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 <linux/buffer_head.h>
24 #include <linux/workqueue.h>
25 #include "bit-radix.h"
27 struct btrfs_trans_handle;
28 struct btrfs_transaction;
29 extern struct kmem_cache *btrfs_trans_handle_cachep;
30 extern struct kmem_cache *btrfs_transaction_cachep;
31 extern struct kmem_cache *btrfs_bit_radix_cachep;
32 extern struct kmem_cache *btrfs_path_cachep;
34 #define BTRFS_MAGIC "_BtRfS_M"
36 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
37 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
38 #define BTRFS_FS_TREE_OBJECTID 3ULL
39 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
40 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
43 * we can actually store much bigger names, but lets not confuse the rest
46 #define BTRFS_NAME_LEN 255
48 /* 32 bytes in various csum fields */
49 #define BTRFS_CSUM_SIZE 32
50 /* four bytes for CRC32 */
51 #define BTRFS_CRC32_SIZE 4
52 #define BTRFS_EMPTY_DIR_SIZE 6
54 #define BTRFS_FT_UNKNOWN 0
55 #define BTRFS_FT_REG_FILE 1
56 #define BTRFS_FT_DIR 2
57 #define BTRFS_FT_CHRDEV 3
58 #define BTRFS_FT_BLKDEV 4
59 #define BTRFS_FT_FIFO 5
60 #define BTRFS_FT_SOCK 6
61 #define BTRFS_FT_SYMLINK 7
62 #define BTRFS_FT_MAX 8
65 * the key defines the order in the tree, and so it also defines (optimal)
66 * block layout. objectid corresonds to the inode number. The flags
67 * tells us things about the object, and is a kind of stream selector.
68 * so for a given inode, keys with flags of 1 might refer to the inode
69 * data, flags of 2 may point to file data in the btree and flags == 3
70 * may point to extents.
72 * offset is the starting byte offset for this key in the stream.
74 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
75 * in cpu native order. Otherwise they are identical and their sizes
76 * should be the same (ie both packed)
78 struct btrfs_disk_key {
82 } __attribute__ ((__packed__));
88 } __attribute__ ((__packed__));
91 * every tree block (leaf or node) starts with this header.
94 u8 csum[BTRFS_CSUM_SIZE];
95 u8 fsid[16]; /* FS specific uuid */
96 __le64 blocknr; /* which block this node is supposed to live in */
102 } __attribute__ ((__packed__));
104 #define BTRFS_MAX_LEVEL 8
105 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
106 sizeof(struct btrfs_header)) / \
107 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
108 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
109 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
110 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
111 sizeof(struct btrfs_item) - \
112 sizeof(struct btrfs_file_extent_item))
116 * the super block basically lists the main trees of the FS
117 * it currently lacks any block count etc etc
119 struct btrfs_super_block {
120 u8 csum[BTRFS_CSUM_SIZE];
121 /* the first 3 fields must match struct btrfs_header */
122 u8 fsid[16]; /* FS specific uuid */
123 __le64 blocknr; /* this block number */
129 __le64 root_dir_objectid;
131 } __attribute__ ((__packed__));
134 * A leaf is full of items. offset and size tell us where to find
135 * the item in the leaf (relative to the start of the data area)
138 struct btrfs_disk_key key;
141 } __attribute__ ((__packed__));
144 * leaves have an item area and a data area:
145 * [item0, item1....itemN] [free space] [dataN...data1, data0]
147 * The data is separate from the items to get the keys closer together
151 struct btrfs_header header;
152 struct btrfs_item items[];
153 } __attribute__ ((__packed__));
156 * all non-leaf blocks are nodes, they hold only keys and pointers to
159 struct btrfs_key_ptr {
160 struct btrfs_disk_key key;
162 } __attribute__ ((__packed__));
165 struct btrfs_header header;
166 struct btrfs_key_ptr ptrs[];
167 } __attribute__ ((__packed__));
170 * btrfs_paths remember the path taken from the root down to the leaf.
