2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
23 #include <linux/workqueue.h>
24 #include <linux/completion.h>
25 #include "bit-radix.h"
26 #include "extent_map.h"
28 struct btrfs_trans_handle;
29 struct btrfs_transaction;
30 extern struct kmem_cache *btrfs_trans_handle_cachep;
31 extern struct kmem_cache *btrfs_transaction_cachep;
32 extern struct kmem_cache *btrfs_bit_radix_cachep;
33 extern struct kmem_cache *btrfs_path_cachep;
35 #define BTRFS_MAGIC "_B2RfS_M"
37 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
38 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
39 #define BTRFS_FS_TREE_OBJECTID 3ULL
40 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
41 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
44 * we can actually store much bigger names, but lets not confuse the rest
47 #define BTRFS_NAME_LEN 255
49 /* 32 bytes in various csum fields */
50 #define BTRFS_CSUM_SIZE 32
51 /* four bytes for CRC32 */
52 #define BTRFS_CRC32_SIZE 4
53 #define BTRFS_EMPTY_DIR_SIZE 6
55 #define BTRFS_FT_UNKNOWN 0
56 #define BTRFS_FT_REG_FILE 1
57 #define BTRFS_FT_DIR 2
58 #define BTRFS_FT_CHRDEV 3
59 #define BTRFS_FT_BLKDEV 4
60 #define BTRFS_FT_FIFO 5
61 #define BTRFS_FT_SOCK 6
62 #define BTRFS_FT_SYMLINK 7
63 #define BTRFS_FT_MAX 8
66 * the key defines the order in the tree, and so it also defines (optimal)
67 * block layout. objectid corresonds to the inode number. The flags
68 * tells us things about the object, and is a kind of stream selector.
69 * so for a given inode, keys with flags of 1 might refer to the inode
70 * data, flags of 2 may point to file data in the btree and flags == 3
71 * may point to extents.
73 * offset is the starting byte offset for this key in the stream.
75 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
76 * in cpu native order. Otherwise they are identical and their sizes
77 * should be the same (ie both packed)
79 struct btrfs_disk_key {
83 } __attribute__ ((__packed__));
89 } __attribute__ ((__packed__));
91 #define BTRFS_FSID_SIZE 16
93 * every tree block (leaf or node) starts with this header.
96 u8 csum[BTRFS_CSUM_SIZE];
97 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
98 __le64 blocknr; /* which block this node is supposed to live in */
104 } __attribute__ ((__packed__));
106 #define BTRFS_MAX_LEVEL 8
107 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
108 sizeof(struct btrfs_header)) / \
109 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
110 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
111 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
112 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
113 sizeof(struct btrfs_item) - \
114 sizeof(struct btrfs_file_extent_item))
117 * the super block basically lists the main trees of the FS
118 * it currently lacks any block count etc etc
120 struct btrfs_super_block {
121 u8 csum[BTRFS_CSUM_SIZE];
122 /* the first 3 fields must match struct btrfs_header */
123 u8 fsid[16]; /* FS specific uuid */
124 __le64 blocknr; /* this block number */
130 __le64 root_dir_objectid;
134 } __attribute__ ((__packed__));
137 * A leaf is full of items. offset and size tell us where to find
138 * the item in the leaf (relative to the start of the data area)
141 struct btrfs_disk_key key;
144 } __attribute__ ((__packed__));
147 * leaves have an item area and a data area:
148 * [item0, item1....itemN] [free space] [dataN...data1, data0]
150 * The data is separate from the items to get the keys closer together
154 struct btrfs_header header;
155 struct btrfs_item items[];
156 } __attribute__ ((__packed__));
159 * all non-leaf blocks are nodes, they hold only keys and pointers to
162 struct btrfs_key_ptr {
163 struct btrfs_disk_key key;
165 } __attribute__ ((__packed__));
168 struct btrfs_header header;
169 struct btrfs_key_ptr ptrs[];
170 } __attribute__ ((__packed__));
173 * btrfs_paths remember the path taken from the root down to the leaf.
174 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
175 * to any other levels that are present.
