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_ROOT_TREE_OBJECTID 1ULL
41 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
42 #define BTRFS_FS_TREE_OBJECTID 3ULL
43 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
44 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
47 * we can actually store much bigger names, but lets not confuse the rest
50 #define BTRFS_NAME_LEN 255
52 /* 32 bytes in various csum fields */
53 #define BTRFS_CSUM_SIZE 32
54 /* four bytes for CRC32 */
55 #define BTRFS_CRC32_SIZE 4
56 #define BTRFS_EMPTY_DIR_SIZE 6
58 #define BTRFS_FT_UNKNOWN 0
59 #define BTRFS_FT_REG_FILE 1
60 #define BTRFS_FT_DIR 2
61 #define BTRFS_FT_CHRDEV 3
62 #define BTRFS_FT_BLKDEV 4
63 #define BTRFS_FT_FIFO 5
64 #define BTRFS_FT_SOCK 6
65 #define BTRFS_FT_SYMLINK 7
66 #define BTRFS_FT_MAX 8
69 * the key defines the order in the tree, and so it also defines (optimal)
70 * block layout. objectid corresonds to the inode number. The flags
71 * tells us things about the object, and is a kind of stream selector.
72 * so for a given inode, keys with flags of 1 might refer to the inode
73 * data, flags of 2 may point to file data in the btree and flags == 3
74 * may point to extents.
76 * offset is the starting byte offset for this key in the stream.
78 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
79 * in cpu native order. Otherwise they are identical and their sizes
80 * should be the same (ie both packed)
82 struct btrfs_disk_key {
86 } __attribute__ ((__packed__));
92 } __attribute__ ((__packed__));
94 #define BTRFS_FSID_SIZE 16
96 * every tree block (leaf or node) starts with this header.
99 u8 csum[BTRFS_CSUM_SIZE];
100 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
101 __le64 bytenr; /* which block this node is supposed to live in */
107 } __attribute__ ((__packed__));
109 #define BTRFS_MAX_LEVEL 8
110 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->nodesize - \
111 sizeof(struct btrfs_header)) / \
112 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
113 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
114 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->leafsize))
115 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
116 sizeof(struct btrfs_item) - \
117 sizeof(struct btrfs_file_extent_item))
120 * the super block basically lists the main trees of the FS
121 * it currently lacks any block count etc etc
123 struct btrfs_super_block {
124 u8 csum[BTRFS_CSUM_SIZE];
125 /* the first 3 fields must match struct btrfs_header */
126 u8 fsid[16]; /* FS specific uuid */
127 __le64 bytenr; /* this block number */
133 __le64 root_dir_objectid;
138 } __attribute__ ((__packed__));
141 * A leaf is full of items. offset and size tell us where to find
142 * the item in the leaf (relative to the start of the data area)
145 struct btrfs_disk_key key;
148 } __attribute__ ((__packed__));
151 * leaves have an item area and a data area:
152 * [item0, item1....itemN] [free space] [dataN...data1, data0]
154 * The data is separate from the items to get the keys closer together
158 struct btrfs_header header;
159 struct btrfs_item items[];
160 } __attribute__ ((__packed__));
163 * all non-leaf blocks are nodes, they hold only keys and pointers to
166 struct btrfs_key_ptr {
167 struct btrfs_disk_key key;
169 } __attribute__ ((__packed__));
172 struct btrfs_header header;
173 struct btrfs_key_ptr ptrs[];
174 } __attribute__ ((__packed__));
177 * btrfs_paths remember the path taken from the root down to the leaf.
178 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
179 * to any other levels that are present.
181 * The slots array records the index of the item or block pointer
182 * used while walking the tree.
