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(ref_root, struct btrfs_extent_ref, root, 64);
548 BTRFS_SETGET_STACK_FUNCS(ref_generation, struct btrfs_extent_ref,
550 BTRFS_SETGET_STACK_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
551 BTRFS_SETGET_STACK_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
553 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
556 /* struct btrfs_node */
557 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
558 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
560 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
563 ptr = offsetof(struct btrfs_node, ptrs) +
564 sizeof(struct btrfs_key_ptr) * nr;
565 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
568 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
572 ptr = offsetof(struct btrfs_node, ptrs) +
573 sizeof(struct btrfs_key_ptr) * nr;
574 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
577 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
580 ptr = offsetof(struct btrfs_node, ptrs) +
581 sizeof(struct btrfs_key_ptr) * nr;
582 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
585 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
589 ptr = offsetof(struct btrfs_node, ptrs) +
590 sizeof(struct btrfs_key_ptr) * nr;
591 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
594 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
596 return offsetof(struct btrfs_node, ptrs) +
597 sizeof(struct btrfs_key_ptr) * nr;
600 void btrfs_node_key(struct extent_buffer *eb,
601 struct btrfs_disk_key *disk_key, int nr);
603 static inline void btrfs_set_node_key(struct extent_buffer *eb,
604 struct btrfs_disk_key *disk_key, int nr)
607 ptr = btrfs_node_key_ptr_offset(nr);
608 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
609 struct btrfs_key_ptr, key, disk_key);
612 /* struct btrfs_item */
613 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
614 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
616 static inline unsigned long btrfs_item_nr_offset(int nr)
618 return offsetof(struct btrfs_leaf, items) +
619 sizeof(struct btrfs_item) * nr;
622 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
625 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
628 static inline u32 btrfs_item_end(struct extent_buffer *eb,
629 struct btrfs_item *item)
631 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
634 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
636 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
639 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
641 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
644 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
646 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
649 static inline void btrfs_item_key(struct extent_buffer *eb,
650 struct btrfs_disk_key *disk_key, int nr)
652 struct btrfs_item *item = btrfs_item_nr(eb, nr);
653 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
656 static inline void btrfs_set_item_key(struct extent_buffer *eb,
657 struct btrfs_disk_key *disk_key, int nr)
659 struct btrfs_item *item = btrfs_item_nr(eb, nr);
660 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
663 /* struct btrfs_dir_item */
664 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
665 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
666 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
668 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
669 struct btrfs_dir_item *item,
670 struct btrfs_disk_key *key)
672 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
675 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
676 struct btrfs_dir_item *item,
677 struct btrfs_disk_key *key)
679 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
682 /* struct btrfs_disk_key */
683 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
685 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
686 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
688 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
689 struct btrfs_disk_key *disk)
691 cpu->offset = le64_to_cpu(disk->offset);
692 cpu->type = disk->type;
693 cpu->objectid = le64_to_cpu(disk->objectid);
696 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
697 struct btrfs_key *cpu)
699 disk->offset = cpu_to_le64(cpu->offset);
700 disk->type = cpu->type;
701 disk->objectid = cpu_to_le64(cpu->objectid);
704 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
705 struct btrfs_key *key, int nr)
707 struct btrfs_disk_key disk_key;
708 btrfs_node_key(eb, &disk_key, nr);
709 btrfs_disk_key_to_cpu(key, &disk_key);
712 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
713 struct btrfs_key *key, int nr)
715 struct btrfs_disk_key disk_key;
716 btrfs_item_key(eb, &disk_key, nr);
717 btrfs_disk_key_to_cpu(key, &disk_key);
720 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
721 struct btrfs_dir_item *item,
722 struct btrfs_key *key)
724 struct btrfs_disk_key disk_key;
725 btrfs_dir_item_key(eb, item, &disk_key);
726 btrfs_disk_key_to_cpu(key, &disk_key);
730 static inline u8 btrfs_key_type(struct btrfs_key *key)
735 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
740 /* struct btrfs_header */
741 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
742 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
744 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
745 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
746 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
747 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
749 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
751 unsigned long ptr = offsetof(struct btrfs_header, fsid);
755 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
