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 struct list_head dev_list;
23 struct btrfs_root *dev_root;
25 struct block_device *bdev;
29 /* the internal btrfs device id */
32 /* size of the device */
38 /* optimal io alignment for this device */
41 /* optimal io width for this device */
44 /* minimal io size for this device */
47 /* type and info about this device */
50 /* physical drive uuid (or lvm uuid) */
51 u8 uuid[BTRFS_DEV_UUID_SIZE];
54 struct btrfs_fs_devices {
55 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
57 /* the device with this id has the most recent coyp of the super */
62 struct block_device *latest_bdev;
63 struct block_device *lowest_bdev;
64 struct list_head devices;
65 struct list_head list;
68 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
69 struct btrfs_device *device,
70 u64 owner, u64 num_bytes, u64 *start);
71 int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
72 u64 logical, u64 *phys, u64 *length,
73 struct btrfs_device **dev);
74 int btrfs_read_sys_array(struct btrfs_root *root);
75 int btrfs_read_chunk_tree(struct btrfs_root *root);
76 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
77 struct btrfs_root *extent_root, u64 *start,
78 u64 *num_bytes, u64 type);
79 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
80 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
81 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio);
82 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
83 int btrfs_map_block(struct btrfs_mapping_tree *map_tree,
84 u64 logical, u64 *phys, u64 *length,
85 struct btrfs_device **dev);
86 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
87 int flags, void *holder);
88 int btrfs_scan_one_device(const char *path, int flags, void *holder,
89 struct btrfs_fs_devices **fs_devices_ret);
90 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
91 int btrfs_add_device(struct btrfs_trans_handle *trans,
92 struct btrfs_root *root,
93 struct btrfs_device *device);
94 int btrfs_cleanup_fs_uuids(void);