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/highmem.h>
25 #include <linux/workqueue.h>
26 #include <linux/completion.h>
27 #include <asm/kmap_types.h>
28 #include "bit-radix.h"
29 #include "extent_map.h"
31 struct btrfs_trans_handle
;
32 struct btrfs_transaction
;
33 extern struct kmem_cache
*btrfs_trans_handle_cachep
;
34 extern struct kmem_cache
*btrfs_transaction_cachep
;
35 extern struct kmem_cache
*btrfs_bit_radix_cachep
;
36 extern struct kmem_cache
*btrfs_path_cachep
;
38 #define BTRFS_MAGIC "_B2RfS_M"
40 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
41 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
42 #define BTRFS_FS_TREE_OBJECTID 3ULL
43 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
44 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
47 * we can actually store much bigger names, but lets not confuse the rest
50 #define BTRFS_NAME_LEN 255
52 /* 32 bytes in various csum fields */
53 #define BTRFS_CSUM_SIZE 32
54 /* four bytes for CRC32 */
55 #define BTRFS_CRC32_SIZE 4
56 #define BTRFS_EMPTY_DIR_SIZE 6
58 #define BTRFS_FT_UNKNOWN 0
59 #define BTRFS_FT_REG_FILE 1
60 #define BTRFS_FT_DIR 2
61 #define BTRFS_FT_CHRDEV 3
62 #define BTRFS_FT_BLKDEV 4
63 #define BTRFS_FT_FIFO 5
64 #define BTRFS_FT_SOCK 6
65 #define BTRFS_FT_SYMLINK 7
66 #define BTRFS_FT_XATTR 8
67 #define BTRFS_FT_MAX 9
70 * the key defines the order in the tree, and so it also defines (optimal)
71 * block layout. objectid corresonds to the inode number. The flags
72 * tells us things about the object, and is a kind of stream selector.
73 * so for a given inode, keys with flags of 1 might refer to the inode
74 * data, flags of 2 may point to file data in the btree and flags == 3
75 * may point to extents.
77 * offset is the starting byte offset for this key in the stream.
79 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
80 * in cpu native order. Otherwise they are identical and their sizes
81 * should be the same (ie both packed)
83 struct btrfs_disk_key
{
87 } __attribute__ ((__packed__
));
93 } __attribute__ ((__packed__
));
95 #define BTRFS_FSID_SIZE 16
97 * every tree block (leaf or node) starts with this header.
100 u8 csum
[BTRFS_CSUM_SIZE
];
101 u8 fsid
[BTRFS_FSID_SIZE
]; /* FS specific uuid */
102 __le64 bytenr
; /* which block this node is supposed to live in */
108 } __attribute__ ((__packed__
));
110 #define BTRFS_MAX_LEVEL 8
111 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
112 sizeof(struct btrfs_header)) / \
113 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
114 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
115 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
116 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
117 sizeof(struct btrfs_item) - \
118 sizeof(struct btrfs_file_extent_item))
121 * the super block basically lists the main trees of the FS
122 * it currently lacks any block count etc etc
124 struct btrfs_super_block
{
125 u8 csum
[BTRFS_CSUM_SIZE
];
126 /* the first 3 fields must match struct btrfs_header */
127 u8 fsid
[16]; /* FS specific uuid */
128 __le64 bytenr
; /* this block number */
134 __le64 root_dir_objectid
;
140 } __attribute__ ((__packed__
));
143 * A leaf is full of items. offset and size tell us where to find
144 * the item in the leaf (relative to the start of the data area)
147 struct btrfs_disk_key key
;
150 } __attribute__ ((__packed__
));
153 * leaves have an item area and a data area:
154 * [item0, item1....itemN] [free space] [dataN...data1, data0]
156 * The data is separate from the items to get the keys closer together
160 struct btrfs_header header
;
161 struct btrfs_item items
[];
162 } __attribute__ ((__packed__
));
165 * all non-leaf blocks are nodes, they hold only keys and pointers to
168 struct btrfs_key_ptr
{
169 struct btrfs_disk_key key
;
171 } __attribute__ ((__packed__
));
174 struct btrfs_header header
;
175 struct btrfs_key_ptr ptrs
[];
176 } __attribute__ ((__packed__
));
179 * btrfs_paths remember the path taken from the root down to the leaf.
180 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
181 * to any other levels that are present.
