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
;
330 struct btrfs_transaction
*running_transaction
;
331 struct btrfs_super_block super_copy
;
332 struct extent_buffer
*sb_buffer
;
333 struct super_block
*sb
;
334 struct inode
*btree_inode
;
335 spinlock_t hash_lock
;
336 struct mutex trans_mutex
;
337 struct mutex fs_mutex
;
338 struct list_head trans_list
;
339 struct list_head hashers
;
340 struct list_head dead_roots
;
341 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
342 struct work_struct trans_work
;
344 struct delayed_work trans_work
;
346 struct kobject super_kobj
;
347 struct completion kobj_unregister
;
350 unsigned long throttles
;
353 spinlock_t delalloc_lock
;
354 spinlock_t new_trans_lock
;
359 * in ram representation of the tree. extent_root is used for all allocations
360 * and for the extent tree extent_root root.
363 struct extent_buffer
*node
;
364 struct extent_buffer
*commit_root
;
365 struct btrfs_root_item root_item
;
366 struct btrfs_key root_key
;
367 struct btrfs_fs_info
*fs_info
;
369 struct kobject root_kobj
;
370 struct completion kobj_unregister
;
374 /* data allocations are done in sectorsize units */
377 /* node allocations are done in nodesize units */
380 /* leaf allocations are done in leafsize units */
387 u64 last_inode_alloc
;
389 struct btrfs_key defrag_progress
;
397 * inode items have the data typically returned from stat and store other
398 * info about object characteristics. There is one for every file and dir in
401 #define BTRFS_INODE_ITEM_KEY 1
402 #define BTRFS_INODE_REF_KEY 2
403 #define BTRFS_XATTR_ITEM_KEY 8
404 /* reserve 2-15 close to the inode for later flexibility */
407 * dir items are the name -> inode pointers in a directory. There is one
408 * for every name in a directory.
410 #define BTRFS_DIR_ITEM_KEY 16
411 #define BTRFS_DIR_INDEX_KEY 17
413 * extent data is for file data
415 #define BTRFS_EXTENT_DATA_KEY 18
417 * csum items have the checksums for data in the extents
419 #define BTRFS_CSUM_ITEM_KEY 19
421 /* reserve 20-31 for other file stuff */
424 * root items point to tree roots. There are typically in the root
425 * tree used by the super block to find all the other trees
427 #define BTRFS_ROOT_ITEM_KEY 32
429 * extent items are in the extent map tree. These record which blocks
430 * are used, and how many references there are to each block
432 #define BTRFS_EXTENT_ITEM_KEY 33
433 #define BTRFS_EXTENT_REF_KEY 34
436 * block groups give us hints into the extent allocation trees. Which
437 * blocks are free etc etc
439 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
442 * string items are for debugging. They just store a short string of
445 #define BTRFS_STRING_ITEM_KEY 253
447 #define BTRFS_MOUNT_NODATASUM (1 << 0)
448 #define BTRFS_MOUNT_NODATACOW (1 << 1)
449 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
450 #define BTRFS_MOUNT_SSD (1 << 3)
452 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
453 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
454 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
459 #define BTRFS_INODE_NODATASUM (1 << 0)
460 #define BTRFS_INODE_NODATACOW (1 << 1)
461 #define BTRFS_INODE_READONLY (1 << 2)
462 #define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
464 #define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
466 #define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \
468 /* some macros to generate set/get funcs for the struct fields. This
469 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
472 #define le8_to_cpu(v) (v)
473 #define cpu_to_le8(v) (v)
476 #define read_eb_member(eb, ptr, type, member, result) ( \
477 read_extent_buffer(eb, (char *)(result), \
478 ((unsigned long)(ptr)) + \
479 offsetof(type, member), \
480 sizeof(((type *)0)->member)))
