Date: Thu, 25 Jun 1998 03:50:52 +0900 (JST)
From: amakawa@sf.t.u-tokyo.ac.jp
To: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: conf/7054: bad default value of ${fs} for type:=host in /etc/amd.map
Message-ID: <199806241850.DAA00894@nebula.sf.t.u-tokyo.ac.jp>
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>Number: 7054
>Category: conf
>Synopsis: bad default value of ${fs} for type:=host in /etc/amd.map
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Wed Jun 24 12:00:01 PDT 1998
>Last-Modified:
>Originator: Amakawa Shuhei
>Organization:
Univ. of Tokyo
>Release: FreeBSD 2.2.6-RELEASE i386
>Environment:
FreeBSD 2.2.6-RELEASE i386
>Description:
The default value of ${fs} for type:=host given in /etc/amd.map
causes clash between the mount tree for network host file system
(type:=host) and that for network filesystem (type:=nfs).
>How-To-Repeat:
Suppose `ns' is an NFS server, exporting `/export/usr'.
Use the following map for `/amnt'.
-----------------------------------------------------------------
tmp type:=nfs;rhost:=ns;rfs:=/export/usr/tmp
-----------------------------------------------------------------
Then you can access `ns:/export/usr/tmp' via `/amnt/tmp' and
`/host/ns/export/usr/tmp'.
Now, do the following.
% cd /amnt/tmp
% df .
Filesystem 1K-blocks Used Avail Capacity Mounted on
ns:/export/usr/tmp 3945840 2096272 1770652 54% /a/ns/export/usr/tmp
~~~~~~~~~~~~~~~~~~~~
OK.
% cd /host/ns/export/usr/tmp
% df .
Filesystem 1K-blocks Used Avail Capacity Mounted on
ns:/export/usr/tmp 3945840 2096272 1770652 54% /a/ns/export/usr
~~~~~~~~~~~~~~~~
This means
/amnt/tmp is shadowed.
% cd /amnt/tmp
% df .
Filesystem 1K-blocks Used Avail Capacity Mounted on
ns:/export/usr/tmp 3945840 2096272 1770652 54% /a/ns/export/usr
~~~~~~~~~~~~~~~~
Shadowed indeed.
% amq -u /amnt/tmp
% amq -u /host/ns
% cd /amnt/tmp
/amnt/tmp: No such file or directory.
Ugh!
>Fix:
I suggest `/host' be appended to fs because this map is used for
the network *host* filesystem (type:=host). The clash can be thus
avoided. Note that the manual page (info amd) suggests
"fs:=${autodir}/${rhost}/root", but the same suggestion is given
for the network group filesystem (type:=nfsx). So I suppose the
better solution is to use "fs:=${autodir}/${rhost}/host" for
type:=host and "fs:=${autodir}/${rhost}/nfsx" for type:=nfsx.
----8<---- snip ----8<----
*** amd.map.org Mon Jun 15 11:10:29 1998
--- amd.map Thu Jun 25 02:45:59 1998
***************
*** 1,2 ****
! /defaults type:=host;fs:=${autodir}/${rhost};rhost:=${key}
* opts:=rw,grpid,resvport,nfsv2,nosuid,nodev
--- 1,2 ----
! /defaults type:=host;fs:=${autodir}/${rhost}/host;rhost:=${key}
* opts:=rw,grpid,resvport,nfsv2,nosuid,nodev
---->8---- snip ---->8----
>Audit-Trail:
>Unformatted:
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