stop.sh: unmap rbd images when stopping the whole cluster

Unmap rbd images when stopping the whole cluster.  Not doing so results
in images that cannot be unmapped until the same cluster is brought
back up.  Issue a warning if we failed to unmap all images.

Signed-off-by: Ilya Dryomov <[email protected]>

src/stop.sh

@@ -18,6 +18,8 @@
 
 test -d dev/osd0/. && test -e dev/sudo && SUDO="sudo"
 
+[ -z "$CEPH_BIN" ] && CEPH_BIN=.
+
 do_killall() {
     pg=`pgrep -f ceph-run.*$1`
     [ -n "$pg" ] && kill $pg
@@ -57,6 +59,20 @@ while [ $# -ge 1 ]; do
 done
 
 if [ $stop_all -eq 1 ]; then
+    while read DEV; do
+        # While it is currently possible to create an rbd image with
+        # whitespace chars in its name, krbd will refuse mapping such
+        # an image, so we can safely split on whitespace here.  (The
+        # same goes for whitespace chars in names of the pools that
+        # contain rbd images).
+        DEV="$(echo "${DEV}" | tr -s '[:space:]' | awk '{ print $5 }')"
+        sudo "${CEPH_BIN}"/rbd unmap "${DEV}"
+    done < <("${CEPH_BIN}"/rbd showmapped | tail -n +2)
+
+    if [ -n "$("${CEPH_BIN}"/rbd showmapped)" ]; then
+        echo "WARNING: Some rbd images are still mapped!" >&2
+    fi
+
     for p in ceph-mon ceph-mds ceph-osd radosgw lt-radosgw apache2 ; do
         for try in 0 1 1 1 1 ; do
             if ! pkill $p ; then
@@ -65,6 +81,7 @@ if [ $stop_all -eq 1 ]; then
             sleep $try
         done
     done
+
     pkill -f valgrind.bin.\*ceph-mon
     $SUDO pkill -f valgrind.bin.\*ceph-osd
     pkill -f valgrind.bin.\*ceph-mds