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authorChris Mason <chris.mason@oracle.com>2008-03-24 15:01:56 -0400
committerChris Mason <chris.mason@oracle.com>2008-09-25 11:04:00 -0400
commit0b86a832a1f38abec695864ec2eaedc9d2383f1b (patch)
tree8ec0db0b55f77eb6a23fe7db3c1064d298db55c1 /fs/btrfs/volumes.h
parent7f93bf8d27653726e3721c01fefc523487ecf2af (diff)
Btrfs: Add support for multiple devices per filesystem
Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/volumes.h')
-rw-r--r--fs/btrfs/volumes.h78
1 files changed, 78 insertions, 0 deletions
diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
new file mode 100644
index 000000000000..4a47dcb00a73
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+++ b/fs/btrfs/volumes.h
@@ -0,0 +1,78 @@
1/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
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.
7 *
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.
12 *
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.
17 */
18
19#ifndef __BTRFS_VOLUMES_
20#define __BTRFS_VOLUMES_
21struct btrfs_device {
22 struct list_head dev_list;
23 struct btrfs_root *dev_root;
24 struct btrfs_key dev_key;
25
26 struct block_device *bdev;
27
28 /* the internal btrfs device id */
29 u64 devid;
30
31 /* size of the device */
32 u64 total_bytes;
33
34 /* bytes used */
35 u64 bytes_used;
36
37 /* optimal io alignment for this device */
38 u32 io_align;
39
40 /* optimal io width for this device */
41 u32 io_width;
42
43 /* minimal io size for this device */
44 u32 sector_size;
45
46 /* the kernel device number */
47 u64 rdev;
48
49 /* type and info about this device */
50 u64 type;
51
52 /* partition number, 0 for whole dev */
53 int partition;
54
55 /* length of the name data at the end of the item */
56 int name_len;
57
58 /* physical drive uuid (or lvm uuid) */
59 u8 uuid[BTRFS_DEV_UUID_SIZE];
60
61 char *name;
62};
63
64int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
65 struct btrfs_device *device,
66 u64 owner, u64 num_bytes, u64 *start);
67int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
68 u64 logical, u64 *phys, u64 *length,
69 struct btrfs_device **dev);
70int btrfs_read_sys_array(struct btrfs_root *root);
71int btrfs_read_chunk_tree(struct btrfs_root *root);
72int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
73 struct btrfs_root *extent_root, u64 *start,
74 u64 *num_bytes, u32 type);
75void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
76void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
77int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio);
78#endif