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_MAX_LEVEL 8
41 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
42 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
43 #define BTRFS_FS_TREE_OBJECTID 3ULL
44 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
45 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
48 * we can actually store much bigger names, but lets not confuse the rest
51 #define BTRFS_NAME_LEN 255
53 /* 32 bytes in various csum fields */
54 #define BTRFS_CSUM_SIZE 32
55 /* four bytes for CRC32 */
56 #define BTRFS_CRC32_SIZE 4
57 #define BTRFS_EMPTY_DIR_SIZE 0
59 #define BTRFS_FT_UNKNOWN 0
60 #define BTRFS_FT_REG_FILE 1
61 #define BTRFS_FT_DIR 2
62 #define BTRFS_FT_CHRDEV 3
63 #define BTRFS_FT_BLKDEV 4
64 #define BTRFS_FT_FIFO 5
65 #define BTRFS_FT_SOCK 6
66 #define BTRFS_FT_SYMLINK 7
67 #define BTRFS_FT_XATTR 8
68 #define BTRFS_FT_MAX 9
71 * the key defines the order in the tree, and so it also defines (optimal)
72 * block layout. objectid corresonds to the inode number. The flags
73 * tells us things about the object, and is a kind of stream selector.
74 * so for a given inode, keys with flags of 1 might refer to the inode
75 * data, flags of 2 may point to file data in the btree and flags == 3
76 * may point to extents.
78 * offset is the starting byte offset for this key in the stream.
80 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
81 * in cpu native order. Otherwise they are identical and their sizes
82 * should be the same (ie both packed)
84 struct btrfs_disk_key {
88 } __attribute__ ((__packed__));
94 } __attribute__ ((__packed__));
96 #define BTRFS_FSID_SIZE 16
98 * every tree block (leaf or node) starts with this header.
100 struct btrfs_header {
101 u8 csum[BTRFS_CSUM_SIZE];
102 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
103 __le64 bytenr; /* which block this node is supposed to live in */
109 } __attribute__ ((__packed__));
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_ref {
212 } __attribute__ ((__packed__));
214 struct btrfs_inode_timespec {
217 } __attribute__ ((__packed__));
220 * there is no padding here on purpose. If you want to extent the inode,
221 * make a new item type
223 struct btrfs_inode_item {
235 struct btrfs_inode_timespec atime;
236 struct btrfs_inode_timespec ctime;
237 struct btrfs_inode_timespec mtime;
238 struct btrfs_inode_timespec otime;
239 } __attribute__ ((__packed__));
241 struct btrfs_dir_item {
242 struct btrfs_disk_key location;
246 } __attribute__ ((__packed__));
248 struct btrfs_root_item {
249 struct btrfs_inode_item inode;
256 struct btrfs_disk_key drop_progress;
259 } __attribute__ ((__packed__));
261 #define BTRFS_FILE_EXTENT_REG 0
262 #define BTRFS_FILE_EXTENT_INLINE 1
264 struct btrfs_file_extent_item {
268 * disk space consumed by the extent, checksum blocks are included
272 __le64 disk_num_bytes;
274 * the logical offset in file blocks (no csums)
275 * this extent record is for. This allows a file extent to point
276 * into the middle of an existing extent on disk, sharing it
277 * between two snapshots (useful if some bytes in the middle of the
278 * extent have changed
282 * the logical number of file blocks (no csums included)
285 } __attribute__ ((__packed__));
287 struct btrfs_csum_item {
289 } __attribute__ ((__packed__));
291 /* tag for the radix tree of block groups in ram */
292 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
295 #define BTRFS_BLOCK_GROUP_DATA 1
296 #define BTRFS_BLOCK_GROUP_MIXED 2
298 struct btrfs_block_group_item {
301 } __attribute__ ((__packed__));
303 struct btrfs_block_group_cache {
304 struct btrfs_key key;
305 struct btrfs_block_group_item item;
310 struct btrfs_fs_info {
311 u8 fsid[BTRFS_FSID_SIZE];
312 struct btrfs_root *extent_root;
313 struct btrfs_root *tree_root;
314 struct radix_tree_root fs_roots_radix;
316 struct extent_map_tree free_space_cache;
317 struct extent_map_tree block_group_cache;
318 struct extent_map_tree pinned_extents;
319 struct extent_map_tree pending_del;
320 struct extent_map_tree extent_ins;
323 u64 last_trans_committed;
324 unsigned long mount_opt;
325 struct btrfs_transaction *running_transaction;
326 struct btrfs_super_block super_copy;
327 struct extent_buffer *sb_buffer;
328 struct super_block *sb;
329 struct inode *btree_inode;
330 spinlock_t hash_lock;
331 struct mutex trans_mutex;
332 struct mutex fs_mutex;
333 struct list_head trans_list;
334 struct list_head hashers;
335 struct list_head dead_roots;
336 struct delayed_work trans_work;
337 struct kobject super_kobj;
338 struct completion kobj_unregister;
345 * in ram representation of the tree. extent_root is used for all allocations
346 * and for the extent tree extent_root root.
