2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
23 #include <linux/highmem.h>
25 #include <linux/workqueue.h>
26 #include <linux/completion.h>
27 #include <asm/kmap_types.h>
28 #include "bit-radix.h"
29 #include "extent_map.h"
31 struct btrfs_trans_handle;
32 struct btrfs_transaction;
33 extern struct kmem_cache *btrfs_trans_handle_cachep;
34 extern struct kmem_cache *btrfs_transaction_cachep;
35 extern struct kmem_cache *btrfs_bit_radix_cachep;
36 extern struct kmem_cache *btrfs_path_cachep;
38 #define BTRFS_MAGIC "_B2RfS_M"
40 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
41 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
42 #define BTRFS_FS_TREE_OBJECTID 3ULL
43 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
44 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
47 * we can actually store much bigger names, but lets not confuse the rest
50 #define BTRFS_NAME_LEN 255
52 /* 32 bytes in various csum fields */
53 #define BTRFS_CSUM_SIZE 32
54 /* four bytes for CRC32 */
55 #define BTRFS_CRC32_SIZE 4
56 #define BTRFS_EMPTY_DIR_SIZE 6
58 #define BTRFS_FT_UNKNOWN 0
59 #define BTRFS_FT_REG_FILE 1
60 #define BTRFS_FT_DIR 2
61 #define BTRFS_FT_CHRDEV 3
62 #define BTRFS_FT_BLKDEV 4
63 #define BTRFS_FT_FIFO 5
64 #define BTRFS_FT_SOCK 6
65 #define BTRFS_FT_SYMLINK 7
66 #define BTRFS_FT_MAX 8
69 * the key defines the order in the tree, and so it also defines (optimal)
70 * block layout. objectid corresonds to the inode number. The flags
71 * tells us things about the object, and is a kind of stream selector.
72 * so for a given inode, keys with flags of 1 might refer to the inode
73 * data, flags of 2 may point to file data in the btree and flags == 3
74 * may point to extents.
76 * offset is the starting byte offset for this key in the stream.
78 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
79 * in cpu native order. Otherwise they are identical and their sizes
80 * should be the same (ie both packed)
82 struct btrfs_disk_key {
86 } __attribute__ ((__packed__));
92 } __attribute__ ((__packed__));
94 #define BTRFS_FSID_SIZE 16
96 * every tree block (leaf or node) starts with this header.
99 u8 csum[BTRFS_CSUM_SIZE];
100 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
101 __le64 bytenr; /* which block this node is supposed to live in */
107 } __attribute__ ((__packed__));
109 #define BTRFS_MAX_LEVEL 8
110 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
111 sizeof(struct btrfs_header)) / \
112 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
113 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
114 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
115 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
116 sizeof(struct btrfs_item) - \
117 sizeof(struct btrfs_file_extent_item))
120 * the super block basically lists the main trees of the FS
121 * it currently lacks any block count etc etc
123 struct btrfs_super_block {
124 u8 csum[BTRFS_CSUM_SIZE];
125 /* the first 3 fields must match struct btrfs_header */
126 u8 fsid[16]; /* FS specific uuid */
127 __le64 bytenr; /* this block number */
133 __le64 root_dir_objectid;
138 } __attribute__ ((__packed__));
141 * A leaf is full of items. offset and size tell us where to find
142 * the item in the leaf (relative to the start of the data area)
145 struct btrfs_disk_key key;
148 } __attribute__ ((__packed__));
151 * leaves have an item area and a data area:
152 * [item0, item1....itemN] [free space] [dataN...data1, data0]
154 * The data is separate from the items to get the keys closer together
158 struct btrfs_header header;
159 struct btrfs_item items[];
160 } __attribute__ ((__packed__));
163 * all non-leaf blocks are nodes, they hold only keys and pointers to
166 struct btrfs_key_ptr {
167 struct btrfs_disk_key key;
169 } __attribute__ ((__packed__));
172 struct btrfs_header header;
173 struct btrfs_key_ptr ptrs[];
174 } __attribute__ ((__packed__));
177 * btrfs_paths remember the path taken from the root down to the leaf.
178 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
179 * to any other levels that are present.
181 * The slots array records the index of the item or block pointer
182 * used while walking the tree.
