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.
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 "_B2RfS_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;
327 struct btrfs_transaction *running_transaction;
328 struct btrfs_super_block super_copy;
329 struct extent_buffer *sb_buffer;
330 struct super_block *sb;
331 struct inode *btree_inode;
332 spinlock_t hash_lock;
333 struct mutex trans_mutex;
334 struct mutex fs_mutex;
335 struct list_head trans_list;
336 struct list_head hashers;
337 struct list_head dead_roots;
338 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
339 struct work_struct trans_work;
341 struct delayed_work trans_work;
343 struct kobject super_kobj;
344 struct completion kobj_unregister;
351 * in ram representation of the tree. extent_root is used for all allocations
352 * and for the extent tree extent_root root.
355 struct extent_buffer *node;
356 struct extent_buffer *commit_root;
357 struct btrfs_root_item root_item;
358 struct btrfs_key root_key;
359 struct btrfs_fs_info *fs_info;
361 struct kobject root_kobj;
362 struct completion kobj_unregister;
363 struct rw_semaphore snap_sem;
367 /* data allocations are done in sectorsize units */
370 /* node allocations are done in nodesize units */
373 /* leaf allocations are done in leafsize units */
380 u64 last_inode_alloc;
382 struct btrfs_key defrag_progress;
389 * inode items have the data typically returned from stat and store other
390 * info about object characteristics. There is one for every file and dir in
393 #define BTRFS_INODE_ITEM_KEY 1
394 #define BTRFS_INODE_REF_KEY 2
395 #define BTRFS_XATTR_ITEM_KEY 8
396 /* reserve 2-15 close to the inode for later flexibility */
399 * dir items are the name -> inode pointers in a directory. There is one
400 * for every name in a directory.
402 #define BTRFS_DIR_ITEM_KEY 16
403 #define BTRFS_DIR_INDEX_KEY 17
405 * extent data is for file data
407 #define BTRFS_EXTENT_DATA_KEY 18
409 * csum items have the checksums for data in the extents
411 #define BTRFS_CSUM_ITEM_KEY 19
413 /* reserve 20-31 for other file stuff */
416 * root items point to tree roots. There are typically in the root
417 * tree used by the super block to find all the other trees
419 #define BTRFS_ROOT_ITEM_KEY 32
421 * extent items are in the extent map tree. These record which blocks
422 * are used, and how many references there are to each block
424 #define BTRFS_EXTENT_ITEM_KEY 33
425 #define BTRFS_EXTENT_REF_KEY 34
428 * block groups give us hints into the extent allocation trees. Which
429 * blocks are free etc etc
431 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
434 * string items are for debugging. They just store a short string of
437 #define BTRFS_STRING_ITEM_KEY 253
439 #define BTRFS_MOUNT_NODATASUM 0x1
440 #define BTRFS_MOUNT_NODATACOW 0x2
442 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
443 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
444 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
447 /* some macros to generate set/get funcs for the struct fields. This
448 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
451 #define le8_to_cpu(v) (v)
452 #define cpu_to_le8(v) (v)
455 #define read_eb_member(eb, ptr, type, member, result) ( \
456 read_extent_buffer(eb, (char *)(result), \
457 ((unsigned long)(ptr)) + \
458 offsetof(type, member), \
459 sizeof(((type *)0)->member)))
461 #define write_eb_member(eb, ptr, type, member, result) ( \
462 write_extent_buffer(eb, (char *)(result), \
463 ((unsigned long)(ptr)) + \
464 offsetof(type, member), \
465 sizeof(((type *)0)->member)))
467 #ifndef BTRFS_SETGET_FUNCS
468 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
469 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
470 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
473 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
474 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
476 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
477 unsigned long offset = offsetof(type, member); \
479 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
480 res = le##bits##_to_cpu(*tmp); \
481 kunmap_atomic(kaddr, KM_USER0); \
484 static inline void btrfs_set_##name(struct extent_buffer *eb, \
487 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
488 unsigned long offset = offsetof(type, member); \
489 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
490 *tmp = cpu_to_le##bits(val); \
491 kunmap_atomic(kaddr, KM_USER0); \
494 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
495 static inline u##bits btrfs_##name(type *s) \
497 return le##bits##_to_cpu(s->member); \
499 static inline void btrfs_set_##name(type *s, u##bits val) \
501 s->member = cpu_to_le##bits(val); \
504 /* struct btrfs_block_group_item */
505 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
507 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
510 /* struct btrfs_inode_ref */
511 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
513 /* struct btrfs_inode_item */
514 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
515 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
516 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
517 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
518 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
519 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
520 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
521 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
522 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
523 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
524 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
527 static inline struct btrfs_inode_timespec *
528 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
530 unsigned long ptr = (unsigned long)inode_item;
531 ptr += offsetof(struct btrfs_inode_item, atime);
532 return (struct btrfs_inode_timespec *)ptr;
535 static inline struct btrfs_inode_timespec *
536 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
538 unsigned long ptr = (unsigned long)inode_item;
539 ptr += offsetof(struct btrfs_inode_item, mtime);
540 return (struct btrfs_inode_timespec *)ptr;
543 static inline struct btrfs_inode_timespec *
544 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
546 unsigned long ptr = (unsigned long)inode_item;
