9ns: Add tree_chan_ctl()
authorBarret Rhoden <brho@cs.berkeley.edu>
Mon, 30 Jul 2018 15:33:51 +0000 (11:33 -0400)
committerBarret Rhoden <brho@cs.berkeley.edu>
Mon, 30 Jul 2018 20:06:25 +0000 (16:06 -0400)
This provides a default operation (right now, just errors) for tree file
systems.

Signed-off-by: Barret Rhoden <brho@cs.berkeley.edu>

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