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_io.h"
31 #include "extent_map.h"
33 struct btrfs_trans_handle;
34 struct btrfs_transaction;
35 extern struct kmem_cache *btrfs_trans_handle_cachep;
36 extern struct kmem_cache *btrfs_transaction_cachep;
37 extern struct kmem_cache *btrfs_bit_radix_cachep;
38 extern struct kmem_cache *btrfs_path_cachep;
40 #define BTRFS_MAGIC "_B3RfS_M"
42 #define BTRFS_MAX_LEVEL 8
43 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
44 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
45 #define BTRFS_FS_TREE_OBJECTID 3ULL
46 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
47 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
50 * we can actually store much bigger names, but lets not confuse the rest
53 #define BTRFS_NAME_LEN 255
55 /* 32 bytes in various csum fields */
56 #define BTRFS_CSUM_SIZE 32
57 /* four bytes for CRC32 */
58 #define BTRFS_CRC32_SIZE 4
59 #define BTRFS_EMPTY_DIR_SIZE 0
61 #define BTRFS_FT_UNKNOWN 0
62 #define BTRFS_FT_REG_FILE 1
63 #define BTRFS_FT_DIR 2
64 #define BTRFS_FT_CHRDEV 3
65 #define BTRFS_FT_BLKDEV 4
66 #define BTRFS_FT_FIFO 5
67 #define BTRFS_FT_SOCK 6
68 #define BTRFS_FT_SYMLINK 7
69 #define BTRFS_FT_XATTR 8
70 #define BTRFS_FT_MAX 9
73 * the key defines the order in the tree, and so it also defines (optimal)
74 * block layout. objectid corresonds to the inode number. The flags
75 * tells us things about the object, and is a kind of stream selector.
76 * so for a given inode, keys with flags of 1 might refer to the inode
77 * data, flags of 2 may point to file data in the btree and flags == 3
78 * may point to extents.
80 * offset is the starting byte offset for this key in the stream.
82 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
83 * in cpu native order. Otherwise they are identical and their sizes
84 * should be the same (ie both packed)
86 struct btrfs_disk_key {
90 } __attribute__ ((__packed__));
96 } __attribute__ ((__packed__));
98 #define BTRFS_FSID_SIZE 16
100 * every tree block (leaf or node) starts with this header.
102 struct btrfs_header {
103 u8 csum[BTRFS_CSUM_SIZE];
104 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
105 __le64 bytenr; /* which block this node is supposed to live in */
111 } __attribute__ ((__packed__));
113 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
114 sizeof(struct btrfs_header)) / \
115 sizeof(struct btrfs_key_ptr))
116 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
117 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
118 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
119 sizeof(struct btrfs_item) - \
120 sizeof(struct btrfs_file_extent_item))
123 * the super block basically lists the main trees of the FS
124 * it currently lacks any block count etc etc
126 struct btrfs_super_block {
127 u8 csum[BTRFS_CSUM_SIZE];
128 /* the first 3 fields must match struct btrfs_header */
129 u8 fsid[16]; /* FS specific uuid */
130 __le64 bytenr; /* this block number */
136 __le64 root_dir_objectid;
142 } __attribute__ ((__packed__));
145 * A leaf is full of items. offset and size tell us where to find
146 * the item in the leaf (relative to the start of the data area)
149 struct btrfs_disk_key key;
152 } __attribute__ ((__packed__));
155 * leaves have an item area and a data area:
156 * [item0, item1....itemN] [free space] [dataN...data1, data0]
158 * The data is separate from the items to get the keys closer together
162 struct btrfs_header header;
163 struct btrfs_item items[];
164 } __attribute__ ((__packed__));
167 * all non-leaf blocks are nodes, they hold only keys and pointers to
170 struct btrfs_key_ptr {
171 struct btrfs_disk_key key;
174 } __attribute__ ((__packed__));
177 struct btrfs_header header;
178 struct btrfs_key_ptr ptrs[];
179 } __attribute__ ((__packed__));
182 * btrfs_paths remember the path taken from the root down to the leaf.
183 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
184 * to any other levels that are present.
186 * The slots array records the index of the item or block pointer
187 * used while walking the tree.
