[PATCH] Add multipath "extra" program from Christophe Varoqui, <christophe.varoqui@free.fr>

11 files changed, 2859 insertions, 0 deletions

diff --git a/extras/multipath/AUTHOR b/extras/multipath/AUTHOR
new file mode 100644
index 0000000000..4e8eeef5c8
--- /dev/null
+++ b/extras/multipath/AUTHOR
@@ -0,0 +1 @@
+Christophe Varoqui, <christophe.varoqui@free.fr>
diff --git a/extras/multipath/COPYING b/extras/multipath/COPYING
new file mode 100644
index 0000000000..9e31bbf0b3
--- /dev/null
+++ b/extras/multipath/COPYING
@@ -0,0 +1,483 @@
+
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diff --git a/extras/multipath/ChangeLog b/extras/multipath/ChangeLog
new file mode 100644
index 0000000000..f3014cf01e
--- /dev/null
+++ b/extras/multipath/ChangeLog
@@ -0,0 +1,3 @@
+2003-09-18  Christophe Varoqui <christophe.varoqui@free.fr>
+	* multipath 0.0.1 released.
+	* Initial release.
diff --git a/extras/multipath/Makefile b/extras/multipath/Makefile
new file mode 100644
index 0000000000..0835d7a2c6
--- /dev/null
+++ b/extras/multipath/Makefile
@@ -0,0 +1,34 @@
+# Makefile
+#
+# Copyright (C) 2003 Christophe Varoqui, <christophe.varoqui@free.fr>
+
+EXEC = multipath
+
+prefix      = /usr/local
+exec_prefix = ${prefix}
+bindir     = ${exec_prefix}/bin
+
+CC = gcc
+CFLAGS = -g -O2 -Wall -Wunused -Wstrict-prototypes
+LDFLAGS = -lsysfs -ldevmapper
+
+OBJS = main.o sg_err.o
+
+all:	$(EXEC)
+	strip $(EXEC)
+	@echo ""
+	@echo "Make complete"
+
+$(EXEC): $(OBJS)
+	$(CC) $(OBJS) -o $(EXEC) $(LDFLAGS)
+
+clean:
+	rm -f core *.o $(EXEC)
+
+install:
+	install -d $(bindir)
+	install -m 755 $(EXEC) $(bindir)/
+
+# Code dependencies
+main.o: main.c main.h sg_err.h sg_include.h
+sg_err.o: sg_err.c sg_err.h sg_include.h
diff --git a/extras/multipath/README b/extras/multipath/README
new file mode 100644
index 0000000000..6a5637de4b
--- /dev/null
+++ b/extras/multipath/README
@@ -0,0 +1,82 @@
+Dependancies :
+==============
+
+o libdevmapper : comes with device-mapper-XXXX.tar.gz
+  See www.sistina.com
+o libsysfs : comes with sysutils
+  See ftp.kernel.org/pub/linux/utils/kernel/hotplug/
+
+How it works :
+==============
+
+Fill the all_paths array. Each path store this info :
+
+struct path {
+        char dev[FILE_NAME_SIZE];
+        char sg_dev[FILE_NAME_SIZE];
+        struct scsi_idlun scsi_id;
+        struct sg_id sg_id;
+        int state;
+        char wwid[WWID_SIZE];
+};
+
+scsi_id, sg_dev and sg_id are only really useful for 2.4 
+kernels, for which SG cmnds must go through sg devs.
+In 2.5+ we have the nice opportunity to send SG cmnds
+through SCSI bdevs.
+
+For 2.4 compat, we pivot on idlun tupple to map sg devs
+to SCSI bdevs.
+
+2.4 does not do device enumeration, so we must scan a
+defined number of sg devs and scsi bdevs. Good enough.
+In 2.5+, we rely on libsysfs (sysutils) to access to
+sysfs device enums.
+
+the wwid is retrieved by a switch fonction. Only White
+Listed HW can filled this field. For now only 
+StorageWorks HW is White Listed. (See notes)
+
+When all_paths is filled, we coalesce the paths and store
+the result in mp array. Each mp is a struct like this :
+
+struct multipath {
+        char wwid[WWID_SIZE];
+        int npaths;
+        int pindex[MAX_MP_PATHS];
+};
+
+When mp is filled, the device maps are fed to the kernel
+through libdevmapper. Stale paths (failed TUR) are 
+discarded.
+
+Notes :
+=======
+
+o make sure you have enough /dev/sg* nodes
+  (/dev/MAKEDEV if necesary)
+
+o path coalescing relies on a path unique id being found.
+  This unique id, lacking a standard method, is vendor
+  specific. A switch function (get_unique_id) is present
+  and an example function is provided for storageworks
+  arrays (get_storageworks_wwid). Feel free to enrich
+  with hardware you have at hand :)
+
+o Something goes wrong with sd.o, qla2200 & dm-mod
+  refcounting : I can't unload these modules after exec.
+
+o The kernel does NOT manage properly ghosts paths
+  with StorageWorks HW. Seems nobody cares after a load
+  of posts to linux-scsi.
+
+o 2.4.21 version of DM does not like even segment size.
+  if you enconter pbs with this, upgrade DM.
+
+Credits :
+=========
+
+o Heavy cut'n paste from sg_utils. Thanks goes to D. 
+  Gilbert.
+o Light cut'n paste from dmsetup. Thanks Joe Thornber.
+o Greg KH for the nice sysfs API.
diff --git a/extras/multipath/VERSION b/extras/multipath/VERSION
new file mode 100644
index 0000000000..bbdeab6222
--- /dev/null
+++ b/extras/multipath/VERSION
@@ -0,0 +1 @@
+0.0.5
diff --git a/extras/multipath/main.c b/extras/multipath/main.c
new file mode 100644
index 0000000000..0ed74c52a9
--- /dev/null
+++ b/extras/multipath/main.c
@@ -0,0 +1,741 @@
+/*
+ * Soft:        Description here...
+ *
+ * Version:     $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
+ *
+ * Author:      Copyright (C) 2003 Christophe Varoqui
+ *
+ *              This program is distributed in the hope that 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.
+ *
+ *              This program is free software; you can redistribute it and/or
+ *              modify it under the terms of the GNU General Public License
+ *              as published by the Free Software Foundation; either version
+ *              2 of the License, or (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <linux/kdev_t.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <libsysfs.h>
+#include <libdevmapper.h>
+#include "main.h"
+
+static int
+do_inq(int sg_fd, int cmddt, int evpd, unsigned int pg_op,
+       void *resp, int mx_resp_len, int noisy)
+{
+	int res;
+	unsigned char inqCmdBlk[INQUIRY_CMDLEN] =
+	    { INQUIRY_CMD, 0, 0, 0, 0, 0 };
+	unsigned char sense_b[SENSE_BUFF_LEN];
+	struct sg_io_hdr io_hdr;
+
+	if (cmddt)
+		inqCmdBlk[1] |= 2;
+	if (evpd)
+		inqCmdBlk[1] |= 1;
+	inqCmdBlk[2] = (unsigned char) pg_op;
+	inqCmdBlk[4] = (unsigned char) mx_resp_len;
+	memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
+	io_hdr.interface_id = 'S';
+	io_hdr.cmd_len = sizeof (inqCmdBlk);
+	io_hdr.mx_sb_len = sizeof (sense_b);
+	io_hdr.dxfer_direction = SG_DXFER_FROM_DEV;
+	io_hdr.dxfer_len = mx_resp_len;
+	io_hdr.dxferp = resp;
+	io_hdr.cmdp = inqCmdBlk;
+	io_hdr.sbp = sense_b;
+	io_hdr.timeout = DEF_TIMEOUT;
+
+	if (ioctl(sg_fd, SG_IO, &io_hdr) < 0) {
+		perror("SG_IO (inquiry) error");
+		return -1;
+	}
+	res = sg_err_category3(&io_hdr);
+	switch (res) {
+	case SG_ERR_CAT_CLEAN:
+	case SG_ERR_CAT_RECOVERED:
+		return 0;
+	default:
+		return -1;
+	}
+}
+
+static int
+do_tur(int fd)
+{
+	unsigned char turCmdBlk[TUR_CMD_LEN] = { 0x00, 0, 0, 0, 0, 0 };
+	struct sg_io_hdr io_hdr;
+	unsigned char sense_buffer[32];
+
+	memset(&io_hdr, 0, sizeof (struct sg_io_hdr));
+	io_hdr.interface_id = 'S';
+	io_hdr.cmd_len = sizeof (turCmdBlk);
+	io_hdr.mx_sb_len = sizeof (sense_buffer);
+	io_hdr.dxfer_direction = SG_DXFER_NONE;
+	io_hdr.cmdp = turCmdBlk;
+	io_hdr.sbp = sense_buffer;
+	io_hdr.timeout = 20000;
+	io_hdr.pack_id = 0;
+	if (ioctl(fd, SG_IO, &io_hdr) < 0) {
+		close(fd);
+		return 0;
+	}
+	if (io_hdr.info & SG_INFO_OK_MASK) {
+		return 0;
+	}
+	return 1;
+}
+
+static void
+sprint_wwid(char * buff, const char * str)
+{
+	int i;
+	const char *p;
+	char *cursor;
+	unsigned char c;
+
+	p = str;
+	cursor = buff;
+	for (i = 0; i <= WWID_SIZE / 2 - 1; i++) {
+		c = *p++;
+		sprintf(cursor, "%.2x", (int) (unsigned char) c);
+		cursor += 2;
+	}
+	buff[WWID_SIZE - 1] = '\0';
+}
+
+static int
+get_lun_strings(int fd, struct path * mypath)
+{
+	char buff[36];
+
+	if (0 == do_inq(fd, 0, 0, 0, buff, 36, 1)) {
+		memcpy(mypath->vendor_id, &buff[8], 8);
+		memcpy(mypath->product_id, &buff[16], 16);
+		memcpy(mypath->rev, &buff[32], 4);
+		return 1;
+	}
+	return 0;
+}
+
+/*
+static int
+get_serial (int fd, char * str)
+{
+	char buff[MX_ALLOC_LEN + 1];
+	int len;
+
+	if (0 == do_inq(fd, 0, 1, 0x80, buff, MX_ALLOC_LEN, 0)) {
+		len = buff[3];
+		if (len > 0) {
+			memcpy(str, buff + 4, len);
+			buff[len] = '\0';
+		}
+		return 1;
+	}
+	return 0;
+}
+*/
+
+/* hardware vendor specifics : add support for new models below */
+static int
+get_storageworks_wwid(int fd, char *str)
+{
+	char buff[64];
+
+	if (0 == do_inq(fd, 0, 1, 0x83, buff, sizeof (buff), 1)) {
+		sprint_wwid(str, &buff[8]);
+		return 1;
+	}
+	return 0;
+}
+
+/* White list switch */
+static int
+get_unique_id(int fd, struct path * mypath)
+{
+	if (strncmp(mypath->product_id, "HSV110 (C)COMPAQ", 16) == 0 ||
+	    strncmp(mypath->product_id, "HSG80           ", 16) == 0) {
+		get_storageworks_wwid(fd, mypath->wwid);
+		return 0;
+	}
+
+	return 1;
+}
+
+static void
+basename(char * str1, char * str2)
+{
+	char *p = str1 + (strlen(str1) - 1);
+
+	while (*--p != '/')
+		continue;
+	strcpy(str2, ++p);
+}
+
+static int
+get_all_paths_sysfs(struct env * conf, struct path * all_paths)
+{
+	int k=0;
+	int sg_fd;
+	struct sysfs_directory * sdir;
+	struct sysfs_directory * devp;
+	struct sysfs_dlink * linkp;
+	char buff[FILE_NAME_SIZE];
+
+	char block_path[FILE_NAME_SIZE];
+
+	sprintf(block_path, "%s/block", conf->sysfs_path);
+	sdir = sysfs_open_directory(block_path);
+	sysfs_read_directory(sdir);
+	devp = sdir->subdirs;
+	while (devp != NULL) {
+		sysfs_read_directory(devp);
+		linkp = devp->links;
+		while (linkp != NULL) {
+			if (!strncmp(linkp->name, "device", 6))
+				break;
+			linkp = linkp->next;
+		}
+		if (linkp == NULL) {
+			devp = devp->next;
+			continue;
+		}
+
+		basename(devp->path, buff);
+		sprintf(all_paths[k].sg_dev, "/dev/%s", buff);
+		strcpy(all_paths[k].dev, all_paths[k].sg_dev);
+		if ((sg_fd = open(all_paths[k].sg_dev, O_RDONLY)) < 0) {
+			devp = devp->next;
+			continue;
+		}
+		get_lun_strings(sg_fd, &all_paths[k]);
+		get_unique_id(sg_fd, &all_paths[k]);
+		all_paths[k].state = do_tur(sg_fd);
+		close(sg_fd);
+		basename(linkp->target->path, buff);
+		sscanf(buff, "%i:%i:%i:%i",
+			&all_paths[k].sg_id.host_no,
+			&all_paths[k].sg_id.channel,
+			&all_paths[k].sg_id.scsi_id,
+			&all_paths[k].sg_id.lun);
+		k++;
+		devp = devp->next;
+	}
+	sysfs_close_directory(sdir);
+
+	return 0;
+}
+
+static int
+get_all_paths_nosysfs(struct env * conf, struct path * all_paths,
+		      struct scsi_dev * all_scsi_ids)
+{
+	int k, i, sg_fd;
+	char buff[FILE_NAME_SIZE];
+	char file_name[FILE_NAME_SIZE];
+
+	for (k = 0; k < conf->max_devs; k++) {
+		strcpy(file_name, "/dev/sg");
+		sprintf(buff, "%d", k);
+		strncat(file_name, buff, FILE_NAME_SIZE);
+		strcpy(all_paths[k].sg_dev, file_name);
+		if ((sg_fd = open(file_name, O_RDONLY)) < 0)
+			continue;
+		get_lun_strings(sg_fd, &all_paths[k]);
+		get_unique_id(sg_fd, &all_paths[k]);
+		all_paths[k].state = do_tur(sg_fd);
+		if (0 > ioctl(sg_fd, SG_GET_SCSI_ID, &(all_paths[k].sg_id)))
+			printf("device %s failed on sg ioctl, skip\n",
+			       file_name);
+
+		close(sg_fd);
+
+		for (i = 0; i < conf->max_devs; i++) {
+			if ((all_paths[k].sg_id.host_no ==
+			     all_scsi_ids[i].host_no)
+			    && (all_paths[k].sg_id.scsi_id ==
+				(all_scsi_ids[i].scsi_id.dev_id & 0xff))
+			    && (all_paths[k].sg_id.lun ==
+				((all_scsi_ids[i].scsi_id.dev_id >> 8) & 0xff))
+			    && (all_paths[k].sg_id.channel ==
+				((all_scsi_ids[i].scsi_id.
