[libvirt] [PATCH 0/4] vz: rework domain creation
Patches 1 and 2 make preparation for patch 4 Patch 3 fixes notification subscription To get domain info we should receive and handle notification from hypervisor Patch 4 fixes race condition when adding domain to domains list Race condition: User calls defineXML to create new instance. The main thread from vzDomainDefineXMLFlags() creates new instance by prlsdkCreateVm. Then this thread calls prlsdkAddDomain to add new domain to domains list. The second thread receives notification from hypervisor that new VM was created. It calls prlsdkHandleVmAddedEvent() and also tries to add new domain to domains list. These two threads call virDomainObjListFindByUUID() from prlsdkAddDomain() and don't find new domain. So they add two domains with the same uuid to domains list. Mikhail Feoktistov (4): vz: make output arguments in prlsdkGetDomainIds as optional vz: remove unused struct field vz: fix notification subscription vz: fix race condition when adding domain to domains list src/vz/vz_driver.c | 13 ++- src/vz/vz_sdk.c | 261 ++++++++++++++++++++++------------------------------- src/vz/vz_sdk.h | 7 +- src/vz/vz_utils.c | 44 +++++++++ src/vz/vz_utils.h | 5 +- 5 files changed, 174 insertions(+), 156 deletions(-) -- 1.8.3.1
prlsdkGetDomainIds() returns name and uuid for specified instance. Now output arguments can be NULL. It allows to get only necessary info(name or uuid). --- src/vz/vz_sdk.c | 38 ++++++++++++++++++++++---------------- 1 file changed, 22 insertions(+), 16 deletions(-) diff --git a/src/vz/vz_sdk.c b/src/vz/vz_sdk.c index 30ea545..a47c5d6 100644 --- a/src/vz/vz_sdk.c +++ b/src/vz/vz_sdk.c @@ -346,31 +346,37 @@ prlsdkGetDomainIds(PRL_HANDLE sdkdom, PRL_UINT32 len; PRL_RESULT pret; - len = 0; - /* get name length */ - pret = PrlVmCfg_GetName(sdkdom, NULL, &len); - prlsdkCheckRetGoto(pret, error); + if (name) { + len = 0; + *name = NULL; + /* get name length */ + pret = PrlVmCfg_GetName(sdkdom, NULL, &len); + prlsdkCheckRetGoto(pret, error); - if (VIR_ALLOC_N(*name, len) < 0) - goto error; + if (VIR_ALLOC_N(*name, len) < 0) + goto error; - PrlVmCfg_GetName(sdkdom, *name, &len); - prlsdkCheckRetGoto(pret, error); + pret = PrlVmCfg_GetName(sdkdom, *name, &len); + prlsdkCheckRetGoto(pret, error); + } - len = sizeof(uuidstr); - PrlVmCfg_GetUuid(sdkdom, uuidstr, &len); - prlsdkCheckRetGoto(pret, error); + if (uuid) { + len = sizeof(uuidstr); + pret = PrlVmCfg_GetUuid(sdkdom, uuidstr, &len); + prlsdkCheckRetGoto(pret, error); - if (prlsdkUUIDParse(uuidstr, uuid) < 0) { - virReportError(VIR_ERR_INTERNAL_ERROR, "%s", - _("Domain UUID is malformed or empty")); - goto error; + if (prlsdkUUIDParse(uuidstr, uuid) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", + _("Domain UUID is malformed or empty")); + goto error; + } } return 0; error: - VIR_FREE(*name); + if (name) + VIR_FREE(*name); return -1; } -- 1.8.3.1
