5 #include "kerncompat.h"
7 struct btrfs_trans_handle;
9 #define BTRFS_MAGIC "_BtRfS_M"
11 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
12 #define BTRFS_DEV_TREE_OBJECTID 2ULL
13 #define BTRFS_EXTENT_TREE_OBJECTID 3ULL
14 #define BTRFS_FS_TREE_OBJECTID 4ULL
15 #define BTRFS_ROOT_TREE_DIR_OBJECTID 5ULL
16 #define BTRFS_FIRST_FREE_OBJECTID 6ULL
19 * we can actually store much bigger names, but lets not confuse the rest
22 #define BTRFS_NAME_LEN 255
24 /* 32 bytes in various csum fields */
25 #define BTRFS_CSUM_SIZE 32
28 * the key defines the order in the tree, and so it also defines (optimal)
29 * block layout. objectid corresonds to the inode number. The flags
30 * tells us things about the object, and is a kind of stream selector.
31 * so for a given inode, keys with flags of 1 might refer to the inode
32 * data, flags of 2 may point to file data in the btree and flags == 3
33 * may point to extents.
35 * offset is the starting byte offset for this key in the stream.
37 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
38 * in cpu native order. Otherwise they are identical and their sizes
39 * should be the same (ie both packed)
41 struct btrfs_disk_key {
45 } __attribute__ ((__packed__));
51 } __attribute__ ((__packed__));
54 * every tree block (leaf or node) starts with this header.
57 u8 csum[BTRFS_CSUM_SIZE];
58 u8 fsid[16]; /* FS specific uuid */
59 __le64 blocknr; /* which block this node is supposed to live in */
65 } __attribute__ ((__packed__));
67 #define BTRFS_MAX_LEVEL 8
68 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
69 sizeof(struct btrfs_header)) / \
70 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
71 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
72 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
76 * the super block basically lists the main trees of the FS
77 * it currently lacks any block count etc etc
79 struct btrfs_super_block {
80 u8 csum[BTRFS_CSUM_SIZE];
81 /* the first 3 fields must match struct btrfs_header */
82 u8 fsid[16]; /* FS specific uuid */
83 __le64 blocknr; /* this block number */
90 __le64 root_dir_objectid;
91 __le64 last_device_id;
92 /* fields below here vary with the underlying disk */
93 __le64 device_block_start;
94 __le64 device_num_blocks;
97 } __attribute__ ((__packed__));
100 * A leaf is full of items. offset and size tell us where to find
101 * the item in the leaf (relative to the start of the data area)
104 struct btrfs_disk_key key;
107 } __attribute__ ((__packed__));
110 * leaves have an item area and a data area:
111 * [item0, item1....itemN] [free space] [dataN...data1, data0]
113 * The data is separate from the items to get the keys closer together
117 struct btrfs_header header;
118 struct btrfs_item items[];
119 } __attribute__ ((__packed__));
122 * all non-leaf blocks are nodes, they hold only keys and pointers to
125 struct btrfs_key_ptr {
126 struct btrfs_disk_key key;
128 } __attribute__ ((__packed__));
131 struct btrfs_header header;
132 struct btrfs_key_ptr ptrs[];
133 } __attribute__ ((__packed__));
136 * btrfs_paths remember the path taken from the root down to the leaf.
137 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
138 * to any other levels that are present.
140 * The slots array records the index of the item or block pointer
141 * used while walking the tree.
