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 #include <linux/blk-integrity.h>
12 
13 /*
14  * There are lots of mutable fields in the bio struct that get
15  * changed by the lower levels of the block layer.  Some targets,
16  * such as multipath, may wish to resubmit a bio on error.  The
17  * functions in this file help the target record and restore the
18  * original bio state.
19  */
20 
21 struct dm_bio_details {
22 	struct block_device *bi_bdev;
23 	int __bi_remaining;
24 	unsigned long bi_flags;
25 	struct bvec_iter bi_iter;
26 	bio_end_io_t *bi_end_io;
27 #if defined(CONFIG_BLK_DEV_INTEGRITY)
28 	struct bio_integrity_payload *bi_integrity;
29 #endif
30 };
31 
dm_bio_record(struct dm_bio_details * bd,struct bio * bio)32 static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
33 {
34 	bd->bi_bdev = bio->bi_bdev;
35 	bd->bi_flags = bio->bi_flags;
36 	bd->bi_iter = bio->bi_iter;
37 	bd->__bi_remaining = atomic_read(&bio->__bi_remaining);
38 	bd->bi_end_io = bio->bi_end_io;
39 #if defined(CONFIG_BLK_DEV_INTEGRITY)
40 	bd->bi_integrity = bio_integrity(bio);
41 #endif
42 }
43 
dm_bio_restore(struct dm_bio_details * bd,struct bio * bio)44 static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
45 {
46 	bio->bi_bdev = bd->bi_bdev;
47 	bio->bi_flags = bd->bi_flags;
48 	bio->bi_iter = bd->bi_iter;
49 	atomic_set(&bio->__bi_remaining, bd->__bi_remaining);
50 	bio->bi_end_io = bd->bi_end_io;
51 #if defined(CONFIG_BLK_DEV_INTEGRITY)
52 	bio->bi_integrity = bd->bi_integrity;
53 #endif
54 }
55 
56 #endif
57