482 #define write_eb_member(eb, ptr, type, member, result) ( \
483 write_extent_buffer(eb, (char *)(result), \
484 ((unsigned long)(ptr)) + \
485 offsetof(type, member), \
486 sizeof(((type *)0)->member)))
488 #ifndef BTRFS_SETGET_FUNCS
489 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
490 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
491 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
494 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
495 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
497 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
498 unsigned long offset = offsetof(type, member); \
500 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
501 res = le##bits##_to_cpu(*tmp); \
502 kunmap_atomic(kaddr, KM_USER0); \
505 static inline void btrfs_set_##name(struct extent_buffer *eb, \
508 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
509 unsigned long offset = offsetof(type, member); \
510 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
511 *tmp = cpu_to_le##bits(val); \
512 kunmap_atomic(kaddr, KM_USER0); \
515 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
516 static inline u##bits btrfs_##name(type *s) \
518 return le##bits##_to_cpu(s->member); \
520 static inline void btrfs_set_##name(type *s, u##bits val) \
522 s->member = cpu_to_le##bits(val); \
525 /* struct btrfs_block_group_item */
526 BTRFS_SETGET_STACK_FUNCS(block_group_used
, struct btrfs_block_group_item
,
528 BTRFS_SETGET_FUNCS(disk_block_group_used
, struct btrfs_block_group_item
,
530 BTRFS_SETGET_FUNCS(disk_block_group_flags
, struct btrfs_block_group_item
,
533 /* struct btrfs_inode_ref */
534 BTRFS_SETGET_FUNCS(inode_ref_name_len
, struct btrfs_inode_ref
, name_len
, 16);
536 /* struct btrfs_inode_item */
537 BTRFS_SETGET_FUNCS(inode_generation
, struct btrfs_inode_item
, generation
, 64);
538 BTRFS_SETGET_FUNCS(inode_size
, struct btrfs_inode_item
, size
, 64);
539 BTRFS_SETGET_FUNCS(inode_nblocks
, struct btrfs_inode_item
, nblocks
, 64);
540 BTRFS_SETGET_FUNCS(inode_block_group
, struct btrfs_inode_item
, block_group
, 64);
541 BTRFS_SETGET_FUNCS(inode_nlink
, struct btrfs_inode_item
, nlink
, 32);
542 BTRFS_SETGET_FUNCS(inode_uid
, struct btrfs_inode_item
, uid
, 32);
543 BTRFS_SETGET_FUNCS(inode_gid
, struct btrfs_inode_item
, gid
, 32);
544 BTRFS_SETGET_FUNCS(inode_mode
, struct btrfs_inode_item
, mode
, 32);
545 BTRFS_SETGET_FUNCS(inode_rdev
, struct btrfs_inode_item
, rdev
, 32);
546 BTRFS_SETGET_FUNCS(inode_flags
, struct btrfs_inode_item
, flags
, 16);
547 BTRFS_SETGET_FUNCS(inode_compat_flags
, struct btrfs_inode_item
,
550 static inline struct btrfs_inode_timespec
*
551 btrfs_inode_atime(struct btrfs_inode_item
*inode_item
)
553 unsigned long ptr
= (unsigned long)inode_item
;
554 ptr
+= offsetof(struct btrfs_inode_item
, atime
);
555 return (struct btrfs_inode_timespec
*)ptr
;
558 static inline struct btrfs_inode_timespec
*
559 btrfs_inode_mtime(struct btrfs_inode_item
*inode_item
)
561 unsigned long ptr
= (unsigned long)inode_item
;
562 ptr
+= offsetof(struct btrfs_inode_item
, mtime
);
563 return (struct btrfs_inode_timespec
*)ptr
;
566 static inline struct btrfs_inode_timespec
*
567 btrfs_inode_ctime(struct btrfs_inode_item
*inode_item
)
569 unsigned long ptr
= (unsigned long)inode_item
;
570 ptr
+= offsetof(struct btrfs_inode_item
, ctime
);
571 return (struct btrfs_inode_timespec
*)ptr
;
574 static inline struct btrfs_inode_timespec
*
575 btrfs_inode_otime(struct btrfs_inode_item
*inode_item
)
577 unsigned long ptr
= (unsigned long)inode_item
;
578 ptr
+= offsetof(struct btrfs_inode_item
, otime
);
579 return (struct btrfs_inode_timespec
*)ptr
;
582 BTRFS_SETGET_FUNCS(timespec_sec
, struct btrfs_inode_timespec
, sec
, 64);
583 BTRFS_SETGET_FUNCS(timespec_nsec
, struct btrfs_inode_timespec