349 struct extent_buffer *node;
350 struct extent_buffer *commit_root;
351 struct btrfs_root_item root_item;
352 struct btrfs_key root_key;
353 struct btrfs_fs_info *fs_info;
355 struct kobject root_kobj;
356 struct completion kobj_unregister;
357 struct rw_semaphore snap_sem;
361 /* data allocations are done in sectorsize units */
364 /* node allocations are done in nodesize units */
367 /* leaf allocations are done in leafsize units */
374 u64 last_inode_alloc;
376 struct btrfs_key defrag_progress;
383 * inode items have the data typically returned from stat and store other
384 * info about object characteristics. There is one for every file and dir in
387 #define BTRFS_INODE_ITEM_KEY 1
388 #define BTRFS_INODE_REF_KEY 2
389 #define BTRFS_XATTR_ITEM_KEY 8
390 /* reserve 2-15 close to the inode for later flexibility */
393 * dir items are the name -> inode pointers in a directory. There is one
394 * for every name in a directory.
396 #define BTRFS_DIR_ITEM_KEY 16
397 #define BTRFS_DIR_INDEX_KEY 17
399 * extent data is for file data
401 #define BTRFS_EXTENT_DATA_KEY 18
403 * csum items have the checksums for data in the extents
405 #define BTRFS_CSUM_ITEM_KEY 19
407 /* reserve 20-31 for other file stuff */
410 * root items point to tree roots. There are typically in the root
411 * tree used by the super block to find all the other trees
413 #define BTRFS_ROOT_ITEM_KEY 32
415 * extent items are in the extent map tree. These record which blocks
416 * are used, and how many references there are to each block
418 #define BTRFS_EXTENT_ITEM_KEY 33
419 #define BTRFS_EXTENT_REF_KEY 34
422 * block groups give us hints into the extent allocation trees. Which
423 * blocks are free etc etc
425 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
428 * string items are for debugging. They just store a short string of
431 #define BTRFS_STRING_ITEM_KEY 253
433 #define BTRFS_MOUNT_NODATASUM 0x1
434 #define BTRFS_MOUNT_NODATACOW 0x2
436 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
437 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
438 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
441 /* some macros to generate set/get funcs for the struct fields. This
442 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
445 #define le8_to_cpu(v) (v)
446 #define cpu_to_le8(v) (v)
449 #define read_eb_member(eb, ptr, type, member, result) ( \
450 read_extent_buffer(eb, (char *)(result), \
451 ((unsigned long)(ptr)) + \
452 offsetof(type, member), \
453 sizeof(((type *)0)->member)))
455 #define write_eb_member(eb, ptr, type, member, result) ( \
456 write_extent_buffer(eb, (char *)(result), \
457 ((unsigned long)(ptr)) + \
458 offsetof(type, member), \
459 sizeof(((type *)0)->member)))
461 #ifndef BTRFS_SETGET_FUNCS
462 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
463 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
464 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
467 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
468 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
470 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
471 unsigned long offset = offsetof(type, member); \
473 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
474 res = le##bits##_to_cpu(*tmp); \
475 kunmap_atomic(kaddr, KM_USER0); \
478 static inline void btrfs_set_##name(struct extent_buffer *eb, \
481 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
482 unsigned long offset = offsetof(type, member); \
483 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
484 *tmp = cpu_to_le##bits(val); \
485 kunmap_atomic(kaddr, KM_USER0); \
488 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
489 static inline u##bits btrfs_##name(type *s) \
491 return le##bits##_to_cpu(s->member); \
493 static inline void btrfs_set_##name(type *s, u##bits val) \
495 s->member = cpu_to_le##bits(val); \
498 /* struct btrfs_block_group_item */
499 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
501 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
504 /* struct btrfs_inode_ref */
505 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
507 /* struct btrfs_inode_item */
508 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
509 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
510 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
511 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
512 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
513 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
514 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
515 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
516 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
517 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
518 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
521 static inline struct btrfs_inode_timespec *
522 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
524 unsigned long ptr = (unsigned long)inode_item;
525 ptr += offsetof(struct btrfs_inode_item, atime);
526 return (struct btrfs_inode_timespec *)ptr;
529 static inline struct btrfs_inode_timespec *
530 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
532 unsigned long ptr = (unsigned long)inode_item;
533 ptr += offsetof(struct btrfs_inode_item, mtime);
534 return (struct btrfs_inode_timespec *)ptr;
537 static inline struct btrfs_inode_timespec *
538 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
540 unsigned long ptr = (unsigned long)inode_item;
541 ptr += offsetof(struct btrfs_inode_item, ctime);
542 return (struct btrfs_inode_timespec *)ptr;
545 static inline struct btrfs_inode_timespec *
546 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
548 unsigned long ptr = (unsigned long)inode_item;
549 ptr += offsetof(struct btrfs_inode_item, otime);
550 return (struct btrfs_inode_timespec *)ptr;
553 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
554 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
556 /* struct btrfs_extent_item */
557 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
559 /* struct btrfs_extent_ref */
