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
35 * the key defines the order in the tree, and so it also defines (optimal)
36 * block layout. objectid corresonds to the inode number. The flags
37 * tells us things about the object, and is a kind of stream selector.
38 * so for a given inode, keys with flags of 1 might refer to the inode
39 * data, flags of 2 may point to file data in the btree and flags == 3
40 * may point to extents.
42 * offset is the starting byte offset for this key in the stream.
44 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
45 * in cpu native order. Otherwise they are identical and their sizes
46 * should be the same (ie both packed)
48 struct btrfs_disk_key {
52 } __attribute__ ((__packed__));
58 } __attribute__ ((__packed__));
61 * every tree block (leaf or node) starts with this header.
64 u8 csum[BTRFS_CSUM_SIZE];
65 u8 fsid[16]; /* FS specific uuid */
66 __le64 blocknr; /* which block this node is supposed to live in */
72 } __attribute__ ((__packed__));
74 #define BTRFS_MAX_LEVEL 8
75 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
76 sizeof(struct btrfs_header)) / \
77 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
78 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
79 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
80 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
81 sizeof(struct btrfs_item) - \
82 sizeof(struct btrfs_file_extent_item))
86 * the super block basically lists the main trees of the FS
87 * it currently lacks any block count etc etc
89 struct btrfs_super_block {
90 u8 csum[BTRFS_CSUM_SIZE];
91 /* the first 3 fields must match struct btrfs_header */
92 u8 fsid[16]; /* FS specific uuid */
93 __le64 blocknr; /* this block number */
100 __le64 root_dir_objectid;
101 __le64 last_device_id;
102 /* fields below here vary with the underlying disk */
103 __le64 device_block_start;
104 __le64 device_num_blocks;
107 } __attribute__ ((__packed__));
110 * A leaf is full of items. offset and size tell us where to find
111 * the item in the leaf (relative to the start of the data area)
114 struct btrfs_disk_key key;
117 } __attribute__ ((__packed__));
120 * leaves have an item area and a data area:
121 * [item0, item1....itemN] [free space] [dataN...data1, data0]
123 * The data is separate from the items to get the keys closer together
127 struct btrfs_header header;
128 struct btrfs_item items[];
129 } __attribute__ ((__packed__));
132 * all non-leaf blocks are nodes, they hold only keys and pointers to
135 struct btrfs_key_ptr {
136 struct btrfs_disk_key key;
138 } __attribute__ ((__packed__));
141 struct btrfs_header header;
142 struct btrfs_key_ptr ptrs[];
143 } __attribute__ ((__packed__));
146 * btrfs_paths remember the path taken from the root down to the leaf.
147 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
148 * to any other levels that are present.
150 * The slots array records the index of the item or block pointer
151 * used while walking the tree.
154 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
155 int slots[BTRFS_MAX_LEVEL];
159 * items in the extent btree are used to record the objectid of the
160 * owner of the block and the number of references
162 struct btrfs_extent_item {
165 } __attribute__ ((__packed__));
167 struct btrfs_inode_timespec {
170 } __attribute__ ((__packed__));
173 * there is no padding here on purpose. If you want to extent the inode,
174 * make a new item type
176 struct btrfs_inode_item {
188 struct btrfs_inode_timespec atime;
189 struct btrfs_inode_timespec ctime;
190 struct btrfs_inode_timespec mtime;
191 struct btrfs_inode_timespec otime;
192 } __attribute__ ((__packed__));
194 struct btrfs_dir_item {
195 struct btrfs_disk_key location;
199 } __attribute__ ((__packed__));
201 struct btrfs_root_item {
202 struct btrfs_inode_item inode;
209 } __attribute__ ((__packed__));
211 #define BTRFS_FILE_EXTENT_REG 0
212 #define BTRFS_FILE_EXTENT_INLINE 1
214 struct btrfs_file_extent_item {
218 * disk space consumed by the extent, checksum blocks are included
222 __le64 disk_num_blocks;
224 * the logical offset in file blocks (no csums)
225 * this extent record is for. This allows a file extent to point
226 * into the middle of an existing extent on disk, sharing it
227 * between two snapshots (useful if some bytes in the middle of the
228 * extent have changed
232 * the logical number of file blocks (no csums included)
235 } __attribute__ ((__packed__));
237 struct btrfs_csum_item {
238 u8 csum[BTRFS_CSUM_SIZE];
239 } __attribute__ ((__packed__));
241 struct btrfs_device_item {
244 } __attribute__ ((__packed__));
246 /* tag for the radix tree of block groups in ram */
247 #define BTRFS_BLOCK_GROUP_DIRTY 0
248 #define BTRFS_BLOCK_GROUP_AVAIL 1
249 #define BTRFS_BLOCK_GROUP_HINTS 8
250 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
251 struct btrfs_block_group_item {
253 } __attribute__ ((__packed__));
255 struct btrfs_block_group_cache {
256 struct btrfs_key key;
257 struct btrfs_block_group_item item;
258 struct radix_tree_root *radix;
266 struct btrfs_fs_info {
267 struct btrfs_root *extent_root;
268 struct btrfs_root *tree_root;
