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 struct mutex trans_mutex;
314 struct mutex fs_mutex;
315 struct list_head trans_list;
316 struct list_head dead_roots;
317 struct delayed_work trans_work;
318 struct kobject super_kobj;
319 struct completion kobj_unregister;
325 * in ram representation of the tree. extent_root is used for all allocations
326 * and for the extent tree extent_root root.
329 struct extent_buffer *node;
330 struct extent_buffer *commit_root;
331 struct btrfs_root_item root_item;
332 struct btrfs_key root_key;
333 struct btrfs_fs_info *fs_info;
335 struct kobject root_kobj;
336 struct completion kobj_unregister;
337 struct rw_semaphore snap_sem;
341 /* data allocations are done in sectorsize units */
344 /* node allocations are done in nodesize units */
347 /* leaf allocations are done in leafsize units */
352 u64 last_inode_alloc;
354 struct btrfs_key defrag_progress;
361 * inode items have the data typically returned from stat and store other
362 * info about object characteristics. There is one for every file and dir in
365 #define BTRFS_INODE_ITEM_KEY 1
367 /* reserve 2-15 close to the inode for later flexibility */
370 * dir items are the name -> inode pointers in a directory. There is one
371 * for every name in a directory.
373 #define BTRFS_DIR_ITEM_KEY 16
374 #define BTRFS_DIR_INDEX_KEY 17
376 * extent data is for file data
378 #define BTRFS_EXTENT_DATA_KEY 18
380 * csum items have the checksums for data in the extents
382 #define BTRFS_CSUM_ITEM_KEY 19
384 /* reserve 20-31 for other file stuff */
387 * root items point to tree roots. There are typically in the root
388 * tree used by the super block to find all the other trees
390 #define BTRFS_ROOT_ITEM_KEY 32
392 * extent items are in the extent map tree. These record which blocks
393 * are used, and how many references there are to each block
395 #define BTRFS_EXTENT_ITEM_KEY 33
398 * block groups give us hints into the extent allocation trees. Which
399 * blocks are free etc etc
401 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
404 * string items are for debugging. They just store a short string of
407 #define BTRFS_STRING_ITEM_KEY 253
409 /* some macros to generate set/get funcs for the struct fields. This
410 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
413 #define le8_to_cpu(v) (v)
414 #define cpu_to_le8(v) (v)
417 #define read_eb_member(eb, ptr, type, member, result) ( \
418 read_extent_buffer(eb, (char *)(result), \
419 ((unsigned long)(ptr)) + \
420 offsetof(type, member), \
421 sizeof(((type *)0)->member)))
423 #define write_eb_member(eb, ptr, type, member, result) ( \
424 write_extent_buffer(eb, (char *)(result), \
425 ((unsigned long)(ptr)) + \
426 offsetof(type, member), \
427 sizeof(((type *)0)->member)))
429 #ifndef BTRFS_SETGET_FUNCS
430 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
431 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
432 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
435 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
436 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
438 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
439 unsigned long offset = offsetof(type, member); \
441 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
442 res = le##bits##_to_cpu(*tmp); \
443 kunmap_atomic(kaddr, KM_USER0); \
446 static inline void btrfs_set_##name(struct extent_buffer *eb, \
449 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
450 unsigned long offset = offsetof(type, member); \
451 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
452 *tmp = cpu_to_le##bits(val); \
453 kunmap_atomic(kaddr, KM_USER0); \
456 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
457 static inline u##bits btrfs_##name(type *s) \
459 return le##bits##_to_cpu(s->member); \
461 static inline void btrfs_set_##name(type *s, u##bits val) \
463 s->member = cpu_to_le##bits(val); \
466 /* struct btrfs_block_group_item */
467 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
469 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
472 /* struct btrfs_inode_item */
473 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
474 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
475 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
476 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
477 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
478 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
479 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
480 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
481 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
482 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
483 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
486 static inline struct btrfs_inode_timespec *
487 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
489 unsigned long ptr = (unsigned long)inode_item;
490 ptr += offsetof(struct btrfs_inode_item, atime);
491 return (struct btrfs_inode_timespec *)ptr;
494 static inline struct btrfs_inode_timespec *
495 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
497 unsigned long ptr = (unsigned long)inode_item;
498 ptr += offsetof(struct btrfs_inode_item, mtime);
499 return (struct btrfs_inode_timespec *)ptr;
502 static inline struct btrfs_inode_timespec *
503 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
505 unsigned long ptr = (unsigned long)inode_item;
506 ptr += offsetof(struct btrfs_inode_item, ctime);
