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 list_head dev_alloc_list;
28 struct btrfs_root *dev_root;
29 struct buffer_head *pending_io;
37 struct block_device *bdev;
43 /* the internal btrfs device id */
46 /* size of the device */
52 /* optimal io alignment for this device */
55 /* optimal io width for this device */
58 /* minimal io size for this device */
61 /* type and info about this device */
64 /* physical drive uuid (or lvm uuid) */
65 u8 uuid[BTRFS_UUID_SIZE];
68 struct btrfs_fs_devices {
69 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
71 /* the device with this id has the most recent coyp of the super */
76 struct block_device *latest_bdev;
77 struct block_device *lowest_bdev;
78 /* all of the devices in the FS */
79 struct list_head devices;
81 /* devices not currently being allocated */
82 struct list_head alloc_list;
83 struct list_head list;
86 struct btrfs_bio_stripe {
87 struct btrfs_device *dev;
91 struct btrfs_multi_bio {
92 atomic_t stripes_pending;
98 struct btrfs_bio_stripe stripes[];
101 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
102 (sizeof(struct btrfs_bio_stripe) * (n)))
104 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
105 struct btrfs_device *device,
106 u64 chunk_tree, u64 chunk_objectid,
108 u64 num_bytes, u64 *start);
109 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
110 u64 logical, u64 *length,
111 struct btrfs_multi_bio **multi_ret, int mirror_num);
112 int btrfs_read_sys_array(struct btrfs_root *root);
113 int btrfs_read_chunk_tree(struct btrfs_root *root);
114 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
115 struct btrfs_root *extent_root, u64 *start,
116 u64 *num_bytes, u64 type);
117 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
118 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
119 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
121 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
122 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
123 int flags, void *holder);
124 int btrfs_scan_one_device(const char *path, int flags, void *holder,
125 struct btrfs_fs_devices **fs_devices_ret);
126 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
127 int btrfs_close_extra_devices(struct btrfs_fs_devices *fs_devices);
128 int btrfs_add_device(struct btrfs_trans_handle *trans,
129 struct btrfs_root *root,
130 struct btrfs_device *device);
131 int btrfs_rm_device(struct btrfs_root *root, char *device_path);
132 int btrfs_cleanup_fs_uuids(void);
133 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
134 int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
135 u64 logical, struct page *page);
136 int btrfs_grow_device(struct btrfs_trans_handle *trans,
137 struct btrfs_device *device, u64 new_size);
138 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
140 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
141 int btrfs_init_new_device(struct btrfs_root *root, char *path);
142 int btrfs_balance(struct btrfs_root *dev_root);
143 void btrfs_unlock_volumes(void);
144 void btrfs_lock_volumes(void);