185 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
186 int slots[BTRFS_MAX_LEVEL];
192 * items in the extent btree are used to record the objectid of the
193 * owner of the block and the number of references
195 struct btrfs_extent_item {
198 } __attribute__ ((__packed__));
200 struct btrfs_inode_timespec {
203 } __attribute__ ((__packed__));
206 * there is no padding here on purpose. If you want to extent the inode,
207 * make a new item type
209 struct btrfs_inode_item {
221 struct btrfs_inode_timespec atime;
222 struct btrfs_inode_timespec ctime;
223 struct btrfs_inode_timespec mtime;
224 struct btrfs_inode_timespec otime;
225 } __attribute__ ((__packed__));
227 struct btrfs_dir_item {
228 struct btrfs_disk_key location;
232 } __attribute__ ((__packed__));
234 struct btrfs_root_item {
235 struct btrfs_inode_item inode;
242 struct btrfs_disk_key drop_progress;
245 } __attribute__ ((__packed__));
247 #define BTRFS_FILE_EXTENT_REG 0
248 #define BTRFS_FILE_EXTENT_INLINE 1
250 struct btrfs_file_extent_item {
254 * disk space consumed by the extent, checksum blocks are included
258 __le64 disk_num_bytes;
260 * the logical offset in file blocks (no csums)
261 * this extent record is for. This allows a file extent to point
262 * into the middle of an existing extent on disk, sharing it
263 * between two snapshots (useful if some bytes in the middle of the
264 * extent have changed
268 * the logical number of file blocks (no csums included)
271 } __attribute__ ((__packed__));
273 struct btrfs_csum_item {
275 } __attribute__ ((__packed__));
277 /* tag for the radix tree of block groups in ram */
278 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
281 #define BTRFS_BLOCK_GROUP_DATA 1
282 struct btrfs_block_group_item {
285 } __attribute__ ((__packed__));
287 struct btrfs_block_group_cache {
288 struct btrfs_key key;
289 struct btrfs_block_group_item item;
294 struct btrfs_fs_info {
295 u8 fsid[BTRFS_FSID_SIZE];
296 struct btrfs_root *extent_root;
297 struct btrfs_root *tree_root;
298 struct radix_tree_root fs_roots_radix;
300 struct extent_map_tree free_space_cache;
301 struct extent_map_tree block_group_cache;
302 struct extent_map_tree pinned_extents;
303 struct extent_map_tree pending_del;
304 struct extent_map_tree extent_ins;
307 u64 last_trans_committed;
308 struct btrfs_transaction *running_transaction;
309 struct btrfs_super_block super_copy;
310 struct extent_buffer *sb_buffer;
311 struct super_block *sb;
312 struct inode *btree_inode;
313 spinlock_t hash_lock;
314 struct mutex trans_mutex;
315 struct mutex fs_mutex;
316 struct list_head trans_list;
317 struct list_head hashers;
318 struct list_head dead_roots;
319 struct delayed_work trans_work;
320 struct kobject super_kobj;
321 struct completion kobj_unregister;
327 * in ram representation of the tree. extent_root is used for all allocations
328 * and for the extent tree extent_root root.
331 struct extent_buffer *node;
332 struct extent_buffer *commit_root;
333 struct btrfs_root_item root_item;
334 struct btrfs_key root_key;
335 struct btrfs_fs_info *fs_info;
337 struct kobject root_kobj;
338 struct completion kobj_unregister;
339 struct rw_semaphore snap_sem;
343 /* data allocations are done in sectorsize units */
346 /* node allocations are done in nodesize units */
349 /* leaf allocations are done in leafsize units */
354 u64 last_inode_alloc;
356 struct btrfs_key defrag_progress;
363 * inode items have the data typically returned from stat and store other
364 * info about object characteristics. There is one for every file and dir in
367 #define BTRFS_INODE_ITEM_KEY 1
369 /* reserve 2-15 close to the inode for later flexibility */
372 * dir items are the name -> inode pointers in a directory. There is one
373 * for every name in a directory.
