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_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_timespec
{
212 } __attribute__ ((__packed__
));
215 * there is no padding here on purpose. If you want to extent the inode,
216 * make a new item type
218 struct btrfs_inode_item
{
230 struct btrfs_inode_timespec atime
;
231 struct btrfs_inode_timespec ctime
;
232 struct btrfs_inode_timespec mtime
;
233 struct btrfs_inode_timespec otime
;
234 } __attribute__ ((__packed__
));
236 struct btrfs_dir_item
{
237 struct btrfs_disk_key location
;
241 } __attribute__ ((__packed__
));
243 struct btrfs_root_item
{
244 struct btrfs_inode_item inode
;
251 struct btrfs_disk_key drop_progress
;
254 } __attribute__ ((__packed__
));
256 #define BTRFS_FILE_EXTENT_REG 0
257 #define BTRFS_FILE_EXTENT_INLINE 1
259 struct btrfs_file_extent_item
{
263 * disk space consumed by the extent, checksum blocks are included
267 __le64 disk_num_bytes
;
269 * the logical offset in file blocks (no csums)
270 * this extent record is for. This allows a file extent to point
271 * into the middle of an existing extent on disk, sharing it
272 * between two snapshots (useful if some bytes in the middle of the
273 * extent have changed
277 * the logical number of file blocks (no csums included)
280 } __attribute__ ((__packed__
));
282 struct btrfs_csum_item
{
284 } __attribute__ ((__packed__
));
286 /* tag for the radix tree of block groups in ram */
287 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
290 #define BTRFS_BLOCK_GROUP_DATA 1
291 #define BTRFS_BLOCK_GROUP_MIXED 2
293 struct btrfs_block_group_item
{
296 } __attribute__ ((__packed__
));
298 struct btrfs_block_group_cache
{
299 struct btrfs_key key
;
300 struct btrfs_block_group_item item
;
305 struct btrfs_fs_info
{
306 u8 fsid
[BTRFS_FSID_SIZE
];
307 struct btrfs_root
*extent_root
;
308 struct btrfs_root
*tree_root
;
309 struct radix_tree_root fs_roots_radix
;
311 struct extent_map_tree free_space_cache
;
312 struct extent_map_tree block_group_cache
;
313 struct extent_map_tree pinned_extents
;
314 struct extent_map_tree pending_del
;
315 struct extent_map_tree extent_ins
;
318 u64 last_trans_committed
;
319 struct btrfs_transaction
*running_transaction
;
320 struct btrfs_super_block super_copy
;
321 struct extent_buffer
*sb_buffer
;
322 struct super_block
*sb
;
323 struct inode
*btree_inode
;
324 spinlock_t hash_lock
;
325 struct mutex trans_mutex
;
326 struct mutex fs_mutex
;
327 struct list_head trans_list
;
328 struct list_head hashers
;
329 struct list_head dead_roots
;
330 struct delayed_work trans_work
;
331 struct kobject super_kobj
;
332 struct completion kobj_unregister
;
339 * in ram representation of the tree. extent_root is used for all allocations
340 * and for the extent tree extent_root root.
343 struct extent_buffer
*node
;
344 struct extent_buffer
*commit_root
;
345 struct btrfs_root_item root_item
;
346 struct btrfs_key root_key
;
347 struct btrfs_fs_info
*fs_info
;
349 struct kobject root_kobj
;
350 struct completion kobj_unregister
;
351 struct rw_semaphore snap_sem
;
355 /* data allocations are done in sectorsize units */
358 /* node allocations are done in nodesize units */
361 /* leaf allocations are done in leafsize units */
368 u64 last_inode_alloc
;
370 struct btrfs_key defrag_progress
;
377 * inode items have the data typically returned from stat and store other
378 * info about object characteristics. There is one for every file and dir in
381 #define BTRFS_INODE_ITEM_KEY 1
382 #define BTRFS_XATTR_ITEM_KEY 2
383 /* reserve 2-15 close to the inode for later flexibility */
386 * dir items are the name -> inode pointers in a directory. There is one
387 * for every name in a directory.
