2 * Copyright (C) 2007 Oracle. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
23 #include <linux/highmem.h>
25 #include <linux/workqueue.h>
26 #include <linux/completion.h>
27 #include <asm/kmap_types.h>
28 #include "bit-radix.h"
29 #include "extent_map.h"
31 struct btrfs_trans_handle;
32 struct btrfs_transaction;
33 extern struct kmem_cache *btrfs_trans_handle_cachep;
34 extern struct kmem_cache *btrfs_transaction_cachep;
35 extern struct kmem_cache *btrfs_bit_radix_cachep;
36 extern struct kmem_cache *btrfs_path_cachep;
38 #define BTRFS_MAGIC "_B2RfS_M"
40 #define BTRFS_MAX_LEVEL 8
41 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
42 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
43 #define BTRFS_FS_TREE_OBJECTID 3ULL
44 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
45 #define BTRFS_FIRST_FREE_OBJECTID 256ULL
48 * we can actually store much bigger names, but lets not confuse the rest
51 #define BTRFS_NAME_LEN 255
53 /* 32 bytes in various csum fields */
54 #define BTRFS_CSUM_SIZE 32
55 /* four bytes for CRC32 */
56 #define BTRFS_CRC32_SIZE 4
57 #define BTRFS_EMPTY_DIR_SIZE 0
59 #define BTRFS_FT_UNKNOWN 0
60 #define BTRFS_FT_REG_FILE 1
61 #define BTRFS_FT_DIR 2
62 #define BTRFS_FT_CHRDEV 3
63 #define BTRFS_FT_BLKDEV 4
64 #define BTRFS_FT_FIFO 5
65 #define BTRFS_FT_SOCK 6
66 #define BTRFS_FT_SYMLINK 7
67 #define BTRFS_FT_XATTR 8
68 #define BTRFS_FT_MAX 9
71 * the key defines the order in the tree, and so it also defines (optimal)
72 * block layout. objectid corresonds to the inode number. The flags
73 * tells us things about the object, and is a kind of stream selector.
74 * so for a given inode, keys with flags of 1 might refer to the inode
75 * data, flags of 2 may point to file data in the btree and flags == 3
76 * may point to extents.
78 * offset is the starting byte offset for this key in the stream.
80 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
81 * in cpu native order. Otherwise they are identical and their sizes
82 * should be the same (ie both packed)
84 struct btrfs_disk_key {
88 } __attribute__ ((__packed__));
94 } __attribute__ ((__packed__));
96 #define BTRFS_FSID_SIZE 16
98 * every tree block (leaf or node) starts with this header.
100 struct btrfs_header {
101 u8 csum[BTRFS_CSUM_SIZE];
102 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
103 __le64 bytenr; /* which block this node is supposed to live in */
109 } __attribute__ ((__packed__));
111 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
112 sizeof(struct btrfs_header)) / \
113 sizeof(struct btrfs_key_ptr))
114 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
115 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
116 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
117 sizeof(struct btrfs_item) - \
118 sizeof(struct btrfs_file_extent_item))
121 * the super block basically lists the main trees of the FS
122 * it currently lacks any block count etc etc
124 struct btrfs_super_block {
125 u8 csum[BTRFS_CSUM_SIZE];
126 /* the first 3 fields must match struct btrfs_header */
127 u8 fsid[16]; /* FS specific uuid */
128 __le64 bytenr; /* this block number */
134 __le64 root_dir_objectid;
140 } __attribute__ ((__packed__));
143 * A leaf is full of items. offset and size tell us where to find
144 * the item in the leaf (relative to the start of the data area)
147 struct btrfs_disk_key key;
150 } __attribute__ ((__packed__));
153 * leaves have an item area and a data area:
154 * [item0, item1....itemN] [free space] [dataN...data1, data0]
156 * The data is separate from the items to get the keys closer together
160 struct btrfs_header header;
161 struct btrfs_item items[];
162 } __attribute__ ((__packed__));
165 * all non-leaf blocks are nodes, they hold only keys and pointers to
168 struct btrfs_key_ptr {
169 struct btrfs_disk_key key;
172 } __attribute__ ((__packed__));
175 struct btrfs_header header;
176 struct btrfs_key_ptr ptrs[];
177 } __attribute__ ((__packed__));
180 * btrfs_paths remember the path taken from the root down to the leaf.
