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.
19 #ifndef __BTRFS_CTREE__
20 #define __BTRFS_CTREE__
22 #include <linux/version.h>
24 #include <linux/highmem.h>
26 #include <linux/workqueue.h>
27 #include <linux/completion.h>
28 #include <asm/kmap_types.h>
29 #include "bit-radix.h"
30 #include "extent_map.h"
32 struct btrfs_trans_handle;
33 struct btrfs_transaction;
34 extern struct kmem_cache *btrfs_trans_handle_cachep;
35 extern struct kmem_cache *btrfs_transaction_cachep;
36 extern struct kmem_cache *btrfs_bit_radix_cachep;
37 extern struct kmem_cache *btrfs_path_cachep;
39 #define BTRFS_MAGIC "_B3RfS_M"
41 #define BTRFS_MAX_LEVEL 8
42 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
43 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
44 #define BTRFS_FS_TREE_OBJECTID 3ULL
45 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
46 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
49 * we can actually store much bigger names, but lets not confuse the rest
52 #define BTRFS_NAME_LEN 255
54 /* 32 bytes in various csum fields */
55 #define BTRFS_CSUM_SIZE 32
56 /* four bytes for CRC32 */
57 #define BTRFS_CRC32_SIZE 4
58 #define BTRFS_EMPTY_DIR_SIZE 0
60 #define BTRFS_FT_UNKNOWN 0
61 #define BTRFS_FT_REG_FILE 1
62 #define BTRFS_FT_DIR 2
63 #define BTRFS_FT_CHRDEV 3
64 #define BTRFS_FT_BLKDEV 4
65 #define BTRFS_FT_FIFO 5
66 #define BTRFS_FT_SOCK 6
67 #define BTRFS_FT_SYMLINK 7
68 #define BTRFS_FT_XATTR 8
69 #define BTRFS_FT_MAX 9
72 * the key defines the order in the tree, and so it also defines (optimal)
73 * block layout. objectid corresonds to the inode number. The flags
74 * tells us things about the object, and is a kind of stream selector.
75 * so for a given inode, keys with flags of 1 might refer to the inode
76 * data, flags of 2 may point to file data in the btree and flags == 3
77 * may point to extents.
79 * offset is the starting byte offset for this key in the stream.
81 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
82 * in cpu native order. Otherwise they are identical and their sizes
83 * should be the same (ie both packed)
85 struct btrfs_disk_key {
89 } __attribute__ ((__packed__));
95 } __attribute__ ((__packed__));
97 #define BTRFS_FSID_SIZE 16
99 * every tree block (leaf or node) starts with this header.
101 struct btrfs_header {
102 u8 csum[BTRFS_CSUM_SIZE];
103 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
104 __le64 bytenr; /* which block this node is supposed to live in */
110 } __attribute__ ((__packed__));
112 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
113 sizeof(struct btrfs_header)) / \
114 sizeof(struct btrfs_key_ptr))
115 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
116 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
117 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
118 sizeof(struct btrfs_item) - \
119 sizeof(struct btrfs_file_extent_item))
122 * the super block basically lists the main trees of the FS
123 * it currently lacks any block count etc etc
125 struct btrfs_super_block {
126 u8 csum[BTRFS_CSUM_SIZE];
127 /* the first 3 fields must match struct btrfs_header */
128 u8 fsid[16]; /* FS specific uuid */
129 __le64 bytenr; /* this block number */
135 __le64 root_dir_objectid;
141 } __attribute__ ((__packed__));
144 * A leaf is full of items. offset and size tell us where to find
145 * the item in the leaf (relative to the start of the data area)
148 struct btrfs_disk_key key;
151 } __attribute__ ((__packed__));
154 * leaves have an item area and a data area:
155 * [item0, item1....itemN] [free space] [dataN...data1, data0]
157 * The data is separate from the items to get the keys closer together
161 struct btrfs_header header;
162 struct btrfs_item items[];
163 } __attribute__ ((__packed__));
166 * all non-leaf blocks are nodes, they hold only keys and pointers to
169 struct btrfs_key_ptr {
170 struct btrfs_disk_key key;
173 } __attribute__ ((__packed__));
176 struct btrfs_header header;
177 struct btrfs_key_ptr ptrs[];
178 } __attribute__ ((__packed__));
181 * btrfs_paths remember the path taken from the root down to the leaf.
182 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
183 * to any other levels that are present.
185 * The slots array records the index of the item or block pointer
186 * used while walking the tree.