+				  dev_id >> 16) & 0xff))) {
+				strcpy(all_paths[k].dev, all_scsi_ids[i].dev);
+				break;
+			}
+		}
+	}
+	return 0;
+}
+
+static int
+get_all_scsi_ids(struct env * conf, struct scsi_dev * all_scsi_ids)
+{
+	int k, big, little, res, host_no, fd;
+	char buff[64];
+	char fname[FILE_NAME_SIZE];
+	struct scsi_idlun my_scsi_id;
+
+	for (k = 0; k < conf->max_devs; k++) {
+		strcpy(fname, "/dev/sd");
+		if (k < 26) {
+			buff[0] = 'a' + (char) k;
+			buff[1] = '\0';
+			strcat(fname, buff);
+		} else if (k <= 255) {	/* assumes sequence goes x,y,z,aa,ab,ac etc */
+			big = k / 26;
+			little = k - (26 * big);
+			big = big - 1;
+
+			buff[0] = 'a' + (char) big;
+			buff[1] = 'a' + (char) little;
+			buff[2] = '\0';
+			strcat(fname, buff);
+		} else
+			strcat(fname, "xxxx");
+
+		if ((fd = open(fname, O_RDONLY)) < 0)
+			continue;
+
+		res = ioctl(fd, SCSI_IOCTL_GET_IDLUN, &my_scsi_id);
+		if (res < 0) {
+			close(fd);
+			printf("Could not get scsi idlun\n");
+			continue;
+		}
+
+		res = ioctl(fd, SCSI_IOCTL_GET_BUS_NUMBER, &host_no);
+		if (res < 0) {
+			close(fd);
+			printf("Could not get host_no\n");
+			continue;
+		}
+
+		close(fd);
+
+		strcpy(all_scsi_ids[k].dev, fname);
+		all_scsi_ids[k].scsi_id = my_scsi_id;
+		all_scsi_ids[k].host_no = host_no;
+	}
+	return 0;
+}
+
+/* print_path style */
+#define ALL	0
+#define NOWWID	1
+
+static void
+print_path(struct path * all_paths, int k, int style)
+{
+	if (style != NOWWID)
+		printf("%s ", all_paths[k].wwid);
+	else
+		printf(" \\_");
+	printf("(%i %i %i %i) ",
+	       all_paths[k].sg_id.host_no,
+	       all_paths[k].sg_id.channel,
+	       all_paths[k].sg_id.scsi_id, all_paths[k].sg_id.lun);
+	printf("%s ", all_paths[k].sg_dev);
+	printf("op:%i ", all_paths[k].state);
+	printf("%s ", all_paths[k].dev);
+	printf("[%.16s]\n", all_paths[k].product_id);
+}
+
+static void
+print_all_path(struct env * conf, struct path * all_paths)
+{
+	int k;
+	char empty_buff[WWID_SIZE];
+
+	memset(empty_buff, 0, WWID_SIZE);
+	for (k = 0; k < conf->max_devs; k++) {
+		if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
+			continue;
+		print_path(all_paths, k, ALL);
+	}
+}
+
+static void
+print_all_mp(struct path * all_paths, struct multipath * mp, int nmp)
+{
+	int k, i;
+
+	for (k = 0; k <= nmp; k++) {
+		printf("%s\n", mp[k].wwid);
+		for (i = 0; i <= mp[k].npaths; i++)
+			print_path(all_paths, PINDEX(k,i), NOWWID);
+	}
+}
+
+static int
+coalesce_paths(struct env * conf, struct multipath * mp,
+	       struct path * all_paths)
+{
+	int k, i, nmp, np, already_done;
+	char empty_buff[WWID_SIZE];
+
+	nmp = -1;
+	already_done = 0;
+	memset(empty_buff, 0, WWID_SIZE);
+
+	for (k = 0; k < conf->max_devs - 1; k++) {
+		/* skip this path if no unique id has been found */
+		if (memcmp(empty_buff, all_paths[k].wwid, WWID_SIZE) == 0)
+			continue;
+		np = 0;
+
+		for (i = 0; i <= nmp; i++) {
+			if (0 == strcmp(mp[i].wwid, all_paths[k].wwid))
+				already_done = 1;
+		}
+
+		if (already_done) {
+			already_done = 0;
+			continue;
+		}
+
+		nmp++;
+		strcpy(mp[nmp].wwid, all_paths[k].wwid);
+		PINDEX(nmp,np) = k;
+
+		for (i = k + 1; i < conf->max_devs; i++) {
+			if (0 == strcmp(all_paths[k].wwid, all_paths[i].wwid)) {
+				np++;
+				PINDEX(nmp,np) = i;
+				mp[nmp].npaths = np;
+			}
+		}
+	}
+	return nmp;
+}
+
+static long
+get_disk_size (struct env * conf, char * dev) {
+	long size;
+	int fd;
+	char attr_path[FILE_NAME_SIZE];
+	char buff[FILE_NAME_SIZE];
+	char basedev[FILE_NAME_SIZE];
+
+	if(conf->with_sysfs) {
+		basename(dev, basedev);
+		sprintf(attr_path, "%s/block/%s/size",
+			conf->sysfs_path, basedev);
+		if (0 > sysfs_read_attribute_value(attr_path, buff,
+					 FILE_NAME_SIZE * sizeof(char)))
+			return -1;
+		size = atoi(buff);
+		return size;
+	} else {
+		if ((fd = open(dev, O_RDONLY)) < 0)
+			return -1;
+		if(!ioctl(fd, BLKGETSIZE, &size))
+			return size;
+	}
+	return -1;
+}
+
+static int
+make_dm_node(char * str)
+{
+	int r = 0;
+	dev_t dev;
+	char buff[FILE_NAME_SIZE];
+	int major, minor;
+	struct dm_names * names;
+        unsigned next = 0;
+	struct dm_task *dmt;
+
+	if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
+		return 0;
+
+	if (!dm_task_run(dmt))
+		goto out;
+
+	if (!(names = dm_task_get_names(dmt)))
+		goto out;
+
+	if (!names->dev) {
+		r = 1;
+		goto out;
+	}
+
+        do {
+		if (0 == strcmp(names->name, str))
+			break;
+                next = names->next;
+                names = (void *) names + next;
+        } while (next);
+
+	major = (int) MAJOR(names->dev);
+	minor = (int) MINOR(names->dev);
+
+	dev = major << sizeof(dev_t);
+	dev = dev | minor;
+	sprintf(buff, "/dev/mapper/%s", str);
+	unlink(buff);
+	mknod(buff, 0600 | S_IFBLK, dev);
+
+	out:
+	dm_task_destroy(dmt);
+	return r;
+
+}
+
+/* future use ?
+static int
+del_map(char * str) {
+	struct dm_task *dmt;
+
+	if (!(dmt = dm_task_create(DM_DEVICE_REMOVE)))
+		return 0;
+	if (!dm_task_set_name(dmt, str))
+		goto delout;
+	if (!dm_task_run(dmt))
+		goto delout;
+
+	printf("Deleted device map : %s\n", str);
+
+	delout:
+	dm_task_destroy(dmt);
+	return 1;
+}
+*/
+
+static int
+add_map(struct env * conf, struct path * all_paths,
+	struct multipath * mp, int index, int op)
+{
+	char params[255];
+	char * params_p;
+	struct dm_task *dmt;
+	int i, np;
+	long size = -1;
+
+	if (!(dmt = dm_task_create(op)))
+		return 0;
+
+	if (!dm_task_set_name(dmt, mp[index].wwid))
+		goto addout;
+	params_p = &params[0];
+
+	np = 0;
+	for (i=0; i<=mp[index].npaths; i++) {
+		if ((1 == all_paths[PINDEX(index,i)].state) &&
+			(0 == all_paths[PINDEX(index,i)].sg_id.scsi_type))
+			np++;
+	}
+	if (np == 0)
+		goto addout;
+	params_p += sprintf(params_p, "%i 32", np);
+	
+	for (i=0; i<=mp[index].npaths; i++) {
+		if (( 0 == all_paths[PINDEX(index,i)].state) ||
+			(0 != all_paths[PINDEX(index,i)].sg_id.scsi_type))
+			continue;
+		if (size < 0)
+			size = get_disk_size(conf, all_paths[PINDEX(index,0)].dev);
+		params_p += sprintf(params_p, " %s %i",
+			all_paths[PINDEX(index,i)].dev, 0);
+	}
+
+	if (size < 0)
+		goto addout;
+
+	if (!conf->quiet) {
+		if (op == DM_DEVICE_RELOAD)
+			printf("U|");
+		if (op == DM_DEVICE_CREATE)
+			printf("N|");
+		printf("%s : 0 %li %s %s\n",
+			mp[index].wwid, size, DM_TARGET, params);
+	}
+
+	if (!dm_task_add_target(dmt, 0, size, DM_TARGET, params))
+		goto addout;
+
+	if (!dm_task_run(dmt))
+		goto addout;
+
+
+	make_dm_node(mp[index].wwid);
+
+	addout:
+	dm_task_destroy(dmt);
+	return 1;
+}
+
+/*
+static int
+get_table(const char * str)
+{
+	int r = 0;
+	struct dm_task *dmt;
+	void *next = NULL;
+	uint64_t start, length;
+	char *target_type = NULL;
+	char *params;
+
+        if (!(dmt = dm_task_create(DM_DEVICE_TABLE)))
+                return 0;
+
+        if (!dm_task_set_name(dmt, str))
+                goto out;
+
+        if (!dm_task_run(dmt))
+                goto out;
+
+        do {
+                next = dm_get_next_target(dmt, next, &start, &length,
+                                          &target_type, &params);
+                if (target_type) {
+                        printf("%" PRIu64 " %" PRIu64 " %s %s\n",
+                               start, length, target_type, params);
+                }
+        } while (next);
+
+        r = 1;
+
+      out:
+        dm_task_destroy(dmt);
+        return r;
+
+}
+*/
+
+static int
+map_present(char * str)
+{
+        int r = 0;
+	struct dm_task *dmt;
+        struct dm_names *names;
+        unsigned next = 0;
+
+	if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
+		return 0;
+
+	if (!dm_task_run(dmt))
+		goto out;
+
+	if (!(names = dm_task_get_names(dmt)))
+		goto out;
+
+	if (!names->dev) {
+		goto out;
+	}
+
+	do {
+		if (0 == strcmp(names->name, str))
+			r = 1;
+		next = names->next;
+		names = (void *) names + next;
+	} while (next);
+
+	out:
+	dm_task_destroy(dmt);
+	return r;
+}
+
+static void
+usage(char * progname)
+{
+	fprintf(stderr, VERSION_STRING);
+	fprintf(stderr, "Usage: %s [-v|-q] [-d] [-m max_devs]\n", progname);
+	fprintf(stderr, "\t-v\t\tverbose, print all paths and multipaths\n");
+	fprintf(stderr, "\t-q\t\tquiet, no output at all\n");
+	fprintf(stderr, "\t-d\t\tdry run, do not create or update devmaps\n");
+	fprintf(stderr, "\t-m max_devs\tscan {max_devs} devices at most\n");
+	exit(1);
+}
+
+int
+main(int argc, char *argv[])
+{
+	struct multipath * mp;
+	struct path * all_paths;
+	struct scsi_dev * all_scsi_ids;
+	struct env conf;
+	int i, k, nmp;
+
+	/* Default behaviour */
+	conf.max_devs = MAX_DEVS;
+	conf.dry_run = 0;	/* 1 == Do not Create/Update devmaps */
+	conf.verbose = 0;	/* 1 == Print all_paths and mp */
+	conf.quiet = 0;		/* 1 == Do not even print devmaps */
+	conf.with_sysfs = 0;	/* Default to compat / suboptimal behaviour */
+
+	/* kindly provided by libsysfs */
+	if (0 == sysfs_get_mnt_path(conf.sysfs_path, FILE_NAME_SIZE))
+		conf.with_sysfs = 1;
+
+	for (i = 1; i < argc; ++i) {
+		if (0 == strcmp("-v", argv[i])) {
+			if (conf.quiet == 1)
+				usage(argv[0]);
+			conf.verbose = 1;
+		} else if (0 == strcmp("-m", argv[i])) {
+			conf.max_devs = atoi(argv[++i]);
+			if (conf.max_devs < 2)
+				usage(argv[0]);
+		} else if (0 == strcmp("-q", argv[i])) {
+			if (conf.verbose == 1)
+				usage(argv[0]);
+			conf.quiet = 1;
+		} else if (0 == strcmp("-d", argv[i]))
+			conf.dry_run = 1;
+		else if (*argv[i] == '-') {
+			fprintf(stderr, "Unknown switch: %s\n", argv[i]);
+			usage(argv[0]);
+		} else if (*argv[i] != '-') {
+			fprintf(stderr, "Unknown argument\n");
+			usage(argv[0]);
+		}
+
+	}
+
+	/* dynamic allocations */
+	mp = malloc(conf.max_devs * sizeof(struct multipath));
+	all_paths = malloc(conf.max_devs * sizeof(struct path));
+	all_scsi_ids = malloc(conf.max_devs * sizeof(struct scsi_dev));
+	if (mp == NULL || all_paths == NULL || all_scsi_ids == NULL)
+		exit(1);
+
+	if (!conf.with_sysfs) {
+		get_all_scsi_ids(&conf, all_scsi_ids);
+		get_all_paths_nosysfs(&conf, all_paths, all_scsi_ids);
+	} else {
+		get_all_paths_sysfs(&conf, all_paths);
+	}
+	nmp = coalesce_paths(&conf, mp, all_paths);
+
+	if (conf.verbose) {
+		print_all_path(&conf, all_paths);
+		printf("\n");
+		print_all_mp(all_paths, mp, nmp);
+		printf("\n");
+	}
+
+	if (conf.dry_run)
+		exit(0);
+
+	for (k=0; k<=nmp; k++) {
+		if (map_present(mp[k].wwid)) {
+			add_map(&conf, all_paths, mp, k, DM_DEVICE_RELOAD);
+		} else {
+			add_map(&conf, all_paths, mp, k, DM_DEVICE_CREATE);
+		}
+	}
+	exit(0);
+}
diff --git a/extras/multipath/main.h b/extras/multipath/main.h
new file mode 100644
index 0000000000..43a24ac7bc
--- /dev/null
+++ b/extras/multipath/main.h
@@ -0,0 +1,111 @@
+/*
+ * Soft:        Description here...
