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];
149 * items in the extent btree are used to record the objectid of the
150 * owner of the block and the number of references
152 struct btrfs_extent_item {
155 } __attribute__ ((__packed__));
157 struct btrfs_inode_timespec {
160 } __attribute__ ((__packed__));
163 * there is no padding here on purpose. If you want to extent the inode,
164 * make a new item type
166 struct btrfs_inode_item {
177 struct btrfs_inode_timespec atime;
178 struct btrfs_inode_timespec ctime;
179 struct btrfs_inode_timespec mtime;
180 struct btrfs_inode_timespec otime;
181 } __attribute__ ((__packed__));
183 /* inline data is just a blob of bytes */
184 struct btrfs_inline_data_item {
186 } __attribute__ ((__packed__));
188 struct btrfs_dir_item {
189 struct btrfs_disk_key location;
193 } __attribute__ ((__packed__));
195 struct btrfs_root_item {
196 struct btrfs_inode_item inode;
203 } __attribute__ ((__packed__));
205 #define BTRFS_FILE_EXTENT_REG 0
206 #define BTRFS_FILE_EXTENT_INLINE 1
208 struct btrfs_file_extent_item {
212 * disk space consumed by the extent, checksum blocks are included
216 __le64 disk_num_blocks;
218 * the logical offset in file blocks (no csums)
219 * this extent record is for. This allows a file extent to point
220 * into the middle of an existing extent on disk, sharing it
221 * between two snapshots (useful if some bytes in the middle of the
222 * extent have changed
226 * the logical number of file blocks (no csums included)
229 } __attribute__ ((__packed__));
231 struct btrfs_csum_item {
232 u8 csum[BTRFS_CSUM_SIZE];
233 } __attribute__ ((__packed__));
235 struct btrfs_device_item {
238 } __attribute__ ((__packed__));
240 /* tag for the radix tree of block groups in ram */
241 #define BTRFS_BLOCK_GROUP_DIRTY 0
242 #define BTRFS_BLOCK_GROUP_HINTS 8
243 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
244 struct btrfs_block_group_item {
246 } __attribute__ ((__packed__));
248 struct btrfs_block_group_cache {
249 struct btrfs_key key;
250 struct btrfs_block_group_item item;
253 struct btrfs_fs_info {
254 struct btrfs_root *fs_root;
255 struct btrfs_root *extent_root;
256 struct btrfs_root *tree_root;
257 struct btrfs_root *dev_root;
258 struct btrfs_key current_insert;
259 struct btrfs_key last_insert;
260 struct radix_tree_root cache_radix;
261 struct radix_tree_root pinned_radix;
262 struct radix_tree_root dev_radix;
263 struct radix_tree_root block_group_radix;
264 struct list_head trans;
265 struct list_head cache;
266 u64 last_inode_alloc;
267 u64 last_inode_alloc_dirid;
271 struct btrfs_trans_handle *running_transaction;
272 struct btrfs_super_block *disk_super;
276 * in ram representation of the tree. extent_root is used for all allocations
277 * and for the extent tree extent_root root. current_insert is used
278 * only for the extent tree.
281 struct btrfs_buffer *node;
282 struct btrfs_buffer *commit_root;
283 struct btrfs_root_item root_item;
284 struct btrfs_key root_key;
285 struct btrfs_fs_info *fs_info;
291 /* the lower bits in the key flags defines the item type */
292 #define BTRFS_KEY_TYPE_MAX 256
293 #define BTRFS_KEY_TYPE_SHIFT 24
294 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
295 BTRFS_KEY_TYPE_SHIFT)
298 * inode items have the data typically returned from stat and store other
299 * info about object characteristics. There is one for every file and dir in
302 #define BTRFS_INODE_ITEM_KEY 1
304 /* reserve 2-15 close to the inode for later flexibility */
307 * dir items are the name -> inode pointers in a directory. There is one
308 * for every name in a directory.