269 struct btrfs_root *dev_root;
270 struct radix_tree_root fs_roots_radix;
271 struct radix_tree_root pending_del_radix;
272 struct radix_tree_root pinned_radix;
273 struct radix_tree_root dev_radix;
274 struct radix_tree_root block_group_radix;
275 struct radix_tree_root block_group_data_radix;
277 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
278 int extent_tree_insert_nr;
279 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
280 int extent_tree_prealloc_nr;
283 struct btrfs_transaction *running_transaction;
284 struct btrfs_super_block *disk_super;
285 struct buffer_head *sb_buffer;
286 struct super_block *sb;
287 struct inode *btree_inode;
288 struct mutex trans_mutex;
289 struct mutex fs_mutex;
290 struct list_head trans_list;
291 struct crypto_hash *hash_tfm;
292 spinlock_t hash_lock;
298 * in ram representation of the tree. extent_root is used for all allocations
299 * and for the extent tree extent_root root.
302 struct buffer_head *node;
303 struct buffer_head *commit_root;
304 struct btrfs_root_item root_item;
305 struct btrfs_key root_key;
306 struct btrfs_fs_info *fs_info;
314 u64 last_inode_alloc;
317 /* the lower bits in the key flags defines the item type */
318 #define BTRFS_KEY_TYPE_MAX 256
319 #define BTRFS_KEY_TYPE_SHIFT 24
320 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
321 BTRFS_KEY_TYPE_SHIFT)
324 * inode items have the data typically returned from stat and store other
325 * info about object characteristics. There is one for every file and dir in
328 #define BTRFS_INODE_ITEM_KEY 1
330 /* reserve 2-15 close to the inode for later flexibility */
333 * dir items are the name -> inode pointers in a directory. There is one
334 * for every name in a directory.
336 #define BTRFS_DIR_ITEM_KEY 16
337 #define BTRFS_DIR_INDEX_KEY 17
339 * extent data is for file data
341 #define BTRFS_EXTENT_DATA_KEY 18
343 * csum items have the checksums for data in the extents
345 #define BTRFS_CSUM_ITEM_KEY 19
347 /* reserve 20-31 for other file stuff */
350 * root items point to tree roots. There are typically in the root
351 * tree used by the super block to find all the other trees
353 #define BTRFS_ROOT_ITEM_KEY 32
355 * extent items are in the extent map tree. These record which blocks
356 * are used, and how many references there are to each block
358 #define BTRFS_EXTENT_ITEM_KEY 33
361 * block groups give us hints into the extent allocation trees. Which
362 * blocks are free etc etc
364 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
367 * dev items list the devices that make up the FS
369 #define BTRFS_DEV_ITEM_KEY 35
372 * string items are for debugging. They just store a short string of
375 #define BTRFS_STRING_ITEM_KEY 253
378 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
380 return le64_to_cpu(bi->used);
383 static inline void btrfs_set_block_group_used(struct
384 btrfs_block_group_item *bi,
387 bi->used = cpu_to_le64(val);
390 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
392 return le64_to_cpu(i->generation);
395 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
398 i->generation = cpu_to_le64(val);
401 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
403 return le64_to_cpu(i->size);
406 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
408 i->size = cpu_to_le64(val);
411 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
413 return le64_to_cpu(i->nblocks);
416 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
418 i->nblocks = cpu_to_le64(val);
421 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
423 return le64_to_cpu(i->block_group);
426 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
429 i->block_group = cpu_to_le64(val);
432 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
434 return le32_to_cpu(i->nlink);
437 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
439 i->nlink = cpu_to_le32(val);
442 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
444 return le32_to_cpu(i->uid);
447 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
449 i->uid = cpu_to_le32(val);
452 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
454 return le32_to_cpu(i->gid);
457 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
459 i->gid = cpu_to_le32(val);
462 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
464 return le32_to_cpu(i->mode);
467 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
469 i->mode = cpu_to_le32(val);
472 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
474 return le32_to_cpu(i->rdev);
477 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
479 i->rdev = cpu_to_le32(val);
482 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
484 return le16_to_cpu(i->flags);
487 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
489 i->flags = cpu_to_le16(val);
492 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
494 return le16_to_cpu(i->compat_flags);
497 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
500 i->compat_flags = cpu_to_le16(val);
503 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
505 return le64_to_cpu(ts->sec);
508 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
511 ts->sec = cpu_to_le64(val);
514 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
