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diff --git a/src/ceph/qa/workunits/fs/test_o_trunc.c b/src/ceph/qa/workunits/fs/test_o_trunc.c
new file mode 100644
index 0000000..1ce19e4
--- /dev/null
+++ b/src/ceph/qa/workunits/fs/test_o_trunc.c
@@ -0,0 +1,45 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[])
+{
+	char obuf[32], ibuf[1024];
+	int n, max = 0;
+	
+	if (argc > 2)
+		max = atoi(argv[2]);
+	if (!max)
+		max = 600;
+	
+	memset(obuf, 0xff, sizeof(obuf));
+	
+	for (n = 1; n <= max; ++n) {
+		int fd, ret;
+		fd = open(argv[1], O_RDWR | O_CREAT | O_TRUNC, 0644);
+		printf("%d/%d: open fd = %d\n", n, max, fd);
+		
+		ret = write(fd, obuf, sizeof(obuf));
+		printf("write ret = %d\n", ret);
+		
+		sleep(1);
+		
+		ret = write(fd, obuf, sizeof(obuf));
+		printf("write ret = %d\n", ret);
+		
+		ret = pread(fd, ibuf, sizeof(ibuf), 0);
+		printf("pread ret = %d\n", ret);
+		
+		if (memcmp(obuf, ibuf, sizeof(obuf))) {
+			printf("mismatch\n");
+			close(fd);
+			break;
+		}
+		close(fd);
+	}
+	return 0;
+}