dm-thinp demo test

Fairly trivial test to use the dm-thin infrastructure.

Right now it exhausts space in queue-on-error mode,
adds more space, does a bit more IO, then unmounts &
checks the fs.

Not sure if that's valid to test, but it works here and
demonstrates the common/dmthin helpers.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>

tests/generic/347

@@ -0,0 +1,83 @@
+#! /bin/bash
+# FS QA Test No. generic/347
+#
+# Test very basic thin device usage, exhaustion, and growth
+#
+# Copyright (c) 2015 Red Hat, Inc.  All Rights Reserved.
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms 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.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write the Free Software Foundation,
+# Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+
+seq=`basename $0`
+seqres=$RESULT_DIR/$seq
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+
+status=1	# failure is the default!
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+BACKING_SIZE=$((500 * 1024 * 1024 / 512))	# 500M
+VIRTUAL_SIZE=$((10 * $BACKING_SIZE))		# 5000M
+GROW_SIZE=$((100 * 1024 * 1024 / 512))		# 100M
+
+_cleanup()
+{
+	_dmthin_cleanup
+	rm -f $tmp.*
+}
+
+_setup_thin()
+{
+	_dmthin_init $BACKING_SIZE $VIRTUAL_SIZE
+	_dmthin_set_queue
+	_mkfs_dev $DMTHIN_VOL_DEV
+	_dmthin_mount
+}
+
+_workout()
+{
+	# Overfill it by a bit
+	for I in `seq 1 500`; do
+		$XFS_IO_PROG -f -c "pwrite -W 0 1M" $SCRATCH_MNT/file$I &>/dev/null
+	done
+
+	sync
+
+	_dmthin_grow  $GROW_SIZE
+
+	# Write a little more, but don't fill
+	for I in `seq 501 510`; do
+		$XFS_IO_PROG -f -c "pwrite 0 1M" $SCRATCH_MNT/file$I &>/dev/null
+	done
+}
+
+# get standard environment, filters and checks
+. ./common/rc
+. ./common/dmthin
+
+_supported_fs generic
+_supported_os Linux
+_require_dm_target thin-pool
+
+_setup_thin
+_workout
+_dmthin_check_fs
+_dmthin_cleanup
+
+echo "=== completed"
+
+status=0
+exit

tests/generic/347.out

@@ -0,0 +1,2 @@
+QA output created by 347
+=== completed

tests/generic/group

@@ -349,6 +349,7 @@
 344 auto
 345 auto
 346 auto
+347 auto quick rw thin
 705 blockdev quick rw
 706 blockdev quick rw
 707 blockdev quick rw