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/buffer_head.h>
24 #include <linux/workqueue.h>
25 #include <linux/completion.h>
26 #include "bit-radix.h"
28 struct btrfs_trans_handle;
29 struct btrfs_transaction;
30 extern struct kmem_cache *btrfs_trans_handle_cachep;
31 extern struct kmem_cache *btrfs_transaction_cachep;
32 extern struct kmem_cache *btrfs_bit_radix_cachep;
33 extern struct kmem_cache *btrfs_path_cachep;
35 #define BTRFS_MAGIC "_BtRfS_M"
37 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
38 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
39 #define BTRFS_FS_TREE_OBJECTID 3ULL
40 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
41 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
44 * we can actually store much bigger names, but lets not confuse the rest
47 #define BTRFS_NAME_LEN 255
49 /* 32 bytes in various csum fields */
50 #define BTRFS_CSUM_SIZE 32
51 /* four bytes for CRC32 */
52 #define BTRFS_CRC32_SIZE 4
53 #define BTRFS_EMPTY_DIR_SIZE 6
55 #define BTRFS_FT_UNKNOWN 0
56 #define BTRFS_FT_REG_FILE 1
57 #define BTRFS_FT_DIR 2
58 #define BTRFS_FT_CHRDEV 3
59 #define BTRFS_FT_BLKDEV 4
60 #define BTRFS_FT_FIFO 5
61 #define BTRFS_FT_SOCK 6
62 #define BTRFS_FT_SYMLINK 7
63 #define BTRFS_FT_MAX 8
66 * the key defines the order in the tree, and so it also defines (optimal)
67 * block layout. objectid corresonds to the inode number. The flags
68 * tells us things about the object, and is a kind of stream selector.
69 * so for a given inode, keys with flags of 1 might refer to the inode
70 * data, flags of 2 may point to file data in the btree and flags == 3
71 * may point to extents.
73 * offset is the starting byte offset for this key in the stream.
75 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
76 * in cpu native order. Otherwise they are identical and their sizes
77 * should be the same (ie both packed)
79 struct btrfs_disk_key {
83 } __attribute__ ((__packed__));
89 } __attribute__ ((__packed__));
92 * every tree block (leaf or node) starts with this header.
95 u8 csum[BTRFS_CSUM_SIZE];
96 u8 fsid[16]; /* FS specific uuid */
97 __le64 blocknr; /* which block this node is supposed to live in */
103 } __attribute__ ((__packed__));
105 #define BTRFS_MAX_LEVEL 8
106 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
107 sizeof(struct btrfs_header)) / \
108 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
109 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
110 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
111 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
112 sizeof(struct btrfs_item) - \
113 sizeof(struct btrfs_file_extent_item))
117 * the super block basically lists the main trees of the FS
118 * it currently lacks any block count etc etc
120 struct btrfs_super_block {
121 u8 csum[BTRFS_CSUM_SIZE];
122 /* the first 3 fields must match struct btrfs_header */
123 u8 fsid[16]; /* FS specific uuid */
124 __le64 blocknr; /* this block number */
130 __le64 root_dir_objectid;
132 } __attribute__ ((__packed__));
135 * A leaf is full of items. offset and size tell us where to find
136 * the item in the leaf (relative to the start of the data area)
139 struct btrfs_disk_key key;
142 } __attribute__ ((__packed__));
145 * leaves have an item area and a data area:
146 * [item0, item1....itemN] [free space] [dataN...data1, data0]
148 * The data is separate from the items to get the keys closer together
152 struct btrfs_header header;
153 struct btrfs_item items[];
154 } __attribute__ ((__packed__));
157 * all non-leaf blocks are nodes, they hold only keys and pointers to
160 struct btrfs_key_ptr {
161 struct btrfs_disk_key key;
163 } __attribute__ ((__packed__));
166 struct btrfs_header header;
167 struct btrfs_key_ptr ptrs[];
168 } __attribute__ ((__packed__));
171 * btrfs_paths remember the path taken from the root down to the leaf.
172 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
173 * to any other levels that are present.
175 * The slots array records the index of the item or block pointer
176 * used while walking the tree.