189 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
190 int slots[BTRFS_MAX_LEVEL];
196 * items in the extent btree are used to record the objectid of the
197 * owner of the block and the number of references
199 struct btrfs_extent_item {
201 } __attribute__ ((__packed__));
203 struct btrfs_extent_ref {
208 } __attribute__ ((__packed__));
210 struct btrfs_inode_ref {
213 } __attribute__ ((__packed__));
215 struct btrfs_inode_timespec {
218 } __attribute__ ((__packed__));
221 * there is no padding here on purpose. If you want to extent the inode,
222 * make a new item type
224 struct btrfs_inode_item {
236 struct btrfs_inode_timespec atime;
237 struct btrfs_inode_timespec ctime;
238 struct btrfs_inode_timespec mtime;
239 struct btrfs_inode_timespec otime;
240 } __attribute__ ((__packed__));
242 struct btrfs_dir_item {
243 struct btrfs_disk_key location;
247 } __attribute__ ((__packed__));
249 struct btrfs_root_item {
250 struct btrfs_inode_item inode;
257 struct btrfs_disk_key drop_progress;
260 } __attribute__ ((__packed__));
262 #define BTRFS_FILE_EXTENT_REG 0
263 #define BTRFS_FILE_EXTENT_INLINE 1
265 struct btrfs_file_extent_item {
269 * disk space consumed by the extent, checksum blocks are included
273 __le64 disk_num_bytes;
275 * the logical offset in file blocks (no csums)
276 * this extent record is for. This allows a file extent to point
277 * into the middle of an existing extent on disk, sharing it
278 * between two snapshots (useful if some bytes in the middle of the
279 * extent have changed
283 * the logical number of file blocks (no csums included)
286 } __attribute__ ((__packed__));
288 struct btrfs_csum_item {
290 } __attribute__ ((__packed__));
292 /* tag for the radix tree of block groups in ram */
293 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
296 #define BTRFS_BLOCK_GROUP_DATA 1
297 #define BTRFS_BLOCK_GROUP_MIXED 2
299 struct btrfs_block_group_item {
302 } __attribute__ ((__packed__));
304 struct btrfs_block_group_cache {
305 struct btrfs_key key;
306 struct btrfs_block_group_item item;
311 struct btrfs_fs_info {
312 u8 fsid[BTRFS_FSID_SIZE];
313 struct btrfs_root *extent_root;
314 struct btrfs_root *tree_root;
315 struct radix_tree_root fs_roots_radix;
317 struct extent_map_tree free_space_cache;
318 struct extent_map_tree block_group_cache;
319 struct extent_map_tree pinned_extents;
320 struct extent_map_tree pending_del;
321 struct extent_map_tree extent_ins;
324 u64 last_trans_committed;
325 unsigned long mount_opt;
328 struct btrfs_transaction *running_transaction;
329 struct btrfs_super_block super_copy;
330 struct extent_buffer *sb_buffer;
331 struct super_block *sb;
332 struct inode *btree_inode;
333 spinlock_t hash_lock;
334 struct mutex trans_mutex;
335 struct mutex fs_mutex;
336 struct list_head trans_list;
337 struct list_head hashers;
338 struct list_head dead_roots;
339 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
340 struct work_struct trans_work;
342 struct delayed_work trans_work;
344 struct kobject super_kobj;
345 struct completion kobj_unregister;
348 unsigned long throttles;
351 spinlock_t delalloc_lock;
352 spinlock_t new_trans_lock;
357 * in ram representation of the tree. extent_root is used for all allocations
358 * and for the extent tree extent_root root.
361 struct extent_buffer *node;
362 struct extent_buffer *commit_root;
363 struct btrfs_root_item root_item;
364 struct btrfs_key root_key;
365 struct btrfs_fs_info *fs_info;
367 struct kobject root_kobj;
368 struct completion kobj_unregister;
372 /* data allocations are done in sectorsize units */
375 /* node allocations are done in nodesize units */
378 /* leaf allocations are done in leafsize units */
385 u64 last_inode_alloc;
387 struct btrfs_key defrag_progress;
395 * inode items have the data typically returned from stat and store other
396 * info about object characteristics. There is one for every file and dir in
399 #define BTRFS_INODE_ITEM_KEY 1
400 #define BTRFS_INODE_REF_KEY 2
401 #define BTRFS_XATTR_ITEM_KEY 8
402 /* reserve 2-15 close to the inode for later flexibility */
405 * dir items are the name -> inode pointers in a directory. There is one
406 * for every name in a directory.
