[libvirt PATCH v3 0/2] Automatic mutex management - part 4
Use the recently implemented VIR_LOCK_GUARD and VIR_WITH_MUTEX_LOCK_GUARD to simplify mutex management. V1: https://listman.redhat.com/archives/libvir-list/2022-March/229144.html V2: https://listman.redhat.com/archives/libvir-list/2022-March/229329.html Changes since V2: * Rewrote virQEMUDriverGetCapabilities, thanks Michal! * Added VIR_WITH_MUTEX_LOCK_GUARD to nwfilterConnectNumOfNWFilters * Other patches were reviewed and pushed. Tim Wiederhake (2): nwfilter_driver: Use automatic mutex management qemu_conf: Use automatic memory management src/nwfilter/nwfilter_driver.c | 94 +++++++++++++++------------------- src/qemu/qemu_conf.c | 63 ++++++++--------------- 2 files changed, 61 insertions(+), 96 deletions(-) -- 2.31.1
Signed-off-by: Tim Wiederhake <twiederh@redhat.com> --- src/nwfilter/nwfilter_driver.c | 94 +++++++++++++++------------------- 1 file changed, 40 insertions(+), 54 deletions(-) diff --git a/src/nwfilter/nwfilter_driver.c b/src/nwfilter/nwfilter_driver.c index c5f0169623..cac73c50e5 100644 --- a/src/nwfilter/nwfilter_driver.c +++ b/src/nwfilter/nwfilter_driver.c @@ -57,15 +57,6 @@ static int nwfilterStateReload(void); static virMutex driverMutex = VIR_MUTEX_INITIALIZER; -static void nwfilterDriverLock(void) -{ - virMutexLock(&driverMutex); -} -static void nwfilterDriverUnlock(void) -{ - virMutexUnlock(&driverMutex); -} - #ifdef WITH_FIREWALLD static void @@ -204,6 +195,7 @@ nwfilterStateInitialize(bool privileged, virStateInhibitCallback callback G_GNUC_UNUSED, void *opaque G_GNUC_UNUSED) { + VIR_LOCK_GUARD lock = virLockGuardLock(&driverMutex); GDBusConnection *sysbus = NULL; if (root != NULL) { @@ -230,8 +222,6 @@ nwfilterStateInitialize(bool privileged, if (!privileged) return VIR_DRV_STATE_INIT_SKIPPED; - nwfilterDriverLock(); - driver->stateDir = g_strdup(RUNSTATEDIR "/libvirt/nwfilter"); if (g_mkdir_with_parents(driver->stateDir, S_IRWXU) < 0) { @@ -290,13 +280,10 @@ nwfilterStateInitialize(bool privileged, if (virNWFilterBuildAll(driver, false) < 0) goto error; - nwfilterDriverUnlock(); - return VIR_DRV_STATE_INIT_COMPLETE; error: - nwfilterDriverUnlock(); - nwfilterStateCleanup(); + nwfilterStateCleanupLocked(); return VIR_DRV_STATE_INIT_ERROR; @@ -335,16 +322,15 @@ nwfilterStateReload(void) /* shut down all threads -- they will be restarted if necessary */ virNWFilterLearnThreadsTerminate(true); - nwfilterDriverLock(); - virNWFilterWriteLockFilterUpdates(); - - virNWFilterObjListLoadAllConfigs(driver->nwfilters, driver->configDir); + VIR_WITH_MUTEX_LOCK_GUARD(&driverMutex) { + virNWFilterWriteLockFilterUpdates(); - virNWFilterUnlockFilterUpdates(); + virNWFilterObjListLoadAllConfigs(driver->nwfilters, driver->configDir); - virNWFilterBuildAll(driver, false); + virNWFilterUnlockFilterUpdates(); - nwfilterDriverUnlock(); + virNWFilterBuildAll(driver, false); + } return 0; } @@ -422,13 +408,13 @@ static virNWFilterPtr nwfilterLookupByUUID(virConnectPtr conn, const unsigned char *uuid) { - virNWFilterObj *obj; + virNWFilterObj *obj = NULL; virNWFilterDef *def; virNWFilterPtr nwfilter = NULL; - nwfilterDriverLock(); - obj = nwfilterObjFromNWFilter(uuid); - nwfilterDriverUnlock(); + VIR_WITH_MUTEX_LOCK_GUARD(&driverMutex) { + obj = nwfilterObjFromNWFilter(uuid); + } if (!obj) return NULL; @@ -449,13 +435,13 @@ static virNWFilterPtr nwfilterLookupByName(virConnectPtr conn, const char *name) { - virNWFilterObj *obj; + virNWFilterObj *obj = NULL; virNWFilterDef *def; virNWFilterPtr nwfilter = NULL; - nwfilterDriverLock(); - obj = virNWFilterObjListFindByName(driver->nwfilters, name); - nwfilterDriverUnlock(); + VIR_WITH_MUTEX_LOCK_GUARD(&driverMutex) { + obj = virNWFilterObjListFindByName(driver->nwfilters, name); + } if (!obj) { virReportError(VIR_ERR_NO_NWFILTER, @@ -478,14 +464,15 @@ nwfilterLookupByName(virConnectPtr conn, static int nwfilterConnectNumOfNWFilters(virConnectPtr conn) { - int ret; + int ret = -1; if (virConnectNumOfNWFiltersEnsureACL(conn) < 0) return -1; - nwfilterDriverLock(); - ret = virNWFilterObjListNumOfNWFilters(driver->nwfilters, conn, - virConnectNumOfNWFiltersCheckACL); - nwfilterDriverUnlock(); + VIR_WITH_MUTEX_LOCK_GUARD(&driverMutex) { + ret = virNWFilterObjListNumOfNWFilters(driver->nwfilters, conn, + virConnectNumOfNWFiltersCheckACL); + } + return ret; } @@ -495,16 +482,17 @@ nwfilterConnectListNWFilters(virConnectPtr conn, char **const names, int maxnames) { - int nnames; + int nnames = -1; if (virConnectListNWFiltersEnsureACL(conn) < 0) return -1; - nwfilterDriverLock(); - nnames = virNWFilterObjListGetNames(driver->nwfilters, conn, - virConnectListNWFiltersCheckACL, - names, maxnames); - nwfilterDriverUnlock(); + VIR_WITH_MUTEX_LOCK_GUARD(&driverMutex) { + nnames = virNWFilterObjListGetNames(driver->nwfilters, conn, + virConnectListNWFiltersCheckACL, + names, maxnames); + } + return nnames; } @@ -514,17 +502,17 @@ nwfilterConnectListAllNWFilters(virConnectPtr conn, virNWFilterPtr **nwfilters, unsigned int flags) { - int ret; + int ret = -1; virCheckFlags(0, -1); if (virConnectListAllNWFiltersEnsureACL(conn) < 0) return -1; - nwfilterDriverLock(); - ret = virNWFilterObjListExport(conn, driver->nwfilters, nwfilters, - virConnectListAllNWFiltersCheckACL); - nwfilterDriverUnlock(); + VIR_WITH_MUTEX_LOCK_GUARD(&driverMutex) { + ret = virNWFilterObjListExport(conn, driver->nwfilters, nwfilters, + virConnectListAllNWFiltersCheckACL); + } return ret; } @@ -535,6 +523,7 @@ nwfilterDefineXMLFlags(virConnectPtr conn, const char *xml, unsigned int flags) { + VIR_LOCK_GUARD lock = virLockGuardLock(&driverMutex); virNWFilterDef *def; virNWFilterObj *obj = NULL; virNWFilterDef *objdef; @@ -549,7 +538,6 @@ nwfilterDefineXMLFlags(virConnectPtr conn, return NULL; } - nwfilterDriverLock(); virNWFilterWriteLockFilterUpdates(); if (!(def = virNWFilterDefParseString(xml, flags))) @@ -576,7 +564,6 @@ nwfilterDefineXMLFlags(virConnectPtr conn, virNWFilterObjUnlock(obj); virNWFilterUnlockFilterUpdates(); - nwfilterDriverUnlock(); return nwfilter; } @@ -592,11 +579,11 @@ nwfilterDefineXML(virConnectPtr conn, static int nwfilterUndefine(virNWFilterPtr nwfilter) { + VIR_LOCK_GUARD lock = virLockGuardLock(&driverMutex); virNWFilterObj *obj; virNWFilterDef *def; int ret = -1; - nwfilterDriverLock(); virNWFilterWriteLockFilterUpdates(); if (!(obj = nwfilterObjFromNWFilter(nwfilter->uuid))) @@ -625,7 +612,6 @@ nwfilterUndefine(virNWFilterPtr nwfilter) virNWFilterObjUnlock(obj); virNWFilterUnlockFilterUpdates(); - nwfilterDriverUnlock(); return ret; } @@ -634,15 +620,15 @@ static char * nwfilterGetXMLDesc(virNWFilterPtr nwfilter, unsigned int flags) { - virNWFilterObj *obj; + virNWFilterObj *obj = NULL; virNWFilterDef *def; char *ret = NULL; virCheckFlags(0, NULL); - nwfilterDriverLock(); - obj = nwfilterObjFromNWFilter(nwfilter->uuid); - nwfilterDriverUnlock(); + VIR_WITH_MUTEX_LOCK_GUARD(&driverMutex) { + obj = nwfilterObjFromNWFilter(nwfilter->uuid); + } if (!obj) return NULL; -- 2.31.1