179 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
180 int slots[BTRFS_MAX_LEVEL];
186 * items in the extent btree are used to record the objectid of the
187 * owner of the block and the number of references
189 struct btrfs_extent_item {
192 } __attribute__ ((__packed__));
194 struct btrfs_inode_timespec {
197 } __attribute__ ((__packed__));
200 * there is no padding here on purpose. If you want to extent the inode,
201 * make a new item type
203 struct btrfs_inode_item {
215 struct btrfs_inode_timespec atime;
216 struct btrfs_inode_timespec ctime;
217 struct btrfs_inode_timespec mtime;
218 struct btrfs_inode_timespec otime;
219 } __attribute__ ((__packed__));
221 struct btrfs_dir_item {
222 struct btrfs_disk_key location;
226 } __attribute__ ((__packed__));
228 struct btrfs_root_item {
229 struct btrfs_inode_item inode;
236 struct btrfs_disk_key drop_progress;
238 } __attribute__ ((__packed__));
240 #define BTRFS_FILE_EXTENT_REG 0
241 #define BTRFS_FILE_EXTENT_INLINE 1
243 struct btrfs_file_extent_item {
247 * disk space consumed by the extent, checksum blocks are included
251 __le64 disk_num_blocks;
253 * the logical offset in file blocks (no csums)
254 * this extent record is for. This allows a file extent to point
255 * into the middle of an existing extent on disk, sharing it
256 * between two snapshots (useful if some bytes in the middle of the
257 * extent have changed
261 * the logical number of file blocks (no csums included)
264 } __attribute__ ((__packed__));
266 struct btrfs_csum_item {
268 } __attribute__ ((__packed__));
270 /* tag for the radix tree of block groups in ram */
271 #define BTRFS_BLOCK_GROUP_DIRTY 0
272 #define BTRFS_BLOCK_GROUP_AVAIL 1
273 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
276 #define BTRFS_BLOCK_GROUP_DATA 1
277 struct btrfs_block_group_item {
280 } __attribute__ ((__packed__));
282 struct btrfs_block_group_cache {
283 struct btrfs_key key;
284 struct btrfs_block_group_item item;
285 struct radix_tree_root *radix;
294 struct btrfs_fs_info {
295 struct btrfs_root *extent_root;
296 struct btrfs_root *tree_root;
297 struct radix_tree_root fs_roots_radix;
298 struct radix_tree_root pending_del_radix;
299 struct radix_tree_root pinned_radix;
300 struct radix_tree_root block_group_radix;
301 struct radix_tree_root block_group_data_radix;
302 struct radix_tree_root extent_map_radix;
303 struct radix_tree_root extent_ins_radix;
305 u64 last_trans_committed;
306 struct btrfs_transaction *running_transaction;
307 struct btrfs_super_block *disk_super;
308 struct btrfs_super_block super_copy;
309 struct buffer_head *sb_buffer;
310 struct super_block *sb;
311 struct inode *btree_inode;
312 struct mutex trans_mutex;
313 struct mutex fs_mutex;
314 struct list_head trans_list;
315 struct list_head dead_roots;
316 struct delayed_work trans_work;
317 struct kobject super_kobj;
318 struct completion kobj_unregister;
324 * in ram representation of the tree. extent_root is used for all allocations
325 * and for the extent tree extent_root root.
328 struct buffer_head *node;
329 struct buffer_head *commit_root;
330 struct btrfs_root_item root_item;
331 struct btrfs_key root_key;
332 struct btrfs_fs_info *fs_info;
334 struct kobject root_kobj;
335 struct completion kobj_unregister;
336 struct rw_semaphore snap_sem;
342 u64 last_inode_alloc;
344 struct btrfs_key defrag_progress;
350 /* the lower bits in the key flags defines the item type */
351 #define BTRFS_KEY_TYPE_MAX 256
352 #define BTRFS_KEY_TYPE_SHIFT 24
353 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
354 BTRFS_KEY_TYPE_SHIFT)
357 * inode items have the data typically returned from stat and store other
358 * info about object characteristics. There is one for every file and dir in
361 #define BTRFS_INODE_ITEM_KEY 1
363 /* reserve 2-15 close to the inode for later flexibility */
366 * dir items are the name -> inode pointers in a directory. There is one
367 * for every name in a directory.
