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Date: Wed, 7 Feb 2001 00:21:07 +0000
From: "Stephen C. Tweedie" <sct@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Ben LaHaise <bcrl@redhat.com>, Linus Torvalds <torvalds@transmeta.com>,
        "Stephen C. Tweedie" <sct@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, Ingo Molnar <mingo@redhat.com>
Subject: Re: [Kiobuf-io-devel] RFC: Kernel mechanism: Compound event wait
Message-ID: <20010207002107.L1167@redhat.com>
In-Reply-To: <Pine.LNX.4.30.0102061437250.15204-100000@today.toronto.redhat.com> <Pine.LNX.4.30.0102062052110.8926-100000@elte.hu>
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In-Reply-To: <Pine.LNX.4.30.0102062052110.8926-100000@elte.hu>; from mingo@elte.hu on Tue, Feb 06, 2001 at 08:57:13PM +0100
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Hi,

On Tue, Feb 06, 2001 at 08:57:13PM +0100, Ingo Molnar wrote:
> 
> [overhead of 512-byte bhs in the raw IO code is an artificial problem of
> the raw IO code.]

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.

--Stephen
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