1 files changed, 12 insertions, 0 deletions

diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
index c0565a44a2a0f..de5d18d80e98e 100644
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -138,6 +138,18 @@ vop_panic(struct vop_generic_args *ap)
 	panic("illegal vnode op called");
 }
 
+/*
+ *	vop_nostrategy:
+ *
+ *	Strategy routine for VFS devices that have none.
+ *
+ *	B_ERROR and B_INVAL must be cleared prior to calling any strategy
+ *	routine.  Typically this is done for a B_READ strategy call.  Typically
+ *	B_INVAL is assumed to already be clear prior to a write and should not
+ *	be cleared manually unless you just made the buffer invalid.  B_ERROR
+ *	should be cleared either way.
+ */
+
 static int
 vop_nostrategy (struct vop_strategy_args *ap)
 {