181 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
182 * to any other levels that are present.
184 * The slots array records the index of the item or block pointer
185 * used while walking the tree.
188 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
189 int slots[BTRFS_MAX_LEVEL];
195 * items in the extent btree are used to record the objectid of the
196 * owner of the block and the number of references
198 struct btrfs_extent_item {
200 } __attribute__ ((__packed__));
202 struct btrfs_extent_ref {
207 } __attribute__ ((__packed__));
209 struct btrfs_inode_ref {
212 } __attribute__ ((__packed__));
214 struct btrfs_inode_timespec {
217 } __attribute__ ((__packed__));
220 * there is no padding here on purpose. If you want to extent the inode,
221 * make a new item type
223 struct btrfs_inode_item {
235 struct btrfs_inode_timespec atime;
236 struct btrfs_inode_timespec ctime;
237 struct btrfs_inode_timespec mtime;
238 struct btrfs_inode_timespec otime;
239 } __attribute__ ((__packed__));
241 struct btrfs_dir_item {
242 struct btrfs_disk_key location;
246 } __attribute__ ((__packed__));
248 struct btrfs_root_item {
249 struct btrfs_inode_item inode;
256 struct btrfs_disk_key drop_progress;
259 } __attribute__ ((__packed__));
261 #define BTRFS_FILE_EXTENT_REG 0
262 #define BTRFS_FILE_EXTENT_INLINE 1
264 struct btrfs_file_extent_item {
268 * disk space consumed by the extent, checksum blocks are included
272 __le64 disk_num_bytes;
274 * the logical offset in file blocks (no csums)
275 * this extent record is for. This allows a file extent to point
276 * into the middle of an existing extent on disk, sharing it
277 * between two snapshots (useful if some bytes in the middle of the
278 * extent have changed
282 * the logical number of file blocks (no csums included)
285 } __attribute__ ((__packed__));
287 struct btrfs_csum_item {
289 } __attribute__ ((__packed__));
291 /* tag for the radix tree of block groups in ram */
292 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
295 #define BTRFS_BLOCK_GROUP_DATA 1
296 #define BTRFS_BLOCK_GROUP_MIXED 2
298 struct btrfs_block_group_item {
301 } __attribute__ ((__packed__));
303 struct btrfs_block_group_cache {
304 struct btrfs_key key;
305 struct btrfs_block_group_item item;
310 struct btrfs_fs_info {
311 u8 fsid[BTRFS_FSID_SIZE];
312 struct btrfs_root *extent_root;
313 struct btrfs_root *tree_root;
314 struct radix_tree_root fs_roots_radix;
316 struct extent_map_tree free_space_cache;
317 struct extent_map_tree block_group_cache;
318 struct extent_map_tree pinned_extents;
319 struct extent_map_tree pending_del;
320 struct extent_map_tree extent_ins;
323 u64 last_trans_committed;
324 unsigned long mount_opt;
326 struct btrfs_transaction *running_transaction;
327 struct btrfs_super_block super_copy;
328 struct extent_buffer *sb_buffer;
329 struct super_block *sb;
330 struct inode *btree_inode;
331 spinlock_t hash_lock;
332 struct mutex trans_mutex;
333 struct mutex fs_mutex;
334 struct list_head trans_list;
335 struct list_head hashers;
336 struct list_head dead_roots;
337 struct delayed_work trans_work;
338 struct kobject super_kobj;
339 struct completion kobj_unregister;
346 * in ram representation of the tree. extent_root is used for all allocations
347 * and for the extent tree extent_root root.
