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A LVM snapshot regression test by Greg Freemyer.

#! /bin/sh
# XFS QA Test No. 068
# $Id: 068,v 1.1 2002/09/02 06:04:01 nathans Exp $
#
# Test Linux LVM snapshot creation
#
# The timing and placement of kills and waits is particularily sensitive.
# Don't change them unless you want to spend some time getting it right again.
#
#-----------------------------------------------------------------------
# Copyright (c) 2000, 2002 Silicon Graphics, Inc.  All Rights Reserved.
# 
# This program is free software; you can redistribute it and/or modify it
# under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
# 
# This program is distributed in the hope that it would be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
# 
# Further, this software is distributed without any warranty that it is
# free of the rightful claim of any third person regarding infringement
# or the like.  Any license provided herein, whether implied or
# otherwise, applies only to this software file.  Patent licenses, if
# any, provided herein do not apply to combinations of this program with
# other software, or any other product whatsoever.
# 
# You should have received a copy of the GNU General Public License along
# with this program; if not, write the Free Software Foundation, Inc., 59
# Temple Place - Suite 330, Boston MA 02111-1307, USA.
# 
# Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
# Mountain View, CA  94043, or:
# 
# http://www.sgi.com 
# 
# For further information regarding this notice, see: 
# 
# http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
#-----------------------------------------------------------------------
#
# creator
owner=freemyer@NorcrossGroup.com

seq=`basename $0`
echo "QA output created by $seq"

here=`pwd`
tmp=`mktemp -d /tmp/xfstest.XXXXXX` || exit 1
status=1	# failure is the default!

# Either "dd" or "fsstress" can be used to generate io load.
# Setting both to "FALSE" tests with no io load.
GENERATE_IO_LOAD_VIA_DD=TRUE
GENERATE_IO_LOAD_VIA_FSSTRESS=TRUE
DELAY_BETWEEN_ITERATIONS=10
#ITERATIONS=10000
ITERATIONS=2

VG=/dev/VGscratch
SCRATCH_SNAP_MNT="$tmp/scratch_snap"

# Only needed if running by hand,  ie.  check sets these
#SCRATCH_LVM_DEV=/dev/xxxx
#SCRATCH_MNT=/scratch

_cleanup()
{
	echo Cleanup beginning

	rm "$tmp/running" > /dev/null 2>&1
	xfs_freeze -u "$SCRATCH_MNT"

	sleep 10      # Give the dd loop time to finish

	# Comment out unless needed.
	# If needed, wrap with logic to ensure the FS is mounted.
	# Kill off any other possible stray stragglers that may be out there.
	# There should not be any.
	#fuser -k -m "$SCRATCH_SNAP_MNT/dummy"     >/dev/null 2>&1
	#fuser -k -m "$SCRATCH_MNT/dummy"	  >/dev/null 2>&1

	wait

	umount "$SCRATCH_SNAP_MNT" > /dev/null 2>&1
	rmdir "$SCRATCH_SNAP_MNT" > /dev/null 2>&1
	umount "$SCRATCH_MNT" > /dev/null 2>&1

	lvremove -f "$VG/scratch_snap" > /dev/null 2>&1
	lvremove -f "$VG/scratch" > /dev/null 2>&1

#TODO   vgremove "$VG"

	rm -rf "$tmp"	# if we ever use tmp files
	trap 0 1 2 3 15
	exit $status
}

trap "_cleanup" 0 1 2 3 15


# get standard environment, filters and checks
. ./common.rc
. ./common.filter

[ -e "$SCRATCH_SNAP_MNT" ] && rm -rf "$SCRATCH_SNAP_MNT"
mkdir "$SCRATCH_SNAP_MNT"

#Verify we have the lvm user tools
[ -x /sbin/lvcreate ] || _notrun "lvcreate utility is not installed in /sbin"
[ -x /sbin/lvremove ] || _notrun "lvremove utility is not installed in /sbin"

# If the above fails for LVM 2, the below may be useful notes
#    try "lvm vgdisplay --version" and look for a > 1.9x version number, eg,
# 
#     LVM version:     1.95.10-cvs (2002-05-31)
#     Library version: 0.96.03-ioctl-cvs (2002-06-27)
#     Driver version:  1.0.3


LVM=false

# Check if LVM 1 is in the kernel
if grep lvm /proc/devices > /dev/null 2>&1; then LVM=true; fi

# Check if LVM 2 is in the kernel
if grep device-mapper /proc/devices > /dev/null 2>&1; then LVM=true; fi

# Check if EVMS is in the kernel
#TODO   # I don't know how to do this one.

[ "$LVM" = false ] && _notrun "LVM is not present in the running kernel."


