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/workqueue.h>
24 #include <linux/completion.h>
25 #include <asm/kmap_types.h>
26 #include "bit-radix.h"
27 #include "extent_map.h"
29 struct btrfs_trans_handle
;
30 struct btrfs_transaction
;
31 extern struct kmem_cache
*btrfs_trans_handle_cachep
;
32 extern struct kmem_cache
*btrfs_transaction_cachep
;
33 extern struct kmem_cache
*btrfs_bit_radix_cachep
;
34 extern struct kmem_cache
*btrfs_path_cachep
;
36 #define BTRFS_MAGIC "_B2RfS_M"
38 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
39 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
40 #define BTRFS_FS_TREE_OBJECTID 3ULL
41 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
42 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
45 * we can actually store much bigger names, but lets not confuse the rest
48 #define BTRFS_NAME_LEN 255
50 /* 32 bytes in various csum fields */
51 #define BTRFS_CSUM_SIZE 32
52 /* four bytes for CRC32 */
53 #define BTRFS_CRC32_SIZE 4
54 #define BTRFS_EMPTY_DIR_SIZE 6
56 #define BTRFS_FT_UNKNOWN 0
57 #define BTRFS_FT_REG_FILE 1
58 #define BTRFS_FT_DIR 2
59 #define BTRFS_FT_CHRDEV 3
60 #define BTRFS_FT_BLKDEV 4
61 #define BTRFS_FT_FIFO 5
62 #define BTRFS_FT_SOCK 6
63 #define BTRFS_FT_SYMLINK 7
64 #define BTRFS_FT_MAX 8
67 * the key defines the order in the tree, and so it also defines (optimal)
68 * block layout. objectid corresonds to the inode number. The flags
69 * tells us things about the object, and is a kind of stream selector.
70 * so for a given inode, keys with flags of 1 might refer to the inode
71 * data, flags of 2 may point to file data in the btree and flags == 3
72 * may point to extents.
74 * offset is the starting byte offset for this key in the stream.
76 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
77 * in cpu native order. Otherwise they are identical and their sizes
78 * should be the same (ie both packed)
80 struct btrfs_disk_key
{
84 } __attribute__ ((__packed__
));
90 } __attribute__ ((__packed__
));
92 #define BTRFS_FSID_SIZE 16
94 * every tree block (leaf or node) starts with this header.
97 u8 csum
[BTRFS_CSUM_SIZE
];
98 u8 fsid
[BTRFS_FSID_SIZE
]; /* FS specific uuid */
99 __le64 bytenr
; /* which block this node is supposed to live in */
105 } __attribute__ ((__packed__
));
107 #define BTRFS_MAX_LEVEL 8
108 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
109 sizeof(struct btrfs_header)) / \
110 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
111 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
112 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
113 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
114 sizeof(struct btrfs_item) - \
115 sizeof(struct btrfs_file_extent_item))
118 * the super block basically lists the main trees of the FS
119 * it currently lacks any block count etc etc
121 struct btrfs_super_block
{
122 u8 csum
[BTRFS_CSUM_SIZE
];
123 /* the first 3 fields must match struct btrfs_header */
124 u8 fsid
[16]; /* FS specific uuid */
125 __le64 bytenr
; /* this block number */
131 __le64 root_dir_objectid
;
136 } __attribute__ ((__packed__
));
139 * A leaf is full of items. offset and size tell us where to find
140 * the item in the leaf (relative to the start of the data area)
143 struct btrfs_disk_key key
;
146 } __attribute__ ((__packed__
));
149 * leaves have an item area and a data area:
150 * [item0, item1....itemN] [free space] [dataN...data1, data0]
152 * The data is separate from the items to get the keys closer together
156 struct btrfs_header header
;
157 struct btrfs_item items
[];
158 } __attribute__ ((__packed__
));
161 * all non-leaf blocks are nodes, they hold only keys and pointers to
164 struct btrfs_key_ptr
{
165 struct btrfs_disk_key key
;
167 } __attribute__ ((__packed__
));
170 struct btrfs_header header
;
171 struct btrfs_key_ptr ptrs
[];
172 } __attribute__ ((__packed__
));
175 * btrfs_paths remember the path taken from the root down to the leaf.
176 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
177 * to any other levels that are present.
179 * The slots array records the index of the item or block pointer
180 * used while walking the tree.
