linux-ext4 - Re: [PATCH] default max mount count to unused

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Message-ID: <20100122012929.GA21263@thunk.org>
Date:	Thu, 21 Jan 2010 20:29:29 -0500
From:	tytso@....edu
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	ext4 development <linux-ext4@...r.kernel.org>,
	Bill Nottingham <notting@...hat.com>
Subject: Re: [PATCH] default max mount count to unused

On Wed, Jan 20, 2010 at 04:37:25PM -0600, Eric Sandeen wrote:
> From: Bill Nottingham <notting@...hat.com>
> 
> Anaconda has been setting the max mount count on the root fs
> to -1 (unused) for ages.
> 
> I (Eric) tend to agree that using mount count as a proxy for potential
> for corruption seems odd.  And waiting for fsck on a reboot just because
> it's number 20 (or so) is painful.  Can we just turn it off by default?
> 
> I wouldn't mind killing the periodic check as well, but consider
> this a trial balloon.  :)

I think it would be better to make this be something tunable via
mke2fs.conf.  And as a profile option, maybe we would want this to be
something where we periodically force a full fsck check and then send
TRIM commands down to the SSD.  Given the size and speed of SSD's,
doing periodic TRIM's every N mounts mike actually be a good thing.
(It's dangerous to do a TRIM without doing a full fsck since if the
block allocation bitmap isn't quite right, the user could lose data.)

      		 	      	    	       - Ted
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