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 <linux/completion.h>
26 #include "bit-radix.h"
28 struct btrfs_trans_handle
;
29 struct btrfs_transaction
;
30 extern struct kmem_cache
*btrfs_trans_handle_cachep
;
31 extern struct kmem_cache
*btrfs_transaction_cachep
;
32 extern struct kmem_cache
*btrfs_bit_radix_cachep
;
33 extern struct kmem_cache
*btrfs_path_cachep
;
35 #define BTRFS_MAGIC "_BtRfS_M"
37 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
38 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
39 #define BTRFS_FS_TREE_OBJECTID 3ULL
40 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
41 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
44 * we can actually store much bigger names, but lets not confuse the rest
47 #define BTRFS_NAME_LEN 255
49 /* 32 bytes in various csum fields */
50 #define BTRFS_CSUM_SIZE 32
51 /* four bytes for CRC32 */
52 #define BTRFS_CRC32_SIZE 4
53 #define BTRFS_EMPTY_DIR_SIZE 6
55 #define BTRFS_FT_UNKNOWN 0
56 #define BTRFS_FT_REG_FILE 1
57 #define BTRFS_FT_DIR 2
58 #define BTRFS_FT_CHRDEV 3
59 #define BTRFS_FT_BLKDEV 4
60 #define BTRFS_FT_FIFO 5
61 #define BTRFS_FT_SOCK 6
62 #define BTRFS_FT_SYMLINK 7
63 #define BTRFS_FT_MAX 8
66 * the key defines the order in the tree, and so it also defines (optimal)
67 * block layout. objectid corresonds to the inode number. The flags
68 * tells us things about the object, and is a kind of stream selector.
69 * so for a given inode, keys with flags of 1 might refer to the inode
70 * data, flags of 2 may point to file data in the btree and flags == 3
71 * may point to extents.
73 * offset is the starting byte offset for this key in the stream.
75 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
76 * in cpu native order. Otherwise they are identical and their sizes
77 * should be the same (ie both packed)
79 struct btrfs_disk_key
{
83 } __attribute__ ((__packed__
));
89 } __attribute__ ((__packed__
));
92 * every tree block (leaf or node) starts with this header.
95 u8 csum
[BTRFS_CSUM_SIZE
];
96 u8 fsid
[16]; /* FS specific uuid */
97 __le64 blocknr
; /* which block this node is supposed to live in */
103 } __attribute__ ((__packed__
));
105 #define BTRFS_MAX_LEVEL 8
106 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
107 sizeof(struct btrfs_header)) / \
108 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
109 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
110 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
111 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
112 sizeof(struct btrfs_item) - \
113 sizeof(struct btrfs_file_extent_item))
117 * the super block basically lists the main trees of the FS
118 * it currently lacks any block count etc etc
120 struct btrfs_super_block
{
121 u8 csum
[BTRFS_CSUM_SIZE
];
122 /* the first 3 fields must match struct btrfs_header */
123 u8 fsid
[16]; /* FS specific uuid */
124 __le64 blocknr
; /* this block number */
130 __le64 root_dir_objectid
;
132 } __attribute__ ((__packed__
));
135 * A leaf is full of items. offset and size tell us where to find
136 * the item in the leaf (relative to the start of the data area)
139 struct btrfs_disk_key key
;
142 } __attribute__ ((__packed__
));
145 * leaves have an item area and a data area:
146 * [item0, item1....itemN] [free space] [dataN...data1, data0]
148 * The data is separate from the items to get the keys closer together
152 struct btrfs_header header
;
153 struct btrfs_item items
[];
154 } __attribute__ ((__packed__
));
157 * all non-leaf blocks are nodes, they hold only keys and pointers to
160 struct btrfs_key_ptr
{
161 struct btrfs_disk_key key
;
163 } __attribute__ ((__packed__
));
166 struct btrfs_header header
;
167 struct btrfs_key_ptr ptrs
[];
168 } __attribute__ ((__packed__
));
171 * btrfs_paths remember the path taken from the root down to the leaf.
172 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
173 * to any other levels that are present.
175 * The slots array records the index of the item or block pointer
176 * used while walking the tree.
