storage: pool: Allow more intricate nfs protocol versions

Treat the 'protocolVer' field as a string so that e.g. '4.1' can be
used. Forbid only ',' in the string as it's a separator of arguments for
mount options.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

docs/formatstorage.rst

@@ -350,7 +350,7 @@ following child elements:
 ``protocol``
    For a ``netfs`` Storage Pool provide a mechanism to define which NFS protocol
    version number will be used to contact the server's NFS service. The
-   attribute ``ver`` accepts an unsigned integer as the version number to use.
+   attribute ``ver`` accepts the version number to use.
    :since:`Since 5.1.0`
 ``vendor``
    Provides optional information about the vendor of the storage device. This

src/conf/schemas/storagepool.rng

@@ -577,9 +577,7 @@
             <ref name="sourcefmtnetfs"/>
             <optional>
               <element name="protocol">
-                <attribute name="ver">
-                  <ref name="unsignedInt"/>
-                </attribute>
+                <attribute name="ver"/>
               </element>
             </optional>
             <optional>

src/conf/storage_conf.c

@@ -483,6 +483,7 @@ virStoragePoolSourceClear(virStoragePoolSource *source)
     virStorageAuthDefFree(source->auth);
     VIR_FREE(source->vendor);
     VIR_FREE(source->product);
+    VIR_FREE(source->protocolVer);
 }
 
 
@@ -526,7 +527,6 @@ virStoragePoolDefParseSource(xmlXPathContextPtr ctxt,
     virStoragePoolOptions *options;
     int n;
     g_autoptr(virStorageAuthDef) authdef = NULL;
-    g_autofree char *ver = NULL;
     g_autofree xmlNodePtr *nodeset = NULL;
     g_autofree char *sourcedir = NULL;
     VIR_XPATH_NODE_AUTORESTORE(ctxt)
@@ -634,7 +634,7 @@ virStoragePoolDefParseSource(xmlXPathContextPtr ctxt,
     }
 
     /* Option protocol version string (NFSvN) */
-    if ((ver = virXPathString("string(./protocol/@ver)", ctxt))) {
+    if ((source->protocolVer = virXPathString("string(./protocol/@ver)", ctxt))) {
         if ((source->format != VIR_STORAGE_POOL_NETFS_NFS) &&
             (source->format != VIR_STORAGE_POOL_NETFS_AUTO)) {
             virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
@@ -643,10 +643,11 @@ virStoragePoolDefParseSource(xmlXPathContextPtr ctxt,
                            virStoragePoolFormatFileSystemNetTypeToString(source->format));
             return -1;
         }
-        if (virStrToLong_uip(ver, NULL, 0, &source->protocolVer) < 0) {
-            virReportError(VIR_ERR_XML_ERROR,
-                           _("storage pool protocol ver '%s' is malformed"),
-                           ver);
+
+        if (strchr(source->protocolVer, ',')) {
+            virReportError(VIR_ERR_XML_DETAIL,
+                           _("storage pool protocol ver '%s' must not contain ','"),
+                           source->protocolVer);
             return -1;
         }
     }
@@ -1099,9 +1100,7 @@ virStoragePoolSourceFormat(virBuffer *buf,
     if (src->auth)
         virStorageAuthDefFormat(buf, src->auth);
 
-    if (src->protocolVer)
-        virBufferAsprintf(buf, "<protocol ver='%u'/>\n", src->protocolVer);
-
+    virBufferEscapeString(buf, "<protocol ver='%s'/>\n", src->protocolVer);
     virBufferEscapeString(buf, "<vendor name='%s'/>\n", src->vendor);
     virBufferEscapeString(buf, "<product name='%s'/>\n", src->product);
 

src/conf/storage_conf.h

@@ -213,7 +213,7 @@ struct _virStoragePoolSource {
     int format;
 
     /* Protocol version value for netfs */
-    unsigned int protocolVer;
+    char *protocolVer;
 };
 
 typedef struct _virStoragePoolTarget virStoragePoolTarget;

src/storage/storage_util.c

@@ -4201,8 +4201,8 @@ virStorageBackendFileSystemMountCmd(const char *cmdstr,
     virCommand *cmd = NULL;
     g_autofree char *nfsVers = NULL;
 
-    if (def->type == VIR_STORAGE_POOL_NETFS && def->source.protocolVer > 0)
-        nfsVers = g_strdup_printf("nfsvers=%u", def->source.protocolVer);
+    if (def->type == VIR_STORAGE_POOL_NETFS && def->source.protocolVer)
+        nfsVers = g_strdup_printf("nfsvers=%s", def->source.protocolVer);
 
     cmd = virCommandNew(cmdstr);
     if (netauto)

tests/storagepoolxml2argvdata/pool-netfs-protocol-ver-linux.argv

@@ -1,5 +1,5 @@
 mount \
--o nodev,nosuid,noexec,nfsvers=3 \
+-o nodev,nosuid,noexec,nfsvers=4.1 \
 -t nfs \
 localhost:/var/lib/libvirt/images \
 /mnt

tests/storagepoolxml2xmlin/pool-netfs-protocol-ver.xml

@@ -8,7 +8,7 @@
     <host name='localhost'/>
     <dir path='/var/lib/libvirt/images'/>
     <format type='nfs'/>
-    <protocol ver='3'/>
+    <protocol ver='4.1'/>
   </source>
   <target>
     <path>/mnt</path>

tests/storagepoolxml2xmlout/pool-netfs-protocol-ver.xml

@@ -8,7 +8,7 @@
     <host name='localhost'/>
     <dir path='/var/lib/libvirt/images'/>
     <format type='nfs'/>
-    <protocol ver='3'/>
+    <protocol ver='4.1'/>
   </source>
   <target>
     <path>/mnt</path>