177 * The slots array records the index of the item or block pointer
178 * used while walking the tree.
181 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
182 int slots[BTRFS_MAX_LEVEL];
188 * items in the extent btree are used to record the objectid of the
189 * owner of the block and the number of references
191 struct btrfs_extent_item {
194 } __attribute__ ((__packed__));
196 struct btrfs_inode_timespec {
199 } __attribute__ ((__packed__));
202 * there is no padding here on purpose. If you want to extent the inode,
203 * make a new item type
205 struct btrfs_inode_item {
217 struct btrfs_inode_timespec atime;
218 struct btrfs_inode_timespec ctime;
219 struct btrfs_inode_timespec mtime;
220 struct btrfs_inode_timespec otime;
221 } __attribute__ ((__packed__));
223 struct btrfs_dir_item {
224 struct btrfs_disk_key location;
228 } __attribute__ ((__packed__));
230 struct btrfs_root_item {
231 struct btrfs_inode_item inode;
238 struct btrfs_disk_key drop_progress;
240 } __attribute__ ((__packed__));
242 #define BTRFS_FILE_EXTENT_REG 0
243 #define BTRFS_FILE_EXTENT_INLINE 1
245 struct btrfs_file_extent_item {
249 * disk space consumed by the extent, checksum blocks are included
253 __le64 disk_num_blocks;
255 * the logical offset in file blocks (no csums)
256 * this extent record is for. This allows a file extent to point
257 * into the middle of an existing extent on disk, sharing it
258 * between two snapshots (useful if some bytes in the middle of the
259 * extent have changed
263 * the logical number of file blocks (no csums included)
266 } __attribute__ ((__packed__));
268 struct btrfs_csum_item {
270 } __attribute__ ((__packed__));
272 /* tag for the radix tree of block groups in ram */
273 #define BTRFS_BLOCK_GROUP_DIRTY 0
274 #define BTRFS_BLOCK_GROUP_AVAIL 1
275 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
278 #define BTRFS_BLOCK_GROUP_DATA 1
279 struct btrfs_block_group_item {
282 } __attribute__ ((__packed__));
284 struct btrfs_block_group_cache {
285 struct btrfs_key key;
286 struct btrfs_block_group_item item;
287 struct radix_tree_root *radix;
296 struct btrfs_fs_info {
297 u8 fsid[BTRFS_FSID_SIZE];
298 struct btrfs_root *extent_root;
299 struct btrfs_root *tree_root;
300 struct radix_tree_root fs_roots_radix;
301 struct radix_tree_root pending_del_radix;
302 struct radix_tree_root pinned_radix;
303 struct radix_tree_root block_group_radix;
304 struct radix_tree_root block_group_data_radix;
305 struct radix_tree_root extent_map_radix;
306 struct radix_tree_root extent_ins_radix;
308 u64 last_trans_committed;
309 struct btrfs_transaction *running_transaction;
310 struct btrfs_super_block super_copy;
311 struct extent_buffer *sb_buffer;
312 struct super_block *sb;
313 struct inode *btree_inode;
314 struct mutex trans_mutex;
315 struct mutex fs_mutex;
316 struct list_head trans_list;
317 struct list_head dead_roots;
318 struct delayed_work trans_work;
319 struct kobject super_kobj;
320 struct completion kobj_unregister;
326 * in ram representation of the tree. extent_root is used for all allocations
327 * and for the extent tree extent_root root.
330 struct extent_buffer *node;
331 struct extent_buffer *commit_root;
332 struct btrfs_root_item root_item;
333 struct btrfs_key root_key;
334 struct btrfs_fs_info *fs_info;
336 struct kobject root_kobj;
337 struct completion kobj_unregister;
338 struct rw_semaphore snap_sem;
342 /* data allocations are done in sectorsize units */
345 /* node allocations are done in nodesize units */
348 /* leaf allocations are done in leafsize units */
353 u64 last_inode_alloc;
355 struct btrfs_key defrag_progress;
362 * inode items have the data typically returned from stat and store other
363 * info about object characteristics. There is one for every file and dir in
366 #define BTRFS_INODE_ITEM_KEY 1
368 /* reserve 2-15 close to the inode for later flexibility */
371 * dir items are the name -> inode pointers in a directory. There is one
372 * for every name in a directory.
