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.
22 #include <linux/version.h>
24 #include <linux/highmem.h>
26 #include <linux/workqueue.h>
27 #include <linux/completion.h>
28 #include <asm/kmap_types.h>
29 #include "bit-radix.h"
30 #include "extent_map.h"
32 struct btrfs_trans_handle
;
33 struct btrfs_transaction
;
34 extern struct kmem_cache
*btrfs_trans_handle_cachep
;
35 extern struct kmem_cache
*btrfs_transaction_cachep
;
36 extern struct kmem_cache
*btrfs_bit_radix_cachep
;
37 extern struct kmem_cache
*btrfs_path_cachep
;
39 #define BTRFS_MAGIC "_B2RfS_M"
41 #define BTRFS_MAX_LEVEL 8
42 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
43 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
44 #define BTRFS_FS_TREE_OBJECTID 3ULL
45 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
46 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
49 * we can actually store much bigger names, but lets not confuse the rest
52 #define BTRFS_NAME_LEN 255
54 /* 32 bytes in various csum fields */
55 #define BTRFS_CSUM_SIZE 32
56 /* four bytes for CRC32 */
57 #define BTRFS_CRC32_SIZE 4
58 #define BTRFS_EMPTY_DIR_SIZE 0
60 #define BTRFS_FT_UNKNOWN 0
61 #define BTRFS_FT_REG_FILE 1
62 #define BTRFS_FT_DIR 2
63 #define BTRFS_FT_CHRDEV 3
64 #define BTRFS_FT_BLKDEV 4
65 #define BTRFS_FT_FIFO 5
66 #define BTRFS_FT_SOCK 6
67 #define BTRFS_FT_SYMLINK 7
68 #define BTRFS_FT_XATTR 8
69 #define BTRFS_FT_MAX 9
72 * the key defines the order in the tree, and so it also defines (optimal)
73 * block layout. objectid corresonds to the inode number. The flags
74 * tells us things about the object, and is a kind of stream selector.
75 * so for a given inode, keys with flags of 1 might refer to the inode
76 * data, flags of 2 may point to file data in the btree and flags == 3
77 * may point to extents.
79 * offset is the starting byte offset for this key in the stream.
81 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
82 * in cpu native order. Otherwise they are identical and their sizes
83 * should be the same (ie both packed)
85 struct btrfs_disk_key
{
89 } __attribute__ ((__packed__
));
95 } __attribute__ ((__packed__
));
97 #define BTRFS_FSID_SIZE 16
99 * every tree block (leaf or node) starts with this header.
101 struct btrfs_header
{
102 u8 csum
[BTRFS_CSUM_SIZE
];
103 u8 fsid
[BTRFS_FSID_SIZE
]; /* FS specific uuid */
104 __le64 bytenr
; /* which block this node is supposed to live in */
110 } __attribute__ ((__packed__
));
112 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
113 sizeof(struct btrfs_header)) / \
114 sizeof(struct btrfs_key_ptr))
115 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
116 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
117 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
118 sizeof(struct btrfs_item) - \
119 sizeof(struct btrfs_file_extent_item))
122 * the super block basically lists the main trees of the FS
123 * it currently lacks any block count etc etc
125 struct btrfs_super_block
{
126 u8 csum
[BTRFS_CSUM_SIZE
];
127 /* the first 3 fields must match struct btrfs_header */
128 u8 fsid
[16]; /* FS specific uuid */
129 __le64 bytenr
; /* this block number */
135 __le64 root_dir_objectid
;
141 } __attribute__ ((__packed__
));
144 * A leaf is full of items. offset and size tell us where to find
145 * the item in the leaf (relative to the start of the data area)
148 struct btrfs_disk_key key
;
151 } __attribute__ ((__packed__
));
154 * leaves have an item area and a data area:
155 * [item0, item1....itemN] [free space] [dataN...data1, data0]
157 * The data is separate from the items to get the keys closer together
161 struct btrfs_header header
;
162 struct btrfs_item items
[];
163 } __attribute__ ((__packed__
));
166 * all non-leaf blocks are nodes, they hold only keys and pointers to
169 struct btrfs_key_ptr
{
170 struct btrfs_disk_key key
;
173 } __attribute__ ((__packed__
));
176 struct btrfs_header header
;
177 struct btrfs_key_ptr ptrs
[];
178 } __attribute__ ((__packed__
));
181 * btrfs_paths remember the path taken from the root down to the leaf.
182 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
183 * to any other levels that are present.
185 * The slots array records the index of the item or block pointer
186 * used while walking the tree.