389 #define BTRFS_DIR_ITEM_KEY 16
390 #define BTRFS_DIR_INDEX_KEY 17
392 * extent data is for file data
394 #define BTRFS_EXTENT_DATA_KEY 18
396 * csum items have the checksums for data in the extents
398 #define BTRFS_CSUM_ITEM_KEY 19
400 /* reserve 20-31 for other file stuff */
403 * root items point to tree roots. There are typically in the root
404 * tree used by the super block to find all the other trees
406 #define BTRFS_ROOT_ITEM_KEY 32
408 * extent items are in the extent map tree. These record which blocks
409 * are used, and how many references there are to each block
411 #define BTRFS_EXTENT_ITEM_KEY 33
412 #define BTRFS_EXTENT_REF_KEY 34
415 * block groups give us hints into the extent allocation trees. Which
416 * blocks are free etc etc
418 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
421 * string items are for debugging. They just store a short string of
424 #define BTRFS_STRING_ITEM_KEY 253
426 /* some macros to generate set/get funcs for the struct fields. This
427 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
430 #define le8_to_cpu(v) (v)
431 #define cpu_to_le8(v) (v)
434 #define read_eb_member(eb, ptr, type, member, result) ( \
435 read_extent_buffer(eb, (char *)(result), \
436 ((unsigned long)(ptr)) + \
437 offsetof(type, member), \
438 sizeof(((type *)0)->member)))
440 #define write_eb_member(eb, ptr, type, member, result) ( \
441 write_extent_buffer(eb, (char *)(result), \
442 ((unsigned long)(ptr)) + \
443 offsetof(type, member), \
444 sizeof(((type *)0)->member)))
446 #ifndef BTRFS_SETGET_FUNCS
447 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
448 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
449 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
452 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
453 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
455 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
456 unsigned long offset = offsetof(type, member); \
458 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
459 res = le##bits##_to_cpu(*tmp); \
460 kunmap_atomic(kaddr, KM_USER0); \
463 static inline void btrfs_set_##name(struct extent_buffer *eb, \
466 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
467 unsigned long offset = offsetof(type, member); \
468 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
469 *tmp = cpu_to_le##bits(val); \
470 kunmap_atomic(kaddr, KM_USER0); \
473 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
474 static inline u##bits btrfs_##name(type *s) \
476 return le##bits##_to_cpu(s->member); \
478 static inline void btrfs_set_##name(type *s, u##bits val) \
480 s->member = cpu_to_le##bits(val); \
483 /* struct btrfs_block_group_item */
484 BTRFS_SETGET_STACK_FUNCS(block_group_used
, struct btrfs_block_group_item
,
486 BTRFS_SETGET_FUNCS(disk_block_group_used
, struct btrfs_block_group_item
,
489 /* struct btrfs_inode_item */
490 BTRFS_SETGET_FUNCS(inode_generation
, struct btrfs_inode_item
, generation
, 64);
491 BTRFS_SETGET_FUNCS(inode_size
, struct btrfs_inode_item
, size
, 64);
492 BTRFS_SETGET_FUNCS(inode_nblocks
, struct btrfs_inode_item
, nblocks
, 64);
493 BTRFS_SETGET_FUNCS(inode_block_group
, struct btrfs_inode_item
, block_group
, 64);
494 BTRFS_SETGET_FUNCS(inode_nlink
, struct btrfs_inode_item
, nlink
, 32);
495 BTRFS_SETGET_FUNCS(inode_uid
, struct btrfs_inode_item
, uid
, 32);
496 BTRFS_SETGET_FUNCS(inode_gid
, struct btrfs_inode_item
, gid
, 32);
497 BTRFS_SETGET_FUNCS(inode_mode
, struct btrfs_inode_item
