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|
/*
* node_device.c: node device enumeration
*
* Copyright (C) 2010-2011 Red Hat, Inc.
* Copyright (C) 2008 Virtual Iron Software, Inc.
* Copyright (C) 2008 David F. Lively
*
* 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, see
* <http://www.gnu.org/licenses/>.
*
* Author: David F. Lively <dlively@virtualiron.com>
*/
#include <config.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#include <sys/stat.h>
#include "virterror_internal.h"
#include "datatypes.h"
#include "memory.h"
#include "logging.h"
#include "node_device_conf.h"
#include "node_device_hal.h"
#include "node_device_driver.h"
#include "util.h"
#define VIR_FROM_THIS VIR_FROM_NODEDEV
static int update_caps(virNodeDeviceObjPtr dev)
{
virNodeDevCapsDefPtr cap = dev->def->caps;
while (cap) {
/* The only caps that currently need updating are FC related. */
if (cap->type == VIR_NODE_DEV_CAP_SCSI_HOST) {
check_fc_host(&dev->def->caps->data);
}
cap = cap->next;
}
return 0;
}
#if defined (__linux__) && defined (HAVE_HAL)
/* Under libudev changes to the driver name should be picked up as
* "change" events, so we don't call update driver name unless we're
* using the HAL backend. */
static int update_driver_name(virNodeDeviceObjPtr dev)
{
char *driver_link = NULL;
char *devpath = NULL;
char *p;
int ret = -1;
VIR_FREE(dev->def->driver);
if (virAsprintf(&driver_link, "%s/driver", dev->def->sysfs_path) < 0) {
virReportOOMError();
goto cleanup;
}
/* Some devices don't have an explicit driver, so just return
without a name */
if (access(driver_link, R_OK) < 0) {
ret = 0;
goto cleanup;
}
if (virFileResolveLink(driver_link, &devpath) < 0) {
virReportSystemError(errno,
_("cannot resolve driver link %s"), driver_link);
goto cleanup;
}
p = strrchr(devpath, '/');
if (p) {
dev->def->driver = strdup(p+1);
if (!dev->def->driver) {
virReportOOMError();
goto cleanup;
}
}
ret = 0;
cleanup:
VIR_FREE(driver_link);
VIR_FREE(devpath);
return ret;
}
#else
/* XXX: Implement me for non-linux */
static int update_driver_name(virNodeDeviceObjPtr dev ATTRIBUTE_UNUSED)
{
return 0;
}
#endif
void nodeDeviceLock(virDeviceMonitorStatePtr driver)
{
virMutexLock(&driver->lock);
}
void nodeDeviceUnlock(virDeviceMonitorStatePtr driver)
{
virMutexUnlock(&driver->lock);
}
int
nodeNumOfDevices(virConnectPtr conn,
const char *cap,
unsigned int flags)
{
virDeviceMonitorStatePtr driver = conn->devMonPrivateData;
int ndevs = 0;
unsigned int i;
virCheckFlags(0, -1);
nodeDeviceLock(driver);
for (i = 0; i < driver->devs.count; i++) {
virNodeDeviceObjLock(driver->devs.objs[i]);
if ((cap == NULL) ||
virNodeDeviceHasCap(driver->devs.objs[i], cap))
++ndevs;
virNodeDeviceObjUnlock(driver->devs.objs[i]);
}
nodeDeviceUnlock(driver);
return ndevs;
}
int
nodeListDevices(virConnectPtr conn,
const char *cap,
char **const names, int maxnames,
unsigned int flags)
{
virDeviceMonitorStatePtr driver = conn->devMonPrivateData;
int ndevs = 0;
unsigned int i;
virCheckFlags(0, -1);
nodeDeviceLock(driver);
for (i = 0; i < driver->devs.count && ndevs < maxnames; i++) {
virNodeDeviceObjLock(driver->devs.objs[i]);
if (cap == NULL ||
virNodeDeviceHasCap(driver->devs.objs[i], cap)) {
if ((names[ndevs++] = strdup(driver->devs.objs[i]->def->name)) == NULL) {
virNodeDeviceObjUnlock(driver->devs.objs[i]);
virReportOOMError();
goto failure;
}
}
virNodeDeviceObjUnlock(driver->devs.objs[i]);
}
nodeDeviceUnlock(driver);
return ndevs;