189 struct extent_buffer
*nodes
[BTRFS_MAX_LEVEL
];
190 int slots
[BTRFS_MAX_LEVEL
];
196 * items in the extent btree are used to record the objectid of the
197 * owner of the block and the number of references
199 struct btrfs_extent_item
{
201 } __attribute__ ((__packed__
));
203 struct btrfs_extent_ref
{
208 } __attribute__ ((__packed__
));
210 struct btrfs_inode_ref
{
213 } __attribute__ ((__packed__
));
215 struct btrfs_inode_timespec
{
218 } __attribute__ ((__packed__
));
221 * there is no padding here on purpose. If you want to extent the inode,
222 * make a new item type
224 struct btrfs_inode_item
{
236 struct btrfs_inode_timespec atime
;
237 struct btrfs_inode_timespec ctime
;
238 struct btrfs_inode_timespec mtime
;
239 struct btrfs_inode_timespec otime
;
240 } __attribute__ ((__packed__
));
242 struct btrfs_dir_item
{
243 struct btrfs_disk_key location
;
247 } __attribute__ ((__packed__
));
249 struct btrfs_root_item
{
250 struct btrfs_inode_item inode
;
257 struct btrfs_disk_key drop_progress
;
260 } __attribute__ ((__packed__
));
262 #define BTRFS_FILE_EXTENT_REG 0
263 #define BTRFS_FILE_EXTENT_INLINE 1
265 struct btrfs_file_extent_item
{
269 * disk space consumed by the extent, checksum blocks are included
273 __le64 disk_num_bytes
;
275 * the logical offset in file blocks (no csums)
276 * this extent record is for. This allows a file extent to point
277 * into the middle of an existing extent on disk, sharing it
278 * between two snapshots (useful if some bytes in the middle of the
279 * extent have changed
283 * the logical number of file blocks (no csums included)
286 } __attribute__ ((__packed__
));
288 struct btrfs_csum_item
{
290 } __attribute__ ((__packed__
));
292 /* tag for the radix tree of block groups in ram */
293 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
296 #define BTRFS_BLOCK_GROUP_DATA 1
297 #define BTRFS_BLOCK_GROUP_MIXED 2
299 struct btrfs_block_group_item
{
302 } __attribute__ ((__packed__
));
304 struct btrfs_block_group_cache
{
305 struct btrfs_key key
;
306 struct btrfs_block_group_item item
;
311 struct btrfs_fs_info
{
312 u8 fsid
[BTRFS_FSID_SIZE
];
313 struct btrfs_root
*extent_root
;
314 struct btrfs_root
*tree_root
;
315 struct radix_tree_root fs_roots_radix
;
317 struct extent_map_tree free_space_cache
;
318 struct extent_map_tree block_group_cache
;
319 struct extent_map_tree pinned_extents
;
320 struct extent_map_tree pending_del
;
321 struct extent_map_tree extent_ins
;
324 u64 last_trans_committed
;
325 unsigned long mount_opt
;
328 struct btrfs_transaction
*running_transaction
;
329 struct btrfs_super_block super_copy
;
330 struct extent_buffer
*sb_buffer
;
331 struct super_block
*sb
;
332 struct inode
*btree_inode
;
333 spinlock_t hash_lock
;
334 struct mutex trans_mutex
;
335 struct mutex fs_mutex
;
336 struct list_head trans_list
;
337 struct list_head hashers
;
338 struct list_head dead_roots
;
339 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
340 struct work_struct trans_work
;
342 struct delayed_work trans_work
;
344 struct kobject super_kobj
;
345 struct completion kobj_unregister
;
350 spinlock_t delalloc_lock
;
354 * in ram representation of the tree. extent_root is used for all allocations
355 * and for the extent tree extent_root root.
358 struct extent_buffer
*node
;
359 struct extent_buffer
*commit_root
;
360 struct btrfs_root_item root_item
;
361 struct btrfs_key root_key
;
362 struct btrfs_fs_info
*fs_info
;
364 struct kobject root_kobj
;
365 struct completion kobj_unregister
;
366 struct rw_semaphore snap_sem
;
370 /* data allocations are done in sectorsize units */
373 /* node allocations are done in nodesize units */
376 /* leaf allocations are done in leafsize units */
383 u64 last_inode_alloc
;
385 struct btrfs_key defrag_progress
;
393 * inode items have the data typically returned from stat and store other
394 * info about object characteristics. There is one for every file and dir in
397 #define BTRFS_INODE_ITEM_KEY 1
398 #define BTRFS_INODE_REF_KEY 2
399 #define BTRFS_XATTR_ITEM_KEY 8
400 /* reserve 2-15 close to the inode for later flexibility */
403 * dir items are the name -> inode pointers in a directory. There is one
404 * for every name in a directory.
