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_XATTR 8
67 #define BTRFS_FT_MAX 9
70 * the key defines the order in the tree, and so it also defines (optimal)
71 * block layout. objectid corresonds to the inode number. The flags
72 * tells us things about the object, and is a kind of stream selector.
73 * so for a given inode, keys with flags of 1 might refer to the inode
74 * data, flags of 2 may point to file data in the btree and flags == 3
75 * may point to extents.
77 * offset is the starting byte offset for this key in the stream.
79 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
80 * in cpu native order. Otherwise they are identical and their sizes
81 * should be the same (ie both packed)
83 struct btrfs_disk_key {
87 } __attribute__ ((__packed__));
93 } __attribute__ ((__packed__));
95 #define BTRFS_FSID_SIZE 16
97 * every tree block (leaf or node) starts with this header.
100 u8 csum[BTRFS_CSUM_SIZE];
101 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
102 __le64 bytenr; /* which block this node is supposed to live in */
108 } __attribute__ ((__packed__));
110 #define BTRFS_MAX_LEVEL 8
111 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
112 sizeof(struct btrfs_header)) / \
113 sizeof(struct btrfs_key_ptr))
114 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
115 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
116 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
117 sizeof(struct btrfs_item) - \
118 sizeof(struct btrfs_file_extent_item))
121 * the super block basically lists the main trees of the FS
122 * it currently lacks any block count etc etc
124 struct btrfs_super_block {
125 u8 csum[BTRFS_CSUM_SIZE];
126 /* the first 3 fields must match struct btrfs_header */
127 u8 fsid[16]; /* FS specific uuid */
128 __le64 bytenr; /* this block number */
134 __le64 root_dir_objectid;
140 } __attribute__ ((__packed__));
143 * A leaf is full of items. offset and size tell us where to find
144 * the item in the leaf (relative to the start of the data area)
147 struct btrfs_disk_key key;
150 } __attribute__ ((__packed__));
153 * leaves have an item area and a data area:
154 * [item0, item1....itemN] [free space] [dataN...data1, data0]
156 * The data is separate from the items to get the keys closer together
160 struct btrfs_header header;
161 struct btrfs_item items[];
162 } __attribute__ ((__packed__));
165 * all non-leaf blocks are nodes, they hold only keys and pointers to
168 struct btrfs_key_ptr {
169 struct btrfs_disk_key key;
172 } __attribute__ ((__packed__));
175 struct btrfs_header header;
176 struct btrfs_key_ptr ptrs[];
177 } __attribute__ ((__packed__));
180 * btrfs_paths remember the path taken from the root down to the leaf.
181 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
182 * to any other levels that are present.
184 * The slots array records the index of the item or block pointer
185 * used while walking the tree.
188 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
189 int slots[BTRFS_MAX_LEVEL];
195 * items in the extent btree are used to record the objectid of the
196 * owner of the block and the number of references
198 struct btrfs_extent_item {
200 } __attribute__ ((__packed__));
202 struct btrfs_extent_ref {
207 } __attribute__ ((__packed__));
209 struct btrfs_inode_timespec {
212 } __attribute__ ((__packed__));
215 * there is no padding here on purpose. If you want to extent the inode,
216 * make a new item type
218 struct btrfs_inode_item {
230 struct btrfs_inode_timespec atime;
231 struct btrfs_inode_timespec ctime;
232 struct btrfs_inode_timespec mtime;
233 struct btrfs_inode_timespec otime;
234 } __attribute__ ((__packed__));
236 struct btrfs_dir_item {
237 struct btrfs_disk_key location;
241 } __attribute__ ((__packed__));
243 struct btrfs_root_item {
244 struct btrfs_inode_item inode;
251 struct btrfs_disk_key drop_progress;
254 } __attribute__ ((__packed__));
256 #define BTRFS_FILE_EXTENT_REG 0
257 #define BTRFS_FILE_EXTENT_INLINE 1
259 struct btrfs_file_extent_item {
263 * disk space consumed by the extent, checksum blocks are included
267 __le64 disk_num_bytes;
269 * the logical offset in file blocks (no csums)
270 * this extent record is for. This allows a file extent to point
271 * into the middle of an existing extent on disk, sharing it
272 * between two snapshots (useful if some bytes in the middle of the
273 * extent have changed
277 * the logical number of file blocks (no csums included)
280 } __attribute__ ((__packed__));
282 struct btrfs_csum_item {
284 } __attribute__ ((__packed__));
286 /* tag for the radix tree of block groups in ram */
287 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
290 #define BTRFS_BLOCK_GROUP_DATA 1
291 #define BTRFS_BLOCK_GROUP_MIXED 2
293 struct btrfs_block_group_item {
296 } __attribute__ ((__packed__));
298 struct btrfs_block_group_cache {
299 struct btrfs_key key;
300 struct btrfs_block_group_item item;
305 struct btrfs_fs_info {
306 u8 fsid[BTRFS_FSID_SIZE];
307 struct btrfs_root *extent_root;
308 struct btrfs_root *tree_root;
309 struct radix_tree_root fs_roots_radix;
311 struct extent_map_tree free_space_cache;
312 struct extent_map_tree block_group_cache;
313 struct extent_map_tree pinned_extents;
314 struct extent_map_tree pending_del;
315 struct extent_map_tree extent_ins;
318 u64 last_trans_committed;
319 struct btrfs_transaction *running_transaction;
320 struct btrfs_super_block super_copy;
321 struct extent_buffer *sb_buffer;
322 struct super_block *sb;
323 struct inode *btree_inode;
324 spinlock_t hash_lock;
325 struct mutex trans_mutex;
326 struct mutex fs_mutex;
327 struct list_head trans_list;
328 struct list_head hashers;
329 struct list_head dead_roots;
330 struct delayed_work trans_work;
331 struct kobject super_kobj;
332 struct completion kobj_unregister;
339 * in ram representation of the tree. extent_root is used for all allocations
340 * and for the extent tree extent_root root.
