File s390-tools-sles12sp2-feat-01-dasd-query-host.patch of Package s390-tools

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File s390-tools-sles12sp2-feat-01-dasd-query-host.patch of Package s390-tools (Revision 9f18b4c037bfc00a5fa179490742ee7e)

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Subject: [PATCH] [FEAT LS1213] dasd: add query host access to volume support
From: Stefan Haberland <sth@linux.vnet.ibm.com>

Summary:     dasd: add query host access to volume support
Description: With this feature, applications can query if a DASD volume is
             online to another operating system instances by checking the 
             online status of all attached hosts from the storage server.
Upstream-ID: -
Problem-ID:  LS1213

--- a/dasdfmt/dasdfmt.8
+++ b/dasdfmt/dasdfmt.8
@@ -7,7 +7,7 @@ dasdfmt \- formatting of DASD (ECKD) dis
 .br
         [-r \fIcylinder\fR] [-b \fIblksize\fR] [-l \fIvolser\fR] [-d \fIlayout\fR]
 .br
-        [-L] [-V] [-F] [-k] \fIdevice\fR
+        [-L] [-V] [-F] [-k] [-C] \fIdevice\fR
 
 .SH DESCRIPTION
 \fBdasdfmt\fR formats a DASD (ECKD) disk drive to prepare it
@@ -70,6 +70,11 @@ Print version number and exit.
 Formats the device without checking, if the device is in use.
 
 .TP
+\fB-C\fR or \fB--check_host_count\fR
+Force dasdfmt to check the host access open count to ensure the device
+is not online on another operating system instance
+
+.TP
 \fB-d\fR \fIlayout\fR or \fB--disk_layout\fR=\fIlayout\fR
 Formats the device with compatible disk layout or linux disk layout.
 \fIlayout\fR is either \fIcdl\fR for the compatible disk layout
--- a/dasdfmt/dasdfmt.c
+++ b/dasdfmt/dasdfmt.c
@@ -18,6 +18,8 @@
 #include "util_proc.h"
 #include "dasd_sys.h"
 
+#define BUSIDSIZE  8
+
 /* Full tool name */
 static const char tool_name[] = "dasdfmt: zSeries DASD format program";
 
@@ -46,7 +48,7 @@ print_version (void)
  */
 static void exit_usage(int exitcode)
 {
-	printf("Usage: %s [-htvypPLVFk]\n"
+	printf("Usage: %s [-htvypPLVFkC]\n"
 	       "	       [-l <volser>      | --label=<volser>]\n"
 	       "               [-b <blocksize>   | --blocksize=<blocksize>]\n"
 	       "               [-d <disk layout> | --disk_layout=<disk layout>]\n"
@@ -65,6 +67,9 @@ static void exit_usage(int exitcode)
 	       "       -v means verbose mode\n"
 	       "       -F means don't check if the device is in use\n"
 	       "       -k means keep volume serial\n"
+	       "       -C or --check_host_count means force dasdfmt to check\n"
+	       "          the host access open count to ensure the device\n"
+	       "          is not online on another operating system instance\n"
                "       --norecordzero prevent storage server from modifying"
                " record 0\n\n"
 	       "       <volser> is the volume identifier, which is converted\n"
@@ -190,7 +195,6 @@ static void get_device_name(dasdfmt_info
 	}
 }
 
-
 /*
  * initialize the dasdfmt info structure
  */
@@ -214,6 +218,7 @@ static void init_info(dasdfmt_info_t *in
 	info->node_specified    = 0;
 	info->device_id         = 0;
 	info->keep_volser	= 0;
+	info->force_host        = 0;
 }
 
 
@@ -776,6 +781,7 @@ static void do_format_dasd(dasdfmt_info_
 	dasd_information_t  dasd_info;
 	struct dasd_eckd_characteristics *characteristics;
 	unsigned int cylinders, heads;
+	int count;
 
 	if (info->verbosity > 0) printf("Retrieving disk geometry...\n");
 
