1 files changed, 123 insertions, 0 deletions
diff --git a/usr/src/uts/sparc/zfs/spa_boot.c b/usr/src/uts/sparc/zfs/spa_boot.c
new file mode 100644
index 0000000000..6a20081bd6
--- /dev/null
+++ b/usr/src/uts/sparc/zfs/spa_boot.c
@@ -0,0 +1,123 @@
+/*
+ * 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 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <sys/spa.h>
+#include <sys/bootconf.h>
+
+char *
+spa_get_bootfs()
+{
+	int proplen;
+	char *zfs_bp;
+
+	proplen = BOP_GETPROPLEN(bootops, "zfs-bootfs");
+	if (proplen == 0)
+		return (NULL);
+
+	zfs_bp = kmem_zalloc(proplen, KM_SLEEP);
+	if (BOP_GETPROP(bootops, "zfs-bootfs", zfs_bp) == -1) {
+		kmem_free(zfs_bp, proplen);
+		return (NULL);
+	}
+
+	return (zfs_bp);
+}
+
+void
+spa_free_bootfs(char *bootfs)
+{
+	kmem_free(bootfs, strlen(bootfs) + 1);
+}
+
+/*
+ * Given the boot device physpath, check if the device is in a valid state.
+ * If so, return the configuration from the vdev label.
+ */
+int
+spa_get_rootconf(char *devpath, char **bestdev, nvlist_t **bestconf)
+{
+	nvlist_t *conf = NULL;
+	char *dev = NULL;
+	uint64_t txg = 0;
+	nvlist_t *nvtop, **child;
+	char *type;
+	uint_t children, c;
+
+	spa_check_rootconf(devpath, &dev, &conf, &txg);
+	if (txg == 0 || conf == NULL)
+		return (EINVAL);
+
+	VERIFY(nvlist_lookup_nvlist(conf, ZPOOL_CONFIG_VDEV_TREE,
+	    &nvtop) == 0);
+	VERIFY(nvlist_lookup_string(nvtop, ZPOOL_CONFIG_TYPE, &type) == 0);
+
+	if (strcmp(type, VDEV_TYPE_DISK) == 0) {
+		if (spa_rootdev_validate(nvtop))
+			goto out;
+		else
+			return (EINVAL);
+	}
+
+	ASSERT(strcmp(type, VDEV_TYPE_MIRROR) == 0);
+
+	VERIFY(nvlist_lookup_nvlist_array(nvtop, ZPOOL_CONFIG_CHILDREN,
+	    &child, &children) == 0);
+
+	/*
+	 * Go thru vdevs in the mirror to see if the given device (devpath)
+	 * is in a healthy state. Also check if the given device has the most
+	 * recent txg. Only the device with the most recent txg has valid
+	 * information and can be booted.
+	 */
+	for (c = 0; c < children; c++) {
+		char *physpath;
+
+		if (nvlist_lookup_string(child[c], ZPOOL_CONFIG_PHYS_PATH,
+		    &physpath) != 0)
+			return (EINVAL);
+
+		if (strcmp(devpath, physpath) == 0) {
+			if (!spa_rootdev_validate(child[c]))
+				return (EINVAL);
+		} else {
+			/* get dev with the highest txg */
+			if (spa_rootdev_validate(child[c])) {
+				spa_check_rootconf(physpath, &dev,
+				    &conf, &txg);
+			}
+		}
+	}
+
+	/* Does the given device have the most recent txg? */
+	if (strcmp(devpath, dev) != 0)
+		return (EINVAL);
+out:
+	*bestdev = dev;
+	*bestconf = conf;
+	return (0);
+}