Re: [PATCH 3/5] pagemap: Make pagemap_read enforce reading in multiples of 8

[Thomas Tuttle]

On Thu, Jun 5, 2008 at 12:03 PM, Matt Mackall <mpm@xxxxxxxxxxx> wrote:
>
> On Thu, 2008-06-05 at 11:06 -0400, Thomas Tuttle wrote:
>> Since kpagecount and kpageflags require reads in multiples of 8, and
>> it simplifies add_to_pagemap significantly, I added the same
>> requirement to /proc/pid/pagemap.
>
> I'm generally fine with this. Another approach that's perhaps more
> friendly is when someone tries to do a 24-byte read, do a 16-byte read,
> leaving the file pointer aligned. Not sure if that's completely kosher
> though.

This doesn't require that they read exactly 8 bytes, just that they
read some multiple of 8 bytes.  (They can read 8, 16, 24, etc..., just
not something like 12.)

--ttuttle
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