Signed-off-by: Tim Wiederhake <twiederh@redhat.com> --- src/qemu/qemu_conf.c | 63 +++++++++++++++----------------------------- 1 file changed, 21 insertions(+), 42 deletions(-) diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c index 81449b8b77..c22cf79cbe 100644 --- a/src/qemu/qemu_conf.c +++ b/src/qemu/qemu_conf.c @@ -85,17 +85,6 @@ static int virQEMUConfigOnceInit(void) VIR_ONCE_GLOBAL_INIT(virQEMUConfig); -static void -qemuDriverLock(virQEMUDriver *driver) -{ - virMutexLock(&driver->lock); -} -static void -qemuDriverUnlock(virQEMUDriver *driver) -{ - virMutexUnlock(&driver->lock); -} - #ifndef DEFAULT_LOADER_NVRAM # define DEFAULT_LOADER_NVRAM \ "/usr/share/OVMF/OVMF_CODE.fd:/usr/share/OVMF/OVMF_VARS.fd:" \ @@ -1279,11 +1268,9 @@ virQEMUDriverConfigSetDefaults(virQEMUDriverConfig *cfg) virQEMUDriverConfig *virQEMUDriverGetConfig(virQEMUDriver *driver) { - virQEMUDriverConfig *conf; - qemuDriverLock(driver); - conf = virObjectRef(driver->config); - qemuDriverUnlock(driver); - return conf; + VIR_LOCK_GUARD lock = virLockGuardLock(&driver->lock); + + return virObjectRef(driver->config); } virDomainXMLOption * @@ -1303,16 +1290,13 @@ virQEMUDriverCreateXMLConf(virQEMUDriver *driver, virCPUDef * virQEMUDriverGetHostCPU(virQEMUDriver *driver) { - virCPUDef *hostcpu; - - qemuDriverLock(driver); + virCPUDef *hostcpu = NULL; - if (!driver->hostcpu) - driver->hostcpu = virCPUProbeHost(virArchFromHost()); - - hostcpu = driver->hostcpu; - - qemuDriverUnlock(driver); + VIR_WITH_MUTEX_LOCK_GUARD(&driver->lock) { + if (!driver->hostcpu) + driver->hostcpu = virCPUProbeHost(virArchFromHost()); + hostcpu = driver->hostcpu; + } if (hostcpu) virCPUDefRef(hostcpu); @@ -1389,32 +1373,27 @@ virCaps *virQEMUDriverCreateCapabilities(virQEMUDriver *driver) * Returns: a reference to a virCaps *instance or NULL */ virCaps *virQEMUDriverGetCapabilities(virQEMUDriver *driver, - bool refresh) + bool refresh) { - virCaps *ret = NULL; if (refresh) { virCaps *caps = NULL; if ((caps = virQEMUDriverCreateCapabilities(driver)) == NULL) return NULL; - qemuDriverLock(driver); - virObjectUnref(driver->caps); - driver->caps = caps; - } else { - qemuDriverLock(driver); - - if (driver->caps == NULL || - driver->caps->nguests == 0) { - VIR_DEBUG("Capabilities didn't detect any guests. Forcing a " - "refresh."); - qemuDriverUnlock(driver); - return virQEMUDriverGetCapabilities(driver, true); + VIR_WITH_MUTEX_LOCK_GUARD(&driver->lock) { + virObjectUnref(driver->caps); + driver->caps = caps; + return virObjectRef(driver->caps); } } - ret = virObjectRef(driver->caps); - qemuDriverUnlock(driver); - return ret; + VIR_WITH_MUTEX_LOCK_GUARD(&driver->lock) { + if (driver->caps && driver->caps->nguests > 0) + return virObjectRef(driver->caps); + } + + VIR_DEBUG("Capabilities didn't detect any guests. Forcing a refresh."); + return virQEMUDriverGetCapabilities(driver, true); } -- 2.31.1
On 3/17/22 16:50, Tim Wiederhake wrote:
Use the recently implemented VIR_LOCK_GUARD and VIR_WITH_MUTEX_LOCK_GUARD to simplify mutex management.
V1: https://listman.redhat.com/archives/libvir-list/2022-March/229144.html V2: https://listman.redhat.com/archives/libvir-list/2022-March/229329.html
Changes since V2: * Rewrote virQEMUDriverGetCapabilities, thanks Michal! * Added VIR_WITH_MUTEX_LOCK_GUARD to nwfilterConnectNumOfNWFilters * Other patches were reviewed and pushed.
Tim Wiederhake (2): nwfilter_driver: Use automatic mutex management qemu_conf: Use automatic memory management
src/nwfilter/nwfilter_driver.c | 94 +++++++++++++++------------------- src/qemu/qemu_conf.c | 63 ++++++++--------------- 2 files changed, 61 insertions(+), 96 deletions(-)
Reviewed-by: Michal Privoznik <mprivozn@redhat.com> Michal
participants (2)
-
Michal Prívozník -
Tim Wiederhake