On Mon, 27 Apr 2015 23:48:34 -0700 Ming Lin <mlin@xxxxxxxxxx> wrote: > From: Kent Overstreet <kent.overstreet@xxxxxxxxx> > > As generic_make_request() is now able to handle arbitrarily sized bios, > it's no longer necessary for each individual block driver to define its > own ->merge_bvec_fn() callback. Remove every invocation completely. This patch it just a little premature I think. md/raid5 still assumes read requests will mostly fit within a single chunk (which merge_bvec_fn encourages) so they can be serviced without using the stripe-cache. You've just broken that assumption. I think 'chunk_aligned_read' needs to get a loop using bio_split, a bit like raid0, first. Thanks, NeilBrown
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