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 bytenr; /* 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 bytenr; /* this block number */
119 __le64 root_dir_objectid;
124 } __attribute__ ((__packed__));
127 * A leaf is full of items. offset and size tell us where to find
128 * the item in the leaf (relative to the start of the data area)
131 struct btrfs_disk_key key;
134 } __attribute__ ((__packed__));
137 * leaves have an item area and a data area:
138 * [item0, item1....itemN] [free space] [dataN...data1, data0]
140 * The data is separate from the items to get the keys closer together
144 struct btrfs_header header;
145 struct btrfs_item items[];
146 } __attribute__ ((__packed__));
149 * all non-leaf blocks are nodes, they hold only keys and pointers to
152 struct btrfs_key_ptr {
153 struct btrfs_disk_key key;
155 } __attribute__ ((__packed__));
158 struct btrfs_header header;
159 struct btrfs_key_ptr ptrs[];
160 } __attribute__ ((__packed__));
163 * btrfs_paths remember the path taken from the root down to the leaf.
164 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
165 * to any other levels that are present.
167 * The slots array records the index of the item or block pointer
168 * used while walking the tree.
171 struct btrfs_buffer *nodes[BTRFS_MAX_LEVEL];
172 int slots[BTRFS_MAX_LEVEL];
176 * items in the extent btree are used to record the objectid of the
177 * owner of the block and the number of references
179 struct btrfs_extent_item {
182 } __attribute__ ((__packed__));
184 struct btrfs_inode_timespec {
187 } __attribute__ ((__packed__));
190 * there is no padding here on purpose. If you want to extent the inode,
191 * make a new item type
193 struct btrfs_inode_item {
205 struct btrfs_inode_timespec atime;
206 struct btrfs_inode_timespec ctime;
207 struct btrfs_inode_timespec mtime;
208 struct btrfs_inode_timespec otime;
209 } __attribute__ ((__packed__));
211 /* inline data is just a blob of bytes */
212 struct btrfs_inline_data_item {
214 } __attribute__ ((__packed__));
216 struct btrfs_dir_item {
217 struct btrfs_disk_key location;
221 } __attribute__ ((__packed__));
223 struct btrfs_root_item {
224 struct btrfs_inode_item inode;
231 struct btrfs_disk_key drop_progress;
234 } __attribute__ ((__packed__));
236 #define BTRFS_FILE_EXTENT_REG 0
237 #define BTRFS_FILE_EXTENT_INLINE 1
239 struct btrfs_file_extent_item {
243 * disk space consumed by the extent, checksum blocks are included
247 __le64 disk_num_bytes;
249 * the logical offset in file blocks (no csums)
250 * this extent record is for. This allows a file extent to point
251 * into the middle of an existing extent on disk, sharing it
252 * between two snapshots (useful if some bytes in the middle of the
253 * extent have changed
257 * the logical number of file blocks (no csums included)
260 } __attribute__ ((__packed__));
262 struct btrfs_csum_item {
263 u8 csum[BTRFS_CSUM_SIZE];
264 } __attribute__ ((__packed__));
266 /* tag for the radix tree of block groups in ram */
267 #define BTRFS_BLOCK_GROUP_DIRTY 0
268 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
271 #define BTRFS_BLOCK_GROUP_DATA 1
272 struct btrfs_block_group_item {
275 } __attribute__ ((__packed__));
277 struct btrfs_block_group_cache {
278 struct btrfs_key key;
279 struct btrfs_block_group_item item;
282 struct btrfs_fs_info {
283 struct btrfs_root *fs_root;
284 struct btrfs_root *extent_root;
285 struct btrfs_root *tree_root;
286 struct btrfs_key last_insert;
287 struct radix_tree_root cache_radix;
288 struct radix_tree_root block_group_radix;
289 struct pending_tree pending_tree;
290 struct pending_tree pinned_tree;
291 struct pending_tree del_pending;
292 struct list_head trans;
293 struct list_head cache;
294 u64 last_inode_alloc;
295 u64 last_inode_alloc_dirid;
299 struct btrfs_trans_handle *running_transaction;
300 struct btrfs_super_block *disk_super;
304 * in ram representation of the tree. extent_root is used for all allocations
305 * and for the extent tree extent_root root.
308 struct btrfs_buffer *node;
309 struct btrfs_buffer *commit_root;
310 struct btrfs_root_item root_item;
311 struct btrfs_key root_key;
312 struct btrfs_fs_info *fs_info;
314 /* data allocations are done in sectorsize units */
317 /* node allocations are done in nodesize units */
320 /* leaf allocations are done in leafsize units */
327 /* the lower bits in the key flags defines the item type */
328 #define BTRFS_KEY_TYPE_MAX 256
329 #define BTRFS_KEY_TYPE_SHIFT 24
330 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
331 BTRFS_KEY_TYPE_SHIFT)
334 * inode items have the data typically returned from stat and store other
335 * info about object characteristics. There is one for every file and dir in
338 #define BTRFS_INODE_ITEM_KEY 1
340 /* reserve 2-15 close to the inode for later flexibility */
343 * dir items are the name -> inode pointers in a directory. There is one
344 * for every name in a directory.
