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_trans_handle_cachep;
12 extern struct kmem_cache *btrfs_transaction_cachep;
13 extern struct kmem_cache *btrfs_bit_radix_cachep;
14 extern struct kmem_cache *btrfs_path_cachep;
16 #define BTRFS_MAGIC "_BtRfS_M"
18 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
19 #define BTRFS_DEV_TREE_OBJECTID 2ULL
20 #define BTRFS_EXTENT_TREE_OBJECTID 3ULL
21 #define BTRFS_FS_TREE_OBJECTID 4ULL
22 #define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
23 #define BTRFS_FIRST_FREE_OBJECTID 6ULL
26 * we can actually store much bigger names, but lets not confuse the rest
29 #define BTRFS_NAME_LEN 255
31 /* 32 bytes in various csum fields */
32 #define BTRFS_CSUM_SIZE 32
33 /* four bytes for CRC32 */
34 #define BTRFS_CRC32_SIZE 4
35 #define BTRFS_EMPTY_DIR_SIZE 6
38 * the key defines the order in the tree, and so it also defines (optimal)
39 * block layout. objectid corresonds to the inode number. The flags
40 * tells us things about the object, and is a kind of stream selector.
41 * so for a given inode, keys with flags of 1 might refer to the inode
42 * data, flags of 2 may point to file data in the btree and flags == 3
43 * may point to extents.
45 * offset is the starting byte offset for this key in the stream.
47 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
48 * in cpu native order. Otherwise they are identical and their sizes
49 * should be the same (ie both packed)
51 struct btrfs_disk_key {
55 } __attribute__ ((__packed__));
61 } __attribute__ ((__packed__));
64 * every tree block (leaf or node) starts with this header.
67 u8 csum[BTRFS_CSUM_SIZE];
68 u8 fsid[16]; /* FS specific uuid */
69 __le64 blocknr; /* which block this node is supposed to live in */
75 } __attribute__ ((__packed__));
77 #define BTRFS_MAX_LEVEL 8
78 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
79 sizeof(struct btrfs_header)) / \
80 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
81 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
82 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
83 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
84 sizeof(struct btrfs_item) - \
85 sizeof(struct btrfs_file_extent_item))
89 * the super block basically lists the main trees of the FS
90 * it currently lacks any block count etc etc
92 struct btrfs_super_block {
93 u8 csum[BTRFS_CSUM_SIZE];
94 /* the first 3 fields must match struct btrfs_header */
95 u8 fsid[16]; /* FS specific uuid */
96 __le64 blocknr; /* this block number */
103 __le64 root_dir_objectid;
104 __le64 last_device_id;
105 /* fields below here vary with the underlying disk */
106 __le64 device_block_start;
107 __le64 device_num_blocks;
110 } __attribute__ ((__packed__));
113 * A leaf is full of items. offset and size tell us where to find
114 * the item in the leaf (relative to the start of the data area)
117 struct btrfs_disk_key key;
120 } __attribute__ ((__packed__));
123 * leaves have an item area and a data area:
124 * [item0, item1....itemN] [free space] [dataN...data1, data0]
126 * The data is separate from the items to get the keys closer together
130 struct btrfs_header header;
131 struct btrfs_item items[];
132 } __attribute__ ((__packed__));
135 * all non-leaf blocks are nodes, they hold only keys and pointers to
138 struct btrfs_key_ptr {
139 struct btrfs_disk_key key;
141 } __attribute__ ((__packed__));
144 struct btrfs_header header;
145 struct btrfs_key_ptr ptrs[];
146 } __attribute__ ((__packed__));
149 * btrfs_paths remember the path taken from the root down to the leaf.
150 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
151 * to any other levels that are present.
153 * The slots array records the index of the item or block pointer
154 * used while walking the tree.