507 return (struct btrfs_inode_timespec *)ptr;
510 static inline struct btrfs_inode_timespec *
511 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
513 unsigned long ptr = (unsigned long)inode_item;
514 ptr += offsetof(struct btrfs_inode_item, otime);
515 return (struct btrfs_inode_timespec *)ptr;
518 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
519 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
521 /* struct btrfs_extent_item */
522 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
523 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 32);
525 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
527 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
530 /* struct btrfs_node */
531 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
533 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
536 ptr = offsetof(struct btrfs_node, ptrs) +
537 sizeof(struct btrfs_key_ptr) * nr;
538 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
541 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
545 ptr = offsetof(struct btrfs_node, ptrs) +
546 sizeof(struct btrfs_key_ptr) * nr;
547 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
550 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
552 return offsetof(struct btrfs_node, ptrs) +
553 sizeof(struct btrfs_key_ptr) * nr;
556 static inline void btrfs_node_key(struct extent_buffer *eb,
557 struct btrfs_disk_key *disk_key, int nr)
560 ptr = btrfs_node_key_ptr_offset(nr);
561 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
562 struct btrfs_key_ptr, key, disk_key);
564 static inline void btrfs_set_node_key(struct extent_buffer *eb,
565 struct btrfs_disk_key *disk_key, int nr)
568 ptr = btrfs_node_key_ptr_offset(nr);
569 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
570 struct btrfs_key_ptr, key, disk_key);
573 /* struct btrfs_item */
574 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
575 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
577 static inline unsigned long btrfs_item_nr_offset(int nr)
579 return offsetof(struct btrfs_leaf, items) +
580 sizeof(struct btrfs_item) * nr;
583 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
586 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
589 static inline u32 btrfs_item_end(struct extent_buffer *eb,
590 struct btrfs_item *item)
592 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
595 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
597 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
600 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
602 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
605 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
607 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
610 static inline void btrfs_item_key(struct extent_buffer *eb,
611 struct btrfs_disk_key *disk_key, int nr)
613 struct btrfs_item *item = btrfs_item_nr(eb, nr);
614 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
617 static inline void btrfs_set_item_key(struct extent_buffer *eb,
618 struct btrfs_disk_key *disk_key, int nr)
620 struct btrfs_item *item = btrfs_item_nr(eb, nr);
621 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
624 /* struct btrfs_dir_item */
625 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
626 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
627 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
629 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
630 struct btrfs_dir_item *item,
631 struct btrfs_disk_key *key)
633 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
636 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
637 struct btrfs_dir_item *item,
638 struct btrfs_disk_key *key)
640 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
643 /* struct btrfs_disk_key */
644 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
646 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
647 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
649 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
650 struct btrfs_disk_key *disk)
652 cpu->offset = le64_to_cpu(disk->offset);
653 cpu->type = disk->type;
654 cpu->objectid = le64_to_cpu(disk->objectid);
657 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
658 struct btrfs_key *cpu)
660 disk->offset = cpu_to_le64(cpu->offset);
661 disk->type = cpu->type;
662 disk->objectid = cpu_to_le64(cpu->objectid);
665 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
666 struct btrfs_key *key, int nr)
668 struct btrfs_disk_key disk_key;
669 btrfs_node_key(eb, &disk_key, nr);
670 btrfs_disk_key_to_cpu(key, &disk_key);
673 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
674 struct btrfs_key *key, int nr)
676 struct btrfs_disk_key disk_key;
677 btrfs_item_key(eb, &disk_key, nr);
678 btrfs_disk_key_to_cpu(key, &disk_key);
681 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
682 struct btrfs_dir_item *item,
683 struct btrfs_key *key)
685 struct btrfs_disk_key disk_key;
686 btrfs_dir_item_key(eb, item, &disk_key);
687 btrfs_disk_key_to_cpu(key, &disk_key);
691 static inline u8 btrfs_key_type(struct btrfs_key *key)
696 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
701 /* struct btrfs_header */
702 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
703 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
705 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
706 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
707 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
