From: Christoph Hellwig <hch@infradead.org>
Date: Tue, 27 Mar 2012 14:34:46 +0000 (-0400)
Subject: xfs: avoid taking the ilock unnessecarily in xfs_qm_dqattach
X-Git-Tag: v3.5-rc1~91^2~53
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b4d05e3019692fc5a8c573fbce60de2d48c5b7a1;p=pandora-kernel.git

xfs: avoid taking the ilock unnessecarily in xfs_qm_dqattach

Check if we actually need to attach a dquot before taking the ilock in
xfs_qm_dqattach.  This avoid superflous lock roundtrips for the common cases
of quota support compiled in but not activated on a filesystem and an
inode that already has the dquots attached.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
---

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