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(&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(&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