708 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
710 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
712 unsigned long ptr = offsetof(struct btrfs_header, fsid);
716 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
718 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
722 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
724 unsigned long ptr = offsetof(struct btrfs_header, csum);
728 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
733 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
738 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
743 static inline int btrfs_is_leaf(struct extent_buffer *eb)
745 return (btrfs_header_level(eb) == 0);
748 /* struct btrfs_root_item */
749 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
750 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
751 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
753 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
754 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
755 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
756 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
757 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
758 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
759 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
761 /* struct btrfs_super_block */
762 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
763 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
765 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
766 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
768 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
770 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
772 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
774 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
776 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
778 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
779 root_dir_objectid, 64);
781 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
783 return offsetof(struct btrfs_leaf, items);
786 /* struct btrfs_file_extent_item */
787 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
789 static inline unsigned long btrfs_file_extent_inline_start(struct
790 btrfs_file_extent_item *e)
792 unsigned long offset = (unsigned long)e;
793 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
797 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
799 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
802 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
803 struct btrfs_item *e)
805 unsigned long offset;
806 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
807 return btrfs_item_size(eb, e) - offset;
810 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
812 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
814 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
816 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
818 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
821 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
823 return sb->s_fs_info;
826 static inline int btrfs_set_root_name(struct btrfs_root *root,
827 const char *name, int len)
829 /* if we already have a name just free it */
833 root->name = kmalloc(len+1, GFP_KERNEL);
837 memcpy(root->name, name, len);
838 root->name[len] ='\0';
843 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
845 return root->leafsize;
846 return root->nodesize;
849 /* helper function to cast into the data area of the leaf. */
850 #define btrfs_item_ptr(leaf, slot, type) \
851 ((type *)(btrfs_leaf_data(leaf) + \
852 btrfs_item_offset_nr(leaf, slot)))
854 #define btrfs_item_ptr_offset(leaf, slot) \
855 ((unsigned long)(btrfs_leaf_data(leaf) + \
856 btrfs_item_offset_nr(leaf, slot)))
858 /* mount option defines and helpers */
859 #define BTRFS_MOUNT_SUBVOL 0x000001
860 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
861 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
862 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
865 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
866 struct btrfs_root *root);
867 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
868 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
871 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
872 struct btrfs_block_group_cache
873 *hint, u64 search_start,
874 int data, int owner);
875 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
876 struct btrfs_root *root);
877 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
878 struct btrfs_root *root, u32 size,
879 u64 hint, u64 empty_size);
880 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
881 struct btrfs_root *root, u64 owner,
882 u64 num_bytes, u64 empty_size, u64 search_start,
883 u64 search_end, struct btrfs_key *ins, int data);
884 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
885 struct extent_buffer *buf);
886 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
887 *root, u64 bytenr, u64 num_bytes, int pin);
888 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
889 struct btrfs_root *root,
890 struct extent_map_tree *unpin);
891 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
892 struct btrfs_root *root,
893 u64 bytenr, u64 num_bytes);
894 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
895 struct btrfs_root *root);
896 int btrfs_free_block_groups(struct btrfs_fs_info *info);
897 int btrfs_read_block_groups(struct btrfs_root *root);
899 int btrfs_cow_block(struct btrfs_trans_handle *trans,