+ *
+ * Version:     $Id: main.h,v 0.0.1 2003/09/18 15:13:38 cvaroqui Exp $
+ *
+ * Author:      Copyright (C) 2003 Christophe Varoqui
+ *
+ *              This program is distributed in the hope that 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.
+ *
+ *              This program is free software; you can redistribute it and/or
+ *              modify it under the terms of the GNU General Public License
+ *              as published by the Free Software Foundation; either version
+ *              2 of the License, or (at your option) any later version.
+ */
+
+#ifndef _MAIN_H
+#define _MAIN_H
+
+/* local includes */
+#include "sg_include.h"
+#include "sg_err.h"
+
+/* global defs */
+#define WWID_SIZE	33
+#define MAX_DEVS	128
+#define MAX_MP		MAX_DEVS / 2
+#define MAX_MP_PATHS	MAX_DEVS / 4
+#define FILE_NAME_SIZE	256
+#define INQUIRY_CMDLEN	6
+#define INQUIRY_CMD	0x12
+#define SENSE_BUFF_LEN	32
+#define DEF_TIMEOUT	60000
+#define EBUFF_SZ	256
+#define TUR_CMD_LEN	6
+#define MX_ALLOC_LEN	255
+#define BLKGETSIZE      _IO(0x12,96)
+#define DM_TARGET	"striped"
+
+#define PINDEX(x,y)	mp[(x)].pindex[(y)]
+
+/* global types */
+struct scsi_idlun {
+	int dev_id;
+	int host_unique_id;
+	int host_no;
+};
+
+struct sg_id {
+	int host_no;
+	int channel;
+	int scsi_id;
+	int lun;
+	int scsi_type;
+	short h_cmd_per_lun;
+	short d_queue_depth;
+	int unused1;
+	int unused2;
+};
+
+struct scsi_dev {
+	char dev[FILE_NAME_SIZE];
+	struct scsi_idlun scsi_id;
+	int host_no;
+};
+
+struct path {
+	char dev[FILE_NAME_SIZE];
+	char sg_dev[FILE_NAME_SIZE];
+	struct scsi_idlun scsi_id;
+	struct sg_id sg_id;
+	int state;
+	char wwid[WWID_SIZE];
+	char vendor_id[8];
+	char product_id[16];
+	char rev[4];
+};
+
+struct multipath {
+	char wwid[WWID_SIZE];
+	int npaths;
+	int pindex[MAX_MP_PATHS];
+};
+
+struct env {
+	int max_devs;
+	int verbose;
+	int quiet;
+	int dry_run;
+	int with_sysfs;
+	char sysfs_path[FILE_NAME_SIZE];
+};
+
+/* Build version */
+#define PROG    "multipath"
+
+#define VERSION_CODE 0x000005
+#define DATE_CODE    0x120903
+
+#define MULTIPATH_VERSION(version)	\
+	(version >> 16) & 0xFF,		\
+	(version >> 8) & 0xFF,		\
+	version & 0xFF
+
+#define VERSION_STRING PROG" v%d.%d.%d (%.2d/%.2d, 20%.2d)\n",	\
+                MULTIPATH_VERSION(VERSION_CODE),		\
+                MULTIPATH_VERSION(DATE_CODE)
+
+#endif
diff --git a/extras/multipath/sg_err.c b/extras/multipath/sg_err.c
new file mode 100644
index 0000000000..8a332cd8c6
--- /dev/null
+++ b/extras/multipath/sg_err.c
@@ -0,0 +1,1197 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "sg_include.h"
+#include "sg_err.h"
+
+
+/* This file is a huge cut, paste and hack from linux/drivers/scsi/constant.c
+*  which I guess was written by:
+*         Copyright (C) 1993, 1994, 1995 Eric Youngdale
+
+* The rest of this is:
+*  Copyright (C) 1999 - 2003 D. Gilbert
+*
+*  This program is free software; you can redistribute it and/or modify
+*  it under the terms of the GNU General Public License as published by
+*  the Free Software Foundation; either version 2, or (at your option)
+*  any later version.
+*
+*  ASCII values for a number of symbolic constants, printing functions, etc.
+*
+*  Some of the tables have been updated for SCSI 2.
+*  Additions for SCSI 3+ (SPC-3 T10/1416-D Rev 12 18 March 2003)
+*
+*  Version 0.91 (20030529)
+*      sense key specific field (bytes 15-17) decoding [Trent Piepho]
+*/
+
+#define OUTP stderr
+
+static const unsigned char scsi_command_size[8] = { 6, 10, 10, 12,
+                                                   16, 12, 10, 10 };
+
+#define COMMAND_SIZE(opcode) scsi_command_size[((opcode) >> 5) & 7]
+
+static const char unknown[] = "UNKNOWN";
+
+static const char * group_0_commands[] = {
+/* 00-03 */ "Test Unit Ready", "Rezero Unit", unknown, "Request Sense",
+/* 04-07 */ "Format Unit", "Read Block Limits", unknown, "Reasssign Blocks",
+/* 08-0d */ "Read (6)", unknown, "Write (6)", "Seek (6)", unknown, unknown,
+/* 0e-12 */ unknown, "Read Reverse", "Write Filemarks", "Space", "Inquiry",
+/* 13-16 */ "Verify", "Recover Buffered Data", "Mode Select", "Reserve",
+/* 17-1b */ "Release", "Copy", "Erase", "Mode Sense", "Start/Stop Unit",
+/* 1c-1d */ "Receive Diagnostic", "Send Diagnostic",
+/* 1e-1f */ "Prevent/Allow Medium Removal", unknown,
+};
+
+
+static const char *group_1_commands[] = {
+/* 20-23 */  unknown, unknown, unknown, "Read Format capacities",
+/* 24-28 */ "Set window", "Read Capacity",
+            unknown, unknown, "Read (10)",
+/* 29-2d */ "Read Generation", "Write (10)", "Seek (10)", "Erase",
+            "Read updated block",
+/* 2e-31 */ "Write Verify","Verify", "Search High", "Search Equal",
+/* 32-34 */ "Search Low", "Set Limits", "Prefetch or Read Position",
+/* 35-37 */ "Synchronize Cache","Lock/Unlock Cache", "Read Defect Data",
+/* 38-3c */ "Medium Scan", "Compare", "Copy Verify", "Write Buffer",
+            "Read Buffer",
+/* 3d-3f */ "Update Block", "Read Long",  "Write Long",
+};
+
+static const char *group_2_commands[] = {
+/* 40-41 */ "Change Definition", "Write Same",
+/* 42-48 */ "Read sub-channel", "Read TOC", "Read header",
+            "Play audio (10)", "Get configuration", "Play audio msf",
+            "Play audio track/index",
+/* 49-4f */ "Play track relative (10)", "Get event status notification",
+            "Pause/resume", "Log Select", "Log Sense", "Stop play/scan",
+            unknown,
+/* 50-55 */ "Xdwrite", "Xpwrite, Read disk info", "Xdread, Read track info",
+            "Reserve track", "Send OPC onfo", "Mode Select (10)",
+/* 56-5b */ "Reserve (10)", "Release (10)", "Repair track", "Read master cue",
+            "Mode Sense (10)", "Close track/session",
+/* 5c-5f */ "Read buffer capacity", "Send cue sheet", "Persistent reserve in",
+            "Persistent reserve out",
+};
+
+/* The following are 16 byte commands in group 4 */
+static const char *group_4_commands[] = {
+/* 80-84 */ "Xdwrite (16)", "Rebuild (16)", "Regenerate (16)", "Extended copy",
+            "Receive copy results",
+/* 85-89 */ "Memory Export In (16)", "Access control in", "Access control out",
+            "Read (16)", "Memory Export Out (16)",
+/* 8a-8f */ "Write (16)", unknown, "Read attributes", "Write attributes",
+            "Write and verify (16)", "Verify (16)",
+/* 90-94 */ "Pre-fetch (16)", "Synchronize cache (16)",
+            "Lock/unlock cache (16)", "Write same (16)", unknown,
+/* 95-99 */ unknown, unknown, unknown, unknown, unknown,
+/* 9a-9f */ unknown, unknown, unknown, unknown, "Service action in",
+            "Service action out",
+};
+
+/* The following are 12 byte commands in group 5 */
+static const char *group_5_commands[] = {
+/* a0-a5 */ "Report luns", "Blank", "Send event", "Maintenance (in)",
+            "Maintenance (out)", "Move medium/play audio(12)",
+/* a6-a9 */ "Exchange medium", "Move medium attached", "Read(12)",
+            "Play track relative(12)",
+/* aa-ae */ "Write(12)", unknown, "Erase(12), Get Performance",
+            "Read DVD structure", "Write and verify(12)",
+/* af-b1 */ "Verify(12)", "Search data high(12)", "Search data equal(12)",
+/* b2-b4 */ "Search data low(12)", "Set limits(12)",
+            "Read element status attached",
+/* b5-b6 */ "Request volume element address", "Send volume tag, set streaming",
+/* b7-b9 */ "Read defect data(12)", "Read element status", "Read CD msf",
+/* ba-bc */ "Redundancy group (in), Scan",
+            "Redundancy group (out), Set cd-rom speed", "Spare (in), Play cd",
+/* bd-bf */ "Spare (out), Mechanism status", "Volume set (in), Read cd",
+            "Volume set (out), Send DVD structure",
+};
+
+
+#define group(opcode) (((opcode) >> 5) & 7)
+
+#define RESERVED_GROUP  0
+#define VENDOR_GROUP    1
+
+static const char **commands[] = {
+    group_0_commands, group_1_commands, group_2_commands,
+    (const char **) RESERVED_GROUP, group_4_commands,
+    group_5_commands, (const char **) VENDOR_GROUP,
+    (const char **) VENDOR_GROUP
+};
+
+static const char reserved[] = "RESERVED";
+static const char vendor[] = "VENDOR SPECIFIC";
+
+static void print_opcode(int opcode) {
+    const char **table = commands[ group(opcode) ];
+
+    switch ((unsigned long) table) {
+    case RESERVED_GROUP:
+        fprintf(OUTP, "%s(0x%02x)", reserved, opcode);
+        break;
+    case VENDOR_GROUP:
+        fprintf(OUTP, "%s(0x%02x)", vendor, opcode);
+        break;
+    default:
+        fprintf(OUTP, "%s",table[opcode & 0x1f]);
+        break;
+    }
+}
+
+void sg_print_command (const unsigned char * command) {
+    int k, s;
+    print_opcode(command[0]);
+    fprintf(OUTP, " [");
+    for (k = 0, s = COMMAND_SIZE(command[0]); k < s; ++k)
+        fprintf(OUTP, "%02x ", command[k]);
+    fprintf(OUTP, "]\n");
+}
+
+void sg_print_status(int masked_status) 
+{
+    int scsi_status = (masked_status << 1) & 0x7e;
+
+    sg_print_scsi_status(scsi_status);
+}
+
+void sg_print_scsi_status(int scsi_status) 
+{
+    const char * ccp;
+
+    scsi_status &= 0x7e; /* sanitize as much as possible */
+    switch (scsi_status) {
+        case 0: ccp = "Good"; break;
+        case 0x2: ccp = "Check Condition"; break;
+        case 0x4: ccp = "Condition Met"; break;
+        case 0x8: ccp = "Busy"; break;
+        case 0x10: ccp = "Intermediate"; break;
+        case 0x14: ccp = "Intermediate-Condition Met"; break;
+        case 0x18: ccp = "Reservation Conflict"; break;
+        case 0x22: ccp = "Command Terminated (obsolete)"; break;
+        case 0x28: ccp = "Task set Full"; break;
+        case 0x30: ccp = "ACA Active"; break;
+        case 0x40: ccp = "Task Aborted"; break;
+        default: ccp = "Unknown status"; break;
+    }
+    fprintf(OUTP, "%s ", ccp);
+}
+
+/* In brackets is the related SCSI document (see www.t10.org) with the */
+/* peripheral device type after the colon */
+/* No programmatic use is made of these flags currently */
+#define D 0x0001  /* DIRECT ACCESS DEVICE (disk) [SBC-2: 0] */
+#define T 0x0002  /* SEQUENTIAL ACCESS DEVICE (tape) [SSC: 1] */
+#define L 0x0004  /* PRINTER DEVICE [SSC: 2] */
+#define P 0x0008  /* PROCESSOR DEVICE [SPC-2: 3] */
+#define W 0x0010  /* WRITE ONCE READ MULTIPLE DEVICE [SBC-2: 4] */
+#define R 0x0020  /* CD/DVD DEVICE [MMC-2: 5] */
+#define S 0x0040  /* SCANNER DEVICE [SCSI-2 (obsolete): 6] */