310 #define BTRFS_DIR_ITEM_KEY 16
311 #define BTRFS_DIR_INDEX_KEY 17
313 * extent data is for file data
315 #define BTRFS_EXTENT_DATA_KEY 18
317 * csum items have the checksums for data in the extents
319 #define BTRFS_CSUM_ITEM_KEY 19
321 /* reserve 20-31 for other file stuff */
324 * root items point to tree roots. There are typically in the root
325 * tree used by the super block to find all the other trees
327 #define BTRFS_ROOT_ITEM_KEY 32
329 * extent items are in the extent map tree. These record which blocks
330 * are used, and how many references there are to each block
332 #define BTRFS_EXTENT_ITEM_KEY 33
335 * block groups give us hints into the extent allocation trees. Which
336 * blocks are free etc etc
338 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
341 * dev items list the devices that make up the FS
343 #define BTRFS_DEV_ITEM_KEY 35
346 * string items are for debugging. They just store a short string of
349 #define BTRFS_STRING_ITEM_KEY 253
352 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
354 return le64_to_cpu(bi->used);
357 static inline void btrfs_set_block_group_used(struct
358 btrfs_block_group_item *bi,
361 bi->used = cpu_to_le64(val);
364 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
366 return le64_to_cpu(i->generation);
369 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
372 i->generation = cpu_to_le64(val);
375 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
377 return le64_to_cpu(i->size);
380 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
382 i->size = cpu_to_le64(val);
385 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
387 return le64_to_cpu(i->nblocks);
390 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
392 i->nblocks = cpu_to_le64(val);
395 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
397 return le32_to_cpu(i->nlink);
400 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
402 i->nlink = cpu_to_le32(val);
405 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
407 return le32_to_cpu(i->uid);
410 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
412 i->uid = cpu_to_le32(val);
415 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
417 return le32_to_cpu(i->gid);
420 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
422 i->gid = cpu_to_le32(val);
425 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
427 return le32_to_cpu(i->mode);
430 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
432 i->mode = cpu_to_le32(val);
435 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
437 return le32_to_cpu(i->rdev);
440 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
442 i->rdev = cpu_to_le32(val);
445 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
447 return le16_to_cpu(i->flags);
450 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
452 i->flags = cpu_to_le16(val);
455 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
457 return le16_to_cpu(i->compat_flags);
460 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
463 i->compat_flags = cpu_to_le16(val);
466 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
468 return le64_to_cpu(ts->sec);
471 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
474 ts->sec = cpu_to_le64(val);
477 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
479 return le32_to_cpu(ts->nsec);
482 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
485 ts->nsec = cpu_to_le32(val);
488 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
490 return le32_to_cpu(ei->refs);
493 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
495 ei->refs = cpu_to_le32(val);
498 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
500 return le64_to_cpu(ei->owner);
503 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
505 ei->owner = cpu_to_le64(val);
508 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
510 return le64_to_cpu(n->ptrs[nr].blockptr);
514 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
517 n->ptrs[nr].blockptr = cpu_to_le64(val);
520 static inline u32 btrfs_item_offset(struct btrfs_item *item)
522 return le32_to_cpu(item->offset);
525 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
527 item->offset = cpu_to_le32(val);
530 static inline u32 btrfs_item_end(struct btrfs_item *item)
532 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
535 static inline u16 btrfs_item_size(struct btrfs_item *item)
537 return le16_to_cpu(item->size);
540 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
542 item->size = cpu_to_le16(val);
545 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
547 return le16_to_cpu(d->flags);
550 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
552 d->flags = cpu_to_le16(val);
555 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
560 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
565 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
567 return le16_to_cpu(d->name_len);
570 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
572 d->name_len = cpu_to_le16(val);
575 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
576 struct btrfs_disk_key *disk)
578 cpu->offset = le64_to_cpu(disk->offset);
579 cpu->flags = le32_to_cpu(disk->flags);
580 cpu->objectid = le64_to_cpu(disk->objectid);
583 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
584 struct btrfs_key *cpu)
586 disk->offset = cpu_to_le64(cpu->offset);
587 disk->flags = cpu_to_le32(cpu->flags);
588 disk->objectid = cpu_to_le64(cpu->objectid);
591 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
