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 "_B4RfS_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;
330 struct btrfs_transaction *running_transaction;
331 struct btrfs_super_block super_copy;
332 struct extent_buffer *sb_buffer;
333 struct super_block *sb;
334 struct inode *btree_inode;
335 spinlock_t hash_lock;
336 struct mutex trans_mutex;
337 struct mutex fs_mutex;
338 struct list_head trans_list;
339 struct list_head hashers;
340 struct list_head dead_roots;
341 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
342 struct work_struct trans_work;
344 struct delayed_work trans_work;
346 struct kobject super_kobj;
347 struct completion kobj_unregister;
350 unsigned long throttles;
353 spinlock_t delalloc_lock;
354 spinlock_t new_trans_lock;
360 * in ram representation of the tree. extent_root is used for all allocations
361 * and for the extent tree extent_root root.
364 struct extent_buffer *node;
365 struct extent_buffer *commit_root;
366 struct btrfs_root_item root_item;
367 struct btrfs_key root_key;
368 struct btrfs_fs_info *fs_info;
370 struct kobject root_kobj;
371 struct completion kobj_unregister;
375 /* data allocations are done in sectorsize units */
378 /* node allocations are done in nodesize units */
381 /* leaf allocations are done in leafsize units */
388 u64 last_inode_alloc;
390 struct btrfs_key defrag_progress;
398 * inode items have the data typically returned from stat and store other
399 * info about object characteristics. There is one for every file and dir in
402 #define BTRFS_INODE_ITEM_KEY 1
403 #define BTRFS_INODE_REF_KEY 2
404 #define BTRFS_XATTR_ITEM_KEY 8
405 /* reserve 2-15 close to the inode for later flexibility */
408 * dir items are the name -> inode pointers in a directory. There is one
409 * for every name in a directory.
411 #define BTRFS_DIR_ITEM_KEY 16
412 #define BTRFS_DIR_INDEX_KEY 17
414 * extent data is for file data
416 #define BTRFS_EXTENT_DATA_KEY 18
418 * csum items have the checksums for data in the extents
420 #define BTRFS_CSUM_ITEM_KEY 19
422 /* reserve 20-31 for other file stuff */
425 * root items point to tree roots. There are typically in the root
426 * tree used by the super block to find all the other trees
428 #define BTRFS_ROOT_ITEM_KEY 32
430 * extent items are in the extent map tree. These record which blocks
431 * are used, and how many references there are to each block
433 #define BTRFS_EXTENT_ITEM_KEY 33
434 #define BTRFS_EXTENT_REF_KEY 34
437 * block groups give us hints into the extent allocation trees. Which
438 * blocks are free etc etc
440 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
443 * string items are for debugging. They just store a short string of
446 #define BTRFS_STRING_ITEM_KEY 253
448 #define BTRFS_MOUNT_NODATASUM (1 << 0)
449 #define BTRFS_MOUNT_NODATACOW (1 << 1)
450 #define BTRFS_MOUNT_NOBARRIER (1 << 2)
451 #define BTRFS_MOUNT_SSD (1 << 3)
453 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
454 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
455 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
460 #define BTRFS_INODE_NODATASUM (1 << 0)
461 #define BTRFS_INODE_NODATACOW (1 << 1)
462 #define BTRFS_INODE_READONLY (1 << 2)
463 #define btrfs_clear_flag(inode, flag) (BTRFS_I(inode)->flags &= \
465 #define btrfs_set_flag(inode, flag) (BTRFS_I(inode)->flags |= \
467 #define btrfs_test_flag(inode, flag) (BTRFS_I(inode)->flags & \
469 /* some macros to generate set/get funcs for the struct fields. This
470 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
473 #define le8_to_cpu(v) (v)
474 #define cpu_to_le8(v) (v)
477 #define read_eb_member(eb, ptr, type, member, result) ( \
478 read_extent_buffer(eb, (char *)(result), \
479 ((unsigned long)(ptr)) + \
480 offsetof(type, member), \
481 sizeof(((type *)0)->member)))
483 #define write_eb_member(eb, ptr, type, member, result) ( \
484 write_extent_buffer(eb, (char *)(result), \
485 ((unsigned long)(ptr)) + \
486 offsetof(type, member), \
487 sizeof(((type *)0)->member)))
489 #ifndef BTRFS_SETGET_FUNCS
490 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
491 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
492 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
495 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
496 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
498 type *p = kmap_atomic(eb->first_page, KM_USER0); \
499 u##bits res = le##bits##_to_cpu(p->member); \
500 kunmap_atomic(p, KM_USER0); \
503 static inline void btrfs_set_##name(struct extent_buffer *eb, \
506 type *p = kmap_atomic(eb->first_page, KM_USER0); \
507 p->member = cpu_to_le##bits(val); \
508 kunmap_atomic(p, KM_USER0); \
511 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
512 static inline u##bits btrfs_##name(type *s) \
514 return le##bits##_to_cpu(s->member); \
516 static inline void btrfs_set_##name(type *s, u##bits val) \
518 s->member = cpu_to_le##bits(val); \
521 /* struct btrfs_block_group_item */
522 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
524 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
526 BTRFS_SETGET_FUNCS(disk_block_group_flags, struct btrfs_block_group_item,
529 /* struct btrfs_inode_ref */
530 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
532 /* struct btrfs_inode_item */
533 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
