75d5d81565
This patch doesn't itself have any functional changes, but immutable biovecs are going to add a bi_bvec_done member to bi_iter, which will need to be saved too here. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: Alasdair Kergon <agk@redhat.com> Cc: dm-devel@redhat.com Reviewed-by: Mike Snitzer <snitzer@redhat.com>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/*
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* Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the GPL.
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*/
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#ifndef DM_BIO_RECORD_H
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#define DM_BIO_RECORD_H
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#include <linux/bio.h>
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/*
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* There are lots of mutable fields in the bio struct that get
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* changed by the lower levels of the block layer. Some targets,
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* such as multipath, may wish to resubmit a bio on error. The
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* functions in this file help the target record and restore the
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* original bio state.
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*/
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struct dm_bio_vec_details {
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#if PAGE_SIZE < 65536
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__u16 bv_len;
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__u16 bv_offset;
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#else
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unsigned bv_len;
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unsigned bv_offset;
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#endif
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};
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struct dm_bio_details {
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struct block_device *bi_bdev;
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unsigned long bi_flags;
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struct bvec_iter bi_iter;
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struct dm_bio_vec_details bi_io_vec[BIO_MAX_PAGES];
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};
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static inline void dm_bio_record(struct dm_bio_details *bd, struct bio *bio)
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{
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unsigned i;
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bd->bi_bdev = bio->bi_bdev;
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bd->bi_flags = bio->bi_flags;
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bd->bi_iter = bio->bi_iter;
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for (i = 0; i < bio->bi_vcnt; i++) {
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bd->bi_io_vec[i].bv_len = bio->bi_io_vec[i].bv_len;
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bd->bi_io_vec[i].bv_offset = bio->bi_io_vec[i].bv_offset;
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}
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}
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static inline void dm_bio_restore(struct dm_bio_details *bd, struct bio *bio)
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{
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unsigned i;
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bio->bi_bdev = bd->bi_bdev;
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bio->bi_flags = bd->bi_flags;
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bio->bi_iter = bd->bi_iter;
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for (i = 0; i < bio->bi_vcnt; i++) {
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bio->bi_io_vec[i].bv_len = bd->bi_io_vec[i].bv_len;
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bio->bi_io_vec[i].bv_offset = bd->bi_io_vec[i].bv_offset;
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}
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}
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#endif
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