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_MAX_LEVEL 8
41 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
42 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
43 #define BTRFS_FS_TREE_OBJECTID 3ULL
44 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
45 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
48 * we can actually store much bigger names, but lets not confuse the rest
51 #define BTRFS_NAME_LEN 255
53 /* 32 bytes in various csum fields */
54 #define BTRFS_CSUM_SIZE 32
55 /* four bytes for CRC32 */
56 #define BTRFS_CRC32_SIZE 4
57 #define BTRFS_EMPTY_DIR_SIZE 0
59 #define BTRFS_FT_UNKNOWN 0
60 #define BTRFS_FT_REG_FILE 1
61 #define BTRFS_FT_DIR 2
62 #define BTRFS_FT_CHRDEV 3
63 #define BTRFS_FT_BLKDEV 4
64 #define BTRFS_FT_FIFO 5
65 #define BTRFS_FT_SOCK 6
66 #define BTRFS_FT_SYMLINK 7
67 #define BTRFS_FT_XATTR 8
68 #define BTRFS_FT_MAX 9
71 * the key defines the order in the tree, and so it also defines (optimal)
72 * block layout. objectid corresonds to the inode number. The flags
73 * tells us things about the object, and is a kind of stream selector.
74 * so for a given inode, keys with flags of 1 might refer to the inode
75 * data, flags of 2 may point to file data in the btree and flags == 3
76 * may point to extents.
78 * offset is the starting byte offset for this key in the stream.
80 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
81 * in cpu native order. Otherwise they are identical and their sizes
82 * should be the same (ie both packed)
84 struct btrfs_disk_key
{
88 } __attribute__ ((__packed__
));
94 } __attribute__ ((__packed__
));
96 #define BTRFS_FSID_SIZE 16
98 * every tree block (leaf or node) starts with this header.
100 struct btrfs_header
{
101 u8 csum
[BTRFS_CSUM_SIZE
];
102 u8 fsid
[BTRFS_FSID_SIZE
]; /* FS specific uuid */
103 __le64 bytenr
; /* which block this node is supposed to live in */
109 } __attribute__ ((__packed__
));
111 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
112 sizeof(struct btrfs_header)) / \
113 sizeof(struct btrfs_key_ptr))
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
;
172 } __attribute__ ((__packed__
));
175 struct btrfs_header header
;
176 struct btrfs_key_ptr ptrs
[];
177 } __attribute__ ((__packed__
));
180 * btrfs_paths remember the path taken from the root down to the leaf.
181 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
182 * to any other levels that are present.
184 * The slots array records the index of the item or block pointer
185 * used while walking the tree.
188 struct extent_buffer
*nodes
[BTRFS_MAX_LEVEL
];
189 int slots
[BTRFS_MAX_LEVEL
];
195 * items in the extent btree are used to record the objectid of the
196 * owner of the block and the number of references
198 struct btrfs_extent_item
{
200 } __attribute__ ((__packed__
));
202 struct btrfs_extent_ref
{
207 } __attribute__ ((__packed__
));
209 struct btrfs_inode_ref
{
212 } __attribute__ ((__packed__
));
214 struct btrfs_inode_timespec
{
217 } __attribute__ ((__packed__
));
220 * there is no padding here on purpose. If you want to extent the inode,
221 * make a new item type
223 struct btrfs_inode_item
{
235 struct btrfs_inode_timespec atime
;
236 struct btrfs_inode_timespec ctime
;
237 struct btrfs_inode_timespec mtime
;
238 struct btrfs_inode_timespec otime
;
239 } __attribute__ ((__packed__
));
241 struct btrfs_dir_item
{
242 struct btrfs_disk_key location
;
246 } __attribute__ ((__packed__
));
248 struct btrfs_root_item
{
249 struct btrfs_inode_item inode
;
256 struct btrfs_disk_key drop_progress
;
259 } __attribute__ ((__packed__
));
261 #define BTRFS_FILE_EXTENT_REG 0
262 #define BTRFS_FILE_EXTENT_INLINE 1
264 struct btrfs_file_extent_item
{
268 * disk space consumed by the extent, checksum blocks are included
272 __le64 disk_num_bytes
;
274 * the logical offset in file blocks (no csums)
275 * this extent record is for. This allows a file extent to point
276 * into the middle of an existing extent on disk, sharing it
277 * between two snapshots (useful if some bytes in the middle of the