In commit 7039bb3c we have removed code that saves uuid to vzDomObj.uuid So this field is no longer needed. --- src/vz/vz_sdk.c | 5 ----- src/vz/vz_utils.h | 1 - 2 files changed, 6 deletions(-) diff --git a/src/vz/vz_sdk.c b/src/vz/vz_sdk.c index a47c5d6..3b7d7b3 100644 --- a/src/vz/vz_sdk.c +++ b/src/vz/vz_sdk.c @@ -419,7 +419,6 @@ prlsdkDomObjFreePrivate(void *p) PrlHandle_Free(pdom->sdkdom); PrlHandle_Free(pdom->cache.stats); virCondDestroy(&pdom->cache.cond); - VIR_FREE(pdom->uuid); VIR_FREE(pdom->home); VIR_FREE(p); }; @@ -1287,10 +1286,6 @@ prlsdkLoadDomain(vzConnPtr privconn, def->id = -1; - /* we will remove this field in the near future, so let's set it - * to NULL temporarily */ - pdom->uuid = NULL; - pdom->cache.stats = PRL_INVALID_HANDLE; pdom->cache.count = -1; if (virCondInit(&pdom->cache.cond) < 0) { diff --git a/src/vz/vz_utils.h b/src/vz/vz_utils.h index b7a4c81..417f821 100644 --- a/src/vz/vz_utils.h +++ b/src/vz/vz_utils.h @@ -76,7 +76,6 @@ typedef struct _vzCountersCache vzCountersCache; struct vzDomObj { int id; - char *uuid; char *home; PRL_HANDLE sdkdom; vzCountersCache cache; -- 1.8.3.1
Bug cause: Update the domain that is subscribed to hypervisor notification. LoadDomain() rewrites notifications fields in vzDomObj structure and makes domain as "unsubscribed". Fix: Initialize notification fields in vzDomObj only if we create a new domain. And do not reinitialize these fields if we update domain (by calling LoadDomain with olddom argument) --- src/vz/vz_sdk.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) diff --git a/src/vz/vz_sdk.c b/src/vz/vz_sdk.c index 3b7d7b3..4423788 100644 --- a/src/vz/vz_sdk.c +++ b/src/vz/vz_sdk.c @@ -1275,6 +1275,12 @@ prlsdkLoadDomain(vzConnPtr privconn, if (!olddom) { if (VIR_ALLOC(pdom) < 0) goto error; + pdom->cache.stats = PRL_INVALID_HANDLE; + pdom->cache.count = -1; + if (virCondInit(&pdom->cache.cond) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("cannot initialize condition")); + goto error; + } } else { pdom = olddom->privateData; } @@ -1286,13 +1292,6 @@ prlsdkLoadDomain(vzConnPtr privconn, def->id = -1; - pdom->cache.stats = PRL_INVALID_HANDLE; - pdom->cache.count = -1; - if (virCondInit(&pdom->cache.cond) < 0) { - virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("cannot initialize condition")); - goto error; - } - if (prlsdkGetDomainIds(sdkdom, &def->name, def->uuid) < 0) goto error; -- 1.8.3.1
Race condition: User calls defineXML to create new instance. The main thread from vzDomainDefineXMLFlags() creates new instance by prlsdkCreateVm. Then this thread calls prlsdkAddDomain to add new domain to domains list. The second thread receives notification from hypervisor that new VM was created. It calls prlsdkHandleVmAddedEvent() and also tries to add new domain to domains list. These two threads call virDomainObjListFindByUUID() from prlsdkAddDomain() and don't find new domain. So they add two domains with the same uuid to domains list. This fix splits logic of prlsdkAddDomain() into two functions. 1. vzNewDomain() creates new empty domain in domains list with the specific uuid. 2. prlsdkLoadDomain() add data from VM to domain object. New algorithm for creating an instance: In vzDomainDefineXMLFlags() we add new domain to domain list by calling vzNewDomain() and only after that we call CreateVm() to create VM. It means that we "reserve" domain object with the specific uuid. After creation of new VM we add info from this VM to reserved domain object by calling prlsdkLoadDomain(). Before this patch prlsdkLoadDomain() worked in 2 different cases: 1. It creates and initializes new domain. Then updates it from sdk handle. 