, nsec
, 32);
585 /* struct btrfs_extent_item */
586 BTRFS_SETGET_FUNCS(extent_refs
, struct btrfs_extent_item
, refs
, 32);
588 /* struct btrfs_extent_ref */
589 BTRFS_SETGET_FUNCS(ref_root
, struct btrfs_extent_ref
, root
, 64);
590 BTRFS_SETGET_FUNCS(ref_generation
, struct btrfs_extent_ref
, generation
, 64);
591 BTRFS_SETGET_FUNCS(ref_objectid
, struct btrfs_extent_ref
, objectid
, 64);
592 BTRFS_SETGET_FUNCS(ref_offset
, struct btrfs_extent_ref
, offset
, 64);
594 BTRFS_SETGET_STACK_FUNCS(stack_ref_root
, struct btrfs_extent_ref
, root
, 64);
595 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation
, struct btrfs_extent_ref
,
597 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid
, struct btrfs_extent_ref
,
599 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset
, struct btrfs_extent_ref
, offset
, 64);
601 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs
, struct btrfs_extent_item
,
604 /* struct btrfs_node */
605 BTRFS_SETGET_FUNCS(key_blockptr
, struct btrfs_key_ptr
, blockptr
, 64);
606 BTRFS_SETGET_FUNCS(key_generation
, struct btrfs_key_ptr
, generation
, 64);
608 static inline u64
btrfs_node_blockptr(struct extent_buffer
*eb
, int nr
)
611 ptr
= offsetof(struct btrfs_node
, ptrs
) +
612 sizeof(struct btrfs_key_ptr
) * nr
;
613 return btrfs_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
);
616 static inline void btrfs_set_node_blockptr(struct extent_buffer
*eb
,
620 ptr
= offsetof(struct btrfs_node
, ptrs
) +
621 sizeof(struct btrfs_key_ptr
) * nr
;
622 btrfs_set_key_blockptr(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
625 static inline u64
btrfs_node_ptr_generation(struct extent_buffer
*eb
, int nr
)
628 ptr
= offsetof(struct btrfs_node
, ptrs
) +
629 sizeof(struct btrfs_key_ptr
) * nr
;
630 return btrfs_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
);
633 static inline void btrfs_set_node_ptr_generation(struct extent_buffer
*eb
,
637 ptr
= offsetof(struct btrfs_node
, ptrs
) +
638 sizeof(struct btrfs_key_ptr
) * nr
;
639 btrfs_set_key_generation(eb
, (struct btrfs_key_ptr
*)ptr
, val
);
642 static inline unsigned long btrfs_node_key_ptr_offset(int nr
)
644 return offsetof(struct btrfs_node
, ptrs
) +
645 sizeof(struct btrfs_key_ptr
) * nr
;
648 void btrfs_node_key(struct extent_buffer
*eb
,
649 struct btrfs_disk_key
*disk_key
, int nr
);
651 static inline void btrfs_set_node_key(struct extent_buffer
*eb
,
652 struct btrfs_disk_key
*disk_key
, int nr
)
655 ptr
= btrfs_node_key_ptr_offset(nr
);
656 write_eb_member(eb
, (struct btrfs_key_ptr
*)ptr
,
657 struct btrfs_key_ptr
, key
, disk_key
);
660 /* struct btrfs_item */
661 BTRFS_SETGET_FUNCS(item_offset
, struct btrfs_item
, offset
, 32);
662 BTRFS_SETGET_FUNCS(item_size
, struct btrfs_item
, size
, 32);
664 static inline unsigned long btrfs_item_nr_offset(int nr
)
666 return offsetof(struct btrfs_leaf
, items
) +
667 sizeof(struct btrfs_item
) * nr
;
670 static inline struct btrfs_item
*btrfs_item_nr(struct extent_buffer
*eb
,
673 return (struct btrfs_item
*)btrfs_item_nr_offset(nr
);
676 static inline u32
btrfs_item_end(struct extent_buffer
*eb
,
677 struct btrfs_item
*item
)
679 return btrfs_item_offset(eb
, item
) + btrfs_item_size(eb
, item
);
682 static inline u32
btrfs_item_end_nr(struct extent_buffer
*eb
, int nr
)
684 return btrfs_item_end(eb
, btrfs_item_nr(eb
, nr
));
687 static inline u32
btrfs_item_offset_nr(struct extent_buffer
*eb
, int nr
)
689 return btrfs_item_offset(eb
, btrfs_item_nr(eb
, nr
));
692 static inline u32
btrfs_item_size_nr(struct extent_buffer
*eb
, int nr
)
694 return btrfs_item_size(eb
, btrfs_item_nr(eb
, nr
));
697 static inline void btrfs_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 read_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
