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/*
* dasd.c
*
* Copyright (C) 2007 Red Hat, Inc. All rights reserved.
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/fs.h>
#include "isys.h"
#if defined(__s390__) || defined(__s390x__)
#define u8 __u8
#define u16 __u16
#define u32 __u32
#define u64 __u64
#include <asm/vtoc.h>
#include <asm/dasd.h>
typedef struct vtoc_volume_label volume_label_t;
#endif
#if defined(__s390__) || defined(__s390x__)
/* s390 stuff to detect DASDs */
static int read_vlabel(dasd_information_t *dasd_info, int fd, int blksize,
volume_label_t *vlabel) {
int rc;
unsigned long vlabel_start = dasd_info->label_block * blksize;
memset(vlabel, 0, sizeof(volume_label_t));
if (lseek(fd, vlabel_start, SEEK_SET) < 0) {
return 2;
}
rc = read(fd, vlabel, sizeof(volume_label_t));
if (rc != sizeof(volume_label_t)) {
return 1;
}
return 0;
}
#endif
int isUsableDasd(char *device) {
#if !defined(__s390__) && !defined(__s390x__)
return 0;
#else
char devname[16];
char label[5], v4_hex[9];
char l4ebcdic_hex[] = "d3d5e7f1"; /* LNX1 */
char cms1_hex[] = "c3d4e2f1"; /* CMS1 */
int f, ret, blksize;
dasd_information_t dasd_info;
volume_label_t vlabel;
memset(&dasd_info, 0, sizeof(dasd_info));
strcpy(devname, "/dev/");
strcat(devname, device);
if ((f = open(devname, O_RDONLY)) == -1)
return 0;
if (ioctl(f, BLKSSZGET, &blksize) != 0) {
close(f);
return 0;
}
if (ioctl(f, BIODASDINFO, &dasd_info) != 0) {
close(f);
return 0;
}
ret = read_vlabel(&dasd_info, f, blksize, &vlabel);
close(f);
if (ret == 2)
return 0;
else if (ret == 1) /* probably unformatted DASD */
return 1;
memset(label, 0, 5);
memset(v4_hex, 0, 9);
strncpy(label, vlabel.volkey, 4);
ret = sprintf(v4_hex, "%02x%02x%02x%02x", label[0], label[1],
label[2], label[3]);
if (ret < 0 || ret < strlen(cms1_hex))
return 3;
if (!strncmp(v4_hex, cms1_hex, 9))
return 0;
if (!strncmp(v4_hex, l4ebcdic_hex, 9))
return 2;
return 1;
#endif
}
int isLdlDasd(char * device) {
return (isUsableDasd(device) == 2);
}
char *getDasdPorts() {
#if !defined(__s390__) && !defined(__s390x__)
return 0;
#else
char * line, *ports = NULL;
char devname[7];
char port[10];
FILE *fd;
int ret, sz;
fd = fopen("/proc/dasd/devices", "r");
if (!fd)
return NULL;
if ((line = (char *)malloc(100 * sizeof(char))) == NULL) {
fclose(fd);
return NULL;
}
while (fgets(line, 100, fd) != NULL) {
if ((strstr(line, "unknown") != NULL))
continue;
if (strstr(line, "(FBA )") != NULL)
ret = sscanf(line, "%[A-Za-z.0-9](FBA ) at ( %*d: %*d) is %s : %*s", port, devname);
else
ret = sscanf(line, "%[A-Za-z.0-9](ECKD) at ( %*d: %*d) is %s : %*s", port, devname);
if (ret == 2) {
if (!ports) {
sz = strlen(port) + 1;
if ((ports = (char *) malloc(sz)) == NULL) {
fclose(fd);
return NULL;
}
ports = strcpy(ports, port);
} else {
sz = strlen(ports) + strlen(port) + 2;
if ((ports = (char *) realloc(ports, sz)) == NULL) {
fclose(fd);
return NULL;
}
ports = strcat(ports, ",");
ports = strcat(ports, port);
}
}
}
fclose(fd);
return ports;
#endif
}
/* vim:set shiftwidth=4 softtabstop=4: */
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