diff --git a/fs/smb/common/smbdirect/smbdirect_socket.h b/fs/smb/common/smbdirect/smbdirect_socket.h
index 874d4d1a56a0..b2882935a5d8 100644
--- a/fs/smb/common/smbdirect/smbdirect_socket.h
+++ b/fs/smb/common/smbdirect/smbdirect_socket.h
@@ -734,4 +734,10 @@ struct smbdirect_rw_io {
 	struct scatterlist sg_list[];
 };
 
+static inline size_t smbdirect_get_buf_page_count(const void *buf, size_t size)
+{
+	return DIV_ROUND_UP((uintptr_t)buf + size, PAGE_SIZE) -
+		(uintptr_t)buf / PAGE_SIZE;
+}
+
 #endif /* __FS_SMB_COMMON_SMBDIRECT_SMBDIRECT_SOCKET_H__ */