, mode
, 32);
498 BTRFS_SETGET_FUNCS(inode_rdev
, struct btrfs_inode_item
, rdev
, 32);
499 BTRFS_SETGET_FUNCS(inode_flags
, struct btrfs_inode_item
, flags
, 16);
500 BTRFS_SETGET_FUNCS(inode_compat_flags
, struct btrfs_inode_item
,
503 static inline struct btrfs_inode_timespec
*
504 btrfs_inode_atime(struct btrfs_inode_item
*inode_item
)
506 unsigned long ptr
= (unsigned long)inode_item
;
507 ptr
+= offsetof(struct btrfs_inode_item
, atime
);
508 return (struct btrfs_inode_timespec
*)ptr
;
511 static inline struct btrfs_inode_timespec
*
512 btrfs_inode_mtime(struct btrfs_inode_item
*inode_item
)
514 unsigned long ptr
= (unsigned long)inode_item
;
515 ptr
+= offsetof(struct btrfs_inode_item
, mtime
);
516 return (struct btrfs_inode_timespec
*)ptr
;
519 static inline struct btrfs_inode_timespec
*
520 btrfs_inode_ctime(struct btrfs_inode_item
*inode_item
)
522 unsigned long ptr
= (unsigned long)inode_item
;
523 ptr
+= offsetof(struct btrfs_inode_item
, ctime
);
524 return (struct btrfs_inode_timespec
*)ptr
;
527 static inline struct btrfs_inode_timespec
*
528 btrfs_inode_otime(struct btrfs_inode_item
*inode_item
)
530 unsigned long ptr
= (unsigned long)inode_item
;
531 ptr
+= offsetof(struct btrfs_inode_item
, otime
);
532 return (struct btrfs_inode_timespec
*)ptr
;
535 BTRFS_SETGET_FUNCS(timespec_sec
, struct btrfs_inode_timespec
, sec
, 64);
536 BTRFS_SETGET_FUNCS(timespec_nsec
, struct btrfs_inode_timespec
, nsec
, 32);
538 /* struct btrfs_extent_item */
539 BTRFS_SETGET_FUNCS(extent_refs
, struct btrfs_extent_item
, refs
, 32);
541 /* struct btrfs_extent_ref */
542 BTRFS_SETGET_FUNCS(ref_root
, struct btrfs_extent_ref
, root
, 64);
543 BTRFS_SETGET_FUNCS(ref_generation
, struct btrfs_extent_ref
, generation
, 64);
544 BTRFS_SETGET_FUNCS(ref_objectid
, struct btrfs_extent_ref
, objectid
, 64);
545 BTRFS_SETGET_FUNCS(ref_offset
, struct btrfs_extent_ref
, offset
, 64);
547 BTRFS_SETGET_STACK_FUNCS(ref_root
, struct btrfs_extent_ref
, root
, 64);
548 BTRFS_SETGET_STACK_FUNCS(ref_generation
, struct btrfs_extent_ref
,
550 BTRFS_SETGET_STACK_FUNCS(ref_objectid
, struct btrfs_extent_ref
, objectid
, 64);
551 BTRFS_SETGET_STACK_FUNCS(ref_offset
, struct btrfs_extent_ref
, offset
, 64);
553 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs
, struct btrfs_extent_item
,
556 /* struct btrfs_node */
557 BTRFS_SETGET_FUNCS(key_blockptr
, struct btrfs_key_ptr
, blockptr
, 64);
558 BTRFS_SETGET_FUNCS(key_generation
, struct btrfs_key_ptr
, generation
, 64);
560 static inline u64
btrfs_node_blockptr(struct extent_buffer
*eb
, int nr
)
563 ptr
= offsetof(struct btrfs_node
, ptrs
) +
564 sizeof(struct btrfs_key_ptr
) * nr
;
565 return btrfs_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
);
568 static inline void btrfs_set_node_blockptr(struct extent_buffer
*eb
,
572 ptr
= offsetof(struct btrfs_node
, ptrs
) +
573 sizeof(struct btrfs_key_ptr
) * nr
;
574 btrfs_set_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
577 static inline u64
btrfs_node_ptr_generation(struct extent_buffer
*eb
, int nr
)
580 ptr
= offsetof(struct btrfs_node
, ptrs
) +
581 sizeof(struct btrfs_key_ptr
) * nr
;
582 return btrfs_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
);
585 static inline void btrfs_set_node_ptr_generation(struct extent_buffer
*eb
,
589 ptr
= offsetof(struct btrfs_node
, ptrs
) +
590 sizeof(struct btrfs_key_ptr
) * nr
;
591 btrfs_set_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
594 static inline unsigned long btrfs_node_key_ptr_offset(int nr
