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 block_device *bi_bdev; 22 int __bi_remaining; 23 unsigned long bi_flags; 24 struct bvec_iter bi_iter; 25 bio_end_io_t *bi_end_io; 26 #if defined(CONFIG_BLK_DEV_INTEGRITY) 27 struct bio_integrity_payload *bi_integrity; 28 #endif 29 }; 30 31 static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio) 32 { 33 bd->bi_bdev = bio->bi_bdev; 34 bd->bi_flags = bio->bi_flags; 35 bd->bi_iter = bio->bi_iter; 36 bd->__bi_remaining = atomic_read(&bio->__bi_remaining); 37 bd->bi_end_io = bio->bi_end_io; 38 #if defined(CONFIG_BLK_DEV_INTEGRITY) 39 bd->bi_integrity = bio_integrity(bio); 40 #endif 41 } 42 43 static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio) 44 { 45 bio->bi_bdev = bd->bi_bdev; 46 bio->bi_flags = bd->bi_flags; 47 bio->bi_iter = bd->bi_iter; 48 atomic_set(&bio->__bi_remaining, bd->__bi_remaining); 49 bio->bi_end_io = bd->bi_end_io; 50 #if defined(CONFIG_BLK_DEV_INTEGRITY) 51 bio->bi_integrity = bd->bi_integrity; 52 #endif 53 } 54 55 #endif 56