From: Eric Sandeen <sandeen@redhat.com>
To: Tomasz Chmielewski <mangoo@wpkg.org>, linux-ext4@vger.kernel.org
Subject: Re: tune2fs and setting noatime as a default mount options
Date: Fri, 29 Aug 2014 10:33:05 -0500 [thread overview]
Message-ID: <54009D31.70703@redhat.com> (raw)
In-Reply-To: <16b17d3bf6a5952c3f20a8644be22c58@admin.virtall.com>
On 8/28/14, 5:12 PM, Tomasz Chmielewski wrote:
> I'd like to set noatime as a default mount option for a filesystem:
>
> # tune2fs -o noatime /dev/sdb1
> tune2fs 1.42.9 (4-Feb-2014)
> Invalid mount option set: noatime
Right, the manpage doesn't list that as supported under "-o".
> Is there a reason why noatime can't be set as a default mount option? Thinking of all these USB connected devices where it would be handy.
I haven't looked, but I'm guessing it's because noatime is a vfs-level switch, and by the time the ext4 superblock is getting read and processed during mount, that chance has passed.
Just to keep things complicated and confusing ;) there's a different mechanism to do this as well:
# tune2fs -E mount_opts=noatime /dev/sdc1
which succeeds; however, this fails to be parsed at mount time:
[ 118.384020] EXT4-fs (sdc1): failed to parse options in superblock: noatime
for the same reasons, I guess. The documentation could certainly be better...
-Eric
next prev parent reply other threads:[~2014-08-29 15:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-28 22:12 tune2fs and setting noatime as a default mount options Tomasz Chmielewski
2014-08-29 15:33 ` Eric Sandeen [this message]
2014-08-29 22:56 ` Theodore Ts'o
2014-09-01 21:23 ` Andy Lutomirski
2014-09-02 3:36 ` Theodore Ts'o
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