144 struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL];
145 int slots[BTRFS_MAX_LEVEL];
148 /* values for the type field in btrfs_extent_item */
149 #define BTRFS_EXTENT_TREE 1
150 #define BTRFS_EXTENT_FILE 2
152 * items in the extent btree are used to record the objectid of the
153 * owner of the block and the number of references
155 struct btrfs_extent_item {
159 } __attribute__ ((__packed__));
161 struct btrfs_inode_timespec {
164 } __attribute__ ((__packed__));
167 * there is no padding here on purpose. If you want to extent the inode,
168 * make a new item type
170 struct btrfs_inode_item {
181 struct btrfs_inode_timespec atime;
182 struct btrfs_inode_timespec ctime;
183 struct btrfs_inode_timespec mtime;
184 struct btrfs_inode_timespec otime;
185 } __attribute__ ((__packed__));
187 /* inline data is just a blob of bytes */
188 struct btrfs_inline_data_item {
190 } __attribute__ ((__packed__));
192 struct btrfs_dir_item {
193 struct btrfs_disk_key location;
197 } __attribute__ ((__packed__));
199 struct btrfs_root_item {
200 struct btrfs_inode_item inode;
207 } __attribute__ ((__packed__));
209 #define BTRFS_FILE_EXTENT_REG 0
210 #define BTRFS_FILE_EXTENT_INLINE 1
212 struct btrfs_file_extent_item {
216 * disk space consumed by the extent, checksum blocks are included
220 __le64 disk_num_blocks;
222 * the logical offset in file blocks (no csums)
223 * this extent record is for. This allows a file extent to point
224 * into the middle of an existing extent on disk, sharing it
225 * between two snapshots (useful if some bytes in the middle of the
226 * extent have changed
230 * the logical number of file blocks (no csums included)
233 } __attribute__ ((__packed__));
235 struct btrfs_csum_item {
236 u8 csum[BTRFS_CSUM_SIZE];
237 } __attribute__ ((__packed__));
239 struct btrfs_device_item {
242 } __attribute__ ((__packed__));
244 struct btrfs_fs_info {
245 struct btrfs_root *fs_root;
246 struct btrfs_root *extent_root;
247 struct btrfs_root *tree_root;
248 struct btrfs_root *dev_root;
249 struct btrfs_key current_insert;
250 struct btrfs_key last_insert;
251 struct radix_tree_root cache_radix;
252 struct radix_tree_root pinned_radix;
253 struct radix_tree_root dev_radix;
254 struct list_head trans;
255 struct list_head cache;
256 u64 last_inode_alloc;
257 u64 last_inode_alloc_dirid;
261 struct btrfs_trans_handle *running_transaction;
262 struct btrfs_super_block *disk_super;
266 * in ram representation of the tree. extent_root is used for all allocations
267 * and for the extent tree extent_root root. current_insert is used
268 * only for the extent tree.
271 struct btrfs_buffer *node;
272 struct btrfs_buffer *commit_root;
273 struct btrfs_root_item root_item;
274 struct btrfs_key root_key;
275 struct btrfs_fs_info *fs_info;
281 /* the lower bits in the key flags defines the item type */
282 #define BTRFS_KEY_TYPE_MAX 256
283 #define BTRFS_KEY_TYPE_SHIFT 24
284 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
285 BTRFS_KEY_TYPE_SHIFT)
288 * inode items have the data typically returned from stat and store other
289 * info about object characteristics. There is one for every file and dir in
292 #define BTRFS_INODE_ITEM_KEY 1
295 * dir items are the name -> inode pointers in a directory. There is one
296 * for every name in a directory.
298 #define BTRFS_DIR_ITEM_KEY 2
299 #define BTRFS_DIR_INDEX_KEY 3
301 * inline data is file data that fits in the btree.
303 #define BTRFS_INLINE_DATA_KEY 4
305 * extent data is for data that can't fit in the btree. It points to
306 * a (hopefully) huge chunk of disk
308 #define BTRFS_EXTENT_DATA_KEY 5
310 * csum items have the checksums for data in the extents
312 #define BTRFS_CSUM_ITEM_KEY 6
315 * root items point to tree roots. There are typically in the root
316 * tree used by the super block to find all the other trees
318 #define BTRFS_ROOT_ITEM_KEY 7
320 * extent items are in the extent map tree. These record which blocks
321 * are used, and how many references there are to each block
323 #define BTRFS_EXTENT_ITEM_KEY 8
326 * dev items list the devices that make up the FS
328 #define BTRFS_DEV_ITEM_KEY 9
331 * string items are for debugging. They just store a short string of
334 #define BTRFS_STRING_ITEM_KEY 10
336 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
338 return le64_to_cpu(i->generation);
341 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
344 i->generation = cpu_to_le64(val);
347 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
349 return le64_to_cpu(i->size);
352 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
354 i->size = cpu_to_le64(val);
357 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
359 return le64_to_cpu(i->nblocks);
362 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
364 i->nblocks = cpu_to_le64(val);
367 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
369 return le32_to_cpu(i->nlink);
372 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
374 i->nlink = cpu_to_le32(val);
377 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
379 return le32_to_cpu(i->uid);
382 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
384 i->uid = cpu_to_le32(val);
387 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
389 return le32_to_cpu(i->gid);
392 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
394 i->gid = cpu_to_le32(val);
397 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
399 return le32_to_cpu(i->mode);
402 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
404 i->mode = cpu_to_le32(val);
407 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
409 return le32_to_cpu(i->rdev);
412 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
414 i->rdev = cpu_to_le32(val);
417 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
419 return le16_to_cpu(i->flags);
422 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
424 i->flags = cpu_to_le16(val);
427 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
429 return le16_to_cpu(i->compat_flags);
432 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
435 i->compat_flags = cpu_to_le16(val);
438 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
440 return le64_to_cpu(ts->sec);
443 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
446 ts->sec = cpu_to_le64(val);
449 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