183 * The slots array records the index of the item or block pointer
184 * used while walking the tree.
187 struct extent_buffer
*nodes
[BTRFS_MAX_LEVEL
];
188 int slots
[BTRFS_MAX_LEVEL
];
194 * items in the extent btree are used to record the objectid of the
195 * owner of the block and the number of references
197 struct btrfs_extent_item
{
200 } __attribute__ ((__packed__
));
202 struct btrfs_inode_timespec
{
205 } __attribute__ ((__packed__
));
208 * there is no padding here on purpose. If you want to extent the inode,
209 * make a new item type
211 struct btrfs_inode_item
{
223 struct btrfs_inode_timespec atime
;
224 struct btrfs_inode_timespec ctime
;
225 struct btrfs_inode_timespec mtime
;
226 struct btrfs_inode_timespec otime
;
227 } __attribute__ ((__packed__
));
229 struct btrfs_dir_item
{
230 struct btrfs_disk_key location
;
234 } __attribute__ ((__packed__
));
236 struct btrfs_root_item
{
237 struct btrfs_inode_item inode
;
244 struct btrfs_disk_key drop_progress
;
247 } __attribute__ ((__packed__
));
249 #define BTRFS_FILE_EXTENT_REG 0
250 #define BTRFS_FILE_EXTENT_INLINE 1
252 struct btrfs_file_extent_item
{
256 * disk space consumed by the extent, checksum blocks are included
260 __le64 disk_num_bytes
;
262 * the logical offset in file blocks (no csums)
263 * this extent record is for. This allows a file extent to point
264 * into the middle of an existing extent on disk, sharing it
265 * between two snapshots (useful if some bytes in the middle of the
266 * extent have changed
270 * the logical number of file blocks (no csums included)
273 } __attribute__ ((__packed__
));
275 struct btrfs_csum_item
{
277 } __attribute__ ((__packed__
));
279 /* tag for the radix tree of block groups in ram */
280 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
283 #define BTRFS_BLOCK_GROUP_DATA 1
284 #define BTRFS_BLOCK_GROUP_MIXED 2
286 struct btrfs_block_group_item
{
289 } __attribute__ ((__packed__
));
291 struct btrfs_block_group_cache
{
292 struct btrfs_key key
;
293 struct btrfs_block_group_item item
;
298 struct btrfs_fs_info
{
299 u8 fsid
[BTRFS_FSID_SIZE
];
300 struct btrfs_root
*extent_root
;
301 struct btrfs_root
*tree_root
;
302 struct radix_tree_root fs_roots_radix
;
304 struct extent_map_tree free_space_cache
;
305 struct extent_map_tree block_group_cache
;
306 struct extent_map_tree pinned_extents
;
307 struct extent_map_tree pending_del
;
308 struct extent_map_tree extent_ins
;
311 u64 last_trans_committed
;
312 struct btrfs_transaction
*running_transaction
;
313 struct btrfs_super_block super_copy
;
314 struct extent_buffer
*sb_buffer
;
315 struct super_block
*sb
;
316 struct inode
*btree_inode
;
317 spinlock_t hash_lock
;
318 struct mutex trans_mutex
;
319 struct mutex fs_mutex
;
320 struct list_head trans_list
;
321 struct list_head hashers
;
322 struct list_head dead_roots
;
323 struct delayed_work trans_work
;
324 struct kobject super_kobj
;
325 struct completion kobj_unregister
;
332 * in ram representation of the tree. extent_root is used for all allocations
333 * and for the extent tree extent_root root.
336 struct extent_buffer
*node
;
337 struct extent_buffer
*commit_root
;
338 struct btrfs_root_item root_item
;
339 struct btrfs_key root_key
;
340 struct btrfs_fs_info
*fs_info
;
342 struct kobject root_kobj
;
343 struct completion kobj_unregister
;
344 struct rw_semaphore snap_sem
;
348 /* data allocations are done in sectorsize units */
351 /* node allocations are done in nodesize units */
354 /* leaf allocations are done in leafsize units */
361 u64 last_inode_alloc
;
363 struct btrfs_key defrag_progress
;
370 * inode items have the data typically returned from stat and store other
371 * info about object characteristics. There is one for every file and dir in
374 #define BTRFS_INODE_ITEM_KEY 1
375 #define BTRFS_XATTR_ITEM_KEY 2
376 /* reserve 2-15 close to the inode for later flexibility */
379 * dir items are the name -> inode pointers in a directory. There is one
380 * for every name in a directory.