+#define O 0x0080  /* OPTICAL MEMORY DEVICE [SBC-2: 7] */
+#define M 0x0100  /* MEDIA CHANGER DEVICE [SMC-2: 8] */
+#define C 0x0200  /* COMMUNICATION DEVICE [SCSI-2 (obsolete): 9] */
+#define A 0x0400  /* ARRAY STORAGE [SCC-2: 12] */
+#define E 0x0800  /* ENCLOSURE SERVICES DEVICE [SES: 13] */
+#define B 0x1000  /* SIMPLIFIED DIRECT ACCESS DEVICE [RBC: 14] */
+#define K 0x2000  /* OPTICAL CARD READER/WRITER DEVICE [OCRW: 15] */
+
+#define SC_ALL_DEVS ( D|T|L|P|W|R|S|O|M|C|A|E|B|K )
+
+/* oft used strings are encoded using ASCII codes 0x1 to 0x1f . */
+/* This is to save space. This encoding should be UTF-8 and */
+/* UTF-16 friendly. */
+#define SC_AUDIO_PLAY_OPERATION "\x1"
+#define SC_LOGICAL_UNIT "\x2"
+#define SC_NOT_READY "\x3"
+#define SC_OPERATION "\x4"
+#define SC_IN_PROGRESS "\x5"
+#define SC_HARDWARE_IF "\x6"
+#define SC_CONTROLLER_IF "\x7"
+#define SC_DATA_CHANNEL_IF "\x8"
+#define SC_SERVO_IF "\x9"
+#define SC_SPINDLE_IF "\xa"
+#define SC_FIRMWARE_IF "\xb"
+#define SC_RECOVERED_DATA "\xc"
+#define SC_ERROR_RATE_TOO_HIGH "\xd"
+#define SC_TIMES_TOO_HIGH "\xe"
+
+
+struct error_info{
+    unsigned char code1, code2;
+    unsigned short int devices;
+    const char * text;
+};
+
+struct error_info2{
+    unsigned char code1, code2_min, code2_max;
+    unsigned short int devices;
+    const char * text;
+};
+
+static struct error_info2 additional2[] =
+{
+  {0x40,0x00,0x7f,D,"Ram failure (%x)"},
+  {0x40,0x80,0xff,D|T|L|P|W|R|S|O|M|C,"Diagnostic failure on component (%x)"},
+  {0x41,0x00,0xff,D,"Data path failure (%x)"},
+  {0x42,0x00,0xff,D,"Power-on or self-test failure (%x)"},
+  {0, 0, 0, 0, NULL}
+};
+
+static struct error_info additional[] =
+{
+  {0x00,0x00,SC_ALL_DEVS,"No additional sense information"},
+  {0x00,0x01,T,"Filemark detected"},
+  {0x00,0x02,T|S,"End-of-partition/medium detected"},
+  {0x00,0x03,T,"Setmark detected"},
+  {0x00,0x04,T|S,"Beginning-of-partition/medium detected"},
+  {0x00,0x05,T|L|S,"End-of-data detected"},
+  {0x00,0x06,SC_ALL_DEVS,"I/O process terminated"},
+  {0x00,0x11,R,SC_AUDIO_PLAY_OPERATION SC_IN_PROGRESS},
+  {0x00,0x12,R,SC_AUDIO_PLAY_OPERATION "paused"},
+  {0x00,0x13,R,SC_AUDIO_PLAY_OPERATION "successfully completed"},
+  {0x00,0x14,R,SC_AUDIO_PLAY_OPERATION "stopped due to error"},
+  {0x00,0x15,R,"No current audio status to return"},
+  {0x00,0x16,SC_ALL_DEVS,SC_OPERATION SC_IN_PROGRESS},
+  {0x00,0x17,D|T|L|W|R|S|O|M|A|E|B|K,"Cleaning requested"},
+  {0x00,0x18,T,"Erase" SC_OPERATION SC_IN_PROGRESS},
+  {0x00,0x19,T,"Locate" SC_OPERATION SC_IN_PROGRESS},
+  {0x00,0x1a,T,"Rewind" SC_OPERATION SC_IN_PROGRESS},
+  {0x00,0x1b,T,"Set capacity" SC_OPERATION SC_IN_PROGRESS},
+  {0x00,0x1c,T,"Verify" SC_OPERATION SC_IN_PROGRESS},
+  {0x01,0x00,D|W|O|B|K,"No index/sector signal"},
+  {0x02,0x00,D|W|R|O|M|B|K,"No seek complete"},
+  {0x03,0x00,D|T|L|W|S|O|B|K,"Peripheral device write fault"},
+  {0x03,0x01,T,"No write current"},
+  {0x03,0x02,T,"Excessive write errors"},
+  {0x04,0x00,SC_ALL_DEVS,SC_LOGICAL_UNIT SC_NOT_READY "cause not reportable"},
+  {0x04,0x01,SC_ALL_DEVS,SC_LOGICAL_UNIT "is" SC_IN_PROGRESS 
+                "of becoming ready"},
+  {0x04,0x02,SC_ALL_DEVS,SC_LOGICAL_UNIT SC_NOT_READY 
+                "initializing cmd. required"},
+  {0x04,0x03,SC_ALL_DEVS,SC_LOGICAL_UNIT SC_NOT_READY 
+                "manual intervention required"},
+  {0x04,0x04,D|T|L|R|O|B,SC_LOGICAL_UNIT SC_NOT_READY "format" SC_IN_PROGRESS},
+  {0x04,0x05,D|T|W|O|M|C|A|B|K,SC_LOGICAL_UNIT SC_NOT_READY 
+                "rebuild" SC_IN_PROGRESS},
+  {0x04,0x06,D|T|W|O|M|C|A|B|K,SC_LOGICAL_UNIT SC_NOT_READY 
+                "recalculation" SC_IN_PROGRESS},
+  {0x04,0x07,SC_ALL_DEVS,SC_LOGICAL_UNIT SC_NOT_READY 
+                SC_OPERATION SC_IN_PROGRESS},
+  {0x04,0x08,R,SC_LOGICAL_UNIT SC_NOT_READY "long write" SC_IN_PROGRESS},
+  {0x04,0x09,SC_ALL_DEVS,SC_LOGICAL_UNIT SC_NOT_READY "self-test" 
+                SC_IN_PROGRESS},
+  {0x04,0x0a,SC_ALL_DEVS,SC_LOGICAL_UNIT 
+                "not accessible, asymmetric access state transition"},
+  {0x04,0x0b,SC_ALL_DEVS,SC_LOGICAL_UNIT 
+                "not accessible, target port in standby state"},
+  {0x04,0x0c,SC_ALL_DEVS,SC_LOGICAL_UNIT 
+                "not accessible, target port in unavailable state"},
+  {0x04,0x10,SC_ALL_DEVS,SC_LOGICAL_UNIT SC_NOT_READY
+                "auxiliary memory not accessible"},
+  {0x05,0x00,D|T|L|W|R|S|O|M|C|A|E|B|K,SC_LOGICAL_UNIT 
+                "does not respond to selection"},
+  {0x06,0x00,D|W|R|O|M|B|K,"No reference position found"},
+  {0x07,0x00,D|T|L|W|R|S|O|M|B|K,"Multiple peripheral devices selected"},
+  {0x08,0x00,D|T|L|W|R|S|O|M|C|A|E|B|K,SC_LOGICAL_UNIT "communication failure"},
+  {0x08,0x01,D|T|L|W|R|S|O|M|C|A|E|B|K,SC_LOGICAL_UNIT 
+                "communication time-out"},
+  {0x08,0x02,D|T|L|W|R|S|O|M|C|A|E|B|K,SC_LOGICAL_UNIT 
+                "communication parity error"},
+  {0x08,0x03,D|T|R|O|M|B|K,SC_LOGICAL_UNIT 
+                "communication CRC error (Ultra-DMA/32)"},
+  {0x08,0x04,D|T|L|P|W|R|S|O|C|K,"Unreachable copy target"},
+  {0x09,0x00,D|T|W|R|O|B,"Track following error"},
+  {0x09,0x01,W|R|O|K,"Tracking servo failure"},
+  {0x09,0x02,W|R|O|K,"Focus servo failure"},
+  {0x09,0x03,W|R|O,"Spindle servo failure"},
+  {0x09,0x04,D|T|W|R|O|B,"Head select fault"},
+  {0x0A,0x00,SC_ALL_DEVS,"Error log overflow"},
+  {0x0B,0x00,SC_ALL_DEVS,"Warning"},
+  {0x0B,0x01,SC_ALL_DEVS,"Warning - specified temperature exceeded"},
+  {0x0B,0x02,SC_ALL_DEVS,"Warning - enclosure degraded"},
+  {0x0C,0x00,T|R|S,"Write error"},
+  {0x0C,0x01,K,"Write error - recovered with auto reallocation"},
+  {0x0C,0x02,D|W|O|B|K,"Write error - auto reallocation failed"},
+  {0x0C,0x03,D|W|O|B|K,"Write error - recommend reassignment"},
+  {0x0C,0x04,D|T|W|O|B,"Compression check miscompare error"},
+  {0x0C,0x05,D|T|W|O|B,"Data expansion occurred during compression"},
+  {0x0C,0x06,D|T|W|O|B,"Block not compressible"},
+  {0x0C,0x07,R,"Write error - recovery needed"},
+  {0x0C,0x08,R,"Write error - recovery failed"},
+  {0x0C,0x09,R,"Write error - loss of streaming"},
+  {0x0C,0x0A,R,"Write error - padding blocks added"},
+  {0x0C,0x0B,D|T|W|R|O|M|B,"Auxiliary memory write error"},
+  {0x0C,0x0C,SC_ALL_DEVS,"Write error - unexpected unsolicited data"},
+  {0x0C,0x0D,SC_ALL_DEVS,"Write error - not enough unsolicited data"},
+  {0x0D,0x00,D|T|L|P|W|R|S|O|C|A|K,
+                "Error detected by third party temporary initiator"},
+  {0x0D,0x01,D|T|L|P|W|R|S|O|C|A|K, "Third party device failure"},
+  {0x0D,0x02,D|T|L|P|W|R|S|O|C|A|K, "Copy target device not reachable"},
+  {0x0D,0x03,D|T|L|P|W|R|S|O|C|A|K, "Incorrect copy target device"},
+  {0x0D,0x04,D|T|L|P|W|R|S|O|C|A|K, "Copy target device underrun"},
+  {0x0D,0x05,D|T|L|P|W|R|S|O|C|A|K, "Copy target device overrun"},
+  {0x10,0x00,D|W|O|B|K,"Id CRC or ECC error"},
+  {0x11,0x00,D|T|W|R|S|O|B|K,"Unrecovered read error"},
+  {0x11,0x01,D|T|W|R|S|O|B|K,"Read retries exhausted"},
+  {0x11,0x02,D|T|W|R|S|O|B|K,"Error too long to correct"},
+  {0x11,0x03,D|T|W|S|O|B|K,"Multiple read errors"},
+  {0x11,0x04,D|W|O|B|K,"Unrecovered read error - auto reallocate failed"},
+  {0x11,0x05,W|R|O|B,"L-EC uncorrectable error"},
+  {0x11,0x06,W|R|O|B,"CIRC unrecovered error"},
+  {0x11,0x07,W|O|B,"Data re-synchronization error"},
+  {0x11,0x08,T,"Incomplete block read"},
+  {0x11,0x09,T,"No gap found"},
+  {0x11,0x0A,D|T|O|B|K,"Miscorrected error"},
+  {0x11,0x0B,D|W|O|B|K,"Unrecovered read error - recommend reassignment"},
+  {0x11,0x0C,D|W|O|B|K,"Unrecovered read error - recommend rewrite the data"},
+  {0x11,0x0D,D|T|W|R|O|B,"De-compression CRC error"},
+  {0x11,0x0E,D|T|W|R|O|B,"Cannot decompress using declared algorithm"},
+  {0x11,0x0F,R,"Error reading UPC/EAN number"},
+  {0x11,0x10,R,"Error reading ISRC number"},
+  {0x11,0x11,R,"Read error - loss of streaming"},
+  {0x11,0x12,D|T|W|R|O|M|B,"Auxiliary memory read error"},
+  {0x11,0x13,SC_ALL_DEVS,"Read error - failed retransmission request"},
+  {0x12,0x00,D|W|O|B|K,"Address mark not found for id field"},
+  {0x13,0x00,D|W|O|B|K,"Address mark not found for data field"},
+  {0x14,0x00,D|T|L|W|R|S|O|B|K,"Recorded entity not found"},
+  {0x14,0x01,D|T|W|R|O|B|K,"Record not found"},
+  {0x14,0x02,T,"Filemark or setmark not found"},
+  {0x14,0x03,T,"End-of-data not found"},
+  {0x14,0x04,T,"Block sequence error"},
+  {0x14,0x05,D|T|W|O|B|K,"Record not found - recommend reassignment"},
+  {0x14,0x06,D|T|W|O|B|K,"Record not found - data auto-reallocated"},
+  {0x14,0x07,T,"Locate" SC_OPERATION " failure"},
+  {0x15,0x00,D|T|L|W|R|S|O|M|B|K,"Random positioning error"},
+  {0x15,0x01,D|T|L|W|R|S|O|M|B|K,"Mechanical positioning error"},
+  {0x15,0x02,D|T|W|R|O|B|K,"Positioning error detected by read of medium"},
+  {0x16,0x00,D|W|O|B|K,"Data synchronization mark error"},
+  {0x16,0x01,D|W|O|B|K,"Data sync error - data rewritten"},
+  {0x16,0x02,D|W|O|B|K,"Data sync error - recommend rewrite"},
+  {0x16,0x03,D|W|O|B|K,"Data sync error - data auto-reallocated"},
+  {0x16,0x04,D|W|O|B|K,"Data sync error - recommend reassignment"},
+  {0x17,0x00,D|T|W|R|S|O|B|K,SC_RECOVERED_DATA 
+                "with no error correction applied"},
+  {0x17,0x01,D|T|W|R|S|O|B|K,SC_RECOVERED_DATA "with retries"},
+  {0x17,0x02,D|T|W|R|O|B|K,SC_RECOVERED_DATA "with positive head offset"},
+  {0x17,0x03,D|T|W|R|O|B|K,SC_RECOVERED_DATA "with negative head offset"},
+  {0x17,0x04,W|R|O|B,SC_RECOVERED_DATA "with retries and/or circ applied"},
+  {0x17,0x05,D|W|R|O|B|K,SC_RECOVERED_DATA "using previous sector id"},
+  {0x17,0x06,D|W|O|B|K,SC_RECOVERED_DATA "without ecc - data auto-reallocated"},
+  {0x17,0x07,D|W|R|O|B|K,SC_RECOVERED_DATA 
+                "without ecc - recommend reassignment"},
+  {0x17,0x08,D|W|R|O|B|K,SC_RECOVERED_DATA "without ecc - recommend rewrite"},
+  {0x17,0x09,D|W|R|O|B|K,SC_RECOVERED_DATA "without ecc - data rewritten"},
+  {0x18,0x00,D|T|W|R|O|B|K,SC_RECOVERED_DATA "with error correction applied"},
+  {0x18,0x01,D|W|R|O|B|K,SC_RECOVERED_DATA 
+                "with error corr. & retries applied"},
+  {0x18,0x02,D|W|R|O|B|K,SC_RECOVERED_DATA "- data auto-reallocated"},
+  {0x18,0x03,R,SC_RECOVERED_DATA "with CIRC"},
+  {0x18,0x04,R,SC_RECOVERED_DATA "with L-EC"},
+  {0x18,0x05,D|W|R|O|B|K,SC_RECOVERED_DATA "- recommend reassignment"},
