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Modified init script to handle other cache methods
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codyro authored and Mohan Srinivasan committed Nov 5, 2013
1 parent 09cd282 commit ceb3821
Showing 1 changed file with 67 additions and 33 deletions.
100 changes: 67 additions & 33 deletions utils/flashcache
Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
#!/bin/bash
#
# flashcache Init Script to manage cachedev loads
# flashcache Init Script to manage cachedev loads
#
# chkconfig: 345 9 98
# description: Flashcache Management
Expand All @@ -13,21 +13,24 @@ BACKEND_DISK=
CACHEDEV_NAME=
MOUNTPOINT=
FLASHCACHE_NAME=
CACHE_MODE= # back|around|thru

# Just a check, to validate the above params are set
[ -z "$SSD_DISK" ] && exit 10
[ -z "$BACKEND_DISK" ] && exit 11
[ -z "$CACHEDEV_NAME" ] && exit 12
[ -z "$MOUNTPOINT" ] && exit 13
[ -z "$FLASHCACHE_NAME" ] && exit 14
[ -z "$CACHE_MODE" ] && exit 15

# Source function library.
. /etc/rc.d/init.d/functions

#globals
DMSETUP=`/usr/bin/which dmsetup`
SERVICE=flashcache
FLASHCACHE_LOAD=/sbin/flashcache_load
FLASHCACHE_LOAD=`/usr/bin/which flashcache_load`
FLASHCACHE_CREATE=`/usr/bin/which flashcache_create`
SUBSYS_LOCK=/var/lock/subsys/$SERVICE

RETVAL=0
Expand All @@ -38,41 +41,72 @@ start() {
/sbin/modprobe flashcache
RETVAL=$?
if [ $RETVAL -ne 0 ]; then
echo "Module Load Error: flashcache. Exited with status - $RETVAL"
exit $RETVAL
echo "Module Load Error: flashcache. Exited with status - $RETVAL"
exit $RETVAL
fi
#flashcache_load the cachedev
$FLASHCACHE_LOAD $SSD_DISK $CACHEDEV_NAME
RETVAL=$?
if [ $RETVAL -ne 0 ]; then
echo "Failed: flashcache_load $SSD_DISK $CACHEDEV_NAME"
exit $RETVAL;
# Could clean this up with a case statement
if [[ $CACHE_MODE == "back" ]]; then
#flashcache_load the cachedev
$FLASHCACHE_LOAD $SSD_DISK $CACHEDEV_NAME
RETVAL=$?
if [ $RETVAL -ne 0 ]; then
echo "Failed: flashcache_load $SSD_DISK $CACHEDEV_NAME"
exit $RETVAL;
fi
elif [[ $CACHE_MODE == "thru" || $CACHE_MODE == "around" ]]; then
# use flashcache_create, no persistence on these modes
$FLASHCACHE_CREATE -p $CACHE_MODE $CACHEDEV_NAME $SSD_DISK $BACKEND_DISK
RETVAL=$?
if [ $RETVAL -ne 0 ]; then
echo "Failed: flashcache_create -p $CACHE_MODE $CACHEDEV_NAME $SSD_DISK $BACKEND_DISK"
exit $RETVAL;
fi
else
echo "Invalid cache mode: $CACHE_MODE."
exit 1
fi
#mount
if [ -L /dev/mapper/$CACHEDEV_NAME ]; then
/bin/mount /dev/mapper/$CACHEDEV_NAME $MOUNTPOINT
RETVAL=$?
if [ $RETVAL -ne 0 ]; then
echo "Mount Failed: /dev/mapper/$CACHEDEV_NAME to $MOUNTPOINT"
exit $RETVAL
fi
/bin/mount /dev/mapper/$CACHEDEV_NAME $MOUNTPOINT
RETVAL=$?
if [ $RETVAL -ne 0 ]; then
echo "Mount Failed: /dev/mapper/$CACHEDEV_NAME to $MOUNTPOINT"
exit $RETVAL
fi
else
echo "Not Found: /dev/mapper/$CACHEDEV_NAME"
exit 1
echo "Not Found: /dev/mapper/$CACHEDEV_NAME"
exit 1
fi
#lock subsys
touch $SUBSYS_LOCK
}

stop() {
echo "Stopping Flashcache..."
#unmount
/bin/umount $MOUNTPOINT
RETVAL=$?
if [ $RETVAL -ne 0 ]; then
echo "Failed to unmount $MOUNTPOINT"
exit 1
fi

#check for force flag
FLAG=0
[ "$1" == '--force' ] && FLAG=1
/sbin/sysctl -w dev.flashcache.$FLASHCACHE_NAME.fast_remove=$FLAG
echo "Flushing flashcache: Flushes to $BACKEND_DISK"
if [[ $CACHE_MODE == "back" ]]; then
# Only writeback has fast_remove / needs this
FLAG=0
[ "$1" == '--force' ] && FLAG=1
/sbin/sysctl -w dev.flashcache.$FLASHCACHE_NAME.fast_remove=$FLAG
echo "Flushing flashcache: Flushes to $BACKEND_DISK"
fi
$DMSETUP remove $CACHEDEV_NAME

RETVAL=$?
if [ $RETVAL -ne 0 ]; then
echo "Failed to remove device!"
exit 1
fi

#unlock subsys
rm -f $SUBSYS_LOCK
}
Expand All @@ -85,20 +119,20 @@ status() {

case $1 in
start)
start
;;
start
;;
stop)
stop
;;
stop
;;
status)
status
;;
status
;;
forcestop)
stop --force
;;
stop --force
;;
*)
echo "Usage: $0 {start|stop|status}"
exit 1
echo "Usage: $0 {start|stop|status}"
exit 1
esac

exit 0
exit 0

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