346 #define BTRFS_DIR_ITEM_KEY 16
347 #define BTRFS_DIR_INDEX_KEY 17
349 * extent data is for file data
351 #define BTRFS_EXTENT_DATA_KEY 18
353 * csum items have the checksums for data in the extents
355 #define BTRFS_CSUM_ITEM_KEY 19
357 /* reserve 20-31 for other file stuff */
360 * root items point to tree roots. There are typically in the root
361 * tree used by the super block to find all the other trees
363 #define BTRFS_ROOT_ITEM_KEY 32
365 * extent items are in the extent map tree. These record which blocks
366 * are used, and how many references there are to each block
368 #define BTRFS_EXTENT_ITEM_KEY 33
371 * block groups give us hints into the extent allocation trees. Which
372 * blocks are free etc etc
374 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
377 * string items are for debugging. They just store a short string of
380 #define BTRFS_STRING_ITEM_KEY 253
383 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
385 return le64_to_cpu(bi->used);
388 static inline void btrfs_set_block_group_used(struct
389 btrfs_block_group_item *bi,
392 bi->used = cpu_to_le64(val);
395 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
397 return le64_to_cpu(i->generation);
400 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
403 i->generation = cpu_to_le64(val);
406 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
408 return le64_to_cpu(i->size);
411 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
413 i->size = cpu_to_le64(val);
416 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
418 return le64_to_cpu(i->nblocks);
421 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
423 i->nblocks = cpu_to_le64(val);
426 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
428 return le64_to_cpu(i->block_group);
431 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
434 i->block_group = cpu_to_le64(val);
437 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
439 return le32_to_cpu(i->nlink);
442 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
444 i->nlink = cpu_to_le32(val);
447 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
449 return le32_to_cpu(i->uid);
452 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
454 i->uid = cpu_to_le32(val);
457 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
459 return le32_to_cpu(i->gid);
462 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
464 i->gid = cpu_to_le32(val);
467 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
469 return le32_to_cpu(i->mode);
472 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
474 i->mode = cpu_to_le32(val);
477 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
479 return le32_to_cpu(i->rdev);
482 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
484 i->rdev = cpu_to_le32(val);
487 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
489 return le16_to_cpu(i->flags);
492 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
494 i->flags = cpu_to_le16(val);
497 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
499 return le16_to_cpu(i->compat_flags);
502 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
505 i->compat_flags = cpu_to_le16(val);
508 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
510 return le64_to_cpu(ts->sec);
513 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
516 ts->sec = cpu_to_le64(val);
519 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
521 return le32_to_cpu(ts->nsec);
524 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
527 ts->nsec = cpu_to_le32(val);
530 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
532 return le32_to_cpu(ei->refs);
535 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
537 ei->refs = cpu_to_le32(val);
540 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
542 return le64_to_cpu(ei->owner);
545 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
547 ei->owner = cpu_to_le64(val);
550 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
552 return le64_to_cpu(n->ptrs[nr].blockptr);
556 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
559 n->ptrs[nr].blockptr = cpu_to_le64(val);
562 static inline u32 btrfs_item_offset(struct btrfs_item *item)
564 return le32_to_cpu(item->offset);
567 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
569 item->offset = cpu_to_le32(val);
572 static inline u32 btrfs_item_end(struct btrfs_item *item)
574 return le32_to_cpu(item->offset) + le32_to_cpu(item->size);
577 static inline u32 btrfs_item_size(struct btrfs_item *item)
579 return le32_to_cpu(item->size);
582 static inline void btrfs_set_item_size(struct btrfs_item *item, u32 val)
584 item->size = cpu_to_le32(val);
587 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
589 return le16_to_cpu(d->flags);
592 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
594 d->flags = cpu_to_le16(val);
597 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
602 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
607 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
609 return le16_to_cpu(d->name_len);
612 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
614 d->name_len = cpu_to_le16(val);
617 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
618 struct btrfs_disk_key *disk)
620 cpu->offset = le64_to_cpu(disk->offset);
