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 (the "License").
7 # You may not use this file except in compliance with the License.
8 #
9 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 # or http://www.opensolaris.org/os/licensing.
11 # See the License for the specific language governing permissions
12 # and limitations under the License.
13 #
14 # When distributing Covered Code, include this CDDL HEADER in each
15 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 # If applicable, add the following below this CDDL HEADER, with the
17 # fields enclosed by brackets "[]" replaced with your own identifying
18 # information: Portions Copyright [yyyy] [name of copyright owner]
19 #
20 # CDDL HEADER END
21 #
22 #
23 # Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 # Use is subject to license terms.
25 #
26 # Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T
27 # All Rights Reserved
28 #
29 #
30
31 usage () {
32 if [ -n "$1" ]; then
33 echo "umountall: $1" 1>&2
34 fi
35 echo "Usage:\n\tumountall [-k] [-s] [-F FSType] [-l|-r] [-Z] [-n]" 1>&2
36 echo "\tumountall [-k] [-s] [-h host] [-Z] [-n]" 1>&2
37 exit 2
38 }
39
40 MNTTAB=/etc/mnttab
41
42 # This script is installed as both /sbin/umountall (as used in some
43 # /sbin/rc? and /etc/init.d scripts) _and_ as /usr/sbin/umountall (typically
44 # PATHed from the command line). As such it should not depend on /usr
45 # being mounted (if /usr is a separate filesystem).
46 #
47 # /sbin/sh Bourne shell builtins we use:
48 # echo
49 # exit
50 # getopts
51 # test, [ ]
52 # exec
53 # read
54 #
55 # /sbin commands we use:
56 # /sbin/uname
57 # /sbin/umount
58 #
59 # The following /usr based commands may be used by this script (depending on
60 # command line options). We will set our PATH to find them, but where they
61 # are not present (eg, if /usr is not mounted) we will catch references to
62 # them via shell functions conditionally defined after option processing
63 # (don't use any of these commands before then).
64 #
65 # Command Command line option and use
66 # /usr/bin/sleep -k, to sleep after an fuser -c -k on the mountpoint
67 # /usr/sbin/fuser -k, to kill processes keeping a mount point busy
68 #
69 # In addition, we use /usr/bin/tail if it is available; if not we use
70 # slower shell constructs to reverse a file.
71
72 PATH=/sbin:/usr/sbin:/usr/bin
73
74 DEFERRED_ACTIVATION_PATCH_FLAG="/var/run/.patch_loopback_mode"
75 SVC_STARTD="/lib/svc/bin/svc.startd"
76
77 # Clear these in case they were already set in our inherited environment.
78 FSType=
79 FFLAG=
80 HOST=
81 HFLAG=
82 RFLAG=
83 LFLAG=
84 SFLAG=
85 KFLAG=
86 ZFLAG=
87 NFLAG=
88 LOCALNAME=
89 UMOUNTFLAG=
90
91
92 while getopts ?rslkF:h:Zn c
93 do
94 case $c in
95 r) RFLAG="r";;
96 l) LFLAG="l";;
97 s) SFLAG="s";;
98 k) KFLAG="k";;
99 h) if [ -n "$HFLAG" ]; then
100 usage "more than one host specified"
101 fi
102 HOST=$OPTARG
103 HFLAG="h"
104 LOCALNAME=`uname -n`
105 ;;
106 F) if [ -n "$FFLAG" ]; then
107 usage "more than one FStype specified"
108 fi
109 FSType=$OPTARG
110 FFLAG="f"
111 case $FSType in
112 ?????????*)
113 usage "FSType ${FSType} exceeds 8 characters"
114 esac;
115 ;;
116 Z) ZFLAG="z";;
117 n) NFLAG="n"
118 # Alias any commands that would perform real actions to
119 # something that tells what action would have been performed
120 UMOUNTFLAG="-V"
121 fuser () {
122 echo "fuser $*" 1>&2
123 }
124 sleep () {
