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>
26 struct list_head dev_list;
27 struct btrfs_root *dev_root;
28 struct buffer_head *pending_io;
32 struct block_device *bdev;
38 /* the internal btrfs device id */
41 /* size of the device */
47 /* optimal io alignment for this device */
50 /* optimal io width for this device */
53 /* minimal io size for this device */
56 /* type and info about this device */
59 /* physical drive uuid (or lvm uuid) */
60 u8 uuid[BTRFS_UUID_SIZE];
63 struct btrfs_fs_devices {
64 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
66 /* the device with this id has the most recent coyp of the super */
71 struct block_device *latest_bdev;
72 struct block_device *lowest_bdev;
73 struct list_head devices;
74 struct list_head list;
77 struct btrfs_bio_stripe {
78 struct btrfs_device *dev;
82 struct btrfs_multi_bio {
83 atomic_t stripes_pending;
88 struct btrfs_bio_stripe stripes[];
91 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
92 (sizeof(struct btrfs_bio_stripe) * (n)))
94 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
95 struct btrfs_device *device,
96 u64 chunk_tree, u64 chunk_objectid,
98 u64 num_bytes, u64 *start);
99 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
100 u64 logical, u64 *length,
101 struct btrfs_multi_bio **multi_ret, int mirror_num);
102 int btrfs_read_sys_array(struct btrfs_root *root);
103 int btrfs_read_chunk_tree(struct btrfs_root *root);
104 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
105 struct btrfs_root *extent_root, u64 *start,
106 u64 *num_bytes, u64 type);
107 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
108 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
109 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
111 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
112 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
113 int flags, void *holder);
114 int btrfs_scan_one_device(const char *path, int flags, void *holder,
115 struct btrfs_fs_devices **fs_devices_ret);
116 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
117 int btrfs_add_device(struct btrfs_trans_handle *trans,
118 struct btrfs_root *root,
119 struct btrfs_device *device);
120 int btrfs_cleanup_fs_uuids(void);
121 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);