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.
19 #ifndef __BTRFS_CTREE__
20 #define __BTRFS_CTREE__
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_io.h"
31 #include "extent_map.h"
33 struct btrfs_trans_handle
;
34 struct btrfs_transaction
;
35 extern struct kmem_cache
*btrfs_trans_handle_cachep
;
36 extern struct kmem_cache
*btrfs_transaction_cachep
;
37 extern struct kmem_cache
*btrfs_bit_radix_cachep
;
38 extern struct kmem_cache
*btrfs_path_cachep
;
40 #define BTRFS_MAGIC "_B3RfS_M"
42 #define BTRFS_MAX_LEVEL 8
43 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
44 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
45 #define BTRFS_FS_TREE_OBJECTID 3ULL
46 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
47 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
50 * we can actually store much bigger names, but lets not confuse the rest
53 #define BTRFS_NAME_LEN 255
55 /* 32 bytes in various csum fields */
56 #define BTRFS_CSUM_SIZE 32
57 /* four bytes for CRC32 */
58 #define BTRFS_CRC32_SIZE 4
59 #define BTRFS_EMPTY_DIR_SIZE 0
61 #define BTRFS_FT_UNKNOWN 0
62 #define BTRFS_FT_REG_FILE 1
63 #define BTRFS_FT_DIR 2
64 #define BTRFS_FT_CHRDEV 3
65 #define BTRFS_FT_BLKDEV 4
66 #define BTRFS_FT_FIFO 5
67 #define BTRFS_FT_SOCK 6
68 #define BTRFS_FT_SYMLINK 7
69 #define BTRFS_FT_XATTR 8
70 #define BTRFS_FT_MAX 9
73 * the key defines the order in the tree, and so it also defines (optimal)
74 * block layout. objectid corresonds to the inode number. The flags
75 * tells us things about the object, and is a kind of stream selector.
76 * so for a given inode, keys with flags of 1 might refer to the inode
77 * data, flags of 2 may point to file data in the btree and flags == 3
78 * may point to extents.
80 * offset is the starting byte offset for this key in the stream.
82 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
83 * in cpu native order. Otherwise they are identical and their sizes
84 * should be the same (ie both packed)
86 struct btrfs_disk_key
{
90 } __attribute__ ((__packed__
));
96 } __attribute__ ((__packed__
));
98 #define BTRFS_FSID_SIZE 16
100 * every tree block (leaf or node) starts with this header.
102 struct btrfs_header
{
103 u8 csum
[BTRFS_CSUM_SIZE
];
104 u8 fsid
[BTRFS_FSID_SIZE
]; /* FS specific uuid */
105 __le64 bytenr
; /* which block this node is supposed to live in */
111 } __attribute__ ((__packed__
));
113 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
114 sizeof(struct btrfs_header)) / \
115 sizeof(struct btrfs_key_ptr))
116 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
117 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
118 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
119 sizeof(struct btrfs_item) - \
120 sizeof(struct btrfs_file_extent_item))
123 * the super block basically lists the main trees of the FS
124 * it currently lacks any block count etc etc
126 struct btrfs_super_block
{
127 u8 csum
[BTRFS_CSUM_SIZE
];
128 /* the first 3 fields must match struct btrfs_header */
129 u8 fsid
[16]; /* FS specific uuid */
130 __le64 bytenr
; /* this block number */
136 __le64 root_dir_objectid
;
142 } __attribute__ ((__packed__
));
145 * A leaf is full of items. offset and size tell us where to find
146 * the item in the leaf (relative to the start of the data area)
149 struct btrfs_disk_key key
;
152 } __attribute__ ((__packed__
));
155 * leaves have an item area and a data area:
156 * [item0, item1....itemN] [free space] [dataN...data1, data0]
158 * The data is separate from the items to get the keys closer together
162 struct btrfs_header header
;
163 struct btrfs_item items
[];
164 } __attribute__ ((__packed__
));
167 * all non-leaf blocks are nodes, they hold only keys and pointers to
170 struct btrfs_key_ptr
{
171 struct btrfs_disk_key key
;
174 } __attribute__ ((__packed__
));
177 struct btrfs_header header
;
178 struct btrfs_key_ptr ptrs
[];
179 } __attribute__ ((__packed__
));
182 * btrfs_paths remember the path taken from the root down to the leaf.
183 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
184 * to any other levels that are present.
186 * The slots array records the index of the item or block pointer
187 * used while walking the tree.
