From 31ab00f3747c00fdbb9027cea644b40dd1405480 Mon Sep 17 00:00:00 2001
From: Max Reitz
Date: Tue, 25 Feb 2020 15:31:29 +0100
Subject: iotests/026: Test EIO on preallocated zero cluster

Test what happens when writing data to a preallocated zero cluster, but
the data write fails.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20200225143130.111267-3-mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
 tests/qemu-iotests/026 | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

(limited to 'tests/qemu-iotests/026')

diff --git a/tests/qemu-iotests/026 b/tests/qemu-iotests/026
index a4aa74764f..0c1273c339 100755
--- a/tests/qemu-iotests/026
+++ b/tests/qemu-iotests/026
@@ -218,6 +218,27 @@ _make_test_img 64M
 $QEMU_IO -c "write 0 1M" -c "write 0 1M" "$BLKDBG_TEST_IMG" | _filter_qemu_io
 _check_test_img
 
+echo
+echo === Avoid freeing preallocated zero clusters on failure ===
+echo
+
+cat > "$TEST_DIR/blkdebug.conf" <<EOF
+[inject-error]
+event = "write_aio"
+errno = "5"
+once = "on"
+EOF
+
+_make_test_img $CLUSTER_SIZE
+# Create a preallocated zero cluster
+$QEMU_IO -c "write 0 $CLUSTER_SIZE" -c "write -z 0 $CLUSTER_SIZE" "$TEST_IMG" \
+    | _filter_qemu_io
+# Try to overwrite it (prompting an I/O error from blkdebug), thus
+# triggering the alloc abort code
+$QEMU_IO -c "write 0 $CLUSTER_SIZE" "$BLKDBG_TEST_IMG" | _filter_qemu_io
+
+_check_test_img
+
 # success, all done
 echo "*** done"
 rm -f $seq.full
-- 
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