185 struct extent_buffer *nodes[BTRFS_MAX_LEVEL];
186 int slots[BTRFS_MAX_LEVEL];
192 * items in the extent btree are used to record the objectid of the
193 * owner of the block and the number of references
195 struct btrfs_extent_item {
198 } __attribute__ ((__packed__));
200 struct btrfs_inode_timespec {
203 } __attribute__ ((__packed__));
206 * there is no padding here on purpose. If you want to extent the inode,
207 * make a new item type
209 struct btrfs_inode_item {
221 struct btrfs_inode_timespec atime;
222 struct btrfs_inode_timespec ctime;
223 struct btrfs_inode_timespec mtime;
224 struct btrfs_inode_timespec otime;
225 } __attribute__ ((__packed__));
227 struct btrfs_dir_item {
228 struct btrfs_disk_key location;
232 } __attribute__ ((__packed__));
234 struct btrfs_root_item {
235 struct btrfs_inode_item inode;
242 struct btrfs_disk_key drop_progress;
245 } __attribute__ ((__packed__));
247 #define BTRFS_FILE_EXTENT_REG 0
248 #define BTRFS_FILE_EXTENT_INLINE 1
250 struct btrfs_file_extent_item {
254 * disk space consumed by the extent, checksum blocks are included
258 __le64 disk_num_bytes;
260 * the logical offset in file blocks (no csums)
261 * this extent record is for. This allows a file extent to point
262 * into the middle of an existing extent on disk, sharing it
263 * between two snapshots (useful if some bytes in the middle of the
264 * extent have changed
268 * the logical number of file blocks (no csums included)
271 } __attribute__ ((__packed__));
273 struct btrfs_csum_item {
275 } __attribute__ ((__packed__));
277 /* tag for the radix tree of block groups in ram */
278 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
281 #define BTRFS_BLOCK_GROUP_DATA 1
282 #define BTRFS_BLOCK_GROUP_MIXED 2
284 struct btrfs_block_group_item {
287 } __attribute__ ((__packed__));
289 struct btrfs_block_group_cache {
290 struct btrfs_key key;
291 struct btrfs_block_group_item item;
296 struct btrfs_fs_info {
297 u8 fsid[BTRFS_FSID_SIZE];
298 struct btrfs_root *extent_root;
299 struct btrfs_root *tree_root;
300 struct radix_tree_root fs_roots_radix;
302 struct extent_map_tree free_space_cache;
303 struct extent_map_tree block_group_cache;
304 struct extent_map_tree pinned_extents;
305 struct extent_map_tree pending_del;
306 struct extent_map_tree extent_ins;
309 u64 last_trans_committed;
310 struct btrfs_transaction *running_transaction;
311 struct btrfs_super_block super_copy;
312 struct extent_buffer *sb_buffer;
313 struct super_block *sb;
314 struct inode *btree_inode;
315 spinlock_t hash_lock;
316 struct mutex trans_mutex;
317 struct mutex fs_mutex;
318 struct list_head trans_list;
319 struct list_head hashers;
320 struct list_head dead_roots;
321 struct delayed_work trans_work;
322 struct kobject super_kobj;
323 struct completion kobj_unregister;
329 * in ram representation of the tree. extent_root is used for all allocations
330 * and for the extent tree extent_root root.
333 struct extent_buffer *node;
334 struct extent_buffer *commit_root;
335 struct btrfs_root_item root_item;
336 struct btrfs_key root_key;
337 struct btrfs_fs_info *fs_info;
339 struct kobject root_kobj;
340 struct completion kobj_unregister;
341 struct rw_semaphore snap_sem;
345 /* data allocations are done in sectorsize units */
348 /* node allocations are done in nodesize units */
351 /* leaf allocations are done in leafsize units */
356 u64 last_inode_alloc;
358 struct btrfs_key defrag_progress;
365 * inode items have the data typically returned from stat and store other
366 * info about object characteristics. There is one for every file and dir in
369 #define BTRFS_INODE_ITEM_KEY 1
371 /* reserve 2-15 close to the inode for later flexibility */
374 * dir items are the name -> inode pointers in a directory. There is one
375 * for every name in a directory.