382 #define BTRFS_DIR_ITEM_KEY 16
383 #define BTRFS_DIR_INDEX_KEY 17
385 * extent data is for file data
387 #define BTRFS_EXTENT_DATA_KEY 18
389 * csum items have the checksums for data in the extents
391 #define BTRFS_CSUM_ITEM_KEY 19
393 /* reserve 20-31 for other file stuff */
396 * root items point to tree roots. There are typically in the root
397 * tree used by the super block to find all the other trees
399 #define BTRFS_ROOT_ITEM_KEY 32
401 * extent items are in the extent map tree. These record which blocks
402 * are used, and how many references there are to each block
404 #define BTRFS_EXTENT_ITEM_KEY 33
407 * block groups give us hints into the extent allocation trees. Which
408 * blocks are free etc etc
410 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
413 * string items are for debugging. They just store a short string of
416 #define BTRFS_STRING_ITEM_KEY 253
418 /* some macros to generate set/get funcs for the struct fields. This
419 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
422 #define le8_to_cpu(v) (v)
423 #define cpu_to_le8(v) (v)
426 #define read_eb_member(eb, ptr, type, member, result) ( \
427 read_extent_buffer(eb, (char *)(result), \
428 ((unsigned long)(ptr)) + \
429 offsetof(type, member), \
430 sizeof(((type *)0)->member)))
432 #define write_eb_member(eb, ptr, type, member, result) ( \
433 write_extent_buffer(eb, (char *)(result), \
434 ((unsigned long)(ptr)) + \
435 offsetof(type, member), \
436 sizeof(((type *)0)->member)))
438 #ifndef BTRFS_SETGET_FUNCS
439 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
440 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
441 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
444 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
445 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
447 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
448 unsigned long offset = offsetof(type, member); \
450 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
451 res = le##bits##_to_cpu(*tmp); \
452 kunmap_atomic(kaddr, KM_USER0); \
455 static inline void btrfs_set_##name(struct extent_buffer *eb, \
458 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
459 unsigned long offset = offsetof(type, member); \
460 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
461 *tmp = cpu_to_le##bits(val); \
462 kunmap_atomic(kaddr, KM_USER0); \
465 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
466 static inline u##bits btrfs_##name(type *s) \
468 return le##bits##_to_cpu(s->member); \
470 static inline void btrfs_set_##name(type *s, u##bits val) \
472 s->member = cpu_to_le##bits(val); \
475 /* struct btrfs_block_group_item */
476 BTRFS_SETGET_STACK_FUNCS(block_group_used
, struct btrfs_block_group_item
,
478 BTRFS_SETGET_FUNCS(disk_block_group_used
, struct btrfs_block_group_item
,
481 /* struct btrfs_inode_item */
482 BTRFS_SETGET_FUNCS(inode_generation
, struct btrfs_inode_item
, generation
, 64);
483 BTRFS_SETGET_FUNCS(inode_size
, struct btrfs_inode_item
, size
, 64);
484 BTRFS_SETGET_FUNCS(inode_nblocks
, struct btrfs_inode_item
, nblocks
, 64);
485 BTRFS_SETGET_FUNCS(inode_block_group
, struct btrfs_inode_item
, block_group
, 64);
486 BTRFS_SETGET_FUNCS(inode_nlink
, struct btrfs_inode_item
, nlink
, 32);
487 BTRFS_SETGET_FUNCS(inode_uid
, struct btrfs_inode_item
, uid
, 32);
488 BTRFS_SETGET_FUNCS(inode_gid
, struct btrfs_inode_item
, gid
, 32);
489 BTRFS_SETGET_FUNCS(inode_mode
, struct btrfs_inode_item
, mode
, 32);
490 BTRFS_SETGET_FUNCS(inode_rdev
, struct btrfs_inode_item
, rdev
, 32);
491 BTRFS_SETGET_FUNCS(inode_flags
, struct btrfs_inode_item
, flags
, 16);
492 BTRFS_SETGET_FUNCS(inode_compat_flags
, struct btrfs_inode_item
,
495 static inline struct btrfs_inode_timespec
*
496 btrfs_inode_atime(struct btrfs_inode_item
*inode_item
)
498 unsigned long ptr
= (unsigned long)inode_item
;
499 ptr
+= offsetof(struct btrfs_inode_item