534 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
535 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
536 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
537 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
538 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
539 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
540 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
541 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
542 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
543 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
546 static inline struct btrfs_inode_timespec *
547 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
549 unsigned long ptr = (unsigned long)inode_item;
550 ptr += offsetof(struct btrfs_inode_item, atime);
551 return (struct btrfs_inode_timespec *)ptr;
554 static inline struct btrfs_inode_timespec *
555 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
557 unsigned long ptr = (unsigned long)inode_item;
558 ptr += offsetof(struct btrfs_inode_item, mtime);
559 return (struct btrfs_inode_timespec *)ptr;
562 static inline struct btrfs_inode_timespec *
563 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
565 unsigned long ptr = (unsigned long)inode_item;
566 ptr += offsetof(struct btrfs_inode_item, ctime);
567 return (struct btrfs_inode_timespec *)ptr;
570 static inline struct btrfs_inode_timespec *
571 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
573 unsigned long ptr = (unsigned long)inode_item;
574 ptr += offsetof(struct btrfs_inode_item, otime);
575 return (struct btrfs_inode_timespec *)ptr;
578 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
579 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
581 /* struct btrfs_extent_item */
582 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
584 /* struct btrfs_extent_ref */
585 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
586 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
587 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
588 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
590 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
591 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
593 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
595 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
597 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
600 /* struct btrfs_node */
601 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
602 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
604 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
607 ptr = offsetof(struct btrfs_node, ptrs) +
608 sizeof(struct btrfs_key_ptr) * nr;
609 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
612 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
616 ptr = offsetof(struct btrfs_node, ptrs) +
617 sizeof(struct btrfs_key_ptr) * nr;
618 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
621 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
624 ptr = offsetof(struct btrfs_node, ptrs) +
625 sizeof(struct btrfs_key_ptr) * nr;
626 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
629 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
633 ptr = offsetof(struct btrfs_node, ptrs) +
634 sizeof(struct btrfs_key_ptr) * nr;
635 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
638 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
640 return offsetof(struct btrfs_node, ptrs) +
641 sizeof(struct btrfs_key_ptr) * nr;
644 void btrfs_node_key(struct extent_buffer *eb,
645 struct btrfs_disk_key *disk_key, int nr);
647 static inline void btrfs_set_node_key(struct extent_buffer *eb,
648 struct btrfs_disk_key *disk_key, int nr)
651 ptr = btrfs_node_key_ptr_offset(nr);
652 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
653 struct btrfs_key_ptr, key, disk_key);
656 /* struct btrfs_item */
657 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
658 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
660 static inline unsigned long btrfs_item_nr_offset(int nr)
662 return offsetof(struct btrfs_leaf, items) +
663 sizeof(struct btrfs_item) * nr;
666 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
669 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
672 static inline u32 btrfs_item_end(struct extent_buffer *eb,
673 struct btrfs_item *item)
675 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
678 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
680 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
683 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
685 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
688 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
690 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
693 static inline void btrfs_item_key(struct extent_buffer *eb,
694 struct btrfs_disk_key *disk_key, int nr)
696 struct btrfs_item *item = btrfs_item_nr(eb, nr);
697 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
700 static inline void btrfs_set_item_key(struct extent_buffer *eb,
701 struct btrfs_disk_key *disk_key, int nr)
703 struct btrfs_item *item = btrfs_item_nr(eb, nr);
704 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
707 /* struct btrfs_dir_item */
708 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
709 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
710 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
712 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