377 #define BTRFS_DIR_ITEM_KEY 16
378 #define BTRFS_DIR_INDEX_KEY 17
380 * extent data is for file data
382 #define BTRFS_EXTENT_DATA_KEY 18
384 * csum items have the checksums for data in the extents
386 #define BTRFS_CSUM_ITEM_KEY 19
388 /* reserve 20-31 for other file stuff */
391 * root items point to tree roots. There are typically in the root
392 * tree used by the super block to find all the other trees
394 #define BTRFS_ROOT_ITEM_KEY 32
396 * extent items are in the extent map tree. These record which blocks
397 * are used, and how many references there are to each block
399 #define BTRFS_EXTENT_ITEM_KEY 33
402 * block groups give us hints into the extent allocation trees. Which
403 * blocks are free etc etc
405 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
408 * string items are for debugging. They just store a short string of
411 #define BTRFS_STRING_ITEM_KEY 253
413 /* some macros to generate set/get funcs for the struct fields. This
414 * assumes there is a lefoo_to_cpu for every type, so lets make a simple
417 #define le8_to_cpu(v) (v)
418 #define cpu_to_le8(v) (v)
421 #define read_eb_member(eb, ptr, type, member, result) ( \
422 read_extent_buffer(eb, (char *)(result), \
423 ((unsigned long)(ptr)) + \
424 offsetof(type, member), \
425 sizeof(((type *)0)->member)))
427 #define write_eb_member(eb, ptr, type, member, result) ( \
428 write_extent_buffer(eb, (char *)(result), \
429 ((unsigned long)(ptr)) + \
430 offsetof(type, member), \
431 sizeof(((type *)0)->member)))
433 #ifndef BTRFS_SETGET_FUNCS
434 #define BTRFS_SETGET_FUNCS(name, type, member, bits) \
435 u##bits btrfs_##name(struct extent_buffer *eb, type *s); \
436 void btrfs_set_##name(struct extent_buffer *eb, type *s, u##bits val);
439 #define BTRFS_SETGET_HEADER_FUNCS(name, type, member, bits) \
440 static inline u##bits btrfs_##name(struct extent_buffer *eb) \
442 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
443 unsigned long offset = offsetof(type, member); \
445 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
446 res = le##bits##_to_cpu(*tmp); \
447 kunmap_atomic(kaddr, KM_USER0); \
450 static inline void btrfs_set_##name(struct extent_buffer *eb, \
453 char *kaddr = kmap_atomic(eb->first_page, KM_USER0); \
454 unsigned long offset = offsetof(type, member); \
455 __le##bits *tmp = (__le##bits *)(kaddr + offset); \
456 *tmp = cpu_to_le##bits(val); \
457 kunmap_atomic(kaddr, KM_USER0); \
460 #define BTRFS_SETGET_STACK_FUNCS(name, type, member, bits) \
461 static inline u##bits btrfs_##name(type *s) \
463 return le##bits##_to_cpu(s->member); \
465 static inline void btrfs_set_##name(type *s, u##bits val) \
467 s->member = cpu_to_le##bits(val); \
470 /* struct btrfs_block_group_item */
471 BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
473 BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
476 /* struct btrfs_inode_item */
477 BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
478 BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
479 BTRFS_SETGET_FUNCS(inode_nblocks, struct btrfs_inode_item, nblocks, 64);
480 BTRFS_SETGET_FUNCS(inode_block_group, struct btrfs_inode_item, block_group, 64);
481 BTRFS_SETGET_FUNCS(inode_nlink, struct btrfs_inode_item, nlink, 32);
482 BTRFS_SETGET_FUNCS(inode_uid, struct btrfs_inode_item, uid, 32);
483 BTRFS_SETGET_FUNCS(inode_gid, struct btrfs_inode_item, gid, 32);
484 BTRFS_SETGET_FUNCS(inode_mode, struct btrfs_inode_item, mode, 32);
485 BTRFS_SETGET_FUNCS(inode_rdev, struct btrfs_inode_item, rdev, 32);
486 BTRFS_SETGET_FUNCS(inode_flags, struct btrfs_inode_item, flags, 16);
487 BTRFS_SETGET_FUNCS(inode_compat_flags, struct btrfs_inode_item,
490 static inline struct btrfs_inode_timespec *
