On 14.02.2014 18:49, Thorsten Behrens wrote:
Adds lxcDomainBlockStatsFlags and lxcDomainBlockStats functions.
---
src/lxc/lxc_driver.c | 195 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 195 insertions(+)
diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index e31b3ac..e1fcceb 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -76,6 +76,7 @@
#define LXC_NB_MEM_PARAM 3
+#define LXC_NB_DOMAIN_BLOCK_STAT_PARAM 4
static int lxcStateInitialize(bool privileged,
@@ -2230,6 +2231,198 @@ lxcDomainMergeBlkioDevice(virBlkioDevicePtr *dest_array,
static int
+lxcDomainBlockStats(virDomainPtr dom,
+ const char *path,
+ struct _virDomainBlockStats *stats)
+{
+ int ret = -1, idx;
+ virDomainObjPtr vm;
+ virDomainDiskDefPtr disk = NULL;
+ virLXCDomainObjPrivatePtr priv;
+
+ if (!(vm = lxcDomObjFromDomain(dom)))
+ return ret;
+
+ priv = vm->privateData;
+
+ if (virDomainBlockStatsEnsureACL(dom->conn, vm->def) < 0)
+ goto cleanup;
+
+ if (!virDomainObjIsActive(vm)) {
+ virReportError(VIR_ERR_OPERATION_INVALID,
+ "%s", _("domain is not running"));
+ goto cleanup;
+ }
+
+ if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_BLKIO)) {
+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+ _("blkio cgroup isn't mounted"));
+ goto cleanup;
+ }
+
+ if (!*path) {
....
+ /* empty path - return entire domain blkstats instead */
+ ret = virCgroupGetBlkioIoServiced(priv->cgroup,
+ &stats->rd_bytes,
+ &stats->wr_bytes,
+ &stats->rd_req,
+ &stats->wr_req);
+ goto cleanup;
+ }
+
+ if ((idx = virDomainDiskIndexByName(vm->def, path, false)) < 0) {
+ virReportError(VIR_ERR_INVALID_ARG,
+ _("invalid path: %s"), path);
+ goto cleanup;
+ }
+ disk = vm->def->disks[idx];
+
+ if (!disk->info.alias) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("missing disk device alias name for %s"), disk->dst);
+ goto cleanup;
+ }
+
+ ret = virCgroupGetBlkioIoDeviceServiced(priv->cgroup,
+ disk->info.alias,
+ &stats->rd_bytes,
+ &stats->wr_bytes,
+ &stats->rd_req,
+ &stats->wr_req);
+cleanup:
+ if (vm)
+ virObjectUnlock(vm);
+ return ret;
+}
+
+
+static int
+lxcDomainBlockStatsFlags(virDomainPtr dom,
+ const char * path,
+ virTypedParameterPtr params,
+ int * nparams,
+ unsigned int flags)
+{
+ int tmp, ret = -1, idx;
+ virDomainObjPtr vm;
+ virDomainDiskDefPtr disk = NULL;
+ virLXCDomainObjPrivatePtr priv;
+ long long rd_req, rd_bytes, wr_req, wr_bytes;
+ virTypedParameterPtr param;
+
+ virCheckFlags(VIR_TYPED_PARAM_STRING_OKAY, -1);
+
+ /* We don't return strings, and thus trivially support this flag. */
+ flags &= ~VIR_TYPED_PARAM_STRING_OKAY;
+
+ if (!params && !*nparams) {
+ *nparams = LXC_NB_DOMAIN_BLOCK_STAT_PARAM;
+ return 0;
+ }
+
+ if (!(vm = lxcDomObjFromDomain(dom)))
+ return ret;
+
+ priv = vm->privateData;
+
+ if (virDomainBlockStatsFlagsEnsureACL(dom->conn, vm->def) < 0)
+ goto cleanup;
+
+ if (!virDomainObjIsActive(vm)) {
+ virReportError(VIR_ERR_OPERATION_INVALID,
+ "%s", _("domain is not running"));
+ goto cleanup;
+ }
+
+ if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_BLKIO)) {
+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+ _("blkio cgroup isn't mounted"));
+ goto cleanup;
+ }
+
+ if (!*path) {
Okay, we allow passing "" as path. But only via C API, not in virsh. So
I guess this is still okay - esp. if a quick look at the very next patch
address the virsh part of my concern. Although, the documentation to
these APIs don't mention passing empty string - which again you're
fixing in the next patch. I think I can overlook fact that it should be
in this patch (or the order of these two patches should be reversed).
+ /* empty path - return entire domain blkstats instead */
+ if (virCgroupGetBlkioIoServiced(priv->cgroup,
+ &rd_bytes,
+ &wr_bytes,
+ &rd_req,
+ &wr_req) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ "%s", _("domain stats query failed"));
+ goto cleanup;
+ }
+ } else {
+ if ((idx = virDomainDiskIndexByName(vm->def, path, false)) < 0) {
+ virReportError(VIR_ERR_INVALID_ARG,
+ _("invalid path: %s"), path);
+ goto cleanup;
+ }
+ disk = vm->def->disks[idx];
+
+ if (!disk->info.alias) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("missing disk device alias name for %s"),
disk->dst);
+ goto cleanup;
+ }
+
+ if (virCgroupGetBlkioIoDeviceServiced(priv->cgroup,
+ disk->info.alias,
+ &rd_bytes,
+ &wr_bytes,
+ &rd_req,
+ &wr_req) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ "%s", _("domain stats query failed"));
+ goto cleanup;
+ }
+ }
Michal
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