5 #include <linux/buffer_head.h>
6 #include <linux/workqueue.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
37 #define BTRFS_FT_UNKNOWN 0
38 #define BTRFS_FT_REG_FILE 1
39 #define BTRFS_FT_DIR 2
40 #define BTRFS_FT_CHRDEV 3
41 #define BTRFS_FT_BLKDEV 4
42 #define BTRFS_FT_FIFO 5
43 #define BTRFS_FT_SOCK 6
44 #define BTRFS_FT_SYMLINK 7
45 #define BTRFS_FT_MAX 8
48 * the key defines the order in the tree, and so it also defines (optimal)
49 * block layout. objectid corresonds to the inode number. The flags
50 * tells us things about the object, and is a kind of stream selector.
51 * so for a given inode, keys with flags of 1 might refer to the inode
52 * data, flags of 2 may point to file data in the btree and flags == 3
53 * may point to extents.
55 * offset is the starting byte offset for this key in the stream.
57 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
58 * in cpu native order. Otherwise they are identical and their sizes
59 * should be the same (ie both packed)
61 struct btrfs_disk_key {
65 } __attribute__ ((__packed__));
71 } __attribute__ ((__packed__));
74 * every tree block (leaf or node) starts with this header.
77 u8 csum[BTRFS_CSUM_SIZE];
78 u8 fsid[16]; /* FS specific uuid */
79 __le64 blocknr; /* which block this node is supposed to live in */
85 } __attribute__ ((__packed__));
87 #define BTRFS_MAX_LEVEL 8
88 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
89 sizeof(struct btrfs_header)) / \
90 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
91 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
92 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
93 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
94 sizeof(struct btrfs_item) - \
95 sizeof(struct btrfs_file_extent_item))
99 * the super block basically lists the main trees of the FS
100 * it currently lacks any block count etc etc
102 struct btrfs_super_block {
103 u8 csum[BTRFS_CSUM_SIZE];
104 /* the first 3 fields must match struct btrfs_header */
105 u8 fsid[16]; /* FS specific uuid */
106 __le64 blocknr; /* this block number */
113 __le64 root_dir_objectid;
114 __le64 last_device_id;
115 /* fields below here vary with the underlying disk */
116 __le64 device_block_start;
117 __le64 device_num_blocks;
120 } __attribute__ ((__packed__));
123 * A leaf is full of items. offset and size tell us where to find
124 * the item in the leaf (relative to the start of the data area)
127 struct btrfs_disk_key key;
130 } __attribute__ ((__packed__));
133 * leaves have an item area and a data area:
134 * [item0, item1....itemN] [free space] [dataN...data1, data0]
136 * The data is separate from the items to get the keys closer together
140 struct btrfs_header header;
141 struct btrfs_item items[];
142 } __attribute__ ((__packed__));
145 * all non-leaf blocks are nodes, they hold only keys and pointers to
148 struct btrfs_key_ptr {
149 struct btrfs_disk_key key;
151 } __attribute__ ((__packed__));
154 struct btrfs_header header;
155 struct btrfs_key_ptr ptrs[];
156 } __attribute__ ((__packed__));
159 * btrfs_paths remember the path taken from the root down to the leaf.
160 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
161 * to any other levels that are present.
163 * The slots array records the index of the item or block pointer
164 * used while walking the tree.