2. It updates existed domain from sdk handle. In this patch we remove code which creates new domain from LoadDomain() and move it to vzNewDomain(). Now prlsdkLoadDomain() only updates domain from skd handle. In notification handler prlsdkHandleVmAddedEvent() we check the existence of a domain and if it doesn't exist we add new domain by calling vzNewDomain() and load info from sdk handle via prlsdkLoadDomain(). --- src/vz/vz_driver.c | 13 +++- src/vz/vz_sdk.c | 217 ++++++++++++++++++++++------------------------------- src/vz/vz_sdk.h | 7 +- src/vz/vz_utils.c | 44 +++++++++++ src/vz/vz_utils.h | 4 + 5 files changed, 152 insertions(+), 133 deletions(-) diff --git a/src/vz/vz_driver.c b/src/vz/vz_driver.c index 925ff32..f7a8617 100644 --- a/src/vz/vz_driver.c +++ b/src/vz/vz_driver.c @@ -688,6 +688,7 @@ vzDomainDefineXMLFlags(virConnectPtr conn, const char *xml, unsigned int flags) virDomainPtr retdom = NULL; virDomainDefPtr def; virDomainObjPtr olddom = NULL; + virDomainObjPtr newdom = NULL; unsigned int parse_flags = VIR_DOMAIN_DEF_PARSE_INACTIVE; virCheckFlags(VIR_DOMAIN_DEFINE_VALIDATE, NULL); @@ -703,6 +704,9 @@ vzDomainDefineXMLFlags(virConnectPtr conn, const char *xml, unsigned int flags) olddom = virDomainObjListFindByUUID(privconn->domains, def->uuid); if (olddom == NULL) { virResetLastError(); + newdom = vzNewDomain(privconn, def->name, def->uuid); + if (!newdom) + goto cleanup; if (def->os.type == VIR_DOMAIN_OSTYPE_HVM) { if (prlsdkCreateVm(conn, def)) goto cleanup; @@ -716,8 +720,7 @@ vzDomainDefineXMLFlags(virConnectPtr conn, const char *xml, unsigned int flags) goto cleanup; } - olddom = prlsdkAddDomain(privconn, def->uuid); - if (!olddom) + if (prlsdkLoadDomain(privconn, newdom)) goto cleanup; } else { int state, reason; @@ -758,6 +761,12 @@ vzDomainDefineXMLFlags(virConnectPtr conn, const char *xml, unsigned int flags) cleanup: if (olddom) virObjectUnlock(olddom); + if (newdom) { + if (!retdom) + virDomainObjListRemove(privconn->domains, newdom); + else + virObjectUnlock(newdom); + } virDomainDefFree(def); vzDriverUnlock(privconn); return retdom; diff --git a/src/vz/vz_sdk.c b/src/vz/vz_sdk.c index 4423788..92bb7c5 100644 --- a/src/vz/vz_sdk.c +++ b/src/vz/vz_sdk.c @@ -408,7 +408,7 @@ prlsdkGetDomainState(PRL_HANDLE sdkdom, VIRTUAL_MACHINE_STATE_PTR vmState) return ret; } -static void +void prlsdkDomObjFreePrivate(void *p) { vzDomObjPtr pdom = p; @@ -1241,56 +1241,58 @@ prlsdkConvertCpuMode(PRL_HANDLE sdkdom, virDomainDefPtr def) return -1; } -/* - * This function retrieves information about domain. - * If the domains is already in the domains list - * privconn->domains, then locked 'olddom' must be - * provided. If the domains must be added to the list, - * olddom must be NULL. - * - * The function return a pointer to a locked virDomainObj. - */ static virDomainObjPtr -prlsdkLoadDomain(vzConnPtr privconn, - PRL_HANDLE sdkdom, - virDomainObjPtr olddom) +prlsdkNewDomainByHandle(vzConnPtr privconn, PRL_HANDLE sdkdom) { virDomainObjPtr dom = NULL; + unsigned char uuid[VIR_UUID_BUFLEN]; + char *name = NULL; + + if (prlsdkGetDomainIds(sdkdom, &name, uuid) < 0) + goto cleanup; + + if (!