, atime
);
500 return (struct btrfs_inode_timespec
*)ptr
;
503 static inline struct btrfs_inode_timespec
*
504 btrfs_inode_mtime(struct btrfs_inode_item
*inode_item
)
506 unsigned long ptr
= (unsigned long)inode_item
;
507 ptr
+= offsetof(struct btrfs_inode_item
, mtime
);
508 return (struct btrfs_inode_timespec
*)ptr
;
511 static inline struct btrfs_inode_timespec
*
512 btrfs_inode_ctime(struct btrfs_inode_item
*inode_item
)
514 unsigned long ptr
= (unsigned long)inode_item
;
515 ptr
+= offsetof(struct btrfs_inode_item
, ctime
);
516 return (struct btrfs_inode_timespec
*)ptr
;
519 static inline struct btrfs_inode_timespec
*
520 btrfs_inode_otime(struct btrfs_inode_item
*inode_item
)
522 unsigned long ptr
= (unsigned long)inode_item
;
523 ptr
+= offsetof(struct btrfs_inode_item
, otime
);
524 return (struct btrfs_inode_timespec
*)ptr
;
527 BTRFS_SETGET_FUNCS(timespec_sec
, struct btrfs_inode_timespec
, sec
, 64);
528 BTRFS_SETGET_FUNCS(timespec_nsec
, struct btrfs_inode_timespec
, nsec
, 32);
530 /* struct btrfs_extent_item */
531 BTRFS_SETGET_FUNCS(extent_refs
, struct btrfs_extent_item
, refs
, 32);
532 BTRFS_SETGET_FUNCS(extent_owner
, struct btrfs_extent_item
, owner
, 64);
534 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs
, struct btrfs_extent_item
,
536 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner
, struct btrfs_extent_item
,
539 /* struct btrfs_node */
540 BTRFS_SETGET_FUNCS(key_blockptr
, struct btrfs_key_ptr
, blockptr
, 64);
542 static inline u64
btrfs_node_blockptr(struct extent_buffer
*eb
, int nr
)
545 ptr
= offsetof(struct btrfs_node
, ptrs
) +
546 sizeof(struct btrfs_key_ptr
) * nr
;
547 return btrfs_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
);
550 static inline void btrfs_set_node_blockptr(struct extent_buffer
*eb
,
554 ptr
= offsetof(struct btrfs_node
, ptrs
) +
555 sizeof(struct btrfs_key_ptr
) * nr
;
556 btrfs_set_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
559 static inline unsigned long btrfs_node_key_ptr_offset(int nr
)
561 return offsetof(struct btrfs_node
, ptrs
) +
562 sizeof(struct btrfs_key_ptr
) * nr
;
565 void btrfs_node_key(struct extent_buffer
*eb
,
566 struct btrfs_disk_key
*disk_key
, int nr
);
568 static inline void btrfs_set_node_key(struct extent_buffer
*eb
,
569 struct btrfs_disk_key
*disk_key
, int nr
)
572 ptr
= btrfs_node_key_ptr_offset(nr
);
573 write_eb_member(eb
, (struct btrfs_key_ptr
*)ptr
,
574 struct btrfs_key_ptr
, key
, disk_key
);
577 /* struct btrfs_item */
578 BTRFS_SETGET_FUNCS(item_offset
, struct btrfs_item
, offset
, 32);
579 BTRFS_SETGET_FUNCS(item_size
, struct btrfs_item
, size
, 32);
581 static inline unsigned long btrfs_item_nr_offset(int nr
)
583 return offsetof(struct btrfs_leaf
, items
) +
584 sizeof(struct btrfs_item
) * nr
;
587 static inline struct btrfs_item
*btrfs_item_nr(struct extent_buffer
*eb
,
590 return (struct btrfs_item
*)btrfs_item_nr_offset(nr
);
593 static inline u32
btrfs_item_end(struct extent_buffer
*eb
,
594 struct btrfs_item
*item
)
596 return btrfs_item_offset(eb
, item
) + btrfs_item_size(eb
, item
);
599 static inline u32
btrfs_item_end_nr(struct extent_buffer
*eb
, int nr
)
601 return btrfs_item_end(eb
, btrfs_item_nr(eb
, nr
));
604 static inline u32
btrfs_item_offset_nr(struct extent_buffer
*eb
, int nr
)
606 return btrfs_item_offset(eb
, btrfs_item_nr(eb
, nr
));
609 static inline u32
btrfs_item_size_nr(struct extent_buffer
*eb
, int nr
)
611 return btrfs_item_size(eb
, btrfs_item_nr(eb
, nr
));
614 static inline void btrfs_item_key(struct extent_buffer
*eb
,
615 struct btrfs_disk_key
*disk_key
, int nr
)
617 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
618 read_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
621 static inline void btrfs_set_item_key(struct extent_buffer
*eb
,
622 struct btrfs_disk_key
*disk_key
, int nr
)
624 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