@@ -835,6 +841,27 @@ static void do_format_dasd(dasdfmt_info_
 	if ((info->verbosity > 0) || (!info->withoutprompt)) 
 		dasdfmt_print_info(info, vlabel, cylinders, heads, p);
 
+	count = u2s_get_host_access_count(info->devname);
+	if (info->force_host) {
+		if (count > 1) {
+			ERRMSG_EXIT(EXIT_FAILURE,
+				    "\n%s: Disk %s is online on OS instances in %d different LPARs.\n"
+				    "Note: Your installation might include z/VM systems that are configured to\n"
+				    "automatically vary on disks, regardless of whether they are subsequently used.\n\n",
+				    prog_name, info->devname, count);
+		} else if (count < 0) {
+			ERRMSG("\nHosts access information not available for disk %s.\n\n",
+			       info->devname);
+			return;
+		}
+	} else if (count > 1)
+		ERRMSG("\nWARNING:\n"
+		       "Disk %s is online on operating system instances in %d different LPARs.\n"
+		       "Ensure that the disk is not being used by a system outside your LPAR.\n"
+		       "Note: Your installation might include z/VM systems that are configured to\n"
+		       "automatically vary on disks, regardless of whether they are subsequently used.\n",
+		       info->devname, count);
+
 	if (!info->testmode) {
 		if (!info->withoutprompt) {
 			printf("\n--->> ATTENTION! <<---\n");
@@ -916,10 +943,6 @@ int main(int argc,char *argv[])
  			info.force=1;
 			break;
 
-		case 'C':
-                	format_params.intensity |= DASD_FMT_INT_COMPAT;
-			break;
-
                 case 'd' :
                         if (strncmp(optarg,"cdl",3)==0)
 			{
@@ -1017,6 +1040,9 @@ int main(int argc,char *argv[])
 		case 'k' :
 			info.keep_volser=1;
 			break;
+		case 'C':
+			info.force_host = 1;
+			break;
 		case -1:
 			/* End of options string - start of devices list */
 			info.device_id = optind;
--- a/dasdfmt/dasdfmt.h
+++ b/dasdfmt/dasdfmt.h
@@ -214,7 +214,7 @@ typedef struct format_data_t {
 	if (*endptr) ERRMSG_EXIT(EXIT_MISUSE,"%s: " str " "    \
 	"is in invalid format\n",prog_name);}
 
-#define dasdfmt_getopt_string "b:n:l:f:d:m:r:hpPLtyvVFk"
+#define dasdfmt_getopt_string "b:n:l:f:d:m:r:hpPLtyvVFkC"
 
 static struct option dasdfmt_getopt_long_options[]=
 {
@@ -233,6 +233,7 @@ static struct option dasdfmt_getopt_long
         { "help",        0, 0, 'h'},
         { "keep_volser", 0, 0, 'k'},
         { "norecordzero",  0, 0, 'z'},
+	{ "check_host_count",  0, 0, 'C'},
         {0, 0, 0, 0}
 };
 
@@ -265,6 +266,7 @@ typedef struct dasdfmt_info {
         int   node_specified;
         int   device_id;
         int   keep_volser;
+	int   force_host;
 } dasdfmt_info_t;
 
 
--- a/fdasd/fdasd.8
+++ b/fdasd/fdasd.8
@@ -4,11 +4,11 @@ fdasd \- partitioning tool.
 .SH SYNOPSIS
 interactive mode:
 .br
-     \fBfdasd\fR [-s] [-r] \fIdevice\fR
+     \fBfdasd\fR [-s] [-r] [-C] \fIdevice\fR
 .br
 command line mode:
 .br
-     \fBfdasd\fR [-s] [-r] {-a[-k|-l \fIvolser\fR]|-i|-p|-c \fIconf_file\fR} 
+     \fBfdasd\fR [-s] [-r] [-C] {-a[-k|-l \fIvolser\fR]|-i|-p|-c \fIconf_file\fR}
 [-f \fI[type,blocksize]\fR] \fIdevice\fR
 .br
 help:
@@ -131,6 +131,11 @@ In combination with the -s option fdasd
 partition table.
 