350 struct extent_buffer *node;
351 struct extent_buffer *commit_root;
352 struct btrfs_root_item root_item;
353 struct btrfs_key root_key;
354 struct btrfs_fs_info *fs_info;
356 struct kobject root_kobj;
357 struct completion kobj_unregister;
358 struct rw_semaphore snap_sem;
362 /* data allocations are done in sectorsize units */
365 /* node allocations are done in nodesize units */
368 /* leaf allocations are done in leafsize units */
375 u64 last_inode_alloc;
377 struct btrfs_key defrag_progress;
384 * inode items have the data typically returned from stat and store other
385 * info about object characteristics. There is one for every file and dir in
388 #define BTRFS_INODE_ITEM_KEY 1
389 #define BTRFS_INODE_REF_KEY 2
390 #define BTRFS_XATTR_ITEM_KEY 8
391 /* reserve 2-15 close to the inode for later flexibility */
394 * dir items are the name -> inode pointers in a directory. There is one
395 * for every name in a directory.
397 #define BTRFS_DIR_ITEM_KEY 16
398 #define BTRFS_DIR_INDEX_KEY 17
400 * extent data is for file data
402 #define BTRFS_EXTENT_DATA_KEY 18
404 * csum items have the checksums for data in the extents
406 #define BTRFS_CSUM_ITEM_KEY 19
408 /* reserve 20-31 for other file stuff */
411 * root items point to tree roots. There are typically in the root
412 * tree used by the super block to find all the other trees
414 #define BTRFS_ROOT_ITEM_KEY 32
416 * extent items are in the extent map tree. These record which blocks
417 * are used, and how many references there are to each block
419 #define BTRFS_EXTENT_ITEM_KEY 33
420 #define BTRFS_EXTENT_REF_KEY 34
423 * block groups give us hints into the extent allocation trees. Which
424 * blocks are free etc etc
426 #define BTRFS_BLOCK_GROUP_ITEM_KEY 50
429 * string items are for debugging. They just store a short string of
432 #define BTRFS_STRING_ITEM_KEY 253
434 #define BTRFS_MOUNT_NODATASUM 0x1
435 #define BTRFS_MOUNT_NODATACOW 0x2
437 #define btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt)
438 #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt)
439 #define btrfs_test_opt(root, opt) ((root)->fs_info->mount_opt & \
442 /* some macros to generate set/get funcs for the struct fields. This
443 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
446 #define le8_to_cpu(v) (v)
447 #define cpu_to_le8(v) (v)
450 #define read_eb_member(eb, ptr, type, member, result) ( \
451 read_extent_buffer(eb, (char *)(result), \
452 ((unsigned long)(ptr)) + \
453 offsetof(type, member), \
454 sizeof(((type *)0)->member)))
456 #define write_eb_member(eb, ptr, type, member, result) ( \
457 write_extent_buffer(eb, (char *)(result), \
458 ((unsigned long)(ptr)) + \
459 offsetof(type, member), \
460 sizeof(((type *)0)->member)))
462 #ifndef BTRFS_SETGET_FUNCS
463 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
464 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
465 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
468 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
469 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
471 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
472 unsigned long offset = offsetof(type, member); \
474 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
475 res = le##bits##_to_cpu(*tmp); \
476 kunmap_atomic(kaddr, KM_USER0); \
479 static inline void btrfs_set_##name(struct extent_buffer *eb, \
482 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
483 unsigned long offset = offsetof(type, member); \
484 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
485 *tmp = cpu_to_le##bits(val); \
486 kunmap_atomic(kaddr, KM_USER0); \
489 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
490 static inline u##bits btrfs_##name(type *s) \
492 return le##bits##_to_cpu(s->member); \
494 static inline void btrfs_set_##name(type *s, u##bits val) \
496 s->member = cpu_to_le##bits(val); \
499 /* struct btrfs_block_group_item */
500 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
502 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
505 /* struct btrfs_inode_ref */
506 BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
508 /* struct btrfs_inode_item */
509 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
510 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
511 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
512 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
513 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
514 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
515 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
516 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
517 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
518 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
519 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
522 static inline struct btrfs_inode_timespec *
523 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
525 unsigned long ptr = (unsigned long)inode_item;