(dom = vzNewDomain(privconn, name, uuid))) + goto cleanup; + + if (prlsdkLoadDomain(privconn, dom) < 0) { + virDomainObjListRemove(privconn->domains, dom); + dom = NULL; + goto cleanup; + } + + cleanup: + VIR_FREE(name); + return dom; +} + +int +prlsdkLoadDomain(vzConnPtr privconn, virDomainObjPtr dom) +{ virDomainDefPtr def = NULL; vzDomObjPtr pdom = NULL; VIRTUAL_MACHINE_STATE domainState; + char *home = NULL; PRL_UINT32 buflen = 0; PRL_RESULT pret; PRL_UINT32 ram; PRL_UINT32 envId; PRL_VM_AUTOSTART_OPTION autostart; + PRL_HANDLE sdkdom = PRL_INVALID_HANDLE; virCheckNonNullArgGoto(privconn, error); - virCheckNonNullArgGoto(sdkdom, error); + virCheckNonNullArgGoto(dom, error); + + pdom = dom->privateData; + sdkdom = prlsdkSdkDomainLookupByUUID(privconn, dom->def->uuid); + if (sdkdom == PRL_INVALID_HANDLE) + return -1; if (!(def = virDomainDefNew())) goto error; - if (!olddom) { - if (VIR_ALLOC(pdom) < 0) - goto error; - pdom->cache.stats = PRL_INVALID_HANDLE; - pdom->cache.count = -1; - if (virCondInit(&pdom->cache.cond) < 0) { - virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("cannot initialize condition")); - goto error; - } - } else { - pdom = olddom->privateData; - } - - if (STREQ(privconn->drivername, "vz")) - def->virtType = VIR_DOMAIN_VIRT_VZ; - else - def->virtType = VIR_DOMAIN_VIRT_PARALLELS; - - def->id = -1; + def->virtType = dom->def->virtType; + def->id = dom->def->id; if (prlsdkGetDomainIds(sdkdom, &def->name, def->uuid) < 0) goto error; @@ -1323,29 +1325,33 @@ prlsdkLoadDomain(vzConnPtr privconn, pret = PrlVmCfg_GetEnvId(sdkdom, &envId); prlsdkCheckRetGoto(pret, error); - pdom->id = envId; buflen = 0; pret = PrlVmCfg_GetHomePath(sdkdom, NULL, &buflen); prlsdkCheckRetGoto(pret, error); - VIR_FREE(pdom->home); - if (VIR_ALLOC_N(pdom->home, buflen) < 0) + if (VIR_ALLOC_N(home, buflen) < 0) goto error; - pret = PrlVmCfg_GetHomePath(sdkdom, pdom->home, &buflen); + pret = PrlVmCfg_GetHomePath(sdkdom, home, &buflen); prlsdkCheckRetGoto(pret, error); - /* For VMs pdom->home is actually /directory/config.pvs */ + /* For VMs home is actually /directory/config.pvs */ if (!IS_CT(def)) { /* Get rid of /config.pvs in path string */ - char *s = strrchr(pdom->home, '/'); + char *s = strrchr(home, '/'); if (s) *s = '\0'; } pret = PrlVmCfg_GetAutoStart(sdkdom, &autostart); prlsdkCheckRetGoto(pret, error); + if (autostart != PAO_VM_START_ON_LOAD && + autostart != PAO_VM_START_MANUAL) { + virReportError(VIR_ERR_INTERNAL_ERROR, + _("Unknown autostart mode: %X"), autostart); + goto error; + } if (prlsdkGetDomainState(sdkdom, &domainState) < 0) goto error; @@ -1368,65 +1374,35 @@ prlsdkLoadDomain(vzConnPtr privconn, goto error; } - if (olddom) { - /* assign new virDomainDef without any checks */ - /* we can't use virDomainObjAssignDef, because it checks - * for state and domain name */ - dom = olddom; - virDomainDefFree(dom->def); - dom->def = def; - } else { - if (!