375 #define BTRFS_DIR_ITEM_KEY 16
376 #define BTRFS_DIR_INDEX_KEY 17
378 * extent data is for file data
380 #define BTRFS_EXTENT_DATA_KEY 18
382 * csum items have the checksums for data in the extents
384 #define BTRFS_CSUM_ITEM_KEY 19
386 /* reserve 20-31 for other file stuff */
389 * root items point to tree roots. There are typically in the root
390 * tree used by the super block to find all the other trees
392 #define BTRFS_ROOT_ITEM_KEY 32
394 * extent items are in the extent map tree. These record which blocks
395 * are used, and how many references there are to each block
397 #define BTRFS_EXTENT_ITEM_KEY 33
400 * block groups give us hints into the extent allocation trees. Which
401 * blocks are free etc etc
403 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
406 * string items are for debugging. They just store a short string of
409 #define BTRFS_STRING_ITEM_KEY 253
411 /* some macros to generate set/get funcs for the struct fields. This
412 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
415 #define le8_to_cpu(v) (v)
416 #define cpu_to_le8(v) (v)
419 #define read_eb_member(eb, ptr, type, member, result) ( \
420 read_extent_buffer(eb, (char *)(result), \
421 ((unsigned long)(ptr)) + \
422 offsetof(type, member), \
423 sizeof(((type *)0)->member)))
425 #define write_eb_member(eb, ptr, type, member, result) ( \
426 write_extent_buffer(eb, (char *)(result), \
427 ((unsigned long)(ptr)) + \
428 offsetof(type, member), \
429 sizeof(((type *)0)->member)))
431 #ifndef BTRFS_SETGET_FUNCS
432 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
433 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
434 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
437 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
438 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
440 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
441 unsigned long offset = offsetof(type, member); \
443 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
444 res = le##bits##_to_cpu(*tmp); \
445 kunmap_atomic(kaddr, KM_USER0); \
448 static inline void btrfs_set_##name(struct extent_buffer *eb, \
451 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
452 unsigned long offset = offsetof(type, member); \
453 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
454 *tmp = cpu_to_le##bits(val); \
455 kunmap_atomic(kaddr, KM_USER0); \
458 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
459 static inline u##bits btrfs_##name(type *s) \
461 return le##bits##_to_cpu(s->member); \
463 static inline void btrfs_set_##name(type *s, u##bits val) \
465 s->member = cpu_to_le##bits(val); \
468 /* struct btrfs_block_group_item */
469 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
471 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
474 /* struct btrfs_inode_item */
475 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
476 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
477 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
478 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
479 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
480 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
481 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
482 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
483 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
484 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
485 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
488 static inline struct btrfs_inode_timespec *
489 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
491 unsigned long ptr = (unsigned long)inode_item;
492 ptr += offsetof(struct btrfs_inode_item, atime);
493 return (struct btrfs_inode_timespec *)ptr;
496 static inline struct btrfs_inode_timespec *
497 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
499 unsigned long ptr = (unsigned long)inode_item;
500 ptr += offsetof(struct btrfs_inode_item, mtime);
501 return (struct btrfs_inode_timespec *)ptr;
504 static inline struct btrfs_inode_timespec *
505 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
507 unsigned long ptr = (unsigned long)inode_item;
508 ptr += offsetof(struct btrfs_inode_item, ctime);
509 return (struct btrfs_inode_timespec *)ptr;
512 static inline struct btrfs_inode_timespec *
513 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
515 unsigned long ptr = (unsigned long)inode_item;
516 ptr += offsetof(struct btrfs_inode_item, otime);
517 return (struct btrfs_inode_timespec *)ptr;
520 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
521 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
523 /* struct btrfs_extent_item */
524 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
525 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 64);
527 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
529 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
532 /* struct btrfs_node */
533 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
535 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
538 ptr = offsetof(struct btrfs_node, ptrs) +
539 sizeof(struct btrfs_key_ptr) * nr;
540 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
543 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
547 ptr = offsetof(struct btrfs_node, ptrs) +
548 sizeof(struct btrfs_key_ptr) * nr;
549 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
552 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
554 return offsetof(struct btrfs_node, ptrs) +
555 sizeof(struct btrfs_key_ptr) * nr;
558 static inline void btrfs_node_key(struct extent_buffer *eb,
559 struct btrfs_disk_key *disk_key, int nr)
562 ptr = btrfs_node_key_ptr_offset(nr);
563 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
564 struct btrfs_key_ptr, key, disk_key);
566 static inline void btrfs_set_node_key(struct extent_buffer *eb,
567 struct btrfs_disk_key *disk_key, int nr)
570 ptr = btrfs_node_key_ptr_offset(nr);
571 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
572 struct btrfs_key_ptr, key, disk_key);
575 /* struct btrfs_item */
576 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
577 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
579 static inline unsigned long btrfs_item_nr_offset(int nr)
581 return offsetof(struct btrfs_leaf, items) +
582 sizeof(struct btrfs_item) * nr;
585 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
588 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
591 static inline u32 btrfs_item_end(struct extent_buffer *eb,
592 struct btrfs_item *item)
594 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
597 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
599 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
602 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
604 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
607 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
609 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