183 struct extent_buffer
*nodes
[BTRFS_MAX_LEVEL
];
184 int slots
[BTRFS_MAX_LEVEL
];
190 * items in the extent btree are used to record the objectid of the
191 * owner of the block and the number of references
193 struct btrfs_extent_item
{
196 } __attribute__ ((__packed__
));
198 struct btrfs_inode_timespec
{
201 } __attribute__ ((__packed__
));
204 * there is no padding here on purpose. If you want to extent the inode,
205 * make a new item type
207 struct btrfs_inode_item
{
219 struct btrfs_inode_timespec atime
;
220 struct btrfs_inode_timespec ctime
;
221 struct btrfs_inode_timespec mtime
;
222 struct btrfs_inode_timespec otime
;
223 } __attribute__ ((__packed__
));
225 struct btrfs_dir_item
{
226 struct btrfs_disk_key location
;
230 } __attribute__ ((__packed__
));
232 struct btrfs_root_item
{
233 struct btrfs_inode_item inode
;
240 struct btrfs_disk_key drop_progress
;
243 } __attribute__ ((__packed__
));
245 #define BTRFS_FILE_EXTENT_REG 0
246 #define BTRFS_FILE_EXTENT_INLINE 1
248 struct btrfs_file_extent_item
{
252 * disk space consumed by the extent, checksum blocks are included
256 __le64 disk_num_bytes
;
258 * the logical offset in file blocks (no csums)
259 * this extent record is for. This allows a file extent to point
260 * into the middle of an existing extent on disk, sharing it
261 * between two snapshots (useful if some bytes in the middle of the
262 * extent have changed
266 * the logical number of file blocks (no csums included)
269 } __attribute__ ((__packed__
));
271 struct btrfs_csum_item
{
273 } __attribute__ ((__packed__
));
275 /* tag for the radix tree of block groups in ram */
276 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
279 #define BTRFS_BLOCK_GROUP_DATA 1
280 struct btrfs_block_group_item
{
283 } __attribute__ ((__packed__
));
285 struct btrfs_block_group_cache
{
286 struct btrfs_key key
;
287 struct btrfs_block_group_item item
;
292 struct btrfs_fs_info
{
293 u8 fsid
[BTRFS_FSID_SIZE
];
294 struct btrfs_root
*extent_root
;
295 struct btrfs_root
*tree_root
;
296 struct radix_tree_root fs_roots_radix
;
298 struct extent_map_tree free_space_cache
;
299 struct extent_map_tree block_group_cache
;
300 struct extent_map_tree pinned_extents
;
301 struct extent_map_tree pending_del
;
302 struct extent_map_tree extent_ins
;
305 u64 last_trans_committed
;
306 struct btrfs_transaction
*running_transaction
;
307 struct btrfs_super_block super_copy
;
308 struct extent_buffer
*sb_buffer
;
309 struct super_block
*sb
;
310 struct inode
*btree_inode
;
311 struct mutex trans_mutex
;
312 struct mutex fs_mutex
;
313 struct list_head trans_list
;
314 struct list_head dead_roots
;
315 struct delayed_work trans_work
;
316 struct kobject super_kobj
;
317 struct completion kobj_unregister
;
323 * in ram representation of the tree. extent_root is used for all allocations
324 * and for the extent tree extent_root root.
327 struct extent_buffer
*node
;
328 struct extent_buffer
*commit_root
;
329 struct btrfs_root_item root_item
;
330 struct btrfs_key root_key
;
331 struct btrfs_fs_info
*fs_info
;
333 struct kobject root_kobj
;
334 struct completion kobj_unregister
;
335 struct rw_semaphore snap_sem
;
339 /* data allocations are done in sectorsize units */
342 /* node allocations are done in nodesize units */
345 /* leaf allocations are done in leafsize units */
350 u64 last_inode_alloc
;
352 struct btrfs_key defrag_progress
;
359 * inode items have the data typically returned from stat and store other
360 * info about object characteristics. There is one for every file and dir in
363 #define BTRFS_INODE_ITEM_KEY 1
365 /* reserve 2-15 close to the inode for later flexibility */
368 * dir items are the name -> inode pointers in a directory. There is one
369 * for every name in a directory.