(dom = virDomainObjListAdd(privconn->domains, def, - privconn->xmlopt, - 0, NULL))) - goto error; - } - /* dom is locked here */ - - dom->privateData = pdom; - dom->privateDataFreeFunc = prlsdkDomObjFreePrivate; - dom->persistent = 1; - - switch (autostart) { - case PAO_VM_START_ON_LOAD: - dom->autostart = 1; - break; - case PAO_VM_START_MANUAL: - dom->autostart = 0; - break; - default: - virReportError(VIR_ERR_INTERNAL_ERROR, - _("Unknown autostart mode: %X"), autostart); - goto error; - } - if (prlsdkConvertDomainState(domainState, envId, dom) < 0) goto error; + /* assign new virDomainDef without any checks + * we can't use virDomainObjAssignDef, because it checks + * for state and domain name */ + virDomainDefFree(dom->def); + dom->def = def; + pdom->id = envId; + VIR_FREE(pdom->home); + pdom->home = home; + if (!pdom->sdkdom) { - pret = PrlHandle_AddRef(sdkdom); - prlsdkCheckRetGoto(pret, error); + PrlHandle_AddRef(sdkdom); pdom->sdkdom = sdkdom; } - return dom; - error: - if (dom && !olddom) { - /* Domain isn't persistent means that we haven't yet set - * prlsdkDomObjFreePrivate and should call it manually - */ - if (!dom->persistent) - prlsdkDomObjFreePrivate(pdom); - - virDomainObjListRemove(privconn->domains, dom); - } - /* Delete newly allocated def only if we haven't assigned it to domain - * Otherwise we will end up with domain having invalid def within it - */ - if (!dom) - virDomainDefFree(def); + if (autostart == PAO_VM_START_ON_LOAD) + dom->autostart = 1; + else + dom->autostart = 0; - return NULL; + PrlHandle_Free(sdkdom); + return 0; + error: + PrlHandle_Free(sdkdom); + VIR_FREE(home); + virDomainDefFree(def); + return -1; } int @@ -1434,7 +1410,7 @@ prlsdkLoadDomains(vzConnPtr privconn) { PRL_HANDLE job = PRL_INVALID_HANDLE; PRL_HANDLE result; - PRL_HANDLE sdkdom; + PRL_HANDLE sdkdom = PRL_INVALID_HANDLE; PRL_UINT32 paramsCount; PRL_RESULT pret; size_t i = 0; @@ -1450,63 +1426,36 @@ prlsdkLoadDomains(vzConnPtr privconn) for (i = 0; i < paramsCount; i++) { pret = PrlResult_GetParamByIndex(result, i, &sdkdom); - if (PRL_FAILED(pret)) { - logPrlError(pret); - PrlHandle_Free(sdkdom); + prlsdkCheckRetGoto(pret, error); + + if (!(dom = prlsdkNewDomainByHandle(privconn, sdkdom))) goto error; - } - dom = prlsdkLoadDomain(privconn, sdkdom, NULL); + virObjectUnlock(dom); PrlHandle_Free(sdkdom); - - if (!dom) - goto error; - else - virObjectUnlock(dom); + sdkdom = PRL_INVALID_HANDLE; } PrlHandle_Free(result); return 0; error: + PrlHandle_Free(sdkdom); PrlHandle_Free(result); return -1; } -virDomainObjPtr -prlsdkAddDomain(vzConnPtr privconn, const unsigned char *uuid) -{ - PRL_HANDLE sdkdom = PRL_INVALID_HANDLE; - virDomainObjPtr dom; - - dom = virDomainObjListFindByUUID(privconn->domains, uuid); - if (dom) { - /* domain is already in the list */ - return dom; - } - - sdkdom = prlsdkSdkDomainLookupByUUID(privconn, uuid); - if (sdkdom == PRL_INVALID_HANDLE) - return NULL; - - dom = prlsdkLoadDomain(privconn, sdkdom, NULL); - PrlHandle_Free(sdkdom); - return dom; -} - int prlsdkUpdateDomain(vzConnPtr privconn, virDomainObjPtr dom) { PRL_HANDLE job; - virDomainObjPtr retdom = NULL; vzDomObjPtr pdom = dom->privateData; job = PrlVm_RefreshConfig(pdom->sdkdom); if (waitJob(job)) return -1; - retdom = prlsdkLoadDomain(privconn, pdom->sdkdom, dom); - return retdom ? 