612 static inline void btrfs_item_key(struct extent_buffer *eb,
613 struct btrfs_disk_key *disk_key, int nr)
615 struct btrfs_item *item = btrfs_item_nr(eb, nr);
616 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
619 static inline void btrfs_set_item_key(struct extent_buffer *eb,
620 struct btrfs_disk_key *disk_key, int nr)
622 struct btrfs_item *item = btrfs_item_nr(eb, nr);
623 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
626 /* struct btrfs_dir_item */
627 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
628 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
629 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
631 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
632 struct btrfs_dir_item *item,
633 struct btrfs_disk_key *key)
635 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
638 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
639 struct btrfs_dir_item *item,
640 struct btrfs_disk_key *key)
642 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
645 /* struct btrfs_disk_key */
646 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
648 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
649 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
651 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
652 struct btrfs_disk_key *disk)
654 cpu->offset = le64_to_cpu(disk->offset);
655 cpu->type = disk->type;
656 cpu->objectid = le64_to_cpu(disk->objectid);
659 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
660 struct btrfs_key *cpu)
662 disk->offset = cpu_to_le64(cpu->offset);
663 disk->type = cpu->type;
664 disk->objectid = cpu_to_le64(cpu->objectid);
667 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
668 struct btrfs_key *key, int nr)
670 struct btrfs_disk_key disk_key;
671 btrfs_node_key(eb, &disk_key, nr);
672 btrfs_disk_key_to_cpu(key, &disk_key);
675 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
676 struct btrfs_key *key, int nr)
678 struct btrfs_disk_key disk_key;
679 btrfs_item_key(eb, &disk_key, nr);
680 btrfs_disk_key_to_cpu(key, &disk_key);
683 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
684 struct btrfs_dir_item *item,
685 struct btrfs_key *key)
687 struct btrfs_disk_key disk_key;
688 btrfs_dir_item_key(eb, item, &disk_key);
689 btrfs_disk_key_to_cpu(key, &disk_key);
693 static inline u8 btrfs_key_type(struct btrfs_key *key)
698 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
703 /* struct btrfs_header */
704 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
705 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
707 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
708 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
709 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
710 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
712 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
714 unsigned long ptr = offsetof(struct btrfs_header, fsid);
718 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
720 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
724 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
726 unsigned long ptr = offsetof(struct btrfs_header, csum);
730 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
735 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
740 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
745 static inline int btrfs_is_leaf(struct extent_buffer *eb)
747 return (btrfs_header_level(eb) == 0);
750 /* struct btrfs_root_item */
751 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
752 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
753 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
755 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
756 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
757 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
758 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
759 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
760 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
761 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
763 /* struct btrfs_super_block */
764 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
765 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
767 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
768 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
770 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
772 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
774 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
776 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
778 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
780 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
781 root_dir_objectid, 64);
783 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
785 return offsetof(struct btrfs_leaf, items);
788 /* struct btrfs_file_extent_item */
789 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
791 static inline unsigned long btrfs_file_extent_inline_start(struct
792 btrfs_file_extent_item *e)
794 unsigned long offset = (unsigned long)e;
795 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
799 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
801 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
804 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
805 struct btrfs_item *e)
807 unsigned long offset;
808 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
809 return btrfs_item_size(eb, e) - offset;
812 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
814 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
816 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
818 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
820 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
823 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
825 return sb->s_fs_info;
828 static inline int btrfs_set_root_name(struct btrfs_root *root,
829 const char *name, int len)
831 /* if we already have a name just free it */
835 root->name = kmalloc(len+1, GFP_KERNEL);
839 memcpy(root->name, name, len);
840 root->name[len] ='\0';
845 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
847 return root->leafsize;
848 return root->nodesize;
851 /* helper function to cast into the data area of the leaf. */
852 #define btrfs_item_ptr(leaf, slot, type) \
853 ((type *)(btrfs_leaf_data(leaf) + \
854 btrfs_item_offset_nr(leaf, slot)))
856 #define btrfs_item_ptr_offset(leaf, slot) \
857 ((unsigned long)(btrfs_leaf_data(leaf) + \
858 btrfs_item_offset_nr(leaf, slot)))
860 /* mount option defines and helpers */
861 #define BTRFS_MOUNT_SUBVOL 0x000001
862 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
863 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
864 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
867 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
868 struct btrfs_root *root);
869 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