179 struct buffer_head
*nodes
[BTRFS_MAX_LEVEL
];
180 int slots
[BTRFS_MAX_LEVEL
];
186 * items in the extent btree are used to record the objectid of the
187 * owner of the block and the number of references
189 struct btrfs_extent_item
{
192 } __attribute__ ((__packed__
));
194 struct btrfs_inode_timespec
{
197 } __attribute__ ((__packed__
));
200 * there is no padding here on purpose. If you want to extent the inode,
201 * make a new item type
203 struct btrfs_inode_item
{
215 struct btrfs_inode_timespec atime
;
216 struct btrfs_inode_timespec ctime
;
217 struct btrfs_inode_timespec mtime
;
218 struct btrfs_inode_timespec otime
;
219 } __attribute__ ((__packed__
));
221 struct btrfs_dir_item
{
222 struct btrfs_disk_key location
;
226 } __attribute__ ((__packed__
));
228 struct btrfs_root_item
{
229 struct btrfs_inode_item inode
;
236 struct btrfs_disk_key drop_progress
;
238 } __attribute__ ((__packed__
));
240 #define BTRFS_FILE_EXTENT_REG 0
241 #define BTRFS_FILE_EXTENT_INLINE 1
243 struct btrfs_file_extent_item
{
247 * disk space consumed by the extent, checksum blocks are included
251 __le64 disk_num_blocks
;
253 * the logical offset in file blocks (no csums)
254 * this extent record is for. This allows a file extent to point
255 * into the middle of an existing extent on disk, sharing it
256 * between two snapshots (useful if some bytes in the middle of the
257 * extent have changed
261 * the logical number of file blocks (no csums included)
264 } __attribute__ ((__packed__
));
266 struct btrfs_csum_item
{
268 } __attribute__ ((__packed__
));
270 /* tag for the radix tree of block groups in ram */
271 #define BTRFS_BLOCK_GROUP_DIRTY 0
272 #define BTRFS_BLOCK_GROUP_AVAIL 1
273 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
276 #define BTRFS_BLOCK_GROUP_DATA 1
277 struct btrfs_block_group_item
{
280 } __attribute__ ((__packed__
));
282 struct btrfs_block_group_cache
{
283 struct btrfs_key key
;
284 struct btrfs_block_group_item item
;
285 struct radix_tree_root
*radix
;
294 struct btrfs_fs_info
{
295 struct btrfs_root
*extent_root
;
296 struct btrfs_root
*tree_root
;
297 struct radix_tree_root fs_roots_radix
;
298 struct radix_tree_root pending_del_radix
;
299 struct radix_tree_root pinned_radix
;
300 struct radix_tree_root block_group_radix
;
301 struct radix_tree_root block_group_data_radix
;
302 struct radix_tree_root extent_map_radix
;
303 struct radix_tree_root extent_ins_radix
;
305 u64 last_trans_committed
;
306 struct btrfs_transaction
*running_transaction
;
307 struct btrfs_super_block
*disk_super
;
308 struct btrfs_super_block super_copy
;
309 struct buffer_head
*sb_buffer
;
310 struct super_block
*sb
;
311 struct inode
*btree_inode
;
312 struct mutex trans_mutex
;
313 struct mutex fs_mutex
;
314 struct list_head trans_list
;
315 struct list_head dead_roots
;
316 struct delayed_work trans_work
;
317 struct kobject super_kobj
;
318 struct completion kobj_unregister
;
324 * in ram representation of the tree. extent_root is used for all allocations
325 * and for the extent tree extent_root root.
328 struct buffer_head
*node
;
329 struct buffer_head
*commit_root
;
330 struct btrfs_root_item root_item
;
331 struct btrfs_key root_key
;
332 struct btrfs_fs_info
*fs_info
;
334 struct kobject root_kobj
;
335 struct completion kobj_unregister
;
336 struct rw_semaphore snap_sem
;
342 u64 last_inode_alloc
;
344 struct btrfs_key defrag_progress
;
350 /* the lower bits in the key flags defines the item type */
351 #define BTRFS_KEY_TYPE_MAX 256
352 #define BTRFS_KEY_TYPE_SHIFT 24
353 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
354 BTRFS_KEY_TYPE_SHIFT)
357 * inode items have the data typically returned from stat and store other
358 * info about object characteristics. There is one for every file and dir in
361 #define BTRFS_INODE_ITEM_KEY 1
363 /* reserve 2-15 close to the inode for later flexibility */
366 * dir items are the name -> inode pointers in a directory. There is one
367 * for every name in a directory.
