imsm: initial Intel(R) Matrix Storage Manager support

From: Dan Williams <dan.j.williams@intel.com>

The following now work:
--examine
--examine --brief

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

Makefile

@@ -69,19 +69,19 @@ MAN8DIR = $(MANDIR)/man8
 OBJS =  mdadm.o config.o mdstat.o  ReadMe.o util.o Manage.o Assemble.o Build.o \
 	Create.o Detail.o Examine.o Grow.o Monitor.o dlink.o Kill.o Query.o \
 	Incremental.o \
-	mdopen.o super0.o super1.o super-ddf.o bitmap.o restripe.o sysfs.o \
-	sha1.o mapfile.o crc32.o
+	mdopen.o super0.o super1.o super-ddf.o super-intel.o bitmap.o \
+	restripe.o sysfs.o sha1.o mapfile.o crc32.o sg_io.o
 SRCS =  mdadm.c config.c mdstat.c  ReadMe.c util.c Manage.c Assemble.c Build.c \
 	Create.c Detail.c Examine.c Grow.c Monitor.c dlink.c Kill.c Query.c \
 	Incremental.c \
-	mdopen.c super0.c super1.c super-ddf.c bitmap.c restripe.c sysfs.c \
-	sha1.c mapfile.c crc32.c
+	mdopen.c super0.c super1.c super-ddf.c super-intel.c bitmap.c \
+	restripe.c sysfs.c sha1.c mapfile.c crc32.c sg_io.c
 
 STATICSRC = pwgr.c
 STATICOBJS = pwgr.o
 
 ASSEMBLE_SRCS := mdassemble.c Assemble.c Manage.c config.c dlink.c util.c \
-	super0.c super1.c super-ddf.c sha1.c crc32.c
+	super0.c super1.c super-ddf.c super-intel.c sha1.c crc32.c sg_io.c
 ASSEMBLE_FLAGS:= $(CFLAGS) -DMDASSEMBLE
 ifdef MDASSEMBLE_AUTO
 ASSEMBLE_SRCS += mdopen.c mdstat.c

mdadm.h

@@ -393,6 +393,8 @@ extern struct superswitch {
 	int external;
 } super0, super1, super_ddf, super_ddf_bvd, super_ddf_svd, *superlist[];
 
+extern struct superswitch super_imsm, super_imsm_raid;
+
 struct supertype {
 	struct superswitch *ss;
 	int minor_version;

sg_io.c

@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2007 Intel Corporation
+ *
+ * 	Retrieve drive serial numbers for scsi disks
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+#include <string.h>
+#include <scsi/scsi.h>
+#include <scsi/sg.h>
+#include <sys/ioctl.h>
+
+int scsi_get_serial(int fd, void *buf, size_t buf_len)
+{
+	unsigned char inq_cmd[] = {INQUIRY, 1, 0x80, 0, buf_len, 0};
+	unsigned char sense[32];
+	struct sg_io_hdr io_hdr;
+
+	memset(&io_hdr, 0, sizeof(io_hdr));
+	io_hdr.interface_id = 'S';
+	io_hdr.cmdp = inq_cmd;
+	io_hdr.cmd_len = sizeof(inq_cmd);
+	io_hdr.dxferp = buf;
+	io_hdr.dxfer_len = buf_len;
+	io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
+	io_hdr.sbp = sense;
+	io_hdr.mx_sb_len = sizeof(sense);
+	io_hdr.timeout = 5000;
+
+	return ioctl(fd, SG_IO, &io_hdr);
+}

util.c

@@ -780,7 +780,7 @@ int dev_open(char *dev, int flags)
 	return fd;
 }
 
-struct superswitch *superlist[] = { &super0, &super1, &super_ddf, NULL };
+struct superswitch *superlist[] = { &super0, &super1, &super_ddf, &super_imsm, NULL };
 
 #if !defined(MDASSEMBLE) || defined(MDASSEMBLE) && defined(MDASSEMBLE_AUTO)
 struct supertype *super_by_fd(int fd)