547 ptr += offsetof(struct btrfs_inode_item, ctime);
548 return (struct btrfs_inode_timespec *)ptr;
551 static inline struct btrfs_inode_timespec *
552 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
554 unsigned long ptr = (unsigned long)inode_item;
555 ptr += offsetof(struct btrfs_inode_item, otime);
556 return (struct btrfs_inode_timespec *)ptr;
559 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
560 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
562 /* struct btrfs_extent_item */
563 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
565 /* struct btrfs_extent_ref */
566 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
567 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
568 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
569 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
571 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
572 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
574 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
576 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
578 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
581 /* struct btrfs_node */
582 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
583 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
585 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
588 ptr = offsetof(struct btrfs_node, ptrs) +
589 sizeof(struct btrfs_key_ptr) * nr;
590 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
593 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
597 ptr = offsetof(struct btrfs_node, ptrs) +
598 sizeof(struct btrfs_key_ptr) * nr;
599 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
602 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
605 ptr = offsetof(struct btrfs_node, ptrs) +
606 sizeof(struct btrfs_key_ptr) * nr;
607 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
610 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
614 ptr = offsetof(struct btrfs_node, ptrs) +
615 sizeof(struct btrfs_key_ptr) * nr;
616 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
619 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
621 return offsetof(struct btrfs_node, ptrs) +
622 sizeof(struct btrfs_key_ptr) * nr;
625 void btrfs_node_key(struct extent_buffer *eb,
626 struct btrfs_disk_key *disk_key, int nr);
628 static inline void btrfs_set_node_key(struct extent_buffer *eb,
629 struct btrfs_disk_key *disk_key, int nr)
632 ptr = btrfs_node_key_ptr_offset(nr);
633 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
634 struct btrfs_key_ptr, key, disk_key);
637 /* struct btrfs_item */
638 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
639 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
641 static inline unsigned long btrfs_item_nr_offset(int nr)
643 return offsetof(struct btrfs_leaf, items) +
644 sizeof(struct btrfs_item) * nr;
647 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
650 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
653 static inline u32 btrfs_item_end(struct extent_buffer *eb,
654 struct btrfs_item *item)
656 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
659 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
661 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
664 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
666 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
669 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
671 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
674 static inline void btrfs_item_key(struct extent_buffer *eb,
675 struct btrfs_disk_key *disk_key, int nr)
677 struct btrfs_item *item = btrfs_item_nr(eb, nr);
678 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
681 static inline void btrfs_set_item_key(struct extent_buffer *eb,
682 struct btrfs_disk_key *disk_key, int nr)
684 struct btrfs_item *item = btrfs_item_nr(eb, nr);
685 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
688 /* struct btrfs_dir_item */
689 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
690 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
691 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
693 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
694 struct btrfs_dir_item *item,
695 struct btrfs_disk_key *key)
697 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
700 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
701 struct btrfs_dir_item *item,
702 struct btrfs_disk_key *key)
704 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
707 /* struct btrfs_disk_key */
708 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
710 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
711 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
713 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
714 struct btrfs_disk_key *disk)
716 cpu->offset = le64_to_cpu(disk->offset);
717 cpu->type = disk->type;
718 cpu->objectid = le64_to_cpu(disk->objectid);
721 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
722 struct btrfs_key *cpu)
724 disk->offset = cpu_to_le64(cpu->offset);
725 disk->type = cpu->type;
726 disk->objectid = cpu_to_le64(cpu->objectid);
729 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
730 struct btrfs_key *key, int nr)
732 struct btrfs_disk_key disk_key;
733 btrfs_node_key(eb, &disk_key, nr);
734 btrfs_disk_key_to_cpu(key, &disk_key);
737 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
738 struct btrfs_key *key, int nr)
740 struct btrfs_disk_key disk_key;
741 btrfs_item_key(eb, &disk_key, nr);
742 btrfs_disk_key_to_cpu(key, &disk_key);
745 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
746 struct btrfs_dir_item *item,
747 struct btrfs_key *key)
749 struct btrfs_disk_key disk_key;
750 btrfs_dir_item_key(eb, item, &disk_key);
751 btrfs_disk_key_to_cpu(key, &disk_key);
755 static inline u8 btrfs_key_type(struct btrfs_key *key)
760 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
765 /* struct btrfs_header */
766 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
767 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
769 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
770 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
771 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
772 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
774 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
