From: Marc Eshel <eshel@almaden.ibm.com>
Date: Tue, 28 Nov 2006 21:27:06 +0000 (-0500)
Subject: lockd: add code to handle deferred lock requests
X-Git-Tag: v2.6.22-rc1~818^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1a8322b2b02071b0c7ac37a28357b93e6362f13e;p=pandora-kernel.git

lockd: add code to handle deferred lock requests

Rewrite nlmsvc_lock() to use the asynchronous interface.

As with testlock, we answer nlm requests in nlmsvc_lock by first looking up
the block and then using the results we find in the block if B_QUEUED is
set, and calling vfs_lock_file() otherwise.

If this a new lock request and we get -EINPROGRESS return on a non-blocking
request then we defer the request.

Also modify nlmsvc_unlock() to call the filesystem method if appropriate.

Signed-off-by: Marc Eshel <eshel@almaden.ibm.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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