371 #define BTRFS_DIR_ITEM_KEY 16
372 #define BTRFS_DIR_INDEX_KEY 17
374 * extent data is for file data
376 #define BTRFS_EXTENT_DATA_KEY 18
378 * csum items have the checksums for data in the extents
380 #define BTRFS_CSUM_ITEM_KEY 19
382 /* reserve 20-31 for other file stuff */
385 * root items point to tree roots. There are typically in the root
386 * tree used by the super block to find all the other trees
388 #define BTRFS_ROOT_ITEM_KEY 32
390 * extent items are in the extent map tree. These record which blocks
391 * are used, and how many references there are to each block
393 #define BTRFS_EXTENT_ITEM_KEY 33
396 * block groups give us hints into the extent allocation trees. Which
397 * blocks are free etc etc
399 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
402 * string items are for debugging. They just store a short string of
405 #define BTRFS_STRING_ITEM_KEY 253
407 /* some macros to generate set/get funcs for the struct fields. This
408 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
411 #define le8_to_cpu(v) (v)
412 #define cpu_to_le8(v) (v)
415 #define read_eb_member(eb, ptr, type, member, result) ( \
416 read_extent_buffer(eb, (char *)(result), \
417 ((unsigned long)(ptr)) + \
418 offsetof(type, member), \
419 sizeof(((type *)0)->member)))
421 #define write_eb_member(eb, ptr, type, member, result) ( \
422 write_extent_buffer(eb, (char *)(result), \
423 ((unsigned long)(ptr)) + \
424 offsetof(type, member), \
425 sizeof(((type *)0)->member)))
427 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
428 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
434 int unmap_on_exit = (eb->map_token == NULL); \
435 unsigned long map_start; \
436 unsigned long map_len; \
437 unsigned long offset = (unsigned long)s + \
438 offsetof(type, member); \
439 err = map_extent_buffer(eb, offset, \
440 sizeof(((type *)0)->member), \
441 &map_token, &kaddr, \
442 &map_start, &map_len, KM_USER1); \
444 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
446 u##bits res = le##bits##_to_cpu(*tmp); \
448 unmap_extent_buffer(eb, map_token, KM_USER1); \
452 read_eb_member(eb, s, type, member, &res); \
453 return le##bits##_to_cpu(res); \
456 static inline void btrfs_set_##name(struct extent_buffer *eb, \
457 type *s, u##bits val) \
462 unsigned long map_start; \
463 unsigned long map_len; \
464 int unmap_on_exit = (eb->map_token == NULL); \
465 unsigned long offset = (unsigned long)s + \
466 offsetof(type, member); \
467 err = map_extent_buffer(eb, offset, \
468 sizeof(((type *)0)->member), \
469 &map_token, &kaddr, \
470 &map_start, &map_len, KM_USER1); \
472 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
474 *tmp = cpu_to_le##bits(val); \
476 unmap_extent_buffer(eb, map_token, KM_USER1); \
478 val = cpu_to_le##bits(val); \
479 write_eb_member(eb, s, type, member, &val); \
483 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
484 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
489 unsigned long map_start; \
490 unsigned long map_len; \
491 unsigned long offset = offsetof(type, member); \
492 int unmap_on_exit = (eb->map_token == NULL); \
493 err = map_extent_buffer(eb, offset, \
494 sizeof(((type *)0)->member), \
495 &map_token, &kaddr, \
496 &map_start, &map_len, KM_USER1); \
498 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
500 u##bits res = le##bits##_to_cpu(*tmp); \
502 unmap_extent_buffer(eb, map_token, KM_USER1); \
506 read_eb_member(eb, NULL, type, member, &res); \
507 return le##bits##_to_cpu(res); \
510 static inline void btrfs_set_##name(struct extent_buffer *eb, \
516 unsigned long map_start; \
517 unsigned long map_len; \
518 unsigned long offset = offsetof(type, member); \
519 int unmap_on_exit = (eb->map_token == NULL); \
520 err = map_extent_buffer(eb, offset, \
521 sizeof(((type *)0)->member), \
522 &map_token, &kaddr, \
523 &map_start, &map_len, KM_USER1); \
525 __le##bits *tmp = (__le##bits *)(kaddr + offset - \
527 *tmp = cpu_to_le##bits(val); \
529 unmap_extent_buffer(eb, map_token, KM_USER1); \
531 val = cpu_to_le##bits(val); \
532 write_eb_member(eb, NULL, type, member, &val); \