491 btrfs_inode_atime(struct btrfs_inode_item *inode_item)
493 unsigned long ptr = (unsigned long)inode_item;
494 ptr += offsetof(struct btrfs_inode_item, atime);
495 return (struct btrfs_inode_timespec *)ptr;
498 static inline struct btrfs_inode_timespec *
499 btrfs_inode_mtime(struct btrfs_inode_item *inode_item)
501 unsigned long ptr = (unsigned long)inode_item;
502 ptr += offsetof(struct btrfs_inode_item, mtime);
503 return (struct btrfs_inode_timespec *)ptr;
506 static inline struct btrfs_inode_timespec *
507 btrfs_inode_ctime(struct btrfs_inode_item *inode_item)
509 unsigned long ptr = (unsigned long)inode_item;
510 ptr += offsetof(struct btrfs_inode_item, ctime);
511 return (struct btrfs_inode_timespec *)ptr;
514 static inline struct btrfs_inode_timespec *
515 btrfs_inode_otime(struct btrfs_inode_item *inode_item)
517 unsigned long ptr = (unsigned long)inode_item;
518 ptr += offsetof(struct btrfs_inode_item, otime);
519 return (struct btrfs_inode_timespec *)ptr;
522 BTRFS_SETGET_FUNCS(timespec_sec, struct btrfs_inode_timespec, sec, 64);
523 BTRFS_SETGET_FUNCS(timespec_nsec, struct btrfs_inode_timespec, nsec, 32);
525 /* struct btrfs_extent_item */
526 BTRFS_SETGET_FUNCS(extent_refs, struct btrfs_extent_item, refs, 32);
527 BTRFS_SETGET_FUNCS(extent_owner, struct btrfs_extent_item, owner, 64);
529 BTRFS_SETGET_STACK_FUNCS(stack_extent_refs, struct btrfs_extent_item,
531 BTRFS_SETGET_STACK_FUNCS(stack_extent_owner, struct btrfs_extent_item,
534 /* struct btrfs_node */
535 BTRFS_SETGET_FUNCS(key_blockptr, struct btrfs_key_ptr, blockptr, 64);
537 static inline u64 btrfs_node_blockptr(struct extent_buffer *eb, int nr)
540 ptr = offsetof(struct btrfs_node, ptrs) +
541 sizeof(struct btrfs_key_ptr) * nr;
542 return btrfs_key_blockptr(eb, (struct btrfs_key_ptr *)ptr);
545 static inline void btrfs_set_node_blockptr(struct extent_buffer *eb,
549 ptr = offsetof(struct btrfs_node, ptrs) +
550 sizeof(struct btrfs_key_ptr) * nr;
551 btrfs_set_key_blockptr(eb, (struct btrfs_key_ptr *)ptr, val);
554 static inline unsigned long btrfs_node_key_ptr_offset(int nr)
556 return offsetof(struct btrfs_node, ptrs) +
557 sizeof(struct btrfs_key_ptr) * nr;
560 static inline void btrfs_node_key(struct extent_buffer *eb,
561 struct btrfs_disk_key *disk_key, int nr)
564 ptr = btrfs_node_key_ptr_offset(nr);
565 read_eb_member(eb, (struct btrfs_key_ptr *)ptr,
566 struct btrfs_key_ptr, key, disk_key);
568 static inline void btrfs_set_node_key(struct extent_buffer *eb,
569 struct btrfs_disk_key *disk_key, int nr)
572 ptr = btrfs_node_key_ptr_offset(nr);
573 write_eb_member(eb, (struct btrfs_key_ptr *)ptr,
574 struct btrfs_key_ptr, key, disk_key);
577 /* struct btrfs_item */
578 BTRFS_SETGET_FUNCS(item_offset, struct btrfs_item, offset, 32);
579 BTRFS_SETGET_FUNCS(item_size, struct btrfs_item, size, 32);
581 static inline unsigned long btrfs_item_nr_offset(int nr)
583 return offsetof(struct btrfs_leaf, items) +
584 sizeof(struct btrfs_item) * nr;
587 static inline struct btrfs_item *btrfs_item_nr(struct extent_buffer *eb,
590 return (struct btrfs_item *)btrfs_item_nr_offset(nr);
593 static inline u32 btrfs_item_end(struct extent_buffer *eb,
594 struct btrfs_item *item)
596 return btrfs_item_offset(eb, item) + btrfs_item_size(eb, item);
599 static inline u32 btrfs_item_end_nr(struct extent_buffer *eb, int nr)
601 return btrfs_item_end(eb, btrfs_item_nr(eb, nr));
604 static inline u32 btrfs_item_offset_nr(struct extent_buffer *eb, int nr)
606 return btrfs_item_offset(eb, btrfs_item_nr(eb, nr));
609 static inline u32 btrfs_item_size_nr(struct extent_buffer *eb, int nr)
611 return btrfs_item_size(eb, btrfs_item_nr(eb, nr));
614 static inline void btrfs_item_key(struct extent_buffer *eb,
