| 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 | |
| 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(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 | |
| 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(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 |