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libvirt/src/xen/xs_internal.c
John Ferlan 2ca9c3cefe xs: Remove redundant validity checks, clean up function headers 
Arguments for driver entry points are checked in libvirt.c, so no need to
check again. Make function entry points consistent.
2013-02-11 09:48:51 -05:00

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/*
* xs_internal.c: access to Xen Store
*
* Copyright (C) 2006, 2009-2013 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, see
* <http://www.gnu.org/licenses/>.
*
* Daniel Veillard <veillard@redhat.com>
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <stdint.h>
#include <xen/dom0_ops.h>
#include <xen/version.h>
#if HAVE_XENSTORE_H
# include <xenstore.h>
#else
# include <xs.h>
#endif
#include "virerror.h"
#include "datatypes.h"
#include "driver.h"
#include "viralloc.h"
#include "virlog.h"
#include "viruuid.h"
#include "xen_driver.h"
#include "xs_internal.h"
#include "xen_hypervisor.h"
#define VIR_FROM_THIS VIR_FROM_XEN
static char *xenStoreDomainGetOSType(virDomainPtr domain);
static void xenStoreWatchEvent(int watch, int fd, int events, void *data);
static void xenStoreWatchListFree(xenStoreWatchListPtr list);
struct xenUnifiedDriver xenStoreDriver = {
.xenClose = xenStoreClose,
.xenDomainShutdown = xenStoreDomainShutdown,
.xenDomainReboot = xenStoreDomainReboot,
.xenDomainGetOSType = xenStoreDomainGetOSType,
.xenDomainGetMaxMemory = xenStoreDomainGetMaxMemory,
.xenDomainSetMemory = xenStoreDomainSetMemory,
.xenDomainGetInfo = xenStoreGetDomainInfo,
};
/************************************************************************
* *
* Helper internal APIs *
* *
************************************************************************/
/**
* virConnectDoStoreList:
* @conn: pointer to the hypervisor connection
* @path: the absolute path of the directory in the store to list
* @nb: OUT pointer to the number of items found
*
* Internal API querying the Xenstore for a list
*
* Returns a string which must be freed by the caller or NULL in case of error
*/
static char **
virConnectDoStoreList(virConnectPtr conn, const char *path, unsigned int *nb)
{
xenUnifiedPrivatePtr priv = conn->privateData;
return xs_directory(priv->xshandle, 0, path, nb);
}
/**
* virDomainDoStoreQuery:
* @conn: pointer to the hypervisor connection
* @domid: id of the domain
* @path: the relative path of the data in the store to retrieve
*
* Internal API querying the Xenstore for a string value.
*
* Returns a string which must be freed by the caller or NULL in case of error
*/
static char *
virDomainDoStoreQuery(virConnectPtr conn, int domid, const char *path)
{
char s[256];
unsigned int len = 0;
xenUnifiedPrivatePtr priv = conn->privateData;
if (priv->xshandle == NULL)
return NULL;
snprintf(s, 255, "/local/domain/%d/%s", domid, path);
s[255] = 0;
return xs_read(priv->xshandle, 0, &s[0], &len);
}
/**
* virDomainDoStoreWrite:
* @domain: a domain object
* @path: the relative path of the data in the store to retrieve
*
* Internal API setting up a string value in the Xenstore
* Requires write access to the XenStore
*
* Returns 0 in case of success, -1 in case of failure
*/
static int
virDomainDoStoreWrite(virDomainPtr domain, const char *path, const char *value)
{
char s[256];
xenUnifiedPrivatePtr priv = domain->conn->privateData;
int ret = -1;
if (priv->xshandle == NULL || domain->conn->flags & VIR_CONNECT_RO)
return -1;
snprintf(s, 255, "/local/domain/%d/%s", domain->id, path);
s[255] = 0;
if (xs_write(priv->xshandle, 0, &s[0], value, strlen(value)))
ret = 0;
return ret;
}
/**
* virDomainGetVM:
* @domain: a domain object
*
* Internal API extracting a xenstore vm path.