451 return le32_to_cpu(ts->nsec);
454 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
457 ts->nsec = cpu_to_le32(val);
460 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
462 return le32_to_cpu(ei->refs);
465 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
467 ei->refs = cpu_to_le32(val);
470 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
472 return le64_to_cpu(ei->owner);
475 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
477 ei->owner = cpu_to_le64(val);
480 static inline u8 btrfs_extent_type(struct btrfs_extent_item *ei)
485 static inline void btrfs_set_extent_type(struct btrfs_extent_item *ei, u8 val)
490 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
492 return le64_to_cpu(n->ptrs[nr].blockptr);
496 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
499 n->ptrs[nr].blockptr = cpu_to_le64(val);
502 static inline u32 btrfs_item_offset(struct btrfs_item *item)
504 return le32_to_cpu(item->offset);
507 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
509 item->offset = cpu_to_le32(val);
512 static inline u32 btrfs_item_end(struct btrfs_item *item)
514 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
517 static inline u16 btrfs_item_size(struct btrfs_item *item)
519 return le16_to_cpu(item->size);
522 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
524 item->size = cpu_to_le16(val);
527 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
529 return le16_to_cpu(d->flags);
532 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
534 d->flags = cpu_to_le16(val);
537 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
542 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
547 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
549 return le16_to_cpu(d->name_len);
552 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
554 d->name_len = cpu_to_le16(val);
557 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
558 struct btrfs_disk_key *disk)
560 cpu->offset = le64_to_cpu(disk->offset);
561 cpu->flags = le32_to_cpu(disk->flags);
562 cpu->objectid = le64_to_cpu(disk->objectid);
565 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
566 struct btrfs_key *cpu)
568 disk->offset = cpu_to_le64(cpu->offset);
569 disk->flags = cpu_to_le32(cpu->flags);
570 disk->objectid = cpu_to_le64(cpu->objectid);
573 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
575 return le64_to_cpu(disk->objectid);
578 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
581 disk->objectid = cpu_to_le64(val);
584 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
586 return le64_to_cpu(disk->offset);
589 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
592 disk->offset = cpu_to_le64(val);
595 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
597 return le32_to_cpu(disk->flags);
600 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
603 disk->flags = cpu_to_le32(val);
606 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
608 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
611 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
614 u32 flags = btrfs_disk_key_flags(key);
615 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
616 val = val << BTRFS_KEY_TYPE_SHIFT;
617 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
618 btrfs_set_disk_key_flags(key, flags);
621 static inline u32 btrfs_key_type(struct btrfs_key *key)
623 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
626 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
628 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
629 val = val << BTRFS_KEY_TYPE_SHIFT;
630 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
633 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
635 return le64_to_cpu(h->blocknr);
638 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
640 h->blocknr = cpu_to_le64(blocknr);
643 static inline u64 btrfs_header_generation(struct btrfs_header *h)
645 return le64_to_cpu(h->generation);
648 static inline void btrfs_set_header_generation(struct btrfs_header *h,
651 h->generation = cpu_to_le64(val);
654 static inline u64 btrfs_header_owner(struct btrfs_header *h)
656 return le64_to_cpu(h->owner);
659 static inline void btrfs_set_header_owner(struct btrfs_header *h,
662 h->owner = cpu_to_le64(val);
665 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
667 return le16_to_cpu(h->nritems);
670 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
672 h->nritems = cpu_to_le16(val);
675 static inline u16 btrfs_header_flags(struct btrfs_header *h)
677 return le16_to_cpu(h->flags);
680 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
682 h->flags = cpu_to_le16(val);
685 static inline int btrfs_header_level(struct btrfs_header *h)
690 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
692 BUG_ON(level > BTRFS_MAX_LEVEL);
696 static inline int btrfs_is_leaf(struct btrfs_node *n)
698 return (btrfs_header_level(&n->header) == 0);
701 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
703 return le64_to_cpu(item->blocknr);
706 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
708 item->blocknr = cpu_to_le64(val);
711 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
713 return le64_to_cpu(item->root_dirid);
716 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
718 item->root_dirid = cpu_to_le64(val);
721 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
723 return le32_to_cpu(item->refs);
726 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
728 item->refs = cpu_to_le32(val);
731 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
733 return le64_to_cpu(s->blocknr);
736 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
738 s->blocknr = cpu_to_le64(val);
741 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
743 return le64_to_cpu(s->generation);
746 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
749 s->generation = cpu_to_le64(val);
752 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
754 return le64_to_cpu(s->root);
757 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
759 s->root = cpu_to_le64(val);
762 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
764 return le64_to_cpu(s->total_blocks);
767 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
770 s->total_blocks = cpu_to_le64(val);
773 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
775 return le64_to_cpu(s->blocks_used);
