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 {
185 struct btrfs_inode_timespec atime;
186 struct btrfs_inode_timespec ctime;
187 struct btrfs_inode_timespec mtime;
188 struct btrfs_inode_timespec otime;
189 } __attribute__ ((__packed__));
191 struct btrfs_dir_item {
192 struct btrfs_disk_key location;
196 } __attribute__ ((__packed__));
198 struct btrfs_root_item {
199 struct btrfs_inode_item inode;
206 } __attribute__ ((__packed__));
208 #define BTRFS_FILE_EXTENT_REG 0
209 #define BTRFS_FILE_EXTENT_INLINE 1
211 struct btrfs_file_extent_item {
215 * disk space consumed by the extent, checksum blocks are included
219 __le64 disk_num_blocks;
221 * the logical offset in file blocks (no csums)
222 * this extent record is for. This allows a file extent to point
223 * into the middle of an existing extent on disk, sharing it
224 * between two snapshots (useful if some bytes in the middle of the
225 * extent have changed
229 * the logical number of file blocks (no csums included)
232 } __attribute__ ((__packed__));
234 struct btrfs_csum_item {
235 u8 csum[BTRFS_CSUM_SIZE];
236 } __attribute__ ((__packed__));
238 struct btrfs_device_item {
241 } __attribute__ ((__packed__));
243 /* tag for the radix tree of block groups in ram */
244 #define BTRFS_BLOCK_GROUP_DIRTY 0
245 #define BTRFS_BLOCK_GROUP_AVAIL 1
246 #define BTRFS_BLOCK_GROUP_HINTS 8
247 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
248 struct btrfs_block_group_item {
250 } __attribute__ ((__packed__));
252 struct btrfs_block_group_cache {
253 struct btrfs_key key;
254 struct btrfs_block_group_item item;
260 struct btrfs_fs_info {
261 struct btrfs_root *extent_root;
262 struct btrfs_root *tree_root;
263 struct btrfs_root *dev_root;
264 struct btrfs_block_group_cache *block_group_cache;
265 struct radix_tree_root fs_roots_radix;
266 struct radix_tree_root pending_del_radix;
267 struct radix_tree_root pinned_radix;
268 struct radix_tree_root dev_radix;
269 struct radix_tree_root block_group_radix;
271 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
272 int extent_tree_insert_nr;
273 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
274 int extent_tree_prealloc_nr;
277 struct btrfs_transaction *running_transaction;
278 struct btrfs_super_block *disk_super;
279 struct buffer_head *sb_buffer;
280 struct super_block *sb;
281 struct inode *btree_inode;
282 struct mutex trans_mutex;
283 struct mutex fs_mutex;
284 struct list_head trans_list;
285 struct crypto_hash *hash_tfm;
286 spinlock_t hash_lock;
292 * in ram representation of the tree. extent_root is used for all allocations
293 * and for the extent tree extent_root root.
296 struct buffer_head *node;
297 struct buffer_head *commit_root;
298 struct btrfs_root_item root_item;
299 struct btrfs_key root_key;
300 struct btrfs_fs_info *fs_info;
308 u64 last_inode_alloc;
311 /* the lower bits in the key flags defines the item type */
312 #define BTRFS_KEY_TYPE_MAX 256
313 #define BTRFS_KEY_TYPE_SHIFT 24
314 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
315 BTRFS_KEY_TYPE_SHIFT)
318 * inode items have the data typically returned from stat and store other
319 * info about object characteristics. There is one for every file and dir in
322 #define BTRFS_INODE_ITEM_KEY 1
324 /* reserve 2-15 close to the inode for later flexibility */
327 * dir items are the name -> inode pointers in a directory. There is one
328 * for every name in a directory.
