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Re: [PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP

From Christoph Hellwig <hch@infradead.org>
Newsgroups linux.kernel
Subject Re: [PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP
Date 2016-10-31 16:40 +0100
Message-ID <symQO-4eD-19@gated-at.bofh.it> (permalink)
References <sxx1U-3GR-3@gated-at.bofh.it> <sxxbz-3Kf-11@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On Sat, Oct 29, 2016 at 04:08:27PM +0800, Ming Lei wrote:
> Some drivers(such as dm) should be capable of dealing with multipage
> bvec, but the incoming bio may be too big, such as, a new singlepage bvec
> bio can't be cloned from the bio, or can't be allocated to singlepage
> bvec with same size.
> 
> At least crypt dm, log writes and bcache have this kind of issue.

We already have the segment_size limitation for request based drivers.
I'd rather extent it to bio drivers if really needed.

But then again we should look into not having this limitation.  E.g.
for bcache I'd be really surprised if it's that limited, given that
Kent came up with this whole multipage bvec scheme.

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[PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP Ming Lei <tom.leiming@gmail.com> - 2016-10-29 10:30 +0200
  Re: [PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP Christoph Hellwig <hch@infradead.org> - 2016-10-31 16:40 +0100
    Re: [PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP Ming Lei <tom.leiming@gmail.com> - 2016-11-01 01:00 +0100
    Re: [PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP Kent Overstreet <kent.overstreet@gmail.com> - 2016-11-02 04:10 +0100
      Re: [PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP Ming Lei <tom.leiming@gmail.com> - 2016-11-03 11:40 +0100
        Re: [PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP Ming Lei <tom.leiming@gmail.com> - 2016-11-03 12:30 +0100
          Re: [PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP Kent Overstreet <kent.overstreet@gmail.com> - 2016-11-03 12:40 +0100
        Re: [PATCH 28/60] block: introduce QUEUE_FLAG_SPLIT_MP Kent Overstreet <kent.overstreet@gmail.com> - 2016-11-03 12:30 +0100

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