2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
23 #include "kerncompat.h"
24 #include "pending-extent.h"
26 struct btrfs_trans_handle;
28 #define BTRFS_MAGIC "_B2RfS_M"
30 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
31 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
32 #define BTRFS_FS_TREE_OBJECTID 3ULL
33 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
34 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
37 * we can actually store much bigger names, but lets not confuse the rest
40 #define BTRFS_NAME_LEN 255
42 /* 32 bytes in various csum fields */
43 #define BTRFS_CSUM_SIZE 32
44 /* four bytes for CRC32 */
45 #define BTRFS_CRC32_SIZE 4
47 #define BTRFS_FT_UNKNOWN 0
48 #define BTRFS_FT_REG_FILE 1
49 #define BTRFS_FT_DIR 2
50 #define BTRFS_FT_CHRDEV 3
51 #define BTRFS_FT_BLKDEV 4
52 #define BTRFS_FT_FIFO 5
53 #define BTRFS_FT_SOCK 6
54 #define BTRFS_FT_SYMLINK 7
55 #define BTRFS_FT_MAX 8
58 * the key defines the order in the tree, and so it also defines (optimal)
59 * block layout. objectid corresonds to the inode number. The flags
60 * tells us things about the object, and is a kind of stream selector.
61 * so for a given inode, keys with flags of 1 might refer to the inode
62 * data, flags of 2 may point to file data in the btree and flags == 3
63 * may point to extents.
65 * offset is the starting byte offset for this key in the stream.
67 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
68 * in cpu native order. Otherwise they are identical and their sizes
69 * should be the same (ie both packed)
71 struct btrfs_disk_key {
75 } __attribute__ ((__packed__));
81 } __attribute__ ((__packed__));
84 * every tree block (leaf or node) starts with this header.
87 u8 csum[BTRFS_CSUM_SIZE];
88 u8 fsid[16]; /* FS specific uuid */
89 __le64 blocknr; /* which block this node is supposed to live in */
95 } __attribute__ ((__packed__));
97 #define BTRFS_MAX_LEVEL 8
98 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
99 sizeof(struct btrfs_header)) / \
100 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
101 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
102 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
106 * the super block basically lists the main trees of the FS
107 * it currently lacks any block count etc etc
109 struct btrfs_super_block {
110 u8 csum[BTRFS_CSUM_SIZE];
111 /* the first 3 fields must match struct btrfs_header */
112 u8 fsid[16]; /* FS specific uuid */
113 __le64 blocknr; /* this block number */
119 __le64 root_dir_objectid;
123 } __attribute__ ((__packed__));
126 * A leaf is full of items. offset and size tell us where to find
127 * the item in the leaf (relative to the start of the data area)
130 struct btrfs_disk_key key;
133 } __attribute__ ((__packed__));
136 * leaves have an item area and a data area:
137 * [item0, item1....itemN] [free space] [dataN...data1, data0]
139 * The data is separate from the items to get the keys closer together
143 struct btrfs_header header;
144 struct btrfs_item items[];
145 } __attribute__ ((__packed__));
148 * all non-leaf blocks are nodes, they hold only keys and pointers to
151 struct btrfs_key_ptr {
152 struct btrfs_disk_key key;
154 } __attribute__ ((__packed__));
157 struct btrfs_header header;
158 struct btrfs_key_ptr ptrs[];
159 } __attribute__ ((__packed__));
162 * btrfs_paths remember the path taken from the root down to the leaf.
163 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
164 * to any other levels that are present.
166 * The slots array records the index of the item or block pointer
167 * used while walking the tree.