757 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
761 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
763 unsigned long ptr = offsetof(struct btrfs_header, csum);
767 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
772 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
777 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
782 static inline int btrfs_is_leaf(struct extent_buffer *eb)
784 return (btrfs_header_level(eb) == 0);
787 /* struct btrfs_root_item */
788 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
789 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
790 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
792 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
793 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
794 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
795 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
796 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
797 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
798 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
800 /* struct btrfs_super_block */
801 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
802 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
804 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
805 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
807 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
809 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
811 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
813 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
815 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
817 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
819 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
820 root_dir_objectid, 64);
822 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
824 return offsetof(struct btrfs_leaf, items);
827 /* struct btrfs_file_extent_item */
828 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
830 static inline unsigned long btrfs_file_extent_inline_start(struct
831 btrfs_file_extent_item *e)
833 unsigned long offset = (unsigned long)e;
834 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
838 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
840 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
843 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
844 struct btrfs_item *e)
846 unsigned long offset;
847 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
848 return btrfs_item_size(eb, e) - offset;
851 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
853 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
855 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
857 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
859 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
862 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
864 return sb->s_fs_info;
867 static inline int btrfs_set_root_name(struct btrfs_root *root,
868 const char *name, int len)
870 /* if we already have a name just free it */
874 root->name = kmalloc(len+1, GFP_KERNEL);
878 memcpy(root->name, name, len);
879 root->name[len] ='\0';
884 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
886 return root->leafsize;
887 return root->nodesize;
890 /* helper function to cast into the data area of the leaf. */
891 #define btrfs_item_ptr(leaf, slot, type) \
892 ((type *)(btrfs_leaf_data(leaf) + \
893 btrfs_item_offset_nr(leaf, slot)))
895 #define btrfs_item_ptr_offset(leaf, slot) \
896 ((unsigned long)(btrfs_leaf_data(leaf) + \
897 btrfs_item_offset_nr(leaf, slot)))
899 /* mount option defines and helpers */
900 #define BTRFS_MOUNT_SUBVOL 0x000001
901 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
902 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
903 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
906 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
907 struct btrfs_root *root);
908 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
909 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
912 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
913 struct btrfs_block_group_cache
914 *hint, u64 search_start,
915 int data, int owner);
916 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
917 struct btrfs_root *root);
918 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
919 struct btrfs_root *root, u32 size,
920 u64 hint, u64 empty_size);
921 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
922 struct btrfs_root *root, u64 owner,
923 u64 num_bytes, u64 empty_size, u64 search_start,
924 u64 search_end, struct btrfs_key *ins, int data);
925 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
926 struct extent_buffer *buf);
927 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
928 *root, u64 bytenr, u64 num_bytes, int pin);
929 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
930 struct btrfs_root *root,
931 struct extent_map_tree *unpin);
932 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
933 struct btrfs_root *root,
934 u64 bytenr, u64 num_bytes);
935 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
936 struct btrfs_root *root);
937 int btrfs_free_block_groups(struct btrfs_fs_info *info);
938 int btrfs_read_block_groups(struct btrfs_root *root);
940 int btrfs_cow_block(struct btrfs_trans_handle *trans,
941 struct btrfs_root *root, struct extent_buffer *buf,
942 struct extent_buffer *parent, int parent_slot,
943 struct extent_buffer **cow_ret);
944 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
945 *root, struct btrfs_path *path, u32 data_size);
946 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
947 struct btrfs_root *root,
948 struct btrfs_path *path,
949 u32 new_size, int from_end);
