From: Venkateswararao Jujjuri (JV) <jvrao@linux.vnet.ibm.com>
Date: Fri, 28 Jan 2011 22:11:13 +0000 (-0800)
Subject: [net/9p] Preparation and helper functions for zero copy
X-Git-Tag: v2.6.39-rc1~489^2~40
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=022cae36551ba805bf82084047945b2901d75f36;p=pandora-kernel.git

[net/9p] Preparation and helper functions for zero copy

This patch prepares p9_fcall structure for zero copy. Added
fields send the payload buffer information to the transport layer.
In addition it adds a 'private' field for the transport layer to
store mapped/pinned page information so that it can be freed/unpinned
during req_done.

This patch also creates trans_common.[ch] to house helper functions.
It adds the following helper functions.

p9_release_req_pages - Release pages after the transaction.
p9_nr_pages - Return number of pages needed to accomodate the payload.
payload_gup - Translates user buffer into kernel pages.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>
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