171 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
172 * to any other levels that are present.
174 * The slots array records the index of the item or block pointer
175 * used while walking the tree.
178 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
179 int slots[BTRFS_MAX_LEVEL];
185 * items in the extent btree are used to record the objectid of the
186 * owner of the block and the number of references
188 struct btrfs_extent_item {
191 } __attribute__ ((__packed__));
193 struct btrfs_inode_timespec {
196 } __attribute__ ((__packed__));
199 * there is no padding here on purpose. If you want to extent the inode,
200 * make a new item type
202 struct btrfs_inode_item {
214 struct btrfs_inode_timespec atime;
215 struct btrfs_inode_timespec ctime;
216 struct btrfs_inode_timespec mtime;
217 struct btrfs_inode_timespec otime;
218 } __attribute__ ((__packed__));
220 struct btrfs_dir_item {
221 struct btrfs_disk_key location;
225 } __attribute__ ((__packed__));
227 struct btrfs_root_item {
228 struct btrfs_inode_item inode;
235 struct btrfs_disk_key drop_progress;
237 } __attribute__ ((__packed__));
239 #define BTRFS_FILE_EXTENT_REG 0
240 #define BTRFS_FILE_EXTENT_INLINE 1
242 struct btrfs_file_extent_item {
246 * disk space consumed by the extent, checksum blocks are included
250 __le64 disk_num_blocks;
252 * the logical offset in file blocks (no csums)
253 * this extent record is for. This allows a file extent to point
254 * into the middle of an existing extent on disk, sharing it
255 * between two snapshots (useful if some bytes in the middle of the
256 * extent have changed
260 * the logical number of file blocks (no csums included)
263 } __attribute__ ((__packed__));
265 struct btrfs_csum_item {
267 } __attribute__ ((__packed__));
269 /* tag for the radix tree of block groups in ram */
270 #define BTRFS_BLOCK_GROUP_DIRTY 0
271 #define BTRFS_BLOCK_GROUP_AVAIL 1
272 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
275 #define BTRFS_BLOCK_GROUP_DATA 1
276 struct btrfs_block_group_item {
279 } __attribute__ ((__packed__));
281 struct btrfs_block_group_cache {
282 struct btrfs_key key;
283 struct btrfs_block_group_item item;
284 struct radix_tree_root *radix;
293 struct btrfs_fs_info {
294 struct btrfs_root *extent_root;
295 struct btrfs_root *tree_root;
296 struct radix_tree_root fs_roots_radix;
297 struct radix_tree_root pending_del_radix;
298 struct radix_tree_root pinned_radix;
299 struct radix_tree_root block_group_radix;
300 struct radix_tree_root block_group_data_radix;
301 struct radix_tree_root extent_map_radix;
303 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 6];
304 int extent_tree_insert_nr;
305 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 6];
306 int extent_tree_prealloc_nr;
309 struct btrfs_transaction *running_transaction;
310 struct btrfs_super_block *disk_super;
311 struct btrfs_super_block super_copy;
312 struct buffer_head *sb_buffer;
313 struct super_block *sb;
314 struct inode *btree_inode;
315 struct mutex trans_mutex;
316 struct mutex fs_mutex;
317 struct list_head trans_list;
318 struct list_head dead_roots;
319 struct delayed_work trans_work;
325 * in ram representation of the tree. extent_root is used for all allocations
326 * and for the extent tree extent_root root.