*
* Returns the new string or NULL in case of error
*/
static char *
virDomainGetVM(virDomainPtr domain)
{
char *vm;
char query[200];
unsigned int len;
xenUnifiedPrivatePtr priv = domain->conn->privateData;
if (priv->xshandle == NULL)
return NULL;
snprintf(query, 199, "/local/domain/%d/vm", virDomainGetID(domain));
query[199] = 0;
vm = xs_read(priv->xshandle, 0, &query[0], &len);
return vm;
}
/**
* virDomainGetVMInfo:
* @domain: a domain object
* @vm: the xenstore vm path
* @name: the value's path
*
* Internal API extracting one information the device used
* by the domain from xensttore
*
* Returns the new string or NULL in case of error
*/
static char *
virDomainGetVMInfo(virDomainPtr domain, const char *vm, const char *name)
{
char s[256];
char *ret = NULL;
unsigned int len = 0;
xenUnifiedPrivatePtr priv = domain->conn->privateData;
if (priv->xshandle == NULL)
return NULL;
snprintf(s, 255, "%s/%s", vm, name);
s[255] = 0;
ret = xs_read(priv->xshandle, 0, &s[0], &len);
return ret;
}
/************************************************************************
* *
* Canonical internal APIs *
* *
************************************************************************/
/**
* xenStoreOpen:
* @conn: pointer to the connection block
* @name: URL for the target, NULL for local
* @flags: combination of virDrvOpenFlag(s)
*
* Connects to the Xen hypervisor.
*
* Returns 0 or -1 in case of error.
*/
virDrvOpenStatus
xenStoreOpen(virConnectPtr conn,
virConnectAuthPtr auth ATTRIBUTE_UNUSED,
unsigned int flags)
{
xenUnifiedPrivatePtr priv = conn->privateData;
virCheckFlags(VIR_CONNECT_RO, VIR_DRV_OPEN_ERROR);
if (flags & VIR_CONNECT_RO)
priv->xshandle = xs_daemon_open_readonly();
else
priv->xshandle = xs_daemon_open();
if (priv->xshandle == NULL) {
/*
* not being able to connect via the socket as an unprivileged
* user is rather normal, this should fallback to the proxy (or
* remote) mechanism.
*/
if (xenHavePrivilege()) {
virReportError(VIR_ERR_NO_XEN,
"%s", _("failed to connect to Xen Store"));
}
return -1;
}
/* Init activeDomainList */
if (VIR_ALLOC(priv->activeDomainList) < 0) {
virReportOOMError();
return -1;
}
/* Init watch list before filling in domInfoList,
so we can know if it is the first time through
when the callback fires */
if (VIR_ALLOC(priv->xsWatchList) < 0) {
virReportOOMError();
return -1;
}
/* This will get called once at start */
if (xenStoreAddWatch(conn, "@releaseDomain",
"releaseDomain", xenStoreDomainReleased, priv) < 0)
{
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("adding watch @releaseDomain"));
return -1;
}
/* The initial call of this will fill domInfoList */
if (xenStoreAddWatch(conn, "@introduceDomain",
"introduceDomain", xenStoreDomainIntroduced, priv) < 0)
{
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("adding watch @introduceDomain"));
return -1;
}
/* Add an event handle */
if ((priv->xsWatch = virEventAddHandle(xs_fileno(priv->xshandle),
VIR_EVENT_HANDLE_READABLE,
xenStoreWatchEvent,
conn,
NULL)) < 0)
VIR_DEBUG("Failed to add event handle, disabling events");
return 0;
}
/**
* xenStoreClose:
* @conn: pointer to the connection block
*
* Close the connection to the Xen hypervisor.
*
* Returns 0 in case of success or -1 in case of error.
*/
int
xenStoreClose(virConnectPtr conn)
{
xenUnifiedPrivatePtr priv = conn->privateData;
if (xenStoreRemoveWatch(conn, "@introduceDomain", "introduceDomain") < 0) {
VIR_DEBUG("Warning, could not remove @introduceDomain watch");
/* not fatal */
}
if (xenStoreRemoveWatch(conn, "@releaseDomain", "releaseDomain") < 0) {
VIR_DEBUG("Warning, could not remove @releaseDomain watch");
/* not fatal */
}
xenStoreWatchListFree(priv->xsWatchList);
priv->xsWatchList = NULL;
xenUnifiedDomainInfoListFree(priv->activeDomainList);
priv->activeDomainList = NULL;
if (priv->xshandle == NULL)
return -1;
if (priv->xsWatch != -1)
virEventRemoveHandle(priv->xsWatch);
xs_daemon_close(priv->xshandle);
priv->xshandle = NULL;
return 0;
}
/**
* xenStoreGetDomainInfo:
* @domain: pointer to the domain block
* @info: the place where information should be stored
*
* Do a hypervisor call to get the related set of domain information.
*
* Returns 0 in case of success, -1 in case of error.
