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
20struct dm_bio_details {
21 struct gendisk *bi_disk;
22 u8 bi_partno;
23 unsigned long bi_flags;
24 struct bvec_iter bi_iter;
25};
26
27static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
28{
29 bd->bi_disk = bio->bi_disk;
30 bd->bi_partno = bio->bi_partno;
31 bd->bi_flags = bio->bi_flags;
32 bd->bi_iter = bio->bi_iter;
33}
34
35static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
36{
37 bio->bi_disk = bd->bi_disk;
38 bio->bi_partno = bd->bi_partno;
39 bio->bi_flags = bd->bi_flags;
40 bio->bi_iter = bd->bi_iter;
41}
42
43#endif
44