2 # Utility script to create an OBD snapshot. If an existing filesystem is
3 # not already mounted on /mnt/obd, we call the basic OBD setup script to
4 # create and mount a filesystem for us.
5 OBDDIR="`dirname $0`/.."
7 . $OBDDIR/demos/config.sh
10 # prepare the snapshot drive with a file to be COW'd
12 mount | grep $MNTOBD > /dev/null 2>&1
14 echo "Stuff still mounted on $MNTOBD; clean up first."
18 if [ ! -d /mnt/obd/lost+found ]; then
19 $OBDDIR/demos/obdfssetup.sh
20 if [ x$? != x0 ]; then
21 echo "Error in obdfssetup.sh"
26 if [ ! -f $MNTOBD/hello ]; then
27 $OBDDIR/demos/obdtest.sh
28 if [ x$? != x0 ]; then
29 echo "Error in obdfssetup.sh"
36 insmod $OBDDIR/snap/obdsnap.o
40 plog log "NEW SNAP SETUP"
41 # Create two snapshots using the OBD snapshot driver. One will be the
42 # "current" snapshot (in obd device 1), where changes will take place.
43 # The current snapshot is required in order to use the filesystem. The
44 # second will be a snapshot of the filesystem taken "now" (in obd device 2)
45 # that will remain static (historical read-only) filesystem as changes
46 # are made to the current snapshot.
47 $OBDDIR/class/obdcontrol -f << EOF
68 # Mount the two filesystems. The filesystem under $MNTOBD will be the
69 # one where changes are made, while $MNTSNAP will contain the original
70 # files at the point when the snapshot was taken.
72 plog mount -t obdfs -odevice=/dev/obd1 none $MNTOBD
73 plog mount -t obdfs -oro,device=/dev/obd2 none $MNTSNAP