170 struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL];
171 int slots[BTRFS_MAX_LEVEL];
175 * items in the extent btree are used to record the objectid of the
176 * owner of the block and the number of references
178 struct btrfs_extent_item {
181 } __attribute__ ((__packed__));
183 struct btrfs_inode_timespec {
186 } __attribute__ ((__packed__));
189 * there is no padding here on purpose. If you want to extent the inode,
190 * make a new item type
192 struct btrfs_inode_item {
204 struct btrfs_inode_timespec atime;
205 struct btrfs_inode_timespec ctime;
206 struct btrfs_inode_timespec mtime;
207 struct btrfs_inode_timespec otime;
208 } __attribute__ ((__packed__));
210 /* inline data is just a blob of bytes */
211 struct btrfs_inline_data_item {
213 } __attribute__ ((__packed__));
215 struct btrfs_dir_item {
216 struct btrfs_disk_key location;
220 } __attribute__ ((__packed__));
222 struct btrfs_root_item {
223 struct btrfs_inode_item inode;
230 struct btrfs_disk_key drop_progress;
232 } __attribute__ ((__packed__));
234 #define BTRFS_FILE_EXTENT_REG 0
235 #define BTRFS_FILE_EXTENT_INLINE 1
237 struct btrfs_file_extent_item {
241 * disk space consumed by the extent, checksum blocks are included
245 __le64 disk_num_blocks;
247 * the logical offset in file blocks (no csums)
248 * this extent record is for. This allows a file extent to point
249 * into the middle of an existing extent on disk, sharing it
250 * between two snapshots (useful if some bytes in the middle of the
251 * extent have changed
255 * the logical number of file blocks (no csums included)
258 } __attribute__ ((__packed__));
260 struct btrfs_csum_item {
261 u8 csum[BTRFS_CSUM_SIZE];
262 } __attribute__ ((__packed__));
264 /* tag for the radix tree of block groups in ram */
265 #define BTRFS_BLOCK_GROUP_DIRTY 0
266 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
269 #define BTRFS_BLOCK_GROUP_DATA 1
270 struct btrfs_block_group_item {
273 } __attribute__ ((__packed__));
275 struct btrfs_block_group_cache {
276 struct btrfs_key key;
277 struct btrfs_block_group_item item;
280 struct btrfs_fs_info {
281 struct btrfs_root *fs_root;
282 struct btrfs_root *extent_root;
283 struct btrfs_root *tree_root;
284 struct btrfs_key last_insert;
285 struct radix_tree_root cache_radix;
286 struct radix_tree_root block_group_radix;
287 struct pending_tree pending_tree;
288 struct pending_tree pinned_tree;
289 struct pending_tree del_pending;
290 struct list_head trans;
291 struct list_head cache;
292 u64 last_inode_alloc;
293 u64 last_inode_alloc_dirid;
297 struct btrfs_trans_handle *running_transaction;
298 struct btrfs_super_block *disk_super;
302 * in ram representation of the tree. extent_root is used for all allocations
303 * and for the extent tree extent_root root.
306 struct btrfs_buffer *node;
307 struct btrfs_buffer *commit_root;
308 struct btrfs_root_item root_item;
309 struct btrfs_key root_key;
310 struct btrfs_fs_info *fs_info;
312 /* data allocations are done in sectorsize units */
315 /* node allocations are done in nodesize units */
318 /* leaf allocations are done in leafsize units */
325 /* the lower bits in the key flags defines the item type */
326 #define BTRFS_KEY_TYPE_MAX 256
327 #define BTRFS_KEY_TYPE_SHIFT 24
328 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
329 BTRFS_KEY_TYPE_SHIFT)
332 * inode items have the data typically returned from stat and store other
333 * info about object characteristics. There is one for every file and dir in
336 #define BTRFS_INODE_ITEM_KEY 1
338 /* reserve 2-15 close to the inode for later flexibility */
341 * dir items are the name -> inode pointers in a directory. There is one
342 * for every name in a directory.