406 #define BTRFS_DIR_ITEM_KEY 16
407 #define BTRFS_DIR_INDEX_KEY 17
409 * extent data is for file data
411 #define BTRFS_EXTENT_DATA_KEY 18
413 * csum items have the checksums for data in the extents
415 #define BTRFS_CSUM_ITEM_KEY 19
417 /* reserve 20-31 for other file stuff */
420 * root items point to tree roots. There are typically in the root
421 * tree used by the super block to find all the other trees
423 #define BTRFS_ROOT_ITEM_KEY 32
425 * extent items are in the extent map tree. These record which blocks
426 * are used, and how many references there are to each block
428 #define BTRFS_EXTENT_ITEM_KEY 33
429 #define BTRFS_EXTENT_REF_KEY 34
432 * block groups give us hints into the extent allocation trees. Which
433 * blocks are free etc etc
435 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
438 * string items are for debugging. They just store a short string of
441 #define BTRFS_STRING_ITEM_KEY 253
443 #define BTRFS_MOUNT_NODATASUM 0x1
444 #define BTRFS_MOUNT_NODATACOW 0x2
446 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
447 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
448 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
451 /* some macros to generate set/get funcs for the struct fields. This
452 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
455 #define le8_to_cpu(v) (v)
456 #define cpu_to_le8(v) (v)
459 #define read_eb_member(eb, ptr, type, member, result) ( \
460 read_extent_buffer(eb, (char *)(result), \
461 ((unsigned long)(ptr)) + \
462 offsetof(type, member), \
463 sizeof(((type *)0)->member)))
465 #define write_eb_member(eb, ptr, type, member, result) ( \
466 write_extent_buffer(eb, (char *)(result), \
467 ((unsigned long)(ptr)) + \
468 offsetof(type, member), \
469 sizeof(((type *)0)->member)))
471 #ifndef BTRFS_SETGET_FUNCS
472 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
473 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
474 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
477 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
478 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
480 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
481 unsigned long offset = offsetof(type, member); \
483 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
484 res = le##bits##_to_cpu(*tmp); \
485 kunmap_atomic(kaddr, KM_USER0); \
488 static inline void btrfs_set_##name(struct extent_buffer *eb, \
491 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
492 unsigned long offset = offsetof(type, member); \
493 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
494 *tmp = cpu_to_le##bits(val); \
495 kunmap_atomic(kaddr, KM_USER0); \
498 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
499 static inline u##bits btrfs_##name(type *s) \
501 return le##bits##_to_cpu(s->member); \
503 static inline void btrfs_set_##name(type *s, u##bits val) \
505 s->member = cpu_to_le##bits(val); \
508 /* struct btrfs_block_group_item */
509 BTRFS_SETGET_STACK_FUNCS(block_group_used
, struct btrfs_block_group_item
,
511 BTRFS_SETGET_FUNCS(disk_block_group_used
, struct btrfs_block_group_item
,
513 BTRFS_SETGET_FUNCS(disk_block_group_flags
, struct btrfs_block_group_item
,
516 /* struct btrfs_inode_ref */
517 BTRFS_SETGET_FUNCS(inode_ref_name_len
, struct btrfs_inode_ref
, name_len
, 16);
519 /* struct btrfs_inode_item */
520 BTRFS_SETGET_FUNCS(inode_generation
, struct btrfs_inode_item
, generation
, 64);
521 BTRFS_SETGET_FUNCS(inode_size
, struct btrfs_inode_item
, size
, 64);
522 BTRFS_SETGET_FUNCS(inode_nblocks
, struct btrfs_inode_item
, nblocks
, 64);
523 BTRFS_SETGET_FUNCS(inode_block_group
, struct btrfs_inode_item
, block_group
, 64);
524 BTRFS_SETGET_FUNCS(inode_nlink
, struct btrfs_inode_item
, nlink
, 32);
525 BTRFS_SETGET_FUNCS(inode_uid
, struct btrfs_inode_item
, uid
, 32);
526 BTRFS_SETGET_FUNCS(inode_gid
, struct btrfs_inode_item
, gid
, 32);
527 BTRFS_SETGET_FUNCS(inode_mode
, struct btrfs_inode_item
, mode
, 32);
528 BTRFS_SETGET_FUNCS(inode_rdev
, struct btrfs_inode_item
, rdev
, 32);
529 BTRFS_SETGET_FUNCS(inode_flags
, struct btrfs_inode_item
, flags
, 16);
530 BTRFS_SETGET_FUNCS(inode_compat_flags
, struct btrfs_inode_item
,
533 static inline struct btrfs_inode_timespec
*
534 btrfs_inode_atime(struct btrfs_inode_item
*inode_item
)
536 unsigned long ptr
= (unsigned long)inode_item
;
537 ptr
+= offsetof(struct btrfs_inode_item
, atime
);
538 return (struct btrfs_inode_timespec
*)ptr
;
