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.
19 #ifndef __BTRFS_VOLUMES_
20 #define __BTRFS_VOLUMES_
22 #include <linux/bio.h>
25 struct list_head dev_list;
26 struct btrfs_root *dev_root;
29 struct block_device *bdev;
35 /* the internal btrfs device id */
38 /* size of the device */
44 /* optimal io alignment for this device */
47 /* optimal io width for this device */
50 /* minimal io size for this device */
53 /* type and info about this device */
56 /* physical drive uuid (or lvm uuid) */
57 u8 uuid[BTRFS_DEV_UUID_SIZE];
60 struct btrfs_fs_devices {
61 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
63 /* the device with this id has the most recent coyp of the super */
68 struct block_device *latest_bdev;
69 struct block_device *lowest_bdev;
70 struct list_head devices;
71 struct list_head list;
74 struct btrfs_bio_stripe {
75 struct btrfs_device *dev;
79 struct btrfs_multi_bio {
80 atomic_t stripes_pending;
85 struct btrfs_bio_stripe stripes[];
88 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
89 (sizeof(struct btrfs_bio_stripe) * (n)))
91 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
92 struct btrfs_device *device,
93 u64 owner, u64 num_bytes, u64 *start);
94 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
95 u64 logical, u64 *length,
96 struct btrfs_multi_bio **multi_ret);
97 int btrfs_read_sys_array(struct btrfs_root *root);
98 int btrfs_read_chunk_tree(struct btrfs_root *root);
99 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
100 struct btrfs_root *extent_root, u64 *start,
101 u64 *num_bytes, u64 type);
102 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
103 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
104 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio);
105 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
106 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
107 int flags, void *holder);
108 int btrfs_scan_one_device(const char *path, int flags, void *holder,
109 struct btrfs_fs_devices **fs_devices_ret);
110 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
111 int btrfs_add_device(struct btrfs_trans_handle *trans,
112 struct btrfs_root *root,
113 struct btrfs_device *device);
114 int btrfs_cleanup_fs_uuids(void);