Make the vnode opv vector construction fully dynamic. Previously we

leaked memory on each unload and were limited to items referenced in
the kernel copy of vnode_if.c.  Now a kernel module is free to create
it's own VOP_FOO() routines and the rest of the system will happily
deal with it, including passthrough layers like union/umap/etc.

Have VFS_SET() call a common vfs_modevent() handler rather than
inline duplicating the common code all over the place.

Have VNODEOP_SET() have the vnodeops removed at unload time (assuming a
module) so that the vop_t ** vector is reclaimed.

Slightly adjust the vop_t ** vectors so that calling slot 0 is a panic
rather than a page fault.  This could happen if VOP_something() was called
without *any* handlers being present anywhere (including in vfs_default.c).
slot 1 becomes the default vector for the vnodeop table.

TODO: reclaim zones on unload (eg: nfs code)

1 files changed, 7 insertions, 0 deletions

diff --git a/sys/kern/vfs_default.c b/sys/kern/vfs_default.c
index 538cbc0..47545c3 100644
--- a/sys/kern/vfs_default.c
+++ b/sys/kern/vfs_default.c
@@ -130,6 +130,13 @@ vop_defaultop(struct vop_generic_args *ap)
 	return (VOCALL(default_vnodeop_p, ap->a_desc->vdesc_offset, ap));
 }
 
+int
+vop_panic(struct vop_generic_args *ap)
+{
+
+	panic("illegal vnode op called");
+}
+
 static int
 vop_nostrategy (struct vop_strategy_args *ap)
 {