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 unsigned long bi_flags; 24 struct bvec_iter bi_iter; 25 }; 26 27 static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio) 28 { 29 bd->bi_disk = bio->bi_disk; 30 bd->bi_partno = bio->bi_partno; 31 bd->bi_flags = bio->bi_flags; 32 bd->bi_iter = bio->bi_iter; 33 } 34 35 static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio) 36 { 37 bio->bi_disk = bd->bi_disk; 38 bio->bi_partno = bd->bi_partno; 39 bio->bi_flags = bd->bi_flags; 40 bio->bi_iter = bd->bi_iter; 41 } 42 43 #endif 44