625 write_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
628 /* struct btrfs_dir_item */
629 BTRFS_SETGET_FUNCS(dir_data_len
, struct btrfs_dir_item
, data_len
, 16);
630 BTRFS_SETGET_FUNCS(dir_type
, struct btrfs_dir_item
, type
, 8);
631 BTRFS_SETGET_FUNCS(dir_name_len
, struct btrfs_dir_item
, name_len
, 16);
633 static inline void btrfs_dir_item_key(struct extent_buffer
*eb
,
634 struct btrfs_dir_item
*item
,
635 struct btrfs_disk_key
*key
)
637 read_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
640 static inline void btrfs_set_dir_item_key(struct extent_buffer
*eb
,
641 struct btrfs_dir_item
*item
,
642 struct btrfs_disk_key
*key
)
644 write_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
647 /* struct btrfs_disk_key */
648 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid
, struct btrfs_disk_key
,
650 BTRFS_SETGET_STACK_FUNCS(disk_key_offset
, struct btrfs_disk_key
, offset
, 64);
651 BTRFS_SETGET_STACK_FUNCS(disk_key_type
, struct btrfs_disk_key
, type
, 8);
653 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
654 struct btrfs_disk_key
*disk
)
656 cpu
->offset
= le64_to_cpu(disk
->offset
);
657 cpu
->type
= disk
->type
;
658 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
661 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
662 struct btrfs_key
*cpu
)
664 disk
->offset
= cpu_to_le64(cpu
->offset
);
665 disk
->type
= cpu
->type
;
666 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
669 static inline void btrfs_node_key_to_cpu(struct extent_buffer
*eb
,
670 struct btrfs_key
*key
, int nr
)
672 struct btrfs_disk_key disk_key
;
673 btrfs_node_key(eb
, &disk_key
, nr
);
674 btrfs_disk_key_to_cpu(key
, &disk_key
);
677 static inline void btrfs_item_key_to_cpu(struct extent_buffer
*eb
,
678 struct btrfs_key
*key
, int nr
)
680 struct btrfs_disk_key disk_key
;
681 btrfs_item_key(eb
, &disk_key
, nr
);
682 btrfs_disk_key_to_cpu(key
, &disk_key
);
685 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer
*eb
,
686 struct btrfs_dir_item
*item
,
687 struct btrfs_key
*key
)
689 struct btrfs_disk_key disk_key
;
690 btrfs_dir_item_key(eb
, item
, &disk_key
);
691 btrfs_disk_key_to_cpu(key
, &disk_key
);
695 static inline u8
btrfs_key_type(struct btrfs_key
*key
)
700 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u8 val
)
705 /* struct btrfs_header */
706 BTRFS_SETGET_HEADER_FUNCS(header_bytenr
, struct btrfs_header
, bytenr
, 64);
707 BTRFS_SETGET_HEADER_FUNCS(header_generation
, struct btrfs_header
,
709 BTRFS_SETGET_HEADER_FUNCS(header_owner
, struct btrfs_header
, owner
, 64);
710 BTRFS_SETGET_HEADER_FUNCS(header_nritems
, struct btrfs_header
, nritems
, 32);
711 BTRFS_SETGET_HEADER_FUNCS(header_flags
, struct btrfs_header
, flags
, 16);
712 BTRFS_SETGET_HEADER_FUNCS(header_level
, struct btrfs_header
, level
, 8);
714 static inline u8
*btrfs_header_fsid(struct extent_buffer
*eb
)
716 unsigned long ptr
= offsetof(struct btrfs_header
, fsid
);
720 static inline u8
*btrfs_super_fsid(struct extent_buffer
*eb
)
722 unsigned long ptr
= offsetof(struct btrfs_super_block
, fsid
);
726 static inline u8
*btrfs_header_csum(struct extent_buffer
*eb
)
728 unsigned long ptr
= offsetof(struct btrfs_header
, csum
);
732 static inline struct btrfs_node
*btrfs_buffer_node(struct extent_buffer
*eb
)
737 static inline struct btrfs_leaf
*btrfs_buffer_leaf(struct extent_buffer
*eb
)
742 static inline struct btrfs_header
*btrfs_buffer_header(struct extent_buffer
*eb
)
747 static inline int btrfs_is_leaf(struct extent_buffer
*eb
)
749 return (btrfs_header_level(eb
) == 0);
752 /* struct btrfs_root_item */
753 BTRFS_SETGET_FUNCS(disk_root_refs
, struct btrfs_root_item
, refs
, 32);
754 BTRFS_SETGET_FUNCS(disk_root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
755 BTRFS_SETGET_FUNCS(disk_root_level
, struct btrfs_root_item
, level
, 8);
