forked from luck/tmp_suning_uos_patched
1c3b13e64c
We need to convert the dm code to the new bvec_iter primitives which respect bi_bvec_done; they also allow us to drastically simplify dm's bio splitting code. Also, it's no longer necessary to save/restore the bvec array anymore - driver conversions for immutable bvecs are done, so drivers should never be modifying it. Also kill bio_sector_offset(), dm was the only user and it doesn't make much sense anymore. Signed-off-by: Kent Overstreet <kmo@daterainc.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Alasdair Kergon <agk@redhat.com> Cc: dm-devel@redhat.com Reviewed-by: Mike Snitzer <snitzer@redhat.com>
41 lines
936 B
C
41 lines
936 B
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_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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};
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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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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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}
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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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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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}
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#endif
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