 .TP
+\fB-C\fR or \fB--check_host_count\fR
+Force fdasd to check the host access open count to ensure the device
+is not online on another operating system instance
+
+.TP
 \fB-f\fR \fI[type,blocksize]\fR or \fB--force\fR \fI[type,blocksize]\fR
 Force fdasd to work on non DASD devices.
 .br
--- a/fdasd/fdasd.c
+++ b/fdasd/fdasd.c
@@ -369,7 +369,10 @@ fdasd_usage (void)
                 "                         found in CONFIGFILE\n"
 		"-i, --volser             Print volume serial\n"
 		"-p, --table              Print partition table\n"
-		"-f, --force              Force fdasd to work on non DASD devices\n");
+		"-f, --force              Force fdasd to work on non DASD devices\n"
+		"-C, --check_host_count   Force fdasd to check the host access\n"
+		"                         open count to ensure the device is not\n"
+		"                         online on another operating system instance\n");
 }
 
 
@@ -572,6 +575,9 @@ fdasd_parse_options (fdasd_anchor_t *anc
 			anc->force_virtual++;
 			fdasd_parse_force_options(anc, optarg);
 			break;
+		case 'C':
+			anc->force_host++;
+			break;
 		case -1:
 			/* End of options string - start of devices list */
 			break;
@@ -824,6 +830,7 @@ fdasd_verify_device (fdasd_anchor_t *anc
 {
 	struct stat dst;
 	char err_str[ERROR_STRING_SIZE];
+	int count;
 
 	if ((stat(name, &dst)) < 0 ) {
 		snprintf(err_str, ERROR_STRING_SIZE,
@@ -856,6 +863,29 @@ fdasd_verify_device (fdasd_anchor_t *anc
 		fdasd_error(anc, device_verification_failed, err_str);
 	}
 
+	count = u2s_get_host_access_count(name);
+	if (anc->force_host) {
+		if (count > 1) {
+			snprintf(err_str, ERROR_STRING_SIZE,
+				 "Disk %s is online on operating system instances in %d different LPARs.\n"
+				 "Note: Your installation might include z/VM systems that are configured to\n"
+				 "automatically vary on disks, regardless of whether they are subsequently used.\n",
+				 name, count);
+			fdasd_error(anc, device_verification_failed, err_str);
+		} else if (count < 0) {
+			snprintf(err_str, ERROR_STRING_SIZE,
+				 "Hosts access information not available for disk %s.\n",
+				 name);
+			fdasd_error(anc, device_verification_failed, err_str);
+		}
+	} else if (count > 1)
+		printf("\nWARNING:\n"
+		       "Disk %s is online on operating system instances in %d different LPARs.\n"
+		       "Ensure that the disk is not being used by a system outside your LPAR.\n"
+		       "Note: Your installation might include z/VM systems that are configured to\n"
+		       "automatically vary on disks, regardless of whether they are subsequently used.\n\n",
+		       name, count);
+
 	if (anc->verbose)
 		printf("Verification successful for '%s' (%d/%d)\n", name,
 		       (unsigned short) major(dst.st_rdev),
--- a/fdasd/fdasd.h
+++ b/fdasd/fdasd.h
@@ -157,22 +157,23 @@ struct dasd_eckd_characteristics {
 #define PARTITION_GPFS 5
 