190 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
191 int slots[BTRFS_MAX_LEVEL];
197 * items in the extent btree are used to record the objectid of the
198 * owner of the block and the number of references
200 struct btrfs_extent_item {
202 } __attribute__ ((__packed__));
204 struct btrfs_extent_ref {
209 } __attribute__ ((__packed__));
211 struct btrfs_inode_ref {
214 } __attribute__ ((__packed__));
216 struct btrfs_inode_timespec {
219 } __attribute__ ((__packed__));
222 * there is no padding here on purpose. If you want to extent the inode,
223 * make a new item type
225 struct btrfs_inode_item {
237 struct btrfs_inode_timespec atime;
238 struct btrfs_inode_timespec ctime;
239 struct btrfs_inode_timespec mtime;
240 struct btrfs_inode_timespec otime;
241 } __attribute__ ((__packed__));
243 struct btrfs_dir_item {
244 struct btrfs_disk_key location;
248 } __attribute__ ((__packed__));
250 struct btrfs_root_item {
251 struct btrfs_inode_item inode;
258 struct btrfs_disk_key drop_progress;
261 } __attribute__ ((__packed__));
263 #define BTRFS_FILE_EXTENT_REG 0
264 #define BTRFS_FILE_EXTENT_INLINE 1
266 struct btrfs_file_extent_item {
270 * disk space consumed by the extent, checksum blocks are included
274 __le64 disk_num_bytes;
276 * the logical offset in file blocks (no csums)
277 * this extent record is for. This allows a file extent to point
278 * into the middle of an existing extent on disk, sharing it
279 * between two snapshots (useful if some bytes in the middle of the
280 * extent have changed
284 * the logical number of file blocks (no csums included)
287 } __attribute__ ((__packed__));
289 struct btrfs_csum_item {
291 } __attribute__ ((__packed__));
293 /* tag for the radix tree of block groups in ram */
294 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
297 #define BTRFS_BLOCK_GROUP_DATA 1
298 #define BTRFS_BLOCK_GROUP_MIXED 2
300 struct btrfs_block_group_item {
303 } __attribute__ ((__packed__));
305 struct btrfs_block_group_cache {
306 struct btrfs_key key;
307 struct btrfs_block_group_item item;
312 struct btrfs_fs_info {
313 u8 fsid[BTRFS_FSID_SIZE];
314 struct btrfs_root *extent_root;
315 struct btrfs_root *tree_root;
316 struct radix_tree_root fs_roots_radix;
318 struct extent_io_tree free_space_cache;
319 struct extent_io_tree block_group_cache;
320 struct extent_io_tree pinned_extents;
321 struct extent_io_tree pending_del;
322 struct extent_io_tree extent_ins;
325 u64 last_trans_committed;
326 unsigned long mount_opt;
329 struct btrfs_transaction *running_transaction;
330 struct btrfs_super_block super_copy;
331 struct extent_buffer *sb_buffer;
332 struct super_block *sb;
333 struct inode *btree_inode;
334 spinlock_t hash_lock;
335 struct mutex trans_mutex;
336 struct mutex fs_mutex;
337 struct list_head trans_list;
338 struct list_head hashers;
339 struct list_head dead_roots;
340 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
341 struct work_struct trans_work;
343 struct delayed_work trans_work;
345 struct kobject super_kobj;
346 struct completion kobj_unregister;
349 unsigned long throttles;
352 spinlock_t delalloc_lock;
353 spinlock_t new_trans_lock;
358 * in ram representation of the tree. extent_root is used for all allocations
359 * and for the extent tree extent_root root.
362 struct extent_buffer *node;
363 struct extent_buffer *commit_root;
364 struct btrfs_root_item root_item;
365 struct btrfs_key root_key;
366 struct btrfs_fs_info *fs_info;
368 struct kobject root_kobj;
369 struct completion kobj_unregister;
373 /* data allocations are done in sectorsize units */
376 /* node allocations are done in nodesize units */
379 /* leaf allocations are done in leafsize units */
386 u64 last_inode_alloc;
388 struct btrfs_key defrag_progress;
396 * inode items have the data typically returned from stat and store other
397 * info about object characteristics. There is one for every file and dir in
400 #define BTRFS_INODE_ITEM_KEY 1
401 #define BTRFS_INODE_REF_KEY 2
402 #define BTRFS_XATTR_ITEM_KEY 8
403 /* reserve 2-15 close to the inode for later flexibility */
406 * dir items are the name -> inode pointers in a directory. There is one
407 * for every name in a directory.