408 #define BTRFS_DIR_ITEM_KEY 16
409 #define BTRFS_DIR_INDEX_KEY 17
411 * extent data is for file data
413 #define BTRFS_EXTENT_DATA_KEY 18
415 * csum items have the checksums for data in the extents
417 #define BTRFS_CSUM_ITEM_KEY 19
419 /* reserve 20-31 for other file stuff */
422 * root items point to tree roots. There are typically in the root
423 * tree used by the super block to find all the other trees
425 #define BTRFS_ROOT_ITEM_KEY 32
427 * extent items are in the extent map tree. These record which blocks
428 * are used, and how many references there are to each block
430 #define BTRFS_EXTENT_ITEM_KEY 33
431 #define BTRFS_EXTENT_REF_KEY 34
434 * block groups give us hints into the extent allocation trees. Which
435 * blocks are free etc etc
437 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
440 * string items are for debugging. They just store a short string of
443 #define BTRFS_STRING_ITEM_KEY 253
445 #define BTRFS_MOUNT_NODATASUM (1 << 0)
446 #define BTRFS_MOUNT_NODATACOW (1 << 1)
447 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
448 #define BTRFS_MOUNT_SSD (1 << 3)
450 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
451 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
452 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
457 #define BTRFS_INODE_NODATASUM (1 << 0)
458 #define BTRFS_INODE_NODATACOW (1 << 1)
459 #define BTRFS_INODE_READONLY (1 << 2)
460 #define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
462 #define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
464 #define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \
466 /* some macros to generate set/get funcs for the struct fields. This
467 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
470 #define le8_to_cpu(v) (v)
471 #define cpu_to_le8(v) (v)
474 #define read_eb_member(eb, ptr, type, member, result) ( \
475 read_extent_buffer(eb, (char *)(result), \
476 ((unsigned long)(ptr)) + \
477 offsetof(type, member), \
478 sizeof(((type *)0)->member)))
480 #define write_eb_member(eb, ptr, type, member, result) ( \
481 write_extent_buffer(eb, (char *)(result), \
482 ((unsigned long)(ptr)) + \
483 offsetof(type, member), \
484 sizeof(((type *)0)->member)))
486 #ifndef BTRFS_SETGET_FUNCS
487 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
488 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
489 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
492 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
493 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
495 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
496 unsigned long offset = offsetof(type, member); \
498 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
499 res = le##bits##_to_cpu(*tmp); \
500 kunmap_atomic(kaddr, KM_USER0); \
503 static inline void btrfs_set_##name(struct extent_buffer *eb, \
506 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
507 unsigned long offset = offsetof(type, member); \
508 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
509 *tmp = cpu_to_le##bits(val); \
510 kunmap_atomic(kaddr, KM_USER0); \
513 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
514 static inline u##bits btrfs_##name(type *s) \
516 return le##bits##_to_cpu(s->member); \
518 static inline void btrfs_set_##name(type *s, u##bits val) \
520 s->member = cpu_to_le##bits(val); \
523 /* struct btrfs_block_group_item */
524 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
526 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
528 BTRFS_SETGET_FUNCS(disk_block_group_flags, struct btrfs_block_group_item,
531 /* struct btrfs_inode_ref */
532 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
534 /* struct btrfs_inode_item */
535 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
536 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
537 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
538 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
539 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
540 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
541 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
542 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
543 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
544 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
545 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
548 static inline struct btrfs_inode_timespec *
549 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
551 unsigned long ptr = (unsigned long)inode_item;
552 ptr += offsetof(struct btrfs_inode_item, atime);
553 return (struct btrfs_inode_timespec *)ptr;
556 static inline struct btrfs_inode_timespec *
557 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
559 unsigned long ptr = (unsigned long)inode_item;
560 ptr += offsetof(struct btrfs_inode_item, mtime);
561 return (struct btrfs_inode_timespec *)ptr;
564 static inline struct btrfs_inode_timespec *
565 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
567 unsigned long ptr = (unsigned long)inode_item;
568 ptr += offsetof(struct btrfs_inode_item, ctime);
569 return (struct btrfs_inode_timespec *)ptr;
572 static inline struct btrfs_inode_timespec *
573 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
575 unsigned long ptr = (unsigned long)inode_item;
576 ptr += offsetof(struct btrfs_inode_item, otime);
577 return (struct btrfs_inode_timespec *)ptr;
580 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
581 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
583 /* struct btrfs_extent_item */
584 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
586 /* struct btrfs_extent_ref */
587 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
588 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
589 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
590 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
592 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
593 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
595 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
597 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
599 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
