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#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_volume_label (int fd, unsigned long vlabel_start,
volume_label_t *vlabel) {
int rc;
if (lseek(fd, vlabel_start, SEEK_SET) < 0) {
/* fprintf(stderr, "Could not read volume label.\n"); */
return 2;
}
rc = read(fd, vlabel, sizeof(volume_label_t));
if (rc != sizeof(volume_label_t)) {
/* fprintf(stderr, "Could not read volume label, DASD is probably unformatted\n"); */
return 1;
}
return 0;
}
static int read_vlabel(dasd_information_t *dasd_info, int fd, int blksize, volume_label_t *vlabel) {
unsigned long pos;
pos = dasd_info->label_block * blksize;
memset(vlabel, 0, sizeof(volume_label_t));
return read_volume_label(fd, pos, vlabel);
}
#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);
devMakeInode(device, devname);
if((f = open(devname, O_RDONLY)) == -1) {
return 0;
}
if (ioctl(f, BLKSSZGET, &blksize) != 0) {
close(f);
/* fprintf(stderr, "Could not retrieve blocksize information!\n"); */
return 0;
}
if (ioctl(f, BIODASDINFO, &dasd_info) != 0) {
close(f);
/* fprintf(stderr, "Could not retrieve disk information!\n"); */
return 0;
}
ret = read_vlabel(&dasd_info, f, blksize, &vlabel);
close(f);
if (ret == 2) {
return 0;
} else if (ret == 1) { /* probably unformatted DASD */
/* fprintf(stderr, "Found a usable device: %s\n", devname); */
return 1;
}
memset(label, 0, 5);
memset(v4_hex, 0, 9);
strncpy(label, vlabel.volkey, 4);
sprintf(v4_hex, "%02x%02x%02x%02x", label[0], label[1], label[2], label[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;
fd = fopen ("/proc/dasd/devices", "r");
if(!fd) {
return NULL;
}
line = (char *)malloc(100*sizeof(char));
while (fgets (line, 100, fd) != NULL) {
if ((strstr(line, "unknown") != NULL)) {
continue;
}
ret = sscanf (line, "%[A-Za-z.0-9](ECKD) at ( %*d: %*d) is %s : %*s", port, devname);
if (ret == 2) {
if(!ports) {
ports = (char *)malloc(strlen(port) + 1);
strcpy(ports, port);
} else {
ports = (char *)realloc(ports, strlen(ports) + strlen(port) + 2);
strcat(ports, ",");
strcat(ports, port);
}
}
}
if (fd) fclose(fd);
return ports;
#endif
}
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