167 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
168 int slots[BTRFS_MAX_LEVEL];
172 * items in the extent btree are used to record the objectid of the
173 * owner of the block and the number of references
175 struct btrfs_extent_item {
178 } __attribute__ ((__packed__));
180 struct btrfs_inode_timespec {
183 } __attribute__ ((__packed__));
186 * there is no padding here on purpose. If you want to extent the inode,
187 * make a new item type
189 struct btrfs_inode_item {
201 struct btrfs_inode_timespec atime;
202 struct btrfs_inode_timespec ctime;
203 struct btrfs_inode_timespec mtime;
204 struct btrfs_inode_timespec otime;
205 } __attribute__ ((__packed__));
207 struct btrfs_dir_item {
208 struct btrfs_disk_key location;
212 } __attribute__ ((__packed__));
214 struct btrfs_root_item {
215 struct btrfs_inode_item inode;
222 } __attribute__ ((__packed__));
224 #define BTRFS_FILE_EXTENT_REG 0
225 #define BTRFS_FILE_EXTENT_INLINE 1
227 struct btrfs_file_extent_item {
231 * disk space consumed by the extent, checksum blocks are included
235 __le64 disk_num_blocks;
237 * the logical offset in file blocks (no csums)
238 * this extent record is for. This allows a file extent to point
239 * into the middle of an existing extent on disk, sharing it
240 * between two snapshots (useful if some bytes in the middle of the
241 * extent have changed
245 * the logical number of file blocks (no csums included)
248 } __attribute__ ((__packed__));
250 struct btrfs_csum_item {
252 } __attribute__ ((__packed__));
254 struct btrfs_device_item {
257 } __attribute__ ((__packed__));
259 /* tag for the radix tree of block groups in ram */
260 #define BTRFS_BLOCK_GROUP_DIRTY 0
261 #define BTRFS_BLOCK_GROUP_AVAIL 1
262 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
265 #define BTRFS_BLOCK_GROUP_DATA 1
266 struct btrfs_block_group_item {
269 } __attribute__ ((__packed__));
271 struct btrfs_block_group_cache {
272 struct btrfs_key key;
273 struct btrfs_block_group_item item;
274 struct radix_tree_root *radix;
285 struct btrfs_fs_info {
286 spinlock_t hash_lock;
287 struct btrfs_root *extent_root;
288 struct btrfs_root *tree_root;
289 struct btrfs_root *dev_root;
290 struct radix_tree_root fs_roots_radix;
291 struct radix_tree_root pending_del_radix;
292 struct radix_tree_root pinned_radix;
293 struct radix_tree_root dev_radix;
294 struct radix_tree_root block_group_radix;
295 struct radix_tree_root block_group_data_radix;
296 struct radix_tree_root extent_map_radix;
298 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
299 int extent_tree_insert_nr;
300 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
301 int extent_tree_prealloc_nr;
304 struct btrfs_transaction *running_transaction;
305 struct btrfs_super_block *disk_super;
306 struct buffer_head *sb_buffer;
307 struct super_block *sb;
308 struct inode *btree_inode;
309 struct mutex trans_mutex;
310 struct mutex fs_mutex;
311 struct list_head trans_list;
312 struct list_head dead_roots;
313 struct crypto_hash *hash_tfm;
314 struct delayed_work trans_work;
320 * in ram representation of the tree. extent_root is used for all allocations
321 * and for the extent tree extent_root root.
324 struct buffer_head *node;
325 struct buffer_head *commit_root;
326 struct btrfs_root_item root_item;
327 struct btrfs_key root_key;
328 struct btrfs_fs_info *fs_info;
336 u64 last_inode_alloc;
339 /* the lower bits in the key flags defines the item type */
340 #define BTRFS_KEY_TYPE_MAX 256
341 #define BTRFS_KEY_TYPE_SHIFT 24
342 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
343 BTRFS_KEY_TYPE_SHIFT)
346 * inode items have the data typically returned from stat and store other
347 * info about object characteristics. There is one for every file and dir in
350 #define BTRFS_INODE_ITEM_KEY 1
352 /* reserve 2-15 close to the inode for later flexibility */
355 * dir items are the name -> inode pointers in a directory. There is one
356 * for every name in a directory.