778 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
781 s->blocks_used = cpu_to_le64(val);
784 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
786 return le32_to_cpu(s->blocksize);
789 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
792 s->blocksize = cpu_to_le32(val);
795 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
797 return le64_to_cpu(s->root_dir_objectid);
800 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
803 s->root_dir_objectid = cpu_to_le64(val);
806 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
808 return le64_to_cpu(s->last_device_id);
811 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
814 s->last_device_id = cpu_to_le64(val);
817 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
819 return le64_to_cpu(s->device_id);
822 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
825 s->device_id = cpu_to_le64(val);
828 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
830 return le64_to_cpu(s->device_block_start);
833 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
836 s->device_block_start = cpu_to_le64(val);
839 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
841 return le64_to_cpu(s->device_num_blocks);
844 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
847 s->device_num_blocks = cpu_to_le64(val);
850 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
852 return le64_to_cpu(s->device_root);
855 static inline void btrfs_set_super_device_root(struct btrfs_super_block
858 s->device_root = cpu_to_le64(val);
861 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
863 return (u8 *)l->items;
866 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
870 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
876 static inline char *btrfs_file_extent_inline_start(struct
877 btrfs_file_extent_item *e)
879 return (char *)(&e->disk_blocknr);
882 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
884 return (unsigned long)(&((struct
885 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
888 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
890 struct btrfs_file_extent_item *fe = NULL;
891 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
894 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
897 return le64_to_cpu(e->disk_blocknr);
900 static inline void btrfs_set_file_extent_disk_blocknr(struct
901 btrfs_file_extent_item
904 e->disk_blocknr = cpu_to_le64(val);
907 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
909 return le64_to_cpu(e->generation);
912 static inline void btrfs_set_file_extent_generation(struct
913 btrfs_file_extent_item *e,
916 e->generation = cpu_to_le64(val);
919 static inline u64 btrfs_file_extent_disk_num_blocks(struct
920 btrfs_file_extent_item *e)
922 return le64_to_cpu(e->disk_num_blocks);
925 static inline void btrfs_set_file_extent_disk_num_blocks(struct
926 btrfs_file_extent_item
929 e->disk_num_blocks = cpu_to_le64(val);
932 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
934 return le64_to_cpu(e->offset);
937 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
940 e->offset = cpu_to_le64(val);
943 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
946 return le64_to_cpu(e->num_blocks);
949 static inline void btrfs_set_file_extent_num_blocks(struct
950 btrfs_file_extent_item *e,
953 e->num_blocks = cpu_to_le64(val);
956 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
958 return le16_to_cpu(d->pathlen);
961 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
964 d->pathlen = cpu_to_le16(val);
967 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
969 return le64_to_cpu(d->device_id);
972 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
975 d->device_id = cpu_to_le64(val);
978 /* helper function to cast into the data area of the leaf. */
979 #define btrfs_item_ptr(leaf, slot, type) \
980 ((type *)(btrfs_leaf_data(leaf) + \
981 btrfs_item_offset((leaf)->items + (slot))))
983 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
984 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
985 *root, struct btrfs_path *path, u32 data_size);
986 struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
987 struct btrfs_root *root);
988 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
989 struct btrfs_buffer *buf);
990 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
991 *root, u64 blocknr, u64 num_blocks, int pin);
992 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
993 *root, struct btrfs_key *key, struct btrfs_path *p, int
995 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
996 void btrfs_init_path(struct btrfs_path *p);
997 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
998 struct btrfs_path *path);
999 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1000 *root, struct btrfs_key *key, void *data, u32 data_size);
1001 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1002 *root, struct btrfs_path *path, struct btrfs_key
1003 *cpu_key, u32 data_size);
1004 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1005 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1006 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1007 *root, struct btrfs_buffer *snap);
1008 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1010 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1011 struct btrfs_key *key);
1012 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1013 *root, struct btrfs_key *key, struct btrfs_root_item
1015 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1016 *root, struct btrfs_key *key, struct btrfs_root_item
1018 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1019 btrfs_root_item *item, struct btrfs_key *key);
1020 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1021 *root, char *name, int name_len, u64 dir,
1022 struct btrfs_key *location, u8 type);
1023 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1024 *root, struct btrfs_path *path, u64 dir, char *name,
1025 int name_len, int mod);
1026 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
1027 char *name, int name_len);
1028 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1029 struct btrfs_root *fs_root,
1030 u64 dirid, u64 *objectid);
1031 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1032 *root, u64 objectid, struct btrfs_inode_item
1034 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1035 *root, struct btrfs_path *path, u64 objectid, int mod);