369 #define BTRFS_DIR_ITEM_KEY 16
370 #define BTRFS_DIR_INDEX_KEY 17
372 * extent data is for file data
374 #define BTRFS_EXTENT_DATA_KEY 18
376 * csum items have the checksums for data in the extents
378 #define BTRFS_CSUM_ITEM_KEY 19
380 /* reserve 20-31 for other file stuff */
383 * root items point to tree roots. There are typically in the root
384 * tree used by the super block to find all the other trees
386 #define BTRFS_ROOT_ITEM_KEY 32
388 * extent items are in the extent map tree. These record which blocks
389 * are used, and how many references there are to each block
391 #define BTRFS_EXTENT_ITEM_KEY 33
394 * block groups give us hints into the extent allocation trees. Which
395 * blocks are free etc etc
397 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
400 * string items are for debugging. They just store a short string of
403 #define BTRFS_STRING_ITEM_KEY 253
406 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
408 return le64_to_cpu(bi->used);
411 static inline void btrfs_set_block_group_used(struct
412 btrfs_block_group_item *bi,
415 bi->used = cpu_to_le64(val);
418 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
420 return le64_to_cpu(i->generation);
423 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
426 i->generation = cpu_to_le64(val);
429 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
431 return le64_to_cpu(i->size);
434 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
436 i->size = cpu_to_le64(val);
439 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
441 return le64_to_cpu(i->nblocks);
444 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
446 i->nblocks = cpu_to_le64(val);
449 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
451 return le64_to_cpu(i->block_group);
454 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
457 i->block_group = cpu_to_le64(val);
460 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
462 return le32_to_cpu(i->nlink);
465 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
467 i->nlink = cpu_to_le32(val);
470 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
472 return le32_to_cpu(i->uid);
475 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
477 i->uid = cpu_to_le32(val);
480 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
482 return le32_to_cpu(i->gid);
485 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
487 i->gid = cpu_to_le32(val);
490 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
492 return le32_to_cpu(i->mode);
495 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
497 i->mode = cpu_to_le32(val);
500 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
502 return le32_to_cpu(i->rdev);
505 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
507 i->rdev = cpu_to_le32(val);
510 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
512 return le16_to_cpu(i->flags);
515 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
517 i->flags = cpu_to_le16(val);
520 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
522 return le16_to_cpu(i->compat_flags);
525 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
528 i->compat_flags = cpu_to_le16(val);
531 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
533 return le64_to_cpu(ts->sec);
536 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
539 ts->sec = cpu_to_le64(val);
542 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
544 return le32_to_cpu(ts->nsec);
547 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
550 ts->nsec = cpu_to_le32(val);
553 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
555 return le32_to_cpu(ei->refs);
558 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
560 ei->refs = cpu_to_le32(val);
563 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
565 return le64_to_cpu(ei->owner);
568 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
570 ei->owner = cpu_to_le64(val);
573 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
575 return le64_to_cpu(n->ptrs[nr].blockptr);
579 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
582 n->ptrs[nr].blockptr = cpu_to_le64(val);
585 static inline u32 btrfs_item_offset(struct btrfs_item *item)
587 return le32_to_cpu(item->offset);
590 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
592 item->offset = cpu_to_le32(val);
595 static inline u32 btrfs_item_end(struct btrfs_item *item)
597 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
600 static inline u16 btrfs_item_size(struct btrfs_item *item)
602 return le16_to_cpu(item->size);
605 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
607 item->size = cpu_to_le16(val);
610 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
612 return le16_to_cpu(d->flags);
615 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
617 d->flags = cpu_to_le16(val);
620 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
625 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
630 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
632 return le16_to_cpu(d->name_len);
635 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
637 d->name_len = cpu_to_le16(val);
640 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
641 struct btrfs_disk_key *disk)
643 cpu->offset = le64_to_cpu(disk->offset);
644 cpu->flags = le32_to_cpu(disk->flags);
645 cpu->objectid = le64_to_cpu(disk->objectid);