# real QA test starts here

# Create a PV set from the scratch partition
#TODO # (I don't know if this is needed.and it is dangerous because it intentionally deletes the partition table!!! 
#TODO # dd if=/dev/zero of="$SCRATCH_LVM_DEV" bs=512 count=1
#TODO # pvcreate "$SCRATCH_LVM_DEV"

# Create a VG from the PV
#TODO # vgcreate "$VG" "$SCRATCH_LVM_DEV"

# Create a LV in the VG to snapshot
#TODO # lvcreate -L 2G -n scratch "$VG"

# Mount the LV
mkdir "$SCRATCH_MNT" > /dev/null 2&>1

mount "$VG/scratch" "$SCRATCH_MNT"

touch "$tmp/running"

if [ "$GENERATE_IO_LOAD_VIA_DD" != FALSE ];
then
	# Create a large 64 Meg zero filled file on the LV
	dd if=/dev/zero of=$SCRATCH_MNT/dummy bs=64k count=1000 >/dev/null 2>&1

	# Setup infinite loop copying the large file, thus generating heavy I/O
	touch "$tmp/running"
	while [ -f "$tmp/running" ]
	do
		dd if="$SCRATCH_MNT/dummy" of="$SCRATCH_MNT/junk" bs=64k \
			> /dev/null 2>&1
		# This forces metadata updates the next time around
		rm "$SCRATCH_MNT/junk"
		sync
	done 
fi &

if [ "$GENERATE_IO_LOAD_VIA_FSSTRESS" != FALSE ];
then
	STRESS_DIR="$SCRATCH_MNT/fsstress_test_dir"
	mkdir "$STRESS_DIR"

	while [ -f "$tmp/running" ]
	do
		# -n 10 makes this take about 10 seconds,
		# This allows the loop to end shortly after $tmp/running
		# is deleted
		$here/src/fsstress -d "$STRESS_DIR" -n 10  > /dev/null 2>&1
		sync
	done

	rm -rf "$STRESS_DIR"
fi &

ii=1

while [ $ii -le "$ITERATIONS" ]
do

	# Useful if running interactively, but not from the xfs test scripts
	#echo $ii

	# If the VFS lock patch is present, the calls to xfs_freeze
	# are redundant, but should cause no problems
	#       OPTIONAL
	xfs_freeze -f "$SCRATCH_MNT"
	if [ $? != 0 ] ; then
		echo xfs_freeze -f "$SCRATCH_MNT" failed
	fi
	(
		lvcreate --snapshot --size 1G --name scratch_snap "$VG/scratch"\
			> /dev/null 2>&1
		ret=$?
		[ $ret != 0 ] && \
			echo "Snapshot $SCRATCH_MNT create failed, status=$ret"
		fi
	) &
	SNAPSHOT_shell_pid=$!

	# If the Snapshot has not completed in ten minutes, kill it
	(
		# I have NOT figured out how to kill the sleep 600 before
		# it exits naturally.
		# This does not cause a problem, but it clutters the ps table.
		sleep 600

		# The kill $TIMEOUT_shell_pid keeps the below from occuring
		echo Snapshot Lockup Occured on loop $ii
		xfs_freeze -u "$SCRATCH_MNT"
		kill $$
	) &
	TIMEOUT_shell_pid=$!

	wait "$SNAPSHOT_shell_pid"

	exec 2> /dev/null		# Send the shells stderr to /dev/null
	kill "$TIMEOUT_shell_pid"	# Cancel the timeout
	wait "$TIMEOUT_shell_pid"	# This causes consistent shell
					# notification for some unknown reason
	exec 2>&1			# Put it back to the same as stdout

	# If the VFS lock patch is present, the calls to xfs_freeze
	# are redundant, but should cause no problems
	#       OPTIONAL
	xfs_freeze -u "$SCRATCH_MNT"
	if [ $? != 0 ] ; then
		echo xfs_freeze -u "$SCRATCH_MNT" failed
	fi
	#	  MANDANTORY   (end)

	mount -t xfs -o ro,nouuid "$VG/scratch_snap" "$SCRATCH_SNAP_MNT"
	if [ $? != 0 ] ; then
		echo mount for "$SCRATCH_SNAP_MNT" failed
	fi
	umount "$SCRATCH_SNAP_MNT"
	if [ $? != 0 ] ; then
		echo umount for "$SCRATCH_SNAP_MNT" failed
	fi
	lvremove -f "$VG/scratch_snap" > /dev/null 2>&1
	if [ $? != 0 ] ; then
	       echo lvremove for "$VG/scratch_snap" failed
	fi

	ii=`expr $ii + 1`

	sleep "$DELAY_BETWEEN_ITERATIONS"      
	# The VG seems to need time to stabalize between snapshots
	# With LVM 1.0.3 and XFS 1.1, I have tried this at 3600 seconds
	# and still had failures

done

# success, all done
echo SUCCESS, COMPLETED ALL ITERATIONS WITH NO TIME OUTS!!!!!!!!!!!!
status=0
_cleanup
exit 1   # _cleanup should exit, so we should never get here.