358 #define BTRFS_DIR_ITEM_KEY 16
359 #define BTRFS_DIR_INDEX_KEY 17
361 * extent data is for file data
363 #define BTRFS_EXTENT_DATA_KEY 18
365 * csum items have the checksums for data in the extents
367 #define BTRFS_CSUM_ITEM_KEY 19
369 /* reserve 20-31 for other file stuff */
372 * root items point to tree roots. There are typically in the root
373 * tree used by the super block to find all the other trees
375 #define BTRFS_ROOT_ITEM_KEY 32
377 * extent items are in the extent map tree. These record which blocks
378 * are used, and how many references there are to each block
380 #define BTRFS_EXTENT_ITEM_KEY 33
383 * block groups give us hints into the extent allocation trees. Which
384 * blocks are free etc etc
386 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
389 * dev items list the devices that make up the FS
391 #define BTRFS_DEV_ITEM_KEY 35
394 * string items are for debugging. They just store a short string of
397 #define BTRFS_STRING_ITEM_KEY 253
400 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
402 return le64_to_cpu(bi->used);
405 static inline void btrfs_set_block_group_used(struct
406 btrfs_block_group_item *bi,
409 bi->used = cpu_to_le64(val);
412 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
414 return le64_to_cpu(i->generation);
417 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
420 i->generation = cpu_to_le64(val);
423 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
425 return le64_to_cpu(i->size);
428 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
430 i->size = cpu_to_le64(val);
433 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
435 return le64_to_cpu(i->nblocks);
438 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
440 i->nblocks = cpu_to_le64(val);
443 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
445 return le64_to_cpu(i->block_group);
448 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
451 i->block_group = cpu_to_le64(val);
454 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
456 return le32_to_cpu(i->nlink);
459 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
461 i->nlink = cpu_to_le32(val);
464 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
466 return le32_to_cpu(i->uid);
469 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
471 i->uid = cpu_to_le32(val);
474 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
476 return le32_to_cpu(i->gid);
479 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
481 i->gid = cpu_to_le32(val);
484 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
486 return le32_to_cpu(i->mode);
489 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
491 i->mode = cpu_to_le32(val);
494 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
496 return le32_to_cpu(i->rdev);
499 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
501 i->rdev = cpu_to_le32(val);
504 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
506 return le16_to_cpu(i->flags);
509 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
511 i->flags = cpu_to_le16(val);
514 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
516 return le16_to_cpu(i->compat_flags);
519 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
522 i->compat_flags = cpu_to_le16(val);
525 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
527 return le64_to_cpu(ts->sec);
530 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
533 ts->sec = cpu_to_le64(val);
536 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
538 return le32_to_cpu(ts->nsec);
541 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
544 ts->nsec = cpu_to_le32(val);
547 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
549 return le32_to_cpu(ei->refs);
552 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
554 ei->refs = cpu_to_le32(val);
557 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
559 return le64_to_cpu(ei->owner);
562 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
564 ei->owner = cpu_to_le64(val);
567 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
569 return le64_to_cpu(n->ptrs[nr].blockptr);
573 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
576 n->ptrs[nr].blockptr = cpu_to_le64(val);
579 static inline u32 btrfs_item_offset(struct btrfs_item *item)
581 return le32_to_cpu(item->offset);
584 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
586 item->offset = cpu_to_le32(val);
589 static inline u32 btrfs_item_end(struct btrfs_item *item)
591 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
594 static inline u16 btrfs_item_size(struct btrfs_item *item)
596 return le16_to_cpu(item->size);
599 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
601 item->size = cpu_to_le16(val);
604 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
606 return le16_to_cpu(d->flags);
609 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
611 d->flags = cpu_to_le16(val);
614 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
619 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
624 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
626 return le16_to_cpu(d->name_len);
629 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
631 d->name_len = cpu_to_le16(val);
634 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
635 struct btrfs_disk_key *disk)
637 cpu->offset = le64_to_cpu(disk->offset);
638 cpu->flags = le32_to_cpu(disk->flags);
639 cpu->objectid = le64_to_cpu(disk->objectid);
642 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
643 struct btrfs_key *cpu)
645 disk->offset = cpu_to_le64(cpu->offset);
646 disk->flags = cpu_to_le32(cpu->flags);
647 disk->objectid = cpu_to_le64(cpu->objectid);
650 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
652 return le64_to_cpu(disk->objectid);
655 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
658 disk->objectid = cpu_to_le64(val);
661 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
663 return le64_to_cpu(disk->offset);
666 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
669 disk->offset = cpu_to_le64(val);
672 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
674 return le32_to_cpu(disk->flags);
677 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
680 disk->flags = cpu_to_le32(val);
683 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
685 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
688 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