+  {0x18,0x06,D|W|R|O|B|K,SC_RECOVERED_DATA "- recommend rewrite"},
+  {0x18,0x07,D|W|O|B|K,SC_RECOVERED_DATA "with ecc - data rewritten"},
+  {0x18,0x08,R,SC_RECOVERED_DATA "with linking"},
+  {0x19,0x00,D|O|K,"Defect list error"},
+  {0x19,0x01,D|O|K,"Defect list not available"},
+  {0x19,0x02,D|O|K,"Defect list error in primary list"},
+  {0x19,0x03,D|O|K,"Defect list error in grown list"},
+  {0x1A,0x00,SC_ALL_DEVS,"Parameter list length error"},
+  {0x1B,0x00,SC_ALL_DEVS,"Synchronous data transfer error"},
+  {0x1C,0x00,D|O|B|K,"Defect list not found"},
+  {0x1C,0x01,D|O|B|K,"Primary defect list not found"},
+  {0x1C,0x02,D|O|B|K,"Grown defect list not found"},
+  {0x1D,0x00,D|T|W|R|O|B|K,"Miscompare during verify" SC_OPERATION},
+  {0x1E,0x00,D|W|O|B|K,"Recovered id with ecc correction"},
+  {0x1F,0x00,D|O|K,"Partial defect list transfer"},
+  {0x20,0x00,SC_ALL_DEVS,"Invalid command" SC_OPERATION " code"},
+  {0x20,0x01,D|T|P|W|R|O|M|A|E|B|K,
+        "Access denied - initiator pending-enrolled"},
+  {0x20,0x02,D|T|P|W|R|O|M|A|E|B|K,"Access denied - no access rights"},
+  {0x20,0x03,D|T|P|W|R|O|M|A|E|B|K,"Access denied - no mgmt id key"},
+  {0x20,0x04,T,"Illegal command while in write capable state"},
+  {0x20,0x05,T,"Obsolete"},
+  {0x20,0x06,T,"Illegal command while in explicit address mode"},
+  {0x20,0x07,T,"Illegal command while in implicit address mode"},
+  {0x20,0x08,D|T|P|W|R|O|M|A|E|B|K,"Access denied - enrollment conflict"},
+  {0x20,0x09,D|T|P|W|R|O|M|A|E|B|K,"Access denied - invalid LU identifier"},
+  {0x20,0x0A,D|T|P|W|R|O|M|A|E|B|K,"Access denied - invalid proxy token"},
+  {0x20,0x0B,D|T|P|W|R|O|M|A|E|B|K,"Access denied - ACL LUN conflict"},
+  {0x21,0x00,D|T|W|R|O|M|B|K,"Logical block address out of range"},
+  {0x21,0x01,D|T|W|R|O|M|B|K,"Invalid element address"},
+  {0x21,0x02,R,"Invalid address for write"},
+  {0x22,0x00,D,"Illegal function (use 20 00,24 00,or 26 00)"},
+  {0x24,0x00,SC_ALL_DEVS,"Invalid field in cdb"},
+  {0x24,0x01,SC_ALL_DEVS,"CDB decryption error"},
+  {0x25,0x00,SC_ALL_DEVS,SC_LOGICAL_UNIT "not supported"},
+  {0x26,0x00,SC_ALL_DEVS,"Invalid field in parameter list"},
+  {0x26,0x01,SC_ALL_DEVS,"Parameter not supported"},
+  {0x26,0x02,SC_ALL_DEVS,"Parameter value invalid"},
+  {0x26,0x03,D|T|L|P|W|R|S|O|M|C|A|E|K,"Threshold parameters not supported"},
+  {0x26,0x04,SC_ALL_DEVS,"Invalid release of persistent reservation"},
+  {0x26,0x05,D|T|L|P|W|R|S|O|M|C|A|B|K,"Data decryption error"},
+  {0x26,0x06,D|T|L|P|W|R|S|O|C|K,"Too many target descriptors"},
+  {0x26,0x07,D|T|L|P|W|R|S|O|C|K,"Unsupported target descriptor type code"},
+  {0x26,0x08,D|T|L|P|W|R|S|O|C|K,"Too many segment descriptors"},
+  {0x26,0x09,D|T|L|P|W|R|S|O|C|K,"Unsupported segment descriptor type code"},
+  {0x26,0x0A,D|T|L|P|W|R|S|O|C|K,"Unexpected inexact segment"},
+  {0x26,0x0B,D|T|L|P|W|R|S|O|C|K,"Inline data length exceeded"},
+  {0x26,0x0C,D|T|L|P|W|R|S|O|C|K,
+                "Invalid" SC_OPERATION " for copy source or destination"},
+  {0x26,0x0D,D|T|L|P|W|R|S|O|C|K,"Copy segment granularity violation"},
+  {0x27,0x00,D|T|W|R|O|B|K,"Write protected"},
+  {0x27,0x01,D|T|W|R|O|B|K,"Hardware write protected"},
+  {0x27,0x02,D|T|W|R|O|B|K,SC_LOGICAL_UNIT "software write protected"},
+  {0x27,0x03,T|R,"Associated write protect"},
+  {0x27,0x04,T|R,"Persistent write protect"},
+  {0x27,0x05,T|R,"Permanent write protect"},
+  {0x27,0x06,R,"Conditional write protect"},
+  {0x28,0x00,SC_ALL_DEVS,"Not ready to ready change, medium may have changed"},
+  {0x28,0x01,D|T|W|R|O|M|B,"Import or export element accessed"},
+  {0x29,0x00,SC_ALL_DEVS,"Power on, reset, or bus device reset occurred"},
+  {0x29,0x01,SC_ALL_DEVS,"Power on occurred"},
+  {0x29,0x02,SC_ALL_DEVS,"Scsi bus reset occurred"},
+  {0x29,0x03,SC_ALL_DEVS,"Bus device reset function occurred"},
+  {0x29,0x04,SC_ALL_DEVS,"Device internal reset"},
+  {0x29,0x05,SC_ALL_DEVS,"Transceiver mode changed to single-ended"},
+  {0x29,0x06,SC_ALL_DEVS,"Transceiver mode changed to lvd"},
+  {0x29,0x07,SC_ALL_DEVS,"I_T nexus loss occurred"},
+  {0x2A,0x00,D|T|L|W|R|S|O|M|C|A|E|B|K,"Parameters changed"},
+  {0x2A,0x01,D|T|L|W|R|S|O|M|C|A|E|B|K,"Mode parameters changed"},
+  {0x2A,0x02,D|T|L|W|R|S|O|M|C|A|E|K,"Log parameters changed"},
+  {0x2A,0x03,D|T|L|P|W|R|S|O|M|C|A|E|K,"Reservations preempted"},
+  {0x2A,0x04,D|T|L|P|W|R|S|O|M|C|A|E,"Reservations released"},
+  {0x2A,0x05,D|T|L|P|W|R|S|O|M|C|A|E,"Registrations preempted"},
+  {0x2A,0x06,SC_ALL_DEVS,"Asymmetric access state changed"},
+  {0x2A,0x07,SC_ALL_DEVS,"Implicit asymmetric access state transition failed"},
+  {0x2B,0x00,D|T|L|P|W|R|S|O|C|K,
+                "Copy cannot execute since host cannot disconnect"},
+  {0x2C,0x00,SC_ALL_DEVS,"Command sequence error"},
+  {0x2C,0x01,S,"Too many windows specified"},
+  {0x2C,0x02,S,"Invalid combination of windows specified"},
+  {0x2C,0x03,R,"Current program area is not empty"},
+  {0x2C,0x04,R,"Current program area is empty"},
+  {0x2C,0x05,B,"Illegal power condition request"},
+  {0x2C,0x06,R,"Persistent prevent conflict"},
+  {0x2C,0x07,SC_ALL_DEVS,"Previous busy status"},
+  {0x2C,0x08,SC_ALL_DEVS,"Previous task set full status"},
+  {0x2C,0x09,D|T|L|P|W|R|S|O|M|E|B|K,"Previous reservation conflict status"},
+  {0x2D,0x00,T,"Overwrite error on update in place"},
+  {0x2F,0x00,SC_ALL_DEVS,"Commands cleared by another initiator"},
+  {0x30,0x00,D|T|W|R|O|M|B|K,"Incompatible medium installed"},
+  {0x30,0x01,D|T|W|R|O|B|K,"Cannot read medium - unknown format"},
+  {0x30,0x02,D|T|W|R|O|B|K,"Cannot read medium - incompatible format"},
+  {0x30,0x03,D|T|R|K,"Cleaning cartridge installed"},
+  {0x30,0x04,D|T|W|R|O|B|K,"Cannot write medium - unknown format"},
+  {0x30,0x05,D|T|W|R|O|B|K,"Cannot write medium - incompatible format"},
+  {0x30,0x06,D|T|W|R|O|B,"Cannot format medium - incompatible medium"},
+  {0x30,0x07,D|T|L|W|R|S|O|M|A|E|B|K,"Cleaning failure"},
+  {0x30,0x08,R,"Cannot write - application code mismatch"},
+  {0x30,0x09,R,"Current session not fixated for append"},
+  {0x30,0x10,R,"Medium not formatted"}, /* should ascq be 0xa ?? */
+  {0x31,0x00,D|T|W|R|O|B|K,"Medium format corrupted"},
+  {0x31,0x01,D|L|R|O|B,"Format command failed"},
+  {0x31,0x02,R,"Zoned formatting failed due to spare linking"},
+  {0x32,0x00,D|W|O|B|K,"No defect spare location available"},
+  {0x32,0x01,D|W|O|B|K,"Defect list update failure"},
+  {0x33,0x00,T,"Tape length error"},
+  {0x34,0x00,SC_ALL_DEVS,"Enclosure failure"},
+  {0x35,0x00,SC_ALL_DEVS,"Enclosure services failure"},
+  {0x35,0x01,SC_ALL_DEVS,"Unsupported enclosure function"},
+  {0x35,0x02,SC_ALL_DEVS,"Enclosure services unavailable"},
+  {0x35,0x03,SC_ALL_DEVS,"Enclosure services transfer failure"},
+  {0x35,0x04,SC_ALL_DEVS,"Enclosure services transfer refused"},
+  {0x36,0x00,L,"Ribbon,ink,or toner failure"},
+  {0x37,0x00,D|T|L|W|R|S|O|M|C|A|E|B|K,"Rounded parameter"},
+  {0x38,0x00,B,"Event status notification"},
+  {0x38,0x02,B,"Esn - power management class event"},
+  {0x38,0x04,B,"Esn - media class event"},
+  {0x38,0x06,B,"Esn - device busy class event"},
+  {0x39,0x00,D|T|L|W|R|S|O|M|C|A|E|K,"Saving parameters not supported"},
+  {0x3A,0x00,D|T|L|W|R|S|O|M|B|K,"Medium not present"},
+  {0x3A,0x01,D|T|W|R|O|M|B|K,"Medium not present - tray closed"},
+  {0x3A,0x02,D|T|W|R|O|M|B|K,"Medium not present - tray open"},
+  {0x3A,0x03,D|T|W|R|O|M|B,"Medium not present - loadable"},
+  {0x3A,0x04,D|T|W|R|O|M|B,
+                "Medium not present - medium auxiliary memory accessible"},
+  {0x3B,0x00,T|L,"Sequential positioning error"},
+  {0x3B,0x01,T,"Tape position error at beginning-of-medium"},
+  {0x3B,0x02,T,"Tape position error at end-of-medium"},
+  {0x3B,0x03,L,"Tape or electronic vertical forms unit " SC_NOT_READY},
+  {0x3B,0x04,L,"Slew failure"},
+  {0x3B,0x05,L,"Paper jam"},
+  {0x3B,0x06,L,"Failed to sense top-of-form"},
+  {0x3B,0x07,L,"Failed to sense bottom-of-form"},
+  {0x3B,0x08,T,"Reposition error"},
+  {0x3B,0x09,S,"Read past end of medium"},
+  {0x3B,0x0A,S,"Read past beginning of medium"},
+  {0x3B,0x0B,S,"Position past end of medium"},
+  {0x3B,0x0C,T|S,"Position past beginning of medium"},
+  {0x3B,0x0D,D|T|W|R|O|M|B|K,"Medium destination element full"},
+  {0x3B,0x0E,D|T|W|R|O|M|B|K,"Medium source element empty"},
+  {0x3B,0x0F,R,"End of medium reached"},
+  {0x3B,0x11,D|T|W|R|O|M|B|K,"Medium magazine not accessible"},
+  {0x3B,0x12,D|T|W|R|O|M|B|K,"Medium magazine removed"},
+  {0x3B,0x13,D|T|W|R|O|M|B|K,"Medium magazine inserted"},
+  {0x3B,0x14,D|T|W|R|O|M|B|K,"Medium magazine locked"},
+  {0x3B,0x15,D|T|W|R|O|M|B|K,"Medium magazine unlocked"},
+  {0x3B,0x16,R,"Mechanical positioning or changer error"},
+  {0x3D,0x00,D|T|L|P|W|R|S|O|M|C|A|E|K,"Invalid bits in identify message"},
+  {0x3E,0x00,SC_ALL_DEVS,SC_LOGICAL_UNIT "has not self-configured yet"},
+  {0x3E,0x01,SC_ALL_DEVS,SC_LOGICAL_UNIT "failure"},
+  {0x3E,0x02,SC_ALL_DEVS,"Timeout on logical unit"},
+  {0x3E,0x03,SC_ALL_DEVS,SC_LOGICAL_UNIT "failed self-test"},
+  {0x3E,0x04,SC_ALL_DEVS,SC_LOGICAL_UNIT "unable to update self-test log"},
+  {0x3F,0x00,SC_ALL_DEVS,"Target operating conditions have changed"},
+  {0x3F,0x01,SC_ALL_DEVS,"Microcode has been changed"},
+  {0x3F,0x02,D|T|L|P|W|R|S|O|M|C|B|K,"Changed operating definition"},
+  {0x3F,0x03,SC_ALL_DEVS,"Inquiry data has changed"},
+  {0x3F,0x04,D|T|W|R|O|M|C|A|E|B|K,"Component device attached"},
+  {0x3F,0x05,D|T|W|R|O|M|C|A|E|B|K,"Device identifier changed"},
+  {0x3F,0x06,D|T|W|R|O|M|C|A|E|B,"Redundancy group created or modified"},
+  {0x3F,0x07,D|T|W|R|O|M|C|A|E|B,"Redundancy group deleted"},
+  {0x3F,0x08,D|T|W|R|O|M|C|A|E|B,"Spare created or modified"},
+  {0x3F,0x09,D|T|W|R|O|M|C|A|E|B,"Spare deleted"},
+  {0x3F,0x0A,D|T|W|R|O|M|C|A|E|B|K,"Volume set created or modified"},
+  {0x3F,0x0B,D|T|W|R|O|M|C|A|E|B|K,"Volume set deleted"},
+  {0x3F,0x0C,D|T|W|R|O|M|C|A|E|B|K,"Volume set deassigned"},
+  {0x3F,0x0D,D|T|W|R|O|M|C|A|E|B|K,"Volume set reassigned"},
+  {0x3F,0x0E,D|T|L|P|W|R|S|O|M|C|A|E,"Reported luns data has changed"},
+  {0x3F,0x10,D|T|W|R|O|M|B,"Medium loadable"},
+  {0x3F,0x11,D|T|W|R|O|M|B,"Medium auxiliary memory accessible"},
+  {0x40,0x00,D,"Ram failure (should use 40 nn)"},
+  /*
+   * FIXME(eric) - need a way to represent wildcards here.