526 ptr += offsetof(struct btrfs_inode_item, atime);
527 return (struct btrfs_inode_timespec *)ptr;
530 static inline struct btrfs_inode_timespec *
531 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
533 unsigned long ptr = (unsigned long)inode_item;
534 ptr += offsetof(struct btrfs_inode_item, mtime);
535 return (struct btrfs_inode_timespec *)ptr;
538 static inline struct btrfs_inode_timespec *
539 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
541 unsigned long ptr = (unsigned long)inode_item;
542 ptr += offsetof(struct btrfs_inode_item, ctime);
543 return (struct btrfs_inode_timespec *)ptr;
546 static inline struct btrfs_inode_timespec *
547 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
549 unsigned long ptr = (unsigned long)inode_item;
550 ptr += offsetof(struct btrfs_inode_item, otime);
551 return (struct btrfs_inode_timespec *)ptr;
554 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
555 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
557 /* struct btrfs_extent_item */
558 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
560 /* struct btrfs_extent_ref */
561 BTRFS_SETGET_FUNCS(ref_root, struct btrfs_extent_ref, root, 64);
562 BTRFS_SETGET_FUNCS(ref_generation, struct btrfs_extent_ref, generation, 64);
563 BTRFS_SETGET_FUNCS(ref_objectid, struct btrfs_extent_ref, objectid, 64);
564 BTRFS_SETGET_FUNCS(ref_offset, struct btrfs_extent_ref, offset, 64);
566 BTRFS_SETGET_STACK_FUNCS(stack_ref_root, struct btrfs_extent_ref, root, 64);
567 BTRFS_SETGET_STACK_FUNCS(stack_ref_generation, struct btrfs_extent_ref,
569 BTRFS_SETGET_STACK_FUNCS(stack_ref_objectid, struct btrfs_extent_ref,
571 BTRFS_SETGET_STACK_FUNCS(stack_ref_offset, struct btrfs_extent_ref, offset, 64);
573 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
576 /* struct btrfs_node */
577 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
578 BTRFS_SETGET_FUNCS(key_generation, struct btrfs_key_ptr, generation, 64);
580 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
583 ptr = offsetof(struct btrfs_node, ptrs) +
584 sizeof(struct btrfs_key_ptr) * nr;
585 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
588 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
592 ptr = offsetof(struct btrfs_node, ptrs) +
593 sizeof(struct btrfs_key_ptr) * nr;
594 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
597 static inline u64 btrfs_node_ptr_generation(struct extent_buffer *eb, int nr)
600 ptr = offsetof(struct btrfs_node, ptrs) +
601 sizeof(struct btrfs_key_ptr) * nr;
602 return btrfs_key_generation(eb, (struct btrfs_key_ptr *)ptr);
605 static inline void btrfs_set_node_ptr_generation(struct extent_buffer *eb,
609 ptr = offsetof(struct btrfs_node, ptrs) +
610 sizeof(struct btrfs_key_ptr) * nr;
611 btrfs_set_key_generation(eb, (struct btrfs_key_ptr *)ptr, val);
614 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
616 return offsetof(struct btrfs_node, ptrs) +
617 sizeof(struct btrfs_key_ptr) * nr;
620 void btrfs_node_key(struct extent_buffer *eb,
621 struct btrfs_disk_key *disk_key, int nr);
623 static inline void btrfs_set_node_key(struct extent_buffer *eb,
624 struct btrfs_disk_key *disk_key, int nr)
627 ptr = btrfs_node_key_ptr_offset(nr);
628 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
629 struct btrfs_key_ptr, key, disk_key);
632 /* struct btrfs_item */
633 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
634 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
636 static inline unsigned long btrfs_item_nr_offset(int nr)
638 return offsetof(struct btrfs_leaf, items) +
639 sizeof(struct btrfs_item) * nr;
642 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
645 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
648 static inline u32 btrfs_item_end(struct extent_buffer *eb,
649 struct btrfs_item *item)
651 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
654 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
656 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
659 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
661 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
664 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
666 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
669 static inline void btrfs_item_key(struct extent_buffer *eb,
670 struct btrfs_disk_key *disk_key, int nr)
672 struct btrfs_item *item = btrfs_item_nr(eb, nr);
673 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
676 static inline void btrfs_set_item_key(struct extent_buffer *eb,
677 struct btrfs_disk_key *disk_key, int nr)
679 struct btrfs_item *item = btrfs_item_nr(eb, nr);
680 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
683 /* struct btrfs_dir_item */
684 BTRFS_SETGET_FUNCS(dir_data_len, struct btrfs_dir_item, data_len, 16);
685 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
686 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
