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network: utility functions for updating network config

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These new functions are highly inspired by those in domain_conf.c (but
not identical), and are intended to make it simpler to update the
various combinations of live/persistent network configs.

The network driver wasn't previously as careful about the separation
between the live "status" in network->def and the persistent "config"
in network->newDef (or sometimes in network->def). This series
attempts to remedy some of that, but probably doesn't go all the way
(enough to get these functions working and enable continued work on
virNetworkUpdate though).

bridge_driver.c and test_driver.c were updated in a few places to take
advantage of the new functions and/or account for changes in argument
lists.
This commit is contained in:
Laine Stump 2012-09-14 11:35:35 -04:00
parent 7a99b0abaf
commit f36309d688
5 changed files with 264 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

238
src/conf/network_conf.c
View File

@ -228,20 +228,74 @@ void virNetworkObjListFree(virNetworkObjListPtr nets)
nets->count = 0;
}
virNetworkObjPtr virNetworkAssignDef(virNetworkObjListPtr nets,
const virNetworkDefPtr def)
/*
* virNetworkObjAssignDef:
* @network: the network object to update
* @def: the new NetworkDef (will be consumed by this function iff successful)
* @live: is this new def the "live" version, or the "persistent" version
*
* Replace the appropriate copy of the given network's NetworkDef
* with def. Use "live" and current state of the network to determine
* which to replace.
*
* Returns 0 on success, -1 on failure.
*/
int
virNetworkObjAssignDef(virNetworkObjPtr network,
const virNetworkDefPtr def,
bool live)
{
if (virNetworkObjIsActive(network)) {
if (live) {
virNetworkDefFree(network->def);
network->def = def;
} else if (network->persistent) {
/* save current configuration to be restored on network shutdown */
virNetworkDefFree(network->newDef);
network->newDef = def;
} else {
virReportError(VIR_ERR_OPERATION_INVALID,
_("cannot save persistent config of transient "
"network '%s'"), network->def->name);
return -1;
}
} else if (!live) {
virNetworkDefFree(network->newDef); /* should be unnecessary */
virNetworkDefFree(network->def);
network->def = def;
} else {
virReportError(VIR_ERR_OPERATION_INVALID,
_("cannot save live config of inactive "
"network '%s'"), network->def->name);
return -1;
}
return 0;
}
/*
* virNetworkAssignDef:
* @nets: list of all networks
* @def: the new NetworkDef (will be consumed by this function iff successful)
* @live: is this new def the "live" version, or the "persistent" version
*
* Either replace the appropriate copy of the NetworkDef with name
* matching def->name or, if not found, create a new NetworkObj with
* def. For an existing network, use "live" and current state of the
* network to determine which to replace.
*
* Returns -1 on failure, 0 on success.
*/
virNetworkObjPtr
virNetworkAssignDef(virNetworkObjListPtr nets,
const virNetworkDefPtr def,
bool live)
{
virNetworkObjPtr network;
if ((network = virNetworkFindByName(nets, def->name))) {
if (!virNetworkObjIsActive(network)) {
virNetworkDefFree(network->def);
network->def = def;
} else {
virNetworkDefFree(network->newDef);
network->newDef = def;
if (virNetworkObjAssignDef(network, def, live) < 0) {
return NULL;
}
return network;
}
@ -270,6 +324,150 @@ virNetworkObjPtr virNetworkAssignDef(virNetworkObjListPtr nets,
}
/*
* virNetworkObjSetDefTransient:
* @network: network object pointer
* @live: if true, run this operation even for an inactive network.
* this allows freely updated network->def with runtime defaults
* before starting the network, which will be discarded on network
* shutdown. Any cleanup paths need to be sure to handle newDef if
* the network is never started.
*
* Mark the active network config as transient. Ensures live-only update
* operations do not persist past network destroy.
*
* Returns 0 on success, -1 on failure
*/
int
virNetworkObjSetDefTransient(virNetworkObjPtr network, bool live)
{
if (!virNetworkObjIsActive(network) && !live)
return 0;
if (!network->persistent || network->newDef)
return 0;
network->newDef = virNetworkDefCopy(network->def, VIR_NETWORK_XML_INACTIVE);
return network->newDef ? 0 : -1;
}
/*
* virNetworkObjGetPersistentDef:
* @network: network object pointer
*
* Return the persistent network configuration. If network is transient,
* return the running config.
*
* Returns NULL on error, virNetworkDefPtr on success.
*/
virNetworkDefPtr
virNetworkObjGetPersistentDef(virNetworkObjPtr network)
{
if (network->newDef)
return network->newDef;
else
return network->def;
}
/*
* virNetworkObjReplacePersistentDef:
* @network: network object pointer
* @def: new virNetworkDef to replace current persistent config
*
* Replace the "persistent" network configuration with the given new
* virNetworkDef. This pays attention to whether or not the network
* is active.
*
* Returns -1 on error, 0 on success
*/
int
virNetworkObjReplacePersistentDef(virNetworkObjPtr network,
virNetworkDefPtr def)
{
if (virNetworkObjIsActive(network)) {
virNetworkDefFree(network->newDef);
network->newDef = def;
} else {
virNetworkDefFree(network->def);
network->def = def;
}
return 0;
}
/*
* virNetworkDefCopy:
* @def: NetworkDef to copy
* @flags: VIR_NETWORK_XML_INACTIVE if appropriate
*
* make a deep copy of the given NetworkDef
*
* Returns a new NetworkDef on success, or NULL on failure.
*/
virNetworkDefPtr
virNetworkDefCopy(virNetworkDefPtr def, unsigned int flags)
{
char *xml = NULL;
virNetworkDefPtr newDef = NULL;
if (!def) {
virReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("NULL NetworkDef"));
return NULL;
}
/* deep copy with a format/parse cycle */
if (!(xml = virNetworkDefFormat(def, flags)))
goto cleanup;
newDef = virNetworkDefParseString(xml);
cleanup:
VIR_FREE(xml);
return newDef;
}
/*
* virNetworkConfigChangeSetup:
*
* 1) checks whether network state is consistent with the requested
* type of modification.
*
* 3) make sure there are separate "def" and "newDef" copies of
* networkDef if appropriate.
*
* Returns 0 on success, -1 on error.
*/
int
virNetworkConfigChangeSetup(virNetworkObjPtr network, unsigned int flags)
{
bool isActive;
int ret = -1;
isActive = virNetworkObjIsActive(network);
if (!isActive && (flags & VIR_NETWORK_UPDATE_AFFECT_LIVE)) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("network is not running"));
goto cleanup;
}
if (flags & VIR_NETWORK_UPDATE_AFFECT_CONFIG) {
if (!network->persistent) {
virReportError(VIR_ERR_OPERATION_INVALID, "%s",
_("cannot change persistent config of a "
"transient network"));
goto cleanup;
}
/* this should already have been done by the driver, but do it
* anyway just in case.
*/
if (isActive && (virNetworkObjSetDefTransient(network, false) < 0))
goto cleanup;
}
ret = 0;
cleanup:
return ret;
}
void virNetworkRemoveInactive(virNetworkObjListPtr nets,
const virNetworkObjPtr net)
{
@ -1791,7 +1989,7 @@ int virNetworkSaveConfig(const char *configDir,
int ret = -1;
char *xml;
if (!(xml = virNetworkDefFormat(def, 0)))
if (!(xml = virNetworkDefFormat(def, VIR_NETWORK_XML_INACTIVE)))
goto cleanup;
if (virNetworkSaveXML(configDir, def, xml))
@ -1804,6 +2002,24 @@ cleanup:
}
int virNetworkSaveStatus(const char *statusDir,
virNetworkObjPtr network)
{
int ret = -1;
char *xml;
if (!(xml = virNetworkDefFormat(network->def, 0)))
goto cleanup;
if (virNetworkSaveXML(statusDir, network->def, xml))
goto cleanup;
ret = 0;
cleanup:
VIR_FREE(xml);
return ret;
}
virNetworkObjPtr virNetworkLoadConfig(virNetworkObjListPtr nets,
const char *configDir,
const char *autostartDir,
@ -1844,7 +2060,7 @@ virNetworkObjPtr virNetworkLoadConfig(virNetworkObjListPtr nets,
goto error;
}
if (!(net = virNetworkAssignDef(nets, def)))
if (!(net = virNetworkAssignDef(nets, def, false)))
goto error;
net->autostart = autostart;