369 #define BTRFS_DIR_ITEM_KEY 16
370 #define BTRFS_DIR_INDEX_KEY 17
372 * extent data is for file data
374 #define BTRFS_EXTENT_DATA_KEY 18
376 * csum items have the checksums for data in the extents
378 #define BTRFS_CSUM_ITEM_KEY 19
380 /* reserve 20-31 for other file stuff */
383 * root items point to tree roots. There are typically in the root
384 * tree used by the super block to find all the other trees
386 #define BTRFS_ROOT_ITEM_KEY 32
388 * extent items are in the extent map tree. These record which blocks
389 * are used, and how many references there are to each block
391 #define BTRFS_EXTENT_ITEM_KEY 33
394 * block groups give us hints into the extent allocation trees. Which
395 * blocks are free etc etc
397 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
400 * string items are for debugging. They just store a short string of
403 #define BTRFS_STRING_ITEM_KEY 253
406 static inline u64
btrfs_block_group_used(struct btrfs_block_group_item
*bi
)
408 return le64_to_cpu(bi
->used
);
411 static inline void btrfs_set_block_group_used(struct
412 btrfs_block_group_item
*bi
,
415 bi
->used
= cpu_to_le64(val
);
418 static inline u64
btrfs_inode_generation(struct btrfs_inode_item
*i
)
420 return le64_to_cpu(i
->generation
);
423 static inline void btrfs_set_inode_generation(struct btrfs_inode_item
*i
,
426 i
->generation
= cpu_to_le64(val
);
429 static inline u64
btrfs_inode_size(struct btrfs_inode_item
*i
)
431 return le64_to_cpu(i
->size
);
434 static inline void btrfs_set_inode_size(struct btrfs_inode_item
*i
, u64 val
)
436 i
->size
= cpu_to_le64(val
);
439 static inline u64
btrfs_inode_nblocks(struct btrfs_inode_item
*i
)
441 return le64_to_cpu(i
->nblocks
);
444 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item
*i
, u64 val
)
446 i
->nblocks
= cpu_to_le64(val
);
449 static inline u64
btrfs_inode_block_group(struct btrfs_inode_item
*i
)
451 return le64_to_cpu(i
->block_group
);
454 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item
*i
,
457 i
->block_group
= cpu_to_le64(val
);
460 static inline u32
btrfs_inode_nlink(struct btrfs_inode_item
*i
)
462 return le32_to_cpu(i
->nlink
);
465 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item
*i
, u32 val
)
467 i
->nlink
= cpu_to_le32(val
);
470 static inline u32
btrfs_inode_uid(struct btrfs_inode_item
*i
)
472 return le32_to_cpu(i
->uid
);
475 static inline void btrfs_set_inode_uid(struct btrfs_inode_item
*i
, u32 val
)
477 i
->uid
= cpu_to_le32(val
);
480 static inline u32
btrfs_inode_gid(struct btrfs_inode_item
*i
)
482 return le32_to_cpu(i
->gid
);
485 static inline void btrfs_set_inode_gid(struct btrfs_inode_item
*i
, u32 val
)
487 i
->gid
= cpu_to_le32(val
);
490 static inline u32
btrfs_inode_mode(struct btrfs_inode_item
*i
)
492 return le32_to_cpu(i
->mode
);
495 static inline void btrfs_set_inode_mode(struct btrfs_inode_item
*i
, u32 val
)
497 i
->mode
= cpu_to_le32(val
);
500 static inline u32
btrfs_inode_rdev(struct btrfs_inode_item
*i
)
502 return le32_to_cpu(i
->rdev
);
505 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item
*i
, u32 val
)
507 i
->rdev
= cpu_to_le32(val
);
510 static inline u16
btrfs_inode_flags(struct btrfs_inode_item
*i
)
512 return le16_to_cpu(i
->flags
);
515 static inline void btrfs_set_inode_flags(struct btrfs_inode_item
*i
, u16 val
)
517 i
->flags
= cpu_to_le16(val
);
520 static inline u16
btrfs_inode_compat_flags(struct btrfs_inode_item
*i
)
522 return le16_to_cpu(i
->compat_flags
);
525 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item
*i
,
528 i
->compat_flags
= cpu_to_le16(val
);
531 static inline u64
btrfs_timespec_sec(struct btrfs_inode_timespec
*ts
)
533 return le64_to_cpu(ts
->sec
);
536 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec
*ts
,
539 ts
->sec
= cpu_to_le64(val
);
542 static inline u32
btrfs_timespec_nsec(struct btrfs_inode_timespec
*ts
)
