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
);
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