329 struct buffer_head *node;
330 struct buffer_head *commit_root;
331 struct btrfs_root_item root_item;
332 struct btrfs_key root_key;
333 struct btrfs_fs_info *fs_info;
340 u64 last_inode_alloc;
342 struct btrfs_key defrag_progress;
347 /* the lower bits in the key flags defines the item type */
348 #define BTRFS_KEY_TYPE_MAX 256
349 #define BTRFS_KEY_TYPE_SHIFT 24
350 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
351 BTRFS_KEY_TYPE_SHIFT)
354 * inode items have the data typically returned from stat and store other
355 * info about object characteristics. There is one for every file and dir in
358 #define BTRFS_INODE_ITEM_KEY 1
360 /* reserve 2-15 close to the inode for later flexibility */
363 * dir items are the name -> inode pointers in a directory. There is one
364 * for every name in a directory.
366 #define BTRFS_DIR_ITEM_KEY 16
367 #define BTRFS_DIR_INDEX_KEY 17
369 * extent data is for file data
371 #define BTRFS_EXTENT_DATA_KEY 18
373 * csum items have the checksums for data in the extents
375 #define BTRFS_CSUM_ITEM_KEY 19
377 /* reserve 20-31 for other file stuff */
380 * root items point to tree roots. There are typically in the root
381 * tree used by the super block to find all the other trees
383 #define BTRFS_ROOT_ITEM_KEY 32
385 * extent items are in the extent map tree. These record which blocks
386 * are used, and how many references there are to each block
388 #define BTRFS_EXTENT_ITEM_KEY 33
391 * block groups give us hints into the extent allocation trees. Which
392 * blocks are free etc etc
394 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
397 * string items are for debugging. They just store a short string of
400 #define BTRFS_STRING_ITEM_KEY 253
403 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
405 return le64_to_cpu(bi->used);
408 static inline void btrfs_set_block_group_used(struct
409 btrfs_block_group_item *bi,
412 bi->used = cpu_to_le64(val);
415 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
417 return le64_to_cpu(i->generation);
420 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
423 i->generation = cpu_to_le64(val);
426 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
428 return le64_to_cpu(i->size);
431 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
433 i->size = cpu_to_le64(val);
436 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
438 return le64_to_cpu(i->nblocks);
441 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
443 i->nblocks = cpu_to_le64(val);
446 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
448 return le64_to_cpu(i->block_group);
451 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
454 i->block_group = cpu_to_le64(val);
457 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
459 return le32_to_cpu(i->nlink);
462 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
464 i->nlink = cpu_to_le32(val);
467 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
469 return le32_to_cpu(i->uid);
472 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
474 i->uid = cpu_to_le32(val);
477 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
479 return le32_to_cpu(i->gid);
482 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
484 i->gid = cpu_to_le32(val);
487 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
489 return le32_to_cpu(i->mode);
492 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
494 i->mode = cpu_to_le32(val);
497 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
499 return le32_to_cpu(i->rdev);
502 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
504 i->rdev = cpu_to_le32(val);
507 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
509 return le16_to_cpu(i->flags);
512 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
514 i->flags = cpu_to_le16(val);
517 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
519 return le16_to_cpu(i->compat_flags);
522 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
525 i->compat_flags = cpu_to_le16(val);
528 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
530 return le64_to_cpu(ts->sec);
533 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
536 ts->sec = cpu_to_le64(val);
539 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
541 return le32_to_cpu(ts->nsec);
544 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
547 ts->nsec = cpu_to_le32(val);
550 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
552 return le32_to_cpu(ei->refs);
555 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
557 ei->refs = cpu_to_le32(val);
560 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
562 return le64_to_cpu(ei->owner);
565 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
567 ei->owner = cpu_to_le64(val);
570 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
572 return le64_to_cpu(n->ptrs[nr].blockptr);
576 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
579 n->ptrs[nr].blockptr = cpu_to_le64(val);
582 static inline u32 btrfs_item_offset(struct btrfs_item *item)
584 return le32_to_cpu(item->offset);