713 struct btrfs_dir_item *item,
714 struct btrfs_disk_key *key)
716 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
719 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
720 struct btrfs_dir_item *item,
721 struct btrfs_disk_key *key)
723 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
726 /* struct btrfs_disk_key */
727 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
729 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
730 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
732 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
733 struct btrfs_disk_key *disk)
735 cpu->offset = le64_to_cpu(disk->offset);
736 cpu->type = disk->type;
737 cpu->objectid = le64_to_cpu(disk->objectid);
740 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
741 struct btrfs_key *cpu)
743 disk->offset = cpu_to_le64(cpu->offset);
744 disk->type = cpu->type;
745 disk->objectid = cpu_to_le64(cpu->objectid);
748 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
749 struct btrfs_key *key, int nr)
751 struct btrfs_disk_key disk_key;
752 btrfs_node_key(eb, &disk_key, nr);
753 btrfs_disk_key_to_cpu(key, &disk_key);
756 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
757 struct btrfs_key *key, int nr)
759 struct btrfs_disk_key disk_key;
760 btrfs_item_key(eb, &disk_key, nr);
761 btrfs_disk_key_to_cpu(key, &disk_key);
764 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
765 struct btrfs_dir_item *item,
766 struct btrfs_key *key)
768 struct btrfs_disk_key disk_key;
769 btrfs_dir_item_key(eb, item, &disk_key);
770 btrfs_disk_key_to_cpu(key, &disk_key);
774 static inline u8 btrfs_key_type(struct btrfs_key *key)
779 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
784 /* struct btrfs_header */
785 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
786 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
788 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
789 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
790 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
791 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
793 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
795 unsigned long ptr = offsetof(struct btrfs_header, fsid);
799 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
801 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
805 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
807 unsigned long ptr = offsetof(struct btrfs_header, csum);
811 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
816 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
821 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
826 static inline int btrfs_is_leaf(struct extent_buffer *eb)
828 return (btrfs_header_level(eb) == 0);
831 /* struct btrfs_root_item */
832 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
833 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
834 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
836 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
837 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
838 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
839 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
840 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
841 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
842 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
844 /* struct btrfs_super_block */
845 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
846 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
848 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
849 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
851 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
853 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
855 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
857 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
859 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
861 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
863 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
864 root_dir_objectid, 64);
866 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
868 return offsetof(struct btrfs_leaf, items);
871 /* struct btrfs_file_extent_item */
872 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
874 static inline unsigned long btrfs_file_extent_inline_start(struct
875 btrfs_file_extent_item *e)
877 unsigned long offset = (unsigned long)e;
878 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
882 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
884 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
887 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
888 struct btrfs_item *e)
890 unsigned long offset;
891 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
892 return btrfs_item_size(eb, e) - offset;
895 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
897 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
899 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
901 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
903 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
906 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
908 return sb->s_fs_info;
911 static inline int btrfs_set_root_name(struct btrfs_root *root,
912 const char *name, int len)
914 /* if we already have a name just free it */
918 root->name = kmalloc(len+1, GFP_KERNEL);
