| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |