qemu-iotests: Test qcow2 preallocation modes

[mirror_qemu.git] / tests / qemu-iotests / 033

diff --git a/tests/qemu-iotests/033 b/tests/qemu-iotests/033
index 2cdfd1397aff485ad4463aa3469da4b02cbb7393..cfdf1ec2bab74d6b7e0144582587393e65a0b2a3 100755 (executable)
--- a/tests/qemu-iotests/033
+++ b/tests/qemu-iotests/033
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 #
 # Test aligned and misaligned write zeroes operations.
 #
@@ -24,7 +24,6 @@ owner=pbonzini@redhat.com
 seq=`basename $0`
 echo "QA output created by $seq"
 
-here=`pwd`
 status=1       # failure is the default!
 
 _cleanup()
@@ -64,6 +63,9 @@ do_test()
        } | $QEMU_IO $IO_EXTRA_ARGS
 }
 
+echo
+echo "=== Test aligned and misaligned write zeroes operations ==="
+
 for write_zero_cmd in "write -z" "aio_write -z"; do
 for align in 512 4k; do
        echo
@@ -102,7 +104,34 @@ for align in 512 4k; do
 done
 done
 
+_cleanup_test_img
+
+# Trigger truncate that would shrink qcow2 L1 table, which is done by
+#   clearing one entry (8 bytes) with bdrv_co_pwrite_zeroes()
+
+echo
+echo "=== Test misaligned write zeroes via truncate ==="
+echo
+
+# any size will do, but the smaller the size the smaller the required image
+CLUSTER_SIZE=$((4 * 1024))
+L2_COVERAGE=$(($CLUSTER_SIZE * $CLUSTER_SIZE / 8))
+_make_test_img $(($L2_COVERAGE * 2))
+
+do_test 512 "write -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
+# next L2 table
+do_test 512 "write -P 1 $L2_COVERAGE 0x200" "$TEST_IMG" | _filter_qemu_io
+
+# only interested in qcow2 here; also other formats might respond with
+#  "not supported" error message
+if [ $IMGFMT = "qcow2" ]; then
+    do_test 512 "truncate $L2_COVERAGE" "$TEST_IMG" | _filter_qemu_io
+fi
+
+do_test 512 "read -P 1 0 0x200" "$TEST_IMG" | _filter_qemu_io
+
 # success, all done
+echo
 echo "*** done"
 rm -f $seq.full
 status=0