[libvirt] [PATCH v2 6/7] dumpxml: query disk limits as needed for qemu

[Eric Blake]

Thanks to the recent refactoring, it is now possible to easily
update the virStorageSource associated with each disk, including
making a monitor call if necessary.  Of course, making one
monitor call per disk is not ideal, but that can be improved in
later patches.

* src/qemu/qemu_driver.c (qemuStorageLimitsRefresh): Minor tweaks
to allow NULL arguments.
(qemuDomainGetXMLDesc): Get stats on all disks.

Signed-off-by: Eric Blake <eblake at redhat.com>
---
 src/qemu/qemu_driver.c | 27 ++++++++++++++++++++++-----
 1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 7b1431b..657cd91 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -6197,11 +6197,17 @@ qemuStorageLimitsRefresh(virQEMUDriverPtr driver, virQEMUDriverConfigPtr cfg,
     char *buf = NULL;
     ssize_t len;

+    if (!path)
+        path = disk->dst;
     if (virStorageSourceIsLocalStorage(disk->src)) {
         if (!disk->src->path) {
-            virReportError(VIR_ERR_INVALID_ARG,
-                           _("disk '%s' does not currently have a source assigned"),
-                           path);
+            if (activeFail)
+                virReportError(VIR_ERR_INVALID_ARG,
+                               _("disk '%s' does not currently have a "
+                                 "source assigned"),
+                               path);
+            else
+                ret = 0;
             goto cleanup;
         }

@@ -6301,7 +6307,8 @@ qemuStorageLimitsRefresh(virQEMUDriverPtr driver, virQEMUDriverConfigPtr cfg,
          * depends on whether domain is persistent
          */
         if (!virDomainObjIsActive(vm)) {
-            *activeFail = true;
+            if (activeFail)
+                *activeFail = true;
             ret = 0;
             goto cleanup;
         }
@@ -6386,7 +6393,17 @@ static char *qemuDomainGetXMLDesc(virDomainPtr dom,
     }

     if (flags & VIR_DOMAIN_XML_BLOCK_INFO) {
-        /* FIXME run monitor commands to refresh block info */
+        size_t i;
+        virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
+
+        for (i = 0; i < vm->def->ndisks; i++) {
+            if (qemuStorageLimitsRefresh(driver, cfg, vm, vm->def->disks[i],
+                                         NULL, NULL) < 0) {
+                virObjectUnref(cfg);
+                goto endjob;
+            }
+        }
+        virObjectUnref(cfg);
     }

     if ((flags & VIR_DOMAIN_XML_MIGRATABLE))
-- 
1.9.3