Date: Tue, 9 Sep 2014 21:48:10 +0200 From: Roland Smith <rsmith@xs4all.nl> To: Dave Babb <dcbdbis@comcast.net> Cc: freebsd-questions@freebsd.org Subject: Re: tmpfs and noatime heads up Message-ID: <20140909194810.GC36353@slackbox.erewhon.home> In-Reply-To: <540E443C.1040702@comcast.net> References: <540E443C.1040702@comcast.net>
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On Mon, Sep 08, 2014 at 06:05:16PM -0600, Dave Babb wrote:
> I added the noatime option to my fstab where the tempfs entries were....
The noatime option is generally meant to cut down on the amount of writes t=
hat
is done to a filesystem. This is only important for HDDs and especially SDD=
s.
Looking at the tmpfs code, it does maintain atime. The driver code checks f=
or
unknown options when mounting and returns EINVAL when a not allowed option =
is found.
See tmpfs_mount() /usr/src/sys/fs/tmpfs/tmpfs_vfsops.c
> FreeBSD didn't like it and dropped me out to single user mode upon
> reboot with the appropriate warning of "invalid mount option".
Presumably that's just a conservative way of handling it.
Does that also happen when you try to mount a tmpfs by hand after booting?
I would guess not.
> I removed the noatime flags for my tempfs entries, rebooted, and all
> came back up as it should be.
>=20
> No harm done.....Just an FYI that the tmpfs (at least on my system)
> doesn't support the noatime flag....
According to the code in /usr/src/sys/fs/tmpfs/tmpfs_vfsops.c, the only
supported options are;
static const char *tmpfs_opts[] =3D {
"from", "size", "maxfilesize", "inodes", "uid", "gid", "mode", =
"export",
"union", NULL
};
> Anyway...an FYI!
You might want to submit this as at least a documentation bug. FreeBSD now
uses bugzilla: https://bugs.freebsd.org/bugzilla/
Roland
--=20
R.F.Smith http://rsmith.home.xs4all.nl/
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