409 #define BTRFS_DIR_ITEM_KEY 16
410 #define BTRFS_DIR_INDEX_KEY 17
412 * extent data is for file data
414 #define BTRFS_EXTENT_DATA_KEY 18
416 * csum items have the checksums for data in the extents
418 #define BTRFS_CSUM_ITEM_KEY 19
420 /* reserve 20-31 for other file stuff */
423 * root items point to tree roots. There are typically in the root
424 * tree used by the super block to find all the other trees
426 #define BTRFS_ROOT_ITEM_KEY 32
428 * extent items are in the extent map tree. These record which blocks
429 * are used, and how many references there are to each block
431 #define BTRFS_EXTENT_ITEM_KEY 33
432 #define BTRFS_EXTENT_REF_KEY 34
435 * block groups give us hints into the extent allocation trees. Which
436 * blocks are free etc etc
438 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
441 * string items are for debugging. They just store a short string of
444 #define BTRFS_STRING_ITEM_KEY 253
446 #define BTRFS_MOUNT_NODATASUM (1 << 0)
447 #define BTRFS_MOUNT_NODATACOW (1 << 1)
448 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
449 #define BTRFS_MOUNT_SSD (1 << 3)
451 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
452 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
453 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
458 #define BTRFS_INODE_NODATASUM (1 << 0)
459 #define BTRFS_INODE_NODATACOW (1 << 1)
460 #define BTRFS_INODE_READONLY (1 << 2)
461 #define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
463 #define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
465 #define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \
467 /* some macros to generate set/get funcs for the struct fields. This
468 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
471 #define le8_to_cpu(v) (v)
472 #define cpu_to_le8(v) (v)
475 #define read_eb_member(eb, ptr, type, member, result) ( \
476 read_extent_buffer(eb, (char *)(result), \
477 ((unsigned long)(ptr)) + \
478 offsetof(type, member), \
479 sizeof(((type *)0)->member)))
481 #define write_eb_member(eb, ptr, type, member, result) ( \
482 write_extent_buffer(eb, (char *)(result), \
483 ((unsigned long)(ptr)) + \
484 offsetof(type, member), \
485 sizeof(((type *)0)->member)))
487 #ifndef BTRFS_SETGET_FUNCS
488 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
489 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
490 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
493 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
494 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
496 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
497 unsigned long offset = offsetof(type, member); \
499 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
500 res = le##bits##_to_cpu(*tmp); \
501 kunmap_atomic(kaddr, KM_USER0); \
504 static inline void btrfs_set_##name(struct extent_buffer *eb, \
507 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
508 unsigned long offset = offsetof(type, member); \
509 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
510 *tmp = cpu_to_le##bits(val); \
511 kunmap_atomic(kaddr, KM_USER0); \
514 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
515 static inline u##bits btrfs_##name(type *s) \
517 return le##bits##_to_cpu(s->member); \
519 static inline void btrfs_set_##name(type *s, u##bits val) \
521 s->member = cpu_to_le##bits(val); \
524 /* struct btrfs_block_group_item */
525 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
527 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
529 BTRFS_SETGET_FUNCS(disk_block_group_flags, struct btrfs_block_group_item,
532 /* struct btrfs_inode_ref */
533 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
535 /* struct btrfs_inode_item */
536 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
537 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
538 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
539 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
540 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
541 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
542 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
543 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
544 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
545 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
546 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
549 static inline struct btrfs_inode_timespec *
550 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
552 unsigned long ptr = (unsigned long)inode_item;
553 ptr += offsetof(struct btrfs_inode_item, atime);
554 return (struct btrfs_inode_timespec *)ptr;
557 static inline struct btrfs_inode_timespec *
558 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
560 unsigned long ptr = (unsigned long)inode_item;
561 ptr += offsetof(struct btrfs_inode_item, mtime);
562 return (struct btrfs_inode_timespec *)ptr;
565 static inline struct btrfs_inode_timespec *
566 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
568 unsigned long ptr = (unsigned long)inode_item;
569 ptr += offsetof(struct btrfs_inode_item, ctime);
570 return (struct btrfs_inode_timespec *)ptr;
573 static inline struct btrfs_inode_timespec *
574 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
576 unsigned long ptr = (unsigned long)inode_item;
577 ptr += offsetof(struct btrfs_inode_item, otime);
578 return (struct btrfs_inode_timespec *)ptr;
581 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
582 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
584 /* struct btrfs_extent_item */
585 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
587 /* struct btrfs_extent_ref */
588 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
589 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
590 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
591 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
593 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
594 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
596 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
598 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
600 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
603 /* struct btrfs_node */