343 struct extent_buffer *node;
344 struct extent_buffer *commit_root;
345 struct btrfs_root_item root_item;
346 struct btrfs_key root_key;
347 struct btrfs_fs_info *fs_info;
349 struct kobject root_kobj;
350 struct completion kobj_unregister;
351 struct rw_semaphore snap_sem;
355 /* data allocations are done in sectorsize units */
358 /* node allocations are done in nodesize units */
361 /* leaf allocations are done in leafsize units */
368 u64 last_inode_alloc;
370 struct btrfs_key defrag_progress;
377 * inode items have the data typically returned from stat and store other
378 * info about object characteristics. There is one for every file and dir in
381 #define BTRFS_INODE_ITEM_KEY 1
382 #define BTRFS_XATTR_ITEM_KEY 2
383 /* reserve 2-15 close to the inode for later flexibility */
386 * dir items are the name -> inode pointers in a directory. There is one
387 * for every name in a directory.
389 #define BTRFS_DIR_ITEM_KEY 16
390 #define BTRFS_DIR_INDEX_KEY 17
392 * extent data is for file data
394 #define BTRFS_EXTENT_DATA_KEY 18
396 * csum items have the checksums for data in the extents
398 #define BTRFS_CSUM_ITEM_KEY 19
400 /* reserve 20-31 for other file stuff */
403 * root items point to tree roots. There are typically in the root
404 * tree used by the super block to find all the other trees
406 #define BTRFS_ROOT_ITEM_KEY 32
408 * extent items are in the extent map tree. These record which blocks
409 * are used, and how many references there are to each block
411 #define BTRFS_EXTENT_ITEM_KEY 33
412 #define BTRFS_EXTENT_REF_KEY 34
415 * block groups give us hints into the extent allocation trees. Which
416 * blocks are free etc etc
418 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
421 * string items are for debugging. They just store a short string of
424 #define BTRFS_STRING_ITEM_KEY 253
426 /* some macros to generate set/get funcs for the struct fields. This
427 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
430 #define le8_to_cpu(v) (v)
431 #define cpu_to_le8(v) (v)
434 #define read_eb_member(eb, ptr, type, member, result) ( \
435 read_extent_buffer(eb, (char *)(result), \
436 ((unsigned long)(ptr)) + \
437 offsetof(type, member), \
438 sizeof(((type *)0)->member)))
440 #define write_eb_member(eb, ptr, type, member, result) ( \
441 write_extent_buffer(eb, (char *)(result), \
442 ((unsigned long)(ptr)) + \
443 offsetof(type, member), \
444 sizeof(((type *)0)->member)))
446 #ifndef BTRFS_SETGET_FUNCS
447 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
448 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
449 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
452 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
453 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
455 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
456 unsigned long offset = offsetof(type, member); \
458 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
459 res = le##bits##_to_cpu(*tmp); \
460 kunmap_atomic(kaddr, KM_USER0); \
463 static inline void btrfs_set_##name(struct extent_buffer *eb, \
466 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
467 unsigned long offset = offsetof(type, member); \
468 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
469 *tmp = cpu_to_le##bits(val); \
470 kunmap_atomic(kaddr, KM_USER0); \
473 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
474 static inline u##bits btrfs_##name(type *s) \
476 return le##bits##_to_cpu(s->member); \
478 static inline void btrfs_set_##name(type *s, u##bits val) \
480 s->member = cpu_to_le##bits(val); \
483 /* struct btrfs_block_group_item */
484 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
486 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
489 /* struct btrfs_inode_item */
490 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
491 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
492 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
493 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
494 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
495 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
496 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
497 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
498 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
499 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
500 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
503 static inline struct btrfs_inode_timespec *
504 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
506 unsigned long ptr = (unsigned long)inode_item;
507 ptr += offsetof(struct btrfs_inode_item, atime);
508 return (struct btrfs_inode_timespec *)ptr;
511 static inline struct btrfs_inode_timespec *
512 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
514 unsigned long ptr = (unsigned long)inode_item;
515 ptr += offsetof(struct btrfs_inode_item, mtime);
516 return (struct btrfs_inode_timespec *)ptr;
519 static inline struct btrfs_inode_timespec *
520 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
522 unsigned long ptr = (unsigned long)inode_item;
523 ptr += offsetof(struct btrfs_inode_item, ctime);
524 return (struct btrfs_inode_timespec *)ptr;
527 static inline struct btrfs_inode_timespec *
528 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
530 unsigned long ptr = (unsigned long)inode_item;
531 ptr += offsetof(struct btrfs_inode_item, otime);
532 return (struct btrfs_inode_timespec *)ptr;
535 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
536 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
538 /* struct btrfs_extent_item */
539 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
541 /* struct btrfs_extent_ref */
542 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
543 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
544 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
545 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