541 static inline struct btrfs_inode_timespec
*
542 btrfs_inode_mtime(struct btrfs_inode_item
*inode_item
)
544 unsigned long ptr
= (unsigned long)inode_item
;
545 ptr
+= offsetof(struct btrfs_inode_item
, mtime
);
546 return (struct btrfs_inode_timespec
*)ptr
;
549 static inline struct btrfs_inode_timespec
*
550 btrfs_inode_ctime(struct btrfs_inode_item
*inode_item
)
552 unsigned long ptr
= (unsigned long)inode_item
;
553 ptr
+= offsetof(struct btrfs_inode_item
, ctime
);
554 return (struct btrfs_inode_timespec
*)ptr
;
557 static inline struct btrfs_inode_timespec
*
558 btrfs_inode_otime(struct btrfs_inode_item
*inode_item
)
560 unsigned long ptr
= (unsigned long)inode_item
;
561 ptr
+= offsetof(struct btrfs_inode_item
, otime
);
562 return (struct btrfs_inode_timespec
*)ptr
;
565 BTRFS_SETGET_FUNCS(timespec_sec
, struct btrfs_inode_timespec
, sec
, 64);
566 BTRFS_SETGET_FUNCS(timespec_nsec
, struct btrfs_inode_timespec
, nsec
, 32);
568 /* struct btrfs_extent_item */
569 BTRFS_SETGET_FUNCS(extent_refs
, struct btrfs_extent_item
, refs
, 32);
571 /* struct btrfs_extent_ref */
572 BTRFS_SETGET_FUNCS(ref_root
, struct btrfs_extent_ref
, root
, 64);
573 BTRFS_SETGET_FUNCS(ref_generation
, struct btrfs_extent_ref
, generation
, 64);
574 BTRFS_SETGET_FUNCS(ref_objectid
, struct btrfs_extent_ref
, objectid
, 64);
575 BTRFS_SETGET_FUNCS(ref_offset
, struct btrfs_extent_ref
, offset
, 64);
577 BTRFS_SETGET_STACK_FUNCS(stack_ref_root
, struct btrfs_extent_ref
, root
, 64);
578 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation
, struct btrfs_extent_ref
,
580 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid
, struct btrfs_extent_ref
,
582 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset
, struct btrfs_extent_ref
, offset
, 64);
584 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs
, struct btrfs_extent_item
,
587 /* struct btrfs_node */
588 BTRFS_SETGET_FUNCS(key_blockptr
, struct btrfs_key_ptr
, blockptr
, 64);
589 BTRFS_SETGET_FUNCS(key_generation
, struct btrfs_key_ptr
, generation
, 64);
591 static inline u64
btrfs_node_blockptr(struct extent_buffer
*eb
, int nr
)
594 ptr
= offsetof(struct btrfs_node
, ptrs
) +
595 sizeof(struct btrfs_key_ptr
) * nr
;
596 return btrfs_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
);
599 static inline void btrfs_set_node_blockptr(struct extent_buffer
*eb
,
603 ptr
= offsetof(struct btrfs_node
, ptrs
) +
604 sizeof(struct btrfs_key_ptr
) * nr
;
605 btrfs_set_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
608 static inline u64
btrfs_node_ptr_generation(struct extent_buffer
*eb
, int nr
)
611 ptr
= offsetof(struct btrfs_node
, ptrs
) +
612 sizeof(struct btrfs_key_ptr
) * nr
;
613 return btrfs_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
);
616 static inline void btrfs_set_node_ptr_generation(struct extent_buffer
*eb
,
620 ptr
= offsetof(struct btrfs_node
, ptrs
) +
621 sizeof(struct btrfs_key_ptr
) * nr
;
622 btrfs_set_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
625 static inline unsigned long btrfs_node_key_ptr_offset(int nr
)
627 return offsetof(struct btrfs_node
, ptrs
) +
628 sizeof(struct btrfs_key_ptr
) * nr
;
631 void btrfs_node_key(struct extent_buffer
*eb
,
632 struct btrfs_disk_key
*disk_key
, int nr
);
634 static inline void btrfs_set_node_key(struct extent_buffer
*eb
,
635 struct btrfs_disk_key
*disk_key
, int nr
)
638 ptr
= btrfs_node_key_ptr_offset(nr
);
639 write_eb_member(eb
, (struct btrfs_key_ptr
*)ptr
,
640 struct btrfs_key_ptr
, key
, disk_key
);
643 /* struct btrfs_item */
644 BTRFS_SETGET_FUNCS(item_offset
, struct btrfs_item
, offset
, 32);
645 BTRFS_SETGET_FUNCS(item_size
, struct btrfs_item
, size
, 32);
647 static inline unsigned long btrfs_item_nr_offset(int nr
)
649 return offsetof(struct btrfs_leaf
, items
) +
650 sizeof(struct btrfs_item
) * nr
;
653 static inline struct btrfs_item
*btrfs_item_nr(struct extent_buffer
*eb
,
656 return (struct btrfs_item
*)btrfs_item_nr_offset(nr
);
659 static inline u32
btrfs_item_end(struct extent_buffer
*eb
,
660 struct btrfs_item
*item
)
662 return btrfs_item_offset(eb
, item
) + btrfs_item_size(eb
, item
);
665 static inline u32
btrfs_item_end_nr(struct extent_buffer
*eb
, int nr
)
667 return btrfs_item_end(eb
, btrfs_item_nr(eb
, nr
));
670 static inline u32
btrfs_item_offset_nr(struct extent_buffer
*eb
, int nr
)
672 return btrfs_item_offset(eb
, btrfs_item_nr(eb
, nr
));
675 static inline u32
btrfs_item_size_nr(struct extent_buffer
