Index: src/ioslaves/file/file.cpp
===================================================================
--- src/ioslaves/file/file.cpp
+++ src/ioslaves/file/file.cpp
@@ -752,8 +752,11 @@
     if (_mode != -1 && !(_flags & KIO::Resume)) {
         if (!QFile::setPermissions(dest_orig, modeToQFilePermissions(_mode))) {
             // couldn't chmod. Eat the error if the filesystem apparently doesn't support it.
-            if (tryChangeFileAttr(CHMOD, {dest_orig, _mode}, errno)) {
-                warning(i18n("Could not change permissions for\n%1",  dest_orig));
+            KMountPoint::Ptr mp = KMountPoint::currentMountPoints().findByPath(dest_orig);
+            if (mp && mp->testFileSystemFlag(KMountPoint::SupportsChmod)) {
+                if (tryChangeFileAttr(CHMOD, {dest_orig, _mode}, errno)) {
+                    warning(i18n("Could not change permissions for\n%1",  dest_orig));
+                }
             }
         }
     }
Index: src/ioslaves/file/file_unix.cpp
===================================================================
--- src/ioslaves/file/file_unix.cpp
+++ src/ioslaves/file/file_unix.cpp
@@ -351,8 +351,13 @@
         || (acl && acl_set_file(_dest.data(), ACL_TYPE_ACCESS, acl) != 0)
 #endif
        ) {
-        if (tryChangeFileAttr(CHMOD, {_dest, _mode}, errno)) {
-            warning(i18n("Could not change permissions for '%1'", dest));
+        const int errCode = errno;
+        KMountPoint::Ptr mp = KMountPoint::currentMountPoints().findByPath(dest);
+        // Eat the error if the filesystem apparently doesn't support chmod.
+        if (mp && mp->testFileSystemFlag(KMountPoint::SupportsChmod)) {
+            if (tryChangeFileAttr(CHMOD, {_dest, _mode}, errCode)) {
+                warning(i18n("Could not change permissions for '%1'", dest));
+            }
         }
     }
 #if HAVE_POSIX_ACL
@@ -789,14 +794,6 @@
         return PrivilegeOperationReturnValue::failure(errcode);
     }
 
-    if (action == CHMOD || action == CHOWN || action == UTIME) {
-        KMountPoint::Ptr mp = KMountPoint::currentMountPoints().findByPath(args.first().toString());
-        // Test for chmod and utime will return the same result as test for chown.
-        if (mp && !mp->testFileSystemFlag(KMountPoint::SupportsChown)) {
-            return PrivilegeOperationReturnValue::failure(errcode);
-        }
-    }
-
     QByteArray helperArgs;
     QDataStream out(&helperArgs, QIODevice::WriteOnly);
     out << action;