536 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
537 static inline u##bits btrfs_##name(type *s) \
539 return le##bits##_to_cpu(s->member); \
541 static inline void btrfs_set_##name(type *s, u##bits val) \
543 s->member = cpu_to_le##bits(val); \
546 /* struct btrfs_block_group_item */
547 BTRFS_SETGET_STACK_FUNCS(block_group_used
, struct btrfs_block_group_item
,
549 BTRFS_SETGET_FUNCS(disk_block_group_used
, struct btrfs_block_group_item
,
552 /* struct btrfs_inode_item */
553 BTRFS_SETGET_FUNCS(inode_generation
, struct btrfs_inode_item
, generation
, 64);
554 BTRFS_SETGET_FUNCS(inode_size
, struct btrfs_inode_item
, size
, 64);
555 BTRFS_SETGET_FUNCS(inode_nblocks
, struct btrfs_inode_item
, nblocks
, 64);
556 BTRFS_SETGET_FUNCS(inode_block_group
, struct btrfs_inode_item
, block_group
, 64);
557 BTRFS_SETGET_FUNCS(inode_nlink
, struct btrfs_inode_item
, nlink
, 32);
558 BTRFS_SETGET_FUNCS(inode_uid
, struct btrfs_inode_item
, uid
, 32);
559 BTRFS_SETGET_FUNCS(inode_gid
, struct btrfs_inode_item
, gid
, 32);
560 BTRFS_SETGET_FUNCS(inode_mode
, struct btrfs_inode_item
, mode
, 32);
561 BTRFS_SETGET_FUNCS(inode_rdev
, struct btrfs_inode_item
, rdev
, 32);
562 BTRFS_SETGET_FUNCS(inode_flags
, struct btrfs_inode_item
, flags
, 16);
563 BTRFS_SETGET_FUNCS(inode_compat_flags
, struct btrfs_inode_item
,
566 static inline struct btrfs_inode_timespec
*
567 btrfs_inode_atime(struct btrfs_inode_item
*inode_item
)
569 unsigned long ptr
= (unsigned long)inode_item
;
570 ptr
+= offsetof(struct btrfs_inode_item
, atime
);
571 return (struct btrfs_inode_timespec
*)ptr
;
574 static inline struct btrfs_inode_timespec
*
575 btrfs_inode_mtime(struct btrfs_inode_item
*inode_item
)
577 unsigned long ptr
= (unsigned long)inode_item
;
578 ptr
+= offsetof(struct btrfs_inode_item
, mtime
);
579 return (struct btrfs_inode_timespec
*)ptr
;
582 static inline struct btrfs_inode_timespec
*
583 btrfs_inode_ctime(struct btrfs_inode_item
*inode_item
)
585 unsigned long ptr
= (unsigned long)inode_item
;
586 ptr
+= offsetof(struct btrfs_inode_item
, ctime
);
587 return (struct btrfs_inode_timespec
*)ptr
;
590 static inline struct btrfs_inode_timespec
*
591 btrfs_inode_otime(struct btrfs_inode_item
*inode_item
)
593 unsigned long ptr
= (unsigned long)inode_item
;
594 ptr
+= offsetof(struct btrfs_inode_item
, otime
);
595 return (struct btrfs_inode_timespec
*)ptr
;
598 BTRFS_SETGET_FUNCS(timespec_sec
, struct btrfs_inode_timespec
, sec
, 64);
599 BTRFS_SETGET_FUNCS(timespec_nsec
, struct btrfs_inode_timespec
, nsec
, 32);
601 /* struct btrfs_extent_item */
602 BTRFS_SETGET_FUNCS(extent_refs
, struct btrfs_extent_item
, refs
, 32);
603 BTRFS_SETGET_FUNCS(extent_owner
, struct btrfs_extent_item
, owner
, 32);
605 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs
, struct btrfs_extent_item
,
607 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner
, struct btrfs_extent_item
,
610 /* struct btrfs_node */
611 BTRFS_SETGET_FUNCS(key_blockptr
, struct btrfs_key_ptr
, blockptr
, 64);
613 static inline u64
btrfs_node_blockptr(struct extent_buffer
*eb
, int nr
)
616 ptr
= offsetof(struct btrfs_node
, ptrs
) +
617 sizeof(struct btrfs_key_ptr
) * nr
;
618 return btrfs_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
);
621 static inline void btrfs_set_node_blockptr(struct extent_buffer
*eb
,
625 ptr
= offsetof(struct btrfs_node
, ptrs
) +
626 sizeof(struct btrfs_key_ptr
) * nr
;
627 btrfs_set_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
630 static unsigned long btrfs_node_key_ptr_offset(int nr
)
632 return offsetof(struct btrfs_node
, ptrs
) +
633 sizeof(struct btrfs_key_ptr
) * nr
;
636 static void btrfs_node_key(struct extent_buffer
*eb
,
637 struct btrfs_disk_key
*disk_key
, int nr
)
640 ptr
= btrfs_node_key_ptr_offset(nr
);
641 read_eb_member(eb
, (struct btrfs_key_ptr
*)ptr
,
642 struct btrfs_key_ptr
, key
, disk_key
);
644 static inline void btrfs_set_node_key(struct extent_buffer
*eb
,
645 struct btrfs_disk_key
*disk_key
, int nr
)
648 ptr
= btrfs_node_key_ptr_offset(nr
);
649 write_eb_member(eb
