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Date:      Tue, 1 Oct 2002 23:38:48 +0200
From:      Pawel Jakub Dawidek <nick@garage.freebsd.pl>
To:        freebsd-hackers@freebsd.org
Subject:   Getfsstat(2), statfs(2) and fstatfs(2) jailed.
Message-ID:  <20021001213848.GK19012@garage.freebsd.pl>

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Hello hackers...

	http://garage.freebsd.pl/jailfsstat.tgz
	http://garage.freebsd.pl/jailfsstat.README

With this kernel module for FreeBSD 4.x process in jail can see only
file systems that are mounted in jail's chroot directory.

For example if we have mounted:

	FN FP
	1  /
	2  /bin
	3  /sbin
	4  /usr
	5  /jails
	6  /jails/prison/etc
	7  /jails/prison/bin
	8  /jails/prison/sbin
	9  /jails/prison/usr

	FN - file system number
	FP - file system path

and now we calling jail(2) with path /jails/prison.
If we check mounted file systems inside of jail we got:

	FN FP
	5  /
	6  /etc
	7  /bin
	8  /sbin
	9  /usr

Now getfsstat(2) returns only file systems that are in chroot
directory with cuted path names. "/" is file system where
chroot directory is mounted on.
Statfs(2) and fstatfs(2) also returns cuted paths.

Why this isn't a part of jail(2) implementation?
Maybe I'm missing something?

--=20
Pawel Jakub Dawidek
UNIX Systems Administrator
http://garage.freebsd.pl
Am I Evil? Yes, I Am.

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