)
596 return offsetof(struct btrfs_node
, ptrs
) +
597 sizeof(struct btrfs_key_ptr
) * nr
;
600 void btrfs_node_key(struct extent_buffer
*eb
,
601 struct btrfs_disk_key
*disk_key
, int nr
);
603 static inline void btrfs_set_node_key(struct extent_buffer
*eb
,
604 struct btrfs_disk_key
*disk_key
, int nr
)
607 ptr
= btrfs_node_key_ptr_offset(nr
);
608 write_eb_member(eb
, (struct btrfs_key_ptr
*)ptr
,
609 struct btrfs_key_ptr
, key
, disk_key
);
612 /* struct btrfs_item */
613 BTRFS_SETGET_FUNCS(item_offset
, struct btrfs_item
, offset
, 32);
614 BTRFS_SETGET_FUNCS(item_size
, struct btrfs_item
, size
, 32);
616 static inline unsigned long btrfs_item_nr_offset(int nr
)
618 return offsetof(struct btrfs_leaf
, items
) +
619 sizeof(struct btrfs_item
) * nr
;
622 static inline struct btrfs_item
*btrfs_item_nr(struct extent_buffer
*eb
,
625 return (struct btrfs_item
*)btrfs_item_nr_offset(nr
);
628 static inline u32
btrfs_item_end(struct extent_buffer
*eb
,
629 struct btrfs_item
*item
)
631 return btrfs_item_offset(eb
, item
) + btrfs_item_size(eb
, item
);
634 static inline u32
btrfs_item_end_nr(struct extent_buffer
*eb
, int nr
)
636 return btrfs_item_end(eb
, btrfs_item_nr(eb
, nr
));
639 static inline u32
btrfs_item_offset_nr(struct extent_buffer
*eb
, int nr
)
641 return btrfs_item_offset(eb
, btrfs_item_nr(eb
, nr
));
644 static inline u32
btrfs_item_size_nr(struct extent_buffer
*eb
, int nr
)
646 return btrfs_item_size(eb
, btrfs_item_nr(eb
, nr
));
649 static inline void btrfs_item_key(struct extent_buffer
*eb
,
650 struct btrfs_disk_key
*disk_key
, int nr
)
652 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
653 read_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
656 static inline void btrfs_set_item_key(struct extent_buffer
*eb
,
657 struct btrfs_disk_key
*disk_key
, int nr
)
659 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
660 write_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
663 /* struct btrfs_dir_item */
664 BTRFS_SETGET_FUNCS(dir_data_len
, struct btrfs_dir_item
, data_len
, 16);
665 BTRFS_SETGET_FUNCS(dir_type
, struct btrfs_dir_item
, type
, 8);
666 BTRFS_SETGET_FUNCS(dir_name_len
, struct btrfs_dir_item
, name_len
, 16);
668 static inline void btrfs_dir_item_key(struct extent_buffer
*eb
,
669 struct btrfs_dir_item
*item
,
670 struct btrfs_disk_key
*key
)
672 read_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
675 static inline void btrfs_set_dir_item_key(struct extent_buffer
*eb
,
676 struct btrfs_dir_item
*item
,
677 struct btrfs_disk_key
*key
)
679 write_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
682 /* struct btrfs_disk_key */
683 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid
, struct btrfs_disk_key
,
685 BTRFS_SETGET_STACK_FUNCS(disk_key_offset
, struct btrfs_disk_key
, offset
, 64);
686 BTRFS_SETGET_STACK_FUNCS(disk_key_type
, struct btrfs_disk_key
, type
, 8);
688 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
689 struct btrfs_disk_key
*disk
)
691 cpu
->offset
= le64_to_cpu(disk
->offset
);
692 cpu
->type
= disk
->type
;
693 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
696 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
697 struct btrfs_key
*cpu
)
699 disk
->offset
= cpu_to_le64(cpu
->offset
);
700 disk
->type
= cpu
->type
;
701 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
704 static inline void btrfs_node_key_to_cpu(struct extent_buffer
*eb
,
705 struct btrfs_key
*key
, int nr
)
707 struct btrfs_disk_key disk_key