757 BTRFS_SETGET_STACK_FUNCS(root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
758 BTRFS_SETGET_STACK_FUNCS(root_level
, struct btrfs_root_item
, level
, 8);
759 BTRFS_SETGET_STACK_FUNCS(root_dirid
, struct btrfs_root_item
, root_dirid
, 64);
760 BTRFS_SETGET_STACK_FUNCS(root_refs
, struct btrfs_root_item
, refs
, 32);
761 BTRFS_SETGET_STACK_FUNCS(root_flags
, struct btrfs_root_item
, flags
, 32);
762 BTRFS_SETGET_STACK_FUNCS(root_used
, struct btrfs_root_item
, bytes_used
, 64);
763 BTRFS_SETGET_STACK_FUNCS(root_limit
, struct btrfs_root_item
, byte_limit
, 64);
765 /* struct btrfs_super_block */
766 BTRFS_SETGET_STACK_FUNCS(super_bytenr
, struct btrfs_super_block
, bytenr
, 64);
767 BTRFS_SETGET_STACK_FUNCS(super_generation
, struct btrfs_super_block
,
769 BTRFS_SETGET_STACK_FUNCS(super_root
, struct btrfs_super_block
, root
, 64);
770 BTRFS_SETGET_STACK_FUNCS(super_root_level
, struct btrfs_super_block
,
772 BTRFS_SETGET_STACK_FUNCS(super_total_bytes
, struct btrfs_super_block
,
774 BTRFS_SETGET_STACK_FUNCS(super_bytes_used
, struct btrfs_super_block
,
776 BTRFS_SETGET_STACK_FUNCS(super_sectorsize
, struct btrfs_super_block
,
778 BTRFS_SETGET_STACK_FUNCS(super_nodesize
, struct btrfs_super_block
,
780 BTRFS_SETGET_STACK_FUNCS(super_leafsize
, struct btrfs_super_block
,
782 BTRFS_SETGET_STACK_FUNCS(super_stripesize
, struct btrfs_super_block
,
784 BTRFS_SETGET_STACK_FUNCS(super_root_dir
, struct btrfs_super_block
,
785 root_dir_objectid
, 64);
787 static inline unsigned long btrfs_leaf_data(struct extent_buffer
*l
)
789 return offsetof(struct btrfs_leaf
, items
);
792 /* struct btrfs_file_extent_item */
793 BTRFS_SETGET_FUNCS(file_extent_type
, struct btrfs_file_extent_item
, type
, 8);
795 static inline unsigned long btrfs_file_extent_inline_start(struct
796 btrfs_file_extent_item
*e
)
798 unsigned long offset
= (unsigned long)e
;
799 offset
+= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
803 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
805 return offsetof(struct btrfs_file_extent_item
, disk_bytenr
) + datasize
;
808 static inline u32
btrfs_file_extent_inline_len(struct extent_buffer
*eb
,
809 struct btrfs_item
*e
)
811 unsigned long offset
;
812 offset
= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
813 return btrfs_item_size(eb
, e
) - offset
;
816 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr
, struct btrfs_file_extent_item
,
818 BTRFS_SETGET_FUNCS(file_extent_generation
, struct btrfs_file_extent_item
,
820 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes
, struct btrfs_file_extent_item
,
822 BTRFS_SETGET_FUNCS(file_extent_offset
, struct btrfs_file_extent_item
,
824 BTRFS_SETGET_FUNCS(file_extent_num_bytes
, struct btrfs_file_extent_item
,
827 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
829 return sb
->s_fs_info
;
832 static inline int btrfs_set_root_name(struct btrfs_root
*root
,
833 const char *name
, int len
)
835 /* if we already have a name just free it */
839 root
->name
= kmalloc(len
+1, GFP_KERNEL
);
843 memcpy(root
->name
, name
, len
);
844 root
->name
[len
] ='\0';
849 static inline u32
btrfs_level_size(struct btrfs_root
*root
, int level
) {
851 return root
->leafsize
;
852 return root
->nodesize
;
855 /* helper function to cast into the data area of the leaf. */
856 #define btrfs_item_ptr(leaf, slot, type) \
857 ((type *)(btrfs_leaf_data(leaf) + \
858 btrfs_item_offset_nr(leaf, slot)))
860 #define btrfs_item_ptr_offset(leaf, slot) \
861 ((unsigned long)(btrfs_leaf_data(leaf) + \
862 btrfs_item_offset_nr(leaf, slot)))
864 /* mount option defines and helpers */
865 #define BTRFS_MOUNT_SUBVOL 0x000001
866 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
867 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
868 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
871 int btrfs_extent_post_op(struct btrfs_trans_handle
*trans
,
872 struct btrfs_root
*root
);
