1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index b3700f0ac268..3e2925a34bf0 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -41,6 +41,26 @@
 
 #include <linux/types.h>
 
+/*
+ * Version negotiation:
+ *
+ * Both the kernel and userspace send the version they support in the
+ * INIT request and reply respectively.
+ *
+ * If the major versions match then both shall use the smallest
+ * of the two minor versions for communication.
+ *
+ * If the kernel supports a larger major version, then userspace shall
+ * reply with the major version it supports, ignore the rest of the
+ * INIT message and expect a new INIT message from the kernel with a
+ * matching major version.
+ *
+ * If the library supports a larger major version, then it shall fall
+ * back to the major protocol version sent by the kernel for
+ * communication and reply with that major version (and an arbitrary
+ * supported minor version).
+ */
+
 /** Version number of this interface */
 #define FUSE_KERNEL_VERSION 7