linux-kernel - Re: Linux 2.6.29

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Message-ID: <49D03621.5080501@rtr.ca>
Date:	Sun, 29 Mar 2009 23:01:53 -0400
From:	Mark Lord <lkml@....ca>
To:	Stefan Richter <stefanr@...6.in-berlin.de>,
	Jeff Garzik <jeff@...zik.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

Dave Chinner wrote:
> On Sat, Mar 28, 2009 at 11:17:08AM -0400, Mark Lord wrote:
>> The better solution seems to be the rather obvious one:
>>
>>   the filesystem should commit data to disk before altering metadata.
> 
> Generalities are bad. For example:
> 
> write();
> unlink();
> <do more stuff>
> close();
> 
> This is a clear case where you want metadata changed before data is
> committed to disk. In many cases, you don't even want the data to
> hit the disk here.
..

Err, no actually.  I want a consistent disk state,
either all old or all new data after a crash.

Not loss of BOTH new and old data.

And the example above is trying to show, what??
Looks like a temporary file case, except the code
is buggy and should be doing the unlink() before
the write() call.

But thanks for looking at this stuff!
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