190 struct extent_buffer
*nodes
[BTRFS_MAX_LEVEL
];
191 int slots
[BTRFS_MAX_LEVEL
];
197 * items in the extent btree are used to record the objectid of the
198 * owner of the block and the number of references
200 struct btrfs_extent_item
{
202 } __attribute__ ((__packed__
));
204 struct btrfs_extent_ref
{
209 } __attribute__ ((__packed__
));
211 struct btrfs_inode_ref
{
214 } __attribute__ ((__packed__
));
216 struct btrfs_inode_timespec
{
219 } __attribute__ ((__packed__
));
222 * there is no padding here on purpose. If you want to extent the inode,
223 * make a new item type
225 struct btrfs_inode_item
{
237 struct btrfs_inode_timespec atime
;
238 struct btrfs_inode_timespec ctime
;
239 struct btrfs_inode_timespec mtime
;
240 struct btrfs_inode_timespec otime
;
241 } __attribute__ ((__packed__
));
243 struct btrfs_dir_item
{
244 struct btrfs_disk_key location
;
248 } __attribute__ ((__packed__
));
250 struct btrfs_root_item
{
251 struct btrfs_inode_item inode
;
258 struct btrfs_disk_key drop_progress
;
261 } __attribute__ ((__packed__
));
263 #define BTRFS_FILE_EXTENT_REG 0
264 #define BTRFS_FILE_EXTENT_INLINE 1
266 struct btrfs_file_extent_item
{
270 * disk space consumed by the extent, checksum blocks are included
274 __le64 disk_num_bytes
;
276 * the logical offset in file blocks (no csums)
277 * this extent record is for. This allows a file extent to point
278 * into the middle of an existing extent on disk, sharing it
279 * between two snapshots (useful if some bytes in the middle of the
280 * extent have changed
284 * the logical number of file blocks (no csums included)
287 } __attribute__ ((__packed__
));
289 struct btrfs_csum_item
{
291 } __attribute__ ((__packed__
));
293 /* tag for the radix tree of block groups in ram */
294 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
297 #define BTRFS_BLOCK_GROUP_DATA 1
298 #define BTRFS_BLOCK_GROUP_MIXED 2
300 struct btrfs_block_group_item
{
303 } __attribute__ ((__packed__
));
305 struct btrfs_block_group_cache
{
306 struct btrfs_key key
;
307 struct btrfs_block_group_item item
;
312 struct btrfs_fs_info
{
313 u8 fsid
[BTRFS_FSID_SIZE
];
314 struct btrfs_root
*extent_root
;
315 struct btrfs_root
*tree_root
;
316 struct radix_tree_root fs_roots_radix
;
318 struct extent_io_tree free_space_cache
;
319 struct extent_io_tree block_group_cache
;
320 struct extent_io_tree pinned_extents
;
321 struct extent_io_tree pending_del
;
322 struct extent_io_tree extent_ins
;
325 u64 last_trans_committed
;
326 unsigned long mount_opt
;
329 struct btrfs_transaction
*running_transaction
;
330 struct btrfs_super_block super_copy
;
331 struct extent_buffer
*sb_buffer
;
332 struct super_block
*sb
;
333 struct inode
*btree_inode
;
334 spinlock_t hash_lock
;
335 struct mutex trans_mutex
;
336 struct mutex fs_mutex
;
337 struct list_head trans_list
;
338 struct list_head hashers
;
339 struct list_head dead_roots
;
340 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
341 struct work_struct trans_work
;
343 struct delayed_work trans_work
;
345 struct kobject super_kobj
;
346 struct completion kobj_unregister
;
349 unsigned long throttles
;
352 spinlock_t delalloc_lock
;
353 spinlock_t new_trans_lock
;
358 * in ram representation of the tree. extent_root is used for all allocations
359 * and for the extent tree extent_root root.
362 struct extent_buffer
*node
;
363 struct extent_buffer
*commit_root
;
364 struct btrfs_root_item root_item
;
365 struct btrfs_key root_key
;
366 struct btrfs_fs_info
*fs_info
;
368 struct kobject root_kobj
;
369 struct completion kobj_unregister
;
373 /* data allocations are done in sectorsize units */
376 /* node allocations are done in nodesize units */
379 /* leaf allocations are done in leafsize units */
386 u64 last_inode_alloc
;
388 struct btrfs_key defrag_progress
;
396 * inode items have the data typically returned from stat and store other
397 * info about object characteristics. There is one for every file and dir in
400 #define BTRFS_INODE_ITEM_KEY 1
401 #define BTRFS_INODE_REF_KEY 2
402 #define BTRFS_XATTR_ITEM_KEY 8
403 /* reserve 2-15 close to the inode for later flexibility */
406 * dir items are the name -> inode pointers in a directory. There is one
407 * for every name in a directory.