560 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
561 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
562 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
563 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
565 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
566 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
568 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
570 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
572 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
575 /* struct btrfs_node */
576 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
577 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
579 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
582 ptr = offsetof(struct btrfs_node, ptrs) +
583 sizeof(struct btrfs_key_ptr) * nr;
584 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
587 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
591 ptr = offsetof(struct btrfs_node, ptrs) +
592 sizeof(struct btrfs_key_ptr) * nr;
593 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
596 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
599 ptr = offsetof(struct btrfs_node, ptrs) +
600 sizeof(struct btrfs_key_ptr) * nr;
601 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
604 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
608 ptr = offsetof(struct btrfs_node, ptrs) +
609 sizeof(struct btrfs_key_ptr) * nr;
610 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
613 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
615 return offsetof(struct btrfs_node, ptrs) +
616 sizeof(struct btrfs_key_ptr) * nr;
619 void btrfs_node_key(struct extent_buffer *eb,
620 struct btrfs_disk_key *disk_key, int nr);
622 static inline void btrfs_set_node_key(struct extent_buffer *eb,
623 struct btrfs_disk_key *disk_key, int nr)
626 ptr = btrfs_node_key_ptr_offset(nr);
627 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
628 struct btrfs_key_ptr, key, disk_key);
631 /* struct btrfs_item */
632 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
633 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
635 static inline unsigned long btrfs_item_nr_offset(int nr)
637 return offsetof(struct btrfs_leaf, items) +
638 sizeof(struct btrfs_item) * nr;
641 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
644 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
647 static inline u32 btrfs_item_end(struct extent_buffer *eb,
648 struct btrfs_item *item)
650 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
653 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
655 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
658 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
660 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
663 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
665 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
668 static inline void btrfs_item_key(struct extent_buffer *eb,
669 struct btrfs_disk_key *disk_key, int nr)
671 struct btrfs_item *item = btrfs_item_nr(eb, nr);
672 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
675 static inline void btrfs_set_item_key(struct extent_buffer *eb,
676 struct btrfs_disk_key *disk_key, int nr)
678 struct btrfs_item *item = btrfs_item_nr(eb, nr);
679 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
682 /* struct btrfs_dir_item */
683 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
684 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
685 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
687 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
688 struct btrfs_dir_item *item,
689 struct btrfs_disk_key *key)
691 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
694 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
695 struct btrfs_dir_item *item,
696 struct btrfs_disk_key *key)
698 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
701 /* struct btrfs_disk_key */
702 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
704 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
705 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
707 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
708 struct btrfs_disk_key *disk)
710 cpu->offset = le64_to_cpu(disk->offset);
711 cpu->type = disk->type;
712 cpu->objectid = le64_to_cpu(disk->objectid);
715 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
716 struct btrfs_key *cpu)
718 disk->offset = cpu_to_le64(cpu->offset);
719 disk->type = cpu->type;
720 disk->objectid = cpu_to_le64(cpu->objectid);
723 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
724 struct btrfs_key *key, int nr)
726 struct btrfs_disk_key disk_key;
727 btrfs_node_key(eb, &disk_key, nr);
728 btrfs_disk_key_to_cpu(key, &disk_key);
731 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
732 struct btrfs_key *key, int nr)
734 struct btrfs_disk_key disk_key;
735 btrfs_item_key(eb, &disk_key, nr);
736 btrfs_disk_key_to_cpu(key, &disk_key);
739 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
740 struct btrfs_dir_item *item,
741 struct btrfs_key *key)
743 struct btrfs_disk_key disk_key;
744 btrfs_dir_item_key(eb, item, &disk_key);
745 btrfs_disk_key_to_cpu(key, &disk_key);
749 static inline u8 btrfs_key_type(struct btrfs_key *key)
754 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
759 /* struct btrfs_header */
760 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
761 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
763 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
764 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
765 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
766 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
768 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
770 unsigned long ptr = offsetof(struct btrfs_header, fsid);
774 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
776 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
780 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
782 unsigned long ptr = offsetof(struct btrfs_header, csum);
786 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