374 #define BTRFS_DIR_ITEM_KEY 16
375 #define BTRFS_DIR_INDEX_KEY 17
377 * extent data is for file data
379 #define BTRFS_EXTENT_DATA_KEY 18
381 * csum items have the checksums for data in the extents
383 #define BTRFS_CSUM_ITEM_KEY 19
385 /* reserve 20-31 for other file stuff */
388 * root items point to tree roots. There are typically in the root
389 * tree used by the super block to find all the other trees
391 #define BTRFS_ROOT_ITEM_KEY 32
393 * extent items are in the extent map tree. These record which blocks
394 * are used, and how many references there are to each block
396 #define BTRFS_EXTENT_ITEM_KEY 33
399 * block groups give us hints into the extent allocation trees. Which
400 * blocks are free etc etc
402 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
405 * string items are for debugging. They just store a short string of
408 #define BTRFS_STRING_ITEM_KEY 253
410 /* some macros to generate set/get funcs for the struct fields. This
411 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
414 #define le8_to_cpu(v) (v)
415 #define cpu_to_le8(v) (v)
418 #define read_eb_member(eb, ptr, type, member, result) ( \
419 read_extent_buffer(eb, (char *)(result), \
420 ((unsigned long)(ptr)) + \
421 offsetof(type, member), \
422 sizeof(((type *)0)->member)))
424 #define write_eb_member(eb, ptr, type, member, result) ( \
425 write_extent_buffer(eb, (char *)(result), \
426 ((unsigned long)(ptr)) + \
427 offsetof(type, member), \
428 sizeof(((type *)0)->member)))
430 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
431 static inline u##bits btrfs_##name(struct extent_buffer *eb, \
435 read_eb_member(eb, s, type, member, &res); \
436 return le##bits##_to_cpu(res); \
438 static inline void btrfs_set_##name(struct extent_buffer *eb, \
439 type *s, u##bits val) \
441 val = cpu_to_le##bits(val); \
442 write_eb_member(eb, s, type, member, &val); \
445 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
446 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
449 read_eb_member(eb, NULL, type, member, &res); \
450 return le##bits##_to_cpu(res); \
452 static inline void btrfs_set_##name(struct extent_buffer *eb, \
455 val = cpu_to_le##bits(val); \
456 write_eb_member(eb, NULL, type, member, &val); \
459 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
460 static inline u##bits btrfs_##name(type *s) \
462 return le##bits##_to_cpu(s->member); \
464 static inline void btrfs_set_##name(type *s, u##bits val) \
466 s->member = cpu_to_le##bits(val); \
469 /* struct btrfs_block_group_item */
470 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
472 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
475 /* struct btrfs_inode_item */
476 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
477 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
478 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
479 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
480 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
481 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
482 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
483 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
484 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
485 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
486 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
489 static inline struct btrfs_inode_timespec *
490 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
492 unsigned long ptr = (unsigned long)inode_item;
493 ptr += offsetof(struct btrfs_inode_item, atime);
494 return (struct btrfs_inode_timespec *)ptr;
497 static inline struct btrfs_inode_timespec *
498 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
500 unsigned long ptr = (unsigned long)inode_item;
501 ptr += offsetof(struct btrfs_inode_item, mtime);
502 return (struct btrfs_inode_timespec *)ptr;
505 static inline struct btrfs_inode_timespec *
506 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
508 unsigned long ptr = (unsigned long)inode_item;
509 ptr += offsetof(struct btrfs_inode_item, ctime);
510 return (struct btrfs_inode_timespec *)ptr;
513 static inline struct btrfs_inode_timespec *
514 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
516 unsigned long ptr = (unsigned long)inode_item;
517 ptr += offsetof(struct btrfs_inode_item, otime);
518 return (struct btrfs_inode_timespec *)ptr;
521 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
522 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
524 /* struct btrfs_extent_item */
525 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
526 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 32);
528 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
530 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
533 /* struct btrfs_node */
534 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
536 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
539 ptr = offsetof(struct btrfs_node, ptrs) +
540 sizeof(struct btrfs_key_ptr) * nr;
541 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
544 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
548 ptr = offsetof(struct btrfs_node, ptrs) +