691 u32 flags = btrfs_disk_key_flags(key);
692 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
693 val = val << BTRFS_KEY_TYPE_SHIFT;
694 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
695 btrfs_set_disk_key_flags(key, flags);
698 static inline u32 btrfs_key_type(struct btrfs_key *key)
700 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
703 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
705 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
706 val = val << BTRFS_KEY_TYPE_SHIFT;
707 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
710 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
712 return le64_to_cpu(h->blocknr);
715 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
717 h->blocknr = cpu_to_le64(blocknr);
720 static inline u64 btrfs_header_generation(struct btrfs_header *h)
722 return le64_to_cpu(h->generation);
725 static inline void btrfs_set_header_generation(struct btrfs_header *h,
728 h->generation = cpu_to_le64(val);
731 static inline u64 btrfs_header_owner(struct btrfs_header *h)
733 return le64_to_cpu(h->owner);
736 static inline void btrfs_set_header_owner(struct btrfs_header *h,
739 h->owner = cpu_to_le64(val);
742 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
744 return le16_to_cpu(h->nritems);
747 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
749 h->nritems = cpu_to_le16(val);
752 static inline u16 btrfs_header_flags(struct btrfs_header *h)
754 return le16_to_cpu(h->flags);
757 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
759 h->flags = cpu_to_le16(val);
762 static inline int btrfs_header_level(struct btrfs_header *h)
767 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
769 BUG_ON(level > BTRFS_MAX_LEVEL);
773 static inline int btrfs_is_leaf(struct btrfs_node *n)
775 return (btrfs_header_level(&n->header) == 0);
778 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
780 return le64_to_cpu(item->blocknr);
783 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
785 item->blocknr = cpu_to_le64(val);
788 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
790 return le64_to_cpu(item->root_dirid);
793 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
795 item->root_dirid = cpu_to_le64(val);
798 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
800 return le32_to_cpu(item->refs);
803 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
805 item->refs = cpu_to_le32(val);
808 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
810 return le64_to_cpu(s->blocknr);
813 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
815 s->blocknr = cpu_to_le64(val);
818 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
820 return le64_to_cpu(s->generation);
823 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
826 s->generation = cpu_to_le64(val);
829 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
831 return le64_to_cpu(s->root);
834 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
836 s->root = cpu_to_le64(val);
839 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
841 return le64_to_cpu(s->total_blocks);
844 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
847 s->total_blocks = cpu_to_le64(val);
850 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
852 return le64_to_cpu(s->blocks_used);
855 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
858 s->blocks_used = cpu_to_le64(val);
861 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
863 return le32_to_cpu(s->blocksize);
866 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
869 s->blocksize = cpu_to_le32(val);
872 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
874 return le64_to_cpu(s->root_dir_objectid);
877 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
880 s->root_dir_objectid = cpu_to_le64(val);
883 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
885 return le64_to_cpu(s->last_device_id);
888 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
891 s->last_device_id = cpu_to_le64(val);
894 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
896 return le64_to_cpu(s->device_id);
899 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
902 s->device_id = cpu_to_le64(val);
905 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
907 return le64_to_cpu(s->device_block_start);
910 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
913 s->device_block_start = cpu_to_le64(val);
916 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
918 return le64_to_cpu(s->device_num_blocks);
921 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
924 s->device_num_blocks = cpu_to_le64(val);
927 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
929 return le64_to_cpu(s->device_root);
932 static inline void btrfs_set_super_device_root(struct btrfs_super_block
935 s->device_root = cpu_to_le64(val);
939 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
941 return (u8 *)l->items;
944 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
948 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
954 static inline char *btrfs_file_extent_inline_start(struct
955 btrfs_file_extent_item *e)
957 return (char *)(&e->disk_blocknr);
960 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
962 return (unsigned long)(&((struct
963 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
966 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
968 struct btrfs_file_extent_item *fe = NULL;
969 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
972 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
975 return le64_to_cpu(e->disk_blocknr);
978 static inline void btrfs_set_file_extent_disk_blocknr(struct
979 btrfs_file_extent_item
982 e->disk_blocknr = cpu_to_le64(val);
985 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
987 return le64_to_cpu(e->generation);
990 static inline void btrfs_set_file_extent_generation(struct
991 btrfs_file_extent_item *e,
994 e->generation = cpu_to_le64(val);
997 static inline u64 btrfs_file_extent_disk_num_blocks(struct
998 btrfs_file_extent_item *e)
1000 return le64_to_cpu(e->disk_num_blocks);
1003 static inline void btrfs_set_file_extent_disk_num_blocks(struct
1004 btrfs_file_extent_item
1007 e->disk_num_blocks = cpu_to_le64(val);
1010 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
1012 return le64_to_cpu(e->offset);
1015 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
1018 e->offset = cpu_to_le64(val);
