linux-ext4 - Re: [PATCH 3/3] Add timeout feature

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Date:	Wed, 09 Jul 2008 14:59:20 +0200
From:	Olaf Frączyk <olaf@....poznan.pl>
To:	Theodore Tso <tytso@....edu>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	Miklos Szeredi <miklos@...redi.hu>, hch@...radead.org,
	pavel@...e.cz, t-sato@...jp.nec.com, akpm@...ux-foundation.org,
	viro@...IV.linux.org.uk, linux-ext4@...r.kernel.org,
	xfs@....sgi.com, dm-devel@...hat.com,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	axboe@...nel.dk, mtk.manpages@...glemail.com
Subject: Re: [PATCH 3/3] Add timeout feature

On Wed, 2008-07-09 at 08:24 -0400, Theodore Tso wrote:
> On Wed, Jul 09, 2008 at 09:49:58PM +1000, Dave Chinner wrote:
> > (e) none of the above.  The kernel compilation will appear to pause
> > until the filesystem is unfrozen. No other visible effect should
> > occur. It will get blocked in a write or filesystem transaction
> > because the fs is frozen.
> 
> So if the process which froze the filesystem accidentally tries
> writing to a log file (or database file containing the backup
> information, or whatever) that happens to be on the filesystem that is
> frozen, that process will get blocked and you end up in a deadlock;
> did I get that right?
Where do you see the deadlock?
The process doesn't have a lock on filesystem or something. You can
always unfreeze from another process.

Regards,

Olaf
-- 
Olaf Frączyk <olaf@....poznan.pl>

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