278 * extent have changed
282 * the logical number of file blocks (no csums included)
285 } __attribute__ ((__packed__
));
287 struct btrfs_csum_item
{
289 } __attribute__ ((__packed__
));
291 /* tag for the radix tree of block groups in ram */
292 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
295 #define BTRFS_BLOCK_GROUP_DATA 1
296 #define BTRFS_BLOCK_GROUP_MIXED 2
298 struct btrfs_block_group_item
{
301 } __attribute__ ((__packed__
));
303 struct btrfs_block_group_cache
{
304 struct btrfs_key key
;
305 struct btrfs_block_group_item item
;
310 struct btrfs_fs_info
{
311 u8 fsid
[BTRFS_FSID_SIZE
];
312 struct btrfs_root
*extent_root
;
313 struct btrfs_root
*tree_root
;
314 struct radix_tree_root fs_roots_radix
;
316 struct extent_map_tree free_space_cache
;
317 struct extent_map_tree block_group_cache
;
318 struct extent_map_tree pinned_extents
;
319 struct extent_map_tree pending_del
;
320 struct extent_map_tree extent_ins
;
323 u64 last_trans_committed
;
324 struct btrfs_transaction
*running_transaction
;
325 struct btrfs_super_block super_copy
;
326 struct extent_buffer
*sb_buffer
;
327 struct super_block
*sb
;
328 struct inode
*btree_inode
;
329 spinlock_t hash_lock
;
330 struct mutex trans_mutex
;
331 struct mutex fs_mutex
;
332 struct list_head trans_list
;
333 struct list_head hashers
;
334 struct list_head dead_roots
;
335 struct delayed_work trans_work
;
336 struct kobject super_kobj
;
337 struct completion kobj_unregister
;
344 * in ram representation of the tree. extent_root is used for all allocations
345 * and for the extent tree extent_root root.
348 struct extent_buffer
*node
;
349 struct extent_buffer
*commit_root
;
350 struct btrfs_root_item root_item
;
351 struct btrfs_key root_key
;
352 struct btrfs_fs_info
*fs_info
;
354 struct kobject root_kobj
;
355 struct completion kobj_unregister
;
356 struct rw_semaphore snap_sem
;
360 /* data allocations are done in sectorsize units */
363 /* node allocations are done in nodesize units */
366 /* leaf allocations are done in leafsize units */
373 u64 last_inode_alloc
;
375 struct btrfs_key defrag_progress
;
382 * inode items have the data typically returned from stat and store other
383 * info about object characteristics. There is one for every file and dir in
386 #define BTRFS_INODE_ITEM_KEY 1
387 #define BTRFS_INODE_REF_KEY 2
388 #define BTRFS_XATTR_ITEM_KEY 8
389 /* reserve 2-15 close to the inode for later flexibility */
392 * dir items are the name -> inode pointers in a directory. There is one
393 * for every name in a directory.
395 #define BTRFS_DIR_ITEM_KEY 16
396 #define BTRFS_DIR_INDEX_KEY 17
398 * extent data is for file data
400 #define BTRFS_EXTENT_DATA_KEY 18
402 * csum items have the checksums for data in the extents
404 #define BTRFS_CSUM_ITEM_KEY 19
406 /* reserve 20-31 for other file stuff */
409 * root items point to tree roots. There are typically in the root
410 * tree used by the super block to find all the other trees
412 #define BTRFS_ROOT_ITEM_KEY 32
414 * extent items are in the extent map tree. These record which blocks
415 * are used, and how many references there are to each block
417 #define BTRFS_EXTENT_ITEM_KEY 33
418 #define BTRFS_EXTENT_REF_KEY 34
421 * block groups give us hints into the extent allocation trees. Which
422 * blocks are free etc etc
424 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
427 * string items are for debugging. They just store a short string of
430 #define BTRFS_STRING_ITEM_KEY 253
432 /* some macros to generate set/get funcs for the struct fields. This
433 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
436 #define le8_to_cpu(v) (v)
437 #define cpu_to_le8(v) (v)
440 #define read_eb_member(eb, ptr, type, member, result) ( \
441 read_extent_buffer(eb, (char *)(result), \
442 ((unsigned long)(ptr)) + \
443 offsetof(type, member), \
444 sizeof(((type *)0)->member)))
446 #define write_eb_member(eb, ptr, type, member, result) ( \
447 write_extent_buffer(eb, (char *)(result), \
448 ((unsigned long)(ptr)) + \