593 return le64_to_cpu(disk->objectid);
596 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
599 disk->objectid = cpu_to_le64(val);
602 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
604 return le64_to_cpu(disk->offset);
607 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
610 disk->offset = cpu_to_le64(val);
613 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
615 return le32_to_cpu(disk->flags);
618 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
621 disk->flags = cpu_to_le32(val);
624 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
626 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
629 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
632 u32 flags = btrfs_disk_key_flags(key);
633 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
634 val = val << BTRFS_KEY_TYPE_SHIFT;
635 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
636 btrfs_set_disk_key_flags(key, flags);
639 static inline u32 btrfs_key_type(struct btrfs_key *key)
641 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
644 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
646 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
647 val = val << BTRFS_KEY_TYPE_SHIFT;
648 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
651 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
653 return le64_to_cpu(h->blocknr);
656 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
658 h->blocknr = cpu_to_le64(blocknr);
661 static inline u64 btrfs_header_generation(struct btrfs_header *h)
663 return le64_to_cpu(h->generation);
666 static inline void btrfs_set_header_generation(struct btrfs_header *h,
669 h->generation = cpu_to_le64(val);
672 static inline u64 btrfs_header_owner(struct btrfs_header *h)
674 return le64_to_cpu(h->owner);
677 static inline void btrfs_set_header_owner(struct btrfs_header *h,
680 h->owner = cpu_to_le64(val);
683 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
685 return le16_to_cpu(h->nritems);
688 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
690 h->nritems = cpu_to_le16(val);
693 static inline u16 btrfs_header_flags(struct btrfs_header *h)
695 return le16_to_cpu(h->flags);
698 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
700 h->flags = cpu_to_le16(val);
703 static inline int btrfs_header_level(struct btrfs_header *h)
708 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
710 BUG_ON(level > BTRFS_MAX_LEVEL);
714 static inline int btrfs_is_leaf(struct btrfs_node *n)
716 return (btrfs_header_level(&n->header) == 0);
719 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
721 return le64_to_cpu(item->blocknr);
724 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
726 item->blocknr = cpu_to_le64(val);
729 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
731 return le64_to_cpu(item->root_dirid);
734 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
736 item->root_dirid = cpu_to_le64(val);
739 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
741 return le32_to_cpu(item->refs);
744 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
746 item->refs = cpu_to_le32(val);
749 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
751 return le64_to_cpu(s->blocknr);
754 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
756 s->blocknr = cpu_to_le64(val);
759 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
761 return le64_to_cpu(s->generation);
764 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
767 s->generation = cpu_to_le64(val);
770 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
772 return le64_to_cpu(s->root);
775 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
777 s->root = cpu_to_le64(val);
780 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
782 return le64_to_cpu(s->total_blocks);
785 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
788 s->total_blocks = cpu_to_le64(val);
791 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
793 return le64_to_cpu(s->blocks_used);
796 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
799 s->blocks_used = cpu_to_le64(val);
802 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
804 return le32_to_cpu(s->blocksize);
807 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
810 s->blocksize = cpu_to_le32(val);
813 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
815 return le64_to_cpu(s->root_dir_objectid);
818 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
821 s->root_dir_objectid = cpu_to_le64(val);
824 static inline u64 btrfs_super_last_device_id(struct btrfs_super_block *s)
826 return le64_to_cpu(s->last_device_id);
829 static inline void btrfs_set_super_last_device_id(struct btrfs_super_block *s,
832 s->last_device_id = cpu_to_le64(val);
835 static inline u64 btrfs_super_device_id(struct btrfs_super_block *s)
837 return le64_to_cpu(s->device_id);
840 static inline void btrfs_set_super_device_id(struct btrfs_super_block *s,
843 s->device_id = cpu_to_le64(val);
846 static inline u64 btrfs_super_device_block_start(struct btrfs_super_block *s)
848 return le64_to_cpu(s->device_block_start);
851 static inline void btrfs_set_super_device_block_start(struct btrfs_super_block
854 s->device_block_start = cpu_to_le64(val);
857 static inline u64 btrfs_super_device_num_blocks(struct btrfs_super_block *s)
859 return le64_to_cpu(s->device_num_blocks);
862 static inline void btrfs_set_super_device_num_blocks(struct btrfs_super_block
865 s->device_num_blocks = cpu_to_le64(val);