0 : -1; + return prlsdkLoadDomain(privconn, dom); } static int prlsdkSendEvent(vzConnPtr privconn, @@ -1623,15 +1572,25 @@ prlsdkHandleVmAddedEvent(vzConnPtr privconn, unsigned char *uuid) { virDomainObjPtr dom = NULL; + PRL_HANDLE sdkdom = PRL_INVALID_HANDLE; - dom = prlsdkAddDomain(privconn, uuid); - if (dom == NULL) - return; + dom = virDomainObjListFindByUUID(privconn->domains, uuid); + if (!dom) { + sdkdom = prlsdkSdkDomainLookupByUUID(privconn, uuid); + if (sdkdom == PRL_INVALID_HANDLE) + goto cleanup; + + if (!(dom = prlsdkNewDomainByHandle(privconn, sdkdom))) + goto cleanup; + } prlsdkSendEvent(privconn, dom, VIR_DOMAIN_EVENT_DEFINED, VIR_DOMAIN_EVENT_DEFINED_ADDED); - virObjectUnlock(dom); + cleanup: + if (dom) + virObjectUnlock(dom); + PrlHandle_Free(sdkdom); return; } diff --git a/src/vz/vz_sdk.h b/src/vz/vz_sdk.h index ff6be07..c2d9cb4 100644 --- a/src/vz/vz_sdk.h +++ b/src/vz/vz_sdk.h @@ -30,9 +30,10 @@ int prlsdkConnect(vzConnPtr privconn); void prlsdkDisconnect(vzConnPtr privconn); int prlsdkLoadDomains(vzConnPtr privconn); -virDomainObjPtr -prlsdkAddDomain(vzConnPtr privconn, const unsigned char *uuid); int prlsdkUpdateDomain(vzConnPtr privconn, virDomainObjPtr dom); +int +prlsdkLoadDomain(vzConnPtr privconn, + virDomainObjPtr dom); int prlsdkSubscribeToPCSEvents(vzConnPtr privconn); void prlsdkUnsubscribeFromPCSEvents(vzConnPtr privconn); PRL_RESULT prlsdkStart(PRL_HANDLE sdkdom); @@ -77,3 +78,5 @@ int prlsdkGetVcpuStats(virDomainObjPtr dom, int idx, unsigned long long *time); int prlsdkGetMemoryStats(virDomainObjPtr dom, virDomainMemoryStatPtr stats, unsigned int nr_stats); +void +prlsdkDomObjFreePrivate(void *p); diff --git a/src/vz/vz_utils.c b/src/vz/vz_utils.c index 894f7dd..a1ddad0 100644 --- a/src/vz/vz_utils.c +++ b/src/vz/vz_utils.c @@ -29,6 +29,7 @@ #include "viralloc.h" #include "virjson.h" #include "vz_utils.h" +#include "vz_sdk.h" #include "virstring.h" #include "datatypes.h" @@ -134,3 +135,46 @@ vzGetOutput(const char *binary, ...) return outbuf; } + +virDomainObjPtr +vzNewDomain(vzConnPtr privconn, char *name, const unsigned char *uuid) +{ + virDomainDefPtr def = NULL; + virDomainObjPtr dom = NULL; + vzDomObjPtr pdom = NULL; + + if (!(def = virDomainDefNewFull(name, uuid, -1))) + goto error; + + if (VIR_ALLOC(pdom) < 0) + goto error; + + if (virCondInit(&pdom->cache.cond) < 0) { + virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("cannot initialize condition")); + goto error; + } + pdom->cache.stats = PRL_INVALID_HANDLE; + pdom->cache.count = -1; + + if (STREQ(privconn->drivername, "vz")) + def->virtType = VIR_DOMAIN_VIRT_VZ; + else + def->virtType = VIR_DOMAIN_VIRT_PARALLELS; + + if (!(dom = virDomainObjListAdd(privconn->domains, def, + privconn->xmlopt, + 0, NULL))) + goto error; + + dom->privateData = pdom; + dom->privateDataFreeFunc = prlsdkDomObjFreePrivate; + dom->persistent = 1; + return dom; + + error: + if (pdom && pdom->cache.count == -1) + virCondDestroy(&pdom->cache.cond); + virDomainDefFree(def); + VIR_FREE(pdom); + return NULL; +} diff --git a/src/vz/vz_utils.h b/src/vz/vz_utils.h index 417f821..0976193 100644 --- a/src/vz/vz_utils.h +++ b/src/vz/vz_utils.h @@ -90,6 +90,10 @@ char * vzGetOutput(const char *binary, ...) ATTRIBUTE_NONNULL(1) ATTRIBUTE_SENTINEL; void vzDriverLock(vzConnPtr driver); void vzDriverUnlock(vzConnPtr driver); +virDomainObjPtr +vzNewDomain(vzConnPtr privconn, + char *name, + const unsigned char *uuid); # define PARALLELS_BLOCK_STATS_FOREACH(OP) \ OP(rd_req, VIR_DOMAIN_BLOCK_STATS_READ_REQ, "read_requests") \ -- 1.8.3.1