449 offsetof(type, member), \
450 sizeof(((type *)0)->member)))
452 #ifndef BTRFS_SETGET_FUNCS
453 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
454 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
455 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
458 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
459 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
461 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
462 unsigned long offset = offsetof(type, member); \
464 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
465 res = le##bits##_to_cpu(*tmp); \
466 kunmap_atomic(kaddr, KM_USER0); \
469 static inline void btrfs_set_##name(struct extent_buffer *eb, \
472 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
473 unsigned long offset = offsetof(type, member); \
474 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
475 *tmp = cpu_to_le##bits(val); \
476 kunmap_atomic(kaddr, KM_USER0); \
479 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
480 static inline u##bits btrfs_##name(type *s) \
482 return le##bits##_to_cpu(s->member); \
484 static inline void btrfs_set_##name(type *s, u##bits val) \
486 s->member = cpu_to_le##bits(val); \
489 /* struct btrfs_block_group_item */
490 BTRFS_SETGET_STACK_FUNCS(block_group_used
, struct btrfs_block_group_item
,
492 BTRFS_SETGET_FUNCS(disk_block_group_used
, struct btrfs_block_group_item
,
495 /* struct btrfs_inode_ref */
496 BTRFS_SETGET_FUNCS(inode_ref_name_len
, struct btrfs_inode_ref
, name_len
, 16);
498 /* struct btrfs_inode_item */
499 BTRFS_SETGET_FUNCS(inode_generation
, struct btrfs_inode_item
, generation
, 64);
500 BTRFS_SETGET_FUNCS(inode_size
, struct btrfs_inode_item
, size
, 64);
501 BTRFS_SETGET_FUNCS(inode_nblocks
, struct btrfs_inode_item
, nblocks
, 64);
502 BTRFS_SETGET_FUNCS(inode_block_group
, struct btrfs_inode_item
, block_group
, 64);
503 BTRFS_SETGET_FUNCS(inode_nlink
, struct btrfs_inode_item
, nlink
, 32);
504 BTRFS_SETGET_FUNCS(inode_uid
, struct btrfs_inode_item
, uid
, 32);
505 BTRFS_SETGET_FUNCS(inode_gid
, struct btrfs_inode_item
, gid
, 32);
506 BTRFS_SETGET_FUNCS(inode_mode
, struct btrfs_inode_item
, mode
, 32);
507 BTRFS_SETGET_FUNCS(inode_rdev
, struct btrfs_inode_item
, rdev
, 32);
508 BTRFS_SETGET_FUNCS(inode_flags
, struct btrfs_inode_item
, flags
, 16);
509 BTRFS_SETGET_FUNCS(inode_compat_flags
, struct btrfs_inode_item
,
512 static inline struct btrfs_inode_timespec
*
513 btrfs_inode_atime(struct btrfs_inode_item
*inode_item
)
515 unsigned long ptr
= (unsigned long)inode_item
;
516 ptr
+= offsetof(struct btrfs_inode_item
, atime
);
517 return (struct btrfs_inode_timespec
*)ptr
;
520 static inline struct btrfs_inode_timespec
*
521 btrfs_inode_mtime(struct btrfs_inode_item
*inode_item
)
523 unsigned long ptr
= (unsigned long)inode_item
;
524 ptr
+= offsetof(struct btrfs_inode_item
, mtime
);
525 return (struct btrfs_inode_timespec
*)ptr
;
528 static inline struct btrfs_inode_timespec
*
529 btrfs_inode_ctime(struct btrfs_inode_item
*inode_item
)
531 unsigned long ptr
= (unsigned long)inode_item
;
532 ptr
+= offsetof(struct btrfs_inode_item
, ctime
);
533 return (struct btrfs_inode_timespec
*)ptr
;
536 static inline struct btrfs_inode_timespec
*
537 btrfs_inode_otime(struct btrfs_inode_item
*inode_item
)
539 unsigned long ptr
= (unsigned long)inode_item
;
540 ptr
+= offsetof(struct btrfs_inode_item
, otime
);
541 return (struct btrfs_inode_timespec
*)ptr
;
544 BTRFS_SETGET_FUNCS(timespec_sec
, struct btrfs_inode_timespec
, sec
, 64);
545 BTRFS_SETGET_FUNCS(timespec_nsec
, struct btrfs_inode_timespec
, nsec
, 32);
547 /* struct btrfs_extent_item */
548 BTRFS_SETGET_FUNCS(extent_refs
, struct btrfs_extent_item
, refs
, 32);
550 /* struct btrfs_extent_ref */
551 BTRFS_SETGET_FUNCS(ref_root
, struct btrfs_extent_ref
, root
, 64);
552 BTRFS_SETGET_FUNCS(ref_generation
, struct btrfs_extent_ref
, generation
, 64);
553 BTRFS_SETGET_FUNCS(ref_objectid
, struct btrfs_extent_ref
, objectid
, 64);
554 BTRFS_SETGET_FUNCS(ref_offset
, struct btrfs_extent_ref