602 /* struct btrfs_node */
603 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
604 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
606 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
609 ptr = offsetof(struct btrfs_node, ptrs) +
610 sizeof(struct btrfs_key_ptr) * nr;
611 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
614 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
618 ptr = offsetof(struct btrfs_node, ptrs) +
619 sizeof(struct btrfs_key_ptr) * nr;
620 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
623 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
626 ptr = offsetof(struct btrfs_node, ptrs) +
627 sizeof(struct btrfs_key_ptr) * nr;
628 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
631 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
635 ptr = offsetof(struct btrfs_node, ptrs) +
636 sizeof(struct btrfs_key_ptr) * nr;
637 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
640 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
642 return offsetof(struct btrfs_node, ptrs) +
643 sizeof(struct btrfs_key_ptr) * nr;
646 void btrfs_node_key(struct extent_buffer *eb,
647 struct btrfs_disk_key *disk_key, int nr);
649 static inline void btrfs_set_node_key(struct extent_buffer *eb,
650 struct btrfs_disk_key *disk_key, int nr)
653 ptr = btrfs_node_key_ptr_offset(nr);
654 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
655 struct btrfs_key_ptr, key, disk_key);
658 /* struct btrfs_item */
659 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
660 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
662 static inline unsigned long btrfs_item_nr_offset(int nr)
664 return offsetof(struct btrfs_leaf, items) +
665 sizeof(struct btrfs_item) * nr;
668 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
671 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
674 static inline u32 btrfs_item_end(struct extent_buffer *eb,
675 struct btrfs_item *item)
677 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
680 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
682 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
685 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
687 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
690 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
692 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
695 static inline void btrfs_item_key(struct extent_buffer *eb,
696 struct btrfs_disk_key *disk_key, int nr)
698 struct btrfs_item *item = btrfs_item_nr(eb, nr);
699 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
702 static inline void btrfs_set_item_key(struct extent_buffer *eb,
703 struct btrfs_disk_key *disk_key, int nr)
705 struct btrfs_item *item = btrfs_item_nr(eb, nr);
706 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
709 /* struct btrfs_dir_item */
710 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
711 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
712 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
714 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
715 struct btrfs_dir_item *item,
716 struct btrfs_disk_key *key)
718 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
721 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
722 struct btrfs_dir_item *item,
723 struct btrfs_disk_key *key)
725 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
728 /* struct btrfs_disk_key */
729 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
731 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
732 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
734 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
735 struct btrfs_disk_key *disk)
737 cpu->offset = le64_to_cpu(disk->offset);
738 cpu->type = disk->type;
739 cpu->objectid = le64_to_cpu(disk->objectid);
742 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
743 struct btrfs_key *cpu)
745 disk->offset = cpu_to_le64(cpu->offset);
746 disk->type = cpu->type;
747 disk->objectid = cpu_to_le64(cpu->objectid);
750 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
751 struct btrfs_key *key, int nr)
753 struct btrfs_disk_key disk_key;
754 btrfs_node_key(eb, &disk_key, nr);
755 btrfs_disk_key_to_cpu(key, &disk_key);
758 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
759 struct btrfs_key *key, int nr)
761 struct btrfs_disk_key disk_key;
762 btrfs_item_key(eb, &disk_key, nr);
763 btrfs_disk_key_to_cpu(key, &disk_key);
766 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
767 struct btrfs_dir_item *item,
768 struct btrfs_key *key)
770 struct btrfs_disk_key disk_key;
771 btrfs_dir_item_key(eb, item, &disk_key);
772 btrfs_disk_key_to_cpu(key, &disk_key);
776 static inline u8 btrfs_key_type(struct btrfs_key *key)
781 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
786 /* struct btrfs_header */
787 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
788 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
790 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
791 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
792 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
793 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
795 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
797 unsigned long ptr = offsetof(struct btrfs_header, fsid);
801 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
803 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
807 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
809 unsigned long ptr = offsetof(struct btrfs_header, csum);
813 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
818 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
823 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
828 static inline int btrfs_is_leaf(struct extent_buffer *eb)
830 return (btrfs_header_level(eb) == 0);
833 /* struct btrfs_root_item */
834 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
835 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
836 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
838 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
839 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
840 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