409 #define BTRFS_DIR_ITEM_KEY 16
410 #define BTRFS_DIR_INDEX_KEY 17
412 * extent data is for file data
414 #define BTRFS_EXTENT_DATA_KEY 18
416 * csum items have the checksums for data in the extents
418 #define BTRFS_CSUM_ITEM_KEY 19
420 /* reserve 20-31 for other file stuff */
423 * root items point to tree roots. There are typically in the root
424 * tree used by the super block to find all the other trees
426 #define BTRFS_ROOT_ITEM_KEY 32
428 * extent items are in the extent map tree. These record which blocks
429 * are used, and how many references there are to each block
431 #define BTRFS_EXTENT_ITEM_KEY 33
432 #define BTRFS_EXTENT_REF_KEY 34
435 * block groups give us hints into the extent allocation trees. Which
436 * blocks are free etc etc
438 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
441 * string items are for debugging. They just store a short string of
444 #define BTRFS_STRING_ITEM_KEY 253
446 #define BTRFS_MOUNT_NODATASUM (1 << 0)
447 #define BTRFS_MOUNT_NODATACOW (1 << 1)
448 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
449 #define BTRFS_MOUNT_SSD (1 << 3)
451 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
452 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
453 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
458 #define BTRFS_INODE_NODATASUM (1 << 0)
459 #define BTRFS_INODE_NODATACOW (1 << 1)
460 #define BTRFS_INODE_READONLY (1 << 2)
461 #define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
463 #define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
465 #define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \
467 /* some macros to generate set/get funcs for the struct fields. This
468 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
471 #define le8_to_cpu(v) (v)
472 #define cpu_to_le8(v) (v)
475 #define read_eb_member(eb, ptr, type, member, result) ( \
476 read_extent_buffer(eb, (char *)(result), \
477 ((unsigned long)(ptr)) + \
478 offsetof(type, member), \
479 sizeof(((type *)0)->member)))
481 #define write_eb_member(eb, ptr, type, member, result) ( \
482 write_extent_buffer(eb, (char *)(result), \
483 ((unsigned long)(ptr)) + \
484 offsetof(type, member), \
485 sizeof(((type *)0)->member)))
487 #ifndef BTRFS_SETGET_FUNCS
488 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
489 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
490 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
493 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
494 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
496 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
497 unsigned long offset = offsetof(type, member); \
499 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
500 res = le##bits##_to_cpu(*tmp); \
501 kunmap_atomic(kaddr, KM_USER0); \
504 static inline void btrfs_set_##name(struct extent_buffer *eb, \
507 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
508 unsigned long offset = offsetof(type, member); \
509 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
510 *tmp = cpu_to_le##bits(val); \
511 kunmap_atomic(kaddr, KM_USER0); \
514 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
515 static inline u##bits btrfs_##name(type *s) \
517 return le##bits##_to_cpu(s->member); \
519 static inline void btrfs_set_##name(type *s, u##bits val) \
521 s->member = cpu_to_le##bits(val); \
524 /* struct btrfs_block_group_item */
525 BTRFS_SETGET_STACK_FUNCS(block_group_used
, struct btrfs_block_group_item
,
527 BTRFS_SETGET_FUNCS(disk_block_group_used
, struct btrfs_block_group_item
,
529 BTRFS_SETGET_FUNCS(disk_block_group_flags
, struct btrfs_block_group_item
,
532 /* struct btrfs_inode_ref */
533 BTRFS_SETGET_FUNCS(inode_ref_name_len
, struct btrfs_inode_ref
, name_len
, 16);
535 /* struct btrfs_inode_item */
536 BTRFS_SETGET_FUNCS(inode_generation
, struct btrfs_inode_item
, generation
, 64);
537 BTRFS_SETGET_FUNCS(inode_size
, struct btrfs_inode_item
, size
, 64);
538 BTRFS_SETGET_FUNCS(inode_nblocks
, struct btrfs_inode_item
, nblocks
, 64);
539 BTRFS_SETGET_FUNCS(inode_block_group
, struct btrfs_inode_item
, block_group
, 64);
540 BTRFS_SETGET_FUNCS(inode_nlink
, struct btrfs_inode_item
, nlink
, 32);
541 BTRFS_SETGET_FUNCS(inode_uid
, struct btrfs_inode_item
, uid
, 32);
542 BTRFS_SETGET_FUNCS(inode_gid
, struct btrfs_inode_item
, gid
, 32);
543 BTRFS_SETGET_FUNCS(inode_mode
, struct btrfs_inode_item
, mode
, 32);
544 BTRFS_SETGET_FUNCS(inode_rdev
, struct btrfs_inode_item
, rdev
, 32);
545 BTRFS_SETGET_FUNCS(inode_flags
, struct btrfs_inode_item
, flags
, 16);