;
708 btrfs_node_key(eb
, &disk_key
, nr
);
709 btrfs_disk_key_to_cpu(key
, &disk_key
);
712 static inline void btrfs_item_key_to_cpu(struct extent_buffer
*eb
,
713 struct btrfs_key
*key
, int nr
)
715 struct btrfs_disk_key disk_key
;
716 btrfs_item_key(eb
, &disk_key
, nr
);
717 btrfs_disk_key_to_cpu(key
, &disk_key
);
720 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer
*eb
,
721 struct btrfs_dir_item
*item
,
722 struct btrfs_key
*key
)
724 struct btrfs_disk_key disk_key
;
725 btrfs_dir_item_key(eb
, item
, &disk_key
);
726 btrfs_disk_key_to_cpu(key
, &disk_key
);
730 static inline u8
btrfs_key_type(struct btrfs_key
*key
)
735 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u8 val
)
740 /* struct btrfs_header */
741 BTRFS_SETGET_HEADER_FUNCS(header_bytenr
, struct btrfs_header
, bytenr
, 64);
742 BTRFS_SETGET_HEADER_FUNCS(header_generation
, struct btrfs_header
,
744 BTRFS_SETGET_HEADER_FUNCS(header_owner
, struct btrfs_header
, owner
, 64);
745 BTRFS_SETGET_HEADER_FUNCS(header_nritems
, struct btrfs_header
, nritems
, 32);
746 BTRFS_SETGET_HEADER_FUNCS(header_flags
, struct btrfs_header
, flags
, 16);
747 BTRFS_SETGET_HEADER_FUNCS(header_level
, struct btrfs_header
, level
, 8);
749 static inline u8
*btrfs_header_fsid(struct extent_buffer
*eb
)
751 unsigned long ptr
= offsetof(struct btrfs_header
, fsid
);
755 static inline u8
*btrfs_super_fsid(struct extent_buffer
*eb
)
757 unsigned long ptr
= offsetof(struct btrfs_super_block
, fsid
);
761 static inline u8
*btrfs_header_csum(struct extent_buffer
*eb
)
763 unsigned long ptr
= offsetof(struct btrfs_header
, csum
);
767 static inline struct btrfs_node
*btrfs_buffer_node(struct extent_buffer
*eb
)
772 static inline struct btrfs_leaf
*btrfs_buffer_leaf(struct extent_buffer
*eb
)
777 static inline struct btrfs_header
*btrfs_buffer_header(struct extent_buffer
*eb
)
782 static inline int btrfs_is_leaf(struct extent_buffer
*eb
)
784 return (btrfs_header_level(eb
) == 0);
787 /* struct btrfs_root_item */
788 BTRFS_SETGET_FUNCS(disk_root_refs
, struct btrfs_root_item
, refs
, 32);
789 BTRFS_SETGET_FUNCS(disk_root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
790 BTRFS_SETGET_FUNCS(disk_root_level
, struct btrfs_root_item
, level
, 8);
792 BTRFS_SETGET_STACK_FUNCS(root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
793 BTRFS_SETGET_STACK_FUNCS(root_level
, struct btrfs_root_item
, level
, 8);
794 BTRFS_SETGET_STACK_FUNCS(root_dirid
, struct btrfs_root_item
, root_dirid
, 64);
795 BTRFS_SETGET_STACK_FUNCS(root_refs
, struct btrfs_root_item
, refs
, 32);
796 BTRFS_SETGET_STACK_FUNCS(root_flags
, struct btrfs_root_item
, flags
, 32);
797 BTRFS_SETGET_STACK_FUNCS(root_used
, struct btrfs_root_item
, bytes_used
, 64);
798 BTRFS_SETGET_STACK_FUNCS(root_limit
, struct btrfs_root_item
, byte_limit
, 64);
800 /* struct btrfs_super_block */
801 BTRFS_SETGET_STACK_FUNCS(super_bytenr
, struct btrfs_super_block
, bytenr
, 64);
802 BTRFS_SETGET_STACK_FUNCS(super_generation
, struct btrfs_super_block
,
804 BTRFS_SETGET_STACK_FUNCS(super_root
, struct btrfs_super_block
, root
, 64);
805 BTRFS_SETGET_STACK_FUNCS(super_root_level
, struct btrfs_super_block
,
807 BTRFS_SETGET_STACK_FUNCS(super_total_bytes
, struct btrfs_super_block
,
809 BTRFS_SETGET_STACK_FUNCS(super_bytes_used
, struct btrfs_super_block
,
811 BTRFS_SETGET_STACK_FUNCS(super_sectorsize
, struct btrfs_super_block
,
813 BTRFS_SETGET_STACK_FUNCS(super_nodesize
, struct btrfs_super_block
,