, offset
, 64);
556 BTRFS_SETGET_STACK_FUNCS(stack_ref_root
, struct btrfs_extent_ref
, root
, 64);
557 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation
, struct btrfs_extent_ref
,
559 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid
, struct btrfs_extent_ref
,
561 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset
, struct btrfs_extent_ref
, offset
, 64);
563 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs
, struct btrfs_extent_item
,
566 /* struct btrfs_node */
567 BTRFS_SETGET_FUNCS(key_blockptr
, struct btrfs_key_ptr
, blockptr
, 64);
568 BTRFS_SETGET_FUNCS(key_generation
, struct btrfs_key_ptr
, generation
, 64);
570 static inline u64
btrfs_node_blockptr(struct extent_buffer
*eb
, int nr
)
573 ptr
= offsetof(struct btrfs_node
, ptrs
) +
574 sizeof(struct btrfs_key_ptr
) * nr
;
575 return btrfs_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
);
578 static inline void btrfs_set_node_blockptr(struct extent_buffer
*eb
,
582 ptr
= offsetof(struct btrfs_node
, ptrs
) +
583 sizeof(struct btrfs_key_ptr
) * nr
;
584 btrfs_set_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
587 static inline u64
btrfs_node_ptr_generation(struct extent_buffer
*eb
, int nr
)
590 ptr
= offsetof(struct btrfs_node
, ptrs
) +
591 sizeof(struct btrfs_key_ptr
) * nr
;
592 return btrfs_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
);
595 static inline void btrfs_set_node_ptr_generation(struct extent_buffer
*eb
,
599 ptr
= offsetof(struct btrfs_node
, ptrs
) +
600 sizeof(struct btrfs_key_ptr
) * nr
;
601 btrfs_set_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
604 static inline unsigned long btrfs_node_key_ptr_offset(int nr
)
606 return offsetof(struct btrfs_node
, ptrs
) +
607 sizeof(struct btrfs_key_ptr
) * nr
;
610 void btrfs_node_key(struct extent_buffer
*eb
,
611 struct btrfs_disk_key
*disk_key
, int nr
);
613 static inline void btrfs_set_node_key(struct extent_buffer
*eb
,
614 struct btrfs_disk_key
*disk_key
, int nr
)
617 ptr
= btrfs_node_key_ptr_offset(nr
);
618 write_eb_member(eb
, (struct btrfs_key_ptr
*)ptr
,
619 struct btrfs_key_ptr
, key
, disk_key
);
622 /* struct btrfs_item */
623 BTRFS_SETGET_FUNCS(item_offset
, struct btrfs_item
, offset
, 32);
624 BTRFS_SETGET_FUNCS(item_size
, struct btrfs_item
, size
, 32);
626 static inline unsigned long btrfs_item_nr_offset(int nr
)
628 return offsetof(struct btrfs_leaf
, items
) +
629 sizeof(struct btrfs_item
) * nr
;
632 static inline struct btrfs_item
*btrfs_item_nr(struct extent_buffer
*eb
,
635 return (struct btrfs_item
*)btrfs_item_nr_offset(nr
);
638 static inline u32
btrfs_item_end(struct extent_buffer
*eb
,
639 struct btrfs_item
*item
)
641 return btrfs_item_offset(eb
, item
) + btrfs_item_size(eb
, item
);
644 static inline u32
btrfs_item_end_nr(struct extent_buffer
*eb
, int nr
)
646 return btrfs_item_end(eb
, btrfs_item_nr(eb
, nr
));
649 static inline u32
btrfs_item_offset_nr(struct extent_buffer
*eb
, int nr
)
651 return btrfs_item_offset(eb
, btrfs_item_nr(eb
, nr
));
654 static inline u32
btrfs_item_size_nr(struct extent_buffer
*eb
, int nr
)
656 return btrfs_item_size(eb
, btrfs_item_nr(eb
, nr
));
659 static inline void btrfs_item_key(struct extent_buffer
*eb
,
660 struct btrfs_disk_key
*disk_key
, int nr
)
662 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
663 read_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
666 static inline void btrfs_set_item_key(struct extent_buffer
*eb
,
667 struct btrfs_disk_key
*disk_key
, int nr
)
669 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
670 write_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
673 /* struct btrfs_dir_item */
674 BTRFS_SETGET_FUNCS(dir_data_len
, struct btrfs_dir_item
, data_len
, 16);
675 BTRFS_SETGET_FUNCS(dir_type
, struct btrfs_dir_item
, type
, 8);
676 BTRFS_SETGET_FUNCS(dir_name_len
, struct btrfs_dir_item
, name_len
, 16);
678 static inline void btrfs_dir_item_key(struct extent_buffer
*eb
,
679 struct btrfs_dir_item
*item
,
680 struct btrfs_disk_key
*key
)