330 #define BTRFS_DIR_ITEM_KEY 16
331 #define BTRFS_DIR_INDEX_KEY 17
333 * extent data is for file data
335 #define BTRFS_EXTENT_DATA_KEY 18
337 * csum items have the checksums for data in the extents
339 #define BTRFS_CSUM_ITEM_KEY 19
341 /* reserve 20-31 for other file stuff */
344 * root items point to tree roots. There are typically in the root
345 * tree used by the super block to find all the other trees
347 #define BTRFS_ROOT_ITEM_KEY 32
349 * extent items are in the extent map tree. These record which blocks
350 * are used, and how many references there are to each block
352 #define BTRFS_EXTENT_ITEM_KEY 33
355 * block groups give us hints into the extent allocation trees. Which
356 * blocks are free etc etc
358 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
361 * dev items list the devices that make up the FS
363 #define BTRFS_DEV_ITEM_KEY 35
366 * string items are for debugging. They just store a short string of
369 #define BTRFS_STRING_ITEM_KEY 253
372 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
374 return le64_to_cpu(bi->used);
377 static inline void btrfs_set_block_group_used(struct
378 btrfs_block_group_item *bi,
381 bi->used = cpu_to_le64(val);
384 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
386 return le64_to_cpu(i->generation);
389 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
392 i->generation = cpu_to_le64(val);
395 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
397 return le64_to_cpu(i->size);
400 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
402 i->size = cpu_to_le64(val);
405 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
407 return le64_to_cpu(i->nblocks);
410 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
412 i->nblocks = cpu_to_le64(val);
415 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
417 return le64_to_cpu(i->block_group);
420 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
423 i->block_group = cpu_to_le64(val);
426 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
428 return le32_to_cpu(i->nlink);
431 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
433 i->nlink = cpu_to_le32(val);
436 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
438 return le32_to_cpu(i->uid);
441 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
443 i->uid = cpu_to_le32(val);
446 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
448 return le32_to_cpu(i->gid);
451 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
453 i->gid = cpu_to_le32(val);
456 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
458 return le32_to_cpu(i->mode);
461 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
463 i->mode = cpu_to_le32(val);
466 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
468 return le32_to_cpu(i->rdev);
471 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
473 i->rdev = cpu_to_le32(val);
476 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
478 return le16_to_cpu(i->flags);
481 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
483 i->flags = cpu_to_le16(val);
486 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
488 return le16_to_cpu(i->compat_flags);
491 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
494 i->compat_flags = cpu_to_le16(val);
497 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
499 return le64_to_cpu(ts->sec);
502 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
505 ts->sec = cpu_to_le64(val);
508 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
510 return le32_to_cpu(ts->nsec);
513 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
516 ts->nsec = cpu_to_le32(val);
519 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
521 return le32_to_cpu(ei->refs);
524 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
526 ei->refs = cpu_to_le32(val);
529 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
531 return le64_to_cpu(ei->owner);
534 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
536 ei->owner = cpu_to_le64(val);
539 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
541 return le64_to_cpu(n->ptrs[nr].blockptr);
545 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
548 n->ptrs[nr].blockptr = cpu_to_le64(val);
551 static inline u32 btrfs_item_offset(struct btrfs_item *item)
553 return le32_to_cpu(item->offset);
556 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
558 item->offset = cpu_to_le32(val);
561 static inline u32 btrfs_item_end(struct btrfs_item *item)
563 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
566 static inline u16 btrfs_item_size(struct btrfs_item *item)
568 return le16_to_cpu(item->size);
571 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
573 item->size = cpu_to_le16(val);
576 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
578 return le16_to_cpu(d->flags);
581 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
583 d->flags = cpu_to_le16(val);
586 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
591 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
596 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
598 return le16_to_cpu(d->name_len);
601 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
603 d->name_len = cpu_to_le16(val);
606 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
607 struct btrfs_disk_key *disk)
609 cpu->offset = le64_to_cpu(disk->offset);
610 cpu->flags = le32_to_cpu(disk->flags);
611 cpu->objectid = le64_to_cpu(disk->objectid);
614 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
615 struct btrfs_key *cpu)
617 disk->offset = cpu_to_le64(cpu->offset);
618 disk->flags = cpu_to_le32(cpu->flags);
619 disk->objectid = cpu_to_le64(cpu->objectid);
622 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
624 return le64_to_cpu(disk->objectid);
627 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
630 disk->objectid = cpu_to_le64(val);
633 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
635 return le64_to_cpu(disk->offset);
638 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
641 disk->offset = cpu_to_le64(val);
644 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
646 return le32_to_cpu(disk->flags);
649 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
652 disk->flags = cpu_to_le32(val);
655 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
657 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