900 struct btrfs_root *root, struct extent_buffer *buf,
901 struct extent_buffer *parent, int parent_slot,
902 struct extent_buffer **cow_ret);
903 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
904 *root, struct btrfs_path *path, u32 data_size);
905 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
906 struct btrfs_root *root,
907 struct btrfs_path *path,
909 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
910 *root, struct btrfs_key *key, struct btrfs_path *p, int
912 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
913 struct btrfs_root *root, struct extent_buffer *parent,
914 int cache_only, u64 *last_ret);
915 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
916 struct btrfs_path *btrfs_alloc_path(void);
917 void btrfs_free_path(struct btrfs_path *p);
918 void btrfs_init_path(struct btrfs_path *p);
919 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
920 struct btrfs_path *path);
921 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
922 *root, struct btrfs_key *key, void *data, u32 data_size);
923 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
924 *root, struct btrfs_path *path, struct btrfs_key
925 *cpu_key, u32 data_size);
926 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
927 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
928 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
931 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
932 struct btrfs_key *key);
933 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
934 *root, struct btrfs_key *key, struct btrfs_root_item
936 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
937 *root, struct btrfs_key *key, struct btrfs_root_item
939 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
940 btrfs_root_item *item, struct btrfs_key *key);
941 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
942 struct btrfs_root *latest_root);
944 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
945 *root, const char *name, int name_len, u64 dir,
946 struct btrfs_key *location, u8 type);
947 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
948 struct btrfs_root *root,
949 struct btrfs_path *path, u64 dir,
950 const char *name, int name_len,
952 struct btrfs_dir_item *
953 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
954 struct btrfs_root *root,
955 struct btrfs_path *path, u64 dir,
956 u64 objectid, const char *name, int name_len,
958 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
959 struct btrfs_path *path,
960 const char *name, int name_len);
961 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
962 struct btrfs_root *root,
963 struct btrfs_path *path,
964 struct btrfs_dir_item *di);
966 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
967 struct btrfs_root *fs_root,
968 u64 dirid, u64 *objectid);
969 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
972 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
973 struct btrfs_root *root,
974 struct btrfs_path *path, u64 objectid);
975 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
976 *root, struct btrfs_path *path,
977 struct btrfs_key *location, int mod);
980 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
981 struct btrfs_root *root,
982 u64 objectid, u64 pos, u64 offset,
985 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
986 struct btrfs_root *root,
987 struct btrfs_path *path, u64 objectid,
988 u64 bytenr, int mod);
989 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
990 struct btrfs_root *root,
991 u64 objectid, u64 offset,
992 char *data, size_t len);
993 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
994 struct btrfs_root *root,
995 struct btrfs_path *path,
996 u64 objectid, u64 offset,
998 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
999 struct btrfs_root *root, struct btrfs_path *path,
1002 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1003 int btrfs_readpage(struct file *file, struct page *page);
1004 void btrfs_delete_inode(struct inode *inode);
1005 void btrfs_read_locked_inode(struct inode *inode);
1006 int btrfs_write_inode(struct inode *inode, int wait);
1007 void btrfs_dirty_inode(struct inode *inode);
1008 struct inode *btrfs_alloc_inode(struct super_block *sb);
1009 void btrfs_destroy_inode(struct inode *inode);
1010 int btrfs_init_cachep(void);
1011 void btrfs_destroy_cachep(void);
1012 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1013 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1014 struct btrfs_root *root);
1015 int btrfs_commit_write(struct file *file, struct page *page,
1016 unsigned from, unsigned to);
1017 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1018 size_t page_offset, u64 start, u64 end,
1020 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1021 struct btrfs_root *root,
1022 struct inode *inode);
1024 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1025 extern struct file_operations btrfs_file_operations;
1026 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1027 struct btrfs_root *root, struct inode *inode,
1028 u64 start, u64 end, u64 inline_end, u64 *hint_block);
1030 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1031 struct btrfs_root *root, int cache_only);
1034 int btrfs_init_sysfs(void);
1035 void btrfs_exit_sysfs(void);
1036 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1037 int btrfs_sysfs_add_root(struct btrfs_root *root);
1038 void btrfs_sysfs_del_root(struct btrfs_root *root);
1039 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);