xref: /openbmc/linux/drivers/md/dm-bio-record.h (revision 3bd94003)
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 
22 struct 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 
dm_bio_record(struct dm_bio_details * bd,struct bio * bio)33 static 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 
dm_bio_restore(struct dm_bio_details * bd,struct bio * bio)45 static 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
58