Vnode namespace - split sys/vnode.h

["J. Hannken-Illjes" <hannken%eis.cs.tu-bs.de@localhost>]

Its time to split sys/vnode.h into sys/vnode.h and sys/vnode_impl.h.
 
The latter holds implementation details about the vnode life cycle
and must be included only from kern/vfs_*, miscfs/genfs/* and miscfs/specfs/*.
 
It is sufficient to include vnode_impl.h, it already includes sys/vnode.h.

1) Rename the vcache node to vnode_impl: 
- Rename struct vcache_node to vnode_impl, start its fields with vi_.  
- Rename enum vcache_state to vnode_state, start its elements with VS_.
- Rename macros VN_TO_VP and VP_TO_VN to VIMPL_TO_VNODE and VNODE_TO_VIMPL.
- Add typedef struct vnode_impl vnode_impl_t.

2) The actual split:
- Split sys/vnode.h into vnode.h and vnode_impl.h.
- Move _VFS_VNODE_PRIVATE protected operations into vnode_impl.h.
- Move struct vnode_impl definition and operations into vnode_impl.h.
- Include vnode_impl.h where we include vnode.h with _VFS_VNODE_PRIVATE defined.
- Get rid of _VFS_VNODE_PRIVATE.

3) Vnode printing:
- Add a function to print the fields of a vnode including its implementation.
- Use it from vprint() and vfs_vnode_print().
- Move vstate_name() to vfs_subr.c.

The diffs are here: http://www.netbsd.org/~hannken/vrename/

Comments or objections anyone?

--
J. Hannken-Illjes - hannken%eis.cs.tu-bs.de@localhost - TU Braunschweig (Germany)