648 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
649 struct btrfs_key *cpu)
651 disk->offset = cpu_to_le64(cpu->offset);
652 disk->flags = cpu_to_le32(cpu->flags);
653 disk->objectid = cpu_to_le64(cpu->objectid);
656 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
658 return le64_to_cpu(disk->objectid);
661 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
664 disk->objectid = cpu_to_le64(val);
667 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
669 return le64_to_cpu(disk->offset);
672 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
675 disk->offset = cpu_to_le64(val);
678 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
680 return le32_to_cpu(disk->flags);
683 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
686 disk->flags = cpu_to_le32(val);
689 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
691 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
694 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
697 u32 flags = btrfs_disk_key_flags(key);
698 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
699 val = val << BTRFS_KEY_TYPE_SHIFT;
700 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
701 btrfs_set_disk_key_flags(key, flags);
704 static inline u32 btrfs_key_type(struct btrfs_key *key)
706 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
709 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
711 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
712 val = val << BTRFS_KEY_TYPE_SHIFT;
713 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
716 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
718 return le64_to_cpu(h->blocknr);
721 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
723 h->blocknr = cpu_to_le64(blocknr);
726 static inline u64 btrfs_header_generation(struct btrfs_header *h)
728 return le64_to_cpu(h->generation);
731 static inline void btrfs_set_header_generation(struct btrfs_header *h,
734 h->generation = cpu_to_le64(val);
737 static inline u64 btrfs_header_owner(struct btrfs_header *h)
739 return le64_to_cpu(h->owner);
742 static inline void btrfs_set_header_owner(struct btrfs_header *h,
745 h->owner = cpu_to_le64(val);
748 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
750 return le16_to_cpu(h->nritems);
753 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
755 h->nritems = cpu_to_le16(val);
758 static inline u16 btrfs_header_flags(struct btrfs_header *h)
760 return le16_to_cpu(h->flags);
763 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
765 h->flags = cpu_to_le16(val);
768 static inline int btrfs_header_level(struct btrfs_header *h)
773 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
775 BUG_ON(level > BTRFS_MAX_LEVEL);
779 static inline int btrfs_is_leaf(struct btrfs_node *n)
781 return (btrfs_header_level(&n->header) == 0);
784 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
786 return le64_to_cpu(item->blocknr);
789 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
791 item->blocknr = cpu_to_le64(val);
794 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
796 return le64_to_cpu(item->root_dirid);
799 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
801 item->root_dirid = cpu_to_le64(val);
804 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
806 return le32_to_cpu(item->refs);
809 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
811 item->refs = cpu_to_le32(val);
814 static inline u32 btrfs_root_flags(struct btrfs_root_item *item)
816 return le32_to_cpu(item->flags);
819 static inline void btrfs_set_root_flags(struct btrfs_root_item *item, u32 val)
821 item->flags = cpu_to_le32(val);
824 static inline void btrfs_set_root_blocks_used(struct btrfs_root_item *item,
827 item->blocks_used = cpu_to_le64(val);
830 static inline u64 btrfs_root_blocks_used(struct btrfs_root_item *item)
832 return le64_to_cpu(item->blocks_used);
835 static inline void btrfs_set_root_block_limit(struct btrfs_root_item *item,
838 item->block_limit = cpu_to_le64(val);
841 static inline u64 btrfs_root_block_limit(struct btrfs_root_item *item)
843 return le64_to_cpu(item->block_limit);
846 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
848 return le64_to_cpu(s->blocknr);
851 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
853 s->blocknr = cpu_to_le64(val);
856 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
858 return le64_to_cpu(s->generation);
861 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
864 s->generation = cpu_to_le64(val);
867 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
869 return le64_to_cpu(s->root);
872 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
874 s->root = cpu_to_le64(val);
877 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
879 return le64_to_cpu(s->total_blocks);
882 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
885 s->total_blocks = cpu_to_le64(val);
888 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
890 return le64_to_cpu(s->blocks_used);
893 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
896 s->blocks_used = cpu_to_le64(val);
899 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
901 return le32_to_cpu(s->blocksize);
904 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
907 s->blocksize = cpu_to_le32(val);
910 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