*/
int
xenStoreGetDomainInfo(virDomainPtr domain, virDomainInfoPtr info)
{
char *tmp, **tmp2;
unsigned int nb_vcpus;
char request[200];
xenUnifiedPrivatePtr priv = domain->conn->privateData;
if (priv->xshandle == NULL || domain->id == -1)
return -1;
tmp = virDomainDoStoreQuery(domain->conn, domain->id, "running");
if (tmp != NULL) {
if (tmp[0] == '1')
info->state = VIR_DOMAIN_RUNNING;
VIR_FREE(tmp);
} else {
info->state = VIR_DOMAIN_NOSTATE;
}
tmp = virDomainDoStoreQuery(domain->conn, domain->id, "memory/target");
if (tmp != NULL) {
info->memory = atol(tmp);
info->maxMem = atol(tmp);
VIR_FREE(tmp);
} else {
info->memory = 0;
info->maxMem = 0;
}
#if 0
/* doesn't seems to work */
tmp = virDomainDoStoreQuery(domain->conn, domain->id, "cpu_time");
if (tmp != NULL) {
info->cpuTime = atol(tmp);
VIR_FREE(tmp);
} else {
info->cpuTime = 0;
}
#endif
snprintf(request, 199, "/local/domain/%d/cpu", domain->id);
request[199] = 0;
tmp2 = virConnectDoStoreList(domain->conn, request, &nb_vcpus);
if (tmp2 != NULL) {
info->nrVirtCpu = nb_vcpus;
VIR_FREE(tmp2);
}
return 0;
}
/**
* xenStoreDomainGetState:
* @domain: pointer to the domain block
* @state: returned domain's state
* @reason: returned state reason
* @flags: additional flags, 0 for now
*
* Returns 0 in case of success, -1 in case of error.
*/
int
xenStoreDomainGetState(virDomainPtr domain,
int *state,
int *reason,
unsigned int flags)
{
char *running;
virCheckFlags(0, -1);
if (domain->id == -1)
return -1;
running = virDomainDoStoreQuery(domain->conn, domain->id, "running");
if (running && *running == '1')
*state = VIR_DOMAIN_RUNNING;
else
*state = VIR_DOMAIN_NOSTATE;
if (reason)
*reason = 0;
VIR_FREE(running);
return 0;
}
/**
* xenStoreDomainSetMemory:
* @domain: pointer to the domain block
* @memory: the max memory size in kilobytes.
*
* Change the maximum amount of memory allowed in the xen store
*
* Returns 0 in case of success, -1 in case of error.
*/
int
xenStoreDomainSetMemory(virDomainPtr domain, unsigned long memory)
{
int ret;
char value[20];
if (memory < 1024 * MIN_XEN_GUEST_SIZE) {
virReportError(VIR_ERR_INVALID_ARG, __FUNCTION__);
return -1;
}
if (domain->id == -1)
return -1;
if ((domain->id == 0) && (memory < (2 * MIN_XEN_GUEST_SIZE * 1024)))
return -1;
snprintf(value, 19, "%lu", memory);
value[19] = 0;
ret = virDomainDoStoreWrite(domain, "memory/target", &value[0]);
if (ret < 0)
return -1;
return 0;
}
/**
* xenStoreDomainGetMaxMemory:
* @domain: pointer to the domain block
*
* Ask the xenstore for the maximum memory allowed for a domain
*
* Returns the memory size in kilobytes or 0 in case of error.
*/
unsigned long long
xenStoreDomainGetMaxMemory(virDomainPtr domain)
{
char *tmp;
unsigned long long ret = 0;
xenUnifiedPrivatePtr priv = domain->conn->privateData;
if (domain->id == -1)
return 0;
xenUnifiedLock(priv);
tmp = virDomainDoStoreQuery(domain->conn, domain->id, "memory/target");
if (tmp != NULL) {
ret = atol(tmp);
VIR_FREE(tmp);
}
xenUnifiedUnlock(priv);
return ret;
}
/**
* xenStoreNumOfDomains:
* @conn: pointer to the hypervisor connection
*
* Provides the number of active domains.