failure:
nodeDeviceUnlock(driver);
--ndevs;
while (--ndevs >= 0)
VIR_FREE(names[ndevs]);
return -1;
}
int
nodeListAllNodeDevices(virConnectPtr conn,
virNodeDevicePtr **devices,
unsigned int flags)
{
virDeviceMonitorStatePtr driver = conn->devMonPrivateData;
int ret = -1;
virCheckFlags(VIR_CONNECT_LIST_NODE_DEVICES_FILTERS_CAP, -1);
nodeDeviceLock(driver);
ret = virNodeDeviceList(conn, driver->devs, devices, flags);
nodeDeviceUnlock(driver);
return ret;
}
virNodeDevicePtr
nodeDeviceLookupByName(virConnectPtr conn, const char *name)
{
virDeviceMonitorStatePtr driver = conn->devMonPrivateData;
virNodeDeviceObjPtr obj;
virNodeDevicePtr ret = NULL;
nodeDeviceLock(driver);
obj = virNodeDeviceFindByName(&driver->devs, name);
nodeDeviceUnlock(driver);
if (!obj) {
virReportError(VIR_ERR_NO_NODE_DEVICE, NULL);
goto cleanup;
}
ret = virGetNodeDevice(conn, name);
cleanup:
if (obj)
virNodeDeviceObjUnlock(obj);
return ret;
}
static virNodeDevicePtr
nodeDeviceLookupByWWN(virConnectPtr conn,
const char *wwnn,
const char *wwpn)
{
unsigned int i;
virDeviceMonitorStatePtr driver = conn->devMonPrivateData;
virNodeDeviceObjListPtr devs = &driver->devs;
virNodeDevCapsDefPtr cap = NULL;
virNodeDeviceObjPtr obj = NULL;
virNodeDevicePtr dev = NULL;
nodeDeviceLock(driver);
for (i = 0; i < devs->count; i++) {
obj = devs->objs[i];
virNodeDeviceObjLock(obj);
cap = obj->def->caps;
while (cap) {
if (cap->type == VIR_NODE_DEV_CAP_SCSI_HOST) {
check_fc_host(&cap->data);
if (cap->data.scsi_host.flags &
VIR_NODE_DEV_CAP_FLAG_HBA_FC_HOST) {
if (STREQ(cap->data.scsi_host.wwnn, wwnn) &&
STREQ(cap->data.scsi_host.wwpn, wwpn)) {
dev = virGetNodeDevice(conn, obj->def->name);
virNodeDeviceObjUnlock(obj);
goto out;
}
}
}
cap = cap->next;
}
virNodeDeviceObjUnlock(obj);
}
out:
nodeDeviceUnlock(driver);
return dev;
}
char *
nodeDeviceGetXMLDesc(virNodeDevicePtr dev,
unsigned int flags)
{
virDeviceMonitorStatePtr driver = dev->conn->devMonPrivateData;
virNodeDeviceObjPtr obj;
char *ret = NULL;
virCheckFlags(0, NULL);
nodeDeviceLock(driver);
obj = virNodeDeviceFindByName(&driver->devs, dev->name);
nodeDeviceUnlock(driver);
if (!obj) {
virReportError(VIR_ERR_NO_NODE_DEVICE,
_("no node device with matching name '%s'"),
dev->name);
goto cleanup;
}
update_driver_name(obj);
update_caps(obj);
ret = virNodeDeviceDefFormat(obj->def);
cleanup:
if (obj)
virNodeDeviceObjUnlock(obj);
return ret;
}
char *
nodeDeviceGetParent(virNodeDevicePtr dev)
{
virDeviceMonitorStatePtr driver = dev->conn->devMonPrivateData;
virNodeDeviceObjPtr obj;
char *ret = NULL;
nodeDeviceLock(driver);
obj = virNodeDeviceFindByName(&driver->devs, dev->name);
nodeDeviceUnlock(driver);
if (!obj) {
virReportError(VIR_ERR_NO_NODE_DEVICE,
_("no node device with matching name '%s'"),
dev->name);
goto cleanup;
}
if (obj->def->parent) {
ret = strdup(obj->def->parent);
if (!ret)
virReportOOMError();
} else {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("no parent for this device"));
}
cleanup:
if (obj)
virNodeDeviceObjUnlock(obj);
return ret;
}
int
nodeDeviceNumOfCaps(virNodeDevicePtr dev)
{
virDeviceMonitorStatePtr driver = dev->conn->devMonPrivateData;
virNodeDeviceObjPtr obj;
virNodeDevCapsDefPtr caps;
int ncaps = 0;
int ret = -1;
nodeDeviceLock(driver);
obj = virNodeDeviceFindByName(&driver->devs, dev->name);
nodeDeviceUnlock(driver);
if (!obj) {
virReportError(VIR_ERR_NO_NODE_DEVICE,
_("no node device with matching name '%s'"),
dev->name);
