MFC r309321:

Add `gmirror create` subcommand, alike to gstripe, gconcat, etc.

It is quite specific mode of operation without storing on-disk metadata.
It can be useful in some cases in combination with some external control
tools handling mirror creation and disks hot-plug.

Sponsored by:	iXsystems, Inc.

2 files changed, 24 insertions, 1 deletions

diff --git a/sbin/geom/class/mirror/geom_mirror.c b/sbin/geom/class/mirror/geom_mirror.c
index 30f5f84..f30b96c 100644
--- a/sbin/geom/class/mirror/geom_mirror.c
+++ b/sbin/geom/class/mirror/geom_mirror.c
@@ -79,6 +79,16 @@ struct g_command class_commands[] = {
 	    "[-adfFhnv] [-b balance] [-s slice] name\n"
 	    "[-v] -p priority name prov"
 	},
+	{ "create", G_FLAG_VERBOSE, NULL,
+	    {
+		{ 'b', "balance", GMIRROR_BALANCE, G_TYPE_STRING },
+		{ 'F', "nofailsync", NULL, G_TYPE_BOOL },
+		{ 'n', "noautosync", NULL, G_TYPE_BOOL },
+		{ 's', "slice", GMIRROR_SLICE, G_TYPE_NUMBER },
+		G_OPT_SENTINEL
+	    },
+	    "[-Fnv] [-b balance] [-s slice] name prov ..."
+	},
 	{ "deactivate", G_FLAG_VERBOSE, NULL, G_NULL_OPTS,
 	    "[-v] name prov ..."
 	},
diff --git a/sbin/geom/class/mirror/gmirror.8 b/sbin/geom/class/mirror/gmirror.8
index fb501ca..d8400f1 100644
--- a/sbin/geom/class/mirror/gmirror.8
+++ b/sbin/geom/class/mirror/gmirror.8
@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd December 27, 2013
+.Dd November 27, 2016
 .Dt GMIRROR 8
 .Os
 .Sh NAME
@@ -43,6 +43,13 @@
 .Op Fl v
 .Ar prov ...
 .Nm
+.Cm create
+.Op Fl Fnv
+.Op Fl b Ar balance
+.Op Fl s Ar slice
+.Ar name
+.Ar prov ...
+.Nm
 .Cm configure
 .Op Fl adfFhnv
 .Op Fl b Ar balance
@@ -170,6 +177,12 @@ Defaults to 4096 bytes.
 .El
 .It Cm clear
 Clear metadata on the given providers.
+.It Cm create
+Similar to
+.Cm label,
+but creates mirror without storing on-disk metadata in last sector.
+This special "manual" operation mode assumes some external control to manage
+mirror detection after reboot, device hot-plug and other external events.
 .It Cm configure
 Configure the given device.
 .Pp