qemu-iotests: Test concurrent cluster allocations

This adds some first tests for qcow2's dependency handling when two
parallel write requests access the same cluster.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 215 insertions, 0 deletions

diff --git a/tests/qemu-iotests/046 b/tests/qemu-iotests/046
new file mode 100755
index 0000000000..e0176f42df
--- /dev/null
+++ b/tests/qemu-iotests/046
@@ -0,0 +1,215 @@
+#!/bin/bash
+#
+# Test concurrent cluster allocations
+#
+# 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
+_supported_proto generic
+_supported_os Linux
+
+CLUSTER_SIZE=64k
+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 16 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()
+{
+# Allocate middle of cluster 1, then write to somewhere before and after it
+cat  <<EOF
+break write_aio A
+aio_write -P 10 0x18000 0x2000
+wait_break A
+
+aio_write -P 11 0x12000 0x2000
+aio_write -P 12 0x1c000 0x2000
+
+resume A
+aio_flush
+EOF
+
+# Sequential write case: Alloc middle of cluster 2, then write overlapping
+# to next cluster
+cat  <<EOF
+break write_aio A
+aio_write -P 20 0x28000 0x2000
+wait_break A
+aio_write -P 21 0x2a000 0x10000
+resume A
+aio_flush
+EOF
+
+# The same with a gap between both requests
+cat  <<EOF
+break write_aio A
+aio_write -P 40 0x48000 0x2000
+wait_break A
+aio_write -P 41 0x4c000 0x10000
+resume A
+aio_flush
+EOF
+
+# Sequential write, but the next cluster is already allocated
+cat  <<EOF
+write -P 70 0x76000 0x8000
+aio_flush
+break write_aio A
+aio_write -P 60 0x66000 0x2000
+wait_break A
+aio_write -P 61 0x6a000 0xe000
+resume A
+aio_flush
+EOF
+
+# Sequential write, but the next cluster is already allocated
+# and phyiscally in the right position
+cat  <<EOF
+write -P 89 0x80000 0x1000
+write -P 90 0x96000 0x8000
+aio_flush
+discard 0x80000 0x10000
+aio_flush
+break write_aio A
+aio_write -P 80 0x86000 0x2000
+wait_break A
+aio_write -P 81 0x8a000 0xe000
+resume A
+aio_flush
+EOF
+
+# Sequential write, and the next cluster is compressed
+cat  <<EOF
+write    -P 109 0xa0000 0x1000
+write -c -P 110 0xb0000 0x10000
+aio_flush
+discard 0xa0000 0x10000
+aio_flush
+break write_aio A
+aio_write -P 100 0xa6000 0x2000
+wait_break A
+aio_write -P 101 0xaa000 0xe000
+resume A
+aio_flush
+EOF
+}
+
+overlay_io | $QEMU_IO blkdebug::$TEST_IMG | _filter_qemu_io |\
+	sed -e 's/bytes at offset [0-9]*/bytes at offset XXX/g'
+
+echo
+echo "== Verify image content =="
+
+function verify_io()
+{
+    echo read -P 0 0 0x10000
+
+    echo read -P 1  0x10000 0x2000
+    echo read -P 11 0x12000 0x2000
+    echo read -P 1  0x14000 0x4000
+    echo read -P 10 0x18000 0x2000
+    echo read -P 1  0x1a000 0x2000
+    echo read -P 12 0x1c000 0x2000
+    echo read -P 1  0x1e000 0x2000
+
+    echo read -P 2  0x20000 0x8000
+    echo read -P 20 0x28000 0x2000
+    echo read -P 21 0x2a000 0x10000
+    echo read -P 3  0x3a000 0x6000
+
+    echo read -P 4  0x40000 0x8000
+    echo read -P 40 0x48000 0x2000
+    echo read -P 4  0x4a000 0x2000
+    echo read -P 41 0x4c000 0x10000
+    echo read -P 5  0x5c000 0x4000
+
+    echo read -P 6  0x60000 0x6000
+    echo read -P 60 0x66000 0x2000
+    echo read -P 6  0x68000 0x2000
+    echo read -P 61 0x6a000 0xe000
+    echo read -P 70 0x78000 0x6000
+    echo read -P 7  0x7e000 0x2000
+
+    echo read -P 8  0x80000 0x6000
+    echo read -P 80 0x86000 0x2000
+    echo read -P 8  0x88000 0x2000
+    echo read -P 81 0x8a000 0xe000
+    echo read -P 90 0x98000 0x6000
+    echo read -P 9  0x9e000 0x2000
+
+    echo read -P 10  0xa0000 0x6000
+    echo read -P 100 0xa6000 0x2000
+    echo read -P 10  0xa8000 0x2000
+    echo read -P 101 0xaa000 0xe000
+    echo read -P 110 0xb8000 0x8000
+}
+
+verify_io | $QEMU_IO $TEST_IMG | _filter_qemu_io
+
+_check_test_img
+
+# success, all done
+echo "*** done"
+rm -f $seq.full
+status=0