*
* Returns the number of domain found or -1 in case of error
*/
int
xenStoreNumOfDomains(virConnectPtr conn)
{
unsigned int num;
char **idlist = NULL, *endptr;
int i, ret = -1, realnum = 0;
long id;
xenUnifiedPrivatePtr priv = conn->privateData;
if (priv->xshandle == NULL) {
virReportError(VIR_ERR_INVALID_ARG, __FUNCTION__);
return -1;
}
idlist = xs_directory(priv->xshandle, 0, "/local/domain", &num);
if (idlist) {
for (i = 0; i < num; i++) {
id = strtol(idlist[i], &endptr, 10);
if ((endptr == idlist[i]) || (*endptr != 0))
goto out;
/* Sometimes xenstore has stale domain IDs, so filter
against the hypervisor's info */
if (xenHypervisorHasDomain(conn, (int)id))
realnum++;
}
out:
VIR_FREE(idlist);
ret = realnum;
}
return ret;
}
/**
* xenStoreDoListDomains:
* @conn: pointer to the hypervisor connection
* @ids: array to collect the list of IDs of active domains
* @maxids: size of @ids
*
* Internal API: collect the list of active domains, and store
* their ID in @maxids. The driver lock must be held.
*
* Returns the number of domain found or -1 in case of error
*/
static int
xenStoreDoListDomains(virConnectPtr conn,
xenUnifiedPrivatePtr priv,
int *ids,
int maxids)
{
char **idlist = NULL, *endptr;
unsigned int num, i;
int ret = -1;
long id;
if (priv->xshandle == NULL)
goto out;
idlist = xs_directory(priv->xshandle, 0, "/local/domain", &num);
if (idlist == NULL)
goto out;
for (ret = 0, i = 0; (i < num) && (ret < maxids); i++) {
id = strtol(idlist[i], &endptr, 10);
if ((endptr == idlist[i]) || (*endptr != 0))
goto out;
/* Sometimes xenstore has stale domain IDs, so filter
against the hypervisor's info */
if (xenHypervisorHasDomain(conn, (int)id))
ids[ret++] = (int) id;
}
out:
VIR_FREE(idlist);
return ret;
}
/**
* xenStoreListDomains:
* @conn: pointer to the hypervisor connection
* @ids: array to collect the list of IDs of active domains
* @maxids: size of @ids
*
* Collect the list of active domains, and store their ID in @maxids
*
* Returns the number of domain found or -1 in case of error
*/
int
xenStoreListDomains(virConnectPtr conn, int *ids, int maxids)
{
xenUnifiedPrivatePtr priv = conn->privateData;
int ret;
xenUnifiedLock(priv);
ret = xenStoreDoListDomains(conn, priv, ids, maxids);
xenUnifiedUnlock(priv);
return ret;
}
/**
* xenStoreLookupByName:
* @conn: A xend instance
* @name: The name of the domain
*
* Try to lookup a domain on the Xen Store based on its name.
*
* Returns a new domain object or NULL in case of failure
*/
virDomainPtr
xenStoreLookupByName(virConnectPtr conn, const char *name)
{
virDomainPtr ret = NULL;
unsigned int num, i, len;
long id = -1;
char **idlist = NULL, *endptr;
char prop[200], *tmp;
int found = 0;
struct xend_domain *xenddomain = NULL;
xenUnifiedPrivatePtr priv = conn->privateData;
if (priv->xshandle == NULL)
return NULL;
idlist = xs_directory(priv->xshandle, 0, "/local/domain", &num);
if (idlist == NULL)
goto done;
for (i = 0; i < num; i++) {
id = strtol(idlist[i], &endptr, 10);
if ((endptr == idlist[i]) || (*endptr != 0)) {
goto done;
}
#if 0
if (virConnectCheckStoreID(conn, (int) id) < 0)
continue;
#endif
snprintf(prop, 199, "/local/domain/%s/name", idlist[i]);
prop[199] = 0;
tmp = xs_read(priv->xshandle, 0, prop, &len);
if (tmp != NULL) {
found = STREQ(name, tmp);
VIR_FREE(tmp);
if (found)
break;
}
}
if (!found)
goto done;
ret = virGetDomain(conn, name, NULL);
if (ret == NULL)
goto done;
ret->id = id;
done:
VIR_FREE(xenddomain);
VIR_FREE(idlist);
return ret;
}
/**
* xenStoreDomainShutdown:
* @domain: pointer to the Domain block
*
* Shutdown the domain, the OS is requested to properly shutdown
* and the domain may ignore it. It will return immediately
* after queuing the request.
*
* Returns 0 in case of success, -1 in case of error.
*/
int
xenStoreDomainShutdown(virDomainPtr domain)
{
int ret;
xenUnifiedPrivatePtr priv = domain->conn->privateData;
if (domain->id == -1 || domain->id == 0)
return -1;
/*
* this is very hackish, the domU kernel probes for a special
* node in the xenstore and launch the shutdown command if found.
