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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>
23 #include "async-thread.h"
27 struct list_head dev_list
;
28 struct list_head dev_alloc_list
;
29 struct btrfs_fs_devices
*fs_devices
;
30 struct btrfs_root
*dev_root
;
31 struct buffer_head
*pending_io
;
32 struct bio
*pending_bios
;
33 struct bio
*pending_bio_tail
;
43 struct block_device
*bdev
;
47 /* the internal btrfs device id */
50 /* size of the device */
56 /* optimal io alignment for this device */
59 /* optimal io width for this device */
62 /* minimal io size for this device */
65 /* type and info about this device */
68 /* physical drive uuid (or lvm uuid) */
69 u8 uuid
[BTRFS_UUID_SIZE
];
71 struct btrfs_work work
;
74 struct btrfs_fs_devices
{
75 u8 fsid
[BTRFS_FSID_SIZE
]; /* FS specific uuid */
77 /* the device with this id has the most recent coyp of the super */
84 struct block_device
*latest_bdev
;
85 /* all of the devices in the FS */
86 struct list_head devices
;
88 /* devices not currently being allocated */
89 struct list_head alloc_list
;
90 struct list_head list
;
92 struct btrfs_fs_devices
*seed
;
99 struct btrfs_bio_stripe
{
100 struct btrfs_device
*dev
;
104 struct btrfs_multi_bio
{
105 atomic_t stripes_pending
;
106 bio_end_io_t
*end_io
;
107 struct bio
*orig_bio
;
112 struct btrfs_bio_stripe stripes
[];
115 #define btrfs_multi_bio_size(n) (sizeof(struct btrfs_multi_bio) + \
116 (sizeof(struct btrfs_bio_stripe) * (n)))
118 int btrfs_alloc_dev_extent(struct btrfs_trans_handle
*trans
,
119 struct btrfs_device
*device
,
120 u64 chunk_tree
, u64 chunk_objectid
,
121 u64 chunk_offset
, u64 start
, u64 num_bytes
);
122 int btrfs_map_block(struct btrfs_mapping_tree
*map_tree
, int rw
,
123 u64 logical
, u64
*length
,
124 struct btrfs_multi_bio
**multi_ret
, int mirror_num
);
125 int btrfs_read_sys_array(struct btrfs_root
*root
);
126 int btrfs_read_chunk_tree(struct btrfs_root
*root
);
127 int btrfs_alloc_chunk(struct btrfs_trans_handle
*trans
,
128 struct btrfs_root
*extent_root
, u64 type
);
129 void btrfs_mapping_init(struct btrfs_mapping_tree
*tree
);
130 void btrfs_mapping_tree_free(struct btrfs_mapping_tree
*tree
);
131 int btrfs_map_bio(struct btrfs_root
*root
, int rw
, struct bio
*bio
,
132 int mirror_num
, int async_submit
);
133 int btrfs_read_super_device(struct btrfs_root
*root
, struct extent_buffer
*buf
);
134 int btrfs_open_devices(struct btrfs_fs_devices
*fs_devices
,
135 int flags
, void *holder
);
136 int btrfs_scan_one_device(const char *path
, int flags
, void *holder
,
137 struct btrfs_fs_devices
**fs_devices_ret
);
138 int btrfs_close_devices(struct btrfs_fs_devices
*fs_devices
);
139 int btrfs_close_extra_devices(struct btrfs_fs_devices
*fs_devices
);
140 int btrfs_add_device(struct btrfs_trans_handle
*trans
,
141 struct btrfs_root
*root
,
142 struct btrfs_device
*device
);
143 int btrfs_rm_device(struct btrfs_root
*root
, char *device_path
);
144 int btrfs_cleanup_fs_uuids(void);
145 int btrfs_num_copies(struct btrfs_mapping_tree
*map_tree
, u64 logical
, u64 len
);
146 int btrfs_unplug_page(struct btrfs_mapping_tree
*map_tree
,
147 u64 logical
, struct page
*page
);
148 int btrfs_grow_device(struct btrfs_trans_handle
*trans
,
149 struct btrfs_device
*device
, u64 new_size
);
150 struct btrfs_device
*btrfs_find_device(struct btrfs_root
*root
, u64 devid
,
152 int btrfs_shrink_device(struct btrfs_device
*device
, u64 new_size
);
153 int btrfs_init_new_device(struct btrfs_root
*root
, char *path
);
154 int btrfs_balance(struct btrfs_root
*dev_root
);
155 void btrfs_unlock_volumes(void);
156 void btrfs_lock_volumes(void);
157 int btrfs_chunk_readonly(struct btrfs_root
*root
, u64 chunk_offset
);