870 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
873 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
874 struct btrfs_block_group_cache
875 *hint, u64 search_start,
876 int data, int owner);
877 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
878 struct btrfs_root *root);
879 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
880 struct btrfs_root *root, u32 size,
881 u64 hint, u64 empty_size);
882 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
883 struct btrfs_root *root, u64 owner,
884 u64 num_bytes, u64 empty_size, u64 search_start,
885 u64 search_end, struct btrfs_key *ins, int data);
886 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
887 struct extent_buffer *buf);
888 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
889 *root, u64 bytenr, u64 num_bytes, int pin);
890 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
891 struct btrfs_root *root,
892 struct extent_map_tree *unpin);
893 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
894 struct btrfs_root *root,
895 u64 bytenr, u64 num_bytes);
896 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
897 struct btrfs_root *root);
898 int btrfs_free_block_groups(struct btrfs_fs_info *info);
899 int btrfs_read_block_groups(struct btrfs_root *root);
901 int btrfs_cow_block(struct btrfs_trans_handle *trans,
902 struct btrfs_root *root, struct extent_buffer *buf,
903 struct extent_buffer *parent, int parent_slot,
904 struct extent_buffer **cow_ret);
905 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
906 *root, struct btrfs_path *path, u32 data_size);
907 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
908 struct btrfs_root *root,
909 struct btrfs_path *path,
910 u32 new_size, int from_end);
911 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
912 *root, struct btrfs_key *key, struct btrfs_path *p, int
914 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
915 struct btrfs_root *root, struct extent_buffer *parent,
916 int start_slot, int cache_only, u64 *last_ret,
917 struct btrfs_key *progress);
918 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
919 struct btrfs_path *btrfs_alloc_path(void);
920 void btrfs_free_path(struct btrfs_path *p);
921 void btrfs_init_path(struct btrfs_path *p);
922 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
923 struct btrfs_path *path);
924 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
925 *root, struct btrfs_key *key, void *data, u32 data_size);
926 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
927 *root, struct btrfs_path *path, struct btrfs_key
928 *cpu_key, u32 data_size);
929 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
930 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
931 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
934 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
935 struct btrfs_key *key);
936 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
937 *root, struct btrfs_key *key, struct btrfs_root_item
939 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
940 *root, struct btrfs_key *key, struct btrfs_root_item
942 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
943 btrfs_root_item *item, struct btrfs_key *key);
944 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
945 struct btrfs_root *latest_root);
947 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
948 *root, const char *name, int name_len, u64 dir,
949 struct btrfs_key *location, u8 type);
950 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
951 struct btrfs_root *root,
952 struct btrfs_path *path, u64 dir,
953 const char *name, int name_len,
955 struct btrfs_dir_item *
956 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
957 struct btrfs_root *root,
958 struct btrfs_path *path, u64 dir,
959 u64 objectid, const char *name, int name_len,
961 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
962 struct btrfs_path *path,
963 const char *name, int name_len);
964 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
965 struct btrfs_root *root,
966 struct btrfs_path *path,
967 struct btrfs_dir_item *di);
969 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
970 struct btrfs_root *fs_root,
971 u64 dirid, u64 *objectid);
972 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
975 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
976 struct btrfs_root *root,
977 struct btrfs_path *path, u64 objectid);
978 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
979 *root, struct btrfs_path *path,
980 struct btrfs_key *location, int mod);
983 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
984 struct btrfs_root *root,
985 u64 objectid, u64 pos, u64 offset,
988 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
989 struct btrfs_root *root,
990 struct btrfs_path *path, u64 objectid,
991 u64 bytenr, int mod);
992 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
993 struct btrfs_root *root,
995 u64 objectid, u64 offset,
996 char *data, size_t len);
997 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
998 struct btrfs_root *root,
999 struct btrfs_path *path,
1000 u64 objectid, u64 offset,
1002 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1003 struct btrfs_root *root, struct btrfs_path *path,
1006 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1007 int btrfs_readpage(struct file *file, struct page *page);
1008 void btrfs_delete_inode(struct inode *inode);
1009 void btrfs_read_locked_inode(struct inode *inode);
1010 int btrfs_write_inode(struct inode *inode, int wait);
1011 void btrfs_dirty_inode(struct inode *inode);
1012 struct inode *btrfs_alloc_inode(struct super_block *sb);
1013 void btrfs_destroy_inode(struct inode *inode);
1014 int btrfs_init_cachep(void);
1015 void btrfs_destroy_cachep(void);
1016 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1017 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1018 struct btrfs_root *root);
1019 int btrfs_commit_write(struct file *file, struct page *page,
1020 unsigned from, unsigned to);
1021 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1022 size_t page_offset, u64 start, u64 end,
1024 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1025 struct btrfs_root *root,
1026 struct inode *inode);
1028 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1029 extern struct file_operations btrfs_file_operations;
1030 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1031 struct btrfs_root *root, struct inode *inode,
1032 u64 start, u64 end, u64 inline_end, u64 *hint_block);
1034 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1035 struct btrfs_root *root, int cache_only);
1038 int btrfs_init_sysfs(void);
1039 void btrfs_exit_sysfs(void);
1040 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1041 int btrfs_sysfs_add_root(struct btrfs_root *root);
1042 void btrfs_sysfs_del_root(struct btrfs_root *root);
1043 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);