688 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
689 struct btrfs_dir_item *item,
690 struct btrfs_disk_key *key)
692 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
695 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
696 struct btrfs_dir_item *item,
697 struct btrfs_disk_key *key)
699 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
702 /* struct btrfs_disk_key */
703 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
705 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
706 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
708 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
709 struct btrfs_disk_key *disk)
711 cpu->offset = le64_to_cpu(disk->offset);
712 cpu->type = disk->type;
713 cpu->objectid = le64_to_cpu(disk->objectid);
716 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
717 struct btrfs_key *cpu)
719 disk->offset = cpu_to_le64(cpu->offset);
720 disk->type = cpu->type;
721 disk->objectid = cpu_to_le64(cpu->objectid);
724 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
725 struct btrfs_key *key, int nr)
727 struct btrfs_disk_key disk_key;
728 btrfs_node_key(eb, &disk_key, nr);
729 btrfs_disk_key_to_cpu(key, &disk_key);
732 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
733 struct btrfs_key *key, int nr)
735 struct btrfs_disk_key disk_key;
736 btrfs_item_key(eb, &disk_key, nr);
737 btrfs_disk_key_to_cpu(key, &disk_key);
740 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
741 struct btrfs_dir_item *item,
742 struct btrfs_key *key)
744 struct btrfs_disk_key disk_key;
745 btrfs_dir_item_key(eb, item, &disk_key);
746 btrfs_disk_key_to_cpu(key, &disk_key);
750 static inline u8 btrfs_key_type(struct btrfs_key *key)
755 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
760 /* struct btrfs_header */
761 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
762 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
764 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
765 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
766 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
767 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
769 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
771 unsigned long ptr = offsetof(struct btrfs_header, fsid);
775 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
777 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
781 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
783 unsigned long ptr = offsetof(struct btrfs_header, csum);
787 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
792 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
797 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
802 static inline int btrfs_is_leaf(struct extent_buffer *eb)
804 return (btrfs_header_level(eb) == 0);
807 /* struct btrfs_root_item */
808 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
809 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
810 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
812 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
813 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
814 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
815 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
816 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
817 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
818 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
820 /* struct btrfs_super_block */
821 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
822 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
824 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
825 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
827 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
829 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
831 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
833 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
835 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
837 BTRFS_SETGET_STACK_FUNCS(super_stripesize, struct btrfs_super_block,
839 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
840 root_dir_objectid, 64);
842 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
844 return offsetof(struct btrfs_leaf, items);
847 /* struct btrfs_file_extent_item */
848 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
850 static inline unsigned long btrfs_file_extent_inline_start(struct
851 btrfs_file_extent_item *e)
853 unsigned long offset = (unsigned long)e;
854 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
858 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
860 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
863 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
864 struct btrfs_item *e)
866 unsigned long offset;
867 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
868 return btrfs_item_size(eb, e) - offset;
871 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