704 static inline void btrfs_set_item_key(struct extent_buffer
*eb
,
705 struct btrfs_disk_key
*disk_key
, int nr
)
707 struct btrfs_item
*item
= btrfs_item_nr(eb
, nr
);
708 write_eb_member(eb
, item
, struct btrfs_item
, key
, disk_key
);
711 /* struct btrfs_dir_item */
712 BTRFS_SETGET_FUNCS(dir_data_len
, struct btrfs_dir_item
, data_len
, 16);
713 BTRFS_SETGET_FUNCS(dir_type
, struct btrfs_dir_item
, type
, 8);
714 BTRFS_SETGET_FUNCS(dir_name_len
, struct btrfs_dir_item
, name_len
, 16);
716 static inline void btrfs_dir_item_key(struct extent_buffer
*eb
,
717 struct btrfs_dir_item
*item
,
718 struct btrfs_disk_key
*key
)
720 read_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
723 static inline void btrfs_set_dir_item_key(struct extent_buffer
*eb
,
724 struct btrfs_dir_item
*item
,
725 struct btrfs_disk_key
*key
)
727 write_eb_member(eb
, item
, struct btrfs_dir_item
, location
, key
);
730 /* struct btrfs_disk_key */
731 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid
, struct btrfs_disk_key
,
733 BTRFS_SETGET_STACK_FUNCS(disk_key_offset
, struct btrfs_disk_key
, offset
, 64);
734 BTRFS_SETGET_STACK_FUNCS(disk_key_type
, struct btrfs_disk_key
, type
, 8);
736 static inline void btrfs_disk_key_to_cpu(struct btrfs_key
*cpu
,
737 struct btrfs_disk_key
*disk
)
739 cpu
->offset
= le64_to_cpu(disk
->offset
);
740 cpu
->type
= disk
->type
;
741 cpu
->objectid
= le64_to_cpu(disk
->objectid
);
744 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key
*disk
,
745 struct btrfs_key
*cpu
)
747 disk
->offset
= cpu_to_le64(cpu
->offset
);
748 disk
->type
= cpu
->type
;
749 disk
->objectid
= cpu_to_le64(cpu
->objectid
);
752 static inline void btrfs_node_key_to_cpu(struct extent_buffer
*eb
,
753 struct btrfs_key
*key
, int nr
)
755 struct btrfs_disk_key disk_key
;
756 btrfs_node_key(eb
, &disk_key
, nr
);
757 btrfs_disk_key_to_cpu(key
, &disk_key
);
760 static inline void btrfs_item_key_to_cpu(struct extent_buffer
*eb
,
761 struct btrfs_key
*key
, int nr
)
763 struct btrfs_disk_key disk_key
;
764 btrfs_item_key(eb
, &disk_key
, nr
);
765 btrfs_disk_key_to_cpu(key
, &disk_key
);
768 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer
*eb
,
769 struct btrfs_dir_item
*item
,
770 struct btrfs_key
*key
)
772 struct btrfs_disk_key disk_key
;
773 btrfs_dir_item_key(eb
, item
, &disk_key
);
774 btrfs_disk_key_to_cpu(key
, &disk_key
);
778 static inline u8
btrfs_key_type(struct btrfs_key
*key
)
783 static inline void btrfs_set_key_type(struct btrfs_key
*key
, u8 val
)
788 /* struct btrfs_header */
789 BTRFS_SETGET_HEADER_FUNCS(header_bytenr
, struct btrfs_header
, bytenr
, 64);
790 BTRFS_SETGET_HEADER_FUNCS(header_generation
, struct btrfs_header
,
792 BTRFS_SETGET_HEADER_FUNCS(header_owner
, struct btrfs_header
, owner
, 64);
793 BTRFS_SETGET_HEADER_FUNCS(header_nritems
, struct btrfs_header
, nritems
, 32);
794 BTRFS_SETGET_HEADER_FUNCS(header_flags
, struct btrfs_header
, flags
, 16);
795 BTRFS_SETGET_HEADER_FUNCS(header_level
, struct btrfs_header
, level
, 8);
797 static inline u8
*btrfs_header_fsid(struct extent_buffer
*eb
)
799 unsigned long ptr
= offsetof(struct btrfs_header
, fsid
);
803 static inline u8
*btrfs_super_fsid(struct extent_buffer
*eb
)
805 unsigned long ptr
= offsetof(struct btrfs_super_block
, fsid
);
809 static inline u8
*btrfs_header_csum(struct extent_buffer
*eb
)
811 unsigned long ptr
= offsetof(struct btrfs_header
, csum
);
815 static inline struct btrfs_node
*btrfs_buffer_node(struct extent_buffer
*eb
)
820 static inline struct btrfs_leaf
*btrfs_buffer_leaf(struct extent_buffer
*eb
)
825 static inline struct btrfs_header
*btrfs_buffer_header(struct extent_buffer
*eb
)
830 static inline int btrfs_is_leaf(struct extent_buffer
*eb
)
832 return (btrfs_header_level(eb
) == 0);
835 /* struct btrfs_root_item */