157 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
158 int slots[BTRFS_MAX_LEVEL];
162 * items in the extent btree are used to record the objectid of the
163 * owner of the block and the number of references
165 struct btrfs_extent_item {
168 } __attribute__ ((__packed__));
170 struct btrfs_inode_timespec {
173 } __attribute__ ((__packed__));
176 * there is no padding here on purpose. If you want to extent the inode,
177 * make a new item type
179 struct btrfs_inode_item {
191 struct btrfs_inode_timespec atime;
192 struct btrfs_inode_timespec ctime;
193 struct btrfs_inode_timespec mtime;
194 struct btrfs_inode_timespec otime;
195 } __attribute__ ((__packed__));
197 struct btrfs_dir_item {
198 struct btrfs_disk_key location;
202 } __attribute__ ((__packed__));
204 struct btrfs_root_item {
205 struct btrfs_inode_item inode;
212 } __attribute__ ((__packed__));
214 #define BTRFS_FILE_EXTENT_REG 0
215 #define BTRFS_FILE_EXTENT_INLINE 1
217 struct btrfs_file_extent_item {
221 * disk space consumed by the extent, checksum blocks are included
225 __le64 disk_num_blocks;
227 * the logical offset in file blocks (no csums)
228 * this extent record is for. This allows a file extent to point
229 * into the middle of an existing extent on disk, sharing it
230 * between two snapshots (useful if some bytes in the middle of the
231 * extent have changed
235 * the logical number of file blocks (no csums included)
238 } __attribute__ ((__packed__));
240 struct btrfs_csum_item {
242 } __attribute__ ((__packed__));
244 struct btrfs_device_item {
247 } __attribute__ ((__packed__));
249 /* tag for the radix tree of block groups in ram */
250 #define BTRFS_BLOCK_GROUP_DIRTY 0
251 #define BTRFS_BLOCK_GROUP_AVAIL 1
252 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
255 #define BTRFS_BLOCK_GROUP_DATA 1
256 struct btrfs_block_group_item {
259 } __attribute__ ((__packed__));
261 struct btrfs_block_group_cache {
262 struct btrfs_key key;
263 struct btrfs_block_group_item item;
264 struct radix_tree_root *radix;
274 struct btrfs_fs_info {
275 struct btrfs_root *extent_root;
276 struct btrfs_root *tree_root;
277 struct btrfs_root *dev_root;
278 struct radix_tree_root fs_roots_radix;
279 struct radix_tree_root pending_del_radix;
280 struct radix_tree_root pinned_radix;
281 struct radix_tree_root dev_radix;
282 struct radix_tree_root block_group_radix;
283 struct radix_tree_root block_group_data_radix;
284 struct radix_tree_root extent_map_radix;
286 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
287 int extent_tree_insert_nr;
288 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
289 int extent_tree_prealloc_nr;
292 struct btrfs_transaction *running_transaction;
293 struct btrfs_super_block *disk_super;
294 struct buffer_head *sb_buffer;
295 struct super_block *sb;
296 struct inode *btree_inode;
297 struct mutex trans_mutex;
298 struct mutex fs_mutex;
299 struct list_head trans_list;
300 struct crypto_hash *hash_tfm;
301 spinlock_t hash_lock;
307 * in ram representation of the tree. extent_root is used for all allocations
308 * and for the extent tree extent_root root.
311 struct buffer_head *node;
312 struct buffer_head *commit_root;
313 struct btrfs_root_item root_item;
314 struct btrfs_key root_key;
315 struct btrfs_fs_info *fs_info;
323 u64 last_inode_alloc;
326 /* the lower bits in the key flags defines the item type */
327 #define BTRFS_KEY_TYPE_MAX 256
328 #define BTRFS_KEY_TYPE_SHIFT 24
329 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
330 BTRFS_KEY_TYPE_SHIFT)
333 * inode items have the data typically returned from stat and store other
334 * info about object characteristics. There is one for every file and dir in
337 #define BTRFS_INODE_ITEM_KEY 1
339 /* reserve 2-15 close to the inode for later flexibility */
342 * dir items are the name -> inode pointers in a directory. There is one
343 * for every name in a directory.
