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Date: Tue, 6 Feb 2001 19:25:19 -0500 (EST)
From: Ingo Molnar <mingo@redhat.com>
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To: "Stephen C. Tweedie" <sct@redhat.com>
cc: Ingo Molnar <mingo@elte.hu>, Ben LaHaise <bcrl@redhat.com>,
        Linus Torvalds <torvalds@transmeta.com>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>,
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        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 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.

	Ingo

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