From: J. Bruce Fields <bfields@citi.umich.edu>
Date: Sat, 5 Jun 2010 00:04:45 +0000 (-0400)
Subject: nfsd4: Move callback setup to callback queue
X-Git-Tag: v2.6.37-rc1~113^2~51
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6ff8da088766d70f0441feb982b82978a6cbf7ef;p=pandora-kernel.git

nfsd4: Move callback setup to callback queue

Instead of creating the new rpc client from a regular server thread,
set a flag, kick off a null call, and allow the null call to do the work
of setting up the client on the callback workqueue.

Use a spinlock to ensure the callback work gets a consistent view of the
callback parameters.

This allows, for example, changing the callback from contexts where
sleeping is not allowed.  I hope it will also keep the locking simple as
we add more session and trunking features, by serializing most of the
callback-specific work.

This also closes a small race where the the new cb_ident could be used
with an old connection (or vice-versa).

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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