873 int btrfs_copy_pinned(struct btrfs_root
*root
, struct extent_map_tree
*copy
);
874 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
877 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
878 struct btrfs_block_group_cache
879 *hint
, u64 search_start
,
880 int data
, int owner
);
881 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
882 struct btrfs_root
*root
);
883 struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
884 struct btrfs_root
*root
, u32 size
,
885 u64 hint
, u64 empty_size
);
886 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
887 struct btrfs_root
*root
, u64 owner
,
888 u64 num_bytes
, u64 empty_size
, u64 search_start
,
889 u64 search_end
, struct btrfs_key
*ins
, int data
);
890 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
891 struct extent_buffer
*buf
);
892 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
893 *root
, u64 bytenr
, u64 num_bytes
, int pin
);
894 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
895 struct btrfs_root
*root
,
896 struct extent_map_tree
*unpin
);
897 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
898 struct btrfs_root
*root
,
899 u64 bytenr
, u64 num_bytes
);
900 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
901 struct btrfs_root
*root
);
902 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
903 int btrfs_read_block_groups(struct btrfs_root
*root
);
905 int btrfs_cow_block(struct btrfs_trans_handle
*trans
,
906 struct btrfs_root
*root
, struct extent_buffer
*buf
,
907 struct extent_buffer
*parent
, int parent_slot
,
908 struct extent_buffer
**cow_ret
);
909 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
910 *root
, struct btrfs_path
*path
, u32 data_size
);
911 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
912 struct btrfs_root
*root
,
913 struct btrfs_path
*path
,
914 u32 new_size
, int from_end
);
915 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
916 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
918 int btrfs_realloc_node(struct btrfs_trans_handle
*trans
,
919 struct btrfs_root
*root
, struct extent_buffer
*parent
,
920 int start_slot
, int cache_only
, u64
*last_ret
,
921 struct btrfs_key
*progress
);
922 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
923 struct btrfs_path
*btrfs_alloc_path(void);
924 void btrfs_free_path(struct btrfs_path
*p
);
925 void btrfs_init_path(struct btrfs_path
*p
);
926 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
927 struct btrfs_path
*path
);
928 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
929 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
930 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
931 *root
, struct btrfs_path
*path
, struct btrfs_key
932 *cpu_key
, u32 data_size
);
933 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
934 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct extent_buffer
*leaf
);
935 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
938 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
939 struct btrfs_key
*key
);
940 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
941 *root
, struct btrfs_key
*key
, struct btrfs_root_item
943 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
944 *root
, struct btrfs_key
*key
, struct btrfs_root_item
946 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
947 btrfs_root_item
*item
, struct btrfs_key
*key
);
948 int btrfs_find_dead_roots(struct btrfs_root
*root
, u64 objectid
,
949 struct btrfs_root
*latest_root
);
951 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
952 *root
, const char *name
, int name_len
, u64 dir
,
953 struct btrfs_key
*location
, u8 type
);
954 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
955 struct btrfs_root
*root
,
956 struct btrfs_path
*path
, u64 dir
,
957 const char *name
, int name_len
,
959 struct btrfs_dir_item
*
960 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
961 struct btrfs_root