546 BTRFS_SETGET_FUNCS(inode_compat_flags
, struct btrfs_inode_item
,
549 static inline struct btrfs_inode_timespec
*
550 btrfs_inode_atime(struct btrfs_inode_item
*inode_item
)
552 unsigned long ptr
= (unsigned long)inode_item
;
553 ptr
+= offsetof(struct btrfs_inode_item
, atime
);
554 return (struct btrfs_inode_timespec
*)ptr
;
557 static inline struct btrfs_inode_timespec
*
558 btrfs_inode_mtime(struct btrfs_inode_item
*inode_item
)
560 unsigned long ptr
= (unsigned long)inode_item
;
561 ptr
+= offsetof(struct btrfs_inode_item
, mtime
);
562 return (struct btrfs_inode_timespec
*)ptr
;
565 static inline struct btrfs_inode_timespec
*
566 btrfs_inode_ctime(struct btrfs_inode_item
*inode_item
)
568 unsigned long ptr
= (unsigned long)inode_item
;
569 ptr
+= offsetof(struct btrfs_inode_item
, ctime
);
570 return (struct btrfs_inode_timespec
*)ptr
;
573 static inline struct btrfs_inode_timespec
*
574 btrfs_inode_otime(struct btrfs_inode_item
*inode_item
)
576 unsigned long ptr
= (unsigned long)inode_item
;
577 ptr
+= offsetof(struct btrfs_inode_item
, otime
);
578 return (struct btrfs_inode_timespec
*)ptr
;
581 BTRFS_SETGET_FUNCS(timespec_sec
, struct btrfs_inode_timespec
, sec
, 64);
582 BTRFS_SETGET_FUNCS(timespec_nsec
, struct btrfs_inode_timespec
, nsec
, 32);
584 /* struct btrfs_extent_item */
585 BTRFS_SETGET_FUNCS(extent_refs
, struct btrfs_extent_item
, refs
, 32);
587 /* struct btrfs_extent_ref */
588 BTRFS_SETGET_FUNCS(ref_root
, struct btrfs_extent_ref
, root
, 64);
589 BTRFS_SETGET_FUNCS(ref_generation
, struct btrfs_extent_ref
, generation
, 64);
590 BTRFS_SETGET_FUNCS(ref_objectid
, struct btrfs_extent_ref
, objectid
, 64);
591 BTRFS_SETGET_FUNCS(ref_offset
, struct btrfs_extent_ref
, offset
, 64);
593 BTRFS_SETGET_STACK_FUNCS(stack_ref_root
, struct btrfs_extent_ref
, root
, 64);
594 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation
, struct btrfs_extent_ref
,
596 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid
, struct btrfs_extent_ref
,
598 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset
, struct btrfs_extent_ref
, offset
, 64);
600 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs
, struct btrfs_extent_item
,
603 /* struct btrfs_node */
604 BTRFS_SETGET_FUNCS(key_blockptr
, struct btrfs_key_ptr
, blockptr
, 64);
605 BTRFS_SETGET_FUNCS(key_generation
, struct btrfs_key_ptr
, generation
, 64);
607 static inline u64
btrfs_node_blockptr(struct extent_buffer
*eb
, int nr
)
610 ptr
= offsetof(struct btrfs_node
, ptrs
) +
611 sizeof(struct btrfs_key_ptr
) * nr
;
612 return btrfs_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
);
615 static inline void btrfs_set_node_blockptr(struct extent_buffer
*eb
,
619 ptr
= offsetof(struct btrfs_node
, ptrs
) +
620 sizeof(struct btrfs_key_ptr
) * nr
;
621 btrfs_set_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
624 static inline u64
btrfs_node_ptr_generation(struct extent_buffer
*eb
, int nr
)
627 ptr
= offsetof(struct btrfs_node
, ptrs
) +
628 sizeof(struct btrfs_key_ptr
) * nr
;
629 return btrfs_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
);
632 static inline void btrfs_set_node_ptr_generation(struct extent_buffer
*eb
,
636 ptr
= offsetof(struct btrfs_node
, ptrs
) +
637 sizeof(struct btrfs_key_ptr
) * nr
;
638 btrfs_set_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
641 static inline unsigned long btrfs_node_key_ptr_offset(int nr
)
643 return offsetof(struct btrfs_node
, ptrs
) +
644 sizeof(struct btrfs_key_ptr
) * nr
;
647 void btrfs_node_key(struct extent_buffer
*eb
,
648 struct btrfs_disk_key
*disk_key
, int nr
);
650 static inline void btrfs_set_node_key(struct extent_buffer
*eb
,
651 struct btrfs_disk_key
*disk_key
, int nr
)
654 ptr
= btrfs_node_key_ptr_offset(nr
);
655 write_eb_member(eb
, (struct btrfs_key_ptr
*)ptr
,
656 struct btrfs_key_ptr
, key
, disk_key
);
659 /* struct btrfs_item */
660 BTRFS_SETGET_FUNCS(item_offset
, struct btrfs_item
, offset
, 32);
661 BTRFS_SETGET_FUNCS(item_size
, struct btrfs_item
, size
, 32);
663 static inline unsigned long btrfs_item_nr_offset(int nr
)
665 return offsetof(struct btrfs_leaf
, items
) +
666 sizeof(struct btrfs_item
) * nr
;
669 static inline struct btrfs_item
*btrfs_item_nr(struct extent_buffer
*eb
,
672 return (struct btrfs_item
*)btrfs_item_nr_offset(nr
);
675 static inline u32
btrfs_item_end(struct extent_buffer
*eb
,
676 struct btrfs_item
*item
)
678 return btrfs_item_offset(eb
, item
) + btrfs_item_size(eb
, item
);
681 static inline u32
btrfs_item_end_nr(struct extent_buffer
*eb
, int nr
)
683 return btrfs_item_end(eb
