1 files changed, 158 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/tests/zfs-tests/cmd/rm_lnkcnt_zero_file.c b/sys/contrib/openzfs/tests/zfs-tests/cmd/rm_lnkcnt_zero_file.c
new file mode 100644
index 000000000000..9aeabb08e02f
--- /dev/null
+++ b/sys/contrib/openzfs/tests/zfs-tests/cmd/rm_lnkcnt_zero_file.c
@@ -0,0 +1,158 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+/*
+ * Copyright (c) 2012 by Delphix. All rights reserved.
+ */
+
+/*
+ * --------------------------------------------------------------------
+ * The purpose of this test is to see if the bug reported (#4723351) for
+ * UFS exists when using a ZFS file system.
+ * --------------------------------------------------------------------
+ *
+ */
+#define	_REENTRANT 1
+#include <stdio.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static char *filebase;
+
+static int
+pickidx(void)
+{
+	return (random() % 1000);
+}
+
+static void *
+mover(void *a)
+{
+	(void) a;
+	char buf[256];
+	int idx, len, ret;
+
+	len = strlen(filebase) + 5;
+
+	for (;;) {
+		idx = pickidx();
+		(void) snprintf(buf, len, "%s.%03d", filebase, idx);
+		ret = rename(filebase, buf);
+		if (ret < 0 && errno != ENOENT)
+			(void) perror("renaming file");
+	}
+
+	return (NULL);
+}
+
+static void *
+cleaner(void *a)
+{
+	(void) a;
+	char buf[256];
+	int idx, len, ret;
+
+	len = strlen(filebase) + 5;
+
+	for (;;) {
+		idx = pickidx();
+		(void) snprintf(buf, len, "%s.%03d", filebase, idx);
+		ret = remove(buf);
+		if (ret < 0 && errno != ENOENT)
+			(void) perror("removing file");
+	}
+
+	return (NULL);
+}
+
+static void *
+writer(void *a)
+{
+	int *fd = (int *)a;
+	int ret;
+
+	for (;;) {
+		if (*fd != -1)
+			(void) close (*fd);
+
+		*fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
+		if (*fd == -1) {
+			perror("fail to open test file, refreshing it");
+			continue;
+		}
+
+		ret = write(*fd, "test\n", 5);
+		if (ret != 5)
+			perror("writing file");
+	}
+
+	return (NULL);
+}
+
+int
+main(int argc, char **argv)
+{
+	int fd;
+	pthread_t tid;
+
+	if (argc == 1) {
+		(void) printf("Usage: %s <filebase>\n", argv[0]);
+		exit(-1);
+	}
+
+	filebase = argv[1];
+	fd = open(filebase, O_APPEND | O_RDWR | O_CREAT, 0644);
+	if (fd < 0) {
+		perror("creating test file");
+		exit(-1);
+	}
+
+	(void) pthread_setconcurrency(4);	/* 3 threads + main */
+	(void) pthread_create(&tid, NULL, mover, NULL);
+	(void) pthread_create(&tid, NULL, cleaner, NULL);
+	(void) pthread_create(&tid, NULL, writer, (void *) &fd);
+
+	for (;;) {
+		int ret;
+		struct stat st;
+
+		ret = stat(filebase, &st);
+		if (ret == 0 && (st.st_nlink > 2 || st.st_nlink < 1)) {
+			(void) printf("st.st_nlink = %d, exiting\n", \
+			    (int)st.st_nlink);
+			exit(0);
+		}
+		(void) sleep(1);
+	}
+
+	return (0);
+}