660 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
663 u32 flags = btrfs_disk_key_flags(key);
664 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
665 val = val << BTRFS_KEY_TYPE_SHIFT;
666 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
667 btrfs_set_disk_key_flags(key, flags);
670 static inline u32 btrfs_key_type(struct btrfs_key *key)
672 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
675 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
677 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
678 val = val << BTRFS_KEY_TYPE_SHIFT;
679 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
682 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
684 return le64_to_cpu(h->blocknr);
687 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
689 h->blocknr = cpu_to_le64(blocknr);
692 static inline u64 btrfs_header_generation(struct btrfs_header *h)
694 return le64_to_cpu(h->generation);
697 static inline void btrfs_set_header_generation(struct btrfs_header *h,
700 h->generation = cpu_to_le64(val);
703 static inline u64 btrfs_header_owner(struct btrfs_header *h)
705 return le64_to_cpu(h->owner);
708 static inline void btrfs_set_header_owner(struct btrfs_header *h,
711 h->owner = cpu_to_le64(val);
714 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
716 return le16_to_cpu(h->nritems);
719 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
721 h->nritems = cpu_to_le16(val);
724 static inline u16 btrfs_header_flags(struct btrfs_header *h)
726 return le16_to_cpu(h->flags);
729 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
731 h->flags = cpu_to_le16(val);
734 static inline int btrfs_header_level(struct btrfs_header *h)
739 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
741 BUG_ON(level > BTRFS_MAX_LEVEL);
745 static inline int btrfs_is_leaf(struct btrfs_node *n)
747 return (btrfs_header_level(&n->header) == 0);
750 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
752 return le64_to_cpu(item->blocknr);
755 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
757 item->blocknr = cpu_to_le64(val);
760 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
762 return le64_to_cpu(item->root_dirid);
765 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
767 item->root_dirid = cpu_to_le64(val);
770 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
772 return le32_to_cpu(item->refs);
775 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
777 item->refs = cpu_to_le32(val);
780 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
782 return le64_to_cpu(s->blocknr);
785 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
787 s->blocknr = cpu_to_le64(val);
790 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
792 return le64_to_cpu(s->generation);
795 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
798 s->generation = cpu_to_le64(val);
801 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
803 return le64_to_cpu(s->root);
806 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
808 s->root = cpu_to_le64(val);
811 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
813 return le64_to_cpu(s->total_blocks);
816 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
819 s->total_blocks = cpu_to_le64(val);
822 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
824 return le64_to_cpu(s->blocks_used);
827 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
830 s->blocks_used = cpu_to_le64(val);
833 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
835 return le32_to_cpu(s->blocksize);
838 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
841 s->blocksize = cpu_to_le32(val);
844 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
846 return le64_to_cpu(s->root_dir_objectid);
849 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
852 s->root_dir_objectid = cpu_to_le64(val);
855 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
857 return le64_to_cpu(s->last_device_id);
860 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
863 s->last_device_id = cpu_to_le64(val);
866 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
868 return le64_to_cpu(s->device_id);
871 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
874 s->device_id = cpu_to_le64(val);
877 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
879 return le64_to_cpu(s->device_block_start);
882 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
885 s->device_block_start = cpu_to_le64(val);
888 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
890 return le64_to_cpu(s->device_num_blocks);
893 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
896 s->device_num_blocks = cpu_to_le64(val);
899 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
901 return le64_to_cpu(s->device_root);
904 static inline void btrfs_set_super_device_root(struct btrfs_super_block
907 s->device_root = cpu_to_le64(val);
911 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
913 return (u8 *)l->items;
916 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
920 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
926 static inline char *btrfs_file_extent_inline_start(struct
927 btrfs_file_extent_item *e)
929 return (char *)(&e->disk_blocknr);
932 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
934 return (unsigned long)(&((struct
935 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
938 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
940 struct btrfs_file_extent_item *fe = NULL;
941 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
944 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
947 return le64_to_cpu(e->disk_blocknr);
950 static inline void btrfs_set_file_extent_disk_blocknr(struct
951 btrfs_file_extent_item
954 e->disk_blocknr = cpu_to_le64(val);
957 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
959 return le64_to_cpu(e->generation);
962 static inline void btrfs_set_file_extent_generation(struct
963 btrfs_file_extent_item *e,
966 e->generation = cpu_to_le64(val);
969 static inline u64 btrfs_file_extent_disk_num_blocks(struct
970 btrfs_file_extent_item *e)
972 return le64_to_cpu(e->disk_num_blocks);
975 static inline void btrfs_set_file_extent_disk_num_blocks(struct
976 btrfs_file_extent_item
979 e->disk_num_blocks = cpu_to_le64(val);
982 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
984 return le64_to_cpu(e->offset);