950 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
951 *root, struct btrfs_key *key, struct btrfs_path *p, int
953 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
954 struct btrfs_root *root, struct extent_buffer *parent,
955 int start_slot, int cache_only, u64 *last_ret,
956 struct btrfs_key *progress);
957 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
958 struct btrfs_path *btrfs_alloc_path(void);
959 void btrfs_free_path(struct btrfs_path *p);
960 void btrfs_init_path(struct btrfs_path *p);
961 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
962 struct btrfs_path *path);
963 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
964 *root, struct btrfs_key *key, void *data, u32 data_size);
965 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
966 *root, struct btrfs_path *path, struct btrfs_key
967 *cpu_key, u32 data_size);
968 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
969 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
970 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
973 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
974 struct btrfs_key *key);
975 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
976 *root, struct btrfs_key *key, struct btrfs_root_item
978 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
979 *root, struct btrfs_key *key, struct btrfs_root_item
981 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
982 btrfs_root_item *item, struct btrfs_key *key);
983 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
984 struct btrfs_root *latest_root);
986 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
987 *root, const char *name, int name_len, u64 dir,
988 struct btrfs_key *location, u8 type);
989 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
990 struct btrfs_root *root,
991 struct btrfs_path *path, u64 dir,
992 const char *name, int name_len,
994 struct btrfs_dir_item *
995 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
996 struct btrfs_root *root,
997 struct btrfs_path *path, u64 dir,
998 u64 objectid, const char *name, int name_len,
1000 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1001 struct btrfs_path *path,
1002 const char *name, int name_len);
1003 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1004 struct btrfs_root *root,
1005 struct btrfs_path *path,
1006 struct btrfs_dir_item *di);
1007 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1008 struct btrfs_root *root, const char *name,
1009 u16 name_len, const void *data, u16 data_len,
1011 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1012 struct btrfs_root *root,
1013 struct btrfs_path *path, u64 dir,
1014 const char *name, u16 name_len,
1017 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1018 struct btrfs_root *fs_root,
1019 u64 dirid, u64 *objectid);
1020 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1023 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1024 struct btrfs_root *root,
1025 struct btrfs_path *path, u64 objectid);
1026 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1027 *root, struct btrfs_path *path,
1028 struct btrfs_key *location, int mod);
1031 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1032 struct btrfs_root *root,
1033 u64 objectid, u64 pos, u64 offset,
1036 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1037 struct btrfs_root *root,
1038 struct btrfs_path *path, u64 objectid,
1039 u64 bytenr, int mod);
1040 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1041 struct btrfs_root *root,
1042 struct inode *inode,
1043 u64 objectid, u64 offset,
1044 char *data, size_t len);
1045 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1046 struct btrfs_root *root,
1047 struct btrfs_path *path,
1048 u64 objectid, u64 offset,
1050 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1051 struct btrfs_root *root, struct btrfs_path *path,
1054 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1055 int btrfs_readpage(struct file *file, struct page *page);
1056 void btrfs_delete_inode(struct inode *inode);
1057 void btrfs_read_locked_inode(struct inode *inode);
1058 int btrfs_write_inode(struct inode *inode, int wait);
1059 void btrfs_dirty_inode(struct inode *inode);
1060 struct inode *btrfs_alloc_inode(struct super_block *sb);
1061 void btrfs_destroy_inode(struct inode *inode);
1062 int btrfs_init_cachep(void);
1063 void btrfs_destroy_cachep(void);
1064 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1065 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1066 struct btrfs_root *root);
1067 int btrfs_commit_write(struct file *file, struct page *page,
1068 unsigned from, unsigned to);
1069 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1070 size_t page_offset, u64 start, u64 end,
1072 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1073 struct btrfs_root *root,
1074 struct inode *inode);
1076 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1077 extern struct file_operations btrfs_file_operations;
1078 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1079 struct btrfs_root *root, struct inode *inode,
1080 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1082 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1083 struct btrfs_root *root, int cache_only);
1086 int btrfs_init_sysfs(void);
1087 void btrfs_exit_sysfs(void);
1088 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1089 int btrfs_sysfs_add_root(struct btrfs_root *root);
1090 void btrfs_sysfs_del_root(struct btrfs_root *root);
1091 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1094 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1095 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1096 struct btrfs_root *root, struct inode *inode);