587 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
589 item->offset = cpu_to_le32(val);
592 static inline u32 btrfs_item_end(struct btrfs_item *item)
594 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
597 static inline u16 btrfs_item_size(struct btrfs_item *item)
599 return le16_to_cpu(item->size);
602 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
604 item->size = cpu_to_le16(val);
607 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
609 return le16_to_cpu(d->flags);
612 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
614 d->flags = cpu_to_le16(val);
617 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
622 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
627 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
629 return le16_to_cpu(d->name_len);
632 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
634 d->name_len = cpu_to_le16(val);
637 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
638 struct btrfs_disk_key *disk)
640 cpu->offset = le64_to_cpu(disk->offset);
641 cpu->flags = le32_to_cpu(disk->flags);
642 cpu->objectid = le64_to_cpu(disk->objectid);
645 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
646 struct btrfs_key *cpu)
648 disk->offset = cpu_to_le64(cpu->offset);
649 disk->flags = cpu_to_le32(cpu->flags);
650 disk->objectid = cpu_to_le64(cpu->objectid);
653 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
655 return le64_to_cpu(disk->objectid);
658 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
661 disk->objectid = cpu_to_le64(val);
664 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
666 return le64_to_cpu(disk->offset);
669 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
672 disk->offset = cpu_to_le64(val);
675 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
677 return le32_to_cpu(disk->flags);
680 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
683 disk->flags = cpu_to_le32(val);
686 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
688 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
691 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
694 u32 flags = btrfs_disk_key_flags(key);
695 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
696 val = val << BTRFS_KEY_TYPE_SHIFT;
697 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
698 btrfs_set_disk_key_flags(key, flags);
701 static inline u32 btrfs_key_type(struct btrfs_key *key)
703 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
706 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
708 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
709 val = val << BTRFS_KEY_TYPE_SHIFT;
710 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
713 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
715 return le64_to_cpu(h->blocknr);
718 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
720 h->blocknr = cpu_to_le64(blocknr);
723 static inline u64 btrfs_header_generation(struct btrfs_header *h)
725 return le64_to_cpu(h->generation);
728 static inline void btrfs_set_header_generation(struct btrfs_header *h,
731 h->generation = cpu_to_le64(val);
734 static inline u64 btrfs_header_owner(struct btrfs_header *h)
736 return le64_to_cpu(h->owner);
739 static inline void btrfs_set_header_owner(struct btrfs_header *h,
742 h->owner = cpu_to_le64(val);
745 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
747 return le16_to_cpu(h->nritems);
750 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
752 h->nritems = cpu_to_le16(val);
755 static inline u16 btrfs_header_flags(struct btrfs_header *h)
757 return le16_to_cpu(h->flags);
760 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
762 h->flags = cpu_to_le16(val);
765 static inline int btrfs_header_level(struct btrfs_header *h)
770 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
772 BUG_ON(level > BTRFS_MAX_LEVEL);
776 static inline int btrfs_is_leaf(struct btrfs_node *n)
778 return (btrfs_header_level(&n->header) == 0);
781 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
783 return le64_to_cpu(item->blocknr);
786 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
788 item->blocknr = cpu_to_le64(val);
791 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
793 return le64_to_cpu(item->root_dirid);
796 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
798 item->root_dirid = cpu_to_le64(val);
801 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
803 return le32_to_cpu(item->refs);
806 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
808 item->refs = cpu_to_le32(val);
811 static inline u32 btrfs_root_flags(struct btrfs_root_item *item)
813 return le32_to_cpu(item->flags);
816 static inline void btrfs_set_root_flags(struct btrfs_root_item *item, u32 val)
818 item->flags = cpu_to_le32(val);
821 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
823 return le64_to_cpu(s->blocknr);
826 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
828 s->blocknr = cpu_to_le64(val);
831 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
833 return le64_to_cpu(s->generation);