, (struct btrfs_key_ptr
*)ptr
,
650 struct btrfs_key_ptr
, key
, disk_key
);
653 /* struct btrfs_item */
654 BTRFS_SETGET_FUNCS(item_offset
, struct btrfs_item
, offset
, 32);
655 BTRFS_SETGET_FUNCS(item_size
, struct btrfs_item
, size
, 32);
657 static inline unsigned long btrfs_item_nr_offset(int nr
)
659 return offsetof(struct btrfs_leaf
, items
) +
660 sizeof(struct btrfs_item
) * nr
;
663 static inline struct btrfs_item
*btrfs_item_nr(struct extent_buffer
*eb
,
666 return (struct btrfs_item
*)btrfs_item_nr_offset(nr
);
669 static inline u32
btrfs_item_end(struct extent_buffer
*eb
,
670 struct btrfs_item
*item
)
672 return btrfs_item_offset(eb
, item
) + btrfs_item_size(eb
, item
);
675 static inline u32
btrfs_item_end_nr(struct extent_buffer
*eb
, int nr
)
677 return btrfs_item_end(eb
, btrfs_item_nr(eb
, nr
));
680 static inline u32
btrfs_item_offset_nr(struct extent_buffer
*eb
, int nr
)
682 return btrfs_item_offset(eb
, btrfs_item_nr(eb
, nr
));
685 static inline u32
btrfs_item_size_nr(struct extent_buffer
*eb
, int nr
)
687 return btrfs_item_size(eb
, btrfs_item_nr(eb
, nr
));
690 static inline void btrfs_item_key(struct extent_buffer
*eb
,
691 struct btrfs_disk_key
*disk_key
, int nr
)
693 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
694 read_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
697 static inline void btrfs_set_item_key(struct extent_buffer
*eb
,
698 struct btrfs_disk_key
*disk_key
, int nr
)
700 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
701 write_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
704 /* struct btrfs_dir_item */
705 BTRFS_SETGET_FUNCS(dir_flags
, struct btrfs_dir_item
, flags
, 16);
706 BTRFS_SETGET_FUNCS(dir_type
, struct btrfs_dir_item
, type
, 8);
707 BTRFS_SETGET_FUNCS(dir_name_len
, struct btrfs_dir_item
, name_len
, 16);
709 static inline void btrfs_dir_item_key(struct extent_buffer
*eb
,
710 struct btrfs_dir_item
*item
,
711 struct btrfs_disk_key
*key
)
713 read_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
716 static inline void btrfs_set_dir_item_key(struct extent_buffer
*eb
,
717 struct btrfs_dir_item
*item
,
718 struct btrfs_disk_key
*key
)
720 write_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
723 /* struct btrfs_disk_key */
724 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid
, struct btrfs_disk_key
,
726 BTRFS_SETGET_STACK_FUNCS(disk_key_offset
, struct btrfs_disk_key
, offset
, 64);
727 BTRFS_SETGET_STACK_FUNCS(disk_key_type
, struct btrfs_disk_key
, type
, 8);
729 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
730 struct btrfs_disk_key
*disk
)
732 cpu
->offset
= le64_to_cpu(disk
->offset
);
733 cpu
->type
= disk
->type
;
734 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
737 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
738 struct btrfs_key
*cpu
)
740 disk
->offset
= cpu_to_le64(cpu
->offset
);
741 disk
->type
= cpu
->type
;
742 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
745 static inline void btrfs_node_key_to_cpu(struct extent_buffer
*eb
,
746 struct btrfs_key
*key
, int nr
)
748 struct btrfs_disk_key disk_key
;
749 btrfs_node_key(eb
, &disk_key
, nr
);
750 btrfs_disk_key_to_cpu(key
, &disk_key
);
753 static inline void btrfs_item_key_to_cpu(struct extent_buffer
*eb
,
754 struct btrfs_key
*key
, int nr
)
756 struct btrfs_disk_key disk_key
;
757 btrfs_item_key(eb
, &disk_key
, nr
);
758 btrfs_disk_key_to_cpu(key
, &disk_key
);
761 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer
*eb
,
762 struct btrfs_dir_item
*item
,
763 struct btrfs_key
*key
)
765 struct btrfs_disk_key disk_key
;
766 btrfs_dir_item_key(eb
, item
, &disk_key
);
767 btrfs_disk_key_to_cpu(key
, &disk_key
);
771 static inline u8
btrfs_key_type(struct btrfs_key
*key
)
776 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u8 val
)
781 /* struct btrfs_header */
782 BTRFS_SETGET_HEADER_FUNCS(header_bytenr
, struct btrfs_header
, bytenr
, 64);
783 BTRFS_SETGET_HEADER_FUNCS(header_generation
, struct btrfs_header
,
785 BTRFS_SETGET_HEADER_FUNCS(header_owner
, struct btrfs_header
, owner
, 64);
