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udev-179 - /dev/root gone, which partition mounted on /
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nomadicME
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PostPosted: Mon Feb 04, 2013 11:38 pm    Post subject: udev-179 - /dev/root gone, which partition mounted on / Reply with quote

used to do:

# ls /dev/root

and there it was, a symlink showing which partition was mounted on /

OK, times change. What other methods are available for checking which partition is mounted on / ?

# mount

does not work. Strangely, it still reports /dev/root is mounted on / ???

Thanks
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jrussia
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PostPosted: Mon Feb 04, 2013 11:48 pm    Post subject: Reply with quote

blkid -o list
lsblk
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nomadicME
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PostPosted: Tue Feb 05, 2013 12:06 am    Post subject: Reply with quote

sweet !!!

lsblk is even shorter than my old method

Any ideas on why mount still shows /dev/root mounted on / ?
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jrussia
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PostPosted: Tue Feb 05, 2013 12:21 am    Post subject: Reply with quote

Good question, but I don't have an answer for it. :) Probably something early in the init process that I don't understand.
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dekeonus
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PostPosted: Thu Feb 14, 2013 8:11 pm    Post subject: Reply with quote

I'd like to know why /dev/root symlink is gone and that the init scripts still manage to mount /dev/root because it causes quotacheck to fail to check the root filesystem o.O
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ssuominen
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PostPosted: Thu Feb 14, 2013 8:24 pm    Post subject: Reply with quote

dekeonus wrote:
I'd like to know why /dev/root symlink is gone and that the init scripts still manage to mount /dev/root because it causes quotacheck to fail to check the root filesystem o.O


Looks like you may want to CC yourself in this bug:

http://bugs.gentoo.org/show_bug.cgi?id=438028

More of similar:

http://bugs.gentoo.org/show_bug.cgi?id=438380

So, workaround, perhaps in some init script, until quota is fixed:

So if your partition is /dev/sda1 for / you can symlink /dev/sda1 to /dev/root

Like here:

http://blog.wlindley.com/tag/devroot/
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Dr.Willy
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PostPosted: Fri Feb 15, 2013 12:27 pm    Post subject: Reply with quote

jrussia wrote:
blkid -o list
lsblk

mount -vf /
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floppymaster
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PostPosted: Sat Feb 16, 2013 4:56 pm    Post subject: Reply with quote

nomadicME wrote:
Any ideas on why mount still shows /dev/root mounted on / ?

It has to do with the way the kernel mounts the root filesystem when you do not use an initramfs.
It translates the root=/dev/sdXY on the command line to a major and minor device number.
Then it creates a temporary device node with that major and minor number as "/dev/root".
Finally, it mounts the root filesystem using that temporary device node.
This is all done by the code in the "init" folder in the kernel sources.

Ideally, someone would modify the kernel code to use /dev/sdXY as the temporary device node name, but that is probably more work that it seems.
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