goto cleanup;
}
for (caps = obj->def->caps; caps; caps = caps->next)
++ncaps;
ret = ncaps;
cleanup:
if (obj)
virNodeDeviceObjUnlock(obj);
return ret;
}
int
nodeDeviceListCaps(virNodeDevicePtr dev, char **const names, int maxnames)
{
virDeviceMonitorStatePtr driver = dev->conn->devMonPrivateData;
virNodeDeviceObjPtr obj;
virNodeDevCapsDefPtr caps;
int ncaps = 0;
int ret = -1;
nodeDeviceLock(driver);
obj = virNodeDeviceFindByName(&driver->devs, dev->name);
nodeDeviceUnlock(driver);
if (!obj) {
virReportError(VIR_ERR_NO_NODE_DEVICE,
_("no node device with matching name '%s'"),
dev->name);
goto cleanup;
}
for (caps = obj->def->caps; caps && ncaps < maxnames; caps = caps->next) {
names[ncaps] = strdup(virNodeDevCapTypeToString(caps->type));
if (names[ncaps++] == NULL) {
virReportOOMError();
goto cleanup;
}
}
ret = ncaps;
cleanup:
if (obj)
virNodeDeviceObjUnlock(obj);
if (ret == -1) {
--ncaps;
while (--ncaps >= 0)
VIR_FREE(names[ncaps]);
}
return ret;
}
static int
nodeDeviceVportCreateDelete(const int parent_host,
const char *wwpn,
const char *wwnn,
int operation)
{
int retval = 0;
char *operation_path = NULL, *vport_name = NULL;
const char *operation_file = NULL;
struct stat st;
switch (operation) {
case VPORT_CREATE:
operation_file = LINUX_SYSFS_VPORT_CREATE_POSTFIX;
break;
case VPORT_DELETE:
operation_file = LINUX_SYSFS_VPORT_DELETE_POSTFIX;
break;
default:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Invalid vport operation (%d)"), operation);
retval = -1;
goto cleanup;
break;
}
if (virAsprintf(&operation_path,
"%shost%d%s",
LINUX_SYSFS_FC_HOST_PREFIX,
parent_host,
operation_file) < 0) {
virReportOOMError();
retval = -1;
goto cleanup;
}
if (stat(operation_path, &st) != 0) {
VIR_FREE(operation_path);
if (virAsprintf(&operation_path,
"%shost%d%s",
LINUX_SYSFS_SCSI_HOST_PREFIX,
parent_host,
operation_file) < 0) {
virReportOOMError();
retval = -1;
goto cleanup;
}
if (stat(operation_path, &st) != 0) {
VIR_ERROR(_("No vport operation path found for host%d"),
parent_host);
retval = -1;
goto cleanup;
}
}
VIR_DEBUG("Vport operation path is '%s'", operation_path);
if (virAsprintf(&vport_name,
"%s:%s",
wwpn,
wwnn) < 0) {
virReportOOMError();
retval = -1;
goto cleanup;
}
if (virFileWriteStr(operation_path, vport_name, 0) == -1) {
virReportSystemError(errno,
_("Write of '%s' to '%s' during "
"vport create/delete failed"),
vport_name, operation_path);
retval = -1;
}
cleanup:
VIR_FREE(vport_name);
VIR_FREE(operation_path);
VIR_DEBUG("%s", _("Vport operation complete"));
return retval;
}
static int
get_time(time_t *t)
{
int ret = 0;
*t = time(NULL);
if (*t == (time_t)-1) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("Could not get current time"));
*t = 0;
ret = -1;
}
return ret;
}
/* When large numbers of devices are present on the host, it's
* possible for udev not to realize that it has work to do before we
* get here. We thus keep trying to find the new device we just
* created for up to LINUX_NEW_DEVICE_WAIT_TIME. Note that udev's
* default settle time is 180 seconds, so once udev realizes that it
* has work to do, it might take that long for the udev wait to
* return. Thus the total maximum time for this function to return is
* the udev settle time plus LINUX_NEW_DEVICE_WAIT_TIME.
*
* This whole area is a race, but if we retry the udev wait for
* LINUX_NEW_DEVICE_WAIT_TIME seconds and there's still no device,
* it's probably safe to assume it's not going to appear.