*eb
, int nr
)
677 return btrfs_item_size(eb
, btrfs_item_nr(eb
, nr
));
680 static inline void btrfs_item_key(struct extent_buffer
*eb
,
681 struct btrfs_disk_key
*disk_key
, int nr
)
683 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
684 read_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
687 static inline void btrfs_set_item_key(struct extent_buffer
*eb
,
688 struct btrfs_disk_key
*disk_key
, int nr
)
690 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
691 write_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
694 /* struct btrfs_dir_item */
695 BTRFS_SETGET_FUNCS(dir_data_len
, struct btrfs_dir_item
, data_len
, 16);
696 BTRFS_SETGET_FUNCS(dir_type
, struct btrfs_dir_item
, type
, 8);
697 BTRFS_SETGET_FUNCS(dir_name_len
, struct btrfs_dir_item
, name_len
, 16);
699 static inline void btrfs_dir_item_key(struct extent_buffer
*eb
,
700 struct btrfs_dir_item
*item
,
701 struct btrfs_disk_key
*key
)
703 read_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
706 static inline void btrfs_set_dir_item_key(struct extent_buffer
*eb
,
707 struct btrfs_dir_item
*item
,
708 struct btrfs_disk_key
*key
)
710 write_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
713 /* struct btrfs_disk_key */
714 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid
, struct btrfs_disk_key
,
716 BTRFS_SETGET_STACK_FUNCS(disk_key_offset
, struct btrfs_disk_key
, offset
, 64);
717 BTRFS_SETGET_STACK_FUNCS(disk_key_type
, struct btrfs_disk_key
, type
, 8);
719 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
720 struct btrfs_disk_key
*disk
)
722 cpu
->offset
= le64_to_cpu(disk
->offset
);
723 cpu
->type
= disk
->type
;
724 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
727 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
728 struct btrfs_key
*cpu
)
730 disk
->offset
= cpu_to_le64(cpu
->offset
);
731 disk
->type
= cpu
->type
;
732 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
735 static inline void btrfs_node_key_to_cpu(struct extent_buffer
*eb
,
736 struct btrfs_key
*key
, int nr
)
738 struct btrfs_disk_key disk_key
;
739 btrfs_node_key(eb
, &disk_key
, nr
);
740 btrfs_disk_key_to_cpu(key
, &disk_key
);
743 static inline void btrfs_item_key_to_cpu(struct extent_buffer
*eb
,
744 struct btrfs_key
*key
, int nr
)
746 struct btrfs_disk_key disk_key
;
747 btrfs_item_key(eb
, &disk_key
, nr
);
748 btrfs_disk_key_to_cpu(key
, &disk_key
);
751 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer
*eb
,
752 struct btrfs_dir_item
*item
,
753 struct btrfs_key
*key
)
755 struct btrfs_disk_key disk_key
;
756 btrfs_dir_item_key(eb
, item
, &disk_key
);
757 btrfs_disk_key_to_cpu(key
, &disk_key
);
761 static inline u8
btrfs_key_type(struct btrfs_key
*key
)
766 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u8 val
)
771 /* struct btrfs_header */
772 BTRFS_SETGET_HEADER_FUNCS(header_bytenr
, struct btrfs_header
, bytenr
, 64);
773 BTRFS_SETGET_HEADER_FUNCS(header_generation
, struct btrfs_header
,
775 BTRFS_SETGET_HEADER_FUNCS(header_owner
, struct btrfs_header
, owner
, 64);
776 BTRFS_SETGET_HEADER_FUNCS(header_nritems
, struct btrfs_header
, nritems
, 32);
777 BTRFS_SETGET_HEADER_FUNCS(header_flags
, struct btrfs_header
, flags
, 16);
778 BTRFS_SETGET_HEADER_FUNCS(header_level
, struct btrfs_header
, level
, 8);
780 static inline u8
*btrfs_header_fsid(struct extent_buffer
*eb
)
782 unsigned long ptr
= offsetof(struct btrfs_header
, fsid
);
786 static inline u8
*btrfs_super_fsid(struct extent_buffer
*eb
)
788 unsigned long ptr
= offsetof(struct btrfs_super_block
, fsid
);
792 static inline u8
*btrfs_header_csum(struct extent_buffer
*eb
)
794 unsigned long ptr
= offsetof(struct btrfs_header
, csum
);
798 static inline struct btrfs_node
*btrfs_buffer_node(struct extent_buffer
*eb
)
803 static inline struct btrfs_leaf
*btrfs_buffer_leaf(struct extent_buffer
*eb
)
808 static inline struct btrfs_header
*btrfs_buffer_header(struct extent_buffer
*eb
)
813 static inline int btrfs_is_leaf(struct extent_buffer
*eb
)
815 return (btrfs_header_level(eb
) == 0);
818 /* struct btrfs_root_item */
819 BTRFS_SETGET_FUNCS(disk_root_refs
, struct btrfs_root_item
, refs
, 32);
820 BTRFS_SETGET_FUNCS(disk_root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
821 BTRFS_SETGET_FUNCS(disk_root_level
, struct btrfs_root_item
, level
, 8);
823 BTRFS_SETGET_STACK_FUNCS(root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
824 BTRFS_SETGET_STACK_FUNCS(root_level
