[libvirt] [PATCH 3/6 v2] qemu: Implement domainSetBlkioParamters and domainGetBlkioParamters for QEmu

Implement domainSetBlkioParamters and domainGetBlkioParamters for QEmu v1-> v2 Changes: - Improve error message output suggested by Osier. Signed-off-by: Gui Jianfeng <guijianfeng(a)cn.fujitsu.com&gt; --- src/qemu/qemu_driver.c | 162 +++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 160 insertions(+), 2 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 882f323..abaefca 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -93,6 +93,7 @@ #define QEMU_NB_MEM_PARAM 3 +#define QEMU_NB_BLKIO_PARAM 1 #define timeval_to_ms(tv) (((tv).tv_sec * 1000ull) + ((tv).tv_usec / 1000)) @@ -7009,6 +7010,163 @@ cleanup: return ret; } +static int qemuDomainSetBlkioParameters(virDomainPtr dom, + virBlkioParameterPtr params, + int nparams, + unsigned int flags ATTRIBUTE_UNUSED) +{ + struct qemud_driver *driver = dom->conn->privateData; + int i; + virCgroupPtr group = NULL; + virDomainObjPtr vm = NULL; + int ret = -1; + + qemuDriverLock(driver); + if (!qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_BLKIO)) { + qemuReportError(VIR_ERR_NO_SUPPORT, _("blkio cgroup isn't mounted")); + goto cleanup; + } + + vm = virDomainFindByUUID(&driver->domains, dom->uuid); + + if (vm == NULL) { + qemuReportError(VIR_ERR_INTERNAL_ERROR, + _("No such domain %s"), dom->uuid); + goto cleanup; + } + + if (virCgroupForDomain(driver->cgroup, vm->def->name, &group, 0) != 0) { + qemuReportError(VIR_ERR_INTERNAL_ERROR, + _("cannot find cgroup for domain %s"), vm->def->name); + goto cleanup; + } + + ret = 0; + for (i = 0; i < nparams; i++) { + virBlkioParameterPtr param = &params[i]; + + if (STREQ(param->field, VIR_DOMAIN_BLKIO_WEIGHT)) { + int rc; + if (param->type != VIR_DOMAIN_BLKIO_PARAM_UINT) { + qemuReportError(VIR_ERR_INVALID_ARG, "%s", + _("invalid type for blkio weight tunable, expected a 'unsigned int'")); + ret = -1; + continue; + } + + if (params[i].value.ui > 1000 || params[i].value.ui < 100) { + qemuReportError(VIR_ERR_INVALID_ARG, "%s", + _("out of blkio weight range.")); + ret = -1; + continue; + } + + rc = virCgroupSetBlkioWeight(group, params[i].value.ui); + if (rc != 0) { + virReportSystemError(-rc, "%s", + _("unable to set blkio weight tunable")); + ret = -1; + } + } else { + qemuReportError(VIR_ERR_INVALID_ARG, + _("Parameter `%s' not supported"), param->field); + ret = -1; + } + } + +cleanup: + virCgroupFree(&group); + if (vm) + virDomainObjUnlock(vm); + qemuDriverUnlock(driver); + return ret; +} + +static int qemuDomainGetBlkioParameters(virDomainPtr dom, + virBlkioParameterPtr params, + int *nparams, + unsigned int flags ATTRIBUTE_UNUSED) +{ + struct qemud_driver *driver = dom->conn->privateData; + int i; + virCgroupPtr group = NULL; + virDomainObjPtr vm = NULL; + unsigned int val; + int ret = -1; + int rc; + + qemuDriverLock(driver); + + if (!qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_BLKIO)) { + qemuReportError(VIR_ERR_NO_SUPPORT, _("blkio cgroup isn't mounted")); + goto cleanup; + } + + vm = virDomainFindByUUID(&driver->domains, dom->uuid); + + if (vm == NULL) { + qemuReportError(VIR_ERR_INTERNAL_ERROR, + _("No such domain %s"), dom->uuid); + goto cleanup; + } + + if ((*nparams) == 0) { + /* Current number of blkio parameters supported by cgroups */ + *nparams = QEMU_NB_BLKIO_PARAM; + ret = 0; + goto cleanup; + } + + if ((*nparams) != QEMU_NB_BLKIO_PARAM) { + qemuReportError(VIR_ERR_INVALID_ARG, + "%s", _("Invalid parameter count")); + goto cleanup; + } + + if (virCgroupForDomain(driver->cgroup, vm->def->name, &group, 0) != 0) { + qemuReportError(VIR_ERR_INTERNAL_ERROR, + _("cannot find cgroup for domain %s"), vm->def->name); + goto cleanup; + } + + for (i = 0; i < *nparams; i++) { + virBlkioParameterPtr param = &params[i]; + val = 0; + param->value.ui = 0; + param->type = VIR_DOMAIN_BLKIO_PARAM_UINT; + + switch(i) { + case 0: /* fill blkio weight here */ + rc = virCgroupGetBlkioWeight(group, &val); + if (rc != 0) { + virReportSystemError(-rc, "%s", + _("unable to get blkio weight")); + goto cleanup; + } + if (virStrcpyStatic(param->field, VIR_DOMAIN_BLKIO_WEIGHT) == NULL) { + qemuReportError(VIR_ERR_INTERNAL_ERROR, + "%s", _("Field blkio weight too long for destination")); + goto cleanup; + } + param->value.ui = val; + break; + + default: + break; + /* should not hit here */ + } + } + + ret = 0; + +cleanup: + if (group) + virCgroupFree(&group); + if (vm) + virDomainObjUnlock(vm); + qemuDriverUnlock(driver); + return ret; +} static int qemuDomainSetMemoryParameters(virDomainPtr dom, virMemoryParameterPtr params, @@ -10502,8 +10660,8 @@ static virDriver qemuDriver = { qemuDomainSetMemoryParameters, /* domainSetMemoryParameters */ qemuDomainGetMemoryParameters, /* domainGetMemoryParameters */ qemuDomainOpenConsole, /* domainOpenConsole */ - NULL, /* domainSetBlkioParameters */ - NULL, /* domainGetBlkioParameters */ + qemuDomainSetBlkioParameters, /* domainSetBlkioParameters */ + qemuDomainGetBlkioParameters, /* domainGetBlkioParameters */ }; -- 1.7.1