*root
,
962 struct btrfs_path
*path
, u64 dir
,
963 u64 objectid
, const char *name
, int name_len
,
965 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
966 struct btrfs_path
*path
,
967 const char *name
, int name_len
);
968 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
969 struct btrfs_root
*root
,
970 struct btrfs_path
*path
,
971 struct btrfs_dir_item
*di
);
972 int btrfs_insert_xattr_item(struct btrfs_trans_handle
*trans
,
973 struct btrfs_root
*root
, const char *name
,
974 u16 name_len
, const void *data
, u16 data_len
,
976 struct btrfs_dir_item
*btrfs_lookup_xattr(struct btrfs_trans_handle
*trans
,
977 struct btrfs_root
*root
,
978 struct btrfs_path
*path
, u64 dir
,
979 const char *name
, u16 name_len
,
982 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
983 struct btrfs_root
*fs_root
,
984 u64 dirid
, u64
*objectid
);
985 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
988 int btrfs_insert_empty_inode(struct btrfs_trans_handle
*trans
,
989 struct btrfs_root
*root
,
990 struct btrfs_path
*path
, u64 objectid
);
991 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
992 *root
, struct btrfs_path
*path
,
993 struct btrfs_key
*location
, int mod
);
996 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
997 struct btrfs_root
*root
,
998 u64 objectid
, u64 pos
, u64 offset
,
1001 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1002 struct btrfs_root
*root
,
1003 struct btrfs_path
*path
, u64 objectid
,
1004 u64 bytenr
, int mod
);
1005 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1006 struct btrfs_root
*root
,
1007 struct inode
*inode
,
1008 u64 objectid
, u64 offset
,
1009 char *data
, size_t len
);
1010 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1011 struct btrfs_root
*root
,
1012 struct btrfs_path
*path
,
1013 u64 objectid
, u64 offset
,
1015 int btrfs_csum_truncate(struct btrfs_trans_handle
*trans
,
1016 struct btrfs_root
*root
, struct btrfs_path
*path
,
1019 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1020 int btrfs_readpage(struct file
*file
, struct page
*page
);
1021 void btrfs_delete_inode(struct inode
*inode
);
1022 void btrfs_read_locked_inode(struct inode
*inode
);
1023 int btrfs_write_inode(struct inode
*inode
, int wait
);
1024 void btrfs_dirty_inode(struct inode
*inode
);
1025 struct inode
*btrfs_alloc_inode(struct super_block
*sb
);
1026 void btrfs_destroy_inode(struct inode
*inode
);
1027 int btrfs_init_cachep(void);
1028 void btrfs_destroy_cachep(void);
1029 long btrfs_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
1030 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1031 struct btrfs_root
*root
);
1032 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1033 unsigned from
, unsigned to
);
1034 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1035 size_t page_offset
, u64 start
, u64 end
,
1037 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
1038 struct btrfs_root
*root
,
1039 struct inode
*inode
);
1041 int btrfs_drop_extent_cache(struct inode
*inode
, u64 start
, u64 end
);
1042 extern struct file_operations btrfs_file_operations
;
1043 int btrfs_drop_extents(struct btrfs_trans_handle
*trans
,
1044 struct btrfs_root
*root
, struct inode
*inode
,
1045 u64 start
, u64 end
, u64 inline_limit
, u64
*hint_block
);
1047 int btrfs_defrag_leaves(struct btrfs_trans_handle
*trans
,
1048 struct btrfs_root
*root
, int cache_only
);
1051 int btrfs_init_sysfs(void);
1052 void btrfs_exit_sysfs(void);
1053 int btrfs_sysfs_add_super(struct btrfs_fs_info
*fs
);
1054 int btrfs_sysfs_add_root(struct btrfs_root
*root
);
1055 void btrfs_sysfs_del_root(struct btrfs_root
*root
);
1056 void btrfs_sysfs_del_super(struct btrfs_fs_info
*root
);
1059 ssize_t
btrfs_listxattr(struct dentry
*dentry
, char *buffer
, size_t size
);
1060 int btrfs_delete_xattrs(struct btrfs_trans_handle
*trans
,
1061 struct btrfs_root
*root
, struct inode
*inode
);