add mpath(4), a driver that steals paths to scsi devices if it

thinks they could be available via multiple paths. those stolen
devices are then made available via mpath(4).

this is the minimum amount of code to implement the stealing. it
is generally broken and very brittle, so it is currently disabled.

it is going in so i can work on it in the tree.

2 files changed, 10 insertions, 2 deletions

diff --git a/sys/conf/GENERIC b/sys/conf/GENERIC
index f9522c6c0a6..884da3191bf 100644
--- a/sys/conf/GENERIC
+++ b/sys/conf/GENERIC
@@ -1,4 +1,4 @@
-#	$OpenBSD: GENERIC,v 1.145 2009/06/03 14:45:54 jj Exp $
+#	$OpenBSD: GENERIC,v 1.146 2009/08/09 12:47:23 dlg Exp $
 #
 #	Machine-independent option; used by all architectures for their
 #	GENERIC kernel
@@ -64,6 +64,9 @@ option		PPP_DEFLATE
 option		MROUTING	# Multicast router
 #option		PIM		# Protocol Independent Multicast
 
+#mpath0		at root		# SCSI Multipathing
+#scsibus*	at mpath?
+
 softraid0	at root		# Software RAID
 scsibus*	at softraid?
 
diff --git a/sys/conf/files b/sys/conf/files
index 83c1e1d5028..90f9e43b00b 100644
--- a/sys/conf/files
+++ b/sys/conf/files
@@ -1,4 +1,4 @@
-#	$OpenBSD: files,v 1.468 2009/07/23 15:15:25 jordan Exp $
+#	$OpenBSD: files,v 1.469 2009/08/09 12:47:23 dlg Exp $
 #	$NetBSD: files,v 1.87 1996/05/19 17:17:50 jonathan Exp $
 
 #	@(#)files.newconf	7.5 (Berkeley) 5/10/93
@@ -449,6 +449,11 @@ device	vscsi: scsi
 attach	vscsi at root
 file	dev/vscsi.c			vscsi	needs-flag
 
+# SCSI Multipathing
+device	mpath: scsi
+attach	mpath at root
+file	scsi/mpath.c			mpath	needs-flag
+
 # Software RAID
 device	softraid: scsi
 attach	softraid at root