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 "bit-radix.h"
27 struct btrfs_trans_handle;
28 struct btrfs_transaction;
29 extern struct kmem_cache *btrfs_trans_handle_cachep;
30 extern struct kmem_cache *btrfs_transaction_cachep;
31 extern struct kmem_cache *btrfs_bit_radix_cachep;
32 extern struct kmem_cache *btrfs_path_cachep;
34 #define BTRFS_MAGIC "_BtRfS_M"
36 #define BTRFS_ROOT_TREE_OBJECTID 1ULL
37 #define BTRFS_EXTENT_TREE_OBJECTID 2ULL
38 #define BTRFS_FS_TREE_OBJECTID 3ULL
39 #define BTRFS_ROOT_TREE_DIR_OBJECTID 4ULL
40 #define BTRFS_FIRST_FREE_OBJECTID 5ULL
43 * we can actually store much bigger names, but lets not confuse the rest
46 #define BTRFS_NAME_LEN 255
48 /* 32 bytes in various csum fields */
49 #define BTRFS_CSUM_SIZE 32
50 /* four bytes for CRC32 */
51 #define BTRFS_CRC32_SIZE 4
52 #define BTRFS_EMPTY_DIR_SIZE 6
54 #define BTRFS_FT_UNKNOWN 0
55 #define BTRFS_FT_REG_FILE 1
56 #define BTRFS_FT_DIR 2
57 #define BTRFS_FT_CHRDEV 3
58 #define BTRFS_FT_BLKDEV 4
59 #define BTRFS_FT_FIFO 5
60 #define BTRFS_FT_SOCK 6
61 #define BTRFS_FT_SYMLINK 7
62 #define BTRFS_FT_MAX 8
65 * the key defines the order in the tree, and so it also defines (optimal)
66 * block layout. objectid corresonds to the inode number. The flags
67 * tells us things about the object, and is a kind of stream selector.
68 * so for a given inode, keys with flags of 1 might refer to the inode
69 * data, flags of 2 may point to file data in the btree and flags == 3
70 * may point to extents.
72 * offset is the starting byte offset for this key in the stream.
74 * btrfs_disk_key is in disk byte order. struct btrfs_key is always
75 * in cpu native order. Otherwise they are identical and their sizes
76 * should be the same (ie both packed)
78 struct btrfs_disk_key {
82 } __attribute__ ((__packed__));
88 } __attribute__ ((__packed__));
91 * every tree block (leaf or node) starts with this header.
94 u8 csum[BTRFS_CSUM_SIZE];
95 u8 fsid[16]; /* FS specific uuid */
96 __le64 blocknr; /* which block this node is supposed to live in */
102 } __attribute__ ((__packed__));
104 #define BTRFS_MAX_LEVEL 8
105 #define BTRFS_NODEPTRS_PER_BLOCK(r) (((r)->blocksize - \
106 sizeof(struct btrfs_header)) / \
107 (sizeof(struct btrfs_disk_key) + sizeof(u64)))
108 #define __BTRFS_LEAF_DATA_SIZE(bs) ((bs) - sizeof(struct btrfs_header))
109 #define BTRFS_LEAF_DATA_SIZE(r) (__BTRFS_LEAF_DATA_SIZE(r->blocksize))
110 #define BTRFS_MAX_INLINE_DATA_SIZE(r) (BTRFS_LEAF_DATA_SIZE(r) - \
111 sizeof(struct btrfs_item) - \
112 sizeof(struct btrfs_file_extent_item))
116 * the super block basically lists the main trees of the FS
117 * it currently lacks any block count etc etc
119 struct btrfs_super_block {
120 u8 csum[BTRFS_CSUM_SIZE];
121 /* the first 3 fields must match struct btrfs_header */
122 u8 fsid[16]; /* FS specific uuid */
123 __le64 blocknr; /* this block number */
129 __le64 root_dir_objectid;
131 } __attribute__ ((__packed__));
134 * A leaf is full of items. offset and size tell us where to find
135 * the item in the leaf (relative to the start of the data area)
138 struct btrfs_disk_key key;
141 } __attribute__ ((__packed__));
144 * leaves have an item area and a data area:
145 * [item0, item1....itemN] [free space] [dataN...data1, data0]
147 * The data is separate from the items to get the keys closer together
151 struct btrfs_header header;
152 struct btrfs_item items[];
153 } __attribute__ ((__packed__));
156 * all non-leaf blocks are nodes, they hold only keys and pointers to
159 struct btrfs_key_ptr {
160 struct btrfs_disk_key key;
162 } __attribute__ ((__packed__));
165 struct btrfs_header header;
166 struct btrfs_key_ptr ptrs[];
167 } __attribute__ ((__packed__));
170 * btrfs_paths remember the path taken from the root down to the leaf.