615 struct btrfs_disk_key *disk_key, int nr)
617 struct btrfs_item *item = btrfs_item_nr(eb, nr);
618 read_eb_member(eb, item, struct btrfs_item, key, disk_key);
621 static inline void btrfs_set_item_key(struct extent_buffer *eb,
622 struct btrfs_disk_key *disk_key, int nr)
624 struct btrfs_item *item = btrfs_item_nr(eb, nr);
625 write_eb_member(eb, item, struct btrfs_item, key, disk_key);
628 /* struct btrfs_dir_item */
629 BTRFS_SETGET_FUNCS(dir_flags, struct btrfs_dir_item, flags, 16);
630 BTRFS_SETGET_FUNCS(dir_type, struct btrfs_dir_item, type, 8);
631 BTRFS_SETGET_FUNCS(dir_name_len, struct btrfs_dir_item, name_len, 16);
633 static inline void btrfs_dir_item_key(struct extent_buffer *eb,
634 struct btrfs_dir_item *item,
635 struct btrfs_disk_key *key)
637 read_eb_member(eb, item, struct btrfs_dir_item, location, key);
640 static inline void btrfs_set_dir_item_key(struct extent_buffer *eb,
641 struct btrfs_dir_item *item,
642 struct btrfs_disk_key *key)
644 write_eb_member(eb, item, struct btrfs_dir_item, location, key);
647 /* struct btrfs_disk_key */
648 BTRFS_SETGET_STACK_FUNCS(disk_key_objectid, struct btrfs_disk_key,
650 BTRFS_SETGET_STACK_FUNCS(disk_key_offset, struct btrfs_disk_key, offset, 64);
651 BTRFS_SETGET_STACK_FUNCS(disk_key_type, struct btrfs_disk_key, type, 8);
653 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
654 struct btrfs_disk_key *disk)
656 cpu->offset = le64_to_cpu(disk->offset);
657 cpu->type = disk->type;
658 cpu->objectid = le64_to_cpu(disk->objectid);
661 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
662 struct btrfs_key *cpu)
664 disk->offset = cpu_to_le64(cpu->offset);
665 disk->type = cpu->type;
666 disk->objectid = cpu_to_le64(cpu->objectid);
669 static inline void btrfs_node_key_to_cpu(struct extent_buffer *eb,
670 struct btrfs_key *key, int nr)
672 struct btrfs_disk_key disk_key;
673 btrfs_node_key(eb, &disk_key, nr);
674 btrfs_disk_key_to_cpu(key, &disk_key);
677 static inline void btrfs_item_key_to_cpu(struct extent_buffer *eb,
678 struct btrfs_key *key, int nr)
680 struct btrfs_disk_key disk_key;
681 btrfs_item_key(eb, &disk_key, nr);
682 btrfs_disk_key_to_cpu(key, &disk_key);
685 static inline void btrfs_dir_item_key_to_cpu(struct extent_buffer *eb,
686 struct btrfs_dir_item *item,
687 struct btrfs_key *key)
689 struct btrfs_disk_key disk_key;
690 btrfs_dir_item_key(eb, item, &disk_key);
691 btrfs_disk_key_to_cpu(key, &disk_key);
695 static inline u8 btrfs_key_type(struct btrfs_key *key)
700 static inline void btrfs_set_key_type(struct btrfs_key *key, u8 val)
705 /* struct btrfs_header */
706 BTRFS_SETGET_HEADER_FUNCS(header_bytenr, struct btrfs_header, bytenr, 64);
707 BTRFS_SETGET_HEADER_FUNCS(header_generation, struct btrfs_header,
709 BTRFS_SETGET_HEADER_FUNCS(header_owner, struct btrfs_header, owner, 64);
710 BTRFS_SETGET_HEADER_FUNCS(header_nritems, struct btrfs_header, nritems, 32);
711 BTRFS_SETGET_HEADER_FUNCS(header_flags, struct btrfs_header, flags, 16);
712 BTRFS_SETGET_HEADER_FUNCS(header_level, struct btrfs_header, level, 8);
714 static inline u8 *btrfs_header_fsid(struct extent_buffer *eb)
716 unsigned long ptr = offsetof(struct btrfs_header, fsid);
720 static inline u8 *btrfs_super_fsid(struct extent_buffer *eb)
722 unsigned long ptr = offsetof(struct btrfs_super_block, fsid);
726 static inline u8 *btrfs_header_csum(struct extent_buffer *eb)
728 unsigned long ptr = offsetof(struct btrfs_header, csum);
732 static inline struct btrfs_node *btrfs_buffer_node(struct extent_buffer *eb)
737 static inline struct btrfs_leaf *btrfs_buffer_leaf(struct extent_buffer *eb)
742 static inline struct btrfs_header *btrfs_buffer_header(struct extent_buffer *eb)
