Re: [libvirt] [PATCH v4 16/23] security_manager: Introduce metadata locking APIs

+int +virSecurityManagerMetadataLock(virSecurityManagerPtr mgr, + const char * const *paths, + size_t npaths) +{ + virLockManagerPtr lock; + virTimeBackOffVar timebackoff; + int fd = -1; + int rv;

+ int ret = -1; + + virMutexLock(&lockManagerMutex); + + if (!(lock = virSecurityManagerNewLockManager(mgr, paths, npaths))) + goto cleanup; + + if (virTimeBackOffStart(&timebackoff, 1, LOCK_ACQUIRE_TIMEOUT * 1000) < 0) + goto cleanup; + while (virTimeBackOffWait(&timebackoff)) { + rv = virLockManagerAcquire(lock, NULL, + VIR_LOCK_MANAGER_ACQUIRE_ROLLBACK, + VIR_DOMAIN_LOCK_FAILURE_DEFAULT, &fd); + + if (rv >= 0) + break; + + if (virGetLastErrorCode() == VIR_ERR_RESOURCE_BUSY) + continue; + + goto cleanup; + } + + if (rv < 0) + goto cleanup; + + mgr->fd = fd; + fd = -1; + + ret = 0; + cleanup: + virLockManagerFree(lock); + VIR_FORCE_CLOSE(fd); + if (ret < 0) + virMutexUnlock(&lockManagerMutex); + return ret; +}