516 return le32_to_cpu(ts->nsec);
519 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
522 ts->nsec = cpu_to_le32(val);
525 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
527 return le32_to_cpu(ei->refs);
530 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
532 ei->refs = cpu_to_le32(val);
535 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
537 return le64_to_cpu(ei->owner);
540 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
542 ei->owner = cpu_to_le64(val);
545 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
547 return le64_to_cpu(n->ptrs[nr].blockptr);
551 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
554 n->ptrs[nr].blockptr = cpu_to_le64(val);
557 static inline u32 btrfs_item_offset(struct btrfs_item *item)
559 return le32_to_cpu(item->offset);
562 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
564 item->offset = cpu_to_le32(val);
567 static inline u32 btrfs_item_end(struct btrfs_item *item)
569 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
572 static inline u16 btrfs_item_size(struct btrfs_item *item)
574 return le16_to_cpu(item->size);
577 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
579 item->size = cpu_to_le16(val);
582 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
584 return le16_to_cpu(d->flags);
587 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
589 d->flags = cpu_to_le16(val);
592 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
597 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
602 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
604 return le16_to_cpu(d->name_len);
607 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
609 d->name_len = cpu_to_le16(val);
612 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
613 struct btrfs_disk_key *disk)
615 cpu->offset = le64_to_cpu(disk->offset);
616 cpu->flags = le32_to_cpu(disk->flags);
617 cpu->objectid = le64_to_cpu(disk->objectid);
620 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
621 struct btrfs_key *cpu)
623 disk->offset = cpu_to_le64(cpu->offset);
624 disk->flags = cpu_to_le32(cpu->flags);
625 disk->objectid = cpu_to_le64(cpu->objectid);
628 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
630 return le64_to_cpu(disk->objectid);
633 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
636 disk->objectid = cpu_to_le64(val);
639 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
641 return le64_to_cpu(disk->offset);
644 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
647 disk->offset = cpu_to_le64(val);
650 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
652 return le32_to_cpu(disk->flags);
655 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
658 disk->flags = cpu_to_le32(val);
661 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
663 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
666 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
669 u32 flags = btrfs_disk_key_flags(key);
670 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
671 val = val << BTRFS_KEY_TYPE_SHIFT;
672 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
673 btrfs_set_disk_key_flags(key, flags);
676 static inline u32 btrfs_key_type(struct btrfs_key *key)
678 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
681 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
683 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
684 val = val << BTRFS_KEY_TYPE_SHIFT;
685 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
688 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
690 return le64_to_cpu(h->blocknr);
693 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
695 h->blocknr = cpu_to_le64(blocknr);
698 static inline u64 btrfs_header_generation(struct btrfs_header *h)
700 return le64_to_cpu(h->generation);
703 static inline void btrfs_set_header_generation(struct btrfs_header *h,
706 h->generation = cpu_to_le64(val);
709 static inline u64 btrfs_header_owner(struct btrfs_header *h)
711 return le64_to_cpu(h->owner);
714 static inline void btrfs_set_header_owner(struct btrfs_header *h,
717 h->owner = cpu_to_le64(val);
720 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
722 return le16_to_cpu(h->nritems);
725 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
727 h->nritems = cpu_to_le16(val);
730 static inline u16 btrfs_header_flags(struct btrfs_header *h)
732 return le16_to_cpu(h->flags);
735 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
737 h->flags = cpu_to_le16(val);
740 static inline int btrfs_header_level(struct btrfs_header *h)
745 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
747 BUG_ON(level > BTRFS_MAX_LEVEL);
751 static inline int btrfs_is_leaf(struct btrfs_node *n)
753 return (btrfs_header_level(&n->header) == 0);
756 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
758 return le64_to_cpu(item->blocknr);
761 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
763 item->blocknr = cpu_to_le64(val);
766 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
768 return le64_to_cpu(item->root_dirid);
771 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
773 item->root_dirid = cpu_to_le64(val);
776 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