344 #define BTRFS_DIR_ITEM_KEY 16
345 #define BTRFS_DIR_INDEX_KEY 17
347 * extent data is for file data
349 #define BTRFS_EXTENT_DATA_KEY 18
351 * csum items have the checksums for data in the extents
353 #define BTRFS_CSUM_ITEM_KEY 19
355 /* reserve 20-31 for other file stuff */
358 * root items point to tree roots. There are typically in the root
359 * tree used by the super block to find all the other trees
361 #define BTRFS_ROOT_ITEM_KEY 32
363 * extent items are in the extent map tree. These record which blocks
364 * are used, and how many references there are to each block
366 #define BTRFS_EXTENT_ITEM_KEY 33
369 * block groups give us hints into the extent allocation trees. Which
370 * blocks are free etc etc
372 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
375 * string items are for debugging. They just store a short string of
378 #define BTRFS_STRING_ITEM_KEY 253
381 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
383 return le64_to_cpu(bi->used);
386 static inline void btrfs_set_block_group_used(struct
387 btrfs_block_group_item *bi,
390 bi->used = cpu_to_le64(val);
393 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
395 return le64_to_cpu(i->generation);
398 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
401 i->generation = cpu_to_le64(val);
404 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
406 return le64_to_cpu(i->size);
409 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
411 i->size = cpu_to_le64(val);
414 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
416 return le64_to_cpu(i->nblocks);
419 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
421 i->nblocks = cpu_to_le64(val);
424 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
426 return le64_to_cpu(i->block_group);
429 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
432 i->block_group = cpu_to_le64(val);
435 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
437 return le32_to_cpu(i->nlink);
440 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
442 i->nlink = cpu_to_le32(val);
445 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
447 return le32_to_cpu(i->uid);
450 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
452 i->uid = cpu_to_le32(val);
455 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
457 return le32_to_cpu(i->gid);
460 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
462 i->gid = cpu_to_le32(val);
465 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
467 return le32_to_cpu(i->mode);
470 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
472 i->mode = cpu_to_le32(val);
475 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
477 return le32_to_cpu(i->rdev);
480 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
482 i->rdev = cpu_to_le32(val);
485 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
487 return le16_to_cpu(i->flags);
490 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
492 i->flags = cpu_to_le16(val);
495 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
497 return le16_to_cpu(i->compat_flags);
500 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
503 i->compat_flags = cpu_to_le16(val);
506 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
508 return le64_to_cpu(ts->sec);
511 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
514 ts->sec = cpu_to_le64(val);
517 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
519 return le32_to_cpu(ts->nsec);
522 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
525 ts->nsec = cpu_to_le32(val);
528 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
530 return le32_to_cpu(ei->refs);
533 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
535 ei->refs = cpu_to_le32(val);
538 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
540 return le64_to_cpu(ei->owner);
543 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
545 ei->owner = cpu_to_le64(val);
548 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
550 return le64_to_cpu(n->ptrs[nr].blockptr);
554 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
557 n->ptrs[nr].blockptr = cpu_to_le64(val);
560 static inline u32 btrfs_item_offset(struct btrfs_item *item)
562 return le32_to_cpu(item->offset);
565 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
567 item->offset = cpu_to_le32(val);
570 static inline u32 btrfs_item_end(struct btrfs_item *item)
572 return le32_to_cpu(item->offset) + le32_to_cpu(item->size);
575 static inline u32 btrfs_item_size(struct btrfs_item *item)
577 return le32_to_cpu(item->size);
580 static inline void btrfs_set_item_size(struct btrfs_item *item, u32 val)
582 item->size = cpu_to_le32(val);
585 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
587 return le16_to_cpu(d->flags);
590 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
592 d->flags = cpu_to_le16(val);
595 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
600 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
605 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
607 return le16_to_cpu(d->name_len);
610 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