841 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
842 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
843 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
844 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
846 /* struct btrfs_super_block */
847 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
848 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
850 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
851 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
853 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
855 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
857 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
859 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
861 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
863 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
865 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
866 root_dir_objectid, 64);
868 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
870 return offsetof(struct btrfs_leaf, items);
873 /* struct btrfs_file_extent_item */
874 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
876 static inline unsigned long btrfs_file_extent_inline_start(struct
877 btrfs_file_extent_item *e)
879 unsigned long offset = (unsigned long)e;
880 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
884 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
886 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
889 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
890 struct btrfs_item *e)
892 unsigned long offset;
893 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
894 return btrfs_item_size(eb, e) - offset;
897 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
899 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
901 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
903 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
905 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
908 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
910 return sb->s_fs_info;
913 static inline int btrfs_set_root_name(struct btrfs_root *root,
914 const char *name, int len)
916 /* if we already have a name just free it */
920 root->name = kmalloc(len+1, GFP_KERNEL);
924 memcpy(root->name, name, len);
925 root->name[len] ='\0';
930 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
932 return root->leafsize;
933 return root->nodesize;
936 /* helper function to cast into the data area of the leaf. */
937 #define btrfs_item_ptr(leaf, slot, type) \
938 ((type *)(btrfs_leaf_data(leaf) + \
939 btrfs_item_offset_nr(leaf, slot)))
941 #define btrfs_item_ptr_offset(leaf, slot) \
942 ((unsigned long)(btrfs_leaf_data(leaf) + \
943 btrfs_item_offset_nr(leaf, slot)))
945 static inline struct dentry *fdentry(struct file *file) {
946 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
947 return file->f_dentry;
949 return file->f_path.dentry;
954 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
955 struct btrfs_path *count_path,
957 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
958 struct btrfs_root *root);
959 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
960 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
963 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
964 struct btrfs_block_group_cache
965 *hint, u64 search_start,
966 int data, int owner);
967 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
968 struct btrfs_root *root, u64 owner_objectid);
969 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
970 struct btrfs_root *root, u32 size,
972 u64 hint, u64 empty_size);
973 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
974 struct btrfs_root *root,
982 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
983 struct btrfs_root *root, u64 new_size);
984 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
985 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
986 struct btrfs_root *root,
987 struct btrfs_path *path, u64 bytenr,
988 u64 root_objectid, u64 ref_generation,
989 u64 owner, u64 owner_offset);
990 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
991 struct btrfs_root *root,
992 u64 num_bytes, u64 root_objectid, u64 ref_generation,
993 u64 owner, u64 owner_offset,
994 u64 empty_size, u64 hint_byte,
995 u64 search_end, struct btrfs_key *ins, int data);
996 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
997 struct extent_buffer *buf);
998 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
999 *root, u64 bytenr, u64 num_bytes,
1000 u64 root_objectid, u64 ref_generation,
1001 u64 owner_objectid, u64 owner_offset, int pin);
1002 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1003 struct btrfs_root *root,
1004 struct extent_map_tree *unpin);
1005 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1006 struct btrfs_root *root,
1007 u64 bytenr, u64 num_bytes,
1008 u64 root_objectid, u64 ref_generation,
1009 u64 owner, u64 owner_offset);
1010 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1011 struct btrfs_root *root);
1012 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1013 int btrfs_read_block_groups(struct btrfs_root *root);
1015 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1016 struct btrfs_root *root, struct extent_buffer *buf,
1017 struct extent_buffer *parent, int parent_slot,
1018 struct extent_buffer **cow_ret);
1019 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1020 struct btrfs_root *root,
1021 struct extent_buffer *buf,
1022 struct extent_buffer **cow_ret, u64 new_root_objectid);
1023 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1024 *root, struct btrfs_path *path, u32 data_size);
1025 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1026 struct btrfs_root *root,
1027 struct btrfs_path *path,
1028 u32 new_size, int from_end);
1029 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1030 *root, struct btrfs_key *key, struct btrfs_path *p, int
1032 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1033 struct btrfs_root *root, struct extent_buffer *parent,
1034 int start_slot, int cache_only, u64 *last_ret,
1035 struct btrfs_key *progress);