16
src/conf/network_conf.h
View File

@ -247,7 +247,18 @@ void virNetworkObjFree(virNetworkObjPtr net);
void virNetworkObjListFree(virNetworkObjListPtr vms);
virNetworkObjPtr virNetworkAssignDef(virNetworkObjListPtr nets,
const virNetworkDefPtr def);
const virNetworkDefPtr def,
bool live);
int virNetworkObjAssignDef(virNetworkObjPtr network,
const virNetworkDefPtr def,
bool live);
int virNetworkObjSetDefTransient(virNetworkObjPtr network, bool live);
virNetworkDefPtr virNetworkObjGetPersistentDef(virNetworkObjPtr network);
int virNetworkObjReplacePersistentDef(virNetworkObjPtr network,
virNetworkDefPtr def);
virNetworkDefPtr virNetworkDefCopy(virNetworkDefPtr def, unsigned int flags);
int virNetworkConfigChangeSetup(virNetworkObjPtr dom, unsigned int flags);
void virNetworkRemoveInactive(virNetworkObjListPtr nets,
const virNetworkObjPtr net);
@ -283,6 +294,9 @@ int virNetworkSaveXML(const char *configDir,
int virNetworkSaveConfig(const char *configDir,
virNetworkDefPtr def);
int virNetworkSaveStatus(const char *statusDir,
virNetworkObjPtr net) ATTRIBUTE_RETURN_CHECK;
virNetworkObjPtr virNetworkLoadConfig(virNetworkObjListPtr nets,
const char *configDir,
const char *autostartDir,

