linux-kernel - Re: [PATCH] ext3: Don't update superblock write time when filesystem is read-only

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Message-ID: <20091005145557.GE8388@duck.suse.cz>
Date:	Mon, 5 Oct 2009 16:55:57 +0200
From:	Jan Kara <jack@...e.cz>
To:	Theodore Tso <tytso@....edu>
Cc:	Jan Kara <jack@...e.cz>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	sandeen@...hat.com
Subject: Re: [PATCH] ext3: Don't update superblock write time when
	filesystem is read-only

On Mon 05-10-09 10:01:18, Theodore Tso wrote:
> On Mon, Oct 05, 2009 at 02:24:09PM +0200, Jan Kara wrote:
> > On Sat 03-10-09 23:12:38, Theodore Ts'o wrote:
> > > This avoids updating the superblock write time when we are mounting
> > > the root file system read/only but we need to replay the journal; at
> > > that point, for people who are east of GMT and who make their clock
> > > tick in localtime for Windows bug-for-bug compatibility, and this will
> > > cause e2fsck to complain and force a full file system check.
> >   Thanks, the patch is queued in my queue already. I just held it for a
> > while because Eric also had a valid point - maybe fsck is too strict when
> > it forces a full filesystem check just because the superblock write time is
> > in future? On a pc-class hw, clocks go often wrong. Even I remember setting
> > system clock on my desktop a few hours back because it just gets out of
> > sync and I don't run NTP...
> >   So I'm not against your patch because it can help in some cases and
> > it's not a big deal but I think a proper fix would be in fsck...
> 
> Regardless of whether fsck relaxes its check, if the filesystem is
> mounted read-only, I don't think the last write time should change...
  Yeah, that's also a reasonable argument, although in fact the filesystem
has changed (we replayed the journal) so I can also see a reason to keep
updating it.
  Anyway, as I said above, I'm not against the patch. I'll push it to Linus
this week.

									Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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