PSARC 2006/370 ZFS Boot Support

5008936 ZFS and/or zvol should support dumps
5070124 dumpadm -d /dev/... does not enforce block device requirement for savecore
6521468 ZFS Boot support Phase 2
6553503 bfu can't find 'rootdev' from /etc/vfstab on a zfs root filesystem
6574993 zfs_mountroot() may need to call clkset() to set the boot_time kstat
6633197 zvol should not permit newfs or createpool while it's in use by swap or dump
6661127 zfs_name_valid() does not support ZFS_TYPE_POOL
6684121 The changes to smf scripts for supporting canmount=noauto will cause a boot failure.

--HG--
rename : usr/src/psm/stand/bootblks/zfs/common/debug-zfs.fth => deleted_files/usr/src/psm/stand/bootblks/zfs/common/debug-zfs.fth
rename : usr/src/psm/stand/bootblks/zfs/common/big-zfs.fth => usr/src/psm/stand/bootblks/zfs/common/fs-zfs.fth

1 files changed, 198 insertions, 0 deletions

diff --git a/usr/src/uts/intel/zfs/spa_boot.c b/usr/src/uts/intel/zfs/spa_boot.c
new file mode 100644
index 0000000000..9407f52353
--- /dev/null
+++ b/usr/src/uts/intel/zfs/spa_boot.c
@@ -0,0 +1,198 @@
+/*
+ * 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/sunddi.h>
+
+char *
+spa_get_bootfs()
+{
+	char *zfs_bp;
+
+	if (ddi_prop_lookup_string(DDI_DEV_T_ANY, ddi_root_node(),
+	    DDI_PROP_DONTPASS, "zfs-bootfs", &zfs_bp) !=
+	    DDI_SUCCESS)
+		return (NULL);
+	return (zfs_bp);
+}
+
+void
+spa_free_bootfs(char *bootfs)
+{
+	ddi_prop_free(bootfs);
+}
+
+/*
+ * Calculate how many device pathnames are in devpath_list.
+ * The devpath_list could look like this:
+ *
+ *	"/pci@1f,0/ide@d/disk@0,0:a /pci@1f,o/ide@d/disk@2,0:a"
+ */
+static int
+spa_count_devpath(char *devpath_list)
+{
+	int numpath;
+	char *tmp_path, *blank;
+
+	numpath = 0;
+	tmp_path = devpath_list;
+
+	/* skip leading blanks */
+	while (*tmp_path == ' ')
+		tmp_path++;
+
+	while ((blank = strchr(tmp_path, ' ')) != NULL) {
+
+		numpath++;
+		/* skip contiguous blanks */
+		while (*blank == ' ')
+			blank++;
+		tmp_path = blank;
+	}
+
+	if (strlen(tmp_path) > 0)
+		numpath++;
+
+	return (numpath);
+}
+
+/*
+ * Only allow booting the device if it has the same vdev information as
+ * the most recently updated vdev (highest txg) and is in a valid state.
+ *
+ * GRUB passes online/active device path names, e.g.
+ *	"/pci@1f,0/ide@d/disk@0,0:a /pci@1f,o/ide@d/disk@2,0:a"
+ * to the kernel. The best vdev should have the same matching online/active
+ * list as what GRUB passes in.
+ */
+static int
+spa_check_devstate(char *devpath_list, char *dev, nvlist_t *conf)
+{
+	nvlist_t *nvtop, **child;
+	uint_t label_path, grub_path, c, children;
+	char *type;
+
+	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)
+		return (spa_rootdev_validate(nvtop)? 0 : EINVAL);
+
+	ASSERT(strcmp(type, VDEV_TYPE_MIRROR) == 0);
+
+	VERIFY(nvlist_lookup_nvlist_array(nvtop, ZPOOL_CONFIG_CHILDREN,
+	    &child, &children) == 0);
+
+	/*
+	 * Check if the devpath_list is the same as the path list in conf.
+	 * If these two lists are different, then the booting device is not an
+	 * up-to-date device that can be booted.
+	 */
+	label_path = 0;
+	for (c = 0; c < children; c++) {
+		char *physpath;
+
+		if (nvlist_lookup_string(child[c], ZPOOL_CONFIG_PHYS_PATH,
+		    &physpath) != 0)
+			return (EINVAL);
+
+		if (spa_rootdev_validate(child[c])) {
+			if (strstr(devpath_list, physpath) == NULL)
+				return (EINVAL);
+			label_path++;
+		} else {
+			char *blank;
+
+			if (blank = strchr(dev, ' '))
+				*blank = '\0';
+			if (strcmp(physpath, dev) == 0)
+				return (EINVAL);
+			if (blank)
+				*blank = ' ';
+		}
+	}
+
+	grub_path = spa_count_devpath(devpath_list);
+
+	if (label_path != grub_path)
+		return (EINVAL);
+
+	return (0);
+}
+
+/*
+ * Given a list of vdev physpath names, pick the vdev with the most recent txg,
+ * and return the point of the device's physpath in the list and the device's
+ * label configuration. The content of the label would be the most recent
+ * updated information.
+ */
+int
+spa_get_rootconf(char *devpath_list, char **bestdev, nvlist_t **bestconf)
+{
+	nvlist_t *conf = NULL;
+	char *dev = NULL;
+	uint64_t txg = 0;
+	char *devpath, *blank;
+
+	devpath = devpath_list;
+	dev = devpath;
+
+	while (devpath[0] == ' ')
+		devpath++;
+
+	while ((blank = strchr(devpath, ' ')) != NULL) {
+		*blank = '\0';
+		spa_check_rootconf(devpath, &dev, &conf, &txg);
+		*blank = ' ';
+
+		while (*blank == ' ')
+			blank++;
+		devpath = blank;
+	}
+
+	/* for the only or the last devpath in the devpath_list */
+	if (strlen(devpath) > 0)
+		spa_check_rootconf(devpath, &dev, &conf, &txg);
+
+	if (conf == NULL)
+		return (EINVAL);
+
+	/*
+	 * dev/conf is the vdev with the most recent txg.
+	 * Check if the device is in a bootable state.
+	 * dev may have a trailing blank since it points to a string
+	 * in the devpath_list.
+	 */
+	if (spa_check_devstate(devpath_list, dev, conf) != 0)
+		return (EINVAL);
+
+	*bestdev = dev;
+	*bestconf = conf;
+	return (0);
+}