747 static inline int btrfs_is_leaf(struct extent_buffer *eb)
749 return (btrfs_header_level(eb) == 0);
752 /* struct btrfs_root_item */
753 BTRFS_SETGET_FUNCS(disk_root_refs, struct btrfs_root_item, refs, 32);
754 BTRFS_SETGET_FUNCS(disk_root_bytenr, struct btrfs_root_item, bytenr, 64);
755 BTRFS_SETGET_FUNCS(disk_root_level, struct btrfs_root_item, level, 8);
757 BTRFS_SETGET_STACK_FUNCS(root_bytenr, struct btrfs_root_item, bytenr, 64);
758 BTRFS_SETGET_STACK_FUNCS(root_level, struct btrfs_root_item, level, 8);
759 BTRFS_SETGET_STACK_FUNCS(root_dirid, struct btrfs_root_item, root_dirid, 64);
760 BTRFS_SETGET_STACK_FUNCS(root_refs, struct btrfs_root_item, refs, 32);
761 BTRFS_SETGET_STACK_FUNCS(root_flags, struct btrfs_root_item, flags, 32);
762 BTRFS_SETGET_STACK_FUNCS(root_used, struct btrfs_root_item, bytes_used, 64);
763 BTRFS_SETGET_STACK_FUNCS(root_limit, struct btrfs_root_item, byte_limit, 64);
765 /* struct btrfs_super_block */
766 BTRFS_SETGET_STACK_FUNCS(super_bytenr, struct btrfs_super_block, bytenr, 64);
767 BTRFS_SETGET_STACK_FUNCS(super_generation, struct btrfs_super_block,
769 BTRFS_SETGET_STACK_FUNCS(super_root, struct btrfs_super_block, root, 64);
770 BTRFS_SETGET_STACK_FUNCS(super_root_level, struct btrfs_super_block,
772 BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
774 BTRFS_SETGET_STACK_FUNCS(super_bytes_used, struct btrfs_super_block,
776 BTRFS_SETGET_STACK_FUNCS(super_sectorsize, struct btrfs_super_block,
778 BTRFS_SETGET_STACK_FUNCS(super_nodesize, struct btrfs_super_block,
780 BTRFS_SETGET_STACK_FUNCS(super_leafsize, struct btrfs_super_block,
782 BTRFS_SETGET_STACK_FUNCS(super_root_dir, struct btrfs_super_block,
783 root_dir_objectid, 64);
785 static inline unsigned long btrfs_leaf_data(struct extent_buffer *l)
787 return offsetof(struct btrfs_leaf, items);
790 /* struct btrfs_file_extent_item */
791 BTRFS_SETGET_FUNCS(file_extent_type, struct btrfs_file_extent_item, type, 8);
793 static inline unsigned long btrfs_file_extent_inline_start(struct
794 btrfs_file_extent_item *e)
796 unsigned long offset = (unsigned long)e;
797 offset += offsetof(struct btrfs_file_extent_item, disk_bytenr);
801 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
803 return offsetof(struct btrfs_file_extent_item, disk_bytenr) + datasize;
806 static inline u32 btrfs_file_extent_inline_len(struct extent_buffer *eb,
807 struct btrfs_item *e)
809 unsigned long offset;
810 offset = offsetof(struct btrfs_file_extent_item, disk_bytenr);
811 return btrfs_item_size(eb, e) - offset;
814 BTRFS_SETGET_FUNCS(file_extent_disk_bytenr, struct btrfs_file_extent_item,
816 BTRFS_SETGET_FUNCS(file_extent_generation, struct btrfs_file_extent_item,
818 BTRFS_SETGET_FUNCS(file_extent_disk_num_bytes, struct btrfs_file_extent_item,
820 BTRFS_SETGET_FUNCS(file_extent_offset, struct btrfs_file_extent_item,
822 BTRFS_SETGET_FUNCS(file_extent_num_bytes, struct btrfs_file_extent_item,
825 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
827 return sb->s_fs_info;
830 static inline int btrfs_set_root_name(struct btrfs_root *root,
831 const char *name, int len)
833 /* if we already have a name just free it */
837 root->name = kmalloc(len+1, GFP_KERNEL);
841 memcpy(root->name, name, len);
842 root->name[len] ='\0';
847 static inline u32 btrfs_level_size(struct btrfs_root *root, int level) {
849 return root->leafsize;
850 return root->nodesize;
853 /* helper function to cast into the data area of the leaf. */
854 #define btrfs_item_ptr(leaf, slot, type) \
855 ((type *)(btrfs_leaf_data(leaf) + \
856 btrfs_item_offset_nr(leaf, slot)))
858 #define btrfs_item_ptr_offset(leaf, slot) \
859 ((unsigned long)(btrfs_leaf_data(leaf) + \