*/
static virNodeDevicePtr
find_new_device(virConnectPtr conn, const char *wwnn, const char *wwpn)
{
virDeviceMonitorStatePtr driver = conn->devMonPrivateData;
virNodeDevicePtr dev = NULL;
time_t start = 0, now = 0;
/* The thread that creates the device takes the driver lock, so we
* must release it in order to allow the device to be created.
* We're not doing anything with the driver pointer at this point,
* so it's safe to release it, assuming that the pointer itself
* doesn't become invalid. */
nodeDeviceUnlock(driver);
get_time(&start);
while ((now - start) < LINUX_NEW_DEVICE_WAIT_TIME) {
virFileWaitForDevices();
dev = nodeDeviceLookupByWWN(conn, wwnn, wwpn);
if (dev != NULL) {
break;
}
sleep(5);
if (get_time(&now) == -1) {
break;
}
}
nodeDeviceLock(driver);
return dev;
}
virNodeDevicePtr
nodeDeviceCreateXML(virConnectPtr conn,
const char *xmlDesc,
unsigned int flags)
{
virDeviceMonitorStatePtr driver = conn->devMonPrivateData;
virNodeDeviceDefPtr def = NULL;
char *wwnn = NULL, *wwpn = NULL;
int parent_host = -1;
virNodeDevicePtr dev = NULL;
const char *virt_type = NULL;
virCheckFlags(0, NULL);
virt_type = virConnectGetType(conn);
nodeDeviceLock(driver);
def = virNodeDeviceDefParseString(xmlDesc, CREATE_DEVICE, virt_type);
if (def == NULL) {
goto cleanup;
}
if (virNodeDeviceGetWWNs(def, &wwnn, &wwpn) == -1) {
goto cleanup;
}
if (virNodeDeviceGetParentHost(&driver->devs,
def->name,
def->parent,
&parent_host) == -1) {
goto cleanup;
}
if (nodeDeviceVportCreateDelete(parent_host,
wwpn,
wwnn,
VPORT_CREATE) == -1) {
goto cleanup;
}
dev = find_new_device(conn, wwnn, wwpn);
/* We don't check the return value, because one way or another,
* we're returning what we get... */
if (dev == NULL) {
virReportError(VIR_ERR_NO_NODE_DEVICE, NULL);
}
cleanup:
nodeDeviceUnlock(driver);
virNodeDeviceDefFree(def);
VIR_FREE(wwnn);
VIR_FREE(wwpn);
return dev;
}
int
nodeDeviceDestroy(virNodeDevicePtr dev)
{
int ret = -1;
virDeviceMonitorStatePtr driver = dev->conn->devMonPrivateData;
virNodeDeviceObjPtr obj = NULL;
char *parent_name = NULL, *wwnn = NULL, *wwpn = NULL;
int parent_host = -1;
nodeDeviceLock(driver);
obj = virNodeDeviceFindByName(&driver->devs, dev->name);
nodeDeviceUnlock(driver);
if (!obj) {
virReportError(VIR_ERR_NO_NODE_DEVICE, NULL);
goto out;
}
if (virNodeDeviceGetWWNs(obj->def, &wwnn, &wwpn) == -1) {
goto out;
}
parent_name = strdup(obj->def->parent);
/* virNodeDeviceGetParentHost will cause the device object's lock to be
* taken, so we have to dup the parent's name and drop the lock
* before calling it. We don't need the reference to the object
* any more once we have the parent's name. */
virNodeDeviceObjUnlock(obj);
obj = NULL;
if (parent_name == NULL) {
virReportOOMError();
goto out;
}
if (virNodeDeviceGetParentHost(&driver->devs,
dev->name,
parent_name,
&parent_host) == -1) {
goto out;
}
if (nodeDeviceVportCreateDelete(parent_host,
wwpn,
wwnn,
VPORT_DELETE) == -1) {
goto out;
}
ret = 0;
out:
if (obj)
virNodeDeviceObjUnlock(obj);
VIR_FREE(parent_name);
VIR_FREE(wwnn);
VIR_FREE(wwpn);
return ret;
}
int nodedevRegister(void) {
#if defined(HAVE_HAL) && defined(HAVE_UDEV)
/* Register only one of these two - they conflict */
if (udevNodeRegister() == -1)
return halNodeRegister();
return 0;
#else
# ifdef HAVE_HAL
return halNodeRegister();
# endif
# ifdef HAVE_UDEV
return udevNodeRegister();
# endif
#endif
}
|