345 #define BTRFS_DIR_ITEM_KEY 16
346 #define BTRFS_DIR_INDEX_KEY 17
348 * extent data is for file data
350 #define BTRFS_EXTENT_DATA_KEY 18
352 * csum items have the checksums for data in the extents
354 #define BTRFS_CSUM_ITEM_KEY 19
356 /* reserve 20-31 for other file stuff */
359 * root items point to tree roots. There are typically in the root
360 * tree used by the super block to find all the other trees
362 #define BTRFS_ROOT_ITEM_KEY 32
364 * extent items are in the extent map tree. These record which blocks
365 * are used, and how many references there are to each block
367 #define BTRFS_EXTENT_ITEM_KEY 33
370 * block groups give us hints into the extent allocation trees. Which
371 * blocks are free etc etc
373 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
376 * dev items list the devices that make up the FS
378 #define BTRFS_DEV_ITEM_KEY 35
381 * string items are for debugging. They just store a short string of
384 #define BTRFS_STRING_ITEM_KEY 253
387 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
389 return le64_to_cpu(bi->used);
392 static inline void btrfs_set_block_group_used(struct
393 btrfs_block_group_item *bi,
396 bi->used = cpu_to_le64(val);
399 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
401 return le64_to_cpu(i->generation);
404 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
407 i->generation = cpu_to_le64(val);
410 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
412 return le64_to_cpu(i->size);
415 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
417 i->size = cpu_to_le64(val);
420 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
422 return le64_to_cpu(i->nblocks);
425 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
427 i->nblocks = cpu_to_le64(val);
430 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
432 return le64_to_cpu(i->block_group);
435 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
438 i->block_group = cpu_to_le64(val);
441 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
443 return le32_to_cpu(i->nlink);
446 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
448 i->nlink = cpu_to_le32(val);
451 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
453 return le32_to_cpu(i->uid);
456 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
458 i->uid = cpu_to_le32(val);
461 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
463 return le32_to_cpu(i->gid);
466 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
468 i->gid = cpu_to_le32(val);
471 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
473 return le32_to_cpu(i->mode);
476 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
478 i->mode = cpu_to_le32(val);
481 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
483 return le32_to_cpu(i->rdev);
486 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
488 i->rdev = cpu_to_le32(val);
491 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
493 return le16_to_cpu(i->flags);
496 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
498 i->flags = cpu_to_le16(val);
501 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
503 return le16_to_cpu(i->compat_flags);
506 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
509 i->compat_flags = cpu_to_le16(val);
512 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
514 return le64_to_cpu(ts->sec);
517 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
520 ts->sec = cpu_to_le64(val);
523 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
525 return le32_to_cpu(ts->nsec);
528 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
531 ts->nsec = cpu_to_le32(val);
534 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
536 return le32_to_cpu(ei->refs);
539 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
541 ei->refs = cpu_to_le32(val);
544 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
546 return le64_to_cpu(ei->owner);
549 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
551 ei->owner = cpu_to_le64(val);
554 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
556 return le64_to_cpu(n->ptrs[nr].blockptr);
560 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
563 n->ptrs[nr].blockptr = cpu_to_le64(val);
566 static inline u32 btrfs_item_offset(struct btrfs_item *item)
568 return le32_to_cpu(item->offset);
571 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
573 item->offset = cpu_to_le32(val);
576 static inline u32 btrfs_item_end(struct btrfs_item *item)
578 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
581 static inline u16 btrfs_item_size(struct btrfs_item *item)
583 return le16_to_cpu(item->size);
586 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
588 item->size = cpu_to_le16(val);
591 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
593 return le16_to_cpu(d->flags);
596 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
598 d->flags = cpu_to_le16(val);
601 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
606 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
611 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
613 return le16_to_cpu(d->name_len);
616 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
618 d->name_len = cpu_to_le16(val);
621 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
622 struct btrfs_disk_key *disk)
624 cpu->offset = le64_to_cpu(disk->offset);
625 cpu->flags = le32_to_cpu(disk->flags);
626 cpu->objectid = le64_to_cpu(disk->objectid);
629 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
630 struct btrfs_key *cpu)
632 disk->offset = cpu_to_le64(cpu->offset);
633 disk->flags = cpu_to_le32(cpu->flags);
634 disk->objectid = cpu_to_le64(cpu->objectid);
637 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
639 return le64_to_cpu(disk->objectid);
642 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
645 disk->objectid = cpu_to_le64(val);
648 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
650 return le64_to_cpu(disk->offset);
653 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
656 disk->offset = cpu_to_le64(val);
659 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
661 return le32_to_cpu(disk->flags);
664 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
667 disk->flags = cpu_to_le32(val);
670 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
672 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
675 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