+   */
+  {0x40,0x00,SC_ALL_DEVS,"Diagnostic failure on component nn (80h-ffh)"},
+  {0x41,0x00,D,"Data path failure (should use 40 nn)"},
+  {0x42,0x00,D,"Power-on or self-test failure (should use 40 nn)"},
+  {0x43,0x00,SC_ALL_DEVS,"Message error"},
+  {0x44,0x00,SC_ALL_DEVS,"Internal target failure"},
+  {0x45,0x00,SC_ALL_DEVS,"Select or reselect failure"},
+  {0x46,0x00,D|T|L|P|W|R|S|O|M|C|B|K,"Unsuccessful soft reset"},
+  {0x47,0x00,SC_ALL_DEVS,"Scsi parity error"},
+  {0x47,0x01,SC_ALL_DEVS,"Data phase CRC error detected"},
+  {0x47,0x02,SC_ALL_DEVS,"Scsi parity error detected during st data phase"},
+  {0x47,0x03,SC_ALL_DEVS,"Information unit CRC error detected"},
+  {0x47,0x04,SC_ALL_DEVS,"Asynchronous information protection error detected"},
+  {0x47,0x05,SC_ALL_DEVS,"Protocol service CRC error"},
+  {0x48,0x00,SC_ALL_DEVS,"Initiator detected error message received"},
+  {0x49,0x00,SC_ALL_DEVS,"Invalid message error"},
+  {0x4A,0x00,SC_ALL_DEVS,"Command phase error"},
+  {0x4B,0x00,SC_ALL_DEVS,"Data phase error"},
+  {0x4C,0x00,SC_ALL_DEVS,SC_LOGICAL_UNIT "failed self-configuration"},
+  /*
+   * FIXME(eric) - need a way to represent wildcards here.
+   */
+  {0x4D,0x00,SC_ALL_DEVS,"Tagged overlapped commands (nn = queue tag)"},
+  {0x4E,0x00,SC_ALL_DEVS,"Overlapped commands attempted"},
+  {0x50,0x00,T,"Write append error"},
+  {0x50,0x01,T,"Write append position error"},
+  {0x50,0x02,T,"Position error related to timing"},
+  {0x51,0x00,T|R|O,"Erase failure"},
+  {0x52,0x00,T,"Cartridge fault"},
+  {0x53,0x00,D|T|L|W|R|S|O|M|B|K,"Media load or eject failed"},
+  {0x53,0x01,T,"Unload tape failure"},
+  {0x53,0x02,D|T|W|R|O|M|B|K,"Medium removal prevented"},
+  {0x54,0x00,P,"Scsi to host system interface failure"},
+  {0x55,0x00,P,"System resource failure"},
+  {0x55,0x01,D|O|B|K,"System buffer full"},
+  {0x55,0x02,D|T|L|P|W|R|S|O|M|A|E|K,"Insufficient reservation resources"},
+  {0x55,0x03,D|T|L|P|W|R|S|O|M|C|A|E,"Insufficient resources"},
+  {0x55,0x04,D|T|L|P|W|R|S|O|M|A|E,"Insufficient registration resources"},
+  {0x55,0x05,D|T|P|W|R|O|M|A|E|B|K,"Insufficient access control resources"},
+  {0x55,0x06,D|T|W|R|O|M|B,"Auxiliary memory out of space"},
+  {0x57,0x00,R,"Unable to recover table-of-contents"},
+  {0x58,0x00,O,"Generation does not exist"},
+  {0x59,0x00,O,"Updated block read"},
+  {0x5A,0x00,D|T|L|P|W|R|S|O|M|B|K,"Operator request or state change input"},
+  {0x5A,0x01,D|T|W|R|O|M|B|K,"Operator medium removal request"},
+  {0x5A,0x02,D|T|W|R|O|A|B|K,"Operator selected write protect"},
+  {0x5A,0x03,D|T|W|R|O|A|B|K,"Operator selected write permit"},
+  {0x5B,0x00,D|T|L|P|W|R|S|O|M|K,"Log exception"},
+  {0x5B,0x01,D|T|L|P|W|R|S|O|M|K,"Threshold condition met"},
+  {0x5B,0x02,D|T|L|P|W|R|S|O|M|K,"Log counter at maximum"},
+  {0x5B,0x03,D|T|L|P|W|R|S|O|M|K,"Log list codes exhausted"},
+  {0x5C,0x00,D|O,"Rpl status change"},
+  {0x5C,0x01,D|O,"Spindles synchronized"},
+  {0x5C,0x02,D|O,"Spindles not synchronized"},
+  {0x5D,0x00,SC_ALL_DEVS,"Failure prediction threshold exceeded"},
+  {0x5D,0x01,R|B,"Media failure prediction threshold exceeded"},
+  {0x5D,0x02,R,SC_LOGICAL_UNIT "failure prediction threshold exceeded"},
+  {0x5D,0x03,R,"spare area exhaustion prediction threshold exceeded"},
+        /* large series of "impending failure" messages */
+  {0x5D,0x10,D|B,SC_HARDWARE_IF "general hard drive failure"},
+  {0x5D,0x11,D|B,SC_HARDWARE_IF "drive" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x12,D|B,SC_HARDWARE_IF "data" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x13,D|B,SC_HARDWARE_IF "seek" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x14,D|B,SC_HARDWARE_IF "too many block reassigns"},
+  {0x5D,0x15,D|B,SC_HARDWARE_IF "access" SC_TIMES_TOO_HIGH },
+  {0x5D,0x16,D|B,SC_HARDWARE_IF "start unit" SC_TIMES_TOO_HIGH },
+  {0x5D,0x17,D|B,SC_HARDWARE_IF "channel parametrics"},
+  {0x5D,0x18,D|B,SC_HARDWARE_IF "controller detected"},
+  {0x5D,0x19,D|B,SC_HARDWARE_IF "throughput performance"},
+  {0x5D,0x1A,D|B,SC_HARDWARE_IF "seek time performance"},
+  {0x5D,0x1B,D|B,SC_HARDWARE_IF "spin-up retry count"},
+  {0x5D,0x1C,D|B,SC_HARDWARE_IF "drive calibration retry count"},
+  {0x5D,0x20,D|B,SC_CONTROLLER_IF "general hard drive failure"},
+  {0x5D,0x21,D|B,SC_CONTROLLER_IF "drive" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x22,D|B,SC_CONTROLLER_IF "data" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x23,D|B,SC_CONTROLLER_IF "seek" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x24,D|B,SC_CONTROLLER_IF "too many block reassigns"},
+  {0x5D,0x25,D|B,SC_CONTROLLER_IF "access" SC_TIMES_TOO_HIGH },
+  {0x5D,0x26,D|B,SC_CONTROLLER_IF "start unit" SC_TIMES_TOO_HIGH },
+  {0x5D,0x27,D|B,SC_CONTROLLER_IF "channel parametrics"},
+  {0x5D,0x28,D|B,SC_CONTROLLER_IF "controller detected"},
+  {0x5D,0x29,D|B,SC_CONTROLLER_IF "throughput performance"},
+  {0x5D,0x2A,D|B,SC_CONTROLLER_IF "seek time performance"},
+  {0x5D,0x2B,D|B,SC_CONTROLLER_IF "spin-up retry count"},
+  {0x5D,0x2C,D|B,SC_CONTROLLER_IF "drive calibration retry count"},
+  {0x5D,0x30,D|B,SC_DATA_CHANNEL_IF "general hard drive failure"},
+  {0x5D,0x31,D|B,SC_DATA_CHANNEL_IF "drive" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x32,D|B,SC_DATA_CHANNEL_IF "data" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x33,D|B,SC_DATA_CHANNEL_IF "seek" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x34,D|B,SC_DATA_CHANNEL_IF "too many block reassigns"},
+  {0x5D,0x35,D|B,SC_DATA_CHANNEL_IF "access" SC_TIMES_TOO_HIGH },
+  {0x5D,0x36,D|B,SC_DATA_CHANNEL_IF "start unit" SC_TIMES_TOO_HIGH },
+  {0x5D,0x37,D|B,SC_DATA_CHANNEL_IF "channel parametrics"},
+  {0x5D,0x38,D|B,SC_DATA_CHANNEL_IF "controller detected"},
+  {0x5D,0x39,D|B,SC_DATA_CHANNEL_IF "throughput performance"},
+  {0x5D,0x3A,D|B,SC_DATA_CHANNEL_IF "seek time performance"},
+  {0x5D,0x3B,D|B,SC_DATA_CHANNEL_IF "spin-up retry count"},
+  {0x5D,0x3C,D|B,SC_DATA_CHANNEL_IF "drive calibration retry count"},
+  {0x5D,0x40,D|B,SC_SERVO_IF "general hard drive failure"},
+  {0x5D,0x41,D|B,SC_SERVO_IF "drive" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x42,D|B,SC_SERVO_IF "data" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x43,D|B,SC_SERVO_IF "seek" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x44,D|B,SC_SERVO_IF "too many block reassigns"},
+  {0x5D,0x45,D|B,SC_SERVO_IF "access" SC_TIMES_TOO_HIGH },
+  {0x5D,0x46,D|B,SC_SERVO_IF "start unit" SC_TIMES_TOO_HIGH },
+  {0x5D,0x47,D|B,SC_SERVO_IF "channel parametrics"},
+  {0x5D,0x48,D|B,SC_SERVO_IF "controller detected"},
+  {0x5D,0x49,D|B,SC_SERVO_IF "throughput performance"},
+  {0x5D,0x4A,D|B,SC_SERVO_IF "seek time performance"},
+  {0x5D,0x4B,D|B,SC_SERVO_IF "spin-up retry count"},
+  {0x5D,0x4C,D|B,SC_SERVO_IF "drive calibration retry count"},
+  {0x5D,0x50,D|B,SC_SPINDLE_IF "general hard drive failure"},
+  {0x5D,0x51,D|B,SC_SPINDLE_IF "drive" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x52,D|B,SC_SPINDLE_IF "data" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x53,D|B,SC_SPINDLE_IF "seek" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x54,D|B,SC_SPINDLE_IF "too many block reassigns"},
+  {0x5D,0x55,D|B,SC_SPINDLE_IF "access" SC_TIMES_TOO_HIGH },
+  {0x5D,0x56,D|B,SC_SPINDLE_IF "start unit" SC_TIMES_TOO_HIGH },
+  {0x5D,0x57,D|B,SC_SPINDLE_IF "channel parametrics"},
+  {0x5D,0x58,D|B,SC_SPINDLE_IF "controller detected"},
+  {0x5D,0x59,D|B,SC_SPINDLE_IF "throughput performance"},
+  {0x5D,0x5A,D|B,SC_SPINDLE_IF "seek time performance"},
+  {0x5D,0x5B,D|B,SC_SPINDLE_IF "spin-up retry count"},
+  {0x5D,0x5C,D|B,SC_SPINDLE_IF "drive calibration retry count"},
+  {0x5D,0x60,D|B,SC_FIRMWARE_IF "general hard drive failure"},
+  {0x5D,0x61,D|B,SC_FIRMWARE_IF "drive" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x62,D|B,SC_FIRMWARE_IF "data" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x63,D|B,SC_FIRMWARE_IF "seek" SC_ERROR_RATE_TOO_HIGH },
+  {0x5D,0x64,D|B,SC_FIRMWARE_IF "too many block reassigns"},
+  {0x5D,0x65,D|B,SC_FIRMWARE_IF "access" SC_TIMES_TOO_HIGH },
+  {0x5D,0x66,D|B,SC_FIRMWARE_IF "start unit" SC_TIMES_TOO_HIGH },
+  {0x5D,0x67,D|B,SC_FIRMWARE_IF "channel parametrics"},
+  {0x5D,0x68,D|B,SC_FIRMWARE_IF "controller detected"},
+  {0x5D,0x69,D|B,SC_FIRMWARE_IF "throughput performance"},
+  {0x5D,0x6A,D|B,SC_FIRMWARE_IF "seek time performance"},
+  {0x5D,0x6B,D|B,SC_FIRMWARE_IF "spin-up retry count"},
+  {0x5D,0x6C,D|B,SC_FIRMWARE_IF "drive calibration retry count"},
+  {0x5D,0xFF,SC_ALL_DEVS,"Failure prediction threshold exceeded (false)"},
+  {0x5E,0x00,D|T|L|P|W|R|S|O|C|A|K,"Low power condition on"},
+  {0x5E,0x01,D|T|L|P|W|R|S|O|C|A|K,"Idle condition activated by timer"},
+  {0x5E,0x02,D|T|L|P|W|R|S|O|C|A|K,"Standby condition activated by timer"},
+  {0x5E,0x03,D|T|L|P|W|R|S|O|C|A|K,"Idle condition activated by command"},
+  {0x5E,0x04,D|T|L|P|W|R|S|O|C|A|K,"Standby condition activated by command"},
+  {0x5E,0x41,B,"Power state change to active"},
+  {0x5E,0x42,B,"Power state change to idle"},
+  {0x5E,0x43,B,"Power state change to standby"},
+  {0x5E,0x45,B,"Power state change to sleep"},
+  {0x5E,0x47,B|K,"Power state change to device control"},
+  {0x60,0x00,S,"Lamp failure"},
+  {0x61,0x00,S,"Video acquisition error"},
+  {0x61,0x01,S,"Unable to acquire video"},
+  {0x61,0x02,S,"Out of focus"},
+  {0x62,0x00,S,"Scan head positioning error"},
+  {0x63,0x00,R,"End of user area encountered on this track"},
+  {0x63,0x01,R,"Packet does not fit in available space"},
+  {0x64,0x00,R,"Illegal mode for this track"},
+  {0x64,0x01,R,"Invalid packet size"},
+  {0x65,0x00,SC_ALL_DEVS,"Voltage fault"},
+  {0x66,0x00,S,"Automatic document feeder cover up"},
+  {0x66,0x01,S,"Automatic document feeder lift up"},
+  {0x66,0x02,S,"Document jam in automatic document feeder"},
+  {0x66,0x03,S,"Document miss feed automatic in document feeder"},
+  {0x67,0x00,A,"Configuration failure"},
+  {0x67,0x01,A,"Configuration of incapable logical units failed"},
+  {0x67,0x02,A,"Add logical unit failed"},
+  {0x67,0x03,A,"Modification of logical unit failed"},
+  {0x67,0x04,A,"Exchange of logical unit failed"},
+  {0x67,0x05,A,"Remove of logical unit failed"},
+  {0x67,0x06,A,"Attachment of logical unit failed"},
+  {0x67,0x07,A,"Creation of logical unit failed"},
+  {0x67,0x08,A,"Assign failure occurred"},
+  {0x67,0x09,A,"Multiply assigned logical unit"},
+  {0x67,0x0A,SC_ALL_DEVS,"Set target port groups command failed"},
+  {0x68,0x00,A,SC_LOGICAL_UNIT "not configured"},
+  {0x69,0x00,A,"Data loss on logical unit"},
+  {0x69,0x01,A,"Multiple logical unit failures"},
+  {0x69,0x02,A,"Parity/data mismatch"},
+  {0x6A,0x00,A,"Informational,refer to log"},
+  {0x6B,0x00,A,"State change has occurred"},
+  {0x6B,0x01,A,"Redundancy level got better"},
+  {0x6B,0x02,A,"Redundancy level got worse"},
+  {0x6C,0x00,A,"Rebuild failure occurred"},
+  {0x6D,0x00,A,"Recalculate failure occurred"},
+  {0x6E,0x00,A,"Command to logical unit failed"},
+  {0x6F,0x00,R,"Copy protection key exchange failure - authentication failure"},
+  {0x6F,0x01,R,"Copy protection key exchange failure - key not present"},
+  {0x6F,0x02,R,"Copy protection key exchange failure - key not established"},
+  {0x6F,0x03,R,"Read of scrambled sector without authentication"},
+  {0x6F,0x04,R,"Media region code is mismatched to logical unit region"},
+  {0x6F,0x05,R,"Drive region must be permanent/region reset count error"},
+  /*
+   * FIXME(eric) - need a way to represent wildcards here.