612 d->name_len = cpu_to_le16(val);
615 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
616 struct btrfs_disk_key *disk)
618 cpu->offset = le64_to_cpu(disk->offset);
619 cpu->type = le32_to_cpu(disk->type);
620 cpu->objectid = le64_to_cpu(disk->objectid);
623 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
624 struct btrfs_key *cpu)
626 disk->offset = cpu_to_le64(cpu->offset);
627 disk->type = cpu_to_le32(cpu->type);
628 disk->objectid = cpu_to_le64(cpu->objectid);
631 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
633 return le64_to_cpu(disk->objectid);
636 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
639 disk->objectid = cpu_to_le64(val);
642 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
644 return le64_to_cpu(disk->offset);
647 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
650 disk->offset = cpu_to_le64(val);
653 static inline u8 btrfs_disk_key_type(struct btrfs_disk_key *key)
658 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u8 val)
663 static inline u32 btrfs_key_type(struct btrfs_key *key)
668 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
673 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
675 return le64_to_cpu(h->blocknr);
678 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
680 h->blocknr = cpu_to_le64(blocknr);
683 static inline u64 btrfs_header_generation(struct btrfs_header *h)
685 return le64_to_cpu(h->generation);
688 static inline void btrfs_set_header_generation(struct btrfs_header *h,
691 h->generation = cpu_to_le64(val);
694 static inline u64 btrfs_header_owner(struct btrfs_header *h)
696 return le64_to_cpu(h->owner);
699 static inline void btrfs_set_header_owner(struct btrfs_header *h,
702 h->owner = cpu_to_le64(val);
705 static inline u32 btrfs_header_nritems(struct btrfs_header *h)
707 return le32_to_cpu(h->nritems);
710 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u32 val)
712 h->nritems = cpu_to_le32(val);
715 static inline u16 btrfs_header_flags(struct btrfs_header *h)
717 return le16_to_cpu(h->flags);
720 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
722 h->flags = cpu_to_le16(val);
725 static inline int btrfs_header_level(struct btrfs_header *h)
730 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
732 BUG_ON(level > BTRFS_MAX_LEVEL);
736 static inline int btrfs_is_leaf(struct btrfs_node *n)
738 return (btrfs_header_level(&n->header) == 0);
741 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
743 return le64_to_cpu(item->blocknr);
746 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
748 item->blocknr = cpu_to_le64(val);
751 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
753 return le64_to_cpu(item->root_dirid);
756 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
758 item->root_dirid = cpu_to_le64(val);
761 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
763 return le32_to_cpu(item->refs);
766 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
768 item->refs = cpu_to_le32(val);
771 static inline u32 btrfs_root_flags(struct btrfs_root_item *item)
773 return le32_to_cpu(item->flags);
776 static inline void btrfs_set_root_flags(struct btrfs_root_item *item, u32 val)
778 item->flags = cpu_to_le32(val);
781 static inline void btrfs_set_root_blocks_used(struct btrfs_root_item *item,
784 item->blocks_used = cpu_to_le64(val);
787 static inline u64 btrfs_root_blocks_used(struct btrfs_root_item *item)
789 return le64_to_cpu(item->blocks_used);
792 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
794 return le64_to_cpu(s->blocknr);
797 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
799 s->blocknr = cpu_to_le64(val);
802 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
804 return le64_to_cpu(s->generation);
807 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
810 s->generation = cpu_to_le64(val);
813 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
815 return le64_to_cpu(s->root);
818 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
820 s->root = cpu_to_le64(val);
823 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
825 return le64_to_cpu(s->total_blocks);
828 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
831 s->total_blocks = cpu_to_le64(val);
834 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
836 return le64_to_cpu(s->blocks_used);
839 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
842 s->blocks_used = cpu_to_le64(val);
845 static inline u32 btrfs_super_sectorsize(struct btrfs_super_block *s)
847 return le32_to_cpu(s->sectorsize);
850 static inline void btrfs_set_super_sectorsize(struct btrfs_super_block *s,
853 s->sectorsize = cpu_to_le32(val);
856 static inline u32 btrfs_super_nodesize(struct btrfs_super_block *s)
858 return le32_to_cpu(s->nodesize);
861 static inline void btrfs_set_super_nodesize(struct btrfs_super_block *s,
864 s->nodesize = cpu_to_le32(val);
867 static inline u32 btrfs_super_leafsize(struct btrfs_super_block *s)
869 return le32_to_cpu(s->leafsize);
872 static inline void btrfs_set_super_leafsize(struct btrfs_super_block *s,
875 s->leafsize = cpu_to_le32(val);