873 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
875 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
877 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
879 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
882 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
884 return sb->s_fs_info;
887 static inline int btrfs_set_root_name(struct btrfs_root *root,
888 const char *name, int len)
890 /* if we already have a name just free it */
894 root->name = kmalloc(len+1, GFP_KERNEL);
898 memcpy(root->name, name, len);
899 root->name[len] ='\0';
904 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
906 return root->leafsize;
907 return root->nodesize;
910 /* helper function to cast into the data area of the leaf. */
911 #define btrfs_item_ptr(leaf, slot, type) \
912 ((type *)(btrfs_leaf_data(leaf) + \
913 btrfs_item_offset_nr(leaf, slot)))
915 #define btrfs_item_ptr_offset(leaf, slot) \
916 ((unsigned long)(btrfs_leaf_data(leaf) + \
917 btrfs_item_offset_nr(leaf, slot)))
920 u32 btrfs_count_snapshots_in_path(struct btrfs_root *root,
921 struct btrfs_path *count_path,
923 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
924 struct btrfs_root *root);
925 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
926 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
929 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
930 struct btrfs_block_group_cache
931 *hint, u64 search_start,
932 int data, int owner);
933 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
934 struct btrfs_root *root, u64 owner_objectid);
935 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
936 struct btrfs_root *root, u32 size,
938 u64 hint, u64 empty_size);
939 struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
940 struct btrfs_root *root,
948 int btrfs_insert_extent_backref(struct btrfs_trans_handle *trans,
949 struct btrfs_root *root,
950 struct btrfs_path *path, u64 bytenr,
951 u64 root_objectid, u64 ref_generation,
952 u64 owner, u64 owner_offset);
953 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
954 struct btrfs_root *root,
955 u64 num_bytes, u64 root_objectid, u64 ref_generation,
956 u64 owner, u64 owner_offset,
957 u64 empty_size, u64 hint_byte,
958 u64 search_end, struct btrfs_key *ins, int data);
959 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
960 struct extent_buffer *buf);
961 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
962 *root, u64 bytenr, u64 num_bytes,
963 u64 root_objectid, u64 ref_generation,
964 u64 owner_objectid, u64 owner_offset, int pin);
965 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
966 struct btrfs_root *root,
967 struct extent_map_tree *unpin);
968 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
969 struct btrfs_root *root,
970 u64 bytenr, u64 num_bytes,
971 u64 root_objectid, u64 ref_generation,
972 u64 owner, u64 owner_offset);
973 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
974 struct btrfs_root *root);
975 int btrfs_free_block_groups(struct btrfs_fs_info *info);
976 int btrfs_read_block_groups(struct btrfs_root *root);
978 int btrfs_cow_block(struct btrfs_trans_handle *trans,
979 struct btrfs_root *root, struct extent_buffer *buf,
980 struct extent_buffer *parent, int parent_slot,
981 struct extent_buffer **cow_ret);
982 int btrfs_copy_root(struct btrfs_trans_handle *trans,
983 struct btrfs_root *root,
984 struct extent_buffer *buf,
985 struct extent_buffer **cow_ret, u64 new_root_objectid);
986 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
987 *root, struct btrfs_path *path, u32 data_size);
988 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
989 struct btrfs_root *root,
990 struct btrfs_path *path,
991 u32 new_size, int from_end);
992 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
993 *root, struct btrfs_key *key, struct btrfs_path *p, int
995 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
996 struct btrfs_root *root, struct extent_buffer *parent,
997 int start_slot, int cache_only, u64 *last_ret,
998 struct btrfs_key *progress);
999 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1000 struct btrfs_path *btrfs_alloc_path(void);
1001 void btrfs_free_path(struct btrfs_path *p);
1002 void btrfs_init_path(struct btrfs_path *p);
1003 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1004 struct btrfs_path *path);
1005 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1006 *root, struct btrfs_key *key, void *data, u32 data_size);
1007 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1008 *root, struct btrfs_path *path, struct btrfs_key
1009 *cpu_key, u32 data_size);
1010 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1011 int btrfs_prev_leaf(struct btrfs_root *root, struct btrfs_path *path);
1012 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
1013 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1016 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1017 struct btrfs_key *key);
