NFS: Ignore the directory size when marking for revalidation

If we want to revalidate the directory, then just mark the change
attribute as invalid.

Fixes: 13c0b08 ("NFS: Replace use of NFS_INO_REVAL_PAGECACHE when checking cache validity")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Tested-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>

fs/nfs/dir.c

@@ -1413,7 +1413,7 @@ int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags)
 static void nfs_mark_dir_for_revalidate(struct inode *inode)
 {
 	spin_lock(&inode->i_lock);
-	nfs_set_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE);
+	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
 	spin_unlock(&inode->i_lock);
 }