 static struct option fdasd_long_options[] = {
-	{ "version",     no_argument,       NULL, 'v'},
-	{ "auto",        no_argument,       NULL, 'a'},
-	{ "silent",      no_argument,       NULL, 's'},
-	{ "verbose",     no_argument,       NULL, 'r'},
-	{ "label",       required_argument, NULL, 'l'},
-	{ "config",      required_argument, NULL, 'c'},
-	{ "help",        no_argument,       NULL, 'h'},
-	{ "table",       no_argument,       NULL, 'p'},
-	{ "volser",      no_argument,       NULL, 'i'},
-	{ "keep_volser", no_argument,       NULL, 'k'},
-	{ "force",       optional_argument, NULL, 'f'},
-	{ 0,             0,                 0,    0  }
+	{ "version",          no_argument,       NULL, 'v'},
+	{ "auto",             no_argument,       NULL, 'a'},
+	{ "silent",           no_argument,       NULL, 's'},
+	{ "verbose",          no_argument,       NULL, 'r'},
+	{ "label",            required_argument, NULL, 'l'},
+	{ "config",           required_argument, NULL, 'c'},
+	{ "help",             no_argument,       NULL, 'h'},
+	{ "table",            no_argument,       NULL, 'p'},
+	{ "volser",           no_argument,       NULL, 'i'},
+	{ "keep_volser",      no_argument,       NULL, 'k'},
+	{ "force",            optional_argument, NULL, 'f'},
+	{ "check_host_count", no_argument,       NULL, 'C'},
+	{ 0,                  0,                 0,    0  }
 };
 
 /* Command line option abbreviations */
-static const char option_string[] = "vasrl:c:hpikf::";
+static const char option_string[] = "vasrl:c:hpikf::C";
 
 struct fdasd_options {
 	char *device;
@@ -214,6 +215,7 @@ typedef struct fdasd_anchor {
 	int print_volser;
 	int keep_volser;
 	int force_virtual;
+	int force_host;
 	int big_disk;
 	int silent;
 	int verbose;
--- a/include/libzds.h
+++ b/include/libzds.h
@@ -803,6 +803,7 @@ int lzds_zdsroot_extract_datasets_from_d
 void lzds_DS1RECFM_to_recfm(char DS1RECFM, char *buffer);
 
 
+int lzds_analyse_open_count(struct zdsroot *root, int warn);
 
 /** @} */ /* end of group libzds_functions_helper */
 
--- a/include/u2s.h
+++ b/include/u2s.h
@@ -13,7 +13,8 @@
 
 #define U2S_BUS_ID_SIZE    32
 
-int
-u2s_getbusid(char * devicenode, char * busid);
+int u2s_getbusid(char *, char *);
+int u2s_read_attribute(char *, char *, char *, size_t);
+int u2s_get_host_access_count(char *);
 
 #endif /* U2S_H */
--- a/libu2s/u2s.c
+++ b/libu2s/u2s.c
@@ -17,6 +17,7 @@
 #include <fcntl.h>
 #include <sys/sysmacros.h>
 #include <dirent.h>
+#include <stdlib.h>
 
 #include "u2s.h"
 
@@ -282,3 +283,45 @@ int u2s_getbusid(char *devicenode, char
 
 	return rc;
 }
+
+/*
+ * Attempts to find the sysfs entry for the given busid and reads
+ * the contents of a specified attribute to the buffer
+ */
+int u2s_read_attribute(char *busid, char *attribute, char *buffer,
+		       size_t count)
+{
+	char path[100];
+	int rc, fd;
+	ssize_t rcount;
+
+	rc = 0;
+	snprintf(path, sizeof(path), "/sys/bus/ccw/devices/%s/%s",
+		 busid, attribute);
+	fd = open(path, O_RDONLY);
+	if (fd < 0)
+		return errno;
+	rcount = read(fd, buffer, count);
+	if (rcount < 0)
+		rc = errno;
+	close(fd);
+	return rc;
+}
+
+int u2s_get_host_access_count(char *devicenode)
+{
+	char busid[BUSIDSIZE];
+	unsigned long value;
+	char buffer[10];
+	char *endp;
+
+	u2s_getbusid(devicenode, busid);
+	u2s_read_attribute(busid, "host_access_count", buffer, sizeof(buffer));
+
+	value = strtoul(buffer, &endp, 0);
+
+	if (endp == buffer)
+		return -EINVAL;
+
+	return value;
+}
--- a/libzds/Makefile
+++ b/libzds/Makefile
@@ -8,7 +8,7 @@ CFLAGS += -D_FILE_OFFSET_BITS=64
 
