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-rwxr-xr-xqemu/tests/qemu-iotests/038134
1 files changed, 134 insertions, 0 deletions
diff --git a/qemu/tests/qemu-iotests/038 b/qemu/tests/qemu-iotests/038
new file mode 100755
index 000000000..cfaf00a78
--- /dev/null
+++ b/qemu/tests/qemu-iotests/038
@@ -0,0 +1,134 @@
+#!/bin/bash
+#
+# Test COW from backing files with AIO
+#
+# Copyright (C) 2012 Red Hat, Inc.
+#
+# 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; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will 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, see <http://www.gnu.org/licenses/>.
+#
+
+# creator
+owner=kwolf@redhat.com
+
+seq=`basename $0`
+echo "QA output created by $seq"
+
+here=`pwd`
+tmp=/tmp/$$
+status=1 # failure is the default!
+
+_cleanup()
+{
+ _cleanup_test_img
+}
+trap "_cleanup; exit \$status" 0 1 2 3 15
+
+# get standard environment, filters and checks
+. ./common.rc
+. ./common.filter
+
+_supported_fmt qcow2 qed
+_supported_proto file
+_supported_os Linux
+
+CLUSTER_SIZE=2M
+size=128M
+
+echo
+echo "== creating backing file for COW tests =="
+
+_make_test_img $size
+
+function backing_io()
+{
+ local offset=$1
+ local sectors=$2
+ local op=$3
+ local pattern=0
+ local cur_sec=0
+
+ for i in $(seq 0 $((sectors - 1))); do
+ cur_sec=$((offset / 65536 + i))
+ pattern=$(( ( (cur_sec % 128) + (cur_sec / 128)) % 128 ))
+
+ echo "$op -P $pattern $((cur_sec * 64))k 64k"
+ done
+}
+
+backing_io 0 256 write | $QEMU_IO "$TEST_IMG" | _filter_qemu_io
+
+mv "$TEST_IMG" "$TEST_IMG.base"
+
+_make_test_img -b "$TEST_IMG.base" 6G
+
+echo
+echo "== Some concurrent requests touching the same cluster =="
+
+function overlay_io()
+{
+ # Start with a request touching two clusters
+ echo aio_write -P 0x80 2020k 80k
+
+ # Then add some requests all over the place
+ for i in $(seq 0 15; seq 17 31; seq 33 47); do
+ echo aio_write -P $((0x81 + i)) $((i * 128))k 64k
+ done
+
+ # Then backwards overwriting part of them
+ for i in $( (seq 0 15; seq 17 31; seq 33 47) | tac); do
+ echo aio_write -P $((0x81 + i)) $((i * 128 + 32))k 64k
+ done
+
+ # And finally crossing the next cluster boundary
+ echo aio_write -P 0x90 4080k 80k
+}
+
+overlay_io | $QEMU_IO "$TEST_IMG" | _filter_qemu_io |\
+ sed -e 's/bytes at offset [0-9]*/bytes at offset XXX/g' \
+ -e 's/qemu-io> //g' | paste - - | sort | tr '\t' '\n'
+
+echo
+echo "== Verify image content =="
+
+function verify_io()
+{
+ echo read -P 31 2016k 4k
+ echo read -P 0x80 2020k 80k
+ echo read -P 32 2100k 12k
+ echo read -P 33 2112k 64k
+
+ echo read -P 63 4064k 16k
+ echo read -P 0x90 4080k 80k
+ echo read -P 65 4160k 64k
+
+ for i in $(seq 0 15; seq 17 31; seq 33 47); do
+ echo read -P $((0x81 + i)) $((i * 128))k 96k
+ done
+
+ for i in $(seq 0 14; seq 16 30; seq 32 47); do
+ local cur_sec=$(( i * 2 + 1 ))
+ local pattern=$(( ( (cur_sec % 128) + (cur_sec / 128)) % 128 ))
+
+ echo read -P $pattern $((i * 128 + 96))k 32k
+ done
+}
+
+verify_io | $QEMU_IO "$TEST_IMG" | _filter_qemu_io
+
+_check_test_img
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0