791 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
796 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
801 static inline int btrfs_is_leaf(struct extent_buffer *eb)
803 return (btrfs_header_level(eb) == 0);
806 /* struct btrfs_root_item */
807 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
808 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
809 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
811 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
812 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
813 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
814 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
815 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
816 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
817 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
819 /* struct btrfs_super_block */
820 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
821 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
823 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
824 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
826 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
828 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
830 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
832 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
834 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
836 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
838 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
839 root_dir_objectid, 64);
841 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
843 return offsetof(struct btrfs_leaf, items);
846 /* struct btrfs_file_extent_item */
847 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
849 static inline unsigned long btrfs_file_extent_inline_start(struct
850 btrfs_file_extent_item *e)
852 unsigned long offset = (unsigned long)e;
853 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
857 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
859 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
862 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
863 struct btrfs_item *e)
865 unsigned long offset;
866 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
867 return btrfs_item_size(eb, e) - offset;
870 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
872 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
874 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
876 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
878 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
881 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
883 return sb->s_fs_info;
886 static inline int btrfs_set_root_name(struct btrfs_root *root,
887 const char *name, int len)
889 /* if we already have a name just free it */
893 root->name = kmalloc(len+1, GFP_KERNEL);
897 memcpy(root->name, name, len);
898 root->name[len] ='\0';
903 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
905 return root->leafsize;
906 return root->nodesize;
909 /* helper function to cast into the data area of the leaf. */
910 #define btrfs_item_ptr(leaf, slot, type) \
911 ((type *)(btrfs_leaf_data(leaf) + \
912 btrfs_item_offset_nr(leaf, slot)))
914 #define btrfs_item_ptr_offset(leaf, slot) \
915 ((unsigned long)(btrfs_leaf_data(leaf) + \
916 btrfs_item_offset_nr(leaf, slot)))
919 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
920 struct btrfs_path *count_path,
922 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
923 struct btrfs_root *root);
924 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
925 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
928 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
929 struct btrfs_block_group_cache
930 *hint, u64 search_start,
931 int data, int owner);
932 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
933 struct btrfs_root *root, u64 owner_objectid);
934 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
935 struct btrfs_root *root, u32 size,
937 u64 hint, u64 empty_size);
938 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
939 struct btrfs_root *root,
947 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
948 struct btrfs_root *root,
949 struct btrfs_path *path, u64 bytenr,
950 u64 root_objectid, u64 ref_generation,
951 u64 owner, u64 owner_offset);
952 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
953 struct btrfs_root *root,
954 u64 num_bytes, u64 root_objectid, u64 ref_generation,
955 u64 owner, u64 owner_offset,
956 u64 empty_size, u64 hint_byte,
957 u64 search_end, struct btrfs_key *ins, int data);
958 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
959 struct extent_buffer *buf);
960 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
961 *root, u64 bytenr, u64 num_bytes,
962 u64 root_objectid, u64 ref_generation,
963 u64 owner_objectid, u64 owner_offset, int pin);
964 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
965 struct btrfs_root *root,
966 struct extent_map_tree *unpin);
967 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
968 struct btrfs_root *root,
969 u64 bytenr, u64 num_bytes,
970 u64 root_objectid, u64 ref_generation,
971 u64 owner, u64 owner_offset);
972 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
973 struct btrfs_root *root);
974 int btrfs_free_block_groups(struct btrfs_fs_info *info);
975 int btrfs_read_block_groups(struct btrfs_root *root);
977 int btrfs_cow_block(struct btrfs_trans_handle *trans,
978 struct btrfs_root *root, struct extent_buffer *buf,
979 struct extent_buffer *parent, int parent_slot,
980 struct extent_buffer **cow_ret);
981 int btrfs_copy_root(struct btrfs_trans_handle *trans,
982 struct btrfs_root *root,
983 struct extent_buffer *buf,
984 struct extent_buffer **cow_ret, u64 new_root_objectid);
985 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
986 *root, struct btrfs_path *path, u32 data_size);
987 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
988 struct btrfs_root *root,
989 struct btrfs_path *path,
990 u32 new_size, int from_end);
991 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
