[gentoo-user] weirdness with the mounting of /

[gentoo-user] weirdness with the mounting of /

[Doug Hunley]

I'm having some weirdness with my '/' mount. Here's the line from /etc/fstab:
douglas ~ # grep 'md3' /etc/fstab
/dev/md3  /  ext4 noatime,journal_checksum,defaults       0   1

Yet, the output of mount shows:
douglas ~ # mount
rootfs on / type rootfs (rw)
/dev/root on / type ext4 (rw,noatime,barrier=1,data=ordered)

As you can see, it doesn't show journal_checksum as being one of the
mount options nor does it show noatime. Why? For that matter, why is
it listed as 'rootfs' *and* '/dev/root' and not '/dev/md3' ?

My grub config:
kernel /boot/vmlinuz-2.6.30-gentoo-r1 root=/dev/md3 rootfstype=ext4

Thanks in advance for cluebatting me.

-- 
Douglas J Hunley - doug@hunley.homeip.net
http://douglasjhunley.com
Twitter: @hunleyd

Re: [gentoo-user] weirdness with the mounting of /

[Paul Hartman]

On Fri, Jun 12, 2009 at 11:28 AM, Doug Hunley<doug@hunley.homeip.net> wrote:
> I'm having some weirdness with my '/' mount. Here's the line from /etc/fstab:
> douglas ~ # grep 'md3' /etc/fstab
> /dev/md3  /  ext4 noatime,journal_checksum,defaults       0   1
>
> Yet, the output of mount shows:
> douglas ~ # mount
> rootfs on / type rootfs (rw)
> /dev/root on / type ext4 (rw,noatime,barrier=1,data=ordered)
>
> As you can see, it doesn't show journal_checksum as being one of the
> mount options nor does it show noatime. Why? For that matter, why is
> it listed as 'rootfs' *and* '/dev/root' and not '/dev/md3' ?
>
> My grub config:
> kernel /boot/vmlinuz-2.6.30-gentoo-r1 root=/dev/md3 rootfstype=ext4
>
> Thanks in advance for cluebatting me.

I think your root is mounted before fstab comes into play... You may
want to look into the "rootflags" option in your grub kernel
commandline for passing the mount options for your root partition.

[gentoo-user] Re: weirdness with the mounting of /

[Doug Hunley]

On Fri, Jun 12, 2009 at 12:41, Paul
Hartman<paul.hartman+gentoo@gmail.com> wrote:
>
> I think your root is mounted before fstab comes into play... You may
> want to look into the "rootflags" option in your grub kernel
> commandline for passing the mount options for your root partition.
>

That jives with what I'm (slowly) finding on Google as well. It seems
the kernel uses /dev/root when the rootfs is RO. Apparently an initrd
would solve this. Grr...


-- 
Douglas J Hunley - doug@hunley.homeip.net
http://douglasjhunley.com
Twitter: @hunleyd

[gentoo-user] Re: weirdness with the mounting of /

[Nikos Chantziaras]

On 06/12/2009 07:44 PM, Doug Hunley wrote:
> On Fri, Jun 12, 2009 at 12:41, Paul
> Hartman<paul.hartman+gentoo@gmail.com>  wrote:
>> I think your root is mounted before fstab comes into play... You may
>> want to look into the "rootflags" option in your grub kernel
>> commandline for passing the mount options for your root partition.
>>
>
> That jives with what I'm (slowly) finding on Google as well. It seems
> the kernel uses /dev/root when the rootfs is RO. Apparently an initrd
> would solve this. Grr...

It is remounted rw after the fschk using fstab options.  If you change 
the options, you'll see they will apply (why would noatime apply otherwise.)

You don't need an initrd.