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-rw-r--r--test/lib/aux.sh1
1 files changed, 1 insertions, 0 deletions
diff --git a/test/lib/aux.sh b/test/lib/aux.sh
index d6689e3b8..a385df76b 100644
--- a/test/lib/aux.sh
+++ b/test/lib/aux.sh
@@ -669,6 +669,7 @@ prepare_loop() {
done
fi
test -n "$LOOP" # confirm or fail
+ touch NO_BLKDISCARD_Z # loop devices do not support WRITE_ZEROS
BACKING_DEV=$LOOP
echo "$LOOP" > LOOP
echo "$LOOP" > BACKING_DEV