171 * level 0 is always the leaf, and nodes[1...BTRFS_MAX_LEVEL] will point
172 * to any other levels that are present.
174 * The slots array records the index of the item or block pointer
175 * used while walking the tree.
178 struct buffer_head *nodes[BTRFS_MAX_LEVEL];
179 int slots[BTRFS_MAX_LEVEL];
183 * items in the extent btree are used to record the objectid of the
184 * owner of the block and the number of references
186 struct btrfs_extent_item {
189 } __attribute__ ((__packed__));
191 struct btrfs_inode_timespec {
194 } __attribute__ ((__packed__));
197 * there is no padding here on purpose. If you want to extent the inode,
198 * make a new item type
200 struct btrfs_inode_item {
212 struct btrfs_inode_timespec atime;
213 struct btrfs_inode_timespec ctime;
214 struct btrfs_inode_timespec mtime;
215 struct btrfs_inode_timespec otime;
216 } __attribute__ ((__packed__));
218 struct btrfs_dir_item {
219 struct btrfs_disk_key location;
223 } __attribute__ ((__packed__));
225 struct btrfs_root_item {
226 struct btrfs_inode_item inode;
233 struct btrfs_disk_key drop_progress;
235 } __attribute__ ((__packed__));
237 #define BTRFS_FILE_EXTENT_REG 0
238 #define BTRFS_FILE_EXTENT_INLINE 1
240 struct btrfs_file_extent_item {
244 * disk space consumed by the extent, checksum blocks are included
248 __le64 disk_num_blocks;
250 * the logical offset in file blocks (no csums)
251 * this extent record is for. This allows a file extent to point
252 * into the middle of an existing extent on disk, sharing it
253 * between two snapshots (useful if some bytes in the middle of the
254 * extent have changed
258 * the logical number of file blocks (no csums included)
261 } __attribute__ ((__packed__));
263 struct btrfs_csum_item {
265 } __attribute__ ((__packed__));
267 /* tag for the radix tree of block groups in ram */
268 #define BTRFS_BLOCK_GROUP_DIRTY 0
269 #define BTRFS_BLOCK_GROUP_AVAIL 1
270 #define BTRFS_BLOCK_GROUP_SIZE (256 * 1024 * 1024)
273 #define BTRFS_BLOCK_GROUP_DATA 1
274 struct btrfs_block_group_item {
277 } __attribute__ ((__packed__));
279 struct btrfs_block_group_cache {
280 struct btrfs_key key;
281 struct btrfs_block_group_item item;
282 struct radix_tree_root *radix;
291 struct btrfs_fs_info {
292 struct btrfs_root *extent_root;
293 struct btrfs_root *tree_root;
294 struct radix_tree_root fs_roots_radix;
295 struct radix_tree_root pending_del_radix;
296 struct radix_tree_root pinned_radix;
297 struct radix_tree_root block_group_radix;
298 struct radix_tree_root block_group_data_radix;
299 struct radix_tree_root extent_map_radix;
301 u64 extent_tree_insert[BTRFS_MAX_LEVEL * 3];
302 int extent_tree_insert_nr;
303 u64 extent_tree_prealloc[BTRFS_MAX_LEVEL * 3];
304 int extent_tree_prealloc_nr;
307 struct btrfs_transaction *running_transaction;
308 struct btrfs_super_block *disk_super;
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;
322 * in ram representation of the tree. extent_root is used for all allocations
323 * and for the extent tree extent_root root.