544 return le32_to_cpu(ts
->nsec
);
547 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec
*ts
,
550 ts
->nsec
= cpu_to_le32(val
);
553 static inline u32
btrfs_extent_refs(struct btrfs_extent_item
*ei
)
555 return le32_to_cpu(ei
->refs
);
558 static inline void btrfs_set_extent_refs(struct btrfs_extent_item
*ei
, u32 val
)
560 ei
->refs
= cpu_to_le32(val
);
563 static inline u64
btrfs_extent_owner(struct btrfs_extent_item
*ei
)
565 return le64_to_cpu(ei
->owner
);
568 static inline void btrfs_set_extent_owner(struct btrfs_extent_item
*ei
, u64 val
)
570 ei
->owner
= cpu_to_le64(val
);
573 static inline u64
btrfs_node_blockptr(struct btrfs_node
*n
, int nr
)
575 return le64_to_cpu(n
->ptrs
[nr
].blockptr
);
579 static inline void btrfs_set_node_blockptr(struct btrfs_node
*n
, int nr
,
582 n
->ptrs
[nr
].blockptr
= cpu_to_le64(val
);
585 static inline u32
btrfs_item_offset(struct btrfs_item
*item
)
587 return le32_to_cpu(item
->offset
);
590 static inline void btrfs_set_item_offset(struct btrfs_item
*item
, u32 val
)
592 item
->offset
= cpu_to_le32(val
);
595 static inline u32
btrfs_item_end(struct btrfs_item
*item
)
597 return le32_to_cpu(item
->offset
) + le16_to_cpu(item
->size
);
600 static inline u16
btrfs_item_size(struct btrfs_item
*item
)
602 return le16_to_cpu(item
->size
);
605 static inline void btrfs_set_item_size(struct btrfs_item
*item
, u16 val
)
607 item
->size
= cpu_to_le16(val
);
610 static inline u16
btrfs_dir_flags(struct btrfs_dir_item
*d
)
612 return le16_to_cpu(d
->flags
);
615 static inline void btrfs_set_dir_flags(struct btrfs_dir_item
*d
, u16 val
)
617 d
->flags
= cpu_to_le16(val
);
620 static inline u8
btrfs_dir_type(struct btrfs_dir_item
*d
)
625 static inline void btrfs_set_dir_type(struct btrfs_dir_item
*d
, u8 val
)
630 static inline u16
btrfs_dir_name_len(struct btrfs_dir_item
*d
)
632 return le16_to_cpu(d
->name_len
);
635 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item
*d
, u16 val
)
637 d
->name_len
= cpu_to_le16(val
);
640 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
641 struct btrfs_disk_key
*disk
)
643 cpu
->offset
= le64_to_cpu(disk
->offset
);
644 cpu
->flags
= le32_to_cpu(disk
->flags
);
645 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
648 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
649 struct btrfs_key
*cpu
)
651 disk
->offset
= cpu_to_le64(cpu
->offset
);
652 disk
->flags
= cpu_to_le32(cpu
->flags
);
653 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
656 static inline u64
btrfs_disk_key_objectid(struct btrfs_disk_key
*disk
)
658 return le64_to_cpu(disk
->objectid
);
661 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key
*disk
,
664 disk
->objectid
= cpu_to_le64(val
);
667 static inline u64
btrfs_disk_key_offset(struct btrfs_disk_key
*disk
)
669 return le64_to_cpu(disk
->offset
);
672 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key
*disk
,
675 disk
->offset
= cpu_to_le64(val
);
678 static inline u32
btrfs_disk_key_flags(struct btrfs_disk_key
*disk
)
680 return le32_to_cpu(disk
->flags
);
683 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key
*disk
,
686 disk
->flags
= cpu_to_le32(val
);
689 static inline u32
btrfs_disk_key_type(struct btrfs_disk_key
*key
)
691 return le32_to_cpu(key
->flags
) >> BTRFS_KEY_TYPE_SHIFT
;
694 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key
*key
,
697 u32 flags
= btrfs_disk_key_flags(key
);
698 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
699 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
700 flags
= (flags
& ~BTRFS_KEY_TYPE_MASK
) | val
;
701 btrfs_set_disk_key_flags(key
, flags
);
704 static inline u32
btrfs_key_type(struct btrfs_key
*key
)
706 return key
->flags
>> BTRFS_KEY_TYPE_SHIFT
;
709 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u32 val
)
711 BUG_ON(val
>= BTRFS_KEY_TYPE_MAX
);
712 val
= val
<< BTRFS_KEY_TYPE_SHIFT
;
713 key
