From: Jan Kara <jack@suse.cz>
Date: Wed, 25 Apr 2012 19:15:53 +0000 (+0200)
Subject: quota: Get rid of nested I_MUTEX_QUOTA locking subclass
X-Git-Tag: v3.5-rc1~87^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a80b12c3d08dbbf15e6a551e481c32a2df4911f3;p=pandora-kernel.git

quota: Get rid of nested I_MUTEX_QUOTA locking subclass

So far i_mutex was ranking above dqonoff_mutex and i_mutex on quota files
was special and ranking below dqonoff_mutex (and several other locks).
However there's no real need for i_mutex on quota files to be special.
IO on quota files is serialized by dqio_mutex anyway so we don't need to
take i_mutex when writing to quota files. Other places where we take i_mutex
on quota file can accomodate standard i_mutex lock ranking, we only need
to change the lock ranking to be dqonoff_mutex > i_mutex which is a matter
of changing documentation because there's no place which would enforce
ordering in the other direction.

Signed-off-by: Jan Kara <jack@suse.cz>
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