On Mon, Nov 04, 2013 at 12:09:12PM +0100, Bernhard Voelker wrote:
> $ ./mount | grep sdb
> /dev/sdb on /home type ext4 (rw,relatime,data=ordered)
> /dev/sdb on /home type ext4 (rw,relatime,data=ordered)
Yes, it seems correct, use findmnt(8) to see what happen. It's more
tricky :-) (or see /proc/self/mountinfo where is Id<->Parent
relationship described by two first columns).
... and don't forget that mounts are propagated in shared trees, so
try to compare:
mkdir /mnt/test
mount --bind /mnt/test /mnt/test
mount --make-private /mnt/test
mount --bind /mnt/test /mnt/test
mount --bind /mnt/test /mnt/test
and:
mount --bind /mnt/test /mnt/test
mount --make-shared /mnt/test
mount --bind /mnt/test /mnt/test
mount --bind /mnt/test /mnt/test
you can also try to mount something else to /mnt/test/A to see what
happen.
> This is probably a kernel bug
I don't think it's bug :-)
>, but as bind mounts to self
> are not that much of use, wouldn't it be worthwhile to
> prohibit it at all in mount(8)?
mount --bind /A /A
is pretty common operation if you want to create a mountpoint
from non-mountpoint directory.
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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