From: Christoph Hellwig <hch@lst.de>
Date: Wed, 3 Dec 2008 11:20:28 +0000 (+0100)
Subject: reduce l_icloglock roundtrips
X-Git-Tag: v2.6.29-rc1~552^2~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=39e2defe73106ca2e1c85e5286038a0a13f49513;p=pandora-kernel.git

reduce l_icloglock roundtrips

All but one caller of xlog_state_want_sync drop and re-acquire
l_icloglock around the call to it, just so that xlog_state_want_sync can
acquire and drop it.

Move all lock operation out of l_icloglock and assert that the lock is
held when it is called.

Note that it would make sense to extende this scheme to
xlog_state_release_iclog, but the locking in there is more complicated
and we'd like to keep the atomic_dec_and_lock optmization for those
callers not having l_icloglock yet.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
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