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Subject: Re: Disk (block) write strangeness
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Jakob Oestergaard <jakob@unthought.net>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20020805184921.GC2671@unthought.net>
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Date: 05 Aug 2002 21:17:12 +0100
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On Mon, 2002-08-05 at 19:49, Jakob Oestergaard wrote:
> *) Either the disk writes backwards  (no I don't believe that)
> *) Or the kernel is writing 256 B blocks (AFAIK it can't)
> *) The disk has some internal magic that cause a power-loss during
>    a full block write to leave the first half of the block intact with
>    old data, and update the second half of a block correctly with new
>    data.  (And I don't believe that either).

You forgot to add

*) or the disk internal logic bears no resemblance to the antiquated API
it fakes for the convenience of interface hardware and software

Linux also won't neccessarily do write outs in order. 

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