878 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
880 return le64_to_cpu(s->root_dir_objectid);
883 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
886 s->root_dir_objectid = cpu_to_le64(val);
889 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
891 return (u8 *)l->items;
894 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
898 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
904 static inline char *btrfs_file_extent_inline_start(struct
905 btrfs_file_extent_item *e)
907 return (char *)(&e->disk_blocknr);
910 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
912 return (unsigned long)(&((struct
913 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
916 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
918 struct btrfs_file_extent_item *fe = NULL;
919 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
922 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
925 return le64_to_cpu(e->disk_blocknr);
928 static inline void btrfs_set_file_extent_disk_blocknr(struct
929 btrfs_file_extent_item
932 e->disk_blocknr = cpu_to_le64(val);
935 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
937 return le64_to_cpu(e->generation);
940 static inline void btrfs_set_file_extent_generation(struct
941 btrfs_file_extent_item *e,
944 e->generation = cpu_to_le64(val);
947 static inline u64 btrfs_file_extent_disk_num_blocks(struct
948 btrfs_file_extent_item *e)
950 return le64_to_cpu(e->disk_num_blocks);
953 static inline void btrfs_set_file_extent_disk_num_blocks(struct
954 btrfs_file_extent_item
957 e->disk_num_blocks = cpu_to_le64(val);
960 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
962 return le64_to_cpu(e->offset);
965 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
968 e->offset = cpu_to_le64(val);
971 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
974 return le64_to_cpu(e->num_blocks);
977 static inline void btrfs_set_file_extent_num_blocks(struct
978 btrfs_file_extent_item *e,
981 e->num_blocks = cpu_to_le64(val);
984 /* helper function to cast into the data area of the leaf. */
985 #define btrfs_item_ptr(leaf, slot, type) \
986 ((type *)(btrfs_leaf_data(leaf) + \
987 btrfs_item_offset((leaf)->items + (slot))))
989 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
990 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
991 *root, struct btrfs_path *path, u32 data_size);
992 struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
993 struct btrfs_root *root);
994 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
995 struct btrfs_buffer *buf);
996 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
997 *root, u64 blocknr, u64 num_blocks, int pin);
998 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
999 *root, struct btrfs_key *key, struct btrfs_path *p, int
1001 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1002 void btrfs_init_path(struct btrfs_path *p);
1003 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1004 struct btrfs_path *path);
1005 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1006 *root, struct btrfs_key *key, void *data, u32 data_size);
1007 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1008 *root, struct btrfs_path *path, struct btrfs_key
1009 *cpu_key, u32 data_size);
1010 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1011 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1012 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1013 *root, struct btrfs_buffer *snap);
1014 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1016 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1017 struct btrfs_key *key);
1018 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1019 *root, struct btrfs_key *key, struct btrfs_root_item
1021 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1022 *root, struct btrfs_key *key, struct btrfs_root_item
1024 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1025 btrfs_root_item *item, struct btrfs_key *key);
1026 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1027 *root, char *name, int name_len, u64 dir,
1028 struct btrfs_key *location, u8 type);
1029 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1030 *root, struct btrfs_path *path, u64 dir, char *name,
1031 int name_len, int mod);
1032 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
1033 char *name, int name_len);
1034 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1035 struct btrfs_root *fs_root,
1036 u64 dirid, u64 *objectid);
1037 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1038 *root, u64 objectid, struct btrfs_inode_item
1040 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1041 *root, struct btrfs_path *path, u64 objectid, int mod);
1042 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1043 struct btrfs_root *root);
1044 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1045 int btrfs_read_block_groups(struct btrfs_root *root);
1046 int btrfs_insert_block_group(struct btrfs_trans_handle *trans,
1047 struct btrfs_root *root,
1048 struct btrfs_key *key,
1049 struct btrfs_block_group_item *bi);