quota: provide function to grab quota structure reference
Provide dqgrab() function to get quota structure reference when we are sure it already has at least one active reference. Make use of this function inside quota code. Signed-off-by: NJan Kara <jack@suse.cz> Reviewed-by: NMark Fasheh <mfasheh@suse.de> Reviewed-by: NSrinivas Eeda <srinivas.eeda@oracle.com> Cc: Joel Becker <jlbec@evilplan.org> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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