836 BTRFS_SETGET_FUNCS(disk_root_refs
, struct btrfs_root_item
, refs
, 32);
837 BTRFS_SETGET_FUNCS(disk_root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
838 BTRFS_SETGET_FUNCS(disk_root_level
, struct btrfs_root_item
, level
, 8);
840 BTRFS_SETGET_STACK_FUNCS(root_bytenr
, struct btrfs_root_item
, bytenr
, 64);
841 BTRFS_SETGET_STACK_FUNCS(root_level
, struct btrfs_root_item
, level
, 8);
842 BTRFS_SETGET_STACK_FUNCS(root_dirid
, struct btrfs_root_item
, root_dirid
, 64);
843 BTRFS_SETGET_STACK_FUNCS(root_refs
, struct btrfs_root_item
, refs
, 32);
844 BTRFS_SETGET_STACK_FUNCS(root_flags
, struct btrfs_root_item
, flags
, 32);
845 BTRFS_SETGET_STACK_FUNCS(root_used
, struct btrfs_root_item
, bytes_used
, 64);
846 BTRFS_SETGET_STACK_FUNCS(root_limit
, struct btrfs_root_item
, byte_limit
, 64);
848 /* struct btrfs_super_block */
849 BTRFS_SETGET_STACK_FUNCS(super_bytenr
, struct btrfs_super_block
, bytenr
, 64);
850 BTRFS_SETGET_STACK_FUNCS(super_generation
, struct btrfs_super_block
,
852 BTRFS_SETGET_STACK_FUNCS(super_root
, struct btrfs_super_block
, root
, 64);
853 BTRFS_SETGET_STACK_FUNCS(super_root_level
, struct btrfs_super_block
,
855 BTRFS_SETGET_STACK_FUNCS(super_total_bytes
, struct btrfs_super_block
,
857 BTRFS_SETGET_STACK_FUNCS(super_bytes_used
, struct btrfs_super_block
,
859 BTRFS_SETGET_STACK_FUNCS(super_sectorsize
, struct btrfs_super_block
,
861 BTRFS_SETGET_STACK_FUNCS(super_nodesize
, struct btrfs_super_block
,
863 BTRFS_SETGET_STACK_FUNCS(super_leafsize
, struct btrfs_super_block
,
865 BTRFS_SETGET_STACK_FUNCS(super_stripesize
, struct btrfs_super_block
,
867 BTRFS_SETGET_STACK_FUNCS(super_root_dir
, struct btrfs_super_block
,
868 root_dir_objectid
, 64);
870 static inline unsigned long btrfs_leaf_data(struct extent_buffer
*l
)
872 return offsetof(struct btrfs_leaf
, items
);
875 /* struct btrfs_file_extent_item */
876 BTRFS_SETGET_FUNCS(file_extent_type
, struct btrfs_file_extent_item
, type
, 8);
878 static inline unsigned long btrfs_file_extent_inline_start(struct
879 btrfs_file_extent_item
*e
)
881 unsigned long offset
= (unsigned long)e
;
882 offset
+= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
886 static inline u32
btrfs_file_extent_calc_inline_size(u32 datasize
)
888 return offsetof(struct btrfs_file_extent_item
, disk_bytenr
) + datasize
;
891 static inline u32
btrfs_file_extent_inline_len(struct extent_buffer
*eb
,
892 struct btrfs_item
*e
)
894 unsigned long offset
;
895 offset
= offsetof(struct btrfs_file_extent_item
, disk_bytenr
);
896 return btrfs_item_size(eb
, e
) - offset
;
899 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr
, struct btrfs_file_extent_item
,
901 BTRFS_SETGET_FUNCS(file_extent_generation
, struct btrfs_file_extent_item
,
903 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes
, struct btrfs_file_extent_item
,
905 BTRFS_SETGET_FUNCS(file_extent_offset
, struct btrfs_file_extent_item
,
907 BTRFS_SETGET_FUNCS(file_extent_num_bytes
, struct btrfs_file_extent_item
,
910 static inline struct btrfs_root
*btrfs_sb(struct super_block
*sb
)
912 return sb
->s_fs_info
;
915 static inline int btrfs_set_root_name(struct btrfs_root
*root
,
916 const char *name
, int len
)
918 /* if we already have a name just free it */
922 root
->name
= kmalloc(len
+1, GFP_KERNEL
);
926 memcpy(root
->name
, name
, len
);
927 root
->name
[len
] ='\0';
932 static inline u32
btrfs_level_size(struct btrfs_root
*root
, int level
) {
934 return root
->leafsize
;
935 return root
->nodesize
;
938 /* helper function to cast into the data area of the leaf. */
939 #define btrfs_item_ptr(leaf, slot, type) \
940 ((type *)(btrfs_leaf_data(leaf) + \
941 btrfs_item_offset_nr(leaf, slot)))
943 #define btrfs_item_ptr_offset(leaf, slot) \
944 ((unsigned long)(btrfs_leaf_data(leaf) + \