547 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
548 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
550 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
552 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
554 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
557 /* struct btrfs_node */
558 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
559 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
561 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
564 ptr = offsetof(struct btrfs_node, ptrs) +
565 sizeof(struct btrfs_key_ptr) * nr;
566 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
569 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
573 ptr = offsetof(struct btrfs_node, ptrs) +
574 sizeof(struct btrfs_key_ptr) * nr;
575 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
578 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
581 ptr = offsetof(struct btrfs_node, ptrs) +
582 sizeof(struct btrfs_key_ptr) * nr;
583 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
586 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
590 ptr = offsetof(struct btrfs_node, ptrs) +
591 sizeof(struct btrfs_key_ptr) * nr;
592 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
595 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
597 return offsetof(struct btrfs_node, ptrs) +
598 sizeof(struct btrfs_key_ptr) * nr;
601 void btrfs_node_key(struct extent_buffer *eb,
602 struct btrfs_disk_key *disk_key, int nr);
604 static inline void btrfs_set_node_key(struct extent_buffer *eb,
605 struct btrfs_disk_key *disk_key, int nr)
608 ptr = btrfs_node_key_ptr_offset(nr);
609 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
610 struct btrfs_key_ptr, key, disk_key);
613 /* struct btrfs_item */
614 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
615 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
617 static inline unsigned long btrfs_item_nr_offset(int nr)
619 return offsetof(struct btrfs_leaf, items) +
620 sizeof(struct btrfs_item) * nr;
623 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
626 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
629 static inline u32 btrfs_item_end(struct extent_buffer *eb,
630 struct btrfs_item *item)
632 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
635 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
637 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
640 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
642 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
645 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
647 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
650 static inline void btrfs_item_key(struct extent_buffer *eb,
651 struct btrfs_disk_key *disk_key, int nr)
653 struct btrfs_item *item = btrfs_item_nr(eb, nr);
654 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
657 static inline void btrfs_set_item_key(struct extent_buffer *eb,
658 struct btrfs_disk_key *disk_key, int nr)
660 struct btrfs_item *item = btrfs_item_nr(eb, nr);
661 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
664 /* struct btrfs_dir_item */
665 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
666 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
667 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
669 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
670 struct btrfs_dir_item *item,
671 struct btrfs_disk_key *key)
673 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
676 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
677 struct btrfs_dir_item *item,
678 struct btrfs_disk_key *key)
680 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
683 /* struct btrfs_disk_key */
684 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
686 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
687 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
689 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
690 struct btrfs_disk_key *disk)
692 cpu->offset = le64_to_cpu(disk->offset);
693 cpu->type = disk->type;
694 cpu->objectid = le64_to_cpu(disk->objectid);
697 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
698 struct btrfs_key *cpu)
700 disk->offset = cpu_to_le64(cpu->offset);
701 disk->type = cpu->type;
702 disk->objectid = cpu_to_le64(cpu->objectid);
705 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
706 struct btrfs_key *key, int nr)
708 struct btrfs_disk_key disk_key;
709 btrfs_node_key(eb, &disk_key, nr);
710 btrfs_disk_key_to_cpu(key, &disk_key);
713 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
714 struct btrfs_key *key, int nr)
716 struct btrfs_disk_key disk_key;
717 btrfs_item_key(eb, &disk_key, nr);
718 btrfs_disk_key_to_cpu(key, &disk_key);
721 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
722 struct btrfs_dir_item *item,
723 struct btrfs_key *key)
725 struct btrfs_disk_key disk_key;
726 btrfs_dir_item_key(eb, item, &disk_key);
727 btrfs_disk_key_to_cpu(key, &disk_key);
731 static inline u8 btrfs_key_type(struct btrfs_key *key)
736 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
741 /* struct btrfs_header */
742 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
743 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
745 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
746 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
747 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
748 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
750 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
752 unsigned long ptr = offsetof(struct btrfs_header, fsid);
756 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
758 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
762 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
764 unsigned long ptr = offsetof(struct btrfs_header, csum);
768 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
