[PATCH 1/2] dio-writeback-race: fix missing mode in O_CREAT

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Fix this build error:

In file included from /usr/include/fcntl.h:314,
                 from dio-writeback-race.c:40:
In function 'open',
    inlined from 'main' at dio-writeback-race.c:110:7:
/usr/include/x86_64-linux-gnu/bits/fcntl2.h:50:11: error: call to '__open_missing_mode' declared with attribute error: open with O_CREAT or O_TMPFILE in second argument needs 3 arguments
   50 |           __open_missing_mode ();
      |           ^~~~~~~~~~~~~~~~~~~~~~

Cc: <fstests@xxxxxxxxxxxxxxx> # v2025.02.16
Fixes: 17fb49493426ad ("fstests: add a generic test to verify direct IO writes with buffer contents change")
Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
---
 src/dio-writeback-race.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


diff --git a/src/dio-writeback-race.c b/src/dio-writeback-race.c
index 963ed207fc1b6b..2d3156e5b0974a 100644
--- a/src/dio-writeback-race.c
+++ b/src/dio-writeback-race.c
@@ -107,7 +107,7 @@ int main (int argc, char *argv[])
 		fprintf(stderr, "failed to allocate aligned memory\n");
 		exit(EXIT_FAILURE);
 	}
-	fd = open(argv[optind], O_DIRECT | O_WRONLY | O_CREAT);
+	fd = open(argv[optind], O_DIRECT | O_WRONLY | O_CREAT, 0600);
 	if (fd < 0) {
 		fprintf(stderr, "failed to open file '%s': %m\n", argv[optind]);
 		goto error;