Re: 2.4.19-pre7: rootfs mounted twice

From: Alexander Viro (viro@math.psu.edu)
Date: Fri Apr 26 2002 - 01:32:23 EST


On Fri, 26 Apr 2002, Michael Dreher wrote:

> dreher@karpfen:~ > df
> Filesystem 1k-blocks Used Available Use% Mounted on
> rootfs 7060308 6276188 425472 94% /

df(1) is wrong. There is (see /proc/mounts below) rootfs mounted as
root (ramfs, actually) and ext3 mounted over it. df sees two entries
in /etc/mtab (on your box - /proc/mounts) with mountpoint "/" and
does statfs("/", &buf); for both. Surprise, surprise, results of
two calls of statf2(2) are identical - what with arguments being
the same both times - and refer to the filesystem where your "/"
lives. I.e. to ext3.

> /dev/root 7060308 6276188 425472 94% /
> /dev/hda4 3794936 3042316 559840 84% /home
>
> dreher@karpfen:~ > cat /proc/mounts
> rootfs / rootfs rw 0 0
> /dev/root / ext3 rw,noatime,nodiratime 0 0
> proc /proc proc rw 0 0
> /dev/hda4 /home ext3 rw,noatime,nodiratime 0 0
> usbdevfs /proc/bus/usb usbdevfs rw 0 0
> devpts /dev/pts devpts rw 0 0

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