621 cpu->type = le32_to_cpu(disk->type);
622 cpu->objectid = le64_to_cpu(disk->objectid);
625 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
626 struct btrfs_key *cpu)
628 disk->offset = cpu_to_le64(cpu->offset);
629 disk->type = cpu_to_le32(cpu->type);
630 disk->objectid = cpu_to_le64(cpu->objectid);
633 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
635 return le64_to_cpu(disk->objectid);
638 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
641 disk->objectid = cpu_to_le64(val);
644 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
646 return le64_to_cpu(disk->offset);
649 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
652 disk->offset = cpu_to_le64(val);
655 static inline u8 btrfs_disk_key_type(struct btrfs_disk_key *key)
660 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key, u8 val)
665 static inline u32 btrfs_key_type(struct btrfs_key *key)
670 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
675 static inline u64 btrfs_header_bytenr(struct btrfs_header *h)
677 return le64_to_cpu(h->bytenr);
680 static inline void btrfs_set_header_bytenr(struct btrfs_header *h, u64 bytenr)
682 h->bytenr = cpu_to_le64(bytenr);
685 static inline u64 btrfs_header_generation(struct btrfs_header *h)
687 return le64_to_cpu(h->generation);
690 static inline void btrfs_set_header_generation(struct btrfs_header *h,
693 h->generation = cpu_to_le64(val);
696 static inline u64 btrfs_header_owner(struct btrfs_header *h)
698 return le64_to_cpu(h->owner);
701 static inline void btrfs_set_header_owner(struct btrfs_header *h,
704 h->owner = cpu_to_le64(val);
707 static inline u32 btrfs_header_nritems(struct btrfs_header *h)
709 return le32_to_cpu(h->nritems);
712 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u32 val)
714 h->nritems = cpu_to_le32(val);
717 static inline u16 btrfs_header_flags(struct btrfs_header *h)
719 return le16_to_cpu(h->flags);
722 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
724 h->flags = cpu_to_le16(val);
727 static inline int btrfs_header_level(struct btrfs_header *h)
732 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
734 BUG_ON(level > BTRFS_MAX_LEVEL);
738 static inline int btrfs_is_leaf(struct btrfs_node *n)
740 return (btrfs_header_level(&n->header) == 0);
743 static inline u64 btrfs_root_bytenr(struct btrfs_root_item *item)
745 return le64_to_cpu(item->bytenr);
748 static inline void btrfs_set_root_bytenr(struct btrfs_root_item *item, u64 val)
750 item->bytenr = cpu_to_le64(val);
753 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
755 return le64_to_cpu(item->root_dirid);
758 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
760 item->root_dirid = cpu_to_le64(val);
763 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
765 return le32_to_cpu(item->refs);
768 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
770 item->refs = cpu_to_le32(val);
773 static inline u32 btrfs_root_flags(struct btrfs_root_item *item)
775 return le32_to_cpu(item->flags);
778 static inline void btrfs_set_root_flags(struct btrfs_root_item *item, u32 val)
780 item->flags = cpu_to_le32(val);
783 static inline void btrfs_set_root_bytes_used(struct btrfs_root_item *item,
786 item->bytes_used = cpu_to_le64(val);
789 static inline u64 btrfs_root_bytes_used(struct btrfs_root_item *item)
791 return le64_to_cpu(item->bytes_used);
794 static inline u64 btrfs_super_bytenr(struct btrfs_super_block *s)
796 return le64_to_cpu(s->bytenr);
799 static inline void btrfs_set_super_bytenr(struct btrfs_super_block *s, u64 val)
801 s->bytenr = cpu_to_le64(val);
804 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
806 return le64_to_cpu(s->generation);
809 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
812 s->generation = cpu_to_le64(val);
815 static inline u8 btrfs_super_root_level(struct btrfs_super_block *s)
817 return s->root_level;
820 static inline void btrfs_set_super_root_level(struct btrfs_super_block *s,
826 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
828 return le64_to_cpu(s->root);
831 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
833 s->root = cpu_to_le64(val);
836 static inline u64 btrfs_super_total_bytes(struct btrfs_super_block *s)
838 return le64_to_cpu(s->total_bytes);
841 static inline void btrfs_set_super_total_bytes(struct btrfs_super_block *s,
844 s->total_bytes = cpu_to_le64(val);
847 static inline u64 btrfs_super_bytes_used(struct btrfs_super_block *s)
849 return le64_to_cpu(s->bytes_used);
852 static inline void btrfs_set_super_bytes_used(struct btrfs_super_block *s,
855 s->bytes_used = cpu_to_le64(val);
858 static inline u32 btrfs_super_sectorsize(struct btrfs_super_block *s)
860 return le32_to_cpu(s->sectorsize);
863 static inline void btrfs_set_super_sectorsize(struct btrfs_super_block *s,
866 s->sectorsize = cpu_to_le32(val);
869 static inline u32 btrfs_super_nodesize(struct btrfs_super_block *s)
871 return le32_to_cpu(s->nodesize);
874 static inline void btrfs_set_super_nodesize(struct btrfs_super_block *s,
877 s->nodesize = cpu_to_le32(val);
880 static inline u32 btrfs_super_leafsize(struct btrfs_super_block *s)
882 return le32_to_cpu(s->leafsize);
885 static inline void btrfs_set_super_leafsize(struct btrfs_super_block *s,
888 s->leafsize = cpu_to_le32(val);
