On Fri, 22 Nov 2013 07:36:18 -0800 Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > While this is trivial to fix it's also fairly unexpected and easy > to get wrong for new callers. Neil, can you explain why you > desperately need it? Desperately? Not at all? Need? Not really. This is just in RAID5 and merge_bvec_fn is purely an optimisation for RAID5. Limiting read BIOs to one chunk allows us to bypass the stripe-cache, so can be good. Limiting write BIOs is completely unnecessary so we currently don't bother. So I have no objection to bvm->bi_rw being removed. Thanks, NeilBrown
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