->flags
= (key
->flags
& ~(BTRFS_KEY_TYPE_MASK
)) | val
;
716 static inline u64
btrfs_header_blocknr(struct btrfs_header
*h
)
718 return le64_to_cpu(h
->blocknr
);
721 static inline void btrfs_set_header_blocknr(struct btrfs_header
*h
, u64 blocknr
)
723 h
->blocknr
= cpu_to_le64(blocknr
);
726 static inline u64
btrfs_header_generation(struct btrfs_header
*h
)
728 return le64_to_cpu(h
->generation
);
731 static inline void btrfs_set_header_generation(struct btrfs_header
*h
,
734 h
->generation
= cpu_to_le64(val
);
737 static inline u64
btrfs_header_owner(struct btrfs_header
*h
)
739 return le64_to_cpu(h
->owner
);
742 static inline void btrfs_set_header_owner(struct btrfs_header
*h
,
745 h
->owner
= cpu_to_le64(val
);
748 static inline u16
btrfs_header_nritems(struct btrfs_header
*h
)
750 return le16_to_cpu(h
->nritems
);
753 static inline void btrfs_set_header_nritems(struct btrfs_header
*h
, u16 val
)
755 h
->nritems
= cpu_to_le16(val
);
758 static inline u16
btrfs_header_flags(struct btrfs_header
*h
)
760 return le16_to_cpu(h
->flags
);
763 static inline void btrfs_set_header_flags(struct btrfs_header
*h
, u16 val
)
765 h
->flags
= cpu_to_le16(val
);
768 static inline int btrfs_header_level(struct btrfs_header
*h
)
773 static inline void btrfs_set_header_level(struct btrfs_header
*h
, int level
)
775 BUG_ON(level
> BTRFS_MAX_LEVEL
);
779 static inline int btrfs_is_leaf(struct btrfs_node
*n
)
781 return (btrfs_header_level(&n
->header
) == 0);
784 static inline u64
btrfs_root_blocknr(struct btrfs_root_item
*item
)
786 return le64_to_cpu(item
->blocknr
);
789 static inline void btrfs_set_root_blocknr(struct btrfs_root_item
*item
, u64 val
)
791 item
->blocknr
= cpu_to_le64(val
);
794 static inline u64
btrfs_root_dirid(struct btrfs_root_item
*item
)
796 return le64_to_cpu(item
->root_dirid
);
799 static inline void btrfs_set_root_dirid(struct btrfs_root_item
*item
, u64 val
)
801 item
->root_dirid
= cpu_to_le64(val
);
804 static inline u32
btrfs_root_refs(struct btrfs_root_item
*item
)
806 return le32_to_cpu(item
->refs
);
809 static inline void btrfs_set_root_refs(struct btrfs_root_item
*item
, u32 val
)
811 item
->refs
= cpu_to_le32(val
);
814 static inline u32
btrfs_root_flags(struct btrfs_root_item
*item
)
816 return le32_to_cpu(item
->flags
);
819 static inline void btrfs_set_root_flags(struct btrfs_root_item
*item
, u32 val
)
821 item
->flags
= cpu_to_le32(val
);
824 static inline void btrfs_set_root_blocks_used(struct btrfs_root_item
*item
,
827 item
->blocks_used
= cpu_to_le64(val
);
830 static inline u64
btrfs_root_blocks_used(struct btrfs_root_item
*item
)
832 return le64_to_cpu(item
->blocks_used
);
835 static inline void btrfs_set_root_block_limit(struct btrfs_root_item
*item
,
838 item
->block_limit
= cpu_to_le64(val
);
841 static inline u64
btrfs_root_block_limit(struct btrfs_root_item
*item
)
843 return le64_to_cpu(item
->block_limit
);
846 static inline u64
btrfs_super_blocknr(struct btrfs_super_block
*s
)
848 return le64_to_cpu(s
->blocknr
);
851 static inline void btrfs_set_super_blocknr(struct btrfs_super_block
*s
, u64 val
)
853 s
->blocknr
= cpu_to_le64(val
);
856 static inline u64
btrfs_super_generation(struct btrfs_super_block
*s
)
858 return le64_to_cpu(s
->generation
);
861 static inline void btrfs_set_super_generation(struct btrfs_super_block
*s
,
864 s
->generation
= cpu_to_le64(val
);
867 static inline u64
btrfs_super_root(struct btrfs_super_block
*s
)
869 return le64_to_cpu(s
->root
);
872 static inline void btrfs_set_super_root(struct btrfs_super_block
*s
, u64 val
)
874 s
->root
= cpu_to_le64(val
);
877 static inline u64
btrfs_super_total_blocks(struct btrfs_super_block
*s
)
879 return le64_to_cpu(s
->total_blocks
);
882 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block
*s
,
885 s
->total_blocks
= cpu_to_le64(val
);
888 static inline u64
