harness: Add fallback code for filesystems not supporting O_DIRECT

When running the harness on a filesystem such as a tmpfs, which do not
support O_DIRECT, fallback to calls without the flag.

Signed-off-by: Guillem Jover <guillem@hadrons.org>
[JEM: change from duplicating the open call to using F_SETFL]
[JEM: 18 and 21 require O_DIRECT-skip if not present]
Signed-off-by: Jeff Moyer <jmoyer@redhat.com>

4 files changed, 23 insertions, 5 deletions

diff --git a/harness/cases/17.t b/harness/cases/17.t
index 38ada4d..b4b6660 100644
--- a/harness/cases/17.t
+++ b/harness/cases/17.t
@@ -119,7 +119,7 @@ void prune(io_context_t io_ctx, int max_ios, int getevents_type)
 
 void run_test(int max_ios, int getevents_type)
 {
-	int fd, ret;
+	int fd, ret, flags;
 	long i, to_submit;
 	struct iocb **iocb_sub;
 	io_context_t io_ctx;
@@ -137,9 +137,16 @@ void run_test(int max_ios, int getevents_type)
 	events = calloc(max_ios, sizeof(*events));
 
 	unlink(filename);
-	fd = open(filename, O_CREAT | O_RDWR | O_DIRECT, 0644);
+	fd = open(filename, O_CREAT | O_RDWR, 0644);
 	assert(fd >= 0);
 
+	/*
+	 * Use O_DIRECT if it's available.  If it's not, the test code
+	 * will still operate correctly, just potentially slower.
+	 */
+	flags = fcntl(fd, F_GETFL, 0);
+	fcntl(fd, F_SETFL, flags | O_DIRECT);
+
 	ret = ftruncate(fd, max_ios * io_size);
 	assert(!ret);
 
diff --git a/harness/cases/18.t b/harness/cases/18.t
index daa1d26..e8dbcd1 100644
--- a/harness/cases/18.t
+++ b/harness/cases/18.t
@@ -53,6 +53,8 @@ aio_worker(void *ptr)
 	assert(buffer != NULL);
 
 	fd = open(FILENAME, O_DIRECT|O_RDONLY);
+	if (fd < 0 && errno == EINVAL)
+		exit(3); /* skip this test, O_DIRECT is unavailable */
 	assert(fd >= 0);
 
 	for (i = 0; i < 1000; i++) {
diff --git a/harness/cases/19.t b/harness/cases/19.t
index 5c3e0d6..ba1c620 100644
--- a/harness/cases/19.t
+++ b/harness/cases/19.t
@@ -38,15 +38,21 @@ struct aio_ring {
 int
 open_temp_file(void)
 {
-	int fd;
+	int fd, flags;
 	char template[sizeof(TEMPLATE)];
 
 	strncpy(template, TEMPLATE, sizeof(template));
-	fd = mkostemp(template, O_DIRECT);
+	fd = mkstemp(template);
 	if (fd < 0) {
 		perror("mkstemp");
 		exit(1);
 	}
+	/*
+	 * O_DIRECT is desirable, but not required for this test.
+	 */
+	flags = fcntl(F_GETFL, 0);
+	fcntl(F_SETFL, flags | O_DIRECT);
+
 	unlink(template);
 	return fd;
 }
diff --git a/harness/cases/21.t b/harness/cases/21.t
index fe33a9d..ba988ed 100644
--- a/harness/cases/21.t
+++ b/harness/cases/21.t
@@ -92,7 +92,10 @@ test_main()
 	 */
 	flags = fcntl(fd, F_GETFL);
 	ret = fcntl(fd, F_SETFL, flags | O_DIRECT);
-	if (ret != 0) {
+	if (ret < 0) {
+		/* SKIP this test if O_DIRECT is not available on this fs */
+		if (errno == EINVAL)
+			return 3;
 		perror("fcntl");
 		return 1;
 	}