test/fsync: add simple fsync tester

Signed-off-by: Jens Axboe <axboe@kernel.dk>

src/liburing.h

@@ -115,4 +115,14 @@ static inline void io_uring_prep_poll_remove(struct io_uring_sqe *sqe,
 	sqe->addr = (unsigned long) user_data;
 }
 
+static inline void io_uring_prep_fsync(struct io_uring_sqe *sqe, int fd,
+				       int datasync)
+{
+	memset(sqe, 0, sizeof(*sqe));
+	sqe->opcode = IORING_OP_FSYNC;
+	sqe->fd = fd;
+	if (datasync)
+		sqe->fsync_flags = IORING_FSYNC_DATASYNC;
+}
+
 #endif

test/Makefile

@@ -1,10 +1,10 @@
 CFLAGS ?= -g -O2 -Wall -D_GNU_SOURCE -L../src/
 
-all_targets += io_uring-test io_uring-cp poll poll-cancel ring-leak
+all_targets += io_uring-test io_uring-cp poll poll-cancel ring-leak fsync
 
 all: $(all_targets)
 
-test_srcs := io_uring-test.c io_uring-cp.c poll.c poll-cancel.c ring-leak.c
+test_srcs := io_uring-test.c io_uring-cp.c poll.c poll-cancel.c ring-leak.c fsync.c
 
 test_objs := $(patsubst %.c,%.ol,$(test_srcs))
 
@@ -18,5 +18,7 @@ poll-cancel: poll-cancel.c
 	$(CC) $(CFLAGS) -o $@ poll-cancel.c -luring
 ring-leak: ring-leak.c
 	$(CC) $(CFLAGS) -o $@ ring-leak.c -luring
+fsync: fsync.c
+	$(CC) $(CFLAGS) -o $@ fsync.c -luring
 clean:
 	rm -f $(all_targets) $(test_objs)

test/fsync.c

@@ -0,0 +1,58 @@
+/*
+ * Description: test io_uring fsync handling
+ *
+ */
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "../src/liburing.h"
+
+int main(int argc, char *argv[])
+{
+	struct io_uring_cqe *cqe;
+	struct io_uring_sqe *sqe;
+	struct io_uring ring;
+	char buf[32];
+	int fd, ret;
+
+	sprintf(buf, "./XXXXXX");
+	fd = mkstemp(buf);
+	if (fd < 0) {
+		perror("open");
+		return 1;
+	}
+	
+	ret = io_uring_queue_init(1, &ring, 0);
+	if (ret) {
+		printf("ring setup failed\n");
+		return 1;
+
+	}
+
+	sqe = io_uring_get_sqe(&ring);
+	if (!sqe) {
+		printf("get sqe failed\n");
+		return 1;
+	}
+
+	io_uring_prep_fsync(sqe, fd, 0);
+
+	ret = io_uring_submit(&ring);
+	if (ret <= 0) {
+		printf("child: sqe submit failed\n");
+		return 1;
+	}
+
+	ret = io_uring_wait_completion(&ring, &cqe);
+	if (ret < 0) {
+		printf("child: wait completion %d\n", ret);
+		return 1;
+	}
+
+	unlink(buf);
+	return 0;
+}