 all: libzds.a
 
-libzds.a: libzds.o $(rootdir)/libutil/util_list.o $(rootdir)/libvtoc/vtoc.o
+libzds.a: libzds.o $(rootdir)/libutil/util_list.o $(rootdir)/libvtoc/vtoc.o $(rootdir)/libu2s/u2s.o
 
 libzds.o: ../include/libzds.h
 
--- a/libzds/libzds.c
+++ b/libzds/libzds.c
@@ -29,6 +29,7 @@
 #include "libzds.h"
 
 #include "util.h"
+#include "u2s.h"
 
 #include <malloc.h>
 #include <linux/types.h>
@@ -72,6 +73,8 @@ struct errorlog {
  */
 #define ERRORMSG  240
 
+#define BUSIDSIZE  8
+
 /**
  * @brief An internal structure that represents an entry in the error log.
  */
@@ -3760,15 +3763,46 @@ void lzds_DS1RECFM_to_recfm(char DS1RECF
 	 */
 }
 
+int lzds_analyse_open_count(struct zdsroot *root, int warn)
+{
+	struct dasd *dasd;
+	int value;
+	int rc = 0;
 
+	util_list_iterate(root->dasdlist, dasd) {
+		value = u2s_get_host_access_count(dasd->device);
 
+		if (value < 0) {
+			fprintf(stderr,
+				"Hosts access information not available for disk %s.\n",
+				dasd->device);
+			rc = value;
+			continue;
+		}
 
+		if (value == 1)
+			continue;
 
+		if (warn)
+			fprintf(stderr,
+				"\nWARNING:\n"
+				"Disk %s is online on operating system instances in %d different LPARs.\n"
+				"Ensure that the disk is not being used by a system outside your LPAR.\n"
+				"Note: Your installation might include z/VM systems that are configured to\n"
+				"automatically vary on disks, regardless of whether they are subsequently used.\n",
+				dasd->device, value);
+		else {
+			fprintf(stderr,
+				"\nERROR:\n"
+				"Disk %s is online on operating system instances in %d different LPARs.\n"
+				"Ensure that the disk is not being used by a system outside your LPAR.\n"
+				"Note: Your installation might include z/VM systems that are configured to\n"
+				"automatically vary on disks, regardless of whether they are subsequently used.\n",
+				dasd->device, value);
+			rc = -EACCES;
+		}
+	}
 
-
-
-
-
-
-
+	return rc;
+}
 
--- a/zconf/lsdasd
+++ b/zconf/lsdasd
@@ -30,6 +30,8 @@ function PrintUsage() {
 		 		Print old version of lsdasd output.
 		 	-l|--long
 		 		Print extended information about DASDs.
+		 	-H|--host-access-list
+		 		Print information about hosts accessing DASDs.
 		 	-v|--verbose
 		 		For compatibility/future use. Currently ignored.
 		 	--version
@@ -115,6 +117,33 @@ function listDASDDeviceDirectories() {
 }
 
 #------------------------------------------------------------------------------
+# find dasd directory in debugfs
+#------------------------------------------------------------------------------
+function findDASDDebugfsDirectorie() {
+    local mntentries
+
+    while read -a mntentries
+    do
+	if [[ "${mntentries[2]}" == "debugfs" ]]
+	then
+	    DASD_DBF_DIR="${mntentries[1]}"
+	    break;
+	fi
+    done < /etc/mtab
+    if [[ "$DASD_DBF_DIR" == "" ]]
+    then
+	echo "$CMD: No debugfs mount point found" >&2
+	exit 1
+    fi
+    DASD_DBF_DIR="$DASD_DBF_DIR/dasd"
+    if [[ ! -d "$DASD_DBF_DIR" ]]
+    then
+	echo "$CMD: Default DASD debugfs directory $DASD_DBF_DIR does not exist" >&2
+	exit 1
+    fi
+}
+
+#------------------------------------------------------------------------------
 # gather device data and call appropriate output function
 #------------------------------------------------------------------------------
 function gatherDeviceData() {
@@ -197,6 +226,8 @@ function gatherDeviceData() {
 			extended
 		elif [[ "$PRINTUID" == "true" ]]; then
 			uid
+		elif [[ "$OUTPUT" == "host" ]]; then
+			host
 		else
 			newoutput
 		fi
@@ -527,6 +558,104 @@ function extended()
 	        "${HPF_PATHS[@]}" ;
 }
 