+   */
+  {0x70,0x00,T,"Decompression exception short algorithm id of nn"},
+  {0x71,0x00,T,"Decompression exception long algorithm id"},
+  {0x72,0x00,R,"Session fixation error"},
+  {0x72,0x01,R,"Session fixation error writing lead-in"},
+  {0x72,0x02,R,"Session fixation error writing lead-out"},
+  {0x72,0x03,R,"Session fixation error - incomplete track in session"},
+  {0x72,0x04,R,"Empty or partially written reserved track"},
+  {0x72,0x05,R,"No more track reservations allowed"},
+  {0x73,0x00,R,"Cd control error"},
+  {0x73,0x01,R,"Power calibration area almost full"},
+  {0x73,0x02,R,"Power calibration area is full"},
+  {0x73,0x03,R,"Power calibration area error"},
+  {0x73,0x04,R,"Program memory area update failure"},
+  {0x73,0x05,R,"Program memory area is full"},
+  {0x73,0x06,R,"RMA/PMA is full"},
+  {0, 0, 0, NULL}
+};
+
+static const char * sc_oft_used[0x1f] = {
+        "umulig",                       /* index 0x0 should be impossible */
+        "Audio play operation ",
+        "Logical unit ",
+        "not ready, ",
+        " operation",
+        " in progress ",
+        "Hardware impending failure ",
+        "Controller impending failure ",
+        "Data channel impending failure ",      /* index 0x8 */
+        "Servo impending failure ",
+        "Spindle impending failure ",
+        "Firmware impending failure ",
+        "Recovered data ",
+        " error rate too high",
+        " times too high",
+};
+
+static const char *snstext[] = {
+    "No Sense",                 /* There is no sense information */
+    "Recovered Error",          /* The last command completed successfully
+                                   but used error correction */
+    "Not Ready",                /* The addressed target is not ready */
+    "Medium Error",             /* Data error detected on the medium */
+    "Hardware Error",           /* Controller or device failure */
+    "Illegal Request",
+    "Unit Attention",           /* Removable medium was changed, or
+                                   the target has been reset */
+    "Data Protect",             /* Access to the data is blocked */
+    "Blank Check",              /* Reached unexpected written or unwritten
+                                   region of the medium */
+    "Key=9",                    /* Vendor specific */
+    "Copy Aborted",             /* COPY or COMPARE was aborted */
+    "Aborted Command",          /* The target aborted the command */
+    "Equal",                    /* SEARCH DATA found data equal (obsolete) */
+    "Volume Overflow",          /* Medium full with still data to be written */
+    "Miscompare",               /* Source data and data on the medium
+                                   do not agree */
+    "Key=15"                    /* Reserved */
+};
+
+static
+void sg_print_asc_ascq(unsigned char asc, unsigned char ascq)
+{
+    int k, j;
+    char obuff[256];
+    const char * ccp;
+    const char * oup;
+    char c;
+    int found = 0;
+
+    for (k=0; additional[k].text; k++) {
+        if (additional[k].code1 == asc &&
+            additional[k].code2 == ascq) {
+            found = 1;
+            ccp = additional[k].text;
+            for (j = 0; *ccp && (j < sizeof(obuff)); ++ccp) {
+                c = *ccp;
+                if ((c < 0x20) && (c > 0)) {
+                    oup = sc_oft_used[(int)c];
+                    if (oup) {
+                        strcpy(obuff + j, oup);
+                        j += strlen(oup);
+                    }
+                    else {
+                        strcpy(obuff + j, "???");
+                        j += 3;
+                    }
+                }
+                else
+                    obuff[j++] = c;
+            }
+            if (j < sizeof(obuff))
+                obuff[j] = '\0';
+            else
+                obuff[sizeof(obuff) - 1] = '\0';
+            fprintf(OUTP, "Additional sense: %s\n", obuff);
+        }
+    }
+    if (found)
+        return;
+
+    for(k=0; additional2[k].text; k++) {
+        if ((additional2[k].code1 == asc) &&
+            (ascq >= additional2[k].code2_min)  &&
+            (ascq <= additional2[k].code2_max)) {
+            found = 1;
+            fprintf(OUTP, "Additional sense: ");
+            fprintf(OUTP, additional2[k].text, ascq);
+            fprintf(OUTP, "\n");
+        }
+    }
+    if (! found)
+        fprintf(OUTP, "ASC=%2x ASCQ=%2x\n", asc, ascq);
+}
+
+/* Print sense information */
+void sg_print_sense(const char * leadin, const unsigned char * sense_buffer,
+                    int sb_len)
+{
+    int k, s;
+    int sense_key, sense_class, valid, code;
+    int descriptor_format = 0;
+    const char * error = NULL;
+
+    if (sb_len < 1) {
+            fprintf(OUTP, "sense buffer empty\n");
+            return;
+    }
+    sense_class = (sense_buffer[0] >> 4) & 0x07;
+    code = sense_buffer[0] & 0xf;
+    valid = sense_buffer[0] & 0x80;
+    if (leadin)
+        fprintf(OUTP, "%s: ", leadin);
+
+    if (sense_class == 7) {     /* extended sense data */
+        s = sense_buffer[7] + 8;
+        if(s > sb_len)  /* device has more available which we ignore */
+            s = sb_len;
+
+        switch (code) {
+        case 0x0:
+            error = "Current";  /* error concerns current command */
+            break;
+        case 0x1:
+            error = "Deferred"; /* error concerns some earlier command */
+                /* e.g., an earlier write to disk cache succeeded, but
+                   now the disk discovers that it cannot write the data */
+            break;
+        case 0x2:
+            descriptor_format = 1;
+            error = "Descriptor current";
+            /* new descriptor sense format */
+            break;
+        case 0x3:
+            descriptor_format = 1;
+            error = "Descriptor deferred";
+            /* new descriptor sense format (deferred report) */
+            break;
+        default:
+            error = "Invalid";
+        }
+        sense_key = sense_buffer[ descriptor_format ? 1 : 2 ] & 0xf;
+        fprintf(OUTP, "%s, Sense key: %s\n", error, snstext[sense_key]);
+
+        if (descriptor_format)
+            sg_print_asc_ascq(sense_buffer[2], sense_buffer[3]);
+        else {
+            if (!valid)
+                fprintf(OUTP, "[valid=0] ");
+            fprintf(OUTP, "Info fld=0x%x, ", (int)((sense_buffer[3] << 24) |
+                    (sense_buffer[4] << 16) | (sense_buffer[5] << 8) |
+                    sense_buffer[6]));
+
+            if (sense_buffer[2] & 0x80)
+               fprintf(OUTP, "FMK "); /* current command has read a filemark */
+            if (sense_buffer[2] & 0x40)
+               fprintf(OUTP, "EOM "); /* end-of-medium condition exists */
+            if (sense_buffer[2] & 0x20)
+               fprintf(OUTP, "ILI "); /* incorrect block length requested */
+
+            if (s > 13) {
+                if (sense_buffer[12] || sense_buffer[13])
+                    sg_print_asc_ascq(sense_buffer[12], sense_buffer[13]);
+            }
+            if (sense_key == 5 && s >= 18 && (sense_buffer[15]&0x80)) {
+                fprintf(OUTP, "Sense Key Specific: Error in %s byte %d",
+                        (sense_buffer[15]&0x40)?"Command":"Data",
+                        (sense_buffer[16]<<8)|sense_buffer[17]);
+                if(sense_buffer[15]&0x08) {
+                    fprintf(OUTP, " bit %d\n", sense_buffer[15]&0x07);
+                } else {
+                    fprintf(OUTP, "\n");
+                }
+            }
+        }
+
+    } else {    /* non-extended sense data */
+
+         /*
+          * Standard says:
+          *    sense_buffer[0] & 0200 : address valid
+          *    sense_buffer[0] & 0177 : vendor-specific error code
+          *    sense_buffer[1] & 0340 : vendor-specific
+          *    sense_buffer[1..3] : 21-bit logical block address
+          */
+
+        if (sb_len < 4) {
+            fprintf(OUTP, "sense buffer too short (4 byte minimum)\n");
+            return;
+        }
+        if (leadin)
+            fprintf(OUTP, "%s: ", leadin);
+        if (sense_buffer[0] < 15)
+            fprintf(OUTP, 
+                    "old sense: key %s\n", snstext[sense_buffer[0] & 0x0f]);
+        else
+            fprintf(OUTP, "sns = %2x %2x\n", sense_buffer[0], sense_buffer[2]);
+
+        fprintf(OUTP, "Non-extended sense class %d code 0x%0x ", 
+                sense_class, code);
+        s = 4;
+    }
+
+    fprintf(OUTP, "Raw sense data (in hex):\n  ");
+    for (k = 0; k < s; ++k) {
+        if ((k > 0) && (0 == (k % 24)))
+            fprintf(OUTP, "\n  ");
+        fprintf(OUTP, "%02x ", sense_buffer[k]);
+    }
+    fprintf(OUTP, "\n");
+}
+
+static const char * hostbyte_table[]={
+"DID_OK", "DID_NO_CONNECT", "DID_BUS_BUSY", "DID_TIME_OUT", "DID_BAD_TARGET",
+"DID_ABORT", "DID_PARITY", "DID_ERROR", "DID_RESET", "DID_BAD_INTR",
+"DID_PASSTHROUGH", "DID_SOFT_ERROR", NULL};
+
+void sg_print_host_status(int host_status)
+{   static int maxcode=0;
+    int i;
+
+    if(! maxcode) {
+        for(i = 0; hostbyte_table[i]; i++) ;
+        maxcode = i-1;
+    }
+    fprintf(OUTP, "Host_status=0x%02x", host_status);
+    if(host_status > maxcode) {
+        fprintf(OUTP, "is invalid ");
+        return;
+    }
+    fprintf(OUTP, "(%s) ",hostbyte_table[host_status]);
+}
+
+static const char * driverbyte_table[]={
+"DRIVER_OK", "DRIVER_BUSY", "DRIVER_SOFT",  "DRIVER_MEDIA", "DRIVER_ERROR",
+"DRIVER_INVALID", "DRIVER_TIMEOUT", "DRIVER_HARD", "DRIVER_SENSE", NULL};
+
+static const char * driversuggest_table[]={"SUGGEST_OK",
+"SUGGEST_RETRY", "SUGGEST_ABORT", "SUGGEST_REMAP", "SUGGEST_DIE",
+unknown,unknown,unknown, "SUGGEST_SENSE",NULL};
+
+
+void sg_print_driver_status(int driver_status)
+{
+    static int driver_max =0 , suggest_max=0;
+    int i;
+    int dr = driver_status & SG_ERR_DRIVER_MASK;
+    int su = (driver_status & SG_ERR_SUGGEST_MASK) >> 4;
+
+    if(! driver_max) {
+        for(i = 0; driverbyte_table[i]; i++) ;
+        driver_max = i;
+        for(i = 0; driversuggest_table[i]; i++) ;
+        suggest_max = i;
+    }
+    fprintf(OUTP, "Driver_status=0x%02x",driver_status);
+    fprintf(OUTP, " (%s,%s) ",
+            dr < driver_max  ? driverbyte_table[dr]:"invalid",
+            su < suggest_max ? driversuggest_table[su]:"invalid");
+}
+
+static int sg_sense_print(const char * leadin, int scsi_status,
+                          int host_status, int driver_status,
+                          const unsigned char * sense_buffer, int sb_len)
+{
+    int done_leadin = 0;
+    int done_sense = 0;
+
+    scsi_status &= 0x7e; /*sanity */
+    if ((0 == scsi_status) && (0 == host_status) &&
+        (0 == driver_status))
+        return 1;       /* No problems */
+    if (0 != scsi_status) {
+        if (leadin)
+            fprintf(OUTP, "%s: ", leadin);
+        done_leadin = 1;
+        fprintf(OUTP, "scsi status: ");
+        sg_print_scsi_status(scsi_status);
+        fprintf(OUTP, "\n");
+        if (sense_buffer && ((scsi_status == SCSI_CHECK_CONDITION) ||
+                             (scsi_status == SCSI_COMMAND_TERMINATED))) {
+            sg_print_sense(0, sense_buffer, sb_len);
+            done_sense = 1;
+        }
+    }
+    if (0 != host_status) {
+        if (leadin && (! done_leadin))
+            fprintf(OUTP, "%s: ", leadin);
+        if (done_leadin)
+            fprintf(OUTP, "plus...: ");
+        else
+            done_leadin = 1;
+        sg_print_host_status(host_status);
+        fprintf(OUTP, "\n");
+    }
+    if (0 != driver_status) {
+        if (leadin && (! done_leadin))
+            fprintf(OUTP, "%s: ", leadin);
+        if (done_leadin)
+            fprintf(OUTP, "plus...: ");
+        else
+            done_leadin = 1;
+        sg_print_driver_status(driver_status);
+        fprintf(OUTP, "\n");
+        if (sense_buffer && (! done_sense) &&
+            (SG_ERR_DRIVER_SENSE == (0xf & driver_status)))
