1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 520e967cb501..cf152f638665 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -562,6 +562,15 @@ struct iomap_dio_ops {
  */
 #define IOMAP_DIO_FSBLOCK_ALIGNED	(1 << 3)
 
+/*
+ * Bounce buffer instead of using zero copy access.
+ *
+ * This is needed if the device needs stable data to checksum or generate
+ * parity.  The file system must hook into the I/O submission and offload
+ * completions to user context for reads when this is set.
+ */
+#define IOMAP_DIO_BOUNCE		(1 << 4)
+
 ssize_t iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
 		const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
 		unsigned int dio_flags, void *private, size_t done_before);