682 read_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
685 static inline void btrfs_set_dir_item_key(struct extent_buffer
*eb
,
686 struct btrfs_dir_item
*item
,
687 struct btrfs_disk_key
*key
)
689 write_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
692 /* struct btrfs_disk_key */
693 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid
, struct btrfs_disk_key
,
695 BTRFS_SETGET_STACK_FUNCS(disk_key_offset
, struct btrfs_disk_key
, offset
, 64);
696 BTRFS_SETGET_STACK_FUNCS(disk_key_type
, struct btrfs_disk_key
, type
, 8);
698 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
699 struct btrfs_disk_key
*disk
)
701 cpu
->offset
= le64_to_cpu(disk
->offset
);
702 cpu
->type
= disk
->type
;
703 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
706 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
707 struct btrfs_key
*cpu
)
709 disk
->offset
= cpu_to_le64(cpu
->offset
);
710 disk
->type
= cpu
->type
;
711 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
714 static inline void btrfs_node_key_to_cpu(struct extent_buffer
*eb
,
715 struct btrfs_key
*key
, int nr
)
717 struct btrfs_disk_key disk_key
;
718 btrfs_node_key(eb
, &disk_key
, nr
);
719 btrfs_disk_key_to_cpu(key
, &disk_key
);
722 static inline void btrfs_item_key_to_cpu(struct extent_buffer
*eb
,
723 struct btrfs_key
*key
, int nr
)
725 struct btrfs_disk_key disk_key
;
726 btrfs_item_key(eb
, &disk_key
, nr
);
727 btrfs_disk_key_to_cpu(key
, &disk_key
);
730 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer
*eb
,
731 struct btrfs_dir_item
*item
,
732 struct btrfs_key
*key
)
734 struct btrfs_disk_key disk_key
;
735 btrfs_dir_item_key(eb
, item
, &disk_key
);
736 btrfs_disk_key_to_cpu(key
, &disk_key
);
740 static inline u8
btrfs_key_type(struct btrfs_key
*key
)
745 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u8 val
)
750 /* struct btrfs_header */
751 BTRFS_SETGET_HEADER_FUNCS(header_bytenr
, struct btrfs_header
, bytenr
, 64);
752 BTRFS_SETGET_HEADER_FUNCS(header_generation
, struct btrfs_header
,
754 BTRFS_SETGET_HEADER_FUNCS(header_owner
, struct btrfs_header
, owner
, 64);
755 BTRFS_SETGET_HEADER_FUNCS(header_nritems
, struct btrfs_header
, nritems
, 32);
756 BTRFS_SETGET_HEADER_FUNCS(header_flags
, struct btrfs_header
, flags
, 16);
757 BTRFS_SETGET_HEADER_FUNCS(header_level
, struct btrfs_header
, level
, 8);
759 static inline u8
*btrfs_header_fsid(struct extent_buffer
*eb
)
761 unsigned long ptr
= offsetof(struct btrfs_header
, fsid
);
765 static inline u8
*btrfs_super_fsid(struct extent_buffer
*eb
)
767 unsigned long ptr
= offsetof(struct btrfs_super_block
, fsid
);
771 static inline u8
*btrfs_header_csum(struct extent_buffer
*eb
)
773 unsigned long ptr
= offsetof(struct btrfs_header
, csum
);
777 static inline struct btrfs_node
*btrfs_buffer_node(struct extent_buffer
*eb
)
782 static inline struct btrfs_leaf
*btrfs_buffer_leaf(struct extent_buffer
*eb
)
787 static inline struct btrfs_header
*btrfs_buffer_header(struct extent_buffer
*eb
)
792 static inline int btrfs_is_leaf(struct extent_buffer
*eb
)
794 return (btrfs_header_level(eb
) == 0);
797 /* struct btrfs_root_item */
798 BTRFS_SETGET_FUNCS(disk_root_refs
, struct btrfs_root_item
, refs
, 32);
799 BTRFS_SETGET_FUNCS(disk_root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
800 BTRFS_SETGET_FUNCS(disk_root_level
, struct btrfs_root_item
, level
, 8);
802 BTRFS_SETGET_STACK_FUNCS(root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
803 BTRFS_SETGET_STACK_FUNCS(root_level
, struct btrfs_root_item
, level
, 8);
804 BTRFS_SETGET_STACK_FUNCS(root_dirid
, struct btrfs_root_item
, root_dirid
, 64);
805 BTRFS_SETGET_STACK_FUNCS(root_refs
, struct btrfs_root_item
, refs
, 32);
806 BTRFS_SETGET_STACK_FUNCS(root_flags
, struct btrfs_root_item
, flags
, 32);
807 BTRFS_SETGET_STACK_FUNCS(root_used
, struct btrfs_root_item
, bytes_used
, 64);
808 BTRFS_SETGET_STACK_FUNCS(root_limit
, struct btrfs_root_item
, byte_limit
, 64);
810 /* struct btrfs_super_block */
811 BTRFS_SETGET_STACK_FUNCS(super_bytenr
, struct btrfs_super_block
