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