326 struct buffer_head *node;
327 struct buffer_head *commit_root;
328 struct btrfs_root_item root_item;
329 struct btrfs_key root_key;
330 struct btrfs_fs_info *fs_info;
338 u64 last_inode_alloc;
341 /* the lower bits in the key flags defines the item type */
342 #define BTRFS_KEY_TYPE_MAX 256
343 #define BTRFS_KEY_TYPE_SHIFT 24
344 #define BTRFS_KEY_TYPE_MASK (((u32)BTRFS_KEY_TYPE_MAX - 1) << \
345 BTRFS_KEY_TYPE_SHIFT)
348 * inode items have the data typically returned from stat and store other
349 * info about object characteristics. There is one for every file and dir in
352 #define BTRFS_INODE_ITEM_KEY 1
354 /* reserve 2-15 close to the inode for later flexibility */
357 * dir items are the name -> inode pointers in a directory. There is one
358 * for every name in a directory.
360 #define BTRFS_DIR_ITEM_KEY 16
361 #define BTRFS_DIR_INDEX_KEY 17
363 * extent data is for file data
365 #define BTRFS_EXTENT_DATA_KEY 18
367 * csum items have the checksums for data in the extents
369 #define BTRFS_CSUM_ITEM_KEY 19
371 /* reserve 20-31 for other file stuff */
374 * root items point to tree roots. There are typically in the root
375 * tree used by the super block to find all the other trees
377 #define BTRFS_ROOT_ITEM_KEY 32
379 * extent items are in the extent map tree. These record which blocks
380 * are used, and how many references there are to each block
382 #define BTRFS_EXTENT_ITEM_KEY 33
385 * block groups give us hints into the extent allocation trees. Which
386 * blocks are free etc etc
388 #define BTRFS_BLOCK_GROUP_ITEM_KEY 34
391 * string items are for debugging. They just store a short string of
394 #define BTRFS_STRING_ITEM_KEY 253
397 static inline u64 btrfs_block_group_used(struct btrfs_block_group_item *bi)
399 return le64_to_cpu(bi->used);
402 static inline void btrfs_set_block_group_used(struct
403 btrfs_block_group_item *bi,
406 bi->used = cpu_to_le64(val);
409 static inline u64 btrfs_inode_generation(struct btrfs_inode_item *i)
411 return le64_to_cpu(i->generation);
414 static inline void btrfs_set_inode_generation(struct btrfs_inode_item *i,
417 i->generation = cpu_to_le64(val);
420 static inline u64 btrfs_inode_size(struct btrfs_inode_item *i)
422 return le64_to_cpu(i->size);
425 static inline void btrfs_set_inode_size(struct btrfs_inode_item *i, u64 val)
427 i->size = cpu_to_le64(val);
430 static inline u64 btrfs_inode_nblocks(struct btrfs_inode_item *i)
432 return le64_to_cpu(i->nblocks);
435 static inline void btrfs_set_inode_nblocks(struct btrfs_inode_item *i, u64 val)
437 i->nblocks = cpu_to_le64(val);
440 static inline u64 btrfs_inode_block_group(struct btrfs_inode_item *i)
442 return le64_to_cpu(i->block_group);
445 static inline void btrfs_set_inode_block_group(struct btrfs_inode_item *i,
448 i->block_group = cpu_to_le64(val);
451 static inline u32 btrfs_inode_nlink(struct btrfs_inode_item *i)
453 return le32_to_cpu(i->nlink);
456 static inline void btrfs_set_inode_nlink(struct btrfs_inode_item *i, u32 val)
458 i->nlink = cpu_to_le32(val);
461 static inline u32 btrfs_inode_uid(struct btrfs_inode_item *i)
463 return le32_to_cpu(i->uid);
466 static inline void btrfs_set_inode_uid(struct btrfs_inode_item *i, u32 val)
468 i->uid = cpu_to_le32(val);
471 static inline u32 btrfs_inode_gid(struct btrfs_inode_item *i)
473 return le32_to_cpu(i->gid);
476 static inline void btrfs_set_inode_gid(struct btrfs_inode_item *i, u32 val)
478 i->gid = cpu_to_le32(val);
481 static inline u32 btrfs_inode_mode(struct btrfs_inode_item *i)
483 return le32_to_cpu(i->mode);
486 static inline void btrfs_set_inode_mode(struct btrfs_inode_item *i, u32 val)
488 i->mode = cpu_to_le32(val);
