1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
4 *
5 * This file is released under the GPL.
6 */
7
8#ifndef DM_BIO_RECORD_H
9#define DM_BIO_RECORD_H
10
11#include <linux/bio.h>
12#include <linux/blk-integrity.h>
13
14/*
15 * There are lots of mutable fields in the bio struct that get
16 * changed by the lower levels of the block layer. Some targets,
17 * such as multipath, may wish to resubmit a bio on error. The
18 * functions in this file help the target record and restore the
19 * original bio state.
20 */
21
22struct dm_bio_details {
23 struct block_device *bi_bdev;
24 int __bi_remaining;
25 unsigned long bi_flags;
26 struct bvec_iter bi_iter;
27 bio_end_io_t *bi_end_io;
28#if defined(CONFIG_BLK_DEV_INTEGRITY)
29 struct bio_integrity_payload *bi_integrity;
30#endif
31};
32
33static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
34{
35 bd->bi_bdev = bio->bi_bdev;
36 bd->bi_flags = bio->bi_flags;
37 bd->bi_iter = bio->bi_iter;
38 bd->__bi_remaining = atomic_read(v: &bio->__bi_remaining);
39 bd->bi_end_io = bio->bi_end_io;
40#if defined(CONFIG_BLK_DEV_INTEGRITY)
41 bd->bi_integrity = bio_integrity(bio);
42#endif
43}
44
45static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
46{
47 bio->bi_bdev = bd->bi_bdev;
48 bio->bi_flags = bd->bi_flags;
49 bio->bi_iter = bd->bi_iter;
50 atomic_set(v: &bio->__bi_remaining, i: bd->__bi_remaining);
51 bio->bi_end_io = bd->bi_end_io;
52#if defined(CONFIG_BLK_DEV_INTEGRITY)
53 bio->bi_integrity = bd->bi_integrity;
54#endif
55}
56
57#endif
58