992 *root, struct btrfs_key *key, struct btrfs_path *p, int
994 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
995 struct btrfs_root *root, struct extent_buffer *parent,
996 int start_slot, int cache_only, u64 *last_ret,
997 struct btrfs_key *progress);
998 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
999 struct btrfs_path *btrfs_alloc_path(void);
1000 void btrfs_free_path(struct btrfs_path *p);
1001 void btrfs_init_path(struct btrfs_path *p);
1002 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1003 struct btrfs_path *path);
1004 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1005 *root, struct btrfs_key *key, void *data, u32 data_size);
1006 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1007 *root, struct btrfs_path *path, struct btrfs_key
1008 *cpu_key, u32 data_size);
1009 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1010 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1011 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1012 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1015 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1016 struct btrfs_key *key);
1017 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1018 *root, struct btrfs_key *key, struct btrfs_root_item
1020 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1021 *root, struct btrfs_key *key, struct btrfs_root_item
1023 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1024 btrfs_root_item *item, struct btrfs_key *key);
1025 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1026 struct btrfs_root *latest_root);
1028 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1029 *root, const char *name, int name_len, u64 dir,
1030 struct btrfs_key *location, u8 type);
1031 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1032 struct btrfs_root *root,
1033 struct btrfs_path *path, u64 dir,
1034 const char *name, int name_len,
1036 struct btrfs_dir_item *
1037 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1038 struct btrfs_root *root,
1039 struct btrfs_path *path, u64 dir,
1040 u64 objectid, const char *name, int name_len,
1042 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1043 struct btrfs_path *path,
1044 const char *name, int name_len);
1045 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1046 struct btrfs_root *root,
1047 struct btrfs_path *path,
1048 struct btrfs_dir_item *di);
1049 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1050 struct btrfs_root *root, const char *name,
1051 u16 name_len, const void *data, u16 data_len,
1053 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1054 struct btrfs_root *root,
1055 struct btrfs_path *path, u64 dir,
1056 const char *name, u16 name_len,
1059 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1060 struct btrfs_root *fs_root,
1061 u64 dirid, u64 *objectid);
1062 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1065 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1066 struct btrfs_root *root,
1067 const char *name, int name_len,
1068 u64 inode_objectid, u64 ref_objectid);
1069 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1070 struct btrfs_root *root,
1071 const char *name, int name_len,
1072 u64 inode_objectid, u64 ref_objectid);
1073 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1074 struct btrfs_root *root,
1075 struct btrfs_path *path, u64 objectid);
1076 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1077 *root, struct btrfs_path *path,
1078 struct btrfs_key *location, int mod);
1081 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1082 struct btrfs_root *root,
1083 u64 objectid, u64 pos, u64 offset,
1086 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1087 struct btrfs_root *root,
1088 struct btrfs_path *path, u64 objectid,
1089 u64 bytenr, int mod);
1090 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1091 struct btrfs_root *root,
1092 struct inode *inode,
1093 u64 objectid, u64 offset,
1094 char *data, size_t len);
1095 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1096 struct btrfs_root *root,
1097 struct btrfs_path *path,
1098 u64 objectid, u64 offset,
1100 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1101 struct btrfs_root *root, struct btrfs_path *path,
1104 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1105 int btrfs_readpage(struct file *file, struct page *page);
1106 void btrfs_delete_inode(struct inode *inode);
1107 void btrfs_read_locked_inode(struct inode *inode);
1108 int btrfs_write_inode(struct inode *inode, int wait);
1109 void btrfs_dirty_inode(struct inode *inode);
1110 struct inode *btrfs_alloc_inode(struct super_block *sb);
1111 void btrfs_destroy_inode(struct inode *inode);
1112 int btrfs_init_cachep(void);
1113 void btrfs_destroy_cachep(void);
1114 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1115 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1116 struct btrfs_root *root);
1117 int btrfs_commit_write(struct file *file, struct page *page,
1118 unsigned from, unsigned to);
1119 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1120 size_t page_offset, u64 start, u64 end,
1122 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1123 struct btrfs_root *root,
1124 struct inode *inode);
1126 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1127 extern struct file_operations btrfs_file_operations;
1128 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1129 struct btrfs_root *root, struct inode *inode,
1130 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1132 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1133 struct btrfs_root *root, int cache_only);
1136 int btrfs_init_sysfs(void);
1137 void btrfs_exit_sysfs(void);
1138 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1139 int btrfs_sysfs_add_root(struct btrfs_root *root);
1140 void btrfs_sysfs_del_root(struct btrfs_root *root);
1141 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1144 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1145 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1146 struct btrfs_root *root, struct inode *inode);