912 return le64_to_cpu(s->root_dir_objectid);
915 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
918 s->root_dir_objectid = cpu_to_le64(val);
921 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
923 return (u8 *)l->items;
926 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
930 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
936 static inline char *btrfs_file_extent_inline_start(struct
937 btrfs_file_extent_item *e)
939 return (char *)(&e->disk_blocknr);
942 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
944 return (unsigned long)(&((struct
945 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
948 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
950 struct btrfs_file_extent_item *fe = NULL;
951 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
954 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
957 return le64_to_cpu(e->disk_blocknr);
960 static inline void btrfs_set_file_extent_disk_blocknr(struct
961 btrfs_file_extent_item
964 e->disk_blocknr = cpu_to_le64(val);
967 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
969 return le64_to_cpu(e->generation);
972 static inline void btrfs_set_file_extent_generation(struct
973 btrfs_file_extent_item *e,
976 e->generation = cpu_to_le64(val);
979 static inline u64 btrfs_file_extent_disk_num_blocks(struct
980 btrfs_file_extent_item *e)
982 return le64_to_cpu(e->disk_num_blocks);
985 static inline void btrfs_set_file_extent_disk_num_blocks(struct
986 btrfs_file_extent_item
989 e->disk_num_blocks = cpu_to_le64(val);
992 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
994 return le64_to_cpu(e->offset);
997 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
1000 e->offset = cpu_to_le64(val);
1003 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
1006 return le64_to_cpu(e->num_blocks);
1009 static inline void btrfs_set_file_extent_num_blocks(struct
1010 btrfs_file_extent_item *e,
1013 e->num_blocks = cpu_to_le64(val);
1016 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
1018 return sb->s_fs_info;
1021 static inline void btrfs_check_bounds(void *vptr, size_t len,
1022 void *vcontainer, size_t container_len)
1025 char *container = vcontainer;
1026 WARN_ON(ptr < container);
1027 WARN_ON(ptr + len > container + container_len);
1030 static inline void btrfs_memcpy(struct btrfs_root *root,
1032 void *dst, const void *src, size_t nr)
1034 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1035 memcpy(dst, src, nr);
1038 static inline void btrfs_memmove(struct btrfs_root *root,
1040 void *dst, void *src, size_t nr)
1042 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1043 memmove(dst, src, nr);
1046 static inline int btrfs_set_root_name(struct btrfs_root *root,
1047 const char *name, int len)
1049 /* if we already have a name just free it */
1053 root->name = kmalloc(len+1, GFP_KERNEL);
1057 memcpy(root->name, name, len);
1058 root->name[len] ='\0';
1063 /* helper function to cast into the data area of the leaf. */
1064 #define btrfs_item_ptr(leaf, slot, type) \
1065 ((type *)(btrfs_leaf_data(leaf) + \
1066 btrfs_item_offset((leaf)->items + (slot))))
1068 /* mount option defines and helpers */
1069 #define BTRFS_MOUNT_SUBVOL 0x000001
1070 #define btrfs_clear_opt(o, opt) o &= ~BTRFS_MOUNT_##opt
1071 #define btrfs_set_opt(o, opt) o |= BTRFS_MOUNT_##opt
1072 #define btrfs_test_opt(sb, opt) (BTRFS_SB(sb)->s_mount_opt & \
1075 int btrfs_extent_post_op(struct btrfs_trans_handle *trans,
1076 struct btrfs_root *root);
1077 int btrfs_copy_pinned(struct btrfs_root *root, struct radix_tree_root *copy);
1078 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1079 btrfs_fs_info *info,
1081 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1082 struct btrfs_block_group_cache
1083 *hint, u64 search_start,
1084 int data, int owner);
1085 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1086 struct btrfs_root *root);
1087 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1088 struct btrfs_root *root, u64 hint,
1090 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1091 struct btrfs_root *root, u64 owner,
1092 u64 num_blocks, u64 empty_size, u64 search_start,
1093 u64 search_end, struct btrfs_key *ins, int data);
1094 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1095 struct buffer_head *buf);
1096 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1097 *root, u64 blocknr, u64 num_blocks, int pin);
1098 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans,
1099 struct btrfs_root *root,
1100 struct radix_tree_root *unpin_radix);
1101 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1102 struct btrfs_root *root,
1103 u64 blocknr, u64 num_blocks);
1104 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1105 struct btrfs_root *root);
1106 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1107 int btrfs_read_block_groups(struct btrfs_root *root);
1109 int btrfs_cow_block(struct btrfs_trans_handle *trans, struct btrfs_root
1110 *root, struct buffer_head *buf, struct buffer_head
1111 *parent, int parent_slot, struct buffer_head
1113 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1114 *root, struct btrfs_path *path, u32 data_size);
1115 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1116 struct btrfs_root *root,
1117 struct btrfs_path *path,