491 static inline u32 btrfs_inode_rdev(struct btrfs_inode_item *i)
493 return le32_to_cpu(i->rdev);
496 static inline void btrfs_set_inode_rdev(struct btrfs_inode_item *i, u32 val)
498 i->rdev = cpu_to_le32(val);
501 static inline u16 btrfs_inode_flags(struct btrfs_inode_item *i)
503 return le16_to_cpu(i->flags);
506 static inline void btrfs_set_inode_flags(struct btrfs_inode_item *i, u16 val)
508 i->flags = cpu_to_le16(val);
511 static inline u16 btrfs_inode_compat_flags(struct btrfs_inode_item *i)
513 return le16_to_cpu(i->compat_flags);
516 static inline void btrfs_set_inode_compat_flags(struct btrfs_inode_item *i,
519 i->compat_flags = cpu_to_le16(val);
522 static inline u64 btrfs_timespec_sec(struct btrfs_inode_timespec *ts)
524 return le64_to_cpu(ts->sec);
527 static inline void btrfs_set_timespec_sec(struct btrfs_inode_timespec *ts,
530 ts->sec = cpu_to_le64(val);
533 static inline u32 btrfs_timespec_nsec(struct btrfs_inode_timespec *ts)
535 return le32_to_cpu(ts->nsec);
538 static inline void btrfs_set_timespec_nsec(struct btrfs_inode_timespec *ts,
541 ts->nsec = cpu_to_le32(val);
544 static inline u32 btrfs_extent_refs(struct btrfs_extent_item *ei)
546 return le32_to_cpu(ei->refs);
549 static inline void btrfs_set_extent_refs(struct btrfs_extent_item *ei, u32 val)
551 ei->refs = cpu_to_le32(val);
554 static inline u64 btrfs_extent_owner(struct btrfs_extent_item *ei)
556 return le64_to_cpu(ei->owner);
559 static inline void btrfs_set_extent_owner(struct btrfs_extent_item *ei, u64 val)
561 ei->owner = cpu_to_le64(val);
564 static inline u64 btrfs_node_blockptr(struct btrfs_node *n, int nr)
566 return le64_to_cpu(n->ptrs[nr].blockptr);
570 static inline void btrfs_set_node_blockptr(struct btrfs_node *n, int nr,
573 n->ptrs[nr].blockptr = cpu_to_le64(val);
576 static inline u32 btrfs_item_offset(struct btrfs_item *item)
578 return le32_to_cpu(item->offset);
581 static inline void btrfs_set_item_offset(struct btrfs_item *item, u32 val)
583 item->offset = cpu_to_le32(val);
586 static inline u32 btrfs_item_end(struct btrfs_item *item)
588 return le32_to_cpu(item->offset) + le16_to_cpu(item->size);
591 static inline u16 btrfs_item_size(struct btrfs_item *item)
593 return le16_to_cpu(item->size);
596 static inline void btrfs_set_item_size(struct btrfs_item *item, u16 val)
598 item->size = cpu_to_le16(val);
601 static inline u16 btrfs_dir_flags(struct btrfs_dir_item *d)
603 return le16_to_cpu(d->flags);
606 static inline void btrfs_set_dir_flags(struct btrfs_dir_item *d, u16 val)
608 d->flags = cpu_to_le16(val);
611 static inline u8 btrfs_dir_type(struct btrfs_dir_item *d)
616 static inline void btrfs_set_dir_type(struct btrfs_dir_item *d, u8 val)
621 static inline u16 btrfs_dir_name_len(struct btrfs_dir_item *d)
623 return le16_to_cpu(d->name_len);
626 static inline void btrfs_set_dir_name_len(struct btrfs_dir_item *d, u16 val)
628 d->name_len = cpu_to_le16(val);
631 static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
632 struct btrfs_disk_key *disk)
634 cpu->offset = le64_to_cpu(disk->offset);
635 cpu->flags = le32_to_cpu(disk->flags);
636 cpu->objectid = le64_to_cpu(disk->objectid);
639 static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
640 struct btrfs_key *cpu)
642 disk->offset = cpu_to_le64(cpu->offset);
643 disk->flags = cpu_to_le32(cpu->flags);
644 disk->objectid = cpu_to_le64(cpu->objectid);
647 static inline u64 btrfs_disk_key_objectid(struct btrfs_disk_key *disk)
649 return le64_to_cpu(disk->objectid);
652 static inline void btrfs_set_disk_key_objectid(struct btrfs_disk_key *disk,
655 disk->objectid = cpu_to_le64(val);
