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;
35 struct block_device *bdev;
41 /* the internal btrfs device id */
44 /* size of the device */
50 /* optimal io alignment for this device */
53 /* optimal io width for this device */
56 /* minimal io size for this device */
59 /* type and info about this device */
62 /* physical drive uuid (or lvm uuid) */
63 u8 uuid[BTRFS_UUID_SIZE];
66 struct btrfs_fs_devices {
67 u8 fsid[BTRFS_FSID_SIZE]; /* FS specific uuid */
69 /* the device with this id has the most recent coyp of the super */
74 struct block_device *latest_bdev;
75 struct block_device *lowest_bdev;
76 /* all of the devices in the FS */
77 struct list_head devices;
79 /* devices not currently being allocated */
80 struct list_head alloc_list;
81 struct list_head list;
84 struct btrfs_bio_stripe {
85 struct btrfs_device *dev;
89 struct btrfs_multi_bio {
90 atomic_t stripes_pending;
95 struct btrfs_bio_stripe stripes[];
98 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
99 (sizeof(struct btrfs_bio_stripe) * (n)))
101 int btrfs_alloc_dev_extent(struct btrfs_trans_handle *trans,
102 struct btrfs_device *device,
103 u64 chunk_tree, u64 chunk_objectid,
105 u64 num_bytes, u64 *start);
106 int btrfs_map_block(struct btrfs_mapping_tree *map_tree, int rw,
107 u64 logical, u64 *length,
108 struct btrfs_multi_bio **multi_ret, int mirror_num);
109 int btrfs_read_sys_array(struct btrfs_root *root);
110 int btrfs_read_chunk_tree(struct btrfs_root *root);
111 int btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
112 struct btrfs_root *extent_root, u64 *start,
113 u64 *num_bytes, u64 type);
114 void btrfs_mapping_init(struct btrfs_mapping_tree *tree);
115 void btrfs_mapping_tree_free(struct btrfs_mapping_tree *tree);
116 int btrfs_map_bio(struct btrfs_root *root, int rw, struct bio *bio,
118 int btrfs_read_super_device(struct btrfs_root *root, struct extent_buffer *buf);
119 int btrfs_open_devices(struct btrfs_fs_devices *fs_devices,
120 int flags, void *holder);
121 int btrfs_scan_one_device(const char *path, int flags, void *holder,
122 struct btrfs_fs_devices **fs_devices_ret);
123 int btrfs_close_devices(struct btrfs_fs_devices *fs_devices);
124 int btrfs_add_device(struct btrfs_trans_handle *trans,
125 struct btrfs_root *root,
126 struct btrfs_device *device);
127 int btrfs_cleanup_fs_uuids(void);
128 int btrfs_num_copies(struct btrfs_mapping_tree *map_tree, u64 logical, u64 len);
129 int btrfs_unplug_page(struct btrfs_mapping_tree *map_tree,
130 u64 logical, struct page *page);
131 int btrfs_grow_device(struct btrfs_trans_handle *trans,
132 struct btrfs_device *device, u64 new_size);
133 struct btrfs_device *btrfs_find_device(struct btrfs_root *root, u64 devid,
135 int btrfs_shrink_device(struct btrfs_device *device, u64 new_size);
136 int btrfs_init_new_device(struct btrfs_root *root, char *path);
137 int btrfs_balance(struct btrfs_root *dev_root);