+function host()
+{
+findDASDDebugfsDirectorie
+
+if [[ ! -f "$DASD_DBF_DIR/$BUSID/host_access_list" ]]
+then
+    printf "\n%s: hosts access information not available\n" "$BUSID"
+    return
+fi
+
+local temp=`mktemp /tmp/lsdasd.XXXXXX`
+if test -w $temp ; then :; else
+	printf "\nCreating temporary file failed\n"
+	return
+fi
+
+cat $DASD_DBF_DIR/$BUSID/host_access_list > $temp 2> /dev/null
+ret=$?
+if [[ $ret -ne 0 ]]
+then
+    printf "%s: hosts access information not available\n" "$BUSID"
+    rm -f $temp
+    return $ret
+fi
+
+unset index
+unset array
+declare -a array
+
+index=(pgid status_flags sysplex_name supported_cylinder timestamp)
+
+for element in ${index[@]}
+do
+	count=0
+
+	declare -a $element
+	OLDIFS=$IFS
+	IFS=$'\n'
+	for value in `grep $element $temp`
+	do
+		(( ++count ))
+		value=$(echo -e $value | cut -d ' ' -f2)
+		eval $element[$count]=$value
+	done
+	IFS=$OLDIFS
+done
+
+printf "Host information for %s\n" "$BUSID";
+printf "Path-Group-ID          LPAR  CPU   FL  Status  Sysplex      Max_Cyls        Time\n";
+printf "================================================================================\n";
+
+# mask bits for online and reserved state
+online_reserved_mask=0xE0
+
+# print name value lists
+for i in `seq 1 $count`;
+do
+    # get flags field
+    value=${status_flags[$i]}
+    # mark as hex value
+    value=0x$value
+    # mask online and reserved bits
+    value=$(($value & $online_reserved_mask))
+
+    case $value in
+	0 ) # 0x00
+	    STATE="OFF"
+	    ;;
+	32 ) # 0x20
+	    STATE="OFF-RSV"
+	    ;;
+	64 ) # 0x40
+	    STATE="ON"
+	    ;;
+	96 ) # 0x60
+	    STATE="ON-RSV"
+	    ;;
+	* )
+	    STATE="-"
+	    ;;
+    esac
+
+    printf "%22s %02s %07s  %02s  %-6s  %-8s  %11u  %10lu\n" \
+	"${pgid[$i]}" \
+	"${pgid[$i]:4:2}" \
+	"${pgid[$i]:6:4}" \
+	"${status_flags[$i]}" \
+	"$STATE" \
+	"${sysplex_name[$i]}" \
+	"${supported_cylinder[$i]}" \
+	"${timestamp[$i]}" \
+	;
+done
+printf "\n";
+
+rm -f $temp
+}
+
 function uid()
 {
 	#-------------------------------------------#
@@ -586,6 +715,9 @@ while [ $# -gt 0 ]; do
 	--long|-l)
 		OUTPUT="extended"
 		;;
+	--host-access-list|-H)
+		OUTPUT="host"
+		;;
 	--version)
 		PrintVersion
 		exit 0
@@ -626,8 +758,13 @@ fi
 