, struct btrfs_root_item
, level
, 8);
825 BTRFS_SETGET_STACK_FUNCS(root_dirid
, struct btrfs_root_item
, root_dirid
, 64);
826 BTRFS_SETGET_STACK_FUNCS(root_refs
, struct btrfs_root_item
, refs
, 32);
827 BTRFS_SETGET_STACK_FUNCS(root_flags
, struct btrfs_root_item
, flags
, 32);
828 BTRFS_SETGET_STACK_FUNCS(root_used
, struct btrfs_root_item
, bytes_used
, 64);
829 BTRFS_SETGET_STACK_FUNCS(root_limit
, struct btrfs_root_item
, byte_limit
, 64);
831 /* struct btrfs_super_block */
832 BTRFS_SETGET_STACK_FUNCS(super_bytenr
, struct btrfs_super_block
, bytenr
, 64);
833 BTRFS_SETGET_STACK_FUNCS(super_generation
, struct btrfs_super_block
,
835 BTRFS_SETGET_STACK_FUNCS(super_root
, struct btrfs_super_block
, root
, 64);
836 BTRFS_SETGET_STACK_FUNCS(super_root_level
, struct btrfs_super_block
,
838 BTRFS_SETGET_STACK_FUNCS(super_total_bytes
, struct btrfs_super_block
,
840 BTRFS_SETGET_STACK_FUNCS(super_bytes_used
, struct btrfs_super_block
,
842 BTRFS_SETGET_STACK_FUNCS(super_sectorsize
, struct btrfs_super_block
,
844 BTRFS_SETGET_STACK_FUNCS(super_nodesize
, struct btrfs_super_block
,
846 BTRFS_SETGET_STACK_FUNCS(super_leafsize
, struct btrfs_super_block
,
848 BTRFS_SETGET_STACK_FUNCS(super_stripesize
, struct btrfs_super_block
,
850 BTRFS_SETGET_STACK_FUNCS(super_root_dir
, struct btrfs_super_block
,
851 root_dir_objectid
, 64);
853 static inline unsigned long btrfs_leaf_data(struct extent_buffer
*l
)
855 return offsetof(struct btrfs_leaf
, items
);
858 /* struct btrfs_file_extent_item */
859 BTRFS_SETGET_FUNCS(file_extent_type
, struct btrfs_file_extent_item
, type
, 8);
861 static inline unsigned long btrfs_file_extent_inline_start(struct
862 btrfs_file_extent_item
*e
)
864 unsigned long offset
= (unsigned long)e
;
865 offset
+= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
869 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
871 return offsetof(struct btrfs_file_extent_item
, disk_bytenr
) + datasize
;
874 static inline u32
btrfs_file_extent_inline_len(struct extent_buffer
*eb
,
875 struct btrfs_item
*e
)
877 unsigned long offset
;
878 offset
= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
879 return btrfs_item_size(eb
, e
) - offset
;
882 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr
, struct btrfs_file_extent_item
,
884 BTRFS_SETGET_FUNCS(file_extent_generation
, struct btrfs_file_extent_item
,
886 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes
, struct btrfs_file_extent_item
,
888 BTRFS_SETGET_FUNCS(file_extent_offset
, struct btrfs_file_extent_item
,
890 BTRFS_SETGET_FUNCS(file_extent_num_bytes
, struct btrfs_file_extent_item
,
893 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
895 return sb
->s_fs_info
;
898 static inline int btrfs_set_root_name(struct btrfs_root
*root
,
899 const char *name
, int len
)
901 /* if we already have a name just free it */
905 root
->name
= kmalloc(len
+1, GFP_KERNEL
);
909 memcpy(root
->name
, name
, len
);
910 root
->name
[len
] ='\0';
915 static inline u32
btrfs_level_size(struct btrfs_root
*root
, int level
) {
917 return root
->leafsize
;
918 return root
->nodesize
;
921 /* helper function to cast into the data area of the leaf. */
922 #define btrfs_item_ptr(leaf, slot, type) \
923 ((type *)(btrfs_leaf_data(leaf) + \
924 btrfs_item_offset_nr(leaf, slot)))
926 #define btrfs_item_ptr_offset(leaf, slot) \
927 ((unsigned long)(btrfs_leaf_data(leaf) + \
928 btrfs_item_offset_nr(leaf, slot)))
930 static inline struct dentry
*fdentry(struct file
*file
) {
931 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
932 return file
->f_dentry
;
934 return file
->f_path
.dentry
;
939 u32
btrfs_count_snapshots_in_path(struct btrfs_root
*root
,
940 struct btrfs_path
*count_path
,
942 int btrfs_extent_post_op(struct btrfs_trans_handle
*trans
,
943 struct btrfs_root
*root
);
944 int btrfs_copy_pinned(struct btrfs_root
*root
, struct extent_map_tree
*copy
);
945 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
948 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
949 struct btrfs_block_group_cache
950 *hint
, u64 search_start
,
951 int data
, int owner
);
952 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
953 struct btrfs_root
*root
, u64 owner_objectid
);
954 struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
955 struct btrfs_root
*root
, u32 size
,
957 u64 hint
, u64 empty_size
);
958 struct extent_buffer
*__btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
959 struct btrfs_root