604 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
605 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
607 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
610 ptr = offsetof(struct btrfs_node, ptrs) +
611 sizeof(struct btrfs_key_ptr) * nr;
612 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
615 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
619 ptr = offsetof(struct btrfs_node, ptrs) +
620 sizeof(struct btrfs_key_ptr) * nr;
621 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
624 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
627 ptr = offsetof(struct btrfs_node, ptrs) +
628 sizeof(struct btrfs_key_ptr) * nr;
629 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
632 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
636 ptr = offsetof(struct btrfs_node, ptrs) +
637 sizeof(struct btrfs_key_ptr) * nr;
638 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
641 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
643 return offsetof(struct btrfs_node, ptrs) +
644 sizeof(struct btrfs_key_ptr) * nr;
647 void btrfs_node_key(struct extent_buffer *eb,
648 struct btrfs_disk_key *disk_key, int nr);
650 static inline void btrfs_set_node_key(struct extent_buffer *eb,
651 struct btrfs_disk_key *disk_key, int nr)
654 ptr = btrfs_node_key_ptr_offset(nr);
655 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
656 struct btrfs_key_ptr, key, disk_key);
659 /* struct btrfs_item */
660 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
661 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
663 static inline unsigned long btrfs_item_nr_offset(int nr)
665 return offsetof(struct btrfs_leaf, items) +
666 sizeof(struct btrfs_item) * nr;
669 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
672 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
675 static inline u32 btrfs_item_end(struct extent_buffer *eb,
676 struct btrfs_item *item)
678 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
681 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
683 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
686 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
688 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
691 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
693 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
696 static inline void btrfs_item_key(struct extent_buffer *eb,
697 struct btrfs_disk_key *disk_key, int nr)
699 struct btrfs_item *item = btrfs_item_nr(eb, nr);
700 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
703 static inline void btrfs_set_item_key(struct extent_buffer *eb,
704 struct btrfs_disk_key *disk_key, int nr)
706 struct btrfs_item *item = btrfs_item_nr(eb, nr);
707 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
710 /* struct btrfs_dir_item */
711 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
712 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
713 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
715 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
716 struct btrfs_dir_item *item,
717 struct btrfs_disk_key *key)
719 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
722 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
723 struct btrfs_dir_item *item,
724 struct btrfs_disk_key *key)
726 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
729 /* struct btrfs_disk_key */
730 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
732 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
733 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
735 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
736 struct btrfs_disk_key *disk)
738 cpu->offset = le64_to_cpu(disk->offset);
739 cpu->type = disk->type;
740 cpu->objectid = le64_to_cpu(disk->objectid);
743 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
744 struct btrfs_key *cpu)
746 disk->offset = cpu_to_le64(cpu->offset);
747 disk->type = cpu->type;
748 disk->objectid = cpu_to_le64(cpu->objectid);
751 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
752 struct btrfs_key *key, int nr)
754 struct btrfs_disk_key disk_key;
755 btrfs_node_key(eb, &disk_key, nr);
756 btrfs_disk_key_to_cpu(key, &disk_key);
759 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
760 struct btrfs_key *key, int nr)
762 struct btrfs_disk_key disk_key;
763 btrfs_item_key(eb, &disk_key, nr);
764 btrfs_disk_key_to_cpu(key, &disk_key);
767 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
768 struct btrfs_dir_item *item,
769 struct btrfs_key *key)
771 struct btrfs_disk_key disk_key;
772 btrfs_dir_item_key(eb, item, &disk_key);
773 btrfs_disk_key_to_cpu(key, &disk_key);
777 static inline u8 btrfs_key_type(struct btrfs_key *key)
782 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
787 /* struct btrfs_header */
788 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
789 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
791 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
792 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
793 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
794 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
796 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
798 unsigned long ptr = offsetof(struct btrfs_header, fsid);
802 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
804 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
808 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
810 unsigned long ptr = offsetof(struct btrfs_header, csum);
814 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
819 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
824 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
829 static inline int btrfs_is_leaf(struct extent_buffer *eb)
831 return (btrfs_header_level(eb) == 0);
834 /* struct btrfs_root_item */
835 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
836 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
837 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
839 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
840 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
841 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