776 unsigned long ptr = offsetof(struct btrfs_header, fsid);
780 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
782 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
786 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
788 unsigned long ptr = offsetof(struct btrfs_header, csum);
792 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
797 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
802 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
807 static inline int btrfs_is_leaf(struct extent_buffer *eb)
809 return (btrfs_header_level(eb) == 0);
812 /* struct btrfs_root_item */
813 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
814 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
815 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
817 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
818 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
819 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
820 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
821 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
822 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
823 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
825 /* struct btrfs_super_block */
826 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
827 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
829 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
830 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
832 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
834 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
836 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
838 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
840 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
842 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
844 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
845 root_dir_objectid, 64);
847 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
849 return offsetof(struct btrfs_leaf, items);
852 /* struct btrfs_file_extent_item */
853 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
855 static inline unsigned long btrfs_file_extent_inline_start(struct
856 btrfs_file_extent_item *e)
858 unsigned long offset = (unsigned long)e;
859 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
863 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
865 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
868 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
869 struct btrfs_item *e)
871 unsigned long offset;
872 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
873 return btrfs_item_size(eb, e) - offset;
876 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
878 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
880 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
882 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
884 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
887 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
889 return sb->s_fs_info;
892 static inline int btrfs_set_root_name(struct btrfs_root *root,
893 const char *name, int len)
895 /* if we already have a name just free it */
899 root->name = kmalloc(len+1, GFP_KERNEL);
903 memcpy(root->name, name, len);
904 root->name[len] ='\0';
909 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
911 return root->leafsize;
912 return root->nodesize;
915 /* helper function to cast into the data area of the leaf. */
916 #define btrfs_item_ptr(leaf, slot, type) \
917 ((type *)(btrfs_leaf_data(leaf) + \
918 btrfs_item_offset_nr(leaf, slot)))
920 #define btrfs_item_ptr_offset(leaf, slot) \
921 ((unsigned long)(btrfs_leaf_data(leaf) + \
922 btrfs_item_offset_nr(leaf, slot)))
924 static inline struct dentry *fdentry(struct file *file) {
925 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18)
926 return file->f_dentry;
928 return file->f_path.dentry;
933 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
934 struct btrfs_path *count_path,
936 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
937 struct btrfs_root *root);
938 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
939 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
942 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
943 struct btrfs_block_group_cache
944 *hint, u64 search_start,
945 int data, int owner);
946 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
947 struct btrfs_root *root, u64 owner_objectid);
948 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
949 struct btrfs_root *root, u32 size,
951 u64 hint, u64 empty_size);
952 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
953 struct btrfs_root *root,
961 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
962 struct btrfs_root *root,
963 struct btrfs_path *path, u64 bytenr,
964 u64 root_objectid, u64 ref_generation,
965 u64 owner, u64 owner_offset);
966 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
967 struct btrfs_root *root,
968 u64 num_bytes, u64 root_objectid, u64 ref_generation,
969 u64 owner, u64 owner_offset,
970 u64 empty_size, u64 hint_byte,
971 u64 search_end, struct btrfs_key *ins, int data);
972 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
973 struct extent_buffer *buf);
974 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
975 *root, u64 bytenr, u64 num_bytes,
976 u64 root_objectid, u64 ref_generation,
977 u64 owner_objectid, u64 owner_offset, int pin);
978 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
979 struct btrfs_root *root,
980 struct extent_map_tree *unpin);
981 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
982 struct btrfs_root *root,
983 u64 bytenr, u64 num_bytes,
984 u64 root_objectid, u64 ref_generation,
985 u64 owner, u64 owner_offset);
986 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
987 struct btrfs_root *root);
988 int btrfs_free_block_groups(struct btrfs_fs_info *info);
989 int btrfs_read_block_groups(struct btrfs_root *root);
991 int btrfs_cow_block(struct btrfs_trans_handle *trans,
992 struct btrfs_root *root, struct extent_buffer *buf,
993 struct extent_buffer *parent, int parent_slot,
994 struct extent_buffer **cow_ret);
995 int btrfs_copy_root(struct btrfs_trans_handle *trans,
996 struct btrfs_root *root,
997 struct extent_buffer *buf,
998 struct extent_buffer **cow_ret, u64 new_root_objectid);