987 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
990 e->offset = cpu_to_le64(val);
993 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
996 return le64_to_cpu(e->num_blocks);
999 static inline void btrfs_set_file_extent_num_blocks(struct
1000 btrfs_file_extent_item *e,
1003 e->num_blocks = cpu_to_le64(val);
1006 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
1008 return le16_to_cpu(d->pathlen);
1011 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
1014 d->pathlen = cpu_to_le16(val);
1017 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
1019 return le64_to_cpu(d->device_id);
1022 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
1025 d->device_id = cpu_to_le64(val);
1028 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1030 return sb->s_fs_info;
1033 static inline void btrfs_check_bounds(void *vptr, size_t len,
1034 void *vcontainer, size_t container_len)
1037 char *container = vcontainer;
1038 WARN_ON(ptr < container);
1039 WARN_ON(ptr + len > container + container_len);
1042 static inline void btrfs_memcpy(struct btrfs_root *root,
1044 void *dst, const void *src, size_t nr)
1046 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1047 memcpy(dst, src, nr);
1050 static inline void btrfs_memmove(struct btrfs_root *root,
1052 void *dst, void *src, size_t nr)
1054 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1055 memmove(dst, src, nr);
1058 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1060 WARN_ON(!atomic_read(&bh->b_count));
1061 mark_buffer_dirty(bh);
1064 /* helper function to cast into the data area of the leaf. */
1065 #define btrfs_item_ptr(leaf, slot, type) \
1066 ((type *)(btrfs_leaf_data(leaf) + \
1067 btrfs_item_offset((leaf)->items + (slot))))
1070 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1071 struct btrfs_block_group_cache
1073 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1074 struct btrfs_root *root);
1075 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1076 struct btrfs_root *root, u64 hint);
1077 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1078 struct btrfs_root *root, u64 owner,
1079 u64 num_blocks, u64 search_start,
1080 u64 search_end, struct btrfs_key *ins);
1081 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1082 struct buffer_head *buf);
1083 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1084 *root, u64 blocknr, u64 num_blocks, int pin);
1085 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1087 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1088 struct btrfs_root *root,
1089 u64 blocknr, u64 num_blocks);
1090 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1091 struct btrfs_root *root);
1092 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1093 int btrfs_read_block_groups(struct btrfs_root *root);
1095 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1096 *root, struct btrfs_path *path, u32 data_size);
1097 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1098 struct btrfs_root *root,
1099 struct btrfs_path *path,
1101 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1102 *root, struct btrfs_key *key, struct btrfs_path *p, int
1104 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1105 struct btrfs_path *btrfs_alloc_path(void);
1106 void btrfs_free_path(struct btrfs_path *p);
1107 void btrfs_init_path(struct btrfs_path *p);
1108 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1109 struct btrfs_path *path);
1110 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1111 *root, struct btrfs_key *key, void *data, u32 data_size);
1112 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1113 *root, struct btrfs_path *path, struct btrfs_key
1114 *cpu_key, u32 data_size);
1115 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1116 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1117 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1118 *root, struct buffer_head *snap);
1120 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1121 struct btrfs_key *key);
1122 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1123 *root, struct btrfs_key *key, struct btrfs_root_item
1125 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1126 *root, struct btrfs_key *key, struct btrfs_root_item
1128 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1129 btrfs_root_item *item, struct btrfs_key *key);
1131 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1132 *root, const char *name, int name_len, u64 dir,
1133 struct btrfs_key *location, u8 type);
1134 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1135 struct btrfs_root *root,
1136 struct btrfs_path *path, u64 dir,
1137 const char *name, int name_len,
1139 struct btrfs_dir_item *
1140 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1141 struct btrfs_root *root,
1142 struct btrfs_path *path, u64 dir,
1143 u64 objectid, const char *name, int name_len,
1145 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1146 struct btrfs_path *path,
1147 const char *name, int name_len);
1148 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1149 struct btrfs_root *root,
1150 struct btrfs_path *path,
1151 struct btrfs_dir_item *di);
1153 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1154 struct btrfs_root *fs_root,
1155 u64 dirid, u64 *objectid);
1156 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1159 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1160 *root, u64 objectid, struct btrfs_inode_item
1162 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1163 *root, struct btrfs_path *path,
1164 struct btrfs_key *location, int mod);
1167 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1168 struct btrfs_root *root,
1169 u64 objectid, u64 pos, u64 offset,
1171 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1172 struct btrfs_root *root,
1173 struct btrfs_path *path, u64 objectid,
1174 u64 blocknr, int mod);
1175 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1176 struct btrfs_root *root,
1177 u64 objectid, u64 offset,
1178 char *data, size_t len);
1179 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1180 u64 objectid, u64 offset,
1181 char *data, size_t len);
1182 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1183 struct btrfs_root *root,
1184 struct btrfs_path *path,
1185 u64 objectid, u64 offset,
1188 extern struct subsystem btrfs_subsys;