Add rc script for rbd map/unmap

Init script for mapping/unmapping rbd device on startup and shutdown.
On start, map rbd dev according to /etc/rbdmap, and force mount -a
On stop, umount file system depending on rbd and unmap all rbd
Since some distribution use symlink for /etc/mtab, the user-space attribute _netdev is not enough to umount file system before rbd dev.
(also concern: #1790)

Signed-off-by: Laurent Barbe <laurent@ksperis.com>

diff --git a/src/init-rbdmap b/src/init-rbdmap
new file mode 100755 (executable)
index 0000000..31c90da
--- /dev/null
+++ b/src/init-rbdmap
@@ -0,0 +1,103 @@
+#!/bin/bash
+
+### BEGIN INIT INFO
+# Provides:          rbdmap
+# Required-Start:    $network
+# Required-Stop:     $network
+# Default-Start:     2 3 4 5
+# Default-Stop:      0 1 6
+# Short-Description: Ceph RBD Mapping
+# Description:       Ceph RBD Mapping
+### END INIT INFO
+
+DESC="RBD Mapping"
+RBDMAPFILE="/etc/rbdmap"
+
+. /lib/lsb/init-functions
+
+do_map() {
+       if [ ! -f "$RBDMAPFILE" ]; then
+               log_warning_msg "$DESC : No $RBDMAPFILE found."
+               exit 0
+       fi
+
+       log_daemon_msg "Starting $DESC"
+       # Read /etc/rbdtab to create non-existant mapping
+       newrbd=
+       RET=0
+       while read DEV PARAMS; do
+               case "$DEV" in
+                 ""|\#*)
+                       continue
+                       ;;
+                 */*)
+                       ;;
+                 *)
+                       DEV=rbd/$DEV
+                       ;;
+               esac
+               OIFS=$IFS
+               IFS=','
+               for PARAM in ${PARAMS[@]}; do
+                       CMDPARAMS="$CMDPARAMS --$(echo $PARAM | tr '=' ' ')"
+               done
+               IFS=$OIFS
+               if [ ! -b /dev/rbd/$DEV ]; then
+                       log_progress_msg $DEV
+                       rbd map $DEV $CMDPARAMS
+                       [ $? -ne "0" ] && RET=1
+                       newrbd="yes"
+               fi
+       done < $RBDMAPFILE
+       log_end_msg $RET
+
+       # Mount new rbd
+       if [ "$newrbd" ]; then
+                log_action_begin_msg "Mounting all filesystems"
+               mount -a
+               log_action_end_msg $?
+       fi
+}
+
+do_unmap() {
+       log_daemon_msg "Stopping $DESC"
+       RET=0
+       # Unmap all rbd device
+       for DEV in /dev/rbd[0-9]*; do
+               log_progress_msg $DEV
+               # Umount before unmap
+               MNTDEP=$(findmnt --mtab --source $DEV --output TARGET | sed 1,1d | sort -r)
+               for MNT in $MNTDEP; do
+                       umount $MNT || sleep 1 && umount -l $DEV
+               done
+               rbd unmap $DEV
+               [ $? -ne "0" ] && RET=1
+       done
+       log_end_msg $RET
+}
+
+
+case "$1" in
+  start)
+       do_map
+       ;;
+
+  stop)
+       do_unmap
+       ;;
+
+  reload)
+       do_map
+       ;;
+
+  status)
+       rbd showmapped
+       ;;
+
+  *)
+       log_success_msg "Usage: rbdmap {start|stop|reload|status}"
+       exit 1
+       ;;
+esac
+
+exit 0

diff --git a/src/rbdmap b/src/rbdmap
new file mode 100644 (file)
index 0000000..b0784cf
--- /dev/null
+++ b/src/rbdmap
@@ -0,0 +1,2 @@
+# RbdDevice            Parameters
+#poolname/imagename    id=client,keyring=/etc/ceph/ceph.client.keyring