remount problem - device busy

[Geert Hendrickx]

On Thu, Nov 30, 2006 at 11:14:53PM +0100, Vladimir Mitiouchev wrote:
> On 11/30/06, Victor Balada Diaz <victor at bsdes.net> wrote:
> >I can't reproduce it, i remount the filesystems
> >as ro and then as rw
> >without problems. Can you reproduce the problem
> >at will? if yes, could
> >you say exactly how are you doing it?
> Interesting - when i umount fs i'm able to mount it rw. I can't
> remount rw mounted partition. Try this:
> Mount /a ro on boot, i mean set read-only in fstab
> Same with /a/b and /a/c.
> Try to remount /a/b rw with mount -rw /a/b.
> No processes in /a/b, no open files.

Use "mount -u" to re-mount an already-mounted fs with different options.
e.g. mount -u -rw /a/b.  / is an exception to this, apparantly.

	Geert