815 BTRFS_SETGET_STACK_FUNCS(super_leafsize
, struct btrfs_super_block
,
817 BTRFS_SETGET_STACK_FUNCS(super_stripesize
, struct btrfs_super_block
,
819 BTRFS_SETGET_STACK_FUNCS(super_root_dir
, struct btrfs_super_block
,
820 root_dir_objectid
, 64);
822 static inline unsigned long btrfs_leaf_data(struct extent_buffer
*l
)
824 return offsetof(struct btrfs_leaf
, items
);
827 /* struct btrfs_file_extent_item */
828 BTRFS_SETGET_FUNCS(file_extent_type
, struct btrfs_file_extent_item
, type
, 8);
830 static inline unsigned long btrfs_file_extent_inline_start(struct
831 btrfs_file_extent_item
*e
)
833 unsigned long offset
= (unsigned long)e
;
834 offset
+= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
838 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
840 return offsetof(struct btrfs_file_extent_item
, disk_bytenr
) + datasize
;
843 static inline u32
btrfs_file_extent_inline_len(struct extent_buffer
*eb
,
844 struct btrfs_item
*e
)
846 unsigned long offset
;
847 offset
= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
848 return btrfs_item_size(eb
, e
) - offset
;
851 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr
, struct btrfs_file_extent_item
,
853 BTRFS_SETGET_FUNCS(file_extent_generation
, struct btrfs_file_extent_item
,
855 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes
, struct btrfs_file_extent_item
,
857 BTRFS_SETGET_FUNCS(file_extent_offset
, struct btrfs_file_extent_item
,
859 BTRFS_SETGET_FUNCS(file_extent_num_bytes
, struct btrfs_file_extent_item
,
862 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
864 return sb
->s_fs_info
;
867 static inline int btrfs_set_root_name(struct btrfs_root
*root
,
868 const char *name
, int len
)
870 /* if we already have a name just free it */
874 root
->name
= kmalloc(len
+1, GFP_KERNEL
);
878 memcpy(root
->name
, name
, len
);
879 root
->name
[len
] ='\0';
884 static inline u32
btrfs_level_size(struct btrfs_root
*root
, int level
) {
886 return root
->leafsize
;
887 return root
->nodesize
;
890 /* helper function to cast into the data area of the leaf. */
891 #define btrfs_item_ptr(leaf, slot, type) \
892 ((type *)(btrfs_leaf_data(leaf) + \
893 btrfs_item_offset_nr(leaf, slot)))
895 #define btrfs_item_ptr_offset(leaf, slot) \
896 ((unsigned long)(btrfs_leaf_data(leaf) + \
897 btrfs_item_offset_nr(leaf, slot)))
899 /* mount option defines and helpers */
900 #define BTRFS_MOUNT_SUBVOL 0x000001
901 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
902 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
903 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
906 int btrfs_extent_post_op(struct btrfs_trans_handle
*trans
,
907 struct btrfs_root
*root
);
908 int btrfs_copy_pinned(struct btrfs_root
*root
, struct extent_map_tree
*copy
);
909 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
912 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
913 struct btrfs_block_group_cache
914 *hint
, u64 search_start
,
915 int data
, int owner
);
916 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
917 struct btrfs_root
*root
);
918 struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
919 struct btrfs_root
*root
, u32 size
,
920 u64 hint
, u64 empty_size
);
921 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
922 struct btrfs_root
*root
, u64 owner
,
923 u64 num_bytes
, u64 empty_size
, u64 search_start
,
924 u64 search_end
, struct btrfs_key
*ins
, int data
);
925 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
926 struct extent_buffer
*buf
);