On 10.02.2016 12:39, Mikhail Feoktistov wrote:
Patches 1 and 2 make preparation for patch 4
Patch 3 fixes notification subscription To get domain info we should receive and handle notification from hypervisor
Patch 4 fixes race condition when adding domain to domains list Race condition: User calls defineXML to create new instance. The main thread from vzDomainDefineXMLFlags() creates new instance by prlsdkCreateVm. Then this thread calls prlsdkAddDomain to add new domain to domains list. The second thread receives notification from hypervisor that new VM was created. It calls prlsdkHandleVmAddedEvent() and also tries to add new domain to domains list. These two threads call virDomainObjListFindByUUID() from prlsdkAddDomain() and don't find new domain. So they add two domains with the same uuid to domains list.
Mikhail Feoktistov (4): vz: make output arguments in prlsdkGetDomainIds as optional vz: remove unused struct field vz: fix notification subscription vz: fix race condition when adding domain to domains list
src/vz/vz_driver.c | 13 ++- src/vz/vz_sdk.c | 261 ++++++++++++++++++++++------------------------------- src/vz/vz_sdk.h | 7 +- src/vz/vz_utils.c | 44 +++++++++ src/vz/vz_utils.h | 5 +- 5 files changed, 174 insertions(+), 156 deletions(-)
ACK to the series, but don't forget to put correct patch version in subject.
10.02.2016 12:39, Mikhail Feoktistov пишет:
Patches 1 and 2 make preparation for patch 4
Patch 3 fixes notification subscription To get domain info we should receive and handle notification from hypervisor
Patch 4 fixes race condition when adding domain to domains list Race condition: User calls defineXML to create new instance. The main thread from vzDomainDefineXMLFlags() creates new instance by prlsdkCreateVm. Then this thread calls prlsdkAddDomain to add new domain to domains list. The second thread receives notification from hypervisor that new VM was created. It calls prlsdkHandleVmAddedEvent() and also tries to add new domain to domains list. These two threads call virDomainObjListFindByUUID() from prlsdkAddDomain() and don't find new domain. So they add two domains with the same uuid to domains list.
Mikhail Feoktistov (4): vz: make output arguments in prlsdkGetDomainIds as optional vz: remove unused struct field vz: fix notification subscription vz: fix race condition when adding domain to domains list
src/vz/vz_driver.c | 13 ++- src/vz/vz_sdk.c | 261 ++++++++++++++++++++++------------------------------- src/vz/vz_sdk.h | 7 +- src/vz/vz_utils.c | 44 +++++++++ src/vz/vz_utils.h | 5 +- 5 files changed, 174 insertions(+), 156 deletions(-)
ACKed and pushed. Thank you. Best, Maxim
participants (3)
-
Maxim Nestratov -
Mikhail Feoktistov -
Nikolay Shirokovskiy