Subject: Re: Union Filesystem
To: Jason R. Fink <jrf@adresearch.com>
From: Konrad Schroder <perseant@hitl.washington.edu>
List: tech-kern
Date: 11/08/2002 16:58:09
On Fri, 8 Nov 2002, Jason R. Fink wrote:
> Filesystem 1K-blocks Used Avail Capacity Mounted on
> /dev/wd0a 2053695 1278178 672832 65% /
> /dev/wd0e 31764068 1745591 28430273 5% /usr
> <above>:/tmp/foo 3799286 3023769 672832 81% /usr/bar
> deimos# touch /tmp/foo/baz
> deimos# touch /usr/bar/buz
> deimos# ls /tmp/foo
> baz buz
> deimos# ls /usr/bar
> baz buz
Both of those files were created in /tmp/foo, and not in the version of
/usr/bar that is "below" the union mount, though the union of (the hidden)
/usr/bar and /tmp/foo contains both. If you do
deimos# umount /usr/bar
deimos# ls /usr/bar
it should come up empty.
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Konrad Schroder http://www.hitl.washington.edu/people/perseant/
Information Tech & Services Box 352142 -or- 215 Fluke Hall, Mason Road
Human Interface Technology Lab University of Washington
Voice: +1.206.616.1478 Fax: +1.206.543.5380 Seattle, WA, 98195, USA