*/
xenUnifiedLock(priv);
ret = virDomainDoStoreWrite(domain, "control/shutdown", "poweroff");
xenUnifiedUnlock(priv);
return ret;
}
/**
* xenStoreDomainReboot:
* @domain: pointer to the Domain block
* @flags: extra flags for the reboot operation, not used yet
*
* Reboot the domain, the OS is requested to properly shutdown
* and reboot but the domain may ignore it. It will return immediately
* after queuing the request.
*
* Returns 0 in case of success, -1 in case of error.
*/
int
xenStoreDomainReboot(virDomainPtr domain, unsigned int flags)
{
int ret;
xenUnifiedPrivatePtr priv = domain->conn->privateData;
virCheckFlags(0, -1);
if (domain->id == -1 || domain->id == 0)
return -1;
/*
* this is very hackish, the domU kernel probes for a special
* node in the xenstore and launch the shutdown command if found.
*/
xenUnifiedLock(priv);
ret = virDomainDoStoreWrite(domain, "control/shutdown", "reboot");
xenUnifiedUnlock(priv);
return ret;
}
/*
* xenStoreDomainGetOSType:
* @domain: a domain object
*
* Get the type of domain operation system.
*
* Returns the new string or NULL in case of error, the string must be
* freed by the caller.
*/
static char *
xenStoreDomainGetOSType(virDomainPtr domain)
{
char *vm, *str = NULL;
vm = virDomainGetVM(domain);
if (vm) {
xenUnifiedPrivatePtr priv = domain->conn->privateData;
xenUnifiedLock(priv);
str = virDomainGetVMInfo(domain, vm, "image/ostype");
xenUnifiedUnlock(priv);
VIR_FREE(vm);
}
return str;
}
/**
* xenStoreDomainGetVNCPort:
* @conn: the hypervisor connection
* @domid: id of the domain
*
* Return the port number on which the domain is listening for VNC
* connections.
*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*
* Returns the port number, -1 in case of error
*/
int
xenStoreDomainGetVNCPort(virConnectPtr conn, int domid)
{
char *tmp;
int ret = -1;
tmp = virDomainDoStoreQuery(conn, domid, "console/vnc-port");
if (tmp != NULL) {
char *end;
ret = strtol(tmp, &end, 10);
if (ret == 0 && end == tmp)
ret = -1;
VIR_FREE(tmp);
}
return ret;
}
/**
* xenStoreDomainGetConsolePath:
* @conn: the hypervisor connection
* @domid: id of the domain
*
* Return the path to the pseudo TTY on which the guest domain's
* serial console is attached.
*
* Returns the path to the serial console. It is the callers
* responsibilty to free() the return string. Returns NULL
* on error
*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*/
char *
xenStoreDomainGetConsolePath(virConnectPtr conn, int domid)
{
return virDomainDoStoreQuery(conn, domid, "console/tty");
}
/**
* xenStoreDomainGetSerailConsolePath:
* @conn: the hypervisor connection
* @domid: id of the domain
*
* Return the path to the pseudo TTY on which the guest domain's
* serial console is attached.
*
* Returns the path to the serial console. It is the callers
* responsibilty to free() the return string. Returns NULL
* on error
*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*/
char *
xenStoreDomainGetSerialConsolePath(virConnectPtr conn, int domid)
{
return virDomainDoStoreQuery(conn, domid, "serial/0/tty");
}
/*
* xenStoreDomainGetNetworkID:
* @conn: pointer to the connection.
* @id: the domain id
* @mac: the mac address
*
* Get the reference (i.e. the string number) for the device on that domain
* which uses the given mac address
*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*
* Returns the new string or NULL in case of error, the string must be
* freed by the caller.
*/
char *
xenStoreDomainGetNetworkID(virConnectPtr conn, int id, const char *mac)
{
char dir[80], path[128], **list = NULL, *val = NULL;
unsigned int len, i, num;
char *ret = NULL;
xenUnifiedPrivatePtr priv = conn->privateData;
if (id < 0 || priv->xshandle == NULL || mac == NULL)
return NULL;
snprintf(dir, sizeof(dir), "/local/domain/0/backend/vif/%d", id);
list = xs_directory(priv->xshandle, 0, dir, &num);
if (list == NULL)
return NULL;
for (i = 0; i < num; i++) {
snprintf(path, sizeof(path), "%s/%s/%s", dir, list[i], "mac");
if ((val = xs_read(priv->xshandle, 0, path, &len)) == NULL)
break;
bool match = (virMacAddrCompare(val, mac) == 0);
VIR_FREE(val);
if (match) {
ret = strdup(list[i]);
if (ret == NULL)
virReportOOMError();
break;
}
}
VIR_FREE(list);
return ret;
}
/*
* xenStoreDomainGetDiskID:
* @conn: pointer to the connection.