860 btrfs_item_offset_nr(leaf, slot)))
862 /* mount option defines and helpers */
863 #define BTRFS_MOUNT_SUBVOL 0x000001
864 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
865 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
866 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
869 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
870 struct btrfs_root *root);
871 int btrfs_copy_pinned(struct btrfs_root *root, struct extent_map_tree *copy);
872 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
875 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
876 struct btrfs_block_group_cache
877 *hint, u64 search_start,
878 int data, int owner);
879 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
880 struct btrfs_root *root);
881 struct extent_buffer *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
882 struct btrfs_root *root, u32 size,
883 u64 hint, u64 empty_size);
884 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
885 struct btrfs_root *root, u64 owner,
886 u64 num_bytes, u64 empty_size, u64 search_start,
887 u64 search_end, struct btrfs_key *ins, int data);
888 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
889 struct extent_buffer *buf);
890 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
891 *root, u64 bytenr, u64 num_bytes, int pin);
892 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
893 struct btrfs_root *root,
894 struct extent_map_tree *unpin);
895 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
896 struct btrfs_root *root,
897 u64 bytenr, u64 num_bytes);
898 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
899 struct btrfs_root *root);
900 int btrfs_free_block_groups(struct btrfs_fs_info *info);
901 int btrfs_read_block_groups(struct btrfs_root *root);
903 int btrfs_cow_block(struct btrfs_trans_handle *trans,
904 struct btrfs_root *root, struct extent_buffer *buf,
905 struct extent_buffer *parent, int parent_slot,
906 struct extent_buffer **cow_ret);
907 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
908 *root, struct btrfs_path *path, u32 data_size);
909 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
910 struct btrfs_root *root,
911 struct btrfs_path *path,
912 u32 new_size, int from_end);
913 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
914 *root, struct btrfs_key *key, struct btrfs_path *p, int
916 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
917 struct btrfs_root *root, struct extent_buffer *parent,
918 int start_slot, int cache_only, u64 *last_ret,
919 struct btrfs_key *progress);
920 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
921 struct btrfs_path *btrfs_alloc_path(void);
922 void btrfs_free_path(struct btrfs_path *p);
923 void btrfs_init_path(struct btrfs_path *p);
924 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
925 struct btrfs_path *path);
926 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
927 *root, struct btrfs_key *key, void *data, u32 data_size);
928 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
929 *root, struct btrfs_path *path, struct btrfs_key
930 *cpu_key, u32 data_size);
931 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
932 int btrfs_leaf_free_space(struct btrfs_root *root, struct extent_buffer *leaf);
933 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
936 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
937 struct btrfs_key *key);
938 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
939 *root, struct btrfs_key *key, struct btrfs_root_item
941 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
942 *root, struct btrfs_key *key, struct btrfs_root_item
944 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
945 btrfs_root_item *item, struct btrfs_key *key);