*root
,
967 int btrfs_grow_extent_tree(struct btrfs_trans_handle
*trans
,
968 struct btrfs_root
*root
, u64 new_size
);
969 int btrfs_shrink_extent_tree(struct btrfs_root
*root
, u64 new_size
);
970 int btrfs_insert_extent_backref(struct btrfs_trans_handle
*trans
,
971 struct btrfs_root
*root
,
972 struct btrfs_path
*path
, u64 bytenr
,
973 u64 root_objectid
, u64 ref_generation
,
974 u64 owner
, u64 owner_offset
);
975 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
976 struct btrfs_root
*root
,
977 u64 num_bytes
, u64 root_objectid
, u64 ref_generation
,
978 u64 owner
, u64 owner_offset
,
979 u64 empty_size
, u64 hint_byte
,
980 u64 search_end
, struct btrfs_key
*ins
, int data
);
981 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
982 struct extent_buffer
*buf
);
983 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
984 *root
, u64 bytenr
, u64 num_bytes
,
985 u64 root_objectid
, u64 ref_generation
,
986 u64 owner_objectid
, u64 owner_offset
, int pin
);
987 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
988 struct btrfs_root
*root
,
989 struct extent_map_tree
*unpin
);
990 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
991 struct btrfs_root
*root
,
992 u64 bytenr
, u64 num_bytes
,
993 u64 root_objectid
, u64 ref_generation
,
994 u64 owner
, u64 owner_offset
);
995 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
996 struct btrfs_root
*root
);
997 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
998 int btrfs_read_block_groups(struct btrfs_root
*root
);
1000 int btrfs_cow_block(struct btrfs_trans_handle
*trans
,
1001 struct btrfs_root
*root
, struct extent_buffer
*buf
,
1002 struct extent_buffer
*parent
, int parent_slot
,
1003 struct extent_buffer
**cow_ret
);
1004 int btrfs_copy_root(struct btrfs_trans_handle
*trans
,
1005 struct btrfs_root
*root
,
1006 struct extent_buffer
*buf
,
1007 struct extent_buffer
**cow_ret
, u64 new_root_objectid
);
1008 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1009 *root
, struct btrfs_path
*path
, u32 data_size
);
1010 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
1011 struct btrfs_root
*root
,
1012 struct btrfs_path
*path
,
1013 u32 new_size
, int from_end
);
1014 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1015 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
1017 int btrfs_realloc_node(struct btrfs_trans_handle
*trans
,
1018 struct btrfs_root
*root
, struct extent_buffer
*parent
,
1019 int start_slot
, int cache_only
, u64
*last_ret
,
1020 struct btrfs_key
*progress
);
1021 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
1022 struct btrfs_path
*btrfs_alloc_path(void);
1023 void btrfs_free_path(struct btrfs_path
*p
);
1024 void btrfs_init_path(struct btrfs_path
*p
);
1025 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1026 struct btrfs_path
*path
);
1027 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1028 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1029 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1030 *root
, struct btrfs_path
*path
, struct btrfs_key
1031 *cpu_key
, u32 data_size
);
1032 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1033 int btrfs_prev_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1034 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct extent_buffer
*leaf
);
1035 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1038 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1039 struct btrfs_key
*key
);
1040 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1041 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1043 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1044 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1046 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1047 btrfs_root_item
*item
, struct btrfs_key
*key
);
1048 int btrfs_find_dead_roots(struct btrfs_root
*root
, u64 objectid
,
1049 struct btrfs_root
*latest_root
);
1051 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1052 *root
, const char *name
, int name_len
, u64 dir
,
1053 struct btrfs_key
*location
, u8 type
);
1054 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1055 struct btrfs_root
*root
,
1056 struct btrfs_path
*path
, u64 dir
,
1057 const char *name
, int name_len
,
1059 struct btrfs_dir_item
*
1060 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1061 struct btrfs_root
*root
,
1062 struct btrfs_path
*path
, u64 dir
,
1063 u64 objectid
, const char *name
, int name_len
,