842 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
843 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
844 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
845 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
847 /* struct btrfs_super_block */
848 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
849 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
851 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
852 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
854 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
856 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
858 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
860 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
862 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
864 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
866 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
867 root_dir_objectid, 64);
869 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
871 return offsetof(struct btrfs_leaf, items);
874 /* struct btrfs_file_extent_item */
875 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
877 static inline unsigned long btrfs_file_extent_inline_start(struct
878 btrfs_file_extent_item *e)
880 unsigned long offset = (unsigned long)e;
881 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
885 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
887 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
890 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
891 struct btrfs_item *e)
893 unsigned long offset;
894 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
895 return btrfs_item_size(eb, e) - offset;
898 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
900 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
902 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
904 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
906 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
909 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
911 return sb->s_fs_info;
914 static inline int btrfs_set_root_name(struct btrfs_root *root,
915 const char *name, int len)
917 /* if we already have a name just free it */
921 root->name = kmalloc(len+1, GFP_KERNEL);
925 memcpy(root->name, name, len);
926 root->name[len] ='\0';
931 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
933 return root->leafsize;
934 return root->nodesize;
937 /* helper function to cast into the data area of the leaf. */
938 #define btrfs_item_ptr(leaf, slot, type) \
939 ((type *)(btrfs_leaf_data(leaf) + \
940 btrfs_item_offset_nr(leaf, slot)))
942 #define btrfs_item_ptr_offset(leaf, slot) \
943 ((unsigned long)(btrfs_leaf_data(leaf) + \
944 btrfs_item_offset_nr(leaf, slot)))
946 static inline struct dentry *fdentry(struct file *file) {
947 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
948 return file->f_dentry;
950 return file->f_path.dentry;
955 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
956 struct btrfs_path *count_path,
958 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
959 struct btrfs_root *root);
960 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
961 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
964 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
965 struct btrfs_block_group_cache
966 *hint, u64 search_start,
967 int data, int owner);
968 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
969 struct btrfs_root *root, u64 owner_objectid);
970 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
971 struct btrfs_root *root, u32 size,
973 u64 hint, u64 empty_size);
974 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
975 struct btrfs_root *root,
983 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
984 struct btrfs_root *root, u64 new_size);
985 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
986 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
987 struct btrfs_root *root,
988 struct btrfs_path *path, u64 bytenr,
989 u64 root_objectid, u64 ref_generation,
990 u64 owner, u64 owner_offset);
991 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
992 struct btrfs_root *root,
993 u64 num_bytes, u64 root_objectid, u64 ref_generation,
994 u64 owner, u64 owner_offset,
995 u64 empty_size, u64 hint_byte,
996 u64 search_end, struct btrfs_key *ins, int data);
997 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
998 struct extent_buffer *buf);
999 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1000 *root, u64 bytenr, u64 num_bytes,
1001 u64 root_objectid, u64 ref_generation,
1002 u64 owner_objectid, u64 owner_offset, int pin);
1003 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1004 struct btrfs_root *root,
1005 struct extent_io_tree *unpin);
1006 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1007 struct btrfs_root *root,
1008 u64 bytenr, u64 num_bytes,
1009 u64 root_objectid, u64 ref_generation,
1010 u64 owner, u64 owner_offset);
1011 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1012 struct btrfs_root *root);
1013 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1014 int btrfs_read_block_groups(struct btrfs_root *root);
1016 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1017 struct btrfs_root *root, struct extent_buffer *buf,
1018 struct extent_buffer *parent, int parent_slot,
1019 struct extent_buffer **cow_ret);
1020 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1021 struct btrfs_root *root,
1022 struct extent_buffer *buf,
1023 struct extent_buffer **cow_ret, u64 new_root_objectid);
1024 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1025 *root, struct btrfs_path *path, u32 data_size);
1026 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1027 struct btrfs_root *root,
1028 struct btrfs_path *path,
1029 u32 new_size, int from_end);
1030 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1031 *root, struct btrfs_key *key, struct btrfs_path *p, int
1033 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1034 struct btrfs_root *root, struct extent_buffer *parent,
1035 int start_slot, int cache_only, u64 *last_ret,
1036 struct btrfs_key *progress);
1037 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1038 struct btrfs_path *btrfs_alloc_path(void);
