Add test/close-opath.c

This tests whether we can close an O_PATH opened fd. Test program
is an edited version of one from Clay Harris <bugs@claycon.org>, found
here:

https://claycon.org/software/io_uring/tests/close_opath.c

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

2 files changed, 124 insertions, 2 deletions

diff --git a/test/Makefile b/test/Makefile
index 7df550d..93e58f4 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -22,7 +22,7 @@ all_targets += poll poll-cancel ring-leak fsync io_uring_setup io_uring_register
 		short-read openat2 probe shared-wq personality eventfd \
 		send_recv eventfd-ring across-fork sq-poll-kthread splice \
 		lfs-openat lfs-openat-write iopoll d4ae271dfaae-test \
-		eventfd-disable
+		eventfd-disable close-opath
 
 include ../Makefile.quiet
 
@@ -55,7 +55,7 @@ test_srcs := poll.c poll-cancel.c ring-leak.c fsync.c io_uring_setup.c \
 	madvise.c short-read.c openat2.c probe.c shared-wq.c \
 	personality.c eventfd.c eventfd-ring.c across-fork.c sq-poll-kthread.c \
 	splice.c lfs-openat.c lfs-openat-write.c iopoll.c d4ae271dfaae-test.c \
-	eventfd-disable.c
+	eventfd-disable.c close-opath.c
 
 ifdef CONFIG_HAVE_STATX
 test_srcs += statx.c
diff --git a/test/close-opath.c b/test/close-opath.c
new file mode 100644
index 0000000..884bda9
--- /dev/null
+++ b/test/close-opath.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: MIT
+
+#define _GNU_SOURCE 1
+#define _FILE_OFFSET_BITS 64
+
+// Test program for io_uring IORING_OP_CLOSE with O_PATH file.
+// Author: Clayton Harris <bugs@claycon.org>, 2020-06-07
+
+// linux                5.6.14-300.fc32.x86_64
+// gcc                  10.1.1-1.fc32
+// liburing.x86_64      0.5-1.fc32
+
+// gcc -O2 -Wall -Wextra -std=c11 -o close_opath close_opath.c -luring
+// ./close_opath testfilepath
+
+#include <errno.h>
+#include <fcntl.h>
+#include <liburing.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+typedef struct
+{
+	const char *const flnames;
+	const int oflags;
+} oflgs_t;
+
+static int test_io_uring_close(struct io_uring *ring, int fd)
+{
+	struct io_uring_sqe *sqe;
+	struct io_uring_cqe *cqe;
+	int ret;
+
+	sqe = io_uring_get_sqe(ring);
+	if (!sqe) {
+		fprintf(stderr, "io_uring_get_sqe() failed\n");
+		return -ENOENT;
+	}
+
+	io_uring_prep_close(sqe, fd);
+
+	ret = io_uring_submit(ring);
+	if (ret < 0) {
+		fprintf(stderr, "io_uring_submit() failed, errno %d: %s\n",
+			-ret, strerror(-ret));
+		return ret;
+	}
+
+	ret = io_uring_wait_cqe(ring, &cqe);
+	if (ret < 0) {
+		fprintf(stderr, "io_uring_wait_cqe() failed, errno %d: %s\n",
+			-ret, strerror(-ret));
+		return ret;
+	}
+
+	ret = cqe->res;
+	io_uring_cqe_seen(ring, cqe);
+
+	if (ret < 0 && ret != -EOPNOTSUPP) {
+		fprintf(stderr, "io_uring close() failed, errno %d: %s\n",
+			-ret, strerror(-ret));
+		return ret;
+	}
+
+	return 0;
+}
+
+static int open_file(const char *path, const oflgs_t *oflgs)
+{
+	int fd;
+
+	fd = openat(AT_FDCWD, path, oflgs->oflags, 0);
+	if (fd < 0) {
+		int err = errno;
+		fprintf(stderr, "openat(%s, %s) failed, errno %d: %s\n",
+			path, oflgs->flnames, err, strerror(err));
+		return -err;
+	}
+
+	return fd;
+}
+
+int main(int argc, char *argv[])
+{
+	const char *fname = ".";
+	struct io_uring ring;
+	int ret, i;
+	static const oflgs_t oflgs[] = {
+		{ "O_RDONLY", O_RDONLY },
+		{ "O_PATH", O_PATH }
+	};
+
+	ret = io_uring_queue_init(2, &ring, 0);
+	if (ret < 0) {
+		fprintf(stderr, "io_uring_queue_init() failed, errno %d: %s\n",
+			-ret, strerror(-ret));
+		return 0x02;
+	}
+
+#define OFLGS_SIZE (sizeof(oflgs) / sizeof(oflgs[0]))
+
+	ret = 0;
+	for (i = 0; i < OFLGS_SIZE; i++) {
+		int fd;
+
+		fd = open_file(fname, &oflgs[i]);
+		if (fd < 0) {
+			ret |= 0x02;
+			break;
+		}
+
+		/* Should always succeed */
+		if (test_io_uring_close(&ring, fd) < 0)
+			ret |= 0x04 << i;
+	}
+#undef OFLGS_SIZE
+
+	io_uring_queue_exit(&ring);
+	return ret;
+}