btrfs_super_blocks_used(struct btrfs_super_block
*s
)
890 return le64_to_cpu(s
->blocks_used
);
893 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block
*s
,
896 s
->blocks_used
= cpu_to_le64(val
);
899 static inline u32
btrfs_super_blocksize(struct btrfs_super_block
*s
)
901 return le32_to_cpu(s
->blocksize
);
904 static inline void btrfs_set_super_blocksize(struct btrfs_super_block
*s
,
907 s
->blocksize
= cpu_to_le32(val
);
910 static inline u64
btrfs_super_root_dir(struct btrfs_super_block
*s
)
912 return le64_to_cpu(s
->root_dir_objectid
);
915 static inline void btrfs_set_super_root_dir(struct btrfs_super_block
*s
, u64
918 s
->root_dir_objectid
= cpu_to_le64(val
);
921 static inline u8
*btrfs_leaf_data(struct btrfs_leaf
*l
)
923 return (u8
*)l
->items
;
926 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item
*e
)
930 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item
*e
,
936 static inline char *btrfs_file_extent_inline_start(struct
937 btrfs_file_extent_item
*e
)
939 return (char *)(&e
->disk_blocknr
);
942 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
944 return (unsigned long)(&((struct
945 btrfs_file_extent_item
*)NULL
)->disk_blocknr
) + datasize
;
948 static inline u32
btrfs_file_extent_inline_len(struct btrfs_item
*e
)
950 struct btrfs_file_extent_item
*fe
= NULL
;
951 return btrfs_item_size(e
) - (unsigned long)(&fe
->disk_blocknr
);
954 static inline u64
btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
957 return le64_to_cpu(e
->disk_blocknr
);
960 static inline void btrfs_set_file_extent_disk_blocknr(struct
961 btrfs_file_extent_item
964 e
->disk_blocknr
= cpu_to_le64(val
);
967 static inline u64
btrfs_file_extent_generation(struct btrfs_file_extent_item
*e
)
969 return le64_to_cpu(e
->generation
);
972 static inline void btrfs_set_file_extent_generation(struct
973 btrfs_file_extent_item
*e
,
976 e
->generation
= cpu_to_le64(val
);
979 static inline u64
btrfs_file_extent_disk_num_blocks(struct
980 btrfs_file_extent_item
*e
)
982 return le64_to_cpu(e
->disk_num_blocks
);
985 static inline void btrfs_set_file_extent_disk_num_blocks(struct
986 btrfs_file_extent_item
989 e
->disk_num_blocks
= cpu_to_le64(val
);
992 static inline u64
btrfs_file_extent_offset(struct btrfs_file_extent_item
*e
)
994 return le64_to_cpu(e
->offset
);
997 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
1000 e
->offset
= cpu_to_le64(val
);
1003 static inline u64
btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
1006 return le64_to_cpu(e
->num_blocks
);
1009 static inline void btrfs_set_file_extent_num_blocks(struct
1010 btrfs_file_extent_item
*e
,
1013 e
->num_blocks
= cpu_to_le64(val
);
1016 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
1018 return sb
->s_fs_info
;
1021 static inline void btrfs_check_bounds(void *vptr
, size_t len
,
1022 void *vcontainer
, size_t container_len
)
1025 char *container
= vcontainer
;
1026 WARN_ON(ptr
< container
);
1027 WARN_ON(ptr
+ len
> container
+ container_len
);
1030 static inline void btrfs_memcpy(struct btrfs_root
*root
,
1032 void *dst
, const void *src
, size_t nr
)
1034 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
1035 memcpy(dst
, src
, nr
);
1038 static inline void btrfs_memmove(struct btrfs_root
*root
,
1040 void *dst
, void *src
, size_t nr
)
1042 btrfs_check_bounds(dst
, nr
, dst_block
, root
->fs_info
->sb
->s_blocksize
);
1043 memmove(dst
, src
, nr
);
1046 static inline int btrfs_set_root_name(struct btrfs_root
*root
,
1047 const char *name
, int len
)
1049 /* if we already have a name just free it */
1053 root
->name
= kmalloc(len
+1, GFP_KERNEL
);
1057 memcpy(root
->name
, name
, len
);
1058 root
->name
[len
] ='\0';
1063 /* helper function to cast into the data area of the leaf. */
1064 #define btrfs_item_ptr(leaf, slot, type) \
1065 ((type *)(btrfs_leaf_data(leaf) + \
1066 btrfs_item_offset((leaf)->items + (slot))))