 # gather information on devices in list
 PROCESSING=" $PROCESSING | gatherDeviceData "
+
 # sort resulting list
-PROCESSING=" $PROCESSING | sort -t: -k1n -k2 | cut -d: -f3- "
+if [[ "$OUTPUT" == "host" ]]; then
+    PROCESSING=" $PROCESSING"
+else
+    PROCESSING=" $PROCESSING | sort -t: -k1n -k2 | cut -d: -f3- "
+fi
 
 if  [[ "$PRINTUID" == "true" ]] && [[ "$OUTPUT" != "old" ]]; then
 	printf "Bus-ID    Name      UID\n"
--- a/zconf/lsdasd.8
+++ b/zconf/lsdasd.8
@@ -40,11 +40,14 @@ Include only base devices.
 Old output of lsdasd for compatibility.
 .TP
 .BR -l | --long
-Extended output of lsdasd including UID, attributes and path information.
+Extended output of lsdasd including UID and attributes.
 .TP
 .BR -u | --uid
 Output includes and is sorted by UID.
 .TP
+.BR -H | --host-acces
+Show information about all hosts using this device.
+.TP
 .BR -v | --verbose
 Only for compatibility (and maybe future) use. This option currently does
 nothing.
--- a/zdsfs/zdsfs.1
+++ b/zdsfs/zdsfs.1
@@ -150,6 +150,10 @@ If \fI<s>\fR is set to 0, no seek histor
 case `seek' is still supported, but a `seek' operation might result in a
 read from the beginning of the data set.
 
+.TP
+\fB\-o\fR check_host_count
+Stop processing if the device is used by another operating system instance.
+
 .SS "Applicable FUSE options (version 2.8):"
 This is a selected subset of all FUSE options. Use the zdsfs
 \fB\--help\fR option to print a full list.
--- a/zdsfs/zdsfs.c
+++ b/zdsfs/zdsfs.c
@@ -39,6 +39,7 @@ struct zdsfs_info {
 	int devcount;
 	int allow_inclomplete_multi_volume;
 	int keepRDW;
+	int host_count;
 	unsigned int tracks_per_frame;
 	unsigned long long seek_buffer_size;
 	struct zdsroot *zdsroot;
@@ -765,6 +766,7 @@ static const struct fuse_opt zdsfs_opts[
 	FUSE_OPT_KEY("seekbuffer=",     KEY_SEEKBUFFER),
 	ZDSFS_OPT("rdw",                keepRDW, 1),
 	ZDSFS_OPT("ignore_incomplete",  allow_inclomplete_multi_volume, 1),
+	ZDSFS_OPT("check_host_count",   host_count, 1),
 	FUSE_OPT_END
 };
 
@@ -790,7 +792,10 @@ static void usage(const char *progname)
 "                           data set are missing\n"
 "    -o tracks=N            Size of the track buffer in tracks (default 128)\n"
 "    -o seekbuffer=S        Upper limit in bytes for the seek history buffer\n"
-"                           size (default 1048576)\n", progname);
+"                           size (default 1048576)\n"
+"    -o check_host_count    Stop processing if the device is used by another\n"
+"                           operating system instance\n"
+		, progname);
 }
 
 static void zdsfs_process_device(const char *device)
@@ -1014,6 +1019,17 @@ int main(int argc, char *argv[])
 			argv[0]);
 		exit(1);
 	}
+
+	if (zdsfsinfo.host_count) {
+		/* check, print error and exit if multiple online */
+		rc = lzds_analyse_open_count(zdsfsinfo.zdsroot, 0);
+		if (rc == -EACCES)
+			goto cleanup;
+	} else {
+		/* check, print warning if multiple online */
+		lzds_analyse_open_count(zdsfsinfo.zdsroot, 1);
+	}
+
 	rc = zdsfs_verify_datasets();
 	if (rc)
 		goto cleanup;

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File s390-tools-sles12sp2-feat-01-dasd-query-host.patch of Package s390-tools (Revision 9f18b4c037bfc00a5fa179490742ee7e)

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