1065 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1066 struct btrfs_path
*path
,
1067 const char *name
, int name_len
);
1068 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1069 struct btrfs_root
*root
,
1070 struct btrfs_path
*path
,
1071 struct btrfs_dir_item
*di
);
1072 int btrfs_insert_xattr_item(struct btrfs_trans_handle
*trans
,
1073 struct btrfs_root
*root
, const char *name
,
1074 u16 name_len
, const void *data
, u16 data_len
,
1076 struct btrfs_dir_item
*btrfs_lookup_xattr(struct btrfs_trans_handle
*trans
,
1077 struct btrfs_root
*root
,
1078 struct btrfs_path
*path
, u64 dir
,
1079 const char *name
, u16 name_len
,
1082 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1083 struct btrfs_root
*fs_root
,
1084 u64 dirid
, u64
*objectid
);
1085 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1088 int btrfs_insert_inode_ref(struct btrfs_trans_handle
*trans
,
1089 struct btrfs_root
*root
,
1090 const char *name
, int name_len
,
1091 u64 inode_objectid
, u64 ref_objectid
);
1092 int btrfs_del_inode_ref(struct btrfs_trans_handle
*trans
,
1093 struct btrfs_root
*root
,
1094 const char *name
, int name_len
,
1095 u64 inode_objectid
, u64 ref_objectid
);
1096 int btrfs_insert_empty_inode(struct btrfs_trans_handle
*trans
,
1097 struct btrfs_root
*root
,
1098 struct btrfs_path
*path
, u64 objectid
);
1099 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1100 *root
, struct btrfs_path
*path
,
1101 struct btrfs_key
*location
, int mod
);
1104 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1105 struct btrfs_root
*root
,
1106 u64 objectid
, u64 pos
, u64 offset
,
1109 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1110 struct btrfs_root
*root
,
1111 struct btrfs_path
*path
, u64 objectid
,
1112 u64 bytenr
, int mod
);
1113 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1114 struct btrfs_root
*root
,
1115 struct inode
*inode
,
1116 u64 objectid
, u64 offset
,
1117 char *data
, size_t len
);
1118 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1119 struct btrfs_root
*root
,
1120 struct btrfs_path
*path
,
1121 u64 objectid
, u64 offset
,
1123 int btrfs_csum_truncate(struct btrfs_trans_handle
*trans
,
1124 struct btrfs_root
*root
, struct btrfs_path
*path
,
1127 unsigned long btrfs_force_ra(struct address_space
*mapping
,
1128 struct file_ra_state
*ra
, struct file
*file
,
1129 pgoff_t offset
, pgoff_t last_index
);
1130 int btrfs_check_free_space(struct btrfs_root
*root
, u64 num_required
,
1132 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1133 int btrfs_readpage(struct file
*file
, struct page
*page
);
1134 void btrfs_delete_inode(struct inode
*inode
);
1135 void btrfs_read_locked_inode(struct inode
*inode
);
1136 int btrfs_write_inode(struct inode
*inode
, int wait
);
1137 void btrfs_dirty_inode(struct inode
*inode
);
1138 struct inode
*btrfs_alloc_inode(struct super_block
*sb
);
1139 void btrfs_destroy_inode(struct inode
*inode
);
1140 int btrfs_init_cachep(void);
1141 void btrfs_destroy_cachep(void);
1142 long btrfs_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
1143 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1144 struct btrfs_root
*root
);
1145 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1146 unsigned from
, unsigned to
);
1147 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1148 size_t page_offset
, u64 start
, u64 end
,
1150 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
1151 struct btrfs_root
*root
,
1152 struct inode
*inode
);
1154 int btrfs_drop_extent_cache(struct inode
*inode
, u64 start
, u64 end
);
1155 extern struct file_operations btrfs_file_operations
;
1156 int btrfs_drop_extents(struct btrfs_trans_handle
*trans
,
1157 struct btrfs_root
*root
, struct inode
*inode
,
1158 u64 start
, u64 end
, u64 inline_limit
, u64
*hint_block
);
1160 int btrfs_defrag_leaves(struct btrfs_trans_handle
*trans
,
1161 struct btrfs_root
*root
, int cache_only
);
1164 int btrfs_init_sysfs(void);
1165 void btrfs_exit_sysfs(void);
1166 int btrfs_sysfs_add_super(struct btrfs_fs_info
*fs
);
1167 int btrfs_sysfs_add_root(struct btrfs_root
*root
);
1168 void btrfs_sysfs_del_root(struct btrfs_root
*root
);
1169 void btrfs_sysfs_del_super(struct btrfs_fs_info
*root
);
1172 ssize_t
btrfs_listxattr(struct dentry
*dentry
, char *buffer
, size_t size
);
1173 int btrfs_delete_xattrs(struct btrfs_trans_handle
*trans
,
1174 struct btrfs_root
*root
, struct inode
*inode
);
1176 u64
btrfs_parse_size(char *str
);