, btrfs_item_nr(eb
, nr
));
686 static inline u32
btrfs_item_offset_nr(struct extent_buffer
*eb
, int nr
)
688 return btrfs_item_offset(eb
, btrfs_item_nr(eb
, nr
));
691 static inline u32
btrfs_item_size_nr(struct extent_buffer
*eb
, int nr
)
693 return btrfs_item_size(eb
, btrfs_item_nr(eb
, nr
));
696 static inline void btrfs_item_key(struct extent_buffer
*eb
,
697 struct btrfs_disk_key
*disk_key
, int nr
)
699 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
700 read_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
703 static inline void btrfs_set_item_key(struct extent_buffer
*eb
,
704 struct btrfs_disk_key
*disk_key
, int nr
)
706 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
707 write_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
710 /* struct btrfs_dir_item */
711 BTRFS_SETGET_FUNCS(dir_data_len
, struct btrfs_dir_item
, data_len
, 16);
712 BTRFS_SETGET_FUNCS(dir_type
, struct btrfs_dir_item
, type
, 8);
713 BTRFS_SETGET_FUNCS(dir_name_len
, struct btrfs_dir_item
, name_len
, 16);
715 static inline void btrfs_dir_item_key(struct extent_buffer
*eb
,
716 struct btrfs_dir_item
*item
,
717 struct btrfs_disk_key
*key
)
719 read_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
722 static inline void btrfs_set_dir_item_key(struct extent_buffer
*eb
,
723 struct btrfs_dir_item
*item
,
724 struct btrfs_disk_key
*key
)
726 write_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
729 /* struct btrfs_disk_key */
730 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid
, struct btrfs_disk_key
,
732 BTRFS_SETGET_STACK_FUNCS(disk_key_offset
, struct btrfs_disk_key
, offset
, 64);
733 BTRFS_SETGET_STACK_FUNCS(disk_key_type
, struct btrfs_disk_key
, type
, 8);
735 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
736 struct btrfs_disk_key
*disk
)
738 cpu
->offset
= le64_to_cpu(disk
->offset
);
739 cpu
->type
= disk
->type
;
740 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
743 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
744 struct btrfs_key
*cpu
)
746 disk
->offset
= cpu_to_le64(cpu
->offset
);
747 disk
->type
= cpu
->type
;
748 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
751 static inline void btrfs_node_key_to_cpu(struct extent_buffer
*eb
,
752 struct btrfs_key
*key
, int nr
)
754 struct btrfs_disk_key disk_key
;
755 btrfs_node_key(eb
, &disk_key
, nr
);
756 btrfs_disk_key_to_cpu(key
, &disk_key
);
759 static inline void btrfs_item_key_to_cpu(struct extent_buffer
*eb
,
760 struct btrfs_key
*key
, int nr
)
762 struct btrfs_disk_key disk_key
;
763 btrfs_item_key(eb
, &disk_key
, nr
);
764 btrfs_disk_key_to_cpu(key
, &disk_key
);
767 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer
*eb
,
768 struct btrfs_dir_item
*item
,
769 struct btrfs_key
*key
)
771 struct btrfs_disk_key disk_key
;
772 btrfs_dir_item_key(eb
, item
, &disk_key
);
773 btrfs_disk_key_to_cpu(key
, &disk_key
);
777 static inline u8
btrfs_key_type(struct btrfs_key
*key
)
782 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u8 val
)
787 /* struct btrfs_header */
788 BTRFS_SETGET_HEADER_FUNCS(header_bytenr
, struct btrfs_header
, bytenr
, 64);
789 BTRFS_SETGET_HEADER_FUNCS(header_generation
, struct btrfs_header
,
791 BTRFS_SETGET_HEADER_FUNCS(header_owner
, struct btrfs_header
, owner
, 64);
792 BTRFS_SETGET_HEADER_FUNCS(header_nritems
, struct btrfs_header
, nritems
, 32);
793 BTRFS_SETGET_HEADER_FUNCS(header_flags
, struct btrfs_header
, flags
, 16);
794 BTRFS_SETGET_HEADER_FUNCS(header_level
, struct btrfs_header
, level
, 8);
796 static inline u8
*btrfs_header_fsid(struct extent_buffer
*eb
)
798 unsigned long ptr
= offsetof(struct btrfs_header
, fsid
);
802 static inline u8
*btrfs_super_fsid(struct extent_buffer
*eb
)
804 unsigned long ptr
= offsetof(struct btrfs_super_block
, fsid
);
808 static inline u8
*btrfs_header_csum(struct extent_buffer
*eb
)
810 unsigned long ptr
= offsetof(struct btrfs_header
, csum
);
814 static inline struct btrfs_node
*btrfs_buffer_node(struct extent_buffer
*eb
)
819 static inline struct btrfs_leaf
*btrfs_buffer_leaf(struct extent_buffer
*eb
)
824 static inline struct btrfs_header
*btrfs_buffer_header(struct extent_buffer
*eb
)
829 static inline int btrfs_is_leaf(struct extent_buffer
*eb
)
831 return (btrfs_header_level(eb
) == 0);
834 /* struct btrfs_root_item */
835 BTRFS_SETGET_FUNCS(disk_root_refs
, struct btrfs_root_item
, refs
, 32);
836 BTRFS_SETGET_FUNCS(disk_root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
837 BTRFS_SETGET_FUNCS(disk_root_level
, struct btrfs_root_item
, level
, 8);