836 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
839 s->generation = cpu_to_le64(val);
842 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
844 return le64_to_cpu(s->root);
847 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
849 s->root = cpu_to_le64(val);
852 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
854 return le64_to_cpu(s->total_blocks);
857 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
860 s->total_blocks = cpu_to_le64(val);
863 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
865 return le64_to_cpu(s->blocks_used);
868 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
871 s->blocks_used = cpu_to_le64(val);
874 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
876 return le32_to_cpu(s->blocksize);
879 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
882 s->blocksize = cpu_to_le32(val);
885 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
887 return le64_to_cpu(s->root_dir_objectid);
890 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
893 s->root_dir_objectid = cpu_to_le64(val);
896 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
898 return (u8 *)l->items;
901 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
905 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
911 static inline char *btrfs_file_extent_inline_start(struct
912 btrfs_file_extent_item *e)
914 return (char *)(&e->disk_blocknr);
917 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
919 return (unsigned long)(&((struct
920 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
923 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
925 struct btrfs_file_extent_item *fe = NULL;
926 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
929 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
932 return le64_to_cpu(e->disk_blocknr);
935 static inline void btrfs_set_file_extent_disk_blocknr(struct
936 btrfs_file_extent_item
939 e->disk_blocknr = cpu_to_le64(val);
942 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
944 return le64_to_cpu(e->generation);
947 static inline void btrfs_set_file_extent_generation(struct
948 btrfs_file_extent_item *e,
951 e->generation = cpu_to_le64(val);
954 static inline u64 btrfs_file_extent_disk_num_blocks(struct
955 btrfs_file_extent_item *e)
957 return le64_to_cpu(e->disk_num_blocks);
960 static inline void btrfs_set_file_extent_disk_num_blocks(struct
961 btrfs_file_extent_item
964 e->disk_num_blocks = cpu_to_le64(val);
967 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
969 return le64_to_cpu(e->offset);
972 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
975 e->offset = cpu_to_le64(val);
978 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
981 return le64_to_cpu(e->num_blocks);
984 static inline void btrfs_set_file_extent_num_blocks(struct
985 btrfs_file_extent_item *e,
988 e->num_blocks = cpu_to_le64(val);
991 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
993 return sb->s_fs_info;
996 static inline void btrfs_check_bounds(void *vptr, size_t len,
997 void *vcontainer, size_t container_len)
1000 char *container = vcontainer;
1001 WARN_ON(ptr < container);
1002 WARN_ON(ptr + len > container + container_len);
1005 static inline void btrfs_memcpy(struct btrfs_root *root,
1007 void *dst, const void *src, size_t nr)
1009 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1010 memcpy(dst, src, nr);
1013 static inline void btrfs_memmove(struct btrfs_root *root,
1015 void *dst, void *src, size_t nr)
1017 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1018 memmove(dst, src, nr);
1021 /* helper function to cast into the data area of the leaf. */
1022 #define btrfs_item_ptr(leaf, slot, type) \
1023 ((type *)(btrfs_leaf_data(leaf) + \
1024 btrfs_item_offset((leaf)->items + (slot))))
1027 int btrfs_copy_pinned(struct btrfs_root *root, struct radix_tree_root *copy);
1028 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1029 btrfs_fs_info *info,
1031 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1032 struct btrfs_block_group_cache
1033 *hint, u64 search_start,
1034 int data, int owner);
1035 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1036 struct btrfs_root *root);
1037 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1038 struct btrfs_root *root, u64 hint,
1040 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1041 struct btrfs_root *root, u64 owner,
1042 u64 num_blocks, u64 empty_size, u64 search_start,
1043 u64 search_end, struct btrfs_key *ins, int data);
1044 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1045 struct buffer_head *buf);
1046 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1047 *root, u64 blocknr, u64 num_blocks, int pin);
1048 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1049 struct btrfs_root *root,
1050 struct radix_tree_root *unpin_radix);
1051 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1052 struct btrfs_root *root,
1053 u64 blocknr, u64 num_blocks);
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);
1059 int btrfs_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root