1036 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1037 struct btrfs_path *btrfs_alloc_path(void);
1038 void btrfs_free_path(struct btrfs_path *p);
1039 void btrfs_init_path(struct btrfs_path *p);
1040 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1041 struct btrfs_path *path);
1042 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1043 *root, struct btrfs_key *key, void *data, u32 data_size);
1044 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1045 *root, struct btrfs_path *path, struct btrfs_key
1046 *cpu_key, u32 data_size);
1047 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1048 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1049 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1050 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1053 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1054 struct btrfs_key *key);
1055 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1056 *root, struct btrfs_key *key, struct btrfs_root_item
1058 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1059 *root, struct btrfs_key *key, struct btrfs_root_item
1061 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1062 btrfs_root_item *item, struct btrfs_key *key);
1063 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1064 struct btrfs_root *latest_root);
1066 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1067 *root, const char *name, int name_len, u64 dir,
1068 struct btrfs_key *location, u8 type);
1069 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1070 struct btrfs_root *root,
1071 struct btrfs_path *path, u64 dir,
1072 const char *name, int name_len,
1074 struct btrfs_dir_item *
1075 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1076 struct btrfs_root *root,
1077 struct btrfs_path *path, u64 dir,
1078 u64 objectid, const char *name, int name_len,
1080 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1081 struct btrfs_path *path,
1082 const char *name, int name_len);
1083 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1084 struct btrfs_root *root,
1085 struct btrfs_path *path,
1086 struct btrfs_dir_item *di);
1087 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1088 struct btrfs_root *root, const char *name,
1089 u16 name_len, const void *data, u16 data_len,
1091 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1092 struct btrfs_root *root,
1093 struct btrfs_path *path, u64 dir,
1094 const char *name, u16 name_len,
1097 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1098 struct btrfs_root *fs_root,
1099 u64 dirid, u64 *objectid);
1100 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1103 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1104 struct btrfs_root *root,
1105 const char *name, int name_len,
1106 u64 inode_objectid, u64 ref_objectid);
1107 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1108 struct btrfs_root *root,
1109 const char *name, int name_len,
1110 u64 inode_objectid, u64 ref_objectid);
1111 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1112 struct btrfs_root *root,
1113 struct btrfs_path *path, u64 objectid);
1114 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1115 *root, struct btrfs_path *path,
1116 struct btrfs_key *location, int mod);
1119 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1120 struct btrfs_root *root,
1121 u64 objectid, u64 pos, u64 offset,
1124 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1125 struct btrfs_root *root,
1126 struct btrfs_path *path, u64 objectid,
1127 u64 bytenr, int mod);
1128 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1129 struct btrfs_root *root,
1130 struct inode *inode,
1131 u64 objectid, u64 offset,
1132 char *data, size_t len);
1133 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1134 struct btrfs_root *root,
1135 struct btrfs_path *path,
1136 u64 objectid, u64 offset,
1138 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1139 struct btrfs_root *root, struct btrfs_path *path,
1142 unsigned long btrfs_force_ra(struct address_space *mapping,
1143 struct file_ra_state *ra, struct file *file,
1144 pgoff_t offset, pgoff_t last_index);
1145 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1147 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1148 int btrfs_readpage(struct file *file, struct page *page);
1149 void btrfs_delete_inode(struct inode *inode);
1150 void btrfs_put_inode(struct inode *inode);
1151 void btrfs_read_locked_inode(struct inode *inode);
1152 int btrfs_write_inode(struct inode *inode, int wait);
1153 void btrfs_dirty_inode(struct inode *inode);
1154 struct inode *btrfs_alloc_inode(struct super_block *sb);
1155 void btrfs_destroy_inode(struct inode *inode);
1156 int btrfs_init_cachep(void);
1157 void btrfs_destroy_cachep(void);
1158 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1159 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1160 struct btrfs_root *root);
1161 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1163 int btrfs_commit_write(struct file *file, struct page *page,
1164 unsigned from, unsigned to);
1165 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1166 size_t page_offset, u64 start, u64 end,
1168 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1169 struct btrfs_root *root,
1170 struct inode *inode);
1172 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1173 extern struct file_operations btrfs_file_operations;
1174 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1175 struct btrfs_root *root, struct inode *inode,
1176 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1178 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1179 struct btrfs_root *root, int cache_only);
1182 int btrfs_init_sysfs(void);
1183 void btrfs_exit_sysfs(void);
1184 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1185 int btrfs_sysfs_add_root(struct btrfs_root *root);
1186 void btrfs_sysfs_del_root(struct btrfs_root *root);
1187 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1190 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1191 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1192 struct btrfs_root *root, struct inode *inode);
1194 u64 btrfs_parse_size(char *str);