839 BTRFS_SETGET_STACK_FUNCS(root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
840 BTRFS_SETGET_STACK_FUNCS(root_level
, struct btrfs_root_item
, level
, 8);
841 BTRFS_SETGET_STACK_FUNCS(root_dirid
, struct btrfs_root_item
, root_dirid
, 64);
842 BTRFS_SETGET_STACK_FUNCS(root_refs
, struct btrfs_root_item
, refs
, 32);
843 BTRFS_SETGET_STACK_FUNCS(root_flags
, struct btrfs_root_item
, flags
, 32);
844 BTRFS_SETGET_STACK_FUNCS(root_used
, struct btrfs_root_item
, bytes_used
, 64);
845 BTRFS_SETGET_STACK_FUNCS(root_limit
, struct btrfs_root_item
, byte_limit
, 64);
847 /* struct btrfs_super_block */
848 BTRFS_SETGET_STACK_FUNCS(super_bytenr
, struct btrfs_super_block
, bytenr
, 64);
849 BTRFS_SETGET_STACK_FUNCS(super_generation
, struct btrfs_super_block
,
851 BTRFS_SETGET_STACK_FUNCS(super_root
, struct btrfs_super_block
, root
, 64);
852 BTRFS_SETGET_STACK_FUNCS(super_root_level
, struct btrfs_super_block
,
854 BTRFS_SETGET_STACK_FUNCS(super_total_bytes
, struct btrfs_super_block
,
856 BTRFS_SETGET_STACK_FUNCS(super_bytes_used
, struct btrfs_super_block
,
858 BTRFS_SETGET_STACK_FUNCS(super_sectorsize
, struct btrfs_super_block
,
860 BTRFS_SETGET_STACK_FUNCS(super_nodesize
, struct btrfs_super_block
,
862 BTRFS_SETGET_STACK_FUNCS(super_leafsize
, struct btrfs_super_block
,
864 BTRFS_SETGET_STACK_FUNCS(super_stripesize
, struct btrfs_super_block
,
866 BTRFS_SETGET_STACK_FUNCS(super_root_dir
, struct btrfs_super_block
,
867 root_dir_objectid
, 64);
869 static inline unsigned long btrfs_leaf_data(struct extent_buffer
*l
)
871 return offsetof(struct btrfs_leaf
, items
);
874 /* struct btrfs_file_extent_item */
875 BTRFS_SETGET_FUNCS(file_extent_type
, struct btrfs_file_extent_item
, type
, 8);
877 static inline unsigned long btrfs_file_extent_inline_start(struct
878 btrfs_file_extent_item
*e
)
880 unsigned long offset
= (unsigned long)e
;
881 offset
+= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
885 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
887 return offsetof(struct btrfs_file_extent_item
, disk_bytenr
) + datasize
;
890 static inline u32
btrfs_file_extent_inline_len(struct extent_buffer
*eb
,
891 struct btrfs_item
*e
)
893 unsigned long offset
;
894 offset
= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
895 return btrfs_item_size(eb
, e
) - offset
;
898 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr
, struct btrfs_file_extent_item
,
900 BTRFS_SETGET_FUNCS(file_extent_generation
, struct btrfs_file_extent_item
,
902 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes
, struct btrfs_file_extent_item
,
904 BTRFS_SETGET_FUNCS(file_extent_offset
, struct btrfs_file_extent_item
,
906 BTRFS_SETGET_FUNCS(file_extent_num_bytes
, struct btrfs_file_extent_item
,
909 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
911 return sb
->s_fs_info
;
914 static inline int btrfs_set_root_name(struct btrfs_root
*root
,
915 const char *name
, int len
)
917 /* if we already have a name just free it */
921 root
->name
= kmalloc(len
+1, GFP_KERNEL
);
925 memcpy(root
->name
, name
, len
);
926 root
->name
[len
] ='\0';
931 static inline u32
btrfs_level_size(struct btrfs_root
*root
, int level
) {
933 return root
->leafsize
;
934 return root
->nodesize
;
937 /* helper function to cast into the data area of the leaf. */
938 #define btrfs_item_ptr(leaf, slot, type) \
939 ((type *)(btrfs_leaf_data(leaf) + \
940 btrfs_item_offset_nr(leaf, slot)))
942 #define btrfs_item_ptr_offset(leaf, slot) \
943 ((unsigned long)(btrfs_leaf_data(leaf) + \
944 btrfs_item_offset_nr(leaf, slot)))
946 static inline struct dentry
*fdentry(struct file
*file
) {
947 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
948 return file
->f_dentry
;
950 return file
->f_path
.dentry
;
955 u32
btrfs_count_snapshots_in_path(struct btrfs_root
*root
,
956 struct btrfs_path
*count_path
,
958 int btrfs_extent_post_op(struct btrfs_trans_handle
*trans
,
959 struct btrfs_root
*root
);
960 int btrfs_copy_pinned(struct btrfs_root
*root
, struct extent_io_tree
*copy
);
961 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
964 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
965 struct btrfs_block_group_cache
966 *hint
, u64 search_start
,
967 int data
, int owner
);
968 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
969 struct btrfs_root
*root
, u64 owner_objectid
);
970 struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
971 struct btrfs_root
*root
, u32 size
,
973 u64 hint
, u64 empty_size
);
974 struct extent_buffer
*__btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
975 struct btrfs_root