778 return le32_to_cpu(item->refs);
781 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
783 item->refs = cpu_to_le32(val);
786 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
788 return le64_to_cpu(s->blocknr);
791 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
793 s->blocknr = cpu_to_le64(val);
796 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
798 return le64_to_cpu(s->generation);
801 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
804 s->generation = cpu_to_le64(val);
807 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
809 return le64_to_cpu(s->root);
812 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
814 s->root = cpu_to_le64(val);
817 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
819 return le64_to_cpu(s->total_blocks);
822 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
825 s->total_blocks = cpu_to_le64(val);
828 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
830 return le64_to_cpu(s->blocks_used);
833 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
836 s->blocks_used = cpu_to_le64(val);
839 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
841 return le32_to_cpu(s->blocksize);
844 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
847 s->blocksize = cpu_to_le32(val);
850 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
852 return le64_to_cpu(s->root_dir_objectid);
855 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
858 s->root_dir_objectid = cpu_to_le64(val);
861 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
863 return le64_to_cpu(s->last_device_id);
866 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
869 s->last_device_id = cpu_to_le64(val);
872 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
874 return le64_to_cpu(s->device_id);
877 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
880 s->device_id = cpu_to_le64(val);
883 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
885 return le64_to_cpu(s->device_block_start);
888 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
891 s->device_block_start = cpu_to_le64(val);
894 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
896 return le64_to_cpu(s->device_num_blocks);
899 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
902 s->device_num_blocks = cpu_to_le64(val);
905 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
907 return le64_to_cpu(s->device_root);
910 static inline void btrfs_set_super_device_root(struct btrfs_super_block
913 s->device_root = cpu_to_le64(val);
917 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
919 return (u8 *)l->items;
922 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
926 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
932 static inline char *btrfs_file_extent_inline_start(struct
933 btrfs_file_extent_item *e)
935 return (char *)(&e->disk_blocknr);
938 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
940 return (unsigned long)(&((struct
941 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
944 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
946 struct btrfs_file_extent_item *fe = NULL;
947 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
950 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
953 return le64_to_cpu(e->disk_blocknr);
956 static inline void btrfs_set_file_extent_disk_blocknr(struct
957 btrfs_file_extent_item
960 e->disk_blocknr = cpu_to_le64(val);
963 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
965 return le64_to_cpu(e->generation);
968 static inline void btrfs_set_file_extent_generation(struct
969 btrfs_file_extent_item *e,
972 e->generation = cpu_to_le64(val);
975 static inline u64 btrfs_file_extent_disk_num_blocks(struct
976 btrfs_file_extent_item *e)
978 return le64_to_cpu(e->disk_num_blocks);
981 static inline void btrfs_set_file_extent_disk_num_blocks(struct
982 btrfs_file_extent_item
985 e->disk_num_blocks = cpu_to_le64(val);
988 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
990 return le64_to_cpu(e->offset);
993 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
996 e->offset = cpu_to_le64(val);
999 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
1002 return le64_to_cpu(e->num_blocks);
1005 static inline void btrfs_set_file_extent_num_blocks(struct
1006 btrfs_file_extent_item *e,
1009 e->num_blocks = cpu_to_le64(val);
1012 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
1014 return le16_to_cpu(d->pathlen);
1017 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
1020 d->pathlen = cpu_to_le16(val);
1023 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
1025 return le64_to_cpu(d->device_id);
1028 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
1031 d->device_id = cpu_to_le64(val);
1034 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1036 return sb->s_fs_info;
1039 static inline void btrfs_check_bounds(void *vptr, size_t len,
1040 void *vcontainer, size_t container_len)
1043 char *container = vcontainer;
1044 WARN_ON(ptr < container);
1045 WARN_ON(ptr + len > container + container_len);
1048 static inline void btrfs_memcpy(struct btrfs_root *root,
1050 void *dst, const void *src, size_t nr)
1052 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1053 memcpy(dst, src, nr);