549 sizeof(struct btrfs_key_ptr) * nr;
550 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
553 static unsigned long btrfs_node_key_ptr_offset(int nr)
555 return offsetof(struct btrfs_node, ptrs) +
556 sizeof(struct btrfs_key_ptr) * nr;
559 static void btrfs_node_key(struct extent_buffer *eb,
560 struct btrfs_disk_key *disk_key, int nr)
563 ptr = btrfs_node_key_ptr_offset(nr);
564 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
565 struct btrfs_key_ptr, key, disk_key);
567 static inline void btrfs_set_node_key(struct extent_buffer *eb,
568 struct btrfs_disk_key *disk_key, int nr)
571 ptr = btrfs_node_key_ptr_offset(nr);
572 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
573 struct btrfs_key_ptr, key, disk_key);
576 /* struct btrfs_item */
577 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
578 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
580 static inline unsigned long btrfs_item_nr_offset(int nr)
582 return offsetof(struct btrfs_leaf, items) +
583 sizeof(struct btrfs_item) * nr;
586 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
589 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
592 static inline u32 btrfs_item_end(struct extent_buffer *eb,
593 struct btrfs_item *item)
595 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
598 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
600 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
603 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
605 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
608 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
610 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
613 static inline void btrfs_item_key(struct extent_buffer *eb,
614 struct btrfs_disk_key *disk_key, int nr)
616 struct btrfs_item *item = btrfs_item_nr(eb, nr);
617 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
620 static inline void btrfs_set_item_key(struct extent_buffer *eb,
621 struct btrfs_disk_key *disk_key, int nr)
623 struct btrfs_item *item = btrfs_item_nr(eb, nr);
624 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
627 /* struct btrfs_dir_item */
628 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
629 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
630 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
632 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
633 struct btrfs_dir_item *item,
634 struct btrfs_disk_key *key)
636 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
639 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
640 struct btrfs_dir_item *item,
641 struct btrfs_disk_key *key)
643 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
646 /* struct btrfs_disk_key */
647 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
649 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
650 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
652 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
653 struct btrfs_disk_key *disk)
655 cpu->offset = le64_to_cpu(disk->offset);
656 cpu->type = disk->type;
657 cpu->objectid = le64_to_cpu(disk->objectid);
660 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
661 struct btrfs_key *cpu)
663 disk->offset = cpu_to_le64(cpu->offset);
664 disk->type = cpu->type;
665 disk->objectid = cpu_to_le64(cpu->objectid);
668 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
669 struct btrfs_key *key, int nr)
671 struct btrfs_disk_key disk_key;
672 btrfs_node_key(eb, &disk_key, nr);
673 btrfs_disk_key_to_cpu(key, &disk_key);
676 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
677 struct btrfs_key *key, int nr)
679 struct btrfs_disk_key disk_key;
680 btrfs_item_key(eb, &disk_key, nr);
681 btrfs_disk_key_to_cpu(key, &disk_key);
684 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
685 struct btrfs_dir_item *item,
686 struct btrfs_key *key)
688 struct btrfs_disk_key disk_key;
689 btrfs_dir_item_key(eb, item, &disk_key);
690 btrfs_disk_key_to_cpu(key, &disk_key);
694 static inline u8 btrfs_key_type(struct btrfs_key *key)
699 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
704 /* struct btrfs_header */
705 BTRFS_SETGET_HEADER_FUNCS(header_blocknr, struct btrfs_header, blocknr, 64);
706 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
708 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
709 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
710 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
711 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
713 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
715 unsigned long ptr = offsetof(struct btrfs_header, fsid);
719 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
721 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
725 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
727 unsigned long ptr = offsetof(struct btrfs_header, csum);
731 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
736 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
741 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
746 static inline int btrfs_is_leaf(struct extent_buffer *eb)
748 return (btrfs_header_level(eb) == 0);
