid,
1158 u64 blocknr, int mod);
1159 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1160 struct btrfs_root *root,
1161 u64 objectid, u64 offset,
1162 char *data, size_t len);
1163 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1164 u64 objectid, u64 offset,
1165 char *data, size_t len);
1166 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1167 struct btrfs_root *root,
1168 struct btrfs_path *path,
1169 u64 objectid, u64 offset,
1172 extern struct subsystem btrfs_subsys;