658 static inline u64 btrfs_disk_key_offset(struct btrfs_disk_key *disk)
660 return le64_to_cpu(disk->offset);
663 static inline void btrfs_set_disk_key_offset(struct btrfs_disk_key *disk,
666 disk->offset = cpu_to_le64(val);
669 static inline u32 btrfs_disk_key_flags(struct btrfs_disk_key *disk)
671 return le32_to_cpu(disk->flags);
674 static inline void btrfs_set_disk_key_flags(struct btrfs_disk_key *disk,
677 disk->flags = cpu_to_le32(val);
680 static inline u32 btrfs_disk_key_type(struct btrfs_disk_key *key)
682 return le32_to_cpu(key->flags) >> BTRFS_KEY_TYPE_SHIFT;
685 static inline void btrfs_set_disk_key_type(struct btrfs_disk_key *key,
688 u32 flags = btrfs_disk_key_flags(key);
689 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
690 val = val << BTRFS_KEY_TYPE_SHIFT;
691 flags = (flags & ~BTRFS_KEY_TYPE_MASK) | val;
692 btrfs_set_disk_key_flags(key, flags);
695 static inline u32 btrfs_key_type(struct btrfs_key *key)
697 return key->flags >> BTRFS_KEY_TYPE_SHIFT;
700 static inline void btrfs_set_key_type(struct btrfs_key *key, u32 val)
702 BUG_ON(val >= BTRFS_KEY_TYPE_MAX);
703 val = val << BTRFS_KEY_TYPE_SHIFT;
704 key->flags = (key->flags & ~(BTRFS_KEY_TYPE_MASK)) | val;
707 static inline u64 btrfs_header_blocknr(struct btrfs_header *h)
709 return le64_to_cpu(h->blocknr);
712 static inline void btrfs_set_header_blocknr(struct btrfs_header *h, u64 blocknr)
714 h->blocknr = cpu_to_le64(blocknr);
717 static inline u64 btrfs_header_generation(struct btrfs_header *h)
719 return le64_to_cpu(h->generation);
722 static inline void btrfs_set_header_generation(struct btrfs_header *h,
725 h->generation = cpu_to_le64(val);
728 static inline u64 btrfs_header_owner(struct btrfs_header *h)
730 return le64_to_cpu(h->owner);
733 static inline void btrfs_set_header_owner(struct btrfs_header *h,
736 h->owner = cpu_to_le64(val);
739 static inline u16 btrfs_header_nritems(struct btrfs_header *h)
741 return le16_to_cpu(h->nritems);
744 static inline void btrfs_set_header_nritems(struct btrfs_header *h, u16 val)
746 h->nritems = cpu_to_le16(val);
749 static inline u16 btrfs_header_flags(struct btrfs_header *h)
751 return le16_to_cpu(h->flags);
754 static inline void btrfs_set_header_flags(struct btrfs_header *h, u16 val)
756 h->flags = cpu_to_le16(val);
759 static inline int btrfs_header_level(struct btrfs_header *h)
764 static inline void btrfs_set_header_level(struct btrfs_header *h, int level)
766 BUG_ON(level > BTRFS_MAX_LEVEL);
770 static inline int btrfs_is_leaf(struct btrfs_node *n)
772 return (btrfs_header_level(&n->header) == 0);
775 static inline u64 btrfs_root_blocknr(struct btrfs_root_item *item)
777 return le64_to_cpu(item->blocknr);
780 static inline void btrfs_set_root_blocknr(struct btrfs_root_item *item, u64 val)
782 item->blocknr = cpu_to_le64(val);
785 static inline u64 btrfs_root_dirid(struct btrfs_root_item *item)
787 return le64_to_cpu(item->root_dirid);
790 static inline void btrfs_set_root_dirid(struct btrfs_root_item *item, u64 val)
792 item->root_dirid = cpu_to_le64(val);
795 static inline u32 btrfs_root_refs(struct btrfs_root_item *item)
797 return le32_to_cpu(item->refs);
800 static inline void btrfs_set_root_refs(struct btrfs_root_item *item, u32 val)
802 item->refs = cpu_to_le32(val);
805 static inline u32 btrfs_root_flags(struct btrfs_root_item *item)
807 return le32_to_cpu(item->flags);
810 static inline void btrfs_set_root_flags(struct btrfs_root_item *item, u32 val)
812 item->flags = cpu_to_le32(val);
815 static inline u64 btrfs_super_blocknr(struct btrfs_super_block *s)
817 return le64_to_cpu(s->blocknr);
820 static inline void btrfs_set_super_blocknr(struct btrfs_super_block *s, u64 val)