1060 *root, struct buffer_head *buf, struct buffer_head
1061 *parent, int parent_slot, struct buffer_head
1063 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1064 *root, struct btrfs_path *path, u32 data_size);
1065 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1066 struct btrfs_root *root,
1067 struct btrfs_path *path,
1069 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1070 *root, struct btrfs_key *key, struct btrfs_path *p, int
1072 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1073 struct btrfs_root *root, struct buffer_head *parent,
1075 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1076 struct btrfs_path *btrfs_alloc_path(void);
1077 void btrfs_free_path(struct btrfs_path *p);
1078 void btrfs_init_path(struct btrfs_path *p);
1079 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1080 struct btrfs_path *path);
1081 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1082 *root, struct btrfs_key *key, void *data, u32 data_size);
1083 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1084 *root, struct btrfs_path *path, struct btrfs_key
1085 *cpu_key, u32 data_size);
1086 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1087 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1088 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1091 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1092 struct btrfs_key *key);
1093 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1094 *root, struct btrfs_key *key, struct btrfs_root_item
1096 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1097 *root, struct btrfs_key *key, struct btrfs_root_item
1099 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1100 btrfs_root_item *item, struct btrfs_key *key);
1101 int btrfs_find_dead_roots(struct btrfs_root *root);
1103 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1104 *root, const char *name, int name_len, u64 dir,
1105 struct btrfs_key *location, u8 type);
1106 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1107 struct btrfs_root *root,
1108 struct btrfs_path *path, u64 dir,
1109 const char *name, int name_len,
1111 struct btrfs_dir_item *
1112 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1113 struct btrfs_root *root,
1114 struct btrfs_path *path, u64 dir,
1115 u64 objectid, const char *name, int name_len,
1117 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1118 struct btrfs_path *path,
1119 const char *name, int name_len);
1120 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1121 struct btrfs_root *root,
1122 struct btrfs_path *path,
1123 struct btrfs_dir_item *di);
1125 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1126 struct btrfs_root *fs_root,
1127 u64 dirid, u64 *objectid);
1128 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1131 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1132 *root, u64 objectid, struct btrfs_inode_item
1134 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1135 *root, struct btrfs_path *path,
1136 struct btrfs_key *location, int mod);
1139 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1140 struct btrfs_root *root,
1141 u64 objectid, u64 pos, u64 offset,
1142 u64 disk_num_blocks,
1144 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1145 struct btrfs_root *root,
1146 struct btrfs_path *path, u64 objectid,
1147 u64 blocknr, int mod);
1148 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1149 struct btrfs_root *root,
1150 u64 objectid, u64 offset,
1151 char *data, size_t len);
1152 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1153 struct btrfs_root *root,
1154 struct btrfs_path *path,
1155 u64 objectid, u64 offset,
1157 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1158 struct btrfs_root *root, struct btrfs_path *path,
1161 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1162 int btrfs_readpage(struct file *file, struct page *page);
1163 void btrfs_delete_inode(struct inode *inode);
1164 void btrfs_read_locked_inode(struct inode *inode);
1165 int btrfs_write_inode(struct inode *inode, int wait);
1166 void btrfs_dirty_inode(struct inode *inode);
1167 struct inode *btrfs_alloc_inode(struct super_block *sb);
1168 void btrfs_destroy_inode(struct inode *inode);
1169 int btrfs_init_cachep(void);
1170 void btrfs_destroy_cachep(void);
1171 int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
1173 long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
1175 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1176 struct btrfs_root *root);
1177 int btrfs_commit_write(struct file *file, struct page *page,
1178 unsigned from, unsigned to);
1179 int btrfs_get_block(struct inode *inode, sector_t iblock,
1180 struct buffer_head *result, int create);
1182 extern struct file_operations btrfs_file_operations;
1183 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1184 struct btrfs_root *root, struct inode *inode,
1185 u64 start, u64 end, u64 *hint_block);
1187 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1188 struct btrfs_root *root, int cache_only);