conf: Move and optimize disk target duplicity checking

Move the logic from virDomainDiskDefDstDuplicates into
virDomainDiskDefCheckDuplicateInfo so that we don't have to loop
multiple times through the array of disks. Since the original function
was called in qemuBuildDriveDevStr, it was actually called for every
single disk which was quite wasteful.

Additionally the target uniqueness check needed to be duplicated in
the disk hotplug case, since the disk was inserted into the domain
definition after the device string was formatted and thus
virDomainDiskDefDstDuplicates didn't do anything in that case.

src/conf/domain_conf.c

@@ -12992,31 +12992,6 @@ virDomainDiskControllerMatch(int controller_type, int disk_bus)
     return false;
 }
 
-/* Return true if there's a duplicate disk[]->dst name for the same bus */
-bool
-virDomainDiskDefDstDuplicates(virDomainDefPtr def)
-{
-    size_t i, j;
-
-    /* optimization */
-    if (def->ndisks <= 1)
-        return false;
-
-    for (i = 1; i < def->ndisks; i++) {
-        for (j = 0; j < i; j++) {
-            if (STREQ(def->disks[i]->dst, def->disks[j]->dst)) {
-                virReportError(VIR_ERR_XML_ERROR,
-                               _("target '%s' duplicated for disk sources "
-                                 "'%s' and '%s'"),
-                               def->disks[i]->dst,
-                               NULLSTR(virDomainDiskGetSource(def->disks[i])),
-                               NULLSTR(virDomainDiskGetSource(def->disks[j])));
-                return true;
-            }
-        }
-    }
-    return false;
-}
 
 int
 virDomainDiskIndexByAddress(virDomainDefPtr def,
@@ -23992,6 +23967,15 @@ int
 virDomainDiskDefCheckDuplicateInfo(virDomainDiskDefPtr a,
                                    virDomainDiskDefPtr b)
 {
+    if (STREQ(a->dst, b->dst)) {
+        virReportError(VIR_ERR_XML_ERROR,
+                       _("target '%s' duplicated for disk sources '%s' and '%s'"),
+                       a->dst,
+                       NULLSTR(virDomainDiskGetSource(a)),
+                       NULLSTR(virDomainDiskGetSource(b)));
+        return -1;
+    }
+
     if (a->wwn && b->wwn && STREQ(a->wwn, b->wwn)) {
         virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
                        _("Disks '%s' and '%s' have identical WWN"),
@@ -24017,14 +24001,12 @@ virDomainDefCheckDuplicateDiskInfo(virDomainDefPtr def)
     size_t j;
 
     for (i = 0; i < def->ndisks; i++) {
-        if (def->disks[i]->wwn || def->disks[i]->serial) {
         for (j = i + 1; j < def->ndisks; j++) {
             if (virDomainDiskDefCheckDuplicateInfo(def->disks[i],
                                                    def->disks[j]) < 0)
                 return -1;
         }
     }
-    }
 
     return 0;
 }

src/conf/domain_conf.h

@@ -2770,7 +2770,6 @@ int virDomainDefCompatibleDevice(virDomainDefPtr def,
 
 void virDomainRNGDefFree(virDomainRNGDefPtr def);
 
-bool virDomainDiskDefDstDuplicates(virDomainDefPtr def);
 int virDomainDiskIndexByAddress(virDomainDefPtr def,
                                 virDevicePCIAddressPtr pci_controller,
                                 unsigned int bus, unsigned int target,

src/libvirt_private.syms

@@ -258,7 +258,6 @@ virDomainDiskCacheTypeFromString;
 virDomainDiskCacheTypeToString;
 virDomainDiskDefAssignAddress;
 virDomainDiskDefCheckDuplicateInfo;
-virDomainDiskDefDstDuplicates;
 virDomainDiskDefForeachPath;
 virDomainDiskDefFree;
 virDomainDiskDefNew;

src/qemu/qemu_command.c

@@ -4228,9 +4228,6 @@ qemuBuildDriveDevStr(virDomainDefPtr def,
     const char *contAlias;
     int controllerModel;
 
-    if (virDomainDiskDefDstDuplicates(def))
-        goto error;
-
     if (qemuCheckDiskConfig(disk) < 0)
         goto error;
 

src/qemu/qemu_driver.c

@@ -7278,6 +7278,9 @@ static char *qemuConnectDomainXMLToNative(virConnectPtr conn,
     if (!(qemuCaps = virQEMUCapsCacheLookup(driver->qemuCapsCache, def->emulator)))
         goto cleanup;
 
+    if (qemuProcessStartValidate(def, qemuCaps, false, false) < 0)
+        goto cleanup;
+
     /* Since we're just exporting args, we can't do bridge/network/direct
      * setups, since libvirt will normally create TAP/macvtap devices
      * directly. We convert those configs into generic 'ethernet'

src/qemu/qemu_hotplug.c

@@ -794,12 +794,6 @@ qemuDomainAttachDeviceDiskLive(virConnectPtr conn,
     case VIR_DOMAIN_DISK_DEVICE_DISK:
     case VIR_DOMAIN_DISK_DEVICE_LUN:
         for (i = 0; i < vm->def->ndisks; i++) {
-            if (STREQ(vm->def->disks[i]->dst, disk->dst)) {
-                virReportError(VIR_ERR_OPERATION_FAILED,
-                               _("target %s already exists"), disk->dst);
-                goto cleanup;
-            }
-
             if (virDomainDiskDefCheckDuplicateInfo(vm->def->disks[i], disk) < 0)
                 goto cleanup;
         }