786 BTRFS_SETGET_HEADER_FUNCS(header_nritems
, struct btrfs_header
, nritems
, 32);
787 BTRFS_SETGET_HEADER_FUNCS(header_flags
, struct btrfs_header
, flags
, 16);
788 BTRFS_SETGET_HEADER_FUNCS(header_level
, struct btrfs_header
, level
, 8);
790 static inline u8
*btrfs_header_fsid(struct extent_buffer
*eb
)
792 unsigned long ptr
= offsetof(struct btrfs_header
, fsid
);
796 static inline u8
*btrfs_super_fsid(struct extent_buffer
*eb
)
798 unsigned long ptr
= offsetof(struct btrfs_super_block
, fsid
);
802 static inline u8
*btrfs_header_csum(struct extent_buffer
*eb
)
804 unsigned long ptr
= offsetof(struct btrfs_header
, csum
);
808 static inline struct btrfs_node
*btrfs_buffer_node(struct extent_buffer
*eb
)
813 static inline struct btrfs_leaf
*btrfs_buffer_leaf(struct extent_buffer
*eb
)
818 static inline struct btrfs_header
*btrfs_buffer_header(struct extent_buffer
*eb
)
823 static inline int btrfs_is_leaf(struct extent_buffer
*eb
)
825 return (btrfs_header_level(eb
) == 0);
828 /* struct btrfs_root_item */
829 BTRFS_SETGET_FUNCS(disk_root_refs
, struct btrfs_root_item
, refs
, 32);
830 BTRFS_SETGET_FUNCS(disk_root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
831 BTRFS_SETGET_FUNCS(disk_root_level
, struct btrfs_root_item
, level
, 8);
833 BTRFS_SETGET_STACK_FUNCS(root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
834 BTRFS_SETGET_STACK_FUNCS(root_level
, struct btrfs_root_item
, level
, 8);
835 BTRFS_SETGET_STACK_FUNCS(root_dirid
, struct btrfs_root_item
, root_dirid
, 64);
836 BTRFS_SETGET_STACK_FUNCS(root_refs
, struct btrfs_root_item
, refs
, 32);
837 BTRFS_SETGET_STACK_FUNCS(root_flags
, struct btrfs_root_item
, flags
, 32);
838 BTRFS_SETGET_STACK_FUNCS(root_used
, struct btrfs_root_item
, bytes_used
, 64);
839 BTRFS_SETGET_STACK_FUNCS(root_limit
, struct btrfs_root_item
, byte_limit
, 64);
841 /* struct btrfs_super_block */
842 BTRFS_SETGET_STACK_FUNCS(super_bytenr
, struct btrfs_super_block
, bytenr
, 64);
843 BTRFS_SETGET_STACK_FUNCS(super_generation
, struct btrfs_super_block
,
845 BTRFS_SETGET_STACK_FUNCS(super_root
, struct btrfs_super_block
, root
, 64);
846 BTRFS_SETGET_STACK_FUNCS(super_root_level
, struct btrfs_super_block
,
848 BTRFS_SETGET_STACK_FUNCS(super_total_bytes
, struct btrfs_super_block
,
850 BTRFS_SETGET_STACK_FUNCS(super_bytes_used
, struct btrfs_super_block
,
852 BTRFS_SETGET_STACK_FUNCS(super_sectorsize
, struct btrfs_super_block
,
854 BTRFS_SETGET_STACK_FUNCS(super_nodesize
, struct btrfs_super_block
,
856 BTRFS_SETGET_STACK_FUNCS(super_leafsize
, struct btrfs_super_block
,
858 BTRFS_SETGET_STACK_FUNCS(super_root_dir
, struct btrfs_super_block
,
859 root_dir_objectid
, 64);
861 static inline unsigned long btrfs_leaf_data(struct extent_buffer
*l
)
863 return offsetof(struct btrfs_leaf
, items
);
866 /* struct btrfs_file_extent_item */
867 BTRFS_SETGET_FUNCS(file_extent_type
, struct btrfs_file_extent_item
, type
, 8);
869 static inline unsigned long btrfs_file_extent_inline_start(struct
870 btrfs_file_extent_item
*e
)
872 unsigned long offset
= (unsigned long)e
;
873 offset
+= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
877 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
879 return offsetof(struct btrfs_file_extent_item
, disk_bytenr
) + datasize
;
882 static inline u32
btrfs_file_extent_inline_len(struct extent_buffer
*eb
,
883 struct btrfs_item
*e
)
885 unsigned long offset
;
886 offset
= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
887 return btrfs_item_size(eb
, e
) - offset
;
890 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr
, struct btrfs_file_extent_item
,
892 BTRFS_SETGET_FUNCS(file_extent_generation
, struct btrfs_file_extent_item
,
894 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes
, struct btrfs_file_extent_item
,
896 BTRFS_SETGET_FUNCS(file_extent_offset
, struct btrfs_file_extent_item
,
898 BTRFS_SETGET_FUNCS(file_extent_num_bytes
, struct btrfs_file_extent_item
,
901 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
903 return sb
->s_fs_info
;
906 static inline int btrfs_set_root_name(struct btrfs_root