822 s->blocknr = cpu_to_le64(val);
825 static inline u64 btrfs_super_generation(struct btrfs_super_block *s)
827 return le64_to_cpu(s->generation);
830 static inline void btrfs_set_super_generation(struct btrfs_super_block *s,
833 s->generation = cpu_to_le64(val);
836 static inline u64 btrfs_super_root(struct btrfs_super_block *s)
838 return le64_to_cpu(s->root);
841 static inline void btrfs_set_super_root(struct btrfs_super_block *s, u64 val)
843 s->root = cpu_to_le64(val);
846 static inline u64 btrfs_super_total_blocks(struct btrfs_super_block *s)
848 return le64_to_cpu(s->total_blocks);
851 static inline void btrfs_set_super_total_blocks(struct btrfs_super_block *s,
854 s->total_blocks = cpu_to_le64(val);
857 static inline u64 btrfs_super_blocks_used(struct btrfs_super_block *s)
859 return le64_to_cpu(s->blocks_used);
862 static inline void btrfs_set_super_blocks_used(struct btrfs_super_block *s,
865 s->blocks_used = cpu_to_le64(val);
868 static inline u32 btrfs_super_blocksize(struct btrfs_super_block *s)
870 return le32_to_cpu(s->blocksize);
873 static inline void btrfs_set_super_blocksize(struct btrfs_super_block *s,
876 s->blocksize = cpu_to_le32(val);
879 static inline u64 btrfs_super_root_dir(struct btrfs_super_block *s)
881 return le64_to_cpu(s->root_dir_objectid);
884 static inline void btrfs_set_super_root_dir(struct btrfs_super_block *s, u64
887 s->root_dir_objectid = cpu_to_le64(val);
890 static inline u8 *btrfs_leaf_data(struct btrfs_leaf *l)
892 return (u8 *)l->items;
895 static inline int btrfs_file_extent_type(struct btrfs_file_extent_item *e)
899 static inline void btrfs_set_file_extent_type(struct btrfs_file_extent_item *e,
905 static inline char *btrfs_file_extent_inline_start(struct
906 btrfs_file_extent_item *e)
908 return (char *)(&e->disk_blocknr);
911 static inline u32 btrfs_file_extent_calc_inline_size(u32 datasize)
913 return (unsigned long)(&((struct
914 btrfs_file_extent_item *)NULL)->disk_blocknr) + datasize;
917 static inline u32 btrfs_file_extent_inline_len(struct btrfs_item *e)
919 struct btrfs_file_extent_item *fe = NULL;
920 return btrfs_item_size(e) - (unsigned long)(&fe->disk_blocknr);
923 static inline u64 btrfs_file_extent_disk_blocknr(struct btrfs_file_extent_item
926 return le64_to_cpu(e->disk_blocknr);
929 static inline void btrfs_set_file_extent_disk_blocknr(struct
930 btrfs_file_extent_item
933 e->disk_blocknr = cpu_to_le64(val);
936 static inline u64 btrfs_file_extent_generation(struct btrfs_file_extent_item *e)
938 return le64_to_cpu(e->generation);
941 static inline void btrfs_set_file_extent_generation(struct
942 btrfs_file_extent_item *e,
945 e->generation = cpu_to_le64(val);
948 static inline u64 btrfs_file_extent_disk_num_blocks(struct
949 btrfs_file_extent_item *e)
951 return le64_to_cpu(e->disk_num_blocks);
954 static inline void btrfs_set_file_extent_disk_num_blocks(struct
955 btrfs_file_extent_item
958 e->disk_num_blocks = cpu_to_le64(val);
961 static inline u64 btrfs_file_extent_offset(struct btrfs_file_extent_item *e)
963 return le64_to_cpu(e->offset);
966 static inline void btrfs_set_file_extent_offset(struct btrfs_file_extent_item
969 e->offset = cpu_to_le64(val);
972 static inline u64 btrfs_file_extent_num_blocks(struct btrfs_file_extent_item
975 return le64_to_cpu(e->num_blocks);
978 static inline void btrfs_set_file_extent_num_blocks(struct
979 btrfs_file_extent_item *e,
982 e->num_blocks = cpu_to_le64(val);
985 static inline struct btrfs_root *btrfs_sb(struct super_block *sb)
987 return sb->s_fs_info;
990 static inline void btrfs_check_bounds(void *vptr, size_t len,
