From: Weston Andros Adamson <dros@primarydata.com>
Date: Fri, 8 Aug 2014 15:00:54 +0000 (-0400)
Subject: nfs: fix nonblocking calls to nfs_page_group_lock
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~12^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bc8a309e88a86205fc3e17f06e42a2e56fc6f807;p=pandora-kernel.git

nfs: fix nonblocking calls to nfs_page_group_lock

nfs_page_group_lock was calling wait_on_bit_lock even when told not to
block. Fix by first trying test_and_set_bit, followed by wait_on_bit_lock
if and only if blocking is allowed.  Return -EAGAIN if nonblocking and the
test_and_set of the bit was already locked.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>
Reviewed-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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