rbdmap: per-device post-map/pre-unmap hooks

There are cases when automatic (un-)mounting of file system on RBD is not
enough. Some services may need to be started when RBD device becomes
available (mapped) as well as it may be desirable to stop services in order
to release file system before unmapping RBD device.

File system(s) on RBD is not the only use case scenario. RBD devices may be
used as block devices in which case `/etc/fstab` is not sufficient to
perform action upon mapping RBD device. A handler script (hook) can be
useful to properly release RBD device before unmapping, etc.

Pre-unmap hooks can be important for clean shut down and for re-exporting
RBD device(s) as (iSCSI,AoE,DRBD) etc.

This commit introduces support for per-device hooks to perform per-device
post-map/pre-unmap actions. If hook named like "poolname/imagename" (same
as in `/etc/ceph/rbdmap` file) is found in

    /etc/ceph/rbd.d/poolname/imagename

it is executed as

    /etc/ceph/rbd.d/poolname/imagename map poolname/imagename

following after attempt to mount file system (if relevant `fstab` entry
exist) following mapping of corresponding RBD device.

Before un-mounting file system and un-mapping RBD device hook is called as
follows:

    /etc/ceph/rbd.d/poolname/imagename unmap poolname/imagename

Second argument is intentional to allow multiple RBD devices to share the
same hook (symlinked under different names).

Sample hook to use RBD device as "mdadm" hot spare may look like this:

~~~~
DEV="$2"
case "$1" in
    "map")
        mdadm /dev/md2 --add --write-mostly "${DEV}"
    ;;
    "unmap")
        mdadm /dev/md2 --fail "${DEV}"
        sleep 2
        mdadm /dev/md2 --remove "${DEV}"
    ;;
esac
~~~~

Signed-off-by: Dmitry Smirnov <onlyjob@member.fsf.org>

diff --git a/src/init-rbdmap b/src/init-rbdmap
index a15d744c988baf3658a97cc2ae5f89c832075033..a4e986318efb0d7d61ccb607660a75d6c40fa7c4 100755 (executable)
--- a/src/init-rbdmap
+++ b/src/init-rbdmap
@@ -64,11 +64,17 @@ do_map() {
                log_action_end_msg ${RET_OP} "${MAP_RV}"
 
                if [ "$newrbd" ]; then
-                        ## Mount new rbd
+                       ## Mount new rbd
                        MNT_RV=""
                        mount --fake /dev/rbd/$DEV >>/dev/null 2>&1 \
                        && MNT_RV=$(mount -v /dev/rbd/$DEV 2>&1)
                        [ -n "${MNT_RV}" ] && log_action_msg "mount: ${MNT_RV}"
+
+                       ## post-mapping
+                       if [ -x "/etc/ceph/rbd.d/${DEV}" ]; then
+                           log_action_msg "RBD Running post-map hook '/etc/ceph/rbd.d/${DEV}'"
+                           /etc/ceph/rbd.d/${DEV} map "/dev/rbd/${DEV}"
+                       fi
                fi
        done < $RBDMAPFILE
        exit ${RET}
@@ -80,6 +86,17 @@ do_unmap() {
        ## Unmount and unmap all rbd devices
        if ls /dev/rbd[0-9]* >/dev/null 2>&1; then
                for DEV in /dev/rbd[0-9]*; do
+                       ## pre-unmapping
+                       for L in $(find /dev/rbd -type l); do
+                           LL="${L##/dev/rbd/}"
+                           if [ "$(readlink -f $L)" = "${DEV}" ] \
+                           && [ -x "/etc/ceph/rbd.d/${LL}" ]; then
+                               log_action_msg "RBD pre-unmap:  '${DEV}' hook '/etc/ceph/rbd.d/${LL}'"
+                               /etc/ceph/rbd.d/${LL} unmap "$L"
+                               break
+                           fi
+                       done
+
                        log_action_begin_msg "RBD un-mapping: '${DEV}'"
                        UMNT_RV=""
                        UMAP_RV=""