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

 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	int __bi_remaining;
 
23	unsigned long bi_flags;
24	struct bvec_iter bi_iter;
25	bio_end_io_t *bi_end_io;
26#if defined(CONFIG_BLK_DEV_INTEGRITY)
27	struct bio_integrity_payload *bi_integrity;
28#endif
29};
30
31static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
32{
 
 
 
33	bd->bi_bdev = bio->bi_bdev;
 
 
34	bd->bi_flags = bio->bi_flags;
35	bd->bi_iter = bio->bi_iter;
36	bd->__bi_remaining = atomic_read(&bio->__bi_remaining);
37	bd->bi_end_io = bio->bi_end_io;
38#if defined(CONFIG_BLK_DEV_INTEGRITY)
39	bd->bi_integrity = bio_integrity(bio);
40#endif
41}
42
43static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
44{
 
 
 
45	bio->bi_bdev = bd->bi_bdev;
 
 
46	bio->bi_flags = bd->bi_flags;
47	bio->bi_iter = bd->bi_iter;
48	atomic_set(&bio->__bi_remaining, bd->__bi_remaining);
49	bio->bi_end_io = bd->bi_end_io;
50#if defined(CONFIG_BLK_DEV_INTEGRITY)
51	bio->bi_integrity = bd->bi_integrity;
52#endif
53}
54
55#endif