1068 /* mount option defines and helpers */
1069 #define BTRFS_MOUNT_SUBVOL 0x000001
1070 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
1071 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
1072 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
1075 int btrfs_extent_post_op(struct btrfs_trans_handle
*trans
,
1076 struct btrfs_root
*root
);
1077 int btrfs_copy_pinned(struct btrfs_root
*root
, struct radix_tree_root
*copy
);
1078 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
1079 btrfs_fs_info
*info
,
1081 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
1082 struct btrfs_block_group_cache
1083 *hint
, u64 search_start
,
1084 int data
, int owner
);
1085 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
1086 struct btrfs_root
*root
);
1087 struct buffer_head
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
1088 struct btrfs_root
*root
, u64 hint
,
1090 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
1091 struct btrfs_root
*root
, u64 owner
,
1092 u64 num_blocks
, u64 empty_size
, u64 search_start
,
1093 u64 search_end
, struct btrfs_key
*ins
, int data
);
1094 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1095 struct buffer_head
*buf
);
1096 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
1097 *root
, u64 blocknr
, u64 num_blocks
, int pin
);
1098 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
1099 struct btrfs_root
*root
,
1100 struct radix_tree_root
*unpin_radix
);
1101 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1102 struct btrfs_root
*root
,
1103 u64 blocknr
, u64 num_blocks
);
1104 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
1105 struct btrfs_root
*root
);
1106 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
1107 int btrfs_read_block_groups(struct btrfs_root
*root
);
1109 int btrfs_cow_block(struct btrfs_trans_handle
*trans
, struct btrfs_root
1110 *root
, struct buffer_head
*buf
, struct buffer_head
1111 *parent
, int parent_slot
, struct buffer_head
1113 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1114 *root
, struct btrfs_path
*path
, u32 data_size
);
1115 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
1116 struct btrfs_root
*root
,
1117 struct btrfs_path
*path
,
1119 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1120 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
1122 int btrfs_realloc_node(struct btrfs_trans_handle
*trans
,
1123 struct btrfs_root
*root
, struct buffer_head
*parent
,
1124 int cache_only
, u64
*last_ret
);
1125 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
1126 struct btrfs_path
*btrfs_alloc_path(void);
1127 void btrfs_free_path(struct btrfs_path
*p
);
1128 void btrfs_init_path(struct btrfs_path
*p
);
1129 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1130 struct btrfs_path
*path
);
1131 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1132 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1133 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1134 *root
, struct btrfs_path
*path
, struct btrfs_key
1135 *cpu_key
, u32 data_size
);
1136 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1137 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct btrfs_leaf
*leaf
);
1138 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1141 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1142 struct btrfs_key
*key
);
1143 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1144 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1146 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1147 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1149 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1150 btrfs_root_item
*item
, struct btrfs_key
*key
);
1151 int btrfs_find_dead_roots(struct btrfs_root
*root
, u64 objectid
,
1152 struct btrfs_root
*latest_root
);
1154 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1155 *root