, bytenr
, 64);
812 BTRFS_SETGET_STACK_FUNCS(super_generation
, struct btrfs_super_block
,
814 BTRFS_SETGET_STACK_FUNCS(super_root
, struct btrfs_super_block
, root
, 64);
815 BTRFS_SETGET_STACK_FUNCS(super_root_level
, struct btrfs_super_block
,
817 BTRFS_SETGET_STACK_FUNCS(super_total_bytes
, struct btrfs_super_block
,
819 BTRFS_SETGET_STACK_FUNCS(super_bytes_used
, struct btrfs_super_block
,
821 BTRFS_SETGET_STACK_FUNCS(super_sectorsize
, struct btrfs_super_block
,
823 BTRFS_SETGET_STACK_FUNCS(super_nodesize
, struct btrfs_super_block
,
825 BTRFS_SETGET_STACK_FUNCS(super_leafsize
, struct btrfs_super_block
,
827 BTRFS_SETGET_STACK_FUNCS(super_stripesize
, struct btrfs_super_block
,
829 BTRFS_SETGET_STACK_FUNCS(super_root_dir
, struct btrfs_super_block
,
830 root_dir_objectid
, 64);
832 static inline unsigned long btrfs_leaf_data(struct extent_buffer
*l
)
834 return offsetof(struct btrfs_leaf
, items
);
837 /* struct btrfs_file_extent_item */
838 BTRFS_SETGET_FUNCS(file_extent_type
, struct btrfs_file_extent_item
, type
, 8);
840 static inline unsigned long btrfs_file_extent_inline_start(struct
841 btrfs_file_extent_item
*e
)
843 unsigned long offset
= (unsigned long)e
;
844 offset
+= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
848 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
850 return offsetof(struct btrfs_file_extent_item
, disk_bytenr
) + datasize
;
853 static inline u32
btrfs_file_extent_inline_len(struct extent_buffer
*eb
,
854 struct btrfs_item
*e
)
856 unsigned long offset
;
857 offset
= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
858 return btrfs_item_size(eb
, e
) - offset
;
861 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr
, struct btrfs_file_extent_item
,
863 BTRFS_SETGET_FUNCS(file_extent_generation
, struct btrfs_file_extent_item
,
865 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes
, struct btrfs_file_extent_item
,
867 BTRFS_SETGET_FUNCS(file_extent_offset
, struct btrfs_file_extent_item
,
869 BTRFS_SETGET_FUNCS(file_extent_num_bytes
, struct btrfs_file_extent_item
,
872 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
874 return sb
->s_fs_info
;
877 static inline int btrfs_set_root_name(struct btrfs_root
*root
,
878 const char *name
, int len
)
880 /* if we already have a name just free it */
884 root
->name
= kmalloc(len
+1, GFP_KERNEL
);
888 memcpy(root
->name
, name
, len
);
889 root
->name
[len
] ='\0';
894 static inline u32
btrfs_level_size(struct btrfs_root
*root
, int level
) {
896 return root
->leafsize
;
897 return root
->nodesize
;
900 /* helper function to cast into the data area of the leaf. */
901 #define btrfs_item_ptr(leaf, slot, type) \
902 ((type *)(btrfs_leaf_data(leaf) + \
903 btrfs_item_offset_nr(leaf, slot)))
905 #define btrfs_item_ptr_offset(leaf, slot) \
906 ((unsigned long)(btrfs_leaf_data(leaf) + \
907 btrfs_item_offset_nr(leaf, slot)))
909 /* mount option defines and helpers */
910 #define BTRFS_MOUNT_SUBVOL 0x000001
911 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
912 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
913 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
916 int btrfs_extent_post_op(struct btrfs_trans_handle
*trans
,
917 struct btrfs_root
*root
);
918 int btrfs_copy_pinned(struct btrfs_root
*root
, struct extent_map_tree
*copy
);
919 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
922 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
923 struct btrfs_block_group_cache
924 *hint
, u64 search_start
,
925 int data
, int owner
);
926 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
927 struct btrfs_root
*root
, u64 owner_objectid
);
928 struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
929 struct btrfs_root
*root
, u32 size
,
931 u64 hint
, u64 empty_size
);
932 struct extent_buffer
*__btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
933 struct btrfs_root
*root
,
941 int btrfs_insert_extent_backref(struct btrfs_trans_handle
*trans
,
942 struct btrfs_root
*root
,
943 struct btrfs_path
*path
, u64 bytenr