10
src/libvirt_private.syms
View File

@ -839,6 +839,8 @@ virNetDevVPortTypeToString;
# network_conf.h
virNetworkAssignDef;
virNetworkConfigFile;
virNetworkConfigChangeSetup;
virNetworkDefCopy;
virNetworkDefFormat;
virNetworkDefFree;
virNetworkDefGetIpByIndex;
@ -852,15 +854,21 @@ virNetworkIpDefNetmask;
virNetworkIpDefPrefix;
virNetworkList;
virNetworkLoadAllConfigs;
virNetworkObjAssignDef;
virNetworkObjFree;
virNetworkObjGetPersistentDef;
virNetworkObjIsDuplicate;
virNetworkObjListFree;
virNetworkObjLock;
virNetworkObjReplacePersistentDef;
virNetworkObjSetDefTransient;
virNetworkObjUnlock;
virNetworkObjFree;
virNetworkRemoveInactive;
virNetworkSaveConfig;
virNetworkSaveStatus;
virNetworkSetBridgeMacAddr;
virNetworkSetBridgeName;
virNetworkSetDefTransient;
virPortGroupFindByName;

14
src/network/bridge_driver.c
View File

@ -2023,6 +2023,9 @@ networkStartNetwork(struct network_driver *driver,
return -1;
}
if (virNetworkObjSetDefTransient(network, true) < 0)
return -1;
switch (network->def->forwardType) {
case VIR_NETWORK_FORWARD_NONE:
@ -2046,7 +2049,7 @@ networkStartNetwork(struct network_driver *driver,
/* Persist the live configuration now that anything autogenerated
* is setup.
*/
if ((ret = virNetworkSaveConfig(NETWORK_STATE_DIR, network->def)) < 0) {
if ((ret = virNetworkSaveStatus(NETWORK_STATE_DIR, network)) < 0) {
goto error;
}
@ -2389,8 +2392,10 @@ static virNetworkPtr networkCreate(virConnectPtr conn, const char *xml) {
if (networkValidate(def) < 0)
goto cleanup;
if (!(network = virNetworkAssignDef(&driver->networks,
def)))
/* NB: "live" is false because this transient network hasn't yet
* been started
*/
if (!(network = virNetworkAssignDef(&driver->networks, def, false)))
goto cleanup;
def = NULL;
@ -2465,8 +2470,7 @@ static virNetworkPtr networkDefine(virConnectPtr conn, const char *xml) {
if (networkValidate(def) < 0)
goto cleanup;
if (!(network = virNetworkAssignDef(&driver->networks,
def)))
if (!(network = virNetworkAssignDef(&driver->networks, def, false)))
goto cleanup;
freeDef = false;

9
src/test/test_driver.c
View File

@ -579,7 +579,7 @@ static int testOpenDefault(virConnectPtr conn) {
if (!(netdef = virNetworkDefParseString(defaultNetworkXML)))
goto error;
if (!(netobj = virNetworkAssignDef(&privconn->networks, netdef))) {
if (!(netobj = virNetworkAssignDef(&privconn->networks, netdef, false))) {
virNetworkDefFree(netdef);
goto error;
}
@ -948,8 +948,7 @@ static int testOpenFromFile(virConnectPtr conn,
if ((def = virNetworkDefParseNode(xml, networks[i])) == NULL)
goto error;
}
if (!(net = virNetworkAssignDef(&privconn->networks,
def))) {
if (!(net = virNetworkAssignDef(&privconn->networks, def, false))) {
virNetworkDefFree(def);
goto error;
}
@ -3112,7 +3111,7 @@ static virNetworkPtr testNetworkCreate(virConnectPtr conn, const char *xml) {
if ((def = virNetworkDefParseString(xml)) == NULL)
goto cleanup;
if ((net = virNetworkAssignDef(&privconn->networks, def)) == NULL)
if (!(net = virNetworkAssignDef(&privconn->networks, def, false)))
goto cleanup;
def = NULL;
net->active = 1;
@ -3137,7 +3136,7 @@ static virNetworkPtr testNetworkDefine(virConnectPtr conn, const char *xml) {
if ((def = virNetworkDefParseString(xml)) == NULL)
goto cleanup;
if ((net = virNetworkAssignDef(&privconn->networks, def)) == NULL)
if (!(net = virNetworkAssignDef(&privconn->networks, def, false)))
goto cleanup;
def = NULL;
net->persistent = 1;