1 /*
2 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
3 *
4 * This file is released under the GPL.
5 */
6
7 #ifndef DM_BIO_RECORD_H
8 #define DM_BIO_RECORD_H
9
10 #include <linux/bio.h>
11
12 /*
13 * There are lots of mutable fields in the bio struct that get
14 * changed by the lower levels of the block layer. Some targets,
15 * such as multipath, may wish to resubmit a bio on error. The
16 * functions in this file help the target record and restore the
17 * original bio state.
18 */
19 struct dm_bio_details {
20 sector_t bi_sector;
21 struct block_device *bi_bdev;
22 unsigned int bi_size;
23 unsigned short bi_idx;
24 unsigned long bi_flags;
25 };
26
27 static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
28 {
29 bd->bi_sector = bio->bi_sector;
30 bd->bi_bdev = bio->bi_bdev;
31 bd->bi_size = bio->bi_size;
32 bd->bi_idx = bio->bi_idx;
33 bd->bi_flags = bio->bi_flags;
34 }
35
36 static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
37 {
38 bio->bi_sector = bd->bi_sector;
39 bio->bi_bdev = bd->bi_bdev;
40 bio->bi_size = bd->bi_size;
41 bio->bi_idx = bd->bi_idx;
42 bio->bi_flags = bd->bi_flags;
43 }
44
45 #endif
46
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