From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?B?SsO2cm4=?= Engel <joern@logfs.org>
Subject: Re: Proposal to improve filesystem/block snapshot interaction
Date: Tue, 30 Oct 2007 16:37:08 +0100
Message-ID: <20071030153707.GC13455@lazybastard.org>
References: <20070927063113.GD2989@sgi.com> <200710301115.30376.arnd@arndb.de> <7fe698080710300349x5df5d9b9kb3bd69a3077940bc@mail.gmail.com> <200710301338.56592.arnd@arndb.de> <7fe698080710300719ne3ff2b0wb4ebd8ffd75a288a@mail.gmail.com>
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Cc: Arnd Bergmann <arnd@arndb.de>, Greg Banks <gnb@sgi.com>,
	Linux Filesystem Mailing List <linux-fsdevel@vger.kernel.org>,
	David Chinner <dgc@melbourne.sgi.com>,
	Donald Douwsma <donaldd@melbourne.sgi.com>,
	Christoph Hellwig <hch@infradead.org>,
	Roger Strassburg <rls@sgi.com>, Mark Goodwin <markgw@sgi.com>,
	Brett Jon Grandbois <brettg@melbourne.sgi.com>
To: Dongjun Shin <djshin90@gmail.com>
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	Tue, 30 Oct 2007 11:41:48 -0400
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On Tue, 30 October 2007 23:19:48 +0900, Dongjun Shin wrote:
> On 10/30/07, Arnd Bergmann <arnd@arndb.de> wrote:
> >
> > Not sure. Why shouldn't you be able to reorder the hints provided t=
hat
> > they don't overlap with read/write bios for the same block?
>=20
> You're right. The bios can be reordered if they don't overlap with hi=
nt.

I would keep things simpler.  Bios can be reordered, full stop.  If an
erase and a write overlap, the caller (filesystem?) has to add a
barrier.

J=C3=B6rn

--=20
My second remark is that our intellectual powers are rather geared to
master static relations and that our powers to visualize processes
evolving in time are relatively poorly developed.
-- Edsger W. Dijkstra
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