868 static inline u64 btrfs_super_device_root(struct btrfs_super_block *s)
870 return le64_to_cpu(s->device_root);
873 static inline void btrfs_set_super_device_root(struct btrfs_super_block
876 s->device_root = cpu_to_le64(val);
879 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
881 return (u8 *)l->items;
884 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
888 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
894 static inline char *btrfs_file_extent_inline_start(struct
895 btrfs_file_extent_item *e)
897 return (char *)(&e->disk_blocknr);
900 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
902 return (unsigned long)(&((struct
903 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
906 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
908 struct btrfs_file_extent_item *fe = NULL;
909 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
912 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
915 return le64_to_cpu(e->disk_blocknr);
918 static inline void btrfs_set_file_extent_disk_blocknr(struct
919 btrfs_file_extent_item
922 e->disk_blocknr = cpu_to_le64(val);
925 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
927 return le64_to_cpu(e->generation);
930 static inline void btrfs_set_file_extent_generation(struct
931 btrfs_file_extent_item *e,
934 e->generation = cpu_to_le64(val);
937 static inline u64 btrfs_file_extent_disk_num_blocks(struct
938 btrfs_file_extent_item *e)
940 return le64_to_cpu(e->disk_num_blocks);
943 static inline void btrfs_set_file_extent_disk_num_blocks(struct
944 btrfs_file_extent_item
947 e->disk_num_blocks = cpu_to_le64(val);
950 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
952 return le64_to_cpu(e->offset);
955 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
958 e->offset = cpu_to_le64(val);
961 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
964 return le64_to_cpu(e->num_blocks);
967 static inline void btrfs_set_file_extent_num_blocks(struct
968 btrfs_file_extent_item *e,
971 e->num_blocks = cpu_to_le64(val);
974 static inline u16 btrfs_device_pathlen(struct btrfs_device_item *d)
976 return le16_to_cpu(d->pathlen);
979 static inline void btrfs_set_device_pathlen(struct btrfs_device_item *d,
982 d->pathlen = cpu_to_le16(val);
985 static inline u64 btrfs_device_id(struct btrfs_device_item *d)
987 return le64_to_cpu(d->device_id);
990 static inline void btrfs_set_device_id(struct btrfs_device_item *d,
993 d->device_id = cpu_to_le64(val);
996 /* helper function to cast into the data area of the leaf. */
997 #define btrfs_item_ptr(leaf, slot, type) \
998 ((type *)(btrfs_leaf_data(leaf) + \
999 btrfs_item_offset((leaf)->items + (slot))))
1001 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
1002 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1003 *root, struct btrfs_path *path, u32 data_size);
1004 struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1005 struct btrfs_root *root);
1006 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1007 struct btrfs_buffer *buf);
1008 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1009 *root, u64 blocknr, u64 num_blocks, int pin);
1010 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1011 *root, struct btrfs_key *key, struct btrfs_path *p, int
1013 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1014 void btrfs_init_path(struct btrfs_path *p);
1015 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1016 struct btrfs_path *path);
1017 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1018 *root, struct btrfs_key *key, void *data, u32 data_size);
1019 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1020 *root, struct btrfs_path *path, struct btrfs_key
1021 *cpu_key, u32 data_size);
1022 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1023 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1024 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1025 *root, struct btrfs_buffer *snap);
1026 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1028 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1029 struct btrfs_key *key);
1030 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1031 *root, struct btrfs_key *key, struct btrfs_root_item
1033 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1034 *root, struct btrfs_key *key, struct btrfs_root_item
1036 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1037 btrfs_root_item *item, struct btrfs_key *key);
1038 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1039 *root, char *name, int name_len, u64 dir,
1040 struct btrfs_key *location, u8 type);
1041 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1042 *root, struct btrfs_path *path, u64 dir, char *name,
1043 int name_len, int mod);
1044 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
1045 char *name, int name_len);
1046 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1047 struct btrfs_root *fs_root,
1048 u64 dirid, u64 *objectid);
1049 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1050 *root, u64 objectid, struct btrfs_inode_item
1052 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1053 *root, struct btrfs_path *path, u64 objectid, int mod);
1054 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1055 struct btrfs_root *root);
1056 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1057 int btrfs_read_block_groups(struct btrfs_root *root);
1058 int btrfs_insert_block_group(struct btrfs_trans_handle *trans,
1059 struct btrfs_root *root,
1060 struct btrfs_key *key,
1061 struct btrfs_block_group_item *bi);