*root
,
907 const char *name
, int len
)
909 /* if we already have a name just free it */
913 root
->name
= kmalloc(len
+1, GFP_KERNEL
);
917 memcpy(root
->name
, name
, len
);
918 root
->name
[len
] ='\0';
923 static inline u32
btrfs_level_size(struct btrfs_root
*root
, int level
) {
925 return root
->leafsize
;
926 return root
->nodesize
;
929 /* helper function to cast into the data area of the leaf. */
930 #define btrfs_item_ptr(leaf, slot, type) \
931 ((type *)(btrfs_leaf_data(leaf) + \
932 btrfs_item_offset_nr(leaf, slot)))
934 #define btrfs_item_ptr_offset(leaf, slot) \
935 ((unsigned long)(btrfs_leaf_data(leaf) + \
936 btrfs_item_offset_nr(leaf, slot)))
938 /* mount option defines and helpers */
939 #define BTRFS_MOUNT_SUBVOL 0x000001
940 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
941 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
942 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
945 int btrfs_extent_post_op(struct btrfs_trans_handle
*trans
,
946 struct btrfs_root
*root
);
947 int btrfs_copy_pinned(struct btrfs_root
*root
, struct extent_map_tree
*copy
);
948 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
951 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
952 struct btrfs_block_group_cache
953 *hint
, u64 search_start
,
954 int data
, int owner
);
955 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
956 struct btrfs_root
*root
);
957 struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
958 struct btrfs_root
*root
, u32 size
,
959 u64 hint
, u64 empty_size
);
960 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
961 struct btrfs_root
*root
, u64 owner
,
962 u64 num_bytes
, u64 empty_size
, u64 search_start
,
963 u64 search_end
, struct btrfs_key
*ins
, int data
);
964 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
965 struct extent_buffer
*buf
);
966 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
967 *root
, u64 bytenr
, u64 num_bytes
, int pin
);
968 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
969 struct btrfs_root
*root
,
970 struct extent_map_tree
*unpin
);
971 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
972 struct btrfs_root
*root
,
973 u64 bytenr
, u64 num_bytes
);
974 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
975 struct btrfs_root
*root
);
976 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
977 int btrfs_read_block_groups(struct btrfs_root
*root
);
979 int btrfs_cow_block(struct btrfs_trans_handle
*trans
,
980 struct btrfs_root
*root
, struct extent_buffer
*buf
,
981 struct extent_buffer
*parent
, int parent_slot
,
982 struct extent_buffer
**cow_ret
);
983 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
984 *root
, struct btrfs_path
*path
, u32 data_size
);
985 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
986 struct btrfs_root
*root
,
987 struct btrfs_path
*path
,
989 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
990 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
992 int btrfs_realloc_node(struct btrfs_trans_handle
*trans
,
993 struct btrfs_root
*root
, struct extent_buffer
*parent
,
994 int cache_only
, u64
*last_ret
);
995 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
996 struct btrfs_path
*btrfs_alloc_path(void);
997 void btrfs_free_path(struct btrfs_path
*p
);
998 void btrfs_init_path(struct btrfs_path
*p
);
999 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1000 struct btrfs_path
*path
);
1001 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1002 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1003 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1004 *root
, struct btrfs_path
*path
, struct btrfs_key
1005 *cpu_key
, u32 data_size
);
1006 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1007 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct extent_buffer
*leaf
);
1008 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1011 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1012 struct btrfs_key
*key
);
