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 struct dm_bio_details { 20 sector_t bi_sector; 21 struct block_device *bi_bdev; 22 unsigned int bi_size; 23 unsigned short bi_idx; 24 unsigned long bi_flags; 25 }; 26 27 static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio) 28 { 29 bd->bi_sector = bio->bi_sector; 30 bd->bi_bdev = bio->bi_bdev; 31 bd->bi_size = bio->bi_size; 32 bd->bi_idx = bio->bi_idx; 33 bd->bi_flags = bio->bi_flags; 34 } 35 36 static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio) 37 { 38 bio->bi_sector = bd->bi_sector; 39 bio->bi_bdev = bd->bi_bdev; 40 bio->bi_size = bd->bi_size; 41 bio->bi_idx = bd->bi_idx; 42 bio->bi_flags = bd->bi_flags; 43 } 44 45 #endif 46