freebsd-dev/contrib/amd/fixmount/fixmount.8

.\"
.\" Copyright (c) 1997-2006 Erez Zadok
.\" Copyright (c) 1990 Jan-Simon Pendry
.\" Copyright (c) 1990 Imperial College of Science, Technology & Medicine
.\" Copyright (c) 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Jan-Simon Pendry at Imperial College, London.
.\"
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.\" modification, are permitted provided that the following conditions
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.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgment:
.\"      This product includes software developed by the University of
.\"      California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" $Id: fixmount.8,v 1.12.2.1 2006/01/02 18:48:25 ezk Exp $
.\" $FreeBSD$
.\"
.Dd January 2, 2006
.Dt FIXMOUNT 8
.Os
.Sh NAME
.Nm fixmount
.Nd fix remote mount entries
.Sh SYNOPSIS
.Nm
.Op Fl adervq
.Op Fl h Ar name
.Ar host ...
.Sh DESCRIPTION
The
.Nm
utility
is a variant of
.Xr showmount 8
that can delete bogus mount entries in remote
.Xr mountd 8
daemons.
The actions specified by the options are performed for each
.Ar host
in turn.
.Sh OPTIONS
.Bl -tag -width indent
.It Fl a , d , e
These options work as in
.Xr showmount 8
except that only entries pertaining to the local host are printed.
.It Fl r
Removes those remote mount entries on
.Ar host
that do not correspond to current mounts, i.e., which are left-over
from a crash or are the result of improper mount protocol.
The actuality of mounts is verified using the entries in
.Pa /etc/mtab .
.It Fl v
Verify remote mounts.
Similar to
.Fl r
except that only a notification message is printed for each bogus entry
found.
The remote mount table is not changed.
.It Fl A
Issues a command to the remote mountd declaring that
.Em all
of its file systems have been unmounted.
This should be used with caution, as it removes all
remote mount entries pertaining to the local system, whether or not any
file systems are still mounted locally.
.It Fl q
Be quiet.
Suppresses error messages due to timeouts and
.Dq Li "Program not registered" ,
i.e., due to remote hosts not supporting RPC or not running
.Xr mountd 8 .
.It Fl h Ar name
Pretend the local hostname is
.Ar name .
This is useful after the local hostname has been changed and rmtab entries
using the old name remain on a remote machine.
Unfortunately, most mountd's will not be able to successfully handle removal
of such entries, so this option is useful in combination with
.Fl v
only.
.Pp
This option also saves time as comparisons of remotely recorded and local
hostnames by address are avoided.
.El
.Sh FILES
.Bl -tag -width ".Pa /etc/rmtab"
.It Pa /etc/mtab
List of current mounts.
.It Pa /etc/rmtab
Backup file for remote mount entries on
.Tn NFS
server.
.El
.Sh SEE ALSO
.Xr mtab 5 ,
.Xr rmtab 5 ,
.Xr mountd 8 ,
.Xr showmount 8
.Pp
.Dq am-utils
.Xr info 1
entry.
.Rs
.%A Erez Zadok
.%B "Linux NFS and Automounter Administration"
.%O ISBN 0-7821-2739-8
.%I Sybex
.%D 2001
.Re
.Pp
.Pa http://www.am-utils.org/
.Rs
.%T Amd \- The 4.4 BSD Automounter
.Re
.Sh HISTORY
The
.Nm
utility appeared in
.Fx 3.0 .
.Sh AUTHORS
.An Jan-Simon Pendry Aq jsp@doc.ic.ac.uk ,
Department of Computing, Imperial College, London, UK.
.Pp
.An Erez Zadok Aq ezk@cs.columbia.edu ,
Department of Computer Science, Columbia University, New York, USA.
.Pp
.An Other authors and contributors to
.Nm am-utils
are listed in the
.Pa AUTHORS
file distributed with
.Nm am-utils .
.Sh AUTHORS
.An Andreas Stolcke Aq stolcke@icsi.berkeley.edu
.Pp
.An Erez Zadok Aq ezk@cs.sunysb.edu ,
Computer Science Department, Stony Brook University, Stony Brook, New York, USA.
.Pp
Other authors and contributors to am-utils are listed in the
.Pa AUTHORS
file distributed with am-utils.
.Sh BUGS
No attempt is made to verify the information in
.Pa /etc/mtab
itself.
.Pp
Since swap file mounts are not recorded in
.Pa /etc/mtab ,
a heuristic specific to SunOS is used to determine whether such a mount
is actual (replacing the string
.Dq Li swap
with
.Dq Li root
and verifying the resulting path).
.Pp
Symbolic links on the server will cause the path in the remote entry to differ
from the one in
.Pa /etc/mtab .
To catch those cases, a file system is also deemed mounted if its
.Em local
mount point is identical to the remote entry.
I.e., on a SunOS diskless client,
.Pa server:/export/share/sunos.4.1.1
is actually
.Pa /usr/share .
Since the local mount point is
.Pa /usr/share
as well this will be handled correctly.
.Pp
There is no way to clear a stale entry in a remote
.Xr mountd 8
after the
local hostname (or whatever reverse name resolution returns for it)
has been changed.
To take care of these cases,
the remote
.Pa /etc/rmtab
file has to be edited and
.Xr mountd 8
restarted.
.Pp
The RPC timeouts for
.Xr mountd 8
calls can only be changed by recompiling.
The defaults are 2 seconds for client handle creation and 5 seconds for
RPC calls.