*root
,
983 int btrfs_grow_extent_tree(struct btrfs_trans_handle
*trans
,
984 struct btrfs_root
*root
, u64 new_size
);
985 int btrfs_shrink_extent_tree(struct btrfs_root
*root
, u64 new_size
);
986 int btrfs_insert_extent_backref(struct btrfs_trans_handle
*trans
,
987 struct btrfs_root
*root
,
988 struct btrfs_path
*path
, u64 bytenr
,
989 u64 root_objectid
, u64 ref_generation
,
990 u64 owner
, u64 owner_offset
);
991 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
992 struct btrfs_root
*root
,
993 u64 num_bytes
, u64 root_objectid
, u64 ref_generation
,
994 u64 owner
, u64 owner_offset
,
995 u64 empty_size
, u64 hint_byte
,
996 u64 search_end
, struct btrfs_key
*ins
, int data
);
997 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
998 struct extent_buffer
*buf
);
999 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
1000 *root
, u64 bytenr
, u64 num_bytes
,
1001 u64 root_objectid
, u64 ref_generation
,
1002 u64 owner_objectid
, u64 owner_offset
, int pin
);
1003 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
1004 struct btrfs_root
*root
,
1005 struct extent_io_tree
*unpin
);
1006 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1007 struct btrfs_root
*root
,
1008 u64 bytenr
, u64 num_bytes
,
1009 u64 root_objectid
, u64 ref_generation
,
1010 u64 owner
, u64 owner_offset
);
1011 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
1012 struct btrfs_root
*root
);
1013 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
1014 int btrfs_read_block_groups(struct btrfs_root
*root
);
1016 int btrfs_cow_block(struct btrfs_trans_handle
*trans
,
1017 struct btrfs_root
*root
, struct extent_buffer
*buf
,
1018 struct extent_buffer
*parent
, int parent_slot
,
1019 struct extent_buffer
**cow_ret
);
1020 int btrfs_copy_root(struct btrfs_trans_handle
*trans
,
1021 struct btrfs_root
*root
,
1022 struct extent_buffer
*buf
,
1023 struct extent_buffer
**cow_ret
, u64 new_root_objectid
);
1024 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1025 *root
, struct btrfs_path
*path
, u32 data_size
);
1026 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
1027 struct btrfs_root
*root
,
1028 struct btrfs_path
*path
,
1029 u32 new_size
, int from_end
);
1030 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1031 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
1033 int btrfs_realloc_node(struct btrfs_trans_handle
*trans
,
1034 struct btrfs_root
*root
, struct extent_buffer
*parent
,
1035 int start_slot
, int cache_only
, u64
*last_ret
,
1036 struct btrfs_key
*progress
);
1037 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
1038 struct btrfs_path
*btrfs_alloc_path(void);
1039 void btrfs_free_path(struct btrfs_path
*p
);
1040 void btrfs_init_path(struct btrfs_path
*p
);
1041 int btrfs_del_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1042 struct btrfs_path
*path
);
1043 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1044 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1045 int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1046 *root
, struct btrfs_path
*path
, struct btrfs_key
1047 *cpu_key
, u32 data_size
);
1048 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1049 int btrfs_prev_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1050 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct extent_buffer
*leaf
);
1051 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1054 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1055 struct btrfs_key
*key
);
1056 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1057 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1059 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1060 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1062 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1063 btrfs_root_item
*item
, struct btrfs_key
*key
);
1064 int btrfs_find_dead_roots(struct btrfs_root
*root
, u64 objectid
,
1065 struct btrfs_root
*latest_root
);
1067 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1068 *root
, const char *name
, int name_len
, u64 dir
,
1069 struct btrfs_key
*location
, u8 type
);
1070 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1071 struct btrfs_root
*root
,
1072 struct btrfs_path
*path
, u64 dir
,
1073 const char *name
, int name_len
,
1075 struct btrfs_dir_item
*
1076 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1077 struct btrfs_root
*root
,
1078 struct btrfs_path
*path
, u64 dir
,
1079 u64 objectid
, const char *name
, int name_len
,
1081 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1082 struct btrfs_path
*path
,