+            sg_print_sense(0, sense_buffer, sb_len);
+    }
+    return 0;
+}
+
+#ifdef SG_IO
+int sg_chk_n_print3(const char * leadin, struct sg_io_hdr * hp)
+{
+    return sg_sense_print(leadin, hp->status, hp->host_status,
+                          hp->driver_status, hp->sbp, hp->sb_len_wr);
+}
+#endif
+
+int sg_chk_n_print(const char * leadin, int masked_status,
+                   int host_status, int driver_status,
+                   const unsigned char * sense_buffer, int sb_len)
+{
+    int scsi_status = (masked_status << 1) & 0x7e;
+
+    return sg_sense_print(leadin, scsi_status, host_status, driver_status,
+                          sense_buffer, sb_len);
+}
+
+#ifdef SG_IO
+int sg_err_category3(struct sg_io_hdr * hp)
+{
+    return sg_err_category_new(hp->status, hp->host_status,
+                               hp->driver_status, hp->sbp, hp->sb_len_wr);
+}
+#endif
+
+int sg_err_category(int masked_status, int host_status,
+                    int driver_status, const unsigned char * sense_buffer,
+                    int sb_len)
+{
+    int scsi_status = (masked_status << 1) & 0x7e;
+
+    return sg_err_category_new(scsi_status, host_status, driver_status,
+                               sense_buffer, sb_len);
+}
+
+int sg_err_category_new(int scsi_status, int host_status, int driver_status, 
+                        const unsigned char * sense_buffer, int sb_len)
+{
+    scsi_status &= 0x7e;
+    if ((0 == scsi_status) && (0 == host_status) &&
+        (0 == driver_status))
+        return SG_ERR_CAT_CLEAN;
+    if ((SCSI_CHECK_CONDITION == scsi_status) ||
+        (SCSI_COMMAND_TERMINATED == scsi_status) ||
+        (SG_ERR_DRIVER_SENSE == (0xf & driver_status))) {
+        if (sense_buffer && (sb_len > 2)) {
+            int sense_key;
+            unsigned char asc;
+
+            if (sense_buffer[0] & 0x2) {
+                sense_key = sense_buffer[1] & 0xf;
+                asc = sense_buffer[2];
+            }
+            else {
+                sense_key = sense_buffer[2] & 0xf;
+                asc = (sb_len > 12) ? sense_buffer[12] : 0;
+            }
+
+            if(RECOVERED_ERROR == sense_key)
+                return SG_ERR_CAT_RECOVERED;
+            else if (UNIT_ATTENTION == sense_key) {
+                if (0x28 == asc)
+                    return SG_ERR_CAT_MEDIA_CHANGED;
+                if (0x29 == asc)
+                    return SG_ERR_CAT_RESET;
+            }
+        }
+        return SG_ERR_CAT_SENSE;
+    }
+    if (0 != host_status) {
+        if ((SG_ERR_DID_NO_CONNECT == host_status) ||
+            (SG_ERR_DID_BUS_BUSY == host_status) ||
+            (SG_ERR_DID_TIME_OUT == host_status))
+            return SG_ERR_CAT_TIMEOUT;
+    }
+    if (0 != driver_status) {
+        if (SG_ERR_DRIVER_TIMEOUT == driver_status)
+            return SG_ERR_CAT_TIMEOUT;
+    }
+    return SG_ERR_CAT_OTHER;
+}
+
+int sg_get_command_size(unsigned char opcode)
+{
+    return COMMAND_SIZE(opcode);
+}
+
+void sg_get_command_name(unsigned char opcode, int buff_len, char * buff)
+{
+    const char **table = commands[ group(opcode) ];
+
+    if ((NULL == buff) || (buff_len < 1))
+        return;
+
+    switch ((unsigned long) table) {
+    case RESERVED_GROUP:
+        strncpy(buff, reserved, buff_len);
+        break;
+    case VENDOR_GROUP:
+        strncpy(buff, vendor, buff_len);
+        break;
+    default:
+        strncpy(buff, table[opcode & 0x1f], buff_len);
+        break;
+    }
+}
diff --git a/extras/multipath/sg_err.h b/extras/multipath/sg_err.h
new file mode 100644
index 0000000000..ef57b5ce38
--- /dev/null
+++ b/extras/multipath/sg_err.h
@@ -0,0 +1,162 @@
+#ifndef SG_ERR_H
+#define SG_ERR_H
+
+/* Feel free to copy and modify this GPL-ed code into your applications. */
+
+/* Version 0.90 (20030519) 
+*/
+
+
+/* Some of the following error/status codes are exchanged between the
+   various layers of the SCSI sub-system in Linux and should never
+   reach the user. They are placed here for completeness. What appears
+   here is copied from drivers/scsi/scsi.h which is not visible in
+   the user space. */
+
+#ifndef SCSI_CHECK_CONDITION
+/* Following are the "true" SCSI status codes. Linux has traditionally
+   used a 1 bit right and masked version of these. So now CHECK_CONDITION
+   and friends (in <scsi/scsi.h>) are deprecated. */
+#define SCSI_CHECK_CONDITION 0x2
+#define SCSI_CONDITION_MET 0x4
+#define SCSI_BUSY 0x8
+#define SCSI_IMMEDIATE 0x10
+#define SCSI_IMMEDIATE_CONDITION_MET 0x14
+#define SCSI_RESERVATION_CONFLICT 0x18
+#define SCSI_COMMAND_TERMINATED 0x22
+#define SCSI_TASK_SET_FULL 0x28
+#define SCSI_ACA_ACTIVE 0x30
+#define SCSI_TASK_ABORTED 0x40
+#endif
+
+/* The following are 'host_status' codes */
+#ifndef DID_OK
+#define DID_OK 0x00
+#endif
+#ifndef DID_NO_CONNECT
+#define DID_NO_CONNECT 0x01     /* Unable to connect before timeout */
+#define DID_BUS_BUSY 0x02       /* Bus remain busy until timeout */
+#define DID_TIME_OUT 0x03       /* Timed out for some other reason */
+#define DID_BAD_TARGET 0x04     /* Bad target (id?) */
+#define DID_ABORT 0x05          /* Told to abort for some other reason */
+#define DID_PARITY 0x06         /* Parity error (on SCSI bus) */
+#define DID_ERROR 0x07          /* Internal error */
+#define DID_RESET 0x08          /* Reset by somebody */
+#define DID_BAD_INTR 0x09       /* Received an unexpected interrupt */
+#define DID_PASSTHROUGH 0x0a    /* Force command past mid-level */
+#define DID_SOFT_ERROR 0x0b     /* The low-level driver wants a retry */
+#endif
+
+/* These defines are to isolate applictaions from kernel define changes */
+#define SG_ERR_DID_OK           DID_OK
+#define SG_ERR_DID_NO_CONNECT   DID_NO_CONNECT
+#define SG_ERR_DID_BUS_BUSY     DID_BUS_BUSY
+#define SG_ERR_DID_TIME_OUT     DID_TIME_OUT
+#define SG_ERR_DID_BAD_TARGET   DID_BAD_TARGET
+#define SG_ERR_DID_ABORT        DID_ABORT
+#define SG_ERR_DID_PARITY       DID_PARITY
+#define SG_ERR_DID_ERROR        DID_ERROR
+#define SG_ERR_DID_RESET        DID_RESET
+#define SG_ERR_DID_BAD_INTR     DID_BAD_INTR
+#define SG_ERR_DID_PASSTHROUGH  DID_PASSTHROUGH
+#define SG_ERR_DID_SOFT_ERROR   DID_SOFT_ERROR
+
+/* The following are 'driver_status' codes */
+#ifndef DRIVER_OK
+#define DRIVER_OK 0x00
+#endif
+#ifndef DRIVER_BUSY
+#define DRIVER_BUSY 0x01
+#define DRIVER_SOFT 0x02
+#define DRIVER_MEDIA 0x03
+#define DRIVER_ERROR 0x04
+#define DRIVER_INVALID 0x05
+#define DRIVER_TIMEOUT 0x06
+#define DRIVER_HARD 0x07
+#define DRIVER_SENSE 0x08       /* Sense_buffer has been set */
+
+/* Following "suggests" are "or-ed" with one of previous 8 entries */
+#define SUGGEST_RETRY 0x10
+#define SUGGEST_ABORT 0x20
+#define SUGGEST_REMAP 0x30
+#define SUGGEST_DIE 0x40
+#define SUGGEST_SENSE 0x80
+#define SUGGEST_IS_OK 0xff
+#endif
+#ifndef DRIVER_MASK
+#define DRIVER_MASK 0x0f
+#endif
+#ifndef SUGGEST_MASK
+#define SUGGEST_MASK 0xf0
+#endif
+
+/* These defines are to isolate applictaions from kernel define changes */
+#define SG_ERR_DRIVER_OK        DRIVER_OK
+#define SG_ERR_DRIVER_BUSY      DRIVER_BUSY
+#define SG_ERR_DRIVER_SOFT      DRIVER_SOFT
+#define SG_ERR_DRIVER_MEDIA     DRIVER_MEDIA
+#define SG_ERR_DRIVER_ERROR     DRIVER_ERROR
+#define SG_ERR_DRIVER_INVALID   DRIVER_INVALID
+#define SG_ERR_DRIVER_TIMEOUT   DRIVER_TIMEOUT
+#define SG_ERR_DRIVER_HARD      DRIVER_HARD
+#define SG_ERR_DRIVER_SENSE     DRIVER_SENSE
+#define SG_ERR_SUGGEST_RETRY    SUGGEST_RETRY
+#define SG_ERR_SUGGEST_ABORT    SUGGEST_ABORT
+#define SG_ERR_SUGGEST_REMAP    SUGGEST_REMAP
+#define SG_ERR_SUGGEST_DIE      SUGGEST_DIE
+#define SG_ERR_SUGGEST_SENSE    SUGGEST_SENSE
+#define SG_ERR_SUGGEST_IS_OK    SUGGEST_IS_OK
+#define SG_ERR_DRIVER_MASK      DRIVER_MASK
+#define SG_ERR_SUGGEST_MASK     SUGGEST_MASK
+
+
+
+/* The following "print" functions send ACSII to stdout */
+extern void sg_print_command(const unsigned char * command);
+extern void sg_print_sense(const char * leadin,
+                           const unsigned char * sense_buffer, int sb_len);
+extern void sg_print_status(int masked_status);
+extern void sg_print_scsi_status(int scsi_status);
+extern void sg_print_host_status(int host_status);
+extern void sg_print_driver_status(int driver_status);
+
+/* sg_chk_n_print() returns 1 quietly if there are no errors/warnings
+   else it prints to standard output and returns 0. */
+extern int sg_chk_n_print(const char * leadin, int masked_status,
+                          int host_status, int driver_status,
+                          const unsigned char * sense_buffer, int sb_len);
+
+/* The following function declaration is for the sg version 3 driver. 
+   Only version 3 sg_err.c defines it. */
+struct sg_io_hdr;
+extern int sg_chk_n_print3(const char * leadin, struct sg_io_hdr * hp);
+
+
+/* The following "category" function returns one of the following */
+#define SG_ERR_CAT_CLEAN 0      /* No errors or other information */
+#define SG_ERR_CAT_MEDIA_CHANGED 1 /* interpreted from sense buffer */
+#define SG_ERR_CAT_RESET 2      /* interpreted from sense buffer */
+#define SG_ERR_CAT_TIMEOUT 3
+#define SG_ERR_CAT_RECOVERED 4  /* Successful command after recovered err */
+#define SG_ERR_CAT_SENSE 98     /* Something else is in the sense buffer */
+#define SG_ERR_CAT_OTHER 99     /* Some other error/warning has occurred */
+
+extern int sg_err_category(int masked_status, int host_status,
+               int driver_status, const unsigned char * sense_buffer,
+               int sb_len);
+
+extern int sg_err_category_new(int scsi_status, int host_status,
+               int driver_status, const unsigned char * sense_buffer,
+               int sb_len);
+
+/* The following function declaration is for the sg version 3 driver. 
+   Only version 3 sg_err.c defines it. */
+extern int sg_err_category3(struct sg_io_hdr * hp);
+
+/* Returns length of SCSI command given the opcode (first byte) */
+extern int sg_get_command_size(unsigned char opcode);
+
+extern void sg_get_command_name(unsigned char opcode, int buff_len, 
+                                char * buff);
+
+#endif
diff --git a/extras/multipath/sg_include.h b/extras/multipath/sg_include.h
new file mode 100644
index 0000000000..6b6dd6f372
--- /dev/null
+++ b/extras/multipath/sg_include.h
@@ -0,0 +1,44 @@
+#ifdef SG_KERNEL_INCLUDES
+  #define __user
+  typedef unsigned char u8;
+  #include "/usr/src/linux/include/scsi/sg.h"
+  #include "/usr/src/linux/include/scsi/scsi.h"
+#else
+  #ifdef SG_TRICK_GNU_INCLUDES
+    #include <linux/../scsi/sg.h>
+    #include <linux/../scsi/scsi.h>
+  #else
+    #include <scsi/sg.h>
+    #include <scsi/scsi.h>
+  #endif
+#endif
+
+/*
+  Getting the correct include files for the sg interface can be an ordeal.
+  In a perfect world, one would just write:
+    #include <scsi/sg.h>
+    #include <scsi/scsi.h>
+  This would include the files found in the /usr/include/scsi directory.
+  Those files are maintained with the GNU library which may or may not
+  agree with the kernel and version of sg driver that is running. Any
+  many cases this will not matter. However in some it might, for example
+  glibc 2.1's include files match the sg driver found in the lk 2.2
+  series. Hence if glibc 2.1 is used with lk 2.4 then the additional
+  sg v3 interface will not be visible.
+  If this is a problem then defining SG_KERNEL_INCLUDES will access the
+  kernel supplied header files (assuming they are in the normal place).
+  The GNU library maintainers and various kernel people don't like
+  this approach (but it does work).
+  The technique selected by defining SG_TRICK_GNU_INCLUDES worked (and
+  was used) prior to glibc 2.2 . Prior to that version /usr/include/linux
+  was a symbolic link to /usr/src/linux/include/linux .
+
+  There are other approaches if this include "mixup" causes pain. These
+  would involve include files being copied or symbolic links being
+  introduced.
+
+  Sorry about the inconvenience. Typically neither SG_KERNEL_INCLUDES
+  nor SG_TRICK_GNU_INCLUDES is defined.
+
+  dpg 20010415, 20030522
+*/