nfs: add a helper to set NFS_ODIRECT_RESCHED_WRITES to direct writes

To allow pnfs LD to ask direct writes to be resend.

Signed-off-by: Peng Tao <tao.peng@primarydata.com>
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index eb81478..4fad6b7 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -116,6 +116,12 @@
 	return atomic_dec_and_test(&dreq->io_count);
 }
 
+void nfs_direct_set_resched_writes(struct nfs_direct_req *dreq)
+{
+	dreq->flags = NFS_ODIRECT_RESCHED_WRITES;
+}
+EXPORT_SYMBOL_GPL(nfs_direct_set_resched_writes);
+
 static void
 nfs_direct_good_bytes(struct nfs_direct_req *dreq, struct nfs_pgio_header *hdr)
 {