927 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
928 *root
, u64 bytenr
, u64 num_bytes
, int pin
);
929 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
930 struct btrfs_root
*root
,
931 struct extent_map_tree
*unpin
);
932 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
933 struct btrfs_root
*root
,
934 u64 bytenr
, u64 num_bytes
);
935 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
936 struct btrfs_root
*root
);
937 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
938 int btrfs_read_block_groups(struct btrfs_root
*root
);
940 int btrfs_cow_block(struct btrfs_trans_handle
*trans
,
941 struct btrfs_root
*root
, struct extent_buffer
*buf
,
942 struct extent_buffer
*parent
, int parent_slot
,
943 struct extent_buffer
**cow_ret
);
944 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
945 *root
, struct btrfs_path
*path
, u32 data_size
);
946 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
947 struct btrfs_root
*root
,
948 struct btrfs_path
*path
,
949 u32 new_size
, int from_end
);
950 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
951 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
953 int btrfs_realloc_node(struct btrfs_trans_handle
*trans
,
954 struct btrfs_root
*root
, struct extent_buffer
*parent
,
955 int start_slot
, int cache_only
, u64
*last_ret
,
956 struct btrfs_key
*progress
);
957 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
958 struct btrfs_path
*btrfs_alloc_path(void);
959 void btrfs_free_path(struct btrfs_path
*p
);
960 void btrfs_init_path(struct btrfs_path
*p
);
961 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
962 struct btrfs_path
*path
);
963 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
964 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
965 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
966 *root
, struct btrfs_path
*path
, struct btrfs_key
967 *cpu_key
, u32 data_size
);
968 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
969 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct extent_buffer
*leaf
);
970 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
973 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
974 struct btrfs_key
*key
);
975 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
976 *root
, struct btrfs_key
*key
, struct btrfs_root_item
978 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
979 *root
, struct btrfs_key
*key
, struct btrfs_root_item
981 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
982 btrfs_root_item
*item
, struct btrfs_key
*key
);
983 int btrfs_find_dead_roots(struct btrfs_root
*root
, u64 objectid
,
984 struct btrfs_root
*latest_root
);
986 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
987 *root
, const char *name
, int name_len
, u64 dir
,
988 struct btrfs_key
*location
, u8 type
);
989 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
990 struct btrfs_root
*root
,
991 struct btrfs_path
*path
, u64 dir
,
992 const char *name
, int name_len
,
994 struct btrfs_dir_item
*
995 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
996 struct btrfs_root
*root
,
997 struct btrfs_path
*path
, u64 dir
,
998 u64 objectid
, const char *name
, int name_len
,
1000 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1001 struct btrfs_path
*path
,
1002 const char *name
, int name_len
);
1003 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1004 struct btrfs_root
*root
,
1005 struct btrfs_path
*path
,
1006 struct btrfs_dir_item
*di
);
1007 int btrfs_insert_xattr_item(struct btrfs_trans_handle
