Kent Overstreet 1c3b13e64c
dm: Refactor for new bio cloning/splitting ...
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 >
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1c3b13e64c