1013 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1014 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1016 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1017 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1019 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1020 btrfs_root_item
*item
, struct btrfs_key
*key
);
1021 int btrfs_find_dead_roots(struct btrfs_root
*root
, u64 objectid
,
1022 struct btrfs_root
*latest_root
);
1024 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1025 *root
, const char *name
, int name_len
, u64 dir
,
1026 struct btrfs_key
*location
, u8 type
);
1027 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1028 struct btrfs_root
*root
,
1029 struct btrfs_path
*path
, u64 dir
,
1030 const char *name
, int name_len
,
1032 struct btrfs_dir_item
*
1033 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1034 struct btrfs_root
*root
,
1035 struct btrfs_path
*path
, u64 dir
,
1036 u64 objectid
, const char *name
, int name_len
,
1038 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1039 struct btrfs_path
*path
,
1040 const char *name
, int name_len
);
1041 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1042 struct btrfs_root
*root
,
1043 struct btrfs_path
*path
,
1044 struct btrfs_dir_item
*di
);
1046 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1047 struct btrfs_root
*fs_root
,
1048 u64 dirid
, u64
*objectid
);
1049 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1052 int btrfs_insert_empty_inode(struct btrfs_trans_handle
*trans
,
1053 struct btrfs_root
*root
,
1054 struct btrfs_path
*path
, u64 objectid
);
1055 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1056 *root
, struct btrfs_path
*path
,
1057 struct btrfs_key
*location
, int mod
);
1060 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1061 struct btrfs_root
*root
,
1062 u64 objectid
, u64 pos
, u64 offset
,
1065 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1066 struct btrfs_root
*root
,
1067 struct btrfs_path
*path
, u64 objectid
,
1068 u64 bytenr
, int mod
);
1069 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1070 struct btrfs_root
*root
,
1071 u64 objectid
, u64 offset
,
1072 char *data
, size_t len
);
1073 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1074 struct btrfs_root
*root
,
1075 struct btrfs_path
*path
,
1076 u64 objectid
, u64 offset
,
1078 int btrfs_csum_truncate(struct btrfs_trans_handle
*trans
,
1079 struct btrfs_root
*root
, struct btrfs_path
*path
,
1082 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1083 int btrfs_readpage(struct file
*file
, struct page
*page
);
1084 void btrfs_delete_inode(struct inode
*inode
);
1085 void btrfs_read_locked_inode(struct inode
*inode
);
1086 int btrfs_write_inode(struct inode
*inode
, int wait
);
1087 void btrfs_dirty_inode(struct inode
*inode
);
1088 struct inode
*btrfs_alloc_inode(struct super_block
*sb
);
1089 void btrfs_destroy_inode(struct inode
*inode
);
1090 int btrfs_init_cachep(void);
1091 void btrfs_destroy_cachep(void);
1092 long btrfs_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
1093 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1094 struct btrfs_root
*root
);
1095 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1096 unsigned from
, unsigned to
);
1097 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1098 size_t page_offset
, u64 start
, u64 end
,
1100 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
1101 struct btrfs_root
*root
,
1102 struct inode
*inode
);
1104 int btrfs_drop_extent_cache(struct inode
*inode
, u64 start
, u64 end
);
1105 extern struct file_operations btrfs_file_operations
;
1106 int btrfs_drop_extents(struct btrfs_trans_handle
*trans
,
1107 struct btrfs_root
*root
, struct inode
*inode
,
1108 u64 start
, u64 end
, u64
*hint_block
);
1110 int btrfs_defrag_leaves(struct btrfs_trans_handle
*trans
,
1111 struct btrfs_root
*root
, int cache_only
);
1114 int btrfs_init_sysfs(void);
1115 void btrfs_exit_sysfs(void);
1116 int btrfs_sysfs_add_super(struct btrfs_fs_info
*fs
);
1117 int btrfs_sysfs_add_root(struct btrfs_root
*root
);
1118 void btrfs_sysfs_del_root(struct btrfs_root
*root
);
1119 void btrfs_sysfs_del_super(struct btrfs_fs_info
*root
);