1 #!/sbin/sh
   2 #
   3 # CDDL HEADER START
   4 #
   5 # The contents of this file are subject to the terms of the
   6 # Common Development and Distribution License, Version 1.0 only
   7 # (the "License").  You may not use this file except in compliance
   8 # with the License.
   9 #
  10 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  11 # or http://www.opensolaris.org/os/licensing.
  12 # See the License for the specific language governing permissions
  13 # and limitations under the License.
  14 #
  15 # When distributing Covered Code, include this CDDL HEADER in each
  16 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  17 # If applicable, add the following below this CDDL HEADER, with the
  18 # fields enclosed by brackets "[]" replaced with your own identifying
  19 # information: Portions Copyright [yyyy] [name of copyright owner]
  20 #
  21 # CDDL HEADER END
  22 #
  23 #
  24 # Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  25 # Use is subject to license terms.
  26 #
  27 # Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
  28 # All rights reserved.
  29 #
  30 #
  31 #ident  "%Z%%M% %I%     %E% SMI"
  32 
  33 # Set noinuse checking during boot. We want to disable device in use checking
  34 # so that normal swap use, such as specified in /etc/vfstab, will not cause
  35 # swap devices to fail to be configured during boot.
  36 NOINUSE_CHECK=1; export NOINUSE_CHECK
  37 
  38 PATH=/usr/sbin:/usr/bin; export PATH
  39 USAGE="Usage: swapadd [-12] [file_system_table]"
  40 
  41 VFSTAB=/etc/vfstab      # Default file system table
  42 PASS=2                  # Default to checking for existing swap
  43 
  44 #
  45 # Check to see if there is an entry in the fstab for a specified file and
  46 # mount it.  This allows swap files (e.g. nfs files) to be mounted before
  47 # being added for swap.
  48 #
  49 checkmount()
  50 {
  51         while read rspecial rfsckdev rmountp rfstype rfsckpass rautomnt rmntopts
  52         do
  53                 #
  54                 # Ignore comments, empty lines, and no-action lines
  55                 #
  56                 case "$rspecial" in
  57                 '#'* | '' | '-') continue ;;
  58                 esac
  59 
  60                 if [ "x$rmountp" = "x$1" ]; then
  61                         #
  62                         # If mount options are '-', default to 'rw'
  63                         #
  64                         [ "x$rmntopts" = x- ] && rmntopts=rw
  65 
  66                         if /sbin/mount -m -o $rmntopts $rspecial \
  67                             >/dev/null 2>&1; then
  68                                 echo "Mounting $rmountp for swap"
  69                         else
  70                                 echo "Mount of $rmountp for swap failed"
  71                         fi
  72                         return
  73                 fi
  74         done <$VFSTAB
  75 }
  76 
  77 die()
  78 {
  79         echo "$*" >& 2
  80         exit 1
  81 }
  82 
  83 while getopts 12 opt; do
  84         case "$opt" in
  85         1|2) PASS=$opt ;;
  86          \?) die "$USAGE" ;;
  87         esac
  88 done
  89 shift `expr $OPTIND - 1`
  90 
  91 [ $# -gt 1 ] && die "$USAGE"
  92 [ $# -gt 0 ] && VFSTAB="$1"
  93 
  94 #
  95 # If $VFSTAB is not "-" (stdin), re-open stdin as the specified file
  96 #
  97 if [ "x$VFSTAB" != x- ]; then
  98         [ -s "$VFSTAB" ] || die "swapadd: file system table ($VFSTAB) not found"
  99         exec <$VFSTAB
 100 fi
 101 
 102 #
 103 # Read the file system table to find entries of file system type "swap".
 104 # Add the swap device or file specified in the first column.
 105 #
 106 while read special t1 t2 fstype t3 t4 t5; do
 107         #
 108         # Ignore comments, empty lines, and no-action lines
 109         #
 110         case "$special" in
 111         '#'* | '' | '-') continue ;;
 112         esac
 113 
 114         #
 115         # Ignore non-swap fstypes
 116         #
 117         [ "$fstype" != swap ] && continue
 118 
 119         if [ $PASS = 1 ]; then
 120                 #
 121                 # Pass 1 should handle adding the swap files that
 122                 # are accessable immediately; block devices, files
 123                 # in / and /usr, and direct nfs mounted files.
 124                 #
 125                 if [ ! -b $special ]; then
 126                         #
 127                         # Read the file system table searching for mountpoints
 128                         # matching the swap file about to be added.
 129                         #
 130                         # NB: This won't work correctly if the file to added
 131                         # for swapping is a sub-directory of the mountpoint.
 132                         # e.g.  swapfile-> servername:/export/swap/clientname
 133                         #       mountpoint-> servername:/export/swap
 134                         #
 135                         checkmount $special
 136                 fi
 137                 if [ -f $special -a -w $special -o -b $special ]; then
 138                         swap -$PASS -a $special >/dev/null
 139                 fi
 140         else
 141                 #
 142                 # Pass 2 should skip all the swap already added.  If something
 143                 # added earlier uses the same name as something to be added
 144                 # later, the following test won't work. This should only happen
 145                 # if parts of a particular swap file are added or deleted by
 146                 # hand between invocations.
 147                 #
 148                 swap -l 2>/dev/null | grep -q "^$special " \
 149                     || swap -$PASS -a $special >/dev/null
 150         fi
 151 done