* @id: the domain id
* @dev: the virtual block device name
*
* Get the reference (i.e. the string number) for the device on that domain
* which uses the given virtual block device name
*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*
* Returns the new string or NULL in case of error, the string must be
* freed by the caller.
*/
char *
xenStoreDomainGetDiskID(virConnectPtr conn, int id, const char *dev)
{
char dir[80], path[128], **list = NULL, *val = NULL;
unsigned int devlen, len, i, num;
char *ret = NULL;
xenUnifiedPrivatePtr priv = conn->privateData;
if (id < 0 || priv->xshandle == NULL || dev == NULL)
return NULL;
devlen = strlen(dev);
if (devlen <= 0)
return NULL;
snprintf(dir, sizeof(dir), "/local/domain/0/backend/vbd/%d", id);
list = xs_directory(priv->xshandle, 0, dir, &num);
if (list != NULL) {
for (i = 0; i < num; i++) {
snprintf(path, sizeof(path), "%s/%s/%s", dir, list[i], "dev");
val = xs_read(priv->xshandle, 0, path, &len);
if (val == NULL)
break;
if ((devlen != len) || memcmp(val, dev, len)) {
VIR_FREE(val);
} else {
ret = strdup(list[i]);
if (ret == NULL)
virReportOOMError();
VIR_FREE(val);
VIR_FREE(list);
return ret;
}
}
VIR_FREE(list);
}
snprintf(dir, sizeof(dir), "/local/domain/0/backend/tap/%d", id);
list = xs_directory(priv->xshandle, 0, dir, &num);
if (list != NULL) {
for (i = 0; i < num; i++) {
snprintf(path, sizeof(path), "%s/%s/%s", dir, list[i], "dev");
val = xs_read(priv->xshandle, 0, path, &len);
if (val == NULL)
break;
if ((devlen != len) || memcmp(val, dev, len)) {
VIR_FREE(val);
} else {
ret = strdup(list[i]);
if (ret == NULL)
virReportOOMError();
VIR_FREE(val);
VIR_FREE(list);
return ret;
}
}
VIR_FREE(list);
}
return NULL;
}
/*
* xenStoreDomainGetPCIID:
* @conn: pointer to the connection.
* @id: the domain id
* @bdf: the PCI BDF
*
* Get the reference (i.e. the string number) for the device on that domain
* which uses the given PCI address
*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*
* Returns the new string or NULL in case of error, the string must be
* freed by the caller.
*/
char *
xenStoreDomainGetPCIID(virConnectPtr conn, int id, const char *bdf)
{
char dir[80], path[128], **list = NULL, *val = NULL;
unsigned int len, i, num;
char *ret = NULL;
xenUnifiedPrivatePtr priv = conn->privateData;
if (id < 0 || priv->xshandle == NULL || bdf == NULL)
return NULL;
snprintf(dir, sizeof(dir), "/local/domain/0/backend/pci/%d", id);
list = xs_directory(priv->xshandle, 0, dir, &num);
if (list == NULL)
return NULL;
for (i = 0; i < num; i++) {
snprintf(path, sizeof(path), "%s/%s/%s", dir, list[i], "dev-0");
if ((val = xs_read(priv->xshandle, 0, path, &len)) == NULL)
break;
bool match = STREQ(val, bdf);
VIR_FREE(val);
if (match) {
ret = strdup(list[i]);
break;
}
}
VIR_FREE(list);
return ret;
}
/*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*/
char *
xenStoreDomainGetName(virConnectPtr conn, int id)
{
char prop[200];
xenUnifiedPrivatePtr priv = conn->privateData;
unsigned int len;
if (priv->xshandle == NULL)
return NULL;
snprintf(prop, 199, "/local/domain/%d/name", id);
prop[199] = 0;
return xs_read(priv->xshandle, 0, prop, &len);
}
/*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*/
int
xenStoreDomainGetUUID(virConnectPtr conn, int id, unsigned char *uuid)
{
char prop[200];
xenUnifiedPrivatePtr priv = conn->privateData;
unsigned int len;
char *uuidstr;
int ret = 0;
if (priv->xshandle == NULL)
return -1;
snprintf(prop, 199, "/local/domain/%d/vm", id);
prop[199] = 0;
/* This will return something like
