multiple of sector size I/O restriction

Greg 'groggy' Lehey grog at FreeBSD.org
Sun Apr 23 23:31:08 UTC 2006


On Sunday, 23 April 2006 at 18:10:50 +0200, Poul-Henning Kamp wrote:
> In message <20060423175605.35a26523.jylefort at FreeBSD.org>, Jean-Yves Lefort writes:
>>
>> I've found some linux code which reads from a raw cd device in
>> non-multiples of the sector size; I imagine that this code works on
>> linux. This leads me to think that it is possible to overcome the
>> hardware limitation by software means. Am I right?
>
> Yes, the linux kernel does not give access to the raw disks, you
> always have to pass though their buffer cache.

s/always //

There are ways to bypass buffer cache in Linux.  They're not pretty.

Greg
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