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[libvirt] [PATCH v3 3/3] 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.
---
 src/qemu/qemu_domain.c  | 31 +++++++++++++------------------
 src/qemu/qemu_process.c |  6 ------
 2 files changed, 13 insertions(+), 24 deletions(-)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index be77991..1e75adb 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);
@@ -2091,22 +2084,24 @@ qemuDomainCheckDiskPresence(virQEMUDriverPtr driver,
     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 */
-            continue;
+        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 cleanup;
     }
 
     ret = 0;
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index e8e459e..61a897c 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'.
-- 
1.8.3.1


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