* /vm/00000000-0000-0000-0000-000000000000[-*] */
uuidstr = xs_read(priv->xshandle, 0, prop, &len);
/* Strip optional version suffix when VM was renamed */
if (len > 40) /* strlen('/vm/') + VIR_UUID_STRING_BUFLEN - sizeof('\0') */
uuidstr[40] = '\0';
/* remove "/vm/" */
ret = virUUIDParse(uuidstr + 4, uuid);
VIR_FREE(uuidstr);
return ret;
}
static void
xenStoreWatchListFree(xenStoreWatchListPtr list)
{
int i;
for (i=0; i<list->count; i++) {
VIR_FREE(list->watches[i]->path);
VIR_FREE(list->watches[i]->token);
VIR_FREE(list->watches[i]);
}
VIR_FREE(list);
}
/*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*/
int
xenStoreAddWatch(virConnectPtr conn,
const char *path,
const char *token,
xenStoreWatchCallback cb,
void *opaque)
{
xenStoreWatchPtr watch = NULL;
int n;
xenStoreWatchListPtr list;
xenUnifiedPrivatePtr priv = conn->privateData;
if (priv->xshandle == NULL)
return -1;
list = priv->xsWatchList;
if (!list)
return -1;
/* check if we already have this callback on our list */
for (n=0; n < list->count; n++) {
if (STREQ(list->watches[n]->path, path) &&
STREQ(list->watches[n]->token, token)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("watch already tracked"));
return -1;
}
}
if (VIR_ALLOC(watch) < 0)
goto no_memory;
watch->path = strdup(path);
watch->token = strdup(token);
watch->cb = cb;
watch->opaque = opaque;
if (watch->path == NULL || watch->token == NULL) {
goto no_memory;
}
/* Make space on list */
n = list->count;
if (VIR_REALLOC_N(list->watches, n + 1) < 0) {
goto no_memory;
}
list->watches[n] = watch;
list->count++;
return xs_watch(priv->xshandle, watch->path, watch->token);
no_memory:
if (watch) {
VIR_FREE(watch->path);
VIR_FREE(watch->token);
VIR_FREE(watch);
}
virReportOOMError();
return -1;
}
/*
* The caller must hold the lock on the privateData
* associated with the 'conn' parameter.
*/
int
xenStoreRemoveWatch(virConnectPtr conn, const char *path, const char *token)
{
int i;
xenStoreWatchListPtr list;
xenUnifiedPrivatePtr priv = conn->privateData;
if (priv->xshandle == NULL)
return -1;
list = priv->xsWatchList;
if (!list)
return -1;
for (i = 0 ; i < list->count ; i++) {
if (STREQ(list->watches[i]->path, path) &&
STREQ(list->watches[i]->token, token)) {
if (!xs_unwatch(priv->xshandle,
list->watches[i]->path,
list->watches[i]->token))
{
VIR_DEBUG("WARNING: Could not remove watch");
/* Not fatal, continue */
}
VIR_FREE(list->watches[i]->path);
VIR_FREE(list->watches[i]->token);
VIR_FREE(list->watches[i]);
if (i < (list->count - 1))
memmove(list->watches + i,
list->watches + i + 1,
sizeof(*(list->watches)) *
(list->count - (i + 1)));
if (VIR_REALLOC_N(list->watches,
list->count - 1) < 0) {
; /* Failure to reduce memory allocation isn't fatal */
}
list->count--;
return 0;
}
}
return -1;
}
static xenStoreWatchPtr
xenStoreFindWatch(xenStoreWatchListPtr list,
const char *path,
const char *token)
{
int i;
for (i = 0 ; i < list->count ; i++)
if (STREQ(path, list->watches[i]->path) &&
STREQ(token, list->watches[i]->token))
return list->watches[i];
return NULL;
}
static void
xenStoreWatchEvent(int watch ATTRIBUTE_UNUSED,
int fd ATTRIBUTE_UNUSED,
int events, void *data)
{
char **event;
char *path;
char *token;
unsigned int stringCount;
xenStoreWatchPtr sw;
virConnectPtr conn = data;
xenUnifiedPrivatePtr priv = conn->privateData;
if (!priv) return;
/* only set a watch on read and write events */
if (events & (VIR_EVENT_HANDLE_ERROR | VIR_EVENT_HANDLE_HANGUP)) return;
xenUnifiedLock(priv);
if (!priv->xshandle)
goto cleanup;
