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/*
* Copyright IBM Corp 2008
* Author: Hans-Joachim Picht <hans@linux.vnet.ibm.com>
*
* Linux for System z shutdown actions
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <ctype.h>
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <signal.h>
#include <syslog.h>
#include <pthread.h>
#include "chreipl.h"
/*
* check if the specified device number is a valid device number
* which can be found in the /sys/bus/ccw/drivers/dasd-eckd/
* structure
*
* this does not work when booting from tape
*/
int isccwdev(const char *devno)
{
char path[4096];
sprintf(path, "/sys/bus/ccw/drivers/dasd-eckd/%s", devno);
if (access(path, R_OK) == 0)
return 0;
sprintf(path, "/sys/bus/ccw/drivers/dasd-fba/%s", devno);
if (access(path, R_OK) == 0)
return 0;
return -1;
}
int get_ccw_devno_old_sysfs(char *device, char *devno)
{
FILE *filp;
int len, errorpath, rc;
char path1[4096];
char buf[4096];
char *match, *s1, *s2;
errorpath = 1;
rc = 0;
sprintf(path1, "/sys/block/%s/uevent", device);
filp = fopen(path1, "r");
if (!filp) {
rc = -1;
return rc;
}
/*
* the uevent file contains an entry like this:
* PHYSDEVPATH=/devices/css0/0.0.206a/0.0.7e78
*/
while (fscanf(filp, "%s", buf) >= 0) {
match = strstr(buf, "PHYSDEVPATH");
if (match != NULL)
break;
}
s1 = strchr(buf, '/');
s2 = strrchr(buf, '/');
len = s2-s1;
strncpy(devno, s2 + 1, sizeof(devno));
devno[len] = '\0';
fclose(filp);
return 0;
}
int get_ccw_devno_new_sysfs(char *device, char *devno)
{
int len, errorpath, rc;
char path2[4096];
char buf[4096];
char *s1, *s2;
ssize_t linksize;
errorpath = 1;
s1 = NULL;
s2 = NULL;
len = 0;
sprintf(path2, "/sys/block/%s/device", device);
linksize = readlink(path2, buf, sizeof(buf)-1);
if (linksize == -1) {
errorpath = 2;
rc = -1;
return rc;
} else {
/*
* the output has the following format:
* ../../../0.0.4e13
*/
s1 = strchr(buf, '/');
s2 = strrchr(buf, '/');
len = s2 - s1 + 2;
if (s1 == NULL || s2 == NULL || len <= 0) {
rc = -1;
fprintf(stderr, "%s: Can not open %s: %s\n",
name, path2, strerror(errno));
return rc;
}
}
strncpy(devno, s2 + 1, sizeof(devno));
devno[len] = '\0';
return 0;
}
/*
* return the device number for a device
* dasda can be found in /sys/block/dasda/uevent or in a
* symbolic link in the same directory. the first file only
* contains the relevant information if we run on a kernel with
* has the following kernel option enabled:
* CONFIG_SYSFS_DEPRECATED
*
* This does not work when booting from tape
*/
int get_ccw_devno(char *device, char *devno)
{
if (get_ccw_devno_old_sysfs(device, devno) != 0) {
if (get_ccw_devno_new_sysfs(device, devno) != 0) {
fprintf(stderr, "%s: Failed to lookup the device number\n",
name);
return -1;
}
}
return 0;
}
int get_ccw_dev(char *partition, char *device)
{
char *stop;
stop = strrchr(partition, '/');
if (stop == NULL)
return -1;
strncpy(device, stop+1, 8);
return 0;
}
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