,
944 u64 root_objectid
, u64 ref_generation
,
945 u64 owner
, u64 owner_offset
);
946 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
947 struct btrfs_root
*root
,
948 u64 num_bytes
, u64 root_objectid
, u64 ref_generation
,
949 u64 owner
, u64 owner_offset
,
950 u64 empty_size
, u64 hint_byte
,
951 u64 search_end
, struct btrfs_key
*ins
, int data
);
952 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
953 struct extent_buffer
*buf
);
954 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
955 *root
, u64 bytenr
, u64 num_bytes
,
956 u64 root_objectid
, u64 ref_generation
,
957 u64 owner_objectid
, u64 owner_offset
, int pin
);
958 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
959 struct btrfs_root
*root
,
960 struct extent_map_tree
*unpin
);
961 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
962 struct btrfs_root
*root
,
963 u64 bytenr
, u64 num_bytes
,
964 u64 root_objectid
, u64 ref_generation
,
965 u64 owner
, u64 owner_offset
);
966 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
967 struct btrfs_root
*root
);
968 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
969 int btrfs_read_block_groups(struct btrfs_root
*root
);
971 int btrfs_cow_block(struct btrfs_trans_handle
*trans
,
972 struct btrfs_root
*root
, struct extent_buffer
*buf
,
973 struct extent_buffer
*parent
, int parent_slot
,
974 struct extent_buffer
**cow_ret
);
975 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
976 *root
, struct btrfs_path
*path
, u32 data_size
);
977 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
978 struct btrfs_root
*root
,
979 struct btrfs_path
*path
,
980 u32 new_size
, int from_end
);
981 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
982 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
984 int btrfs_realloc_node(struct btrfs_trans_handle
*trans
,
985 struct btrfs_root
*root
, struct extent_buffer
*parent
,
986 int start_slot
, int cache_only
, u64
*last_ret
,
987 struct btrfs_key
*progress
);
988 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
989 struct btrfs_path
*btrfs_alloc_path(void);
990 void btrfs_free_path(struct btrfs_path
*p
);
991 void btrfs_init_path(struct btrfs_path
*p
);
992 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
993 struct btrfs_path
*path
);
994 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
995 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
996 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
997 *root
, struct btrfs_path
*path
, struct btrfs_key
998 *cpu_key
, u32 data_size
);
999 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1000 int btrfs_prev_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1001 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct extent_buffer
*leaf
);
1002 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1005 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1006 struct btrfs_key
*key
);
1007 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1008 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1010 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1011 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1013 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1014 btrfs_root_item
*item
, struct btrfs_key
*key
);
1015 int btrfs_find_dead_roots(struct btrfs_root
*root
, u64 objectid
,
1016 struct btrfs_root
*latest_root
);
1018 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1019 *root
, const char *name
, int name_len
, u64 dir
,
1020 struct btrfs_key
*location
, u8 type
);
1021 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1022 struct btrfs_root
*root
,
1023 struct btrfs_path
*path
, u64 dir
,
1024 const char *name
, int name_len
,
1026 struct btrfs_dir_item
*
1027 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1028 struct btrfs_root
*root
,
1029 struct btrfs_path
*path
, u64 dir
,
1030 u64 objectid
, const char *name
, int name_len
,
1032 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1033 struct btrfs_path
*path
,
1034 const char *name
, int name_len
);