125 : # No need to show where we'd sleep
126 }
127 ;;
128 \?) usage ""
129 ;;
130 esac
131 done
132
133 # Sanity checking:
134 # 1) arguments beyond those supported
135 # 2) can't specify both remote and local
136 # 3) can't specify a host with -r or -l
137 # 4) can't specify a fstype with -h
138 # 5) can't specify this host with -h (checks only uname -n)
139 # 6) can't be fstype nfs and local
140 # 7) only fstype nfs is remote
141
142 if [ $# -ge $OPTIND ]; then # 1
143 usage "additional arguments not supported"
144 fi
145
146 if [ -n "$RFLAG" -a -n "$LFLAG" ]; then # 2
147 usage "options -r and -l are incompatible"
148 fi
149
150 if [ \( -n "$RFLAG" -o -n "$LFLAG" \) -a "$HFLAG" = "h" ]; then # 3
151 usage "option -${RFLAG}${LFLAG} incompatible with -h option"
152 fi
153
154 if [ -n "$FFLAG" -a "$HFLAG" = "h" ]; then # 4
155 usage "Specifying FStype incompatible with -h option"
156 fi
157
158 if [ -n "$HFLAG" -a "$HOST" = "$LOCALNAME" ]; then # 5
159 usage "Specifying local host illegal for -h option"
160 fi
161
162 if [ "$FSType" = "nfs" -a "$LFLAG" = "l" ]; then # 6
163 usage "option -l and FSType nfs are incompatible"
164 fi
165
166 if [ -n "$FFLAG" -a "$FSType" != "nfs" -a -n "$RFLAG" ]; then # 7
167 usage "option -r and FSType ${FSType} are incompatible"
168 fi
169
170 ZONENAME=`zonename`
171
172 # Check and if needed sync the boot archive before unmounting everything.
173 #
174 if [ -z "${RFLAG}${NFLAG}${HFLAG}${FSType}" -a "$ZONENAME" = "global" \
175 -a -x /sbin/bootadm ] ; then
176 /sbin/bootadm -a update_all
177 fi
178
179
180 #
181 # If we are in deferred activation patching, and the caller is
182 # svc.startd, then exit without unmounting any of the remaining
183 # file systems since the call path is from shutdown. Note that
184 # by the time we get here, smf stop methods for nfs, cachefs
185 # etc, will have run.
186 #
187 if [ -f $DEFERRED_ACTIVATION_PATCH_FLAG ] ; then
188 ppid=`ps -o ppid= -p $$` # parent of umountall will be sh
189 # from system()
190
191 ppid=`ps -o ppid= -p $ppid` # parent of sh will be svc.startd
192 COMM=`ps -o comm= -p $ppid`
193 if [ "$COMM" = "$SVC_STARTD" ] ; then
194 exit
195 fi
196 fi
197
198 #
199 # Take advantage of parallel unmounting at this point if we have no
200 # criteria to match and we are in the global zone
201 #
202 if [ -z "${SFLAG}${LFLAG}${RFLAG}${HFLAG}${KFLAG}${FFLAG}${ZFLAG}" -a \
203 "$ZONENAME" = "global" ]; then
204 umount -a ${UMOUNTFLAG}
205 exit # with return code of the umount -a
206 fi
207
208 #
209 # Catch uses of /usr commands when /usr is not mounted
210 if [ -n "$KFLAG" -a -z "$NFLAG" ]; then
211 if [ ! -x /usr/sbin/fuser ]; then
212 fuser () {
213 echo "umountall: fuser -k skipped (no /usr)" 1>&2
214 # continue - not fatal
215 }
216 sleep () {
217 : # no point in sleeping if fuser is doing nothing
218 }
219 else
220 if [ ! -x /usr/bin/sleep ]; then
221 sleep () {
222 echo "umountall: sleep after fuser -k skipped (no /usr)" 1>&2
223 # continue - not fatal
224 }
225 fi
226 fi
227 fi
228
229 #
230 # Shell function to avoid using /usr/bin/cut. Given a dev from a
231 # fstype=nfs line in mnttab (eg, "host:/export) extract the host
232 # component.
233 print_host () {
234 OIFS=$IFS
235 IFS=":"
236 set -- $*
237 echo $1
238 IFS=$OIFS
239 }
240
241 #
242 # doumounts echos its return code to stdout, so commands used within
243 # this function should take care to produce no other output to stdout.