751 /* struct btrfs_root_item */
752 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
753 BTRFS_SETGET_FUNCS(disk_root_blocknr, struct btrfs_root_item, blocknr, 64);
755 BTRFS_SETGET_STACK_FUNCS(root_blocknr, struct btrfs_root_item, blocknr, 64);
756 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
757 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
758 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
759 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, blocks_used, 64);
760 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, block_limit, 64);
762 /* struct btrfs_super_block */
763 BTRFS_SETGET_STACK_FUNCS(super_blocknr, struct btrfs_super_block, blocknr, 64);
764 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
766 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
767 BTRFS_SETGET_STACK_FUNCS(super_total_blocks, struct btrfs_super_block,
769 BTRFS_SETGET_STACK_FUNCS(super_blocks_used, struct btrfs_super_block,
771 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
773 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
775 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
777 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
778 root_dir_objectid, 64);
780 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
782 return offsetof(struct btrfs_leaf, items);
785 /* struct btrfs_file_extent_item */
786 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
788 static inline unsigned long btrfs_file_extent_inline_start(struct
789 btrfs_file_extent_item *e)
791 unsigned long offset = (unsigned long)e;
792 offset += offsetof(struct btrfs_file_extent_item, disk_blocknr);
796 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
798 return offsetof(struct btrfs_file_extent_item, disk_blocknr) + datasize;
801 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
802 struct btrfs_item *e)
804 unsigned long offset;
805 offset = offsetof(struct btrfs_file_extent_item, disk_blocknr);
806 return btrfs_item_size(eb, e) - offset;
809 BTRFS_SETGET_FUNCS(file_extent_disk_blocknr, struct btrfs_file_extent_item,
811 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
813 BTRFS_SETGET_FUNCS(file_extent_disk_num_blocks, struct btrfs_file_extent_item,
814 disk_num_blocks, 64);
815 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
817 BTRFS_SETGET_FUNCS(file_extent_num_blocks, struct btrfs_file_extent_item,
820 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
822 return sb->s_fs_info;
825 static inline int btrfs_set_root_name(struct btrfs_root *root,
826 const char *name, int len)
828 /* if we already have a name just free it */
832 root->name = kmalloc(len+1, GFP_KERNEL);
836 memcpy(root->name, name, len);
837 root->name[len] ='\0';
842 /* helper function to cast into the data area of the leaf. */
843 #define btrfs_item_ptr(leaf, slot, type) \
844 ((type *)(btrfs_leaf_data(leaf) + \
845 btrfs_item_offset_nr(leaf, slot)))
847 #define btrfs_item_ptr_offset(leaf, slot) \
848 ((unsigned long)(btrfs_leaf_data(leaf) + \
849 btrfs_item_offset_nr(leaf, slot)))
851 /* mount option defines and helpers */
852 #define BTRFS_MOUNT_SUBVOL 0x000001
853 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
854 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
855 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
858 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
859 struct btrfs_root *root);
860 int btrfs_copy_pinned(struct btrfs_root *root, struct radix_tree_root *copy);
861 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
864 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
865 struct btrfs_block_group_cache
866 *hint, u64 search_start,
867 int data, int owner);
868 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
869 struct btrfs_root *root);
870 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
871 struct btrfs_root *root, u64 hint,
873 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
874 struct btrfs_root *root, u64 owner,
875 u64 num_blocks, u64 empty_size, u64 search_start,
876 u64 search_end, struct btrfs_key *ins, int data);
877 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
878 struct extent_buffer *buf);
879 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
880 *root, u64 blocknr, u64 num_blocks, int pin);
881 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
882 struct btrfs_root *root,
883 struct radix_tree_root *unpin_radix);
884 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
885 struct btrfs_root *root,
886 u64 blocknr, u64 num_blocks);
887 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
888 struct btrfs_root *root);
889 int btrfs_free_block_groups(struct btrfs_fs_info *info);
890 int btrfs_read_block_groups(struct btrfs_root *root);
892 int btrfs_cow_block(struct btrfs_trans_handle *trans,
893 struct btrfs_root *root, struct extent_buffer *buf,
894 struct extent_buffer *parent, int parent_slot,
895 struct extent_buffer **cow_ret);
896 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
897 *root, struct btrfs_path *path, u32 data_size);
898 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
899 struct btrfs_root *root,