922 memcpy(root->name, name, len);
923 root->name[len] ='\0';
928 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
930 return root->leafsize;
931 return root->nodesize;
934 /* helper function to cast into the data area of the leaf. */
935 #define btrfs_item_ptr(leaf, slot, type) \
936 ((type *)(btrfs_leaf_data(leaf) + \
937 btrfs_item_offset_nr(leaf, slot)))
939 #define btrfs_item_ptr_offset(leaf, slot) \
940 ((unsigned long)(btrfs_leaf_data(leaf) + \
941 btrfs_item_offset_nr(leaf, slot)))
943 static inline struct dentry *fdentry(struct file *file) {
944 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
945 return file->f_dentry;
947 return file->f_path.dentry;
952 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
953 struct btrfs_path *count_path,
955 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
956 struct btrfs_root *root);
957 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_io_tree *copy);
958 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
961 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
962 struct btrfs_block_group_cache
963 *hint, u64 search_start,
964 int data, int owner);
965 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
966 struct btrfs_root *root, u64 owner_objectid);
967 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
968 struct btrfs_root *root, u32 size,
970 u64 hint, u64 empty_size);
971 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
972 struct btrfs_root *root,
980 int btrfs_grow_extent_tree(struct btrfs_trans_handle *trans,
981 struct btrfs_root *root, u64 new_size);
982 int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size);
983 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
984 struct btrfs_root *root,
985 struct btrfs_path *path, u64 bytenr,
986 u64 root_objectid, u64 ref_generation,
987 u64 owner, u64 owner_offset);
988 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
989 struct btrfs_root *root,
990 u64 num_bytes, u64 root_objectid, u64 ref_generation,
991 u64 owner, u64 owner_offset,
992 u64 empty_size, u64 hint_byte,
993 u64 search_end, struct btrfs_key *ins, int data);
994 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
995 struct extent_buffer *buf);
996 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
997 *root, u64 bytenr, u64 num_bytes,
998 u64 root_objectid, u64 ref_generation,
999 u64 owner_objectid, u64 owner_offset, int pin);
1000 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1001 struct btrfs_root *root,
1002 struct extent_io_tree *unpin);
1003 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1004 struct btrfs_root *root,
1005 u64 bytenr, u64 num_bytes,
1006 u64 root_objectid, u64 ref_generation,
1007 u64 owner, u64 owner_offset);
1008 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1009 struct btrfs_root *root);
1010 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1011 int btrfs_read_block_groups(struct btrfs_root *root);
1013 int btrfs_cow_block(struct btrfs_trans_handle *trans,
1014 struct btrfs_root *root, struct extent_buffer *buf,
1015 struct extent_buffer *parent, int parent_slot,
1016 struct extent_buffer **cow_ret);
1017 int btrfs_copy_root(struct btrfs_trans_handle *trans,
1018 struct btrfs_root *root,
1019 struct extent_buffer *buf,
1020 struct extent_buffer **cow_ret, u64 new_root_objectid);
1021 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1022 *root, struct btrfs_path *path, u32 data_size);
1023 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1024 struct btrfs_root *root,
1025 struct btrfs_path *path,
1026 u32 new_size, int from_end);
1027 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1028 *root, struct btrfs_key *key, struct btrfs_path *p, int
1030 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1031 struct btrfs_root *root, struct extent_buffer *parent,
1032 int start_slot, int cache_only, u64 *last_ret,
1033 struct btrfs_key *progress);
1034 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1035 struct btrfs_path *btrfs_alloc_path(void);
1036 void btrfs_free_path(struct btrfs_path *p);
1037 void btrfs_init_path(struct btrfs_path *p);
1038 int btrfs_del_items(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1039 struct btrfs_path *path, int slot, int nr);
1041 static inline int btrfs_del_item(struct btrfs_trans_handle *trans,
1042 struct btrfs_root *root,
1043 struct btrfs_path *path)
1045 return btrfs_del_items(trans, root, path, path->slots[0], 1);
1048 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1049 *root, struct btrfs_key *key, void *data, u32 data_size);
1050 int btrfs_insert_empty_items(struct btrfs_trans_handle *trans,
1051 struct btrfs_root *root,
1052 struct btrfs_path *path,
1053 struct btrfs_key *cpu_key, u32 *data_size, int nr);
1055 static inline int btrfs_insert_empty_item(struct btrfs_trans_handle *trans,
1056 struct btrfs_root *root,
1057 struct btrfs_path *path,
1058 struct btrfs_key *key,
1061 return btrfs_insert_empty_items(trans, root, path, key, &data_size, 1);
1064 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1065 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1066 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1067 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1070 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1071 struct btrfs_key *key);
1072 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1073 *root, struct btrfs_key *key, struct btrfs_root_item