678 u32 flags = btrfs_disk_key_flags(key);
679 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
680 val = val << BTRFS_KEY_TYPE_SHIFT;
681 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
682 btrfs_set_disk_key_flags(key, flags);
685 static inline u32 btrfs_key_type(struct btrfs_key *key)
687 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
690 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
692 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
693 val = val << BTRFS_KEY_TYPE_SHIFT;
694 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
697 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
699 return le64_to_cpu(h->blocknr);
702 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
704 h->blocknr = cpu_to_le64(blocknr);
707 static inline u64 btrfs_header_generation(struct btrfs_header *h)
709 return le64_to_cpu(h->generation);
712 static inline void btrfs_set_header_generation(struct btrfs_header *h,
715 h->generation = cpu_to_le64(val);
718 static inline u64 btrfs_header_owner(struct btrfs_header *h)
720 return le64_to_cpu(h->owner);
723 static inline void btrfs_set_header_owner(struct btrfs_header *h,
726 h->owner = cpu_to_le64(val);
729 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
731 return le16_to_cpu(h->nritems);
734 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
736 h->nritems = cpu_to_le16(val);
739 static inline u16 btrfs_header_flags(struct btrfs_header *h)
741 return le16_to_cpu(h->flags);
744 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
746 h->flags = cpu_to_le16(val);
749 static inline int btrfs_header_level(struct btrfs_header *h)
754 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
756 BUG_ON(level > BTRFS_MAX_LEVEL);
760 static inline int btrfs_is_leaf(struct btrfs_node *n)
762 return (btrfs_header_level(&n->header) == 0);
765 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
767 return le64_to_cpu(item->blocknr);
770 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
772 item->blocknr = cpu_to_le64(val);
775 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
777 return le64_to_cpu(item->root_dirid);
780 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
782 item->root_dirid = cpu_to_le64(val);
785 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
787 return le32_to_cpu(item->refs);
790 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
792 item->refs = cpu_to_le32(val);
795 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
797 return le64_to_cpu(s->blocknr);
800 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
802 s->blocknr = cpu_to_le64(val);
805 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
807 return le64_to_cpu(s->generation);
810 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
813 s->generation = cpu_to_le64(val);
816 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
818 return le64_to_cpu(s->root);
821 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
823 s->root = cpu_to_le64(val);
826 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
828 return le64_to_cpu(s->total_blocks);
831 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
834 s->total_blocks = cpu_to_le64(val);
837 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
839 return le64_to_cpu(s->blocks_used);
842 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
845 s->blocks_used = cpu_to_le64(val);
848 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
850 return le32_to_cpu(s->blocksize);
853 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
856 s->blocksize = cpu_to_le32(val);
859 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
861 return le64_to_cpu(s->root_dir_objectid);
864 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
867 s->root_dir_objectid = cpu_to_le64(val);
870 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
872 return le64_to_cpu(s->last_device_id);
875 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
878 s->last_device_id = cpu_to_le64(val);
881 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
883 return le64_to_cpu(s->device_id);
886 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
889 s->device_id = cpu_to_le64(val);
892 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
894 return le64_to_cpu(s->device_block_start);
897 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
900 s->device_block_start = cpu_to_le64(val);
903 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
905 return le64_to_cpu(s->device_num_blocks);
908 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
911 s->device_num_blocks = cpu_to_le64(val);
914 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
916 return le64_to_cpu(s->device_root);
919 static inline void btrfs_set_super_device_root(struct btrfs_super_block
922 s->device_root = cpu_to_le64(val);
926 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
928 return (u8 *)l->items;
931 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
935 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
941 static inline char *btrfs_file_extent_inline_start(struct
942 btrfs_file_extent_item *e)
944 return (char *)(&e->disk_blocknr);
947 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
949 return (unsigned long)(&((struct
950 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
953 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
955 struct btrfs_file_extent_item *fe = NULL;
956 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
959 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
962 return le64_to_cpu(e->disk_blocknr);
965 static inline void btrfs_set_file_extent_disk_blocknr(struct
966 btrfs_file_extent_item
969 e->disk_blocknr = cpu_to_le64(val);
972 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
974 return le64_to_cpu(e->generation);
977 static inline void btrfs_set_file_extent_generation(struct
978 btrfs_file_extent_item *e,
981 e->generation = cpu_to_le64(val);
984 static inline u64 btrfs_file_extent_disk_num_blocks(struct
985 btrfs_file_extent_item *e)
987 return le64_to_cpu(e->disk_num_blocks);
990 static inline void btrfs_set_file_extent_disk_num_blocks(struct
991 btrfs_file_extent_item
994 e->disk_num_blocks = cpu_to_le64(val);
997 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
999 return le64_to_cpu(e->offset);
1002 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
1005 e->offset = cpu_to_le64(val);