999 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1000 *root, struct btrfs_path *path, u32 data_size);
1001 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1002 struct btrfs_root *root,
1003 struct btrfs_path *path,
1004 u32 new_size, int from_end);
1005 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1006 *root, struct btrfs_key *key, struct btrfs_path *p, int
1008 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1009 struct btrfs_root *root, struct extent_buffer *parent,
1010 int start_slot, int cache_only, u64 *last_ret,
1011 struct btrfs_key *progress);
1012 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1013 struct btrfs_path *btrfs_alloc_path(void);
1014 void btrfs_free_path(struct btrfs_path *p);
1015 void btrfs_init_path(struct btrfs_path *p);
1016 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1017 struct btrfs_path *path);
1018 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1019 *root, struct btrfs_key *key, void *data, u32 data_size);
1020 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1021 *root, struct btrfs_path *path, struct btrfs_key
1022 *cpu_key, u32 data_size);
1023 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1024 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1025 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1026 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1029 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1030 struct btrfs_key *key);
1031 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1032 *root, struct btrfs_key *key, struct btrfs_root_item
1034 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1035 *root, struct btrfs_key *key, struct btrfs_root_item
1037 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1038 btrfs_root_item *item, struct btrfs_key *key);
1039 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1040 struct btrfs_root *latest_root);
1042 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1043 *root, const char *name, int name_len, u64 dir,
1044 struct btrfs_key *location, u8 type);
1045 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1046 struct btrfs_root *root,
1047 struct btrfs_path *path, u64 dir,
1048 const char *name, int name_len,
1050 struct btrfs_dir_item *
1051 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1052 struct btrfs_root *root,
1053 struct btrfs_path *path, u64 dir,
1054 u64 objectid, const char *name, int name_len,
1056 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1057 struct btrfs_path *path,
1058 const char *name, int name_len);
1059 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1060 struct btrfs_root *root,
1061 struct btrfs_path *path,
1062 struct btrfs_dir_item *di);
1063 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1064 struct btrfs_root *root, const char *name,
1065 u16 name_len, const void *data, u16 data_len,
1067 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1068 struct btrfs_root *root,
1069 struct btrfs_path *path, u64 dir,
1070 const char *name, u16 name_len,
1073 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1074 struct btrfs_root *fs_root,
1075 u64 dirid, u64 *objectid);
1076 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1079 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1080 struct btrfs_root *root,
1081 const char *name, int name_len,
1082 u64 inode_objectid, u64 ref_objectid);
1083 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1084 struct btrfs_root *root,
1085 const char *name, int name_len,
1086 u64 inode_objectid, u64 ref_objectid);
1087 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1088 struct btrfs_root *root,
1089 struct btrfs_path *path, u64 objectid);
1090 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1091 *root, struct btrfs_path *path,
1092 struct btrfs_key *location, int mod);
1095 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1096 struct btrfs_root *root,
1097 u64 objectid, u64 pos, u64 offset,
1100 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1101 struct btrfs_root *root,
1102 struct btrfs_path *path, u64 objectid,
1103 u64 bytenr, int mod);
1104 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1105 struct btrfs_root *root,
1106 struct inode *inode,
1107 u64 objectid, u64 offset,
1108 char *data, size_t len);
1109 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1110 struct btrfs_root *root,
1111 struct btrfs_path *path,
1112 u64 objectid, u64 offset,
1114 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1115 struct btrfs_root *root, struct btrfs_path *path,
1118 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1119 int btrfs_readpage(struct file *file, struct page *page);
1120 void btrfs_delete_inode(struct inode *inode);
1121 void btrfs_read_locked_inode(struct inode *inode);
1122 int btrfs_write_inode(struct inode *inode, int wait);
1123 void btrfs_dirty_inode(struct inode *inode);
1124 struct inode *btrfs_alloc_inode(struct super_block *sb);
1125 void btrfs_destroy_inode(struct inode *inode);
1126 int btrfs_init_cachep(void);
1127 void btrfs_destroy_cachep(void);
1128 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1129 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1130 struct btrfs_root *root);
1131 int btrfs_commit_write(struct file *file, struct page *page,
1132 unsigned from, unsigned to);
1133 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1134 size_t page_offset, u64 start, u64 end,
1136 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1137 struct btrfs_root *root,
1138 struct inode *inode);
1140 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1141 extern struct file_operations btrfs_file_operations;
1142 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1143 struct btrfs_root *root, struct inode *inode,
1144 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1146 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1147 struct btrfs_root *root, int cache_only);
1150 int btrfs_init_sysfs(void);
1151 void btrfs_exit_sysfs(void);
1152 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1153 int btrfs_sysfs_add_root(struct btrfs_root *root);
1154 void btrfs_sysfs_del_root(struct btrfs_root *root);
1155 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1158 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1159 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1160 struct btrfs_root *root, struct inode *inode);