244 doumounts () {
245 (
246 rc=0
247 fslist=""
248 nfslist=""
249 while read dev mountp fstype mode dummy
250 do
251 case "${mountp}" in
252 / | \
253 /dev | \
254 /dev/fd | \
255 /devices | \
256 /etc/mnttab | \
257 /etc/svc/volatile | \
258 /lib | \
259 /proc | \
260 /sbin | \
261 /system/contract | \
262 /system/object | \
263 /tmp | \
264 /usr | \
265 /var | \
266 /var/adm | \
267 /var/run | \
268 '' )
269 #
270 # file systems possibly mounted in the kernel or
271 # in the methods of some of the file system
272 # services
273 #
274 continue
275 ;;
276 * )
277 if [ -n "$HFLAG" ]; then
278 if [ "$fstype" = "nfs" ]; then
279 thishost=`print_host $dev`
280 if [ "$HOST" != "$thishost" ]; then
281 continue
282 fi
283 else
284 continue
285 fi
286 fi
287 if [ -n "$FFLAG" -a "$FSType" != "$fstype" ]; then
288 continue
289 fi
290 if [ -n "$LFLAG" -a "$fstype" = "nfs" ]; then
291 nfslist="$nfslist $mountp"
292 continue
293 fi
294 #
295 # This will filter out autofs mounts with nfs file
296 # system mounted on the top of it.
297 #
298 # WARNING: use of any syscall on a NFS file system has
299 # the danger to go over-the-wire and could cause nfs
300 # clients to hang on shutdown, if the nfs server is
301 # down beforehand.
302 # For the reason described above, a simple test like
303 # "df -F nfs $mountp" can't be used to filter out
304 # nfs-over-autofs mounts. We loop over a list instead:
305 #
306 if [ -n "$LFLAG" -a -n "$nfslist" -a "$fstype" = "autofs" ]
307 then
308 for m in $nfslist; do
309 if [ "$mountp" = "$m" ]; then
310 # Resume the outer while loop
311 continue 2
312 fi
313 done
314 fi
315 if [ -n "$RFLAG" -a "$fstype" != "nfs" ]; then
316 continue
317 fi
318 if [ "$ZONENAME" != "global" ]; then
319 for option in `echo $mode | tr , '\012'`; do
320 #
321 # should not see any zone options
322 # but our own
323 #
324 if [ "$option" = "zone=$ZONENAME" ]; then
325 break
326 fi
327 done
328 if [ "$option" != "zone=$ZONENAME" ]; then
329 continue
330 fi
331 # we are called from the global zone
332 else
333 for option in `echo $mode | tr , '\012'`; do
334 case "$option" in
335 zone=*)
336 option="zone="
337 break
338 ;;
339 esac
340 done
341 # skip mounts from non-global zones if ZFLAG is not set
342 if [ "$option" = "zone=" -a -z "$ZFLAG" ]; then
343 continue
344 fi
345 # skip mounts from the global zone if ZFLAG is set
346 if [ "$option" != "zone=" -a -n "$ZFLAG" ]; then
347 continue
348 fi
349 fi
350 if [ -n "${KFLAG}" ]; then
351 fuser -c -k $mountp 1>&2
352 sleep 2
353 fi
354 if [ -n "$SFLAG" ]; then
355 umount ${UMOUNTFLAG} ${mountp} 1>&2
356 trc=$?
357 if [ $trc -ne 0 ]; then
358 rc=$trc
359 fi
360 else
361 # We want to umount in parallel
362 fslist="$fslist $mountp"
363 fi
364 esac
365 done
366
367 if [ -n "$fslist" ]; then
368 umount -a ${UMOUNTFLAG} $fslist 1>&2
369 trc=$?
370 if [ $trc -ne 0 ]; then
371 rc=$trc
372 fi
373 fi
374
375 echo $rc
376 )
377 }
378
379 #
380 # /etc/mnttab has the most recent mounts last. Reverse it so that we
381 # may umount in opposite order to the original mounts.
382 #
383
384 if [ ! -x /usr/bin/tail ]; then
385 exec < $MNTTAB
386 REVERSED=
387 while read line; do
388 if [ -n "$REVERSED" ]; then
389 REVERSED="$line\n$REVERSED"
390 else
391 REVERSED="$line"
392 fi
393 done
394
395 error=`echo $REVERSED | doumounts`
396 else
397 error=`tail -r $MNTTAB | doumounts`
398 fi
399
400 exit $error