Re: unmounting ext3/ext2

[Jed Davis <jdev%panix.com@localhost>]

pierre-philipp braun <pbraun%nethence.com@localhost> writes:

> node2# tar xjpf /xendoms/gentoo/stage3-i686-2007.0.tar.bz2 -C /mnt/lili
> node2# fstat | grep '/mnt/lili'
> node2# umount /mnt/lili
> umount: /mnt/lili: Device busy

Are there any device nodes in the tar file?  If this is the problem I
think it is, it's machine-independent and not new: vnodes created by
the bdevvp(9) routine -- e.g., the one from which the root filesystem
is initially mounted -- will be overwritten in place by the first
actual vnode with the same type and device number to be encountered.

Thus, an "ls -l /dev" before unrolling the tar file would likely
prevent the problem, by causing those device nodes to be run through
checkalias(9) first (I think; it's been a while since I last ran into
this.)

I am not at all clear on why *BSD behaves in this way.

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