946 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
947 struct btrfs_root *latest_root);
949 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
950 *root, const char *name, int name_len, u64 dir,
951 struct btrfs_key *location, u8 type);
952 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
953 struct btrfs_root *root,
954 struct btrfs_path *path, u64 dir,
955 const char *name, int name_len,
957 struct btrfs_dir_item *
958 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
959 struct btrfs_root *root,
960 struct btrfs_path *path, u64 dir,
961 u64 objectid, const char *name, int name_len,
963 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
964 struct btrfs_path *path,
965 const char *name, int name_len);
966 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
967 struct btrfs_root *root,
968 struct btrfs_path *path,
969 struct btrfs_dir_item *di);
971 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
972 struct btrfs_root *fs_root,
973 u64 dirid, u64 *objectid);
974 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
977 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
978 struct btrfs_root *root,
979 struct btrfs_path *path, u64 objectid);
980 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
981 *root, struct btrfs_path *path,
982 struct btrfs_key *location, int mod);
985 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
986 struct btrfs_root *root,
987 u64 objectid, u64 pos, u64 offset,
990 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
991 struct btrfs_root *root,
992 struct btrfs_path *path, u64 objectid,
993 u64 bytenr, int mod);
994 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
995 struct btrfs_root *root,
997 u64 objectid, u64 offset,
998 char *data, size_t len);
999 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1000 struct btrfs_root *root,
1001 struct btrfs_path *path,
1002 u64 objectid, u64 offset,
1004 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1005 struct btrfs_root *root, struct btrfs_path *path,
1008 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1009 int btrfs_readpage(struct file *file, struct page *page);
1010 void btrfs_delete_inode(struct inode *inode);
1011 void btrfs_read_locked_inode(struct inode *inode);
1012 int btrfs_write_inode(struct inode *inode, int wait);
1013 void btrfs_dirty_inode(struct inode *inode);
1014 struct inode *btrfs_alloc_inode(struct super_block *sb);
1015 void btrfs_destroy_inode(struct inode *inode);
1016 int btrfs_init_cachep(void);
1017 void btrfs_destroy_cachep(void);
1018 long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
1019 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1020 struct btrfs_root *root);
1021 int btrfs_commit_write(struct file *file, struct page *page,
1022 unsigned from, unsigned to);
1023 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1024 size_t page_offset, u64 start, u64 end,
1026 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1027 struct btrfs_root *root,
1028 struct inode *inode);
1030 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1031 extern struct file_operations btrfs_file_operations;
1032 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1033 struct btrfs_root *root, struct inode *inode,
1034 u64 start, u64 end, u64 inline_end, u64 *hint_block);
1036 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1037 struct btrfs_root *root, int cache_only);
1040 int btrfs_init_sysfs(void);
1041 void btrfs_exit_sysfs(void);
1042 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1043 int btrfs_sysfs_add_root(struct btrfs_root *root);
1044 void btrfs_sysfs_del_root(struct btrfs_root *root);
1045 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);