945 btrfs_item_offset_nr(leaf, slot)))
947 static inline struct dentry
*fdentry(struct file
*file
) {
948 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
949 return file
->f_dentry
;
951 return file
->f_path
.dentry
;
956 u32
btrfs_count_snapshots_in_path(struct btrfs_root
*root
,
957 struct btrfs_path
*count_path
,
959 int btrfs_extent_post_op(struct btrfs_trans_handle
*trans
,
960 struct btrfs_root
*root
);
961 int btrfs_copy_pinned(struct btrfs_root
*root
, struct extent_io_tree
*copy
);
962 struct btrfs_block_group_cache
*btrfs_lookup_block_group(struct
965 struct btrfs_block_group_cache
*btrfs_find_block_group(struct btrfs_root
*root
,
966 struct btrfs_block_group_cache
967 *hint
, u64 search_start
,
968 int data
, int owner
);
969 int btrfs_inc_root_ref(struct btrfs_trans_handle
*trans
,
970 struct btrfs_root
*root
, u64 owner_objectid
);
971 struct extent_buffer
*btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
972 struct btrfs_root
*root
, u32 size
,
974 u64 hint
, u64 empty_size
);
975 struct extent_buffer
*__btrfs_alloc_free_block(struct btrfs_trans_handle
*trans
,
976 struct btrfs_root
*root
,
984 int btrfs_grow_extent_tree(struct btrfs_trans_handle
*trans
,
985 struct btrfs_root
*root
, u64 new_size
);
986 int btrfs_shrink_extent_tree(struct btrfs_root
*root
, u64 new_size
);
987 int btrfs_insert_extent_backref(struct btrfs_trans_handle
*trans
,
988 struct btrfs_root
*root
,
989 struct btrfs_path
*path
, u64 bytenr
,
990 u64 root_objectid
, u64 ref_generation
,
991 u64 owner
, u64 owner_offset
);
992 int btrfs_alloc_extent(struct btrfs_trans_handle
*trans
,
993 struct btrfs_root
*root
,
994 u64 num_bytes
, u64 root_objectid
, u64 ref_generation
,
995 u64 owner
, u64 owner_offset
,
996 u64 empty_size
, u64 hint_byte
,
997 u64 search_end
, struct btrfs_key
*ins
, int data
);
998 int btrfs_inc_ref(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
999 struct extent_buffer
*buf
);
1000 int btrfs_free_extent(struct btrfs_trans_handle
*trans
, struct btrfs_root
1001 *root
, u64 bytenr
, u64 num_bytes
,
1002 u64 root_objectid
, u64 ref_generation
,
1003 u64 owner_objectid
, u64 owner_offset
, int pin
);
1004 int btrfs_finish_extent_commit(struct btrfs_trans_handle
*trans
,
1005 struct btrfs_root
*root
,
1006 struct extent_io_tree
*unpin
);
1007 int btrfs_inc_extent_ref(struct btrfs_trans_handle
*trans
,
1008 struct btrfs_root
*root
,
1009 u64 bytenr
, u64 num_bytes
,
1010 u64 root_objectid
, u64 ref_generation
,
1011 u64 owner
, u64 owner_offset
);
1012 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle
*trans
,
1013 struct btrfs_root
*root
);
1014 int btrfs_free_block_groups(struct btrfs_fs_info
*info
);
1015 int btrfs_read_block_groups(struct btrfs_root
*root
);
1017 int btrfs_cow_block(struct btrfs_trans_handle
*trans
,
1018 struct btrfs_root
*root
, struct extent_buffer
*buf
,
1019 struct extent_buffer
*parent
, int parent_slot
,
1020 struct extent_buffer
**cow_ret
);
1021 int btrfs_copy_root(struct btrfs_trans_handle
*trans
,
1022 struct btrfs_root
*root
,
1023 struct extent_buffer
*buf
,
1024 struct extent_buffer
**cow_ret
, u64 new_root_objectid
);
1025 int btrfs_extend_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1026 *root
, struct btrfs_path
*path
, u32 data_size
);
1027 int btrfs_truncate_item(struct btrfs_trans_handle
*trans
,
1028 struct btrfs_root
*root
,
1029 struct btrfs_path
*path
,
1030 u32 new_size
, int from_end
);
1031 int btrfs_search_slot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1032 *root
, struct btrfs_key
*key
, struct btrfs_path
*p
, int
1034 int btrfs_realloc_node(struct btrfs_trans_handle
*trans
,
1035 struct btrfs_root
*root
, struct extent_buffer
*parent
,
1036 int start_slot
, int cache_only
, u64
*last_ret
,
1037 struct btrfs_key
