From: Guannan Ren <gren@redhat.com>
Date: Wed, 31 Jul 2013 07:55:05 +0000 (+0800)
Subject: qemu: check presence of each disk and its backing file as well
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=dbca8414577a0d76a5bad9eb5919130db7bc451f;p=libvirt.git

qemu: check presence of each disk and its backing file as well

For disk with startupPolicy support, such as cdrom and floppy
when its chain is broken, the startup policy will apply,
otherwise, report an error.
---

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index be779918bd..1ff802ce59 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -2043,19 +2043,11 @@ qemuDomainCheckDiskStartupPolicy(virQEMUDriverPtr driver,
             break;
 
         case VIR_DOMAIN_STARTUP_POLICY_MANDATORY:
-            virReportSystemError(errno,
-                                 _("cannot access file '%s'"),
-                                 disk->src);
             goto error;
-            break;
 
         case VIR_DOMAIN_STARTUP_POLICY_REQUISITE:
-            if (cold_boot) {
-                virReportSystemError(errno,
-                                     _("cannot access file '%s'"),
-                                     disk->src);
+            if (cold_boot)
                 goto error;
-            }
             break;
 
         case VIR_DOMAIN_STARTUP_POLICY_DEFAULT:
@@ -2064,6 +2056,7 @@ qemuDomainCheckDiskStartupPolicy(virQEMUDriverPtr driver,
             break;
     }
 
+    virResetLastError();
     VIR_DEBUG("Dropping disk '%s' on domain '%s' (UUID '%s') "
               "due to inaccessible source '%s'",
               disk->dst, vm->def->name, uuid, disk->src);
@@ -2089,30 +2082,30 @@ qemuDomainCheckDiskPresence(virQEMUDriverPtr driver,
     int ret = -1;
     size_t i;
     virDomainDiskDefPtr disk;
-    virQEMUDriverConfigPtr cfg = virQEMUDriverGetConfig(driver);
 
+    VIR_DEBUG("Checking for disk presence");
     for (i = 0; i < vm->def->ndisks; i++) {
         disk = vm->def->disks[i];
 
-        if (!disk->startupPolicy || !disk->src)
+        if (!disk->src)
             continue;
 
-        if (virFileAccessibleAs(disk->src, F_OK,
-                                cfg->user,
-                                cfg->group) >= 0) {
-            /* disk accessible */
+        if (qemuDomainDetermineDiskChain(driver, disk, false) >= 0 &&
+            qemuDiskChainCheckBroken(disk) >= 0)
             continue;
+
+        if (disk->startupPolicy) {
+            if (qemuDomainCheckDiskStartupPolicy(driver, vm, disk,
+                                                 cold_boot) >= 0)
+                continue;
         }
 
-        if (qemuDomainCheckDiskStartupPolicy(driver, vm, disk,
-                                             cold_boot) < 0)
-            goto cleanup;
+        goto error;
     }
 
     ret = 0;
 
-cleanup:
-    virObjectUnref(cfg);
+error:
     return ret;
 }
 
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index d631a6f718..0dccac3438 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3621,16 +3621,10 @@ int qemuProcessStart(virConnectPtr conn,
     if (qemuAssignDeviceAliases(vm->def, priv->qemuCaps) < 0)
         goto cleanup;
 
-    VIR_DEBUG("Checking for CDROM and floppy presence");
     if (qemuDomainCheckDiskPresence(driver, vm,
                                     flags & VIR_QEMU_PROCESS_START_COLD) < 0)
         goto cleanup;
 
-    for (i = 0; i < vm->def->ndisks; i++) {
-        if (qemuDomainDetermineDiskChain(driver, vm->def->disks[i],
-                                         false) < 0)
-            goto cleanup;
-    }
 
     /* Get the advisory nodeset from numad if 'placement' of
      * either <vcpu> or <numatune> is 'auto'.