1056 static inline void btrfs_memmove(struct btrfs_root *root,
1058 void *dst, void *src, size_t nr)
1060 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1061 memmove(dst, src, nr);
1064 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1066 WARN_ON(!atomic_read(&bh->b_count));
1067 mark_buffer_dirty(bh);
1070 /* helper function to cast into the data area of the leaf. */
1071 #define btrfs_item_ptr(leaf, slot, type) \
1072 ((type *)(btrfs_leaf_data(leaf) + \
1073 btrfs_item_offset((leaf)->items + (slot))))
1076 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1077 struct btrfs_block_group_cache
1078 *hint, u64 search_start,
1080 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1081 struct btrfs_root *root);
1082 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1083 struct btrfs_root *root, u64 hint);
1084 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1085 struct btrfs_root *root, u64 owner,
1086 u64 num_blocks, u64 search_start,
1087 u64 search_end, struct btrfs_key *ins, int data);
1088 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1089 struct buffer_head *buf);
1090 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1091 *root, u64 blocknr, u64 num_blocks, int pin);
1092 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1094 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1095 struct btrfs_root *root,
1096 u64 blocknr, u64 num_blocks);
1097 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1098 struct btrfs_root *root);
1099 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1100 int btrfs_read_block_groups(struct btrfs_root *root);
1102 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1103 *root, struct btrfs_path *path, u32 data_size);
1104 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1105 struct btrfs_root *root,
1106 struct btrfs_path *path,
1108 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1109 *root, struct btrfs_key *key, struct btrfs_path *p, int
1111 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1112 struct btrfs_path *btrfs_alloc_path(void);
1113 void btrfs_free_path(struct btrfs_path *p);
1114 void btrfs_init_path(struct btrfs_path *p);
1115 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1116 struct btrfs_path *path);
1117 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1118 *root, struct btrfs_key *key, void *data, u32 data_size);
1119 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1120 *root, struct btrfs_path *path, struct btrfs_key
1121 *cpu_key, u32 data_size);
1122 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1123 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1124 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1125 *root, struct buffer_head *snap);
1127 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1128 struct btrfs_key *key);
1129 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1130 *root, struct btrfs_key *key, struct btrfs_root_item
1132 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1133 *root, struct btrfs_key *key, struct btrfs_root_item
1135 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1136 btrfs_root_item *item, struct btrfs_key *key);
1138 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1139 *root, const char *name, int name_len, u64 dir,
1140 struct btrfs_key *location, u8 type);
1141 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1142 struct btrfs_root *root,
1143 struct btrfs_path *path, u64 dir,
1144 const char *name, int name_len,
1146 struct btrfs_dir_item *
1147 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1148 struct btrfs_root *root,
1149 struct btrfs_path *path, u64 dir,
1150 u64 objectid, const char *name, int name_len,
1152 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1153 struct btrfs_path *path,
1154 const char *name, int name_len);
1155 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1156 struct btrfs_root *root,
1157 struct btrfs_path *path,
1158 struct btrfs_dir_item *di);
1160 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1161 struct btrfs_root *fs_root,
1162 u64 dirid, u64 *objectid);
1163 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1166 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1167 *root, u64 objectid, struct btrfs_inode_item
1169 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1170 *root, struct btrfs_path *path,
1171 struct btrfs_key *location, int mod);
1174 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1175 struct btrfs_root *root,
1176 u64 objectid, u64 pos, u64 offset,
1178 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1179 struct btrfs_root *root,
1180 struct btrfs_path *path, u64 objectid,
1181 u64 blocknr, int mod);
1182 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1183 struct btrfs_root *root,
1184 u64 objectid, u64 offset,
1185 char *data, size_t len);
1186 int btrfs_csum_verify_file_block(struct btrfs_root *root,
1187 u64 objectid, u64 offset,
1188 char *data, size_t len);
1189 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1190 struct btrfs_root *root,
1191 struct btrfs_path *path,
1192 u64 objectid, u64 offset,
1195 extern struct subsystem btrfs_subsys;