*progress
);
1038 void btrfs_release_path(struct btrfs_root
*root
, struct btrfs_path
*p
);
1039 struct btrfs_path
*btrfs_alloc_path(void);
1040 void btrfs_free_path(struct btrfs_path
*p
);
1041 void btrfs_init_path(struct btrfs_path
*p
);
1042 int btrfs_del_items(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1043 struct btrfs_path
*path
, int slot
, int nr
);
1045 static inline int btrfs_del_item(struct btrfs_trans_handle
*trans
,
1046 struct btrfs_root
*root
,
1047 struct btrfs_path
*path
)
1049 return btrfs_del_items(trans
, root
, path
, path
->slots
[0], 1);
1052 int btrfs_insert_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1053 *root
, struct btrfs_key
*key
, void *data
, u32 data_size
);
1054 int btrfs_insert_empty_items(struct btrfs_trans_handle
*trans
,
1055 struct btrfs_root
*root
,
1056 struct btrfs_path
*path
,
1057 struct btrfs_key
*cpu_key
, u32
*data_size
, int nr
);
1059 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle
*trans
,
1060 struct btrfs_root
*root
,
1061 struct btrfs_path
*path
,
1062 struct btrfs_key
*key
,
1065 return btrfs_insert_empty_items(trans
, root
, path
, key
, &data_size
, 1);
1068 int btrfs_next_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1069 int btrfs_prev_leaf(struct btrfs_root
*root
, struct btrfs_path
*path
);
1070 int btrfs_leaf_free_space(struct btrfs_root
*root
, struct extent_buffer
*leaf
);
1071 int btrfs_drop_snapshot(struct btrfs_trans_handle
*trans
, struct btrfs_root
1074 int btrfs_del_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
*root
,
1075 struct btrfs_key
*key
);
1076 int btrfs_insert_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1077 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1079 int btrfs_update_root(struct btrfs_trans_handle
*trans
, struct btrfs_root
1080 *root
, struct btrfs_key
*key
, struct btrfs_root_item
1082 int btrfs_find_last_root(struct btrfs_root
*root
, u64 objectid
, struct
1083 btrfs_root_item
*item
, struct btrfs_key
*key
);
1084 int btrfs_find_dead_roots(struct btrfs_root
*root
, u64 objectid
,
1085 struct btrfs_root
*latest_root
);
1087 int btrfs_insert_dir_item(struct btrfs_trans_handle
*trans
, struct btrfs_root
1088 *root
, const char *name
, int name_len
, u64 dir
,
1089 struct btrfs_key
*location
, u8 type
);
1090 struct btrfs_dir_item
*btrfs_lookup_dir_item(struct btrfs_trans_handle
*trans
,
1091 struct btrfs_root
*root
,
1092 struct btrfs_path
*path
, u64 dir
,
1093 const char *name
, int name_len
,
1095 struct btrfs_dir_item
*
1096 btrfs_lookup_dir_index_item(struct btrfs_trans_handle
*trans
,
1097 struct btrfs_root
*root
,
1098 struct btrfs_path
*path
, u64 dir
,
1099 u64 objectid
, const char *name
, int name_len
,
1101 struct btrfs_dir_item
*btrfs_match_dir_item_name(struct btrfs_root
*root
,
1102 struct btrfs_path
*path
,
1103 const char *name
, int name_len
);
1104 int btrfs_delete_one_dir_name(struct btrfs_trans_handle
*trans
,
1105 struct btrfs_root
*root
,
1106 struct btrfs_path
*path
,
1107 struct btrfs_dir_item
*di
);
1108 int btrfs_insert_xattr_item(struct btrfs_trans_handle
*trans
,
1109 struct btrfs_root
*root
, const char *name
,
1110 u16 name_len
, const void *data
, u16 data_len
,
1112 struct btrfs_dir_item
*btrfs_lookup_xattr(struct btrfs_trans_handle
*trans
,
1113 struct btrfs_root
*root
,
1114 struct btrfs_path
*path
, u64 dir
,
1115 const char *name
, u16 name_len
,
1118 int btrfs_find_free_objectid(struct btrfs_trans_handle
*trans
,
1119 struct btrfs_root
*fs_root
,
1120 u64 dirid
, u64
*objectid
);
1121 int btrfs_find_highest_inode(struct btrfs_root
*fs_root
, u64
*objectid
);
1124 int btrfs_insert_inode_ref(struct btrfs_trans_handle
*trans
,
1125 struct btrfs_root
*root
,
1126 const char *name
, int name_len
,
1127 u64 inode_objectid
, u64 ref_objectid
);