1119 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1120 *root, struct btrfs_key *key, struct btrfs_path *p, int
1122 int btrfs_realloc_node(struct btrfs_trans_handle *trans,
1123 struct btrfs_root *root, struct buffer_head *parent,
1124 int cache_only, u64 *last_ret);
1125 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1126 struct btrfs_path *btrfs_alloc_path(void);
1127 void btrfs_free_path(struct btrfs_path *p);
1128 void btrfs_init_path(struct btrfs_path *p);
1129 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1130 struct btrfs_path *path);
1131 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1132 *root, struct btrfs_key *key, void *data, u32 data_size);
1133 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1134 *root, struct btrfs_path *path, struct btrfs_key
1135 *cpu_key, u32 data_size);
1136 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1137 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1138 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1141 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1142 struct btrfs_key *key);
1143 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1144 *root, struct btrfs_key *key, struct btrfs_root_item
1146 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1147 *root, struct btrfs_key *key, struct btrfs_root_item
1149 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1150 btrfs_root_item *item, struct btrfs_key *key);
1151 int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid,
1152 struct btrfs_root *latest_root);
1154 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1155 *root, const char *name, int name_len, u64 dir,
1156 struct btrfs_key *location, u8 type);
1157 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1158 struct btrfs_root *root,
1159 struct btrfs_path *path, u64 dir,
1160 const char *name, int name_len,
1162 struct btrfs_dir_item *
1163 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1164 struct btrfs_root *root,
1165 struct btrfs_path *path, u64 dir,
1166 u64 objectid, const char *name, int name_len,
1168 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1169 struct btrfs_path *path,
1170 const char *name, int name_len);
1171 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1172 struct btrfs_root *root,
1173 struct btrfs_path *path,
1174 struct btrfs_dir_item *di);
1176 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1177 struct btrfs_root *fs_root,
1178 u64 dirid, u64 *objectid);
1179 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1182 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1183 *root, u64 objectid, struct btrfs_inode_item
1185 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1186 *root, struct btrfs_path *path,
1187 struct btrfs_key *location, int mod);
1190 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1191 struct btrfs_root *root,
1192 u64 objectid, u64 pos, u64 offset,
1193 u64 disk_num_blocks,
1195 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1196 struct btrfs_root *root,
1197 struct btrfs_path *path, u64 objectid,
1198 u64 blocknr, int mod);
1199 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1200 struct btrfs_root *root,
1201 u64 objectid, u64 offset,
1202 char *data, size_t len);
1203 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1204 struct btrfs_root *root,
1205 struct btrfs_path *path,
1206 u64 objectid, u64 offset,
1208 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1209 struct btrfs_root *root, struct btrfs_path *path,
1212 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1213 int btrfs_readpage(struct file *file, struct page *page);
1214 void btrfs_delete_inode(struct inode *inode);
1215 void btrfs_read_locked_inode(struct inode *inode);
1216 int btrfs_write_inode(struct inode *inode, int wait);
1217 void btrfs_dirty_inode(struct inode *inode);
1218 struct inode *btrfs_alloc_inode(struct super_block *sb);
1219 void btrfs_destroy_inode(struct inode *inode);
1220 int btrfs_init_cachep(void);
1221 void btrfs_destroy_cachep(void);
1222 int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
1224 long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
1226 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1227 struct btrfs_root *root);
1228 int btrfs_commit_write(struct file *file, struct page *page,
1229 unsigned from, unsigned to);
1230 int btrfs_get_block(struct inode *inode, sector_t iblock,
1231 struct buffer_head *result, int create);
1232 struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
1233 size_t page_offset, u64 start, u64 end,
1235 int btrfs_update_inode(struct btrfs_trans_handle *trans,
1236 struct btrfs_root *root,
1237 struct inode *inode);
1239 int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end);
1240 extern struct file_operations btrfs_file_operations;
1241 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1242 struct btrfs_root *root, struct inode *inode,
1243 u64 start, u64 end, u64 *hint_block);
1245 int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
1246 struct btrfs_root *root, int cache_only);
1249 int btrfs_init_sysfs(void);
1250 void btrfs_exit_sysfs(void);
1251 int btrfs_sysfs_add_super(struct btrfs_fs_info *fs);
1252 int btrfs_sysfs_add_root(struct btrfs_root *root);
1253 void btrfs_sysfs_del_root(struct btrfs_root *root);
1254 void btrfs_sysfs_del_super(struct btrfs_fs_info *root);