PSARC 2004/776 device checking for fs utilities

PSARC 2005/461 Device in use checking environment variables
5084421 libdiskmgt needs to detect in use ZFS data
5085739 remove workaround for bug 4725434
6194015 Device in use checking for Solaris utilities-PSARC/2004/776
6261853 libdiskmgt does not work correctly in all cases on amd64
6268374 libdiskmgt allocates incorrect size for readdir_r() dirent argument
6291309 PSARC/2005/461 - libdiskmgt should enable bypassing of inuse checking
6301815 PSARC/2005/461-Need Sun private libdiskmgt flag for use during install to disable sysevent starting

--HG--
rename : usr/src/cmd/format/checkmount.c => usr/src/cmd/format/checkdev.c
rename : usr/src/cmd/format/checkmount.h => usr/src/cmd/format/checkdev.h

1 files changed, 124 insertions, 0 deletions

diff --git a/usr/src/lib/libdiskmgt/common/inuse_zpool.c b/usr/src/lib/libdiskmgt/common/inuse_zpool.c
new file mode 100644
index 0000000000..9913b7ef22
--- /dev/null
+++ b/usr/src/lib/libdiskmgt/common/inuse_zpool.c
@@ -0,0 +1,124 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (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 2005 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+/*
+ * Attempt to dynamically link in the ZFS libzfs.so.1 so that we can
+ * see if there are any ZFS zpools on any of the slices.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <strings.h>
+#include <sys/param.h>
+#include <sys/errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <thread.h>
+#include <synch.h>
+#include <dlfcn.h>
+#include <link.h>
+#include <ctype.h>
+
+#include "libdiskmgt.h"
+#include "disks_private.h"
+
+/*
+ * Pointers to libzfs.so functions that we dynamically resolve.
+ */
+static	int	(*zfsdl_zpool_in_use)(int fd, char **desc, char **name);
+
+static mutex_t			init_lock = DEFAULTMUTEX;
+static rwlock_t			zpool_lock = DEFAULTRWLOCK;
+static	int			initialized = 0;
+
+static void	*init_zpool();
+
+int
+inuse_zpool(char *slice, nvlist_t *attrs, int *errp)
+{
+	int		found = 0;
+	char		*desc, *name;
+	int		fd;
+
+	*errp = 0;
+	if (slice == NULL) {
+	    return (found);
+	}
+
+	(void) mutex_lock(&init_lock);
+
+	/*
+	 * Dynamically load libzfs
+	 */
+	if (!initialized) {
+		if (!init_zpool()) {
+			(void) mutex_unlock(&init_lock);
+			return (found);
+		}
+		initialized = 1;
+	}
+	(void) mutex_unlock(&init_lock);
+	(void) rw_rdlock(&zpool_lock);
+	if ((fd = open(slice, O_RDONLY)) > 0) {
+		if (zfsdl_zpool_in_use(fd, &desc, &name)) {
+			libdiskmgt_add_str(attrs, DM_USED_BY,
+				DM_USE_ZPOOL, errp);
+			libdiskmgt_add_str(attrs, DM_USED_NAME,
+				name, errp);
+			found = 1;
+		}
+	}
+	(void) rw_unlock(&zpool_lock);
+
+	return (found);
+}
+
+/*
+ * Try to dynamically link the zfs functions we need.
+ */
+static void*
+init_zpool()
+{
+	void	*lh = NULL;
+
+	if ((lh = dlopen("libzfs.so", RTLD_NOW)) == NULL) {
+		return (lh);
+	}
+	/*
+	 * Instantiate the functions needed to get zpool configuration
+	 * data
+	 */
+	if ((zfsdl_zpool_in_use = (int (*)(int, char **, char **))dlsym(lh,
+	    "zpool_in_use")) == NULL) {
+		(void) dlclose(lh);
+		return (NULL);
+	}
+
+	return (lh);
+}