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Date: Tue, 6 Feb 2001 16:42:14 -0800 (PST)
From: Linus Torvalds <torvalds@transmeta.com>
To: Ingo Molnar <mingo@redhat.com>
cc: "Stephen C. Tweedie" <sct@redhat.com>, Ingo Molnar <mingo@elte.hu>,
        Ben LaHaise <bcrl@redhat.com>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
        Manfred Spraul <manfred@colorfullife.com>, Steve Lord <lord@sgi.com>,
        Linux Kernel List <linux-kernel@vger.kernel.org>,
        kiobuf-io-devel@lists.sourceforge.net
Subject: Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait
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On Tue, 6 Feb 2001, Ingo Molnar wrote:
> 
> On Wed, 7 Feb 2001, Stephen C. Tweedie wrote:
> 
> > No, it is a problem of the ll_rw_block interface: buffer_heads need to
> > be aligned on disk at a multiple of their buffer size.  Under the Unix
> > raw IO interface it is perfectly legal to begin a 128kB IO at offset
> > 512 bytes into a device.
> 
> then we should either fix this limitation, or the raw IO code should split
> the request up into several, variable-size bhs, so that the range is
> filled out optimally with aligned bhs.

As mentioned, no such limitation exists if you just use the right
interfaces.

		Linus

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