LinuxQuestions.org - A work-around for reboot/shutdown problems when cifs shares are open

In Fedora, when a reboot or shutdown is done, and if a cifs share is open, the network access may be terminated before the CIFS filesystems are unmounted. This produces an inordinate delay as each share must wait for it's umount request to time out.

Since I set up my cifs shares for automount with no timeout, I needed an automatic way to unmount them at the start of a reboot or shutdown.

The solution I took was to patch the stop function in /etc/init.d/dhcdbd to include the following code:

Code:

# Un-mount CIFS shares if there are any CIFS processes running

        if ! [ -z $(/sbin/pidof cifsd) ];

        then

            echo -n Umounting SMB shares;

            umount -a -t cifs

            if [ $? -eq 0 ];

            then

                success;

            else

                failure;

            fi

            echo

        fi

#

This is, of course, a "hack." A better solution might be to create a cifs program in in /etc/init.d/ and link to it from /etc/rc.d/rc5.d/ so that it's run before dhcdbd at shutdown. Something like this (which I've not tested):

Code:

$ cat tmp/cifs

#!/bin/bash

#

#  cifs:        Make sure that all cifs shares are unmounted before INIT 0

#

#  description: This is a pseudo init process that umounts any cifs shares

#              that are open when it's called

#

#  processname: cifs

#

. /etc/rc.d/init.d/functions

[ -e /etc/sysconfig/network ] && . /etc/sysconfig/network

[ "${NETWORKING}" = "no" ] && exit 0

prog=cifs



stop () {

# Un-mount CIFS shares if there are any CIFS processes running

        RETVAL=0

        if ! [ -z $(/sbin/pidof cifsd) ];

        then

            echo -n Umounting cifs shares:

            umount -a -t cifs

            RETVAL=$?

            if [ $RETVAL -eq 0 ];

            then

                success;

            else

                failure;

            fi

            echo

        fi

        return $RETVAL

}



status() {

# Report if any CIFS processes is running

        RETVAL=0

        if ! [ -z $(/sbin/pidof cifsd) ];

        then

          echo The CIFS process is running.

        else

          echo The CIFS process is not running.

        fi

        return $RETVAL

}



case "$1" in

    stop)

        stop;

        RETVAL=$?;

        ;;

    status)

        status;

        RETVAL=$?;

        ;;

    *)

# Just ignore any other arguments

        RETVAL=0;

        ;;

esac;



exit $RETVAL;

As an aside, for those who want to use automount for their cifs shares, here's my /etc/auto.master and /etc/auto.cifs:

Code:

$ cat /etc/auto.master

/smb    /etc/auto.cifs --timeout=0

+auto.master

$ cat /etc/auto.cifs

#!/bin/bash

credfile="/etc/auto.smb.$key"

mountopts="-fstype=cifs,file_mode=0775,dir_mode=0775,uid=$USER,gid=smb"

smbclientopts=""

SMBCLIENT=$(whereis -b smbclient | cut -d " " -f 2)

if ! [ -x $SMBCLIENT ]

then

    echo No smbclient executable found. Have you installed samba? >2

    exit 1

fi

if [ -r "$credfile" ]

then

        mountopts=$mountopts",credentials=$credfile"

        smbclientopts="-A "$credfile

else

        smbclientopts="-N"

fi

$SMBCLIENT $smbclientopts -gL $key\

  | awk -v key="$key" -v opts="$mountopts" -F'|' -- '

        BEGIN  { ORS=""; first=1 }

        /^Disk[^$]*$/  { if (first) { print opts; first=0 };

                  sub(/ /, "\\ ", $2);

                  if (length($2)==1) sub(/ ^/, "", $2);

                  print " \\\n\t /" tolower($2), "://" key "/" $2 }

        END    { if (!first) print "\n"; else exit 1 }

        '