*trans
,
1008 struct btrfs_root
*root
, const char *name
,
1009 u16 name_len
, const void *data
, u16 data_len
,
1011 struct btrfs_dir_item
*btrfs_lookup_xattr(struct btrfs_trans_handle
*trans
,
1012 struct btrfs_root
*root
,
1013 struct btrfs_path
*path
, u64 dir
,
1014 const char *name
, u16 name_len
,
1017 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1018 struct btrfs_root
*fs_root
,
1019 u64 dirid
, u64
*objectid
);
1020 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1023 int btrfs_insert_empty_inode(struct btrfs_trans_handle
*trans
,
1024 struct btrfs_root
*root
,
1025 struct btrfs_path
*path
, u64 objectid
);
1026 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1027 *root
, struct btrfs_path
*path
,
1028 struct btrfs_key
*location
, int mod
);
1031 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1032 struct btrfs_root
*root
,
1033 u64 objectid
, u64 pos
, u64 offset
,
1036 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1037 struct btrfs_root
*root
,
1038 struct btrfs_path
*path
, u64 objectid
,
1039 u64 bytenr
, int mod
);
1040 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1041 struct btrfs_root
*root
,
1042 struct inode
*inode
,
1043 u64 objectid
, u64 offset
,
1044 char *data
, size_t len
);
1045 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1046 struct btrfs_root
*root
,
1047 struct btrfs_path
*path
,
1048 u64 objectid
, u64 offset
,
1050 int btrfs_csum_truncate(struct btrfs_trans_handle
*trans
,
1051 struct btrfs_root
*root
, struct btrfs_path
*path
,
1054 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1055 int btrfs_readpage(struct file
*file
, struct page
*page
);
1056 void btrfs_delete_inode(struct inode
*inode
);
1057 void btrfs_read_locked_inode(struct inode
*inode
);
1058 int btrfs_write_inode(struct inode
*inode
, int wait
);
1059 void btrfs_dirty_inode(struct inode
*inode
);
1060 struct inode
*btrfs_alloc_inode(struct super_block
*sb
);
1061 void btrfs_destroy_inode(struct inode
*inode
);
1062 int btrfs_init_cachep(void);
1063 void btrfs_destroy_cachep(void);
1064 long btrfs_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
1065 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1066 struct btrfs_root
*root
);
1067 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1068 unsigned from
, unsigned to
);
1069 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1070 size_t page_offset
, u64 start
, u64 end
,
1072 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
1073 struct btrfs_root
*root
,
1074 struct inode
*inode
);
1076 int btrfs_drop_extent_cache(struct inode
*inode
, u64 start
, u64 end
);
1077 extern struct file_operations btrfs_file_operations
;
1078 int btrfs_drop_extents(struct btrfs_trans_handle
*trans
,
1079 struct btrfs_root
*root
, struct inode
*inode
,
1080 u64 start
, u64 end
, u64 inline_limit
, u64
*hint_block
);
1082 int btrfs_defrag_leaves(struct btrfs_trans_handle
*trans
,
1083 struct btrfs_root
*root
, int cache_only
);
1086 int btrfs_init_sysfs(void);
1087 void btrfs_exit_sysfs(void);
1088 int btrfs_sysfs_add_super(struct btrfs_fs_info
*fs
);
1089 int btrfs_sysfs_add_root(struct btrfs_root
*root
);
1090 void btrfs_sysfs_del_root(struct btrfs_root
*root
);
1091 void btrfs_sysfs_del_super(struct btrfs_fs_info
*root
);
1094 ssize_t
btrfs_listxattr(struct dentry
*dentry
, char *buffer
, size_t size
);
1095 int btrfs_delete_xattrs(struct btrfs_trans_handle
*trans
,
1096 struct btrfs_root
*root
, struct inode
*inode
);