event = xs_read_watch(priv->xshandle, &stringCount);
if (!event)
goto cleanup;
path = event[XS_WATCH_PATH];
token = event[XS_WATCH_TOKEN];
sw = xenStoreFindWatch(priv->xsWatchList, path, token);
if (sw)
sw->cb(conn, path, token, sw->opaque);
VIR_FREE(event);
cleanup:
xenUnifiedUnlock(priv);
}
/*
* The domain callback for the @introduceDomain watch
*
* The lock on 'priv' is held when calling this
*/
int
xenStoreDomainIntroduced(virConnectPtr conn,
const char *path ATTRIBUTE_UNUSED,
const char *token ATTRIBUTE_UNUSED,
void *opaque)
{
int i, j, found, missing = 0, retries = 20;
int new_domain_cnt;
int *new_domids;
int nread;
xenUnifiedPrivatePtr priv = opaque;
retry:
new_domain_cnt = xenStoreNumOfDomains(conn);
if (new_domain_cnt < 0)
return -1;
if (VIR_ALLOC_N(new_domids,new_domain_cnt) < 0) {
virReportOOMError();
return -1;
}
nread = xenStoreDoListDomains(conn, priv, new_domids, new_domain_cnt);
if (nread != new_domain_cnt) {
/* mismatch. retry this read */
VIR_FREE(new_domids);
goto retry;
}
missing = 0;
for (i=0 ; i < new_domain_cnt ; i++) {
found = 0;
for (j = 0 ; j < priv->activeDomainList->count ; j++) {
if (priv->activeDomainList->doms[j]->id == new_domids[i]) {
found = 1;
break;
}
}
if (!found) {
virDomainEventPtr event;
char *name;
unsigned char uuid[VIR_UUID_BUFLEN];
if (!(name = xenStoreDomainGetName(conn, new_domids[i]))) {
missing = 1;
continue;
}
if (xenStoreDomainGetUUID(conn, new_domids[i], uuid) < 0) {
missing = 1;
VIR_FREE(name);
continue;
}
event = virDomainEventNew(new_domids[i], name, uuid,
VIR_DOMAIN_EVENT_STARTED,
VIR_DOMAIN_EVENT_STARTED_BOOTED);
if (event)
xenUnifiedDomainEventDispatch(priv, event);
/* Add to the list */
xenUnifiedAddDomainInfo(priv->activeDomainList,
new_domids[i], name, uuid);
VIR_FREE(name);
}
}
VIR_FREE(new_domids);
if (missing && retries--) {
VIR_DEBUG("Some domains were missing, trying again");
usleep(100 * 1000);
goto retry;
}
return 0;
}
/*
* The domain callback for the @destroyDomain watch
*
* The lock on 'priv' is held when calling this
*/
int
xenStoreDomainReleased(virConnectPtr conn,
const char *path ATTRIBUTE_UNUSED,
const char *token ATTRIBUTE_UNUSED,
void *opaque)
{
int i, j, found, removed, retries = 20;
int new_domain_cnt;
int *new_domids;
int nread;
xenUnifiedPrivatePtr priv = opaque;
if (!priv->activeDomainList->count) return 0;
retry:
new_domain_cnt = xenStoreNumOfDomains(conn);
if (new_domain_cnt < 0)
return -1;
if (VIR_ALLOC_N(new_domids,new_domain_cnt) < 0) {
virReportOOMError();
return -1;
}
nread = xenStoreDoListDomains(conn, priv, new_domids, new_domain_cnt);
if (nread != new_domain_cnt) {
/* mismatch. retry this read */
VIR_FREE(new_domids);
goto retry;
}
removed = 0;
for (j=0 ; j < priv->activeDomainList->count ; j++) {
found = 0;
for (i=0 ; i < new_domain_cnt ; i++) {
if (priv->activeDomainList->doms[j]->id == new_domids[i]) {
found = 1;
break;
}
}
if (!found) {
virDomainEventPtr event =
virDomainEventNew(-1,
priv->activeDomainList->doms[j]->name,
priv->activeDomainList->doms[j]->uuid,
VIR_DOMAIN_EVENT_STOPPED,
VIR_DOMAIN_EVENT_STOPPED_SHUTDOWN);
if (event)
xenUnifiedDomainEventDispatch(priv, event);
/* Remove from the list */
xenUnifiedRemoveDomainInfo(priv->activeDomainList,
priv->activeDomainList->doms[j]->id,
priv->activeDomainList->doms[j]->name,
priv->activeDomainList->doms[j]->uuid);
removed = 1;
}
}
VIR_FREE(new_domids);
if (!removed && retries--) {
VIR_DEBUG("No domains removed, retrying");
usleep(100 * 1000);
goto retry;
}
return 0;
}
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