891 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
893 return le64_to_cpu(s->root_dir_objectid);
896 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
899 s->root_dir_objectid = cpu_to_le64(val);
902 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
904 return (u8 *)l->items;
907 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
911 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
917 static inline char *btrfs_file_extent_inline_start(struct
918 btrfs_file_extent_item *e)
920 return (char *)(&e->disk_bytenr);
923 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
925 return (unsigned long)(&((struct
926 btrfs_file_extent_item *)NULL)->disk_bytenr) + datasize;
929 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
931 struct btrfs_file_extent_item *fe = NULL;
932 return btrfs_item_size(e) - (unsigned long)(&fe->disk_bytenr);
935 static inline u64 btrfs_file_extent_disk_bytenr(struct btrfs_file_extent_item
938 return le64_to_cpu(e->disk_bytenr);
941 static inline void btrfs_set_file_extent_disk_bytenr(struct
942 btrfs_file_extent_item
945 e->disk_bytenr = cpu_to_le64(val);
948 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
950 return le64_to_cpu(e->generation);
953 static inline void btrfs_set_file_extent_generation(struct
954 btrfs_file_extent_item *e,
957 e->generation = cpu_to_le64(val);
960 static inline u64 btrfs_file_extent_disk_num_bytes(struct
961 btrfs_file_extent_item *e)
963 return le64_to_cpu(e->disk_num_bytes);
966 static inline void btrfs_set_file_extent_disk_num_bytes(struct
967 btrfs_file_extent_item
970 e->disk_num_bytes = cpu_to_le64(val);
973 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
975 return le64_to_cpu(e->offset);
978 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
981 e->offset = cpu_to_le64(val);
984 static inline u64 btrfs_file_extent_num_bytes(struct btrfs_file_extent_item
987 return le64_to_cpu(e->num_bytes);
990 static inline void btrfs_set_file_extent_num_bytes(struct
991 btrfs_file_extent_item *e,
994 e->num_bytes = cpu_to_le64(val);
997 /* helper function to cast into the data area of the leaf. */
998 #define btrfs_item_ptr(leaf, slot, type) \
999 ((type *)(btrfs_leaf_data(leaf) + \
1000 btrfs_item_offset((leaf)->items + (slot))))
1002 static inline u32 btrfs_level_size(struct btrfs_root *root, int level)
1005 return root->leafsize;
1006 return root->nodesize;
1008 int btrfs_comp_keys(struct btrfs_disk_key *disk, struct btrfs_key *k2);
1009 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1010 *root, struct btrfs_path *path, u32 data_size);
1011 struct btrfs_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1012 struct btrfs_root *root,
1014 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1015 struct btrfs_buffer *buf);
1016 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1017 *root, u64 bytenr, u64 num_bytes, int pin);
1018 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1019 *root, struct btrfs_key *key, struct btrfs_path *p, int
1021 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1022 void btrfs_init_path(struct btrfs_path *p);
1023 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1024 struct btrfs_path *path);
1025 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1026 *root, struct btrfs_key *key, void *data, u32 data_size);
1027 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1028 *root, struct btrfs_path *path, struct btrfs_key
1029 *cpu_key, u32 data_size);
1030 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1031 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1032 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1033 *root, struct btrfs_buffer *snap);
1034 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1036 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1037 struct btrfs_key *key);
1038 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1039 *root, struct btrfs_key *key, struct btrfs_root_item
1041 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1042 *root, struct btrfs_key *key, struct btrfs_root_item
1044 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1045 btrfs_root_item *item, struct btrfs_key *key);
1046 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1047 *root, char *name, int name_len, u64 dir,
1048 struct btrfs_key *location, u8 type);
1049 int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1050 *root, struct btrfs_path *path, u64 dir, char *name,
1051 int name_len, int mod);
1052 int btrfs_match_dir_item_name(struct btrfs_root *root, struct btrfs_path *path,
1053 char *name, int name_len);
1054 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1055 struct btrfs_root *fs_root,
1056 u64 dirid, u64 *objectid);
1057 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1058 *root, u64 objectid, struct btrfs_inode_item
1060 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1061 *root, struct btrfs_path *path, u64 objectid, int mod);
1062 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1063 struct btrfs_root *root);
1064 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1065 int btrfs_read_block_groups(struct btrfs_root *root);
1066 int btrfs_insert_block_group(struct btrfs_trans_handle *trans,
1067 struct btrfs_root *root,
1068 struct btrfs_key *key,
1069 struct btrfs_block_group_item *bi);