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