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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_vec_details { |
21 | #if PAGE_SIZE < 65536 |
22 | __u16 bv_len; |
23 | __u16 bv_offset; |
24 | #else |
25 | unsigned bv_len; |
26 | unsigned bv_offset; |
27 | #endif |
28 | }; |
29 | |
30 | struct dm_bio_details { |
31 | sector_t bi_sector; |
32 | struct block_device *bi_bdev; |
33 | unsigned int bi_size; |
34 | unsigned short bi_idx; |
35 | unsigned long bi_flags; |
36 | struct dm_bio_vec_details bi_io_vec[BIO_MAX_PAGES]; |
37 | }; |
38 | |
39 | static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio) |
40 | { |
41 | unsigned i; |
42 | |
43 | bd->bi_sector = bio->bi_sector; |
44 | bd->bi_bdev = bio->bi_bdev; |
45 | bd->bi_size = bio->bi_size; |
46 | bd->bi_idx = bio->bi_idx; |
47 | bd->bi_flags = bio->bi_flags; |
48 | |
49 | for (i = 0; i < bio->bi_vcnt; i++) { |
50 | bd->bi_io_vec[i].bv_len = bio->bi_io_vec[i].bv_len; |
51 | bd->bi_io_vec[i].bv_offset = bio->bi_io_vec[i].bv_offset; |
52 | } |
53 | } |
54 | |
55 | static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio) |
56 | { |
57 | unsigned i; |
58 | |
59 | bio->bi_sector = bd->bi_sector; |
60 | bio->bi_bdev = bd->bi_bdev; |
61 | bio->bi_size = bd->bi_size; |
62 | bio->bi_idx = bd->bi_idx; |
63 | bio->bi_flags = bd->bi_flags; |
64 | |
65 | for (i = 0; i < bio->bi_vcnt; i++) { |
66 | bio->bi_io_vec[i].bv_len = bd->bi_io_vec[i].bv_len; |
67 | bio->bi_io_vec[i].bv_offset = bd->bi_io_vec[i].bv_offset; |
68 | } |
69 | } |
70 | |
71 | #endif |
72 |
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