1083 const char *name
, int name_len
);
1084 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1085 struct btrfs_root
*root
,
1086 struct btrfs_path
*path
,
1087 struct btrfs_dir_item
*di
);
1088 int btrfs_insert_xattr_item(struct btrfs_trans_handle
*trans
,
1089 struct btrfs_root
*root
, const char *name
,
1090 u16 name_len
, const void *data
, u16 data_len
,
1092 struct btrfs_dir_item
*btrfs_lookup_xattr(struct btrfs_trans_handle
*trans
,
1093 struct btrfs_root
*root
,
1094 struct btrfs_path
*path
, u64 dir
,
1095 const char *name
, u16 name_len
,
1098 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1099 struct btrfs_root
*fs_root
,
1100 u64 dirid
, u64
*objectid
);
1101 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1104 int btrfs_insert_inode_ref(struct btrfs_trans_handle
*trans
,
1105 struct btrfs_root
*root
,
1106 const char *name
, int name_len
,
1107 u64 inode_objectid
, u64 ref_objectid
);
1108 int btrfs_del_inode_ref(struct btrfs_trans_handle
*trans
,
1109 struct btrfs_root
*root
,
1110 const char *name
, int name_len
,
1111 u64 inode_objectid
, u64 ref_objectid
);
1112 int btrfs_insert_empty_inode(struct btrfs_trans_handle
*trans
,
1113 struct btrfs_root
*root
,
1114 struct btrfs_path
*path
, u64 objectid
);
1115 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1116 *root
, struct btrfs_path
*path
,
1117 struct btrfs_key
*location
, int mod
);
1120 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1121 struct btrfs_root
*root
,
1122 u64 objectid
, u64 pos
, u64 offset
,
1125 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1126 struct btrfs_root
*root
,
1127 struct btrfs_path
*path
, u64 objectid
,
1128 u64 bytenr
, int mod
);
1129 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1130 struct btrfs_root
*root
,
1131 struct inode
*inode
,
1132 u64 objectid
, u64 offset
,
1133 char *data
, size_t len
);
1134 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1135 struct btrfs_root
*root
,
1136 struct btrfs_path
*path
,
1137 u64 objectid
, u64 offset
,
1139 int btrfs_csum_truncate(struct btrfs_trans_handle
*trans
,
1140 struct btrfs_root
*root
, struct btrfs_path
*path
,
1143 unsigned long btrfs_force_ra(struct address_space
*mapping
,
1144 struct file_ra_state
*ra
, struct file
*file
,
1145 pgoff_t offset
, pgoff_t last_index
);
1146 int btrfs_check_free_space(struct btrfs_root
*root
, u64 num_required
,
1148 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1149 int btrfs_readpage(struct file
*file
, struct page
*page
);
1150 void btrfs_delete_inode(struct inode
*inode
);
1151 void btrfs_put_inode(struct inode
*inode
);
1152 void btrfs_read_locked_inode(struct inode
*inode
);
1153 int btrfs_write_inode(struct inode
*inode
, int wait
);
1154 void btrfs_dirty_inode(struct inode
*inode
);
1155 struct inode
*btrfs_alloc_inode(struct super_block
*sb
);
1156 void btrfs_destroy_inode(struct inode
*inode
);
1157 int btrfs_init_cachep(void);
1158 void btrfs_destroy_cachep(void);
1159 long btrfs_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
1160 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1161 struct btrfs_root
*root
);
1162 struct inode
*btrfs_ilookup(struct super_block
*s
, u64 objectid
,
1164 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1165 unsigned from
, unsigned to
);
1166 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1167 size_t page_offset
, u64 start
, u64 end
,
1169 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
1170 struct btrfs_root
*root
,
1171 struct inode
*inode
);
1173 int btrfs_drop_extent_cache(struct inode
*inode
, u64 start
, u64 end
);
1174 int btrfs_check_file(struct btrfs_root
*root
, struct inode
*inode
);
1175 extern struct file_operations btrfs_file_operations
;
1176 int btrfs_drop_extents(struct btrfs_trans_handle
*trans
,
1177 struct btrfs_root
*root
, struct inode
*inode
,
1178 u64 start
, u64 end
, u64 inline_limit
, u64
*hint_block
);
1180 int btrfs_defrag_leaves(struct btrfs_trans_handle
*trans
,
1181 struct btrfs_root
*root
, int cache_only
);
1184 int btrfs_init_sysfs(void);
1185 void btrfs_exit_sysfs(void);
1186 int btrfs_sysfs_add_super(struct btrfs_fs_info
*fs
);
1187 int btrfs_sysfs_add_root(struct btrfs_root
*root
);
1188 void btrfs_sysfs_del_root(struct btrfs_root
*root
);
1189 void btrfs_sysfs_del_super(struct btrfs_fs_info
*root
);
1192 ssize_t
btrfs_listxattr(struct dentry
*dentry
, char *buffer
, size_t size
);
1193 int btrfs_delete_xattrs(struct btrfs_trans_handle
*trans
,
1194 struct btrfs_root
*root
, struct inode
*inode
);
1196 u64
btrfs_parse_size(char *str
);