1018 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1019 *root, struct btrfs_key *key, struct btrfs_root_item
1021 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1022 *root, struct btrfs_key *key, struct btrfs_root_item
1024 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1025 btrfs_root_item *item, struct btrfs_key *key);
1026 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1027 struct btrfs_root *latest_root);
1029 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1030 *root, const char *name, int name_len, u64 dir,
1031 struct btrfs_key *location, u8 type);
1032 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1033 struct btrfs_root *root,
1034 struct btrfs_path *path, u64 dir,
1035 const char *name, int name_len,
1037 struct btrfs_dir_item *
1038 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1039 struct btrfs_root *root,
1040 struct btrfs_path *path, u64 dir,
1041 u64 objectid, const char *name, int name_len,
1043 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1044 struct btrfs_path *path,
1045 const char *name, int name_len);
1046 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1047 struct btrfs_root *root,
1048 struct btrfs_path *path,
1049 struct btrfs_dir_item *di);
1050 int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
1051 struct btrfs_root *root, const char *name,
1052 u16 name_len, const void *data, u16 data_len,
1054 struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
1055 struct btrfs_root *root,
1056 struct btrfs_path *path, u64 dir,
1057 const char *name, u16 name_len,
1060 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1061 struct btrfs_root *fs_root,
1062 u64 dirid, u64 *objectid);
1063 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1066 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
1067 struct btrfs_root *root,
1068 const char *name, int name_len,
1069 u64 inode_objectid, u64 ref_objectid);
1070 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
1071 struct btrfs_root *root,
1072 const char *name, int name_len,
1073 u64 inode_objectid, u64 ref_objectid);
1074 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
1075 struct btrfs_root *root,
1076 struct btrfs_path *path, u64 objectid);
1077 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1078 *root, struct btrfs_path *path,
1079 struct btrfs_key *location, int mod);
1082 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1083 struct btrfs_root *root,
1084 u64 objectid, u64 pos, u64 offset,
1087 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1088 struct btrfs_root *root,
1089 struct btrfs_path *path, u64 objectid,
1090 u64 bytenr, int mod);
1091 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1092 struct btrfs_root *root,
1093 struct inode *inode,
1094 u64 objectid, u64 offset,
1095 char *data, size_t len);
1096 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1097 struct btrfs_root *root,
1098 struct btrfs_path *path,
1099 u64 objectid, u64 offset,
1101 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1102 struct btrfs_root *root, struct btrfs_path *path,
1105 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1106 int btrfs_readpage(struct file *file, struct page *page);
1107 void btrfs_delete_inode(struct inode *inode);
1108 void btrfs_read_locked_inode(struct inode *inode);
1109 int btrfs_write_inode(struct inode *inode, int wait);
1110 void btrfs_dirty_inode(struct inode *inode);
1111 struct inode *btrfs_alloc_inode(struct super_block *sb);
1112 void btrfs_destroy_inode(struct inode *inode);
1113 int btrfs_init_cachep(void);
1114 void btrfs_destroy_cachep(void);
1115 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1116 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1117 struct btrfs_root *root);
1118 int btrfs_commit_write(struct file *file, struct page *page,
1119 unsigned from, unsigned to);
1120 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1121 size_t page_offset, u64 start, u64 end,
1123 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1124 struct btrfs_root *root,
1125 struct inode *inode);
1127 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1128 extern struct file_operations btrfs_file_operations;
1129 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1130 struct btrfs_root *root, struct inode *inode,
1131 u64 start, u64 end, u64 inline_limit, u64 *hint_block);
1133 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1134 struct btrfs_root *root, int cache_only);
1137 int btrfs_init_sysfs(void);
1138 void btrfs_exit_sysfs(void);
1139 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1140 int btrfs_sysfs_add_root(struct btrfs_root *root);
1141 void btrfs_sysfs_del_root(struct btrfs_root *root);
1142 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
1145 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
1146 int btrfs_delete_xattrs(struct btrfs_trans_handle *trans,
1147 struct btrfs_root *root, struct inode *inode);