, const char *name
, int name_len
, u64 dir
,
1156 struct btrfs_key
*location
, u8 type
);
1157 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1158 struct btrfs_root
*root
,
1159 struct btrfs_path
*path
, u64 dir
,
1160 const char *name
, int name_len
,
1162 struct btrfs_dir_item
*
1163 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1164 struct btrfs_root
*root
,
1165 struct btrfs_path
*path
, u64 dir
,
1166 u64 objectid
, const char *name
, int name_len
,
1168 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1169 struct btrfs_path
*path
,
1170 const char *name
, int name_len
);
1171 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1172 struct btrfs_root
*root
,
1173 struct btrfs_path
*path
,
1174 struct btrfs_dir_item
*di
);
1176 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1177 struct btrfs_root
*fs_root
,
1178 u64 dirid
, u64
*objectid
);
1179 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1182 int btrfs_insert_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1183 *root
, u64 objectid
, struct btrfs_inode_item
1185 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1186 *root
, struct btrfs_path
*path
,
1187 struct btrfs_key
*location
, int mod
);
1190 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1191 struct btrfs_root
*root
,
1192 u64 objectid
, u64 pos
, u64 offset
,
1193 u64 disk_num_blocks
,
1195 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1196 struct btrfs_root
*root
,
1197 struct btrfs_path
*path
, u64 objectid
,
1198 u64 blocknr
, int mod
);
1199 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1200 struct btrfs_root
*root
,
1201 u64 objectid
, u64 offset
,
1202 char *data
, size_t len
);
1203 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1204 struct btrfs_root
*root
,
1205 struct btrfs_path
*path
,
1206 u64 objectid
, u64 offset
,
1208 int btrfs_csum_truncate(struct btrfs_trans_handle
*trans
,
1209 struct btrfs_root
*root
, struct btrfs_path
*path
,
1212 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1213 int btrfs_readpage(struct file
*file
, struct page
*page
);
1214 void btrfs_delete_inode(struct inode
*inode
);
1215 void btrfs_read_locked_inode(struct inode
*inode
);
1216 int btrfs_write_inode(struct inode
*inode
, int wait
);
1217 void btrfs_dirty_inode(struct inode
*inode
);
1218 struct inode
*btrfs_alloc_inode(struct super_block
*sb
);
1219 void btrfs_destroy_inode(struct inode
*inode
);
1220 int btrfs_init_cachep(void);
1221 void btrfs_destroy_cachep(void);
1222 int btrfs_ioctl(struct inode
*inode
, struct file
*filp
, unsigned int cmd
,
1224 long btrfs_compat_ioctl(struct file
*file
, unsigned int cmd
,
1226 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1227 struct btrfs_root
*root
);
1228 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1229 unsigned from
, unsigned to
);
1230 int btrfs_get_block(struct inode
*inode
, sector_t iblock
,
1231 struct buffer_head
*result
, int create
);
1232 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1233 size_t page_offset
, u64 start
, u64 end
,
1235 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
1236 struct btrfs_root
*root
,
1237 struct inode
*inode
);
1239 int btrfs_drop_extent_cache(struct inode
*inode
, u64 start
, u64 end
);
1240 extern struct file_operations btrfs_file_operations
;
1241 int btrfs_drop_extents(struct btrfs_trans_handle
*trans
,
1242 struct btrfs_root
*root
, struct inode
*inode
,
1243 u64 start
, u64 end
, u64
*hint_block
);
1245 int btrfs_defrag_leaves(struct btrfs_trans_handle
*trans
,
1246 struct btrfs_root
*root
, int cache_only
);
1249 int btrfs_init_sysfs(void);
1250 void btrfs_exit_sysfs(void);
1251 int btrfs_sysfs_add_super(struct btrfs_fs_info
*fs
);
1252 int btrfs_sysfs_add_root(struct btrfs_root
*root
);
1253 void btrfs_sysfs_del_root(struct btrfs_root
*root
);
1254 void btrfs_sysfs_del_super(struct btrfs_fs_info
*root
);