1039 void btrfs_free_path(struct btrfs_path *p);
1040 void btrfs_init_path(struct btrfs_path *p);
1041 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1042 struct btrfs_path *path);
1043 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1044 *root, struct btrfs_key *key, void *data, u32 data_size);
1045 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1046 *root, struct btrfs_path *path, struct btrfs_key
1047 *cpu_key, u32 data_size);
1048 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1049 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1050 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1051 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1054 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1055 struct btrfs_key *key);
1056 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1057 *root, struct btrfs_key *key, struct btrfs_root_item
1059 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1060 *root, struct btrfs_key *key, struct btrfs_root_item
1062 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1063 btrfs_root_item *item, struct btrfs_key *key);
1064 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1065 struct btrfs_root *latest_root);
1067 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1068 *root, const char *name, int name_len, u64 dir,
1069 struct btrfs_key *location, u8 type);
1070 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1071 struct btrfs_root *root,
1072 struct btrfs_path *path, u64 dir,
1073 const char *name, int name_len,
1075 struct btrfs_dir_item *
1076 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1077 struct btrfs_root *root,
1078 struct btrfs_path *path, u64 dir,
1079 u64 objectid, const char *name, int name_len,
1081 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1082 struct btrfs_path *path,
1083 const char *name, int name_len);
1084 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1085 struct btrfs_root *root,
1086 struct btrfs_path *path,
1087 struct btrfs_dir_item *di);
1088 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1089 struct btrfs_root *root, const char *name,
1090 u16 name_len, const void *data, u16 data_len,
1092 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1093 struct btrfs_root *root,
1094 struct btrfs_path *path, u64 dir,
1095 const char *name, u16 name_len,
1098 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1099 struct btrfs_root *fs_root,
1100 u64 dirid, u64 *objectid);
1101 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1104 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1105 struct btrfs_root *root,
1106 const char *name, int name_len,
1107 u64 inode_objectid, u64 ref_objectid);
1108 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1109 struct btrfs_root *root,
1110 const char *name, int name_len,
1111 u64 inode_objectid, u64 ref_objectid);
1112 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1113 struct btrfs_root *root,
1114 struct btrfs_path *path, u64 objectid);
1115 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1116 *root, struct btrfs_path *path,
1117 struct btrfs_key *location, int mod);
1120 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1121 struct btrfs_root *root,
1122 u64 objectid, u64 pos, u64 offset,
1125 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1126 struct btrfs_root *root,
1127 struct btrfs_path *path, u64 objectid,
1128 u64 bytenr, int mod);
1129 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1130 struct btrfs_root *root,
1131 struct inode *inode,
1132 u64 objectid, u64 offset,
1133 char *data, size_t len);
1134 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1135 struct btrfs_root *root,
1136 struct btrfs_path *path,
1137 u64 objectid, u64 offset,
1139 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1140 struct btrfs_root *root, struct btrfs_path *path,
1143 unsigned long btrfs_force_ra(struct address_space *mapping,
1144 struct file_ra_state *ra, struct file *file,
1145 pgoff_t offset, pgoff_t last_index);
1146 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1148 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1149 int btrfs_readpage(struct file *file, struct page *page);
1150 void btrfs_delete_inode(struct inode *inode);
1151 void btrfs_put_inode(struct inode *inode);
1152 void btrfs_read_locked_inode(struct inode *inode);
1153 int btrfs_write_inode(struct inode *inode, int wait);
1154 void btrfs_dirty_inode(struct inode *inode);
1155 struct inode *btrfs_alloc_inode(struct super_block *sb);
1156 void btrfs_destroy_inode(struct inode *inode);
1157 int btrfs_init_cachep(void);
1158 void btrfs_destroy_cachep(void);
1159 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1160 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1161 struct btrfs_root *root);
1162 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1164 int btrfs_commit_write(struct file *file, struct page *page,
1165 unsigned from, unsigned to);
1166 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1167 size_t page_offset, u64 start, u64 end,
1169 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1170 struct btrfs_root *root,
1171 struct inode *inode);
1173 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1174 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
1175 extern struct file_operations btrfs_file_operations;
1176 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1177 struct btrfs_root *root, struct inode *inode,
1178 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1180 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1181 struct btrfs_root *root, int cache_only);
1184 int btrfs_init_sysfs(void);
1185 void btrfs_exit_sysfs(void);
1186 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1187 int btrfs_sysfs_add_root(struct btrfs_root *root);
1188 void btrfs_sysfs_del_root(struct btrfs_root *root);
1189 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1192 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1193 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1194 struct btrfs_root *root, struct inode *inode);
1196 u64 btrfs_parse_size(char *str);