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/*
* node_device_hal_linuc.c: Linux specific code to gather device data
* not available through HAL.
*
* Copyright (C) 2009-2011 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <config.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <stdlib.h>
#include "node_device_driver.h"
#include "node_device_hal.h"
#include "virterror_internal.h"
#include "memory.h"
#include "logging.h"
#include "virfile.h"
#define VIR_FROM_THIS VIR_FROM_NODEDEV
#ifdef __linux__
static int open_wwn_file(const char *prefix,
int host,
const char *file,
int *fd)
{
int retval = 0;
char *wwn_path = NULL;
if (virAsprintf(&wwn_path, "%s/host%d/%s", prefix, host, file) < 0) {
virReportOOMError();
retval = -1;
goto out;
}
/* fd will be closed by caller */
if ((*fd = open(wwn_path, O_RDONLY)) != -1) {
VIR_DEBUG("Opened WWN path '%s' for reading",
wwn_path);
} else {
VIR_ERROR(_("Failed to open WWN path '%s' for reading"),
wwn_path);
}
out:
VIR_FREE(wwn_path);
return retval;
}
int read_wwn_linux(int host, const char *file, char **wwn)
{
char *p = NULL;
int fd = -1, retval = 0;
char buf[65] = "";
if (open_wwn_file(LINUX_SYSFS_FC_HOST_PREFIX, host, file, &fd) < 0) {
goto out;
}
if (saferead(fd, buf, sizeof(buf) - 1) < 0) {
retval = -1;
VIR_DEBUG("Failed to read WWN for host%d '%s'",
host, file);
goto out;
}
p = strstr(buf, "0x");
if (p != NULL) {
p += strlen("0x");
} else {
p = buf;
}
*wwn = strndup(p, sizeof(buf));
if (*wwn == NULL) {
virReportOOMError();
retval = -1;
goto out;
}
p = strchr(*wwn, '\n');
if (p != NULL) {
*p = '\0';
}
out:
VIR_FORCE_CLOSE(fd);
return retval;
}
int check_fc_host_linux(union _virNodeDevCapData *d)
{
char *sysfs_path = NULL;
int retval = 0;
struct stat st;
VIR_DEBUG("Checking if host%d is an FC HBA", d->scsi_host.host);
if (virAsprintf(&sysfs_path, "%shost%d",
LINUX_SYSFS_FC_HOST_PREFIX,
d->scsi_host.host) < 0) {
virReportOOMError();
retval = -1;
goto out;
}
if (stat(sysfs_path, &st) != 0) {
/* Not an FC HBA; not an error, either. */
goto out;
}
d->scsi_host.flags |= VIR_NODE_DEV_CAP_FLAG_HBA_FC_HOST;
if (read_wwn(d->scsi_host.host,
"port_name",
&d->scsi_host.wwpn) == -1) {
VIR_ERROR(_("Failed to read WWPN for host%d"),
d->scsi_host.host);
retval = -1;
goto out;
}
if (read_wwn(d->scsi_host.host,
"node_name",
&d->scsi_host.wwnn) == -1) {
VIR_ERROR(_("Failed to read WWNN for host%d"),
d->scsi_host.host);
retval = -1;
}
if (read_wwn(d->scsi_host.host,
"fabric_name",
&d->scsi_host.fabric_wwn) == -1) {
VIR_ERROR(_("Failed to read fabric WWN for host%d"),
d->scsi_host.host);
retval = -1;
goto out;
}
out:
if (retval == -1) {
VIR_FREE(d->scsi_host.wwnn);
VIR_FREE(d->scsi_host.wwpn);
VIR_FREE(d->scsi_host.fabric_wwn);
}
VIR_FREE(sysfs_path);
return retval;
}
int check_vport_capable_linux(union _virNodeDevCapData *d)
{
char *sysfs_path = NULL;
struct stat st;
int retval = 0;
if (virAsprintf(&sysfs_path,
"%shost%d%s",
LINUX_SYSFS_FC_HOST_PREFIX,
d->scsi_host.host,
LINUX_SYSFS_VPORT_CREATE_POSTFIX) < 0) {
virReportOOMError();
retval = -1;
goto out;
}
if (stat(sysfs_path, &st) == 0) {
d->scsi_host.flags |= VIR_NODE_DEV_CAP_FLAG_HBA_VPORT_OPS;
goto out;
}
VIR_FREE(sysfs_path);
if (virAsprintf(&sysfs_path,
"%shost%d%s",
LINUX_SYSFS_SCSI_HOST_PREFIX,
d->scsi_host.host,
LINUX_SYSFS_VPORT_CREATE_POSTFIX) < 0) {
virReportOOMError();
retval = -1;
goto out;
}
if (stat(sysfs_path, &st) == 0) {
d->scsi_host.flags |= VIR_NODE_DEV_CAP_FLAG_HBA_VPORT_OPS;
} else {
/* Not a vport capable HBA; not an error, either. */
VIR_DEBUG("No vport operation path found for host%d",
d->scsi_host.host);
}
out:
VIR_FREE(sysfs_path);
return retval;
}
#endif /* __linux__ */
|
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