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(&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(&bio->__bi_remaining, 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

 
 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_vec_details {
21#if PAGE_SIZE < 65536
22	__u16 bv_len;
23	__u16 bv_offset;
24#else
25	unsigned bv_len;
26	unsigned bv_offset;
27#endif
28};
29
30struct dm_bio_details {
31	sector_t bi_sector;
32	struct block_device *bi_bdev;
33	unsigned int bi_size;
34	unsigned short bi_idx;
35	unsigned long bi_flags;
36	struct dm_bio_vec_details bi_io_vec[BIO_MAX_PAGES];
 
 
 
 
37};
38
39static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
40{
41	unsigned i;
42
43	bd->bi_sector = bio->bi_sector;
44	bd->bi_bdev = bio->bi_bdev;
45	bd->bi_size = bio->bi_size;
46	bd->bi_idx = bio->bi_idx;
47	bd->bi_flags = bio->bi_flags;
48
49	for (i = 0; i < bio->bi_vcnt; i++) {
50		bd->bi_io_vec[i].bv_len = bio->bi_io_vec[i].bv_len;
51		bd->bi_io_vec[i].bv_offset = bio->bi_io_vec[i].bv_offset;
52	}
 
53}
54
55static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
56{
57	unsigned i;
58
59	bio->bi_sector = bd->bi_sector;
60	bio->bi_bdev = bd->bi_bdev;
61	bio->bi_size = bd->bi_size;
62	bio->bi_idx = bd->bi_idx;
63	bio->bi_flags = bd->bi_flags;
64
65	for (i = 0; i < bio->bi_vcnt; i++) {
66		bio->bi_io_vec[i].bv_len = bd->bi_io_vec[i].bv_len;
67		bio->bi_io_vec[i].bv_offset = bd->bi_io_vec[i].bv_offset;
68	}
 
69}
70
71#endif