900 struct btrfs_path *path,
902 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
903 *root, struct btrfs_key *key, struct btrfs_path *p, int
905 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
906 struct btrfs_root *root, struct extent_buffer *parent,
907 int cache_only, u64 *last_ret);
908 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
909 struct btrfs_path *btrfs_alloc_path(void);
910 void btrfs_free_path(struct btrfs_path *p);
911 void btrfs_init_path(struct btrfs_path *p);
912 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
913 struct btrfs_path *path);
914 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
915 *root, struct btrfs_key *key, void *data, u32 data_size);
916 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
917 *root, struct btrfs_path *path, struct btrfs_key
918 *cpu_key, u32 data_size);
919 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
920 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
921 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
924 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
925 struct btrfs_key *key);
926 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
927 *root, struct btrfs_key *key, struct btrfs_root_item
929 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
930 *root, struct btrfs_key *key, struct btrfs_root_item
932 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
933 btrfs_root_item *item, struct btrfs_key *key);
934 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
935 struct btrfs_root *latest_root);
937 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
938 *root, const char *name, int name_len, u64 dir,
939 struct btrfs_key *location, u8 type);
940 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
941 struct btrfs_root *root,
942 struct btrfs_path *path, u64 dir,
943 const char *name, int name_len,
945 struct btrfs_dir_item *
946 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
947 struct btrfs_root *root,
948 struct btrfs_path *path, u64 dir,
949 u64 objectid, const char *name, int name_len,
951 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
952 struct btrfs_path *path,
953 const char *name, int name_len);
954 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
955 struct btrfs_root *root,
956 struct btrfs_path *path,
957 struct btrfs_dir_item *di);
959 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
960 struct btrfs_root *fs_root,
961 u64 dirid, u64 *objectid);
962 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
965 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
966 struct btrfs_root *root,
967 struct btrfs_path *path, u64 objectid);
968 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
969 *root, struct btrfs_path *path,
970 struct btrfs_key *location, int mod);
973 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
974 struct btrfs_root *root,
975 u64 objectid, u64 pos, u64 offset,
978 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
979 struct btrfs_root *root,
980 struct btrfs_path *path, u64 objectid,
981 u64 blocknr, int mod);
982 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
983 struct btrfs_root *root,
984 u64 objectid, u64 offset,
985 char *data, size_t len);
986 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
987 struct btrfs_root *root,
988 struct btrfs_path *path,
989 u64 objectid, u64 offset,
991 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
992 struct btrfs_root *root, struct btrfs_path *path,
995 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
996 int btrfs_readpage(struct file *file, struct page *page);
997 void btrfs_delete_inode(struct inode *inode);
998 void btrfs_read_locked_inode(struct inode *inode);
999 int btrfs_write_inode(struct inode *inode, int wait);
1000 void btrfs_dirty_inode(struct inode *inode);
1001 struct inode *btrfs_alloc_inode(struct super_block *sb);
1002 void btrfs_destroy_inode(struct inode *inode);
1003 int btrfs_init_cachep(void);
1004 void btrfs_destroy_cachep(void);
1005 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1006 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1007 struct btrfs_root *root);
1008 int btrfs_commit_write(struct file *file, struct page *page,
1009 unsigned from, unsigned to);
1010 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1011 size_t page_offset, u64 start, u64 end,
1013 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1014 struct btrfs_root *root,
1015 struct inode *inode);
1017 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1018 extern struct file_operations btrfs_file_operations;
1019 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1020 struct btrfs_root *root, struct inode *inode,
1021 u64 start, u64 end, u64 *hint_block);
1023 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1024 struct btrfs_root *root, int cache_only);
1027 int btrfs_init_sysfs(void);
1028 void btrfs_exit_sysfs(void);
1029 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1030 int btrfs_sysfs_add_root(struct btrfs_root *root);
1031 void btrfs_sysfs_del_root(struct btrfs_root *root);
1032 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);