1021 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
1024 return le64_to_cpu(e->num_blocks);
1027 static inline void btrfs_set_file_extent_num_blocks(struct
1028 btrfs_file_extent_item *e,
1031 e->num_blocks = cpu_to_le64(val);
1034 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
1036 return le16_to_cpu(d->pathlen);
1039 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
1042 d->pathlen = cpu_to_le16(val);
1045 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
1047 return le64_to_cpu(d->device_id);
1050 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
1053 d->device_id = cpu_to_le64(val);
1056 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1058 return sb->s_fs_info;
1061 static inline void btrfs_check_bounds(void *vptr, size_t len,
1062 void *vcontainer, size_t container_len)
1065 char *container = vcontainer;
1066 WARN_ON(ptr < container);
1067 WARN_ON(ptr + len > container + container_len);
1070 static inline void btrfs_memcpy(struct btrfs_root *root,
1072 void *dst, const void *src, size_t nr)
1074 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1075 memcpy(dst, src, nr);
1078 static inline void btrfs_memmove(struct btrfs_root *root,
1080 void *dst, void *src, size_t nr)
1082 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1083 memmove(dst, src, nr);
1086 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1088 WARN_ON(!atomic_read(&bh->b_count));
1089 mark_buffer_dirty(bh);
1092 /* helper function to cast into the data area of the leaf. */
1093 #define btrfs_item_ptr(leaf, slot, type) \
1094 ((type *)(btrfs_leaf_data(leaf) + \
1095 btrfs_item_offset((leaf)->items + (slot))))
1098 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1099 struct btrfs_block_group_cache
1100 *hint, u64 search_start,
1101 int data, int owner);
1102 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1103 struct btrfs_root *root);
1104 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1105 struct btrfs_root *root, u64 hint);
1106 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1107 struct btrfs_root *root, u64 owner,
1108 u64 num_blocks, u64 search_start,
1109 u64 search_end, struct btrfs_key *ins, int data);
1110 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1111 struct buffer_head *buf);
1112 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1113 *root, u64 blocknr, u64 num_blocks, int pin);
1114 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1116 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1117 struct btrfs_root *root,
1118 u64 blocknr, u64 num_blocks);
1119 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1120 struct btrfs_root *root);
1121 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1122 int btrfs_read_block_groups(struct btrfs_root *root);
1124 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1125 *root, struct btrfs_path *path, u32 data_size);
1126 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1127 struct btrfs_root *root,
1128 struct btrfs_path *path,
1130 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1131 *root, struct btrfs_key *key, struct btrfs_path *p, int
1133 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1134 struct btrfs_path *btrfs_alloc_path(void);
1135 void btrfs_free_path(struct btrfs_path *p);
1136 void btrfs_init_path(struct btrfs_path *p);
1137 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1138 struct btrfs_path *path);
1139 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1140 *root, struct btrfs_key *key, void *data, u32 data_size);
1141 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1142 *root, struct btrfs_path *path, struct btrfs_key
1143 *cpu_key, u32 data_size);
1144 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1145 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1146 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1147 *root, struct buffer_head *snap);
1149 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1150 struct btrfs_key *key);
1151 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1152 *root, struct btrfs_key *key, struct btrfs_root_item
1154 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1155 *root, struct btrfs_key *key, struct btrfs_root_item
1157 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1158 btrfs_root_item *item, struct btrfs_key *key);
1160 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1161 *root, const char *name, int name_len, u64 dir,
1162 struct btrfs_key *location, u8 type);
1163 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1164 struct btrfs_root *root,
1165 struct btrfs_path *path, u64 dir,
1166 const char *name, int name_len,
1168 struct btrfs_dir_item *
1169 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1170 struct btrfs_root *root,
1171 struct btrfs_path *path, u64 dir,
1172 u64 objectid, const char *name, int name_len,
1174 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1175 struct btrfs_path *path,
1176 const char *name, int name_len);
1177 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1178 struct btrfs_root *root,
1179 struct btrfs_path *path,
1180 struct btrfs_dir_item *di);
1182 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1183 struct btrfs_root *fs_root,
1184 u64 dirid, u64 *objectid);
1185 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1188 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1189 *root, u64 objectid, struct btrfs_inode_item
1191 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1192 *root, struct btrfs_path *path,
1193 struct btrfs_key *location, int mod);
1196 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1197 struct btrfs_root *root,
1198 u64 objectid, u64 pos, u64 offset,
1199 u64 disk_num_blocks,
1201 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1202 struct btrfs_root *root,
1203 struct btrfs_path *path, u64 objectid,
1204 u64 blocknr, int mod);
1205 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1206 struct btrfs_root *root,
1207 u64 objectid, u64 offset,
1208 char *data, size_t len);
1209 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1210 u64 objectid, u64 offset,
1211 char *data, size_t len);
1212 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1213 struct btrfs_root *root,
1214 struct btrfs_path *path,
1215 u64 objectid, u64 offset,
1217 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1218 struct btrfs_root *root, struct btrfs_path *path,