773 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
778 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
783 static inline int btrfs_is_leaf(struct extent_buffer *eb)
785 return (btrfs_header_level(eb) == 0);
788 /* struct btrfs_root_item */
789 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
790 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
791 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
793 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
794 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
795 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
796 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
797 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
798 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
799 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
801 /* struct btrfs_super_block */
802 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
803 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
805 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
806 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
808 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
810 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
812 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
814 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
816 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
818 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
820 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
821 root_dir_objectid, 64);
823 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
825 return offsetof(struct btrfs_leaf, items);
828 /* struct btrfs_file_extent_item */
829 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
831 static inline unsigned long btrfs_file_extent_inline_start(struct
832 btrfs_file_extent_item *e)
834 unsigned long offset = (unsigned long)e;
835 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
839 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
841 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
844 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
845 struct btrfs_item *e)
847 unsigned long offset;
848 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
849 return btrfs_item_size(eb, e) - offset;
852 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
854 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
856 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
858 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
860 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
863 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
865 return sb->s_fs_info;
868 static inline int btrfs_set_root_name(struct btrfs_root *root,
869 const char *name, int len)
871 /* if we already have a name just free it */
875 root->name = kmalloc(len+1, GFP_KERNEL);
879 memcpy(root->name, name, len);
880 root->name[len] ='\0';
885 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
887 return root->leafsize;
888 return root->nodesize;
891 /* helper function to cast into the data area of the leaf. */
892 #define btrfs_item_ptr(leaf, slot, type) \
893 ((type *)(btrfs_leaf_data(leaf) + \
894 btrfs_item_offset_nr(leaf, slot)))
896 #define btrfs_item_ptr_offset(leaf, slot) \
897 ((unsigned long)(btrfs_leaf_data(leaf) + \
898 btrfs_item_offset_nr(leaf, slot)))
900 /* mount option defines and helpers */
901 #define BTRFS_MOUNT_SUBVOL 0x000001
902 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
903 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
904 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
907 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
908 struct btrfs_root *root);
909 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
910 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
913 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
914 struct btrfs_block_group_cache
915 *hint, u64 search_start,
916 int data, int owner);
917 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
918 struct btrfs_root *root, u64 owner_objectid);
919 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
920 struct btrfs_root *root, u32 size,
922 u64 hint, u64 empty_size);
923 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
924 struct btrfs_root *root,
932 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
933 struct btrfs_root *root,
934 struct btrfs_path *path, u64 bytenr,
935 u64 root_objectid, u64 ref_generation,
936 u64 owner, u64 owner_offset);
937 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
938 struct btrfs_root *root,
939 u64 num_bytes, u64 root_objectid, u64 ref_generation,
940 u64 owner, u64 owner_offset,
941 u64 empty_size, u64 hint_byte,
942 u64 search_end, struct btrfs_key *ins, int data);
943 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
944 struct extent_buffer *buf);
945 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
946 *root, u64 bytenr, u64 num_bytes,
947 u64 root_objectid, u64 ref_generation,
948 u64 owner_objectid, u64 owner_offset, int pin);
949 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
950 struct btrfs_root *root,
951 struct extent_map_tree *unpin);
952 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
953 struct btrfs_root *root,
954 u64 bytenr, u64 num_bytes,
955 u64 root_objectid, u64 ref_generation,
956 u64 owner, u64 owner_offset);
957 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
958 struct btrfs_root *root);
959 int btrfs_free_block_groups(struct btrfs_fs_info *info);
960 int btrfs_read_block_groups(struct btrfs_root *root);
962 int btrfs_cow_block(struct btrfs_trans_handle *trans,
963 struct btrfs_root *root, struct extent_buffer *buf,
964 struct extent_buffer *parent, int parent_slot,
965 struct extent_buffer **cow_ret);
966 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
967 *root, struct btrfs_path *path, u32 data_size);
968 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