1128 int btrfs_del_inode_ref(struct btrfs_trans_handle
*trans
,
1129 struct btrfs_root
*root
,
1130 const char *name
, int name_len
,
1131 u64 inode_objectid
, u64 ref_objectid
);
1132 int btrfs_insert_empty_inode(struct btrfs_trans_handle
*trans
,
1133 struct btrfs_root
*root
,
1134 struct btrfs_path
*path
, u64 objectid
);
1135 int btrfs_lookup_inode(struct btrfs_trans_handle
*trans
, struct btrfs_root
1136 *root
, struct btrfs_path
*path
,
1137 struct btrfs_key
*location
, int mod
);
1140 int btrfs_insert_file_extent(struct btrfs_trans_handle
*trans
,
1141 struct btrfs_root
*root
,
1142 u64 objectid
, u64 pos
, u64 offset
,
1145 int btrfs_lookup_file_extent(struct btrfs_trans_handle
*trans
,
1146 struct btrfs_root
*root
,
1147 struct btrfs_path
*path
, u64 objectid
,
1148 u64 bytenr
, int mod
);
1149 int btrfs_csum_file_block(struct btrfs_trans_handle
*trans
,
1150 struct btrfs_root
*root
,
1151 struct inode
*inode
,
1152 u64 objectid
, u64 offset
,
1153 char *data
, size_t len
);
1154 struct btrfs_csum_item
*btrfs_lookup_csum(struct btrfs_trans_handle
*trans
,
1155 struct btrfs_root
*root
,
1156 struct btrfs_path
*path
,
1157 u64 objectid
, u64 offset
,
1159 int btrfs_csum_truncate(struct btrfs_trans_handle
*trans
,
1160 struct btrfs_root
*root
, struct btrfs_path
*path
,
1163 unsigned long btrfs_force_ra(struct address_space
*mapping
,
1164 struct file_ra_state
*ra
, struct file
*file
,
1165 pgoff_t offset
, pgoff_t last_index
);
1166 int btrfs_check_free_space(struct btrfs_root
*root
, u64 num_required
,
1168 int btrfs_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1169 int btrfs_readpage(struct file
*file
, struct page
*page
);
1170 void btrfs_delete_inode(struct inode
*inode
);
1171 void btrfs_put_inode(struct inode
*inode
);
1172 void btrfs_read_locked_inode(struct inode
*inode
);
1173 int btrfs_write_inode(struct inode
*inode
, int wait
);
1174 void btrfs_dirty_inode(struct inode
*inode
);
1175 struct inode
*btrfs_alloc_inode(struct super_block
*sb
);
1176 void btrfs_destroy_inode(struct inode
*inode
);
1177 int btrfs_init_cachep(void);
1178 void btrfs_destroy_cachep(void);
1179 long btrfs_ioctl(struct file
*file
, unsigned int cmd
, unsigned long arg
);
1180 struct inode
*btrfs_iget_locked(struct super_block
*s
, u64 objectid
,
1181 struct btrfs_root
*root
);
1182 struct inode
*btrfs_ilookup(struct super_block
*s
, u64 objectid
,
1184 int btrfs_commit_write(struct file
*file
, struct page
*page
,
1185 unsigned from
, unsigned to
);
1186 struct extent_map
*btrfs_get_extent(struct inode
*inode
, struct page
*page
,
1187 size_t page_offset
, u64 start
, u64 end
,
1189 int btrfs_update_inode(struct btrfs_trans_handle
*trans
,
1190 struct btrfs_root
*root
,
1191 struct inode
*inode
);
1193 int btrfs_drop_extent_cache(struct inode
*inode
, u64 start
, u64 end
);
1194 int btrfs_check_file(struct btrfs_root
*root
, struct inode
*inode
);
1195 extern struct file_operations btrfs_file_operations
;
1196 int btrfs_drop_extents(struct btrfs_trans_handle
*trans
,
1197 struct btrfs_root
*root
, struct inode
*inode
,
1198 u64 start
, u64 end
, u64 inline_limit
, u64
*hint_block
);
1200 int btrfs_defrag_leaves(struct btrfs_trans_handle
*trans
,
1201 struct btrfs_root
*root
, int cache_only
);
1204 int btrfs_init_sysfs(void);
1205 void btrfs_exit_sysfs(void);
1206 int btrfs_sysfs_add_super(struct btrfs_fs_info
*fs
);
1207 int btrfs_sysfs_add_root(struct btrfs_root
*root
);
1208 void btrfs_sysfs_del_root(struct btrfs_root
*root
);
1209 void btrfs_sysfs_del_super(struct btrfs_fs_info
*root
);
1212 ssize_t
btrfs_listxattr(struct dentry
*dentry
, char *buffer
, size_t size
);
1213 int btrfs_delete_xattrs(struct btrfs_trans_handle
*trans
,
1214 struct btrfs_root
*root
, struct inode
*inode
);
1216 u64
btrfs_parse_size(char *str
);