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 20 struct dm_bio_details { 21 struct gendisk *bi_disk; 22 u8 bi_partno; 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 32 static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio) 33 { 34 bd->bi_disk = bio->bi_disk; 35 bd->bi_partno = bio->bi_partno; 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_disk = bd->bi_disk; 48 bio->bi_partno = bd->bi_partno; 49 bio->bi_flags = bd->bi_flags; 50 bio->bi_iter = bd->bi_iter; 51 atomic_set(&bio->__bi_remaining, bd->__bi_remaining); 52 bio->bi_end_io = bd->bi_end_io; 53 #if defined(CONFIG_BLK_DEV_INTEGRITY) 54 bio->bi_integrity = bd->bi_integrity; 55 #endif 56 } 57 58 #endif 59