969 struct btrfs_root *root,
970 struct btrfs_path *path,
971 u32 new_size, int from_end);
972 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
973 *root, struct btrfs_key *key, struct btrfs_path *p, int
975 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
976 struct btrfs_root *root, struct extent_buffer *parent,
977 int start_slot, int cache_only, u64 *last_ret,
978 struct btrfs_key *progress);
979 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
980 struct btrfs_path *btrfs_alloc_path(void);
981 void btrfs_free_path(struct btrfs_path *p);
982 void btrfs_init_path(struct btrfs_path *p);
983 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
984 struct btrfs_path *path);
985 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
986 *root, struct btrfs_key *key, void *data, u32 data_size);
987 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
988 *root, struct btrfs_path *path, struct btrfs_key
989 *cpu_key, u32 data_size);
990 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
991 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
992 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
993 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
996 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
997 struct btrfs_key *key);
998 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
999 *root, struct btrfs_key *key, struct btrfs_root_item
1001 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1002 *root, struct btrfs_key *key, struct btrfs_root_item
1004 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1005 btrfs_root_item *item, struct btrfs_key *key);
1006 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1007 struct btrfs_root *latest_root);
1009 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1010 *root, const char *name, int name_len, u64 dir,
1011 struct btrfs_key *location, u8 type);
1012 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1013 struct btrfs_root *root,
1014 struct btrfs_path *path, u64 dir,
1015 const char *name, int name_len,
1017 struct btrfs_dir_item *
1018 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1019 struct btrfs_root *root,
1020 struct btrfs_path *path, u64 dir,
1021 u64 objectid, const char *name, int name_len,
1023 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1024 struct btrfs_path *path,
1025 const char *name, int name_len);
1026 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1027 struct btrfs_root *root,
1028 struct btrfs_path *path,
1029 struct btrfs_dir_item *di);
1030 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1031 struct btrfs_root *root, const char *name,
1032 u16 name_len, const void *data, u16 data_len,
1034 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1035 struct btrfs_root *root,
1036 struct btrfs_path *path, u64 dir,
1037 const char *name, u16 name_len,
1040 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1041 struct btrfs_root *fs_root,
1042 u64 dirid, u64 *objectid);
1043 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1046 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1047 struct btrfs_root *root,
1048 struct btrfs_path *path, u64 objectid);
1049 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1050 *root, struct btrfs_path *path,
1051 struct btrfs_key *location, int mod);
1054 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1055 struct btrfs_root *root,
1056 u64 objectid, u64 pos, u64 offset,
1059 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1060 struct btrfs_root *root,
1061 struct btrfs_path *path, u64 objectid,
1062 u64 bytenr, int mod);
1063 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1064 struct btrfs_root *root,
1065 struct inode *inode,
1066 u64 objectid, u64 offset,
1067 char *data, size_t len);
1068 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1069 struct btrfs_root *root,
1070 struct btrfs_path *path,
1071 u64 objectid, u64 offset,
1073 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1074 struct btrfs_root *root, struct btrfs_path *path,
1077 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1078 int btrfs_readpage(struct file *file, struct page *page);
1079 void btrfs_delete_inode(struct inode *inode);
1080 void btrfs_read_locked_inode(struct inode *inode);
1081 int btrfs_write_inode(struct inode *inode, int wait);
1082 void btrfs_dirty_inode(struct inode *inode);
1083 struct inode *btrfs_alloc_inode(struct super_block *sb);
1084 void btrfs_destroy_inode(struct inode *inode);
1085 int btrfs_init_cachep(void);
1086 void btrfs_destroy_cachep(void);
1087 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1088 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1089 struct btrfs_root *root);
1090 int btrfs_commit_write(struct file *file, struct page *page,
1091 unsigned from, unsigned to);
1092 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1093 size_t page_offset, u64 start, u64 end,
1095 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1096 struct btrfs_root *root,
1097 struct inode *inode);
1099 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1100 extern struct file_operations btrfs_file_operations;
1101 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1102 struct btrfs_root *root, struct inode *inode,
1103 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1105 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1106 struct btrfs_root *root, int cache_only);
1109 int btrfs_init_sysfs(void);
1110 void btrfs_exit_sysfs(void);
1111 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1112 int btrfs_sysfs_add_root(struct btrfs_root *root);
1113 void btrfs_sysfs_del_root(struct btrfs_root *root);
1114 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1117 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1118 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1119 struct btrfs_root *root, struct inode *inode);