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Date:   Wed, 30 Aug 2017 01:51:38 -0700
From:   Christoph Hellwig <>
To:     Long Li <>
Cc:     Christoph Hellwig <>,
        Steve French <>,
        "" <>,
        "" <>,
        "" <>
Subject: Re: [[PATCH v1] 15/37] [CIFS] SMBD: Post a SMBD data transfer
 message with data payload

On Wed, Aug 30, 2017 at 02:17:56AM +0000, Long Li wrote:
> I partially addressed this issue in the V3 patch. Most of the duplicate
> code on sending path is merged.
> The difficulty with translating the buffer to pages is that: I don't
> know how many pages will be translated, and how many struct page I need
> to allocate in advance to hold them. I try to avoid memory allocation
> in the I/O path as much as possible. So I keep two functions of 
> sending data: one for buffer and one for pages.

You do: you'll always need speace for  (len + PAGE_SIZE - 1) >> PAGE_SIZE

That being said: what callers even send you buffers?  In general we
should aim to work with pages for all allocations that aren't tiny.

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