991 void *vcontainer, size_t container_len)
994 char *container = vcontainer;
995 WARN_ON(ptr < container);
996 WARN_ON(ptr + len > container + container_len);
999 static inline void btrfs_memcpy(struct btrfs_root *root,
1001 void *dst, const void *src, size_t nr)
1003 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1004 memcpy(dst, src, nr);
1007 static inline void btrfs_memmove(struct btrfs_root *root,
1009 void *dst, void *src, size_t nr)
1011 btrfs_check_bounds(dst, nr, dst_block, root->fs_info->sb->s_blocksize);
1012 memmove(dst, src, nr);
1015 static inline void btrfs_mark_buffer_dirty(struct buffer_head *bh)
1017 WARN_ON(!atomic_read(&bh->b_count));
1018 mark_buffer_dirty(bh);
1021 /* helper function to cast into the data area of the leaf. */
1022 #define btrfs_item_ptr(leaf, slot, type) \
1023 ((type *)(btrfs_leaf_data(leaf) + \
1024 btrfs_item_offset((leaf)->items + (slot))))
1027 struct btrfs_block_group_cache *btrfs_lookup_block_group(struct
1028 btrfs_fs_info *info,
1030 struct btrfs_block_group_cache *btrfs_find_block_group(struct btrfs_root *root,
1031 struct btrfs_block_group_cache
1032 *hint, u64 search_start,
1033 int data, int owner);
1034 int btrfs_inc_root_ref(struct btrfs_trans_handle *trans,
1035 struct btrfs_root *root);
1036 struct buffer_head *btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
1037 struct btrfs_root *root, u64 hint);
1038 int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
1039 struct btrfs_root *root, u64 owner,
1040 u64 num_blocks, u64 search_start,
1041 u64 search_end, struct btrfs_key *ins, int data);
1042 int btrfs_inc_ref(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1043 struct buffer_head *buf);
1044 int btrfs_free_extent(struct btrfs_trans_handle *trans, struct btrfs_root
1045 *root, u64 blocknr, u64 num_blocks, int pin);
1046 int btrfs_finish_extent_commit(struct btrfs_trans_handle *trans, struct
1048 int btrfs_inc_extent_ref(struct btrfs_trans_handle *trans,
1049 struct btrfs_root *root,
1050 u64 blocknr, u64 num_blocks);
1051 int btrfs_write_dirty_block_groups(struct btrfs_trans_handle *trans,
1052 struct btrfs_root *root);
1053 int btrfs_free_block_groups(struct btrfs_fs_info *info);
1054 int btrfs_read_block_groups(struct btrfs_root *root);
1056 int btrfs_extend_item(struct btrfs_trans_handle *trans, struct btrfs_root
1057 *root, struct btrfs_path *path, u32 data_size);
1058 int btrfs_truncate_item(struct btrfs_trans_handle *trans,
1059 struct btrfs_root *root,
1060 struct btrfs_path *path,
1062 int btrfs_search_slot(struct btrfs_trans_handle *trans, struct btrfs_root
1063 *root, struct btrfs_key *key, struct btrfs_path *p, int
1065 void btrfs_release_path(struct btrfs_root *root, struct btrfs_path *p);
1066 struct btrfs_path *btrfs_alloc_path(void);
1067 void btrfs_free_path(struct btrfs_path *p);
1068 void btrfs_init_path(struct btrfs_path *p);
1069 int btrfs_del_item(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1070 struct btrfs_path *path);
1071 int btrfs_insert_item(struct btrfs_trans_handle *trans, struct btrfs_root
1072 *root, struct btrfs_key *key, void *data, u32 data_size);
1073 int btrfs_insert_empty_item(struct btrfs_trans_handle *trans, struct btrfs_root
1074 *root, struct btrfs_path *path, struct btrfs_key
1075 *cpu_key, u32 data_size);
1076 int btrfs_next_leaf(struct btrfs_root *root, struct btrfs_path *path);
1077 int btrfs_leaf_free_space(struct btrfs_root *root, struct btrfs_leaf *leaf);
1078 int btrfs_drop_snapshot(struct btrfs_trans_handle *trans, struct btrfs_root
1079 *root, struct buffer_head *snap);
1081 int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1082 struct btrfs_key *key);