1035 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1036 struct btrfs_root
*root
,
1037 struct btrfs_path
*path
,
1038 struct btrfs_dir_item
*di
);
1039 int btrfs_insert_xattr_item(struct btrfs_trans_handle
*trans
,
1040 struct btrfs_root
*root
, const char *name
,
1041 u16 name_len
, const void *data
, u16 data_len
,
1043 struct btrfs_dir_item
*btrfs_lookup_xattr(struct btrfs_trans_handle
*trans
,
1044 struct btrfs_root
*root
,
1045 struct btrfs_path
*path
, u64 dir
,
1046 const char *name
, u16 name_len
,
1049 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1050 struct btrfs_root
*fs_root
,
1051 u64 dirid
, u64
*objectid
);
1052 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1055 int btrfs_insert_inode_ref(struct btrfs_trans_handle
*trans
,
1056 struct btrfs_root
*root
,
1057 const char *name
, int name_len
,
1058 u64 inode_objectid
, u64 ref_objectid
);
1059 int btrfs_del_inode_ref(struct btrfs_trans_handle
*trans
,
1060 struct btrfs_root
*root
,
1061 const char *name
, int name_len
,
1062 u64 inode_objectid
, u64 ref_objectid
);
1063 int btrfs_insert_empty_inode(struct btrfs_trans_handle
*trans
,
1064 struct btrfs_root
*root
,
1065 struct btrfs_path
*path
, u64 objectid
);
1066 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1067 *root
, struct btrfs_path
*path
,
1068 struct btrfs_key
*location
, int mod
);
1071 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1072 struct btrfs_root
*root
,
1073 u64 objectid
, u64 pos
, u64 offset
,
1076 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1077 struct btrfs_root
*root
,
1078 struct btrfs_path
*path
, u64 objectid
,
1079 u64 bytenr
, int mod
);
1080 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1081 struct btrfs_root
*root
,
1082 struct inode
*inode
,
1083 u64 objectid
, u64 offset
,
1084 char *data
, size_t len
);
1085 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1086 struct btrfs_root
*root
,
1087 struct btrfs_path
*path
,
1088 u64 objectid
, u64 offset
,
1090 int btrfs_csum_truncate(struct btrfs_trans_handle
*trans
,
1091 struct btrfs_root
*root
, struct btrfs_path
*path
,
1094 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1095 int btrfs_readpage(struct file
*file
, struct page
*page
);
1096 void btrfs_delete_inode(struct inode
*inode
);
1097 void btrfs_read_locked_inode(struct inode
*inode
);
1098 int btrfs_write_inode(struct inode
*inode
, int wait
);
1099 void btrfs_dirty_inode(struct inode
*inode
);
1100 struct inode
*btrfs_alloc_inode(struct super_block
*sb
);
1101 void btrfs_destroy_inode(struct inode
*inode
);
1102 int btrfs_init_cachep(void);
1103 void btrfs_destroy_cachep(void);
1104 long btrfs_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
1105 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1106 struct btrfs_root
*root
);
1107 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1108 unsigned from
, unsigned to
);
1109 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1110 size_t page_offset
, u64 start
, u64 end
,
1112 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
1113 struct btrfs_root
*root
,
1114 struct inode
*inode
);
1116 int btrfs_drop_extent_cache(struct inode
*inode
, u64 start
, u64 end
);
1117 extern struct file_operations btrfs_file_operations
;
1118 int btrfs_drop_extents(struct btrfs_trans_handle
*trans
,
1119 struct btrfs_root
*root
, struct inode
*inode
,
1120 u64 start
, u64 end
, u64 inline_limit
, u64
*hint_block
);
1122 int btrfs_defrag_leaves(struct btrfs_trans_handle
*trans
,
1123 struct btrfs_root
*root
, int cache_only
);
1126 int btrfs_init_sysfs(void);
1127 void btrfs_exit_sysfs(void);
1128 int btrfs_sysfs_add_super(struct btrfs_fs_info
*fs
);
1129 int btrfs_sysfs_add_root(struct btrfs_root
*root
);
1130 void btrfs_sysfs_del_root(struct btrfs_root
*root
);
1131 void btrfs_sysfs_del_super(struct btrfs_fs_info
*root
);
1134 ssize_t
btrfs_listxattr(struct dentry
*dentry
, char *buffer
, size_t size
);
1135 int btrfs_delete_xattrs(struct btrfs_trans_handle
*trans
,
1136 struct btrfs_root
*root
, struct inode
*inode
);