1008 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
1011 return le64_to_cpu(e->num_blocks);
1014 static inline void btrfs_set_file_extent_num_blocks(struct
1015 btrfs_file_extent_item *e,
1018 e->num_blocks = cpu_to_le64(val);
1021 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
1023 return le16_to_cpu(d->pathlen);
1026 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
1029 d->pathlen = cpu_to_le16(val);
1032 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
1034 return le64_to_cpu(d->device_id);
1037 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
1040 d->device_id = cpu_to_le64(val);
1043 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1045 return sb->s_fs_info;
1048 static inline void btrfs_check_bounds(void *vptr, size_t len,
1049 void *vcontainer, size_t container_len)
1052 char *container = vcontainer;
1053 WARN_ON(ptr < container);
1054 WARN_ON(ptr + len > container + container_len);
1057 static inline void btrfs_memcpy(struct btrfs_root *root,
1059 void *dst, const void *src, size_t nr)
1061 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1062 memcpy(dst, src, nr);
1065 static inline void btrfs_memmove(struct btrfs_root *root,
1067 void *dst, void *src, size_t nr)
1069 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1070 memmove(dst, src, nr);
1073 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1075 WARN_ON(!atomic_read(&bh->b_count));
1076 mark_buffer_dirty(bh);
1079 /* helper function to cast into the data area of the leaf. */
1080 #define btrfs_item_ptr(leaf, slot, type) \
1081 ((type *)(btrfs_leaf_data(leaf) + \
1082 btrfs_item_offset((leaf)->items + (slot))))
1085 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1086 struct btrfs_block_group_cache
1087 *hint, u64 search_start,
1088 int data, int owner);
1089 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1090 struct btrfs_root *root);
1091 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1092 struct btrfs_root *root, u64 hint);
1093 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1094 struct btrfs_root *root, u64 owner,
1095 u64 num_blocks, u64 search_start,
1096 u64 search_end, struct btrfs_key *ins, int data);
1097 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1098 struct buffer_head *buf);
1099 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1100 *root, u64 blocknr, u64 num_blocks, int pin);
1101 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1103 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1104 struct btrfs_root *root,
1105 u64 blocknr, u64 num_blocks);
1106 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1107 struct btrfs_root *root);
1108 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1109 int btrfs_read_block_groups(struct btrfs_root *root);
1111 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1112 *root, struct btrfs_path *path, u32 data_size);
1113 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1114 struct btrfs_root *root,
1115 struct btrfs_path *path,
1117 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1118 *root, struct btrfs_key *key, struct btrfs_path *p, int
1120 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1121 struct btrfs_path *btrfs_alloc_path(void);
1122 void btrfs_free_path(struct btrfs_path *p);
1123 void btrfs_init_path(struct btrfs_path *p);
1124 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1125 struct btrfs_path *path);
1126 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1127 *root, struct btrfs_key *key, void *data, u32 data_size);
1128 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1129 *root, struct btrfs_path *path, struct btrfs_key
1130 *cpu_key, u32 data_size);
1131 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1132 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1133 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1134 *root, struct buffer_head *snap);
1136 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1137 struct btrfs_key *key);
1138 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1139 *root, struct btrfs_key *key, struct btrfs_root_item
1141 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1142 *root, struct btrfs_key *key, struct btrfs_root_item
1144 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1145 btrfs_root_item *item, struct btrfs_key *key);
1147 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1148 *root, const char *name, int name_len, u64 dir,
1149 struct btrfs_key *location, u8 type);
1150 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1151 struct btrfs_root *root,
1152 struct btrfs_path *path, u64 dir,
1153 const char *name, int name_len,
1155 struct btrfs_dir_item *
1156 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1157 struct btrfs_root *root,
1158 struct btrfs_path *path, u64 dir,
1159 u64 objectid, const char *name, int name_len,
1161 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1162 struct btrfs_path *path,
1163 const char *name, int name_len);
1164 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1165 struct btrfs_root *root,
1166 struct btrfs_path *path,
1167 struct btrfs_dir_item *di);
1169 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1170 struct btrfs_root *fs_root,
1171 u64 dirid, u64 *objectid);
1172 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1175 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1176 *root, u64 objectid, struct btrfs_inode_item
1178 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1179 *root, struct btrfs_path *path,
1180 struct btrfs_key *location, int mod);
1183 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1184 struct btrfs_root *root,
1185 u64 objectid, u64 pos, u64 offset,
1186 u64 disk_num_blocks,
1188 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1189 struct btrfs_root *root,
1190 struct btrfs_path *path, u64 objectid,
1191 u64 blocknr, int mod);
1192 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1193 struct btrfs_root *root,
1194 u64 objectid, u64 offset,
1195 char *data, size_t len);
1196 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1197 u64 objectid, u64 offset,
1198 char *data, size_t len);
1199 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1200 struct btrfs_root *root,
1201 struct btrfs_path *path,
1202 u64 objectid, u64 offset,
1204 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1205 struct btrfs_root *root, struct btrfs_path *path,