1075 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1076 *root, struct btrfs_key *key, struct btrfs_root_item
1078 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1079 btrfs_root_item *item, struct btrfs_key *key);
1080 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1081 struct btrfs_root *latest_root);
1083 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1084 *root, const char *name, int name_len, u64 dir,
1085 struct btrfs_key *location, u8 type);
1086 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1087 struct btrfs_root *root,
1088 struct btrfs_path *path, u64 dir,
1089 const char *name, int name_len,
1091 struct btrfs_dir_item *
1092 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1093 struct btrfs_root *root,
1094 struct btrfs_path *path, u64 dir,
1095 u64 objectid, const char *name, int name_len,
1097 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1098 struct btrfs_path *path,
1099 const char *name, int name_len);
1100 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1101 struct btrfs_root *root,
1102 struct btrfs_path *path,
1103 struct btrfs_dir_item *di);
1104 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1105 struct btrfs_root *root, const char *name,
1106 u16 name_len, const void *data, u16 data_len,
1108 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1109 struct btrfs_root *root,
1110 struct btrfs_path *path, u64 dir,
1111 const char *name, u16 name_len,
1114 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1115 struct btrfs_root *fs_root,
1116 u64 dirid, u64 *objectid);
1117 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1120 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1121 struct btrfs_root *root,
1122 const char *name, int name_len,
1123 u64 inode_objectid, u64 ref_objectid);
1124 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1125 struct btrfs_root *root,
1126 const char *name, int name_len,
1127 u64 inode_objectid, u64 ref_objectid);
1128 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1129 struct btrfs_root *root,
1130 struct btrfs_path *path, u64 objectid);
1131 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1132 *root, struct btrfs_path *path,
1133 struct btrfs_key *location, int mod);
1136 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1137 struct btrfs_root *root,
1138 u64 objectid, u64 pos, u64 offset,
1141 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1142 struct btrfs_root *root,
1143 struct btrfs_path *path, u64 objectid,
1144 u64 bytenr, int mod);
1145 int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
1146 struct btrfs_root *root, struct inode *inode,
1148 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1149 struct btrfs_root *root,
1150 struct btrfs_path *path,
1151 u64 objectid, u64 offset,
1153 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1154 struct btrfs_root *root, struct btrfs_path *path,
1157 static inline void dec_i_blocks(struct inode *inode, u64 dec)
1160 if (dec <= inode->i_blocks)
1161 inode->i_blocks -= dec;
1163 inode->i_blocks = 0;
1166 unsigned long btrfs_force_ra(struct address_space *mapping,
1167 struct file_ra_state *ra, struct file *file,
1168 pgoff_t offset, pgoff_t last_index);
1169 int btrfs_check_free_space(struct btrfs_root *root, u64 num_required,
1171 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1172 int btrfs_readpage(struct file *file, struct page *page);
1173 void btrfs_delete_inode(struct inode *inode);
1174 void btrfs_put_inode(struct inode *inode);
1175 void btrfs_read_locked_inode(struct inode *inode);
1176 int btrfs_write_inode(struct inode *inode, int wait);
1177 void btrfs_dirty_inode(struct inode *inode);
1178 struct inode *btrfs_alloc_inode(struct super_block *sb);
1179 void btrfs_destroy_inode(struct inode *inode);
1180 int btrfs_init_cachep(void);
1181 void btrfs_destroy_cachep(void);
1182 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1183 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1184 struct btrfs_root *root);
1185 struct inode *btrfs_ilookup(struct super_block *s, u64 objectid,
1187 int btrfs_commit_write(struct file *file, struct page *page,
1188 unsigned from, unsigned to);
1189 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1190 size_t page_offset, u64 start, u64 end,
1192 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1193 struct btrfs_root *root,
1194 struct inode *inode);
1196 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1197 int btrfs_check_file(struct btrfs_root *root, struct inode *inode);
1198 extern struct file_operations btrfs_file_operations;
1199 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1200 struct btrfs_root *root, struct inode *inode,
1201 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1203 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1204 struct btrfs_root *root, int cache_only);
1207 int btrfs_init_sysfs(void);
1208 void btrfs_exit_sysfs(void);
1209 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1210 int btrfs_sysfs_add_root(struct btrfs_root *root);
1211 void btrfs_sysfs_del_root(struct btrfs_root *root);
1212 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1215 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1216 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1217 struct btrfs_root *root, struct inode *inode);
1219 u64 btrfs_parse_size(char *str);