1083 int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
1084 *root, struct btrfs_key *key, struct btrfs_root_item
1086 int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
1087 *root, struct btrfs_key *key, struct btrfs_root_item
1089 int btrfs_find_last_root(struct btrfs_root *root, u64 objectid, struct
1090 btrfs_root_item *item, struct btrfs_key *key);
1091 int btrfs_find_dead_roots(struct btrfs_root *root);
1093 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
1094 *root, const char *name, int name_len, u64 dir,
1095 struct btrfs_key *location, u8 type);
1096 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
1097 struct btrfs_root *root,
1098 struct btrfs_path *path, u64 dir,
1099 const char *name, int name_len,
1101 struct btrfs_dir_item *
1102 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
1103 struct btrfs_root *root,
1104 struct btrfs_path *path, u64 dir,
1105 u64 objectid, const char *name, int name_len,
1107 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
1108 struct btrfs_path *path,
1109 const char *name, int name_len);
1110 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
1111 struct btrfs_root *root,
1112 struct btrfs_path *path,
1113 struct btrfs_dir_item *di);
1115 int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
1116 struct btrfs_root *fs_root,
1117 u64 dirid, u64 *objectid);
1118 int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
1121 int btrfs_insert_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1122 *root, u64 objectid, struct btrfs_inode_item
1124 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
1125 *root, struct btrfs_path *path,
1126 struct btrfs_key *location, int mod);
1129 int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
1130 struct btrfs_root *root,
1131 u64 objectid, u64 pos, u64 offset,
1132 u64 disk_num_blocks,
1134 int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
1135 struct btrfs_root *root,
1136 struct btrfs_path *path, u64 objectid,
1137 u64 blocknr, int mod);
1138 int btrfs_csum_file_block(struct btrfs_trans_handle *trans,
1139 struct btrfs_root *root,
1140 u64 objectid, u64 offset,
1141 char *data, size_t len);
1142 struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
1143 struct btrfs_root *root,
1144 struct btrfs_path *path,
1145 u64 objectid, u64 offset,
1147 int btrfs_csum_truncate(struct btrfs_trans_handle *trans,
1148 struct btrfs_root *root, struct btrfs_path *path,
1151 int btrfs_page_mkwrite(struct vm_area_struct *vma, struct page *page);
1152 int btrfs_readpage(struct file *file, struct page *page);
1153 void btrfs_delete_inode(struct inode *inode);
1154 void btrfs_read_locked_inode(struct inode *inode);
1155 int btrfs_write_inode(struct inode *inode, int wait);
1156 void btrfs_dirty_inode(struct inode *inode);
1157 struct inode *btrfs_alloc_inode(struct super_block *sb);
1158 void btrfs_destroy_inode(struct inode *inode);
1159 int btrfs_init_cachep(void);
1160 void btrfs_destroy_cachep(void);
1161 int btrfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
1163 long btrfs_compat_ioctl(struct file *file, unsigned int cmd,
1165 struct inode *btrfs_iget_locked(struct super_block *s, u64 objectid,
1166 struct btrfs_root *root);
1167 int btrfs_commit_write(struct file *file, struct page *page,
1168 unsigned from, unsigned to);
1169 int btrfs_get_block(struct inode *inode, sector_t iblock,
1170 struct buffer_head *result, int create);
1172 extern struct file_operations btrfs_file_operations;
1173 int btrfs_drop_extents(struct btrfs_trans_handle *trans,
1174 struct btrfs_root *root, struct inode *inode,
1175 u64 start, u64 end, u64 *hint_block);