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Commit 9a8ac3ae authored by Bart Van Assche's avatar Bart Van Assche Committed by Mike Snitzer
Browse files

dm mpath: cleanup QUEUE_IF_NO_PATH bit manipulation by introducing assign_bit() 



No functional change but makes the code easier to read.

Signed-off-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
parent ca5beb76

drivers/md/dm-mpath.c

+15 −21
Original line number Diff line number Diff line
@@ -612,6 +612,14 @@ static void process_queued_bios(struct work_struct *work) 
	blk_finish_plug(&plug);

}



static void assign_bit(bool value, long nr, unsigned long *addr)

{

	if (value)

		set_bit(nr, addr);

	else

		clear_bit(nr, addr);

}



/*

 * If we run out of usable paths, should we queue I/O or error it?

 */
@@ -621,23 +629,11 @@ static int queue_if_no_path(struct multipath *m, bool queue_if_no_path, 
	unsigned long flags;



	spin_lock_irqsave(&m->lock, flags);



	if (save_old_value) {

		if (test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags))

			set_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags);

		else

			clear_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags);

	} else {

		if (queue_if_no_path)

			set_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags);

		else

			clear_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags);

	}

	if (queue_if_no_path || dm_noflush_suspending(m->ti))

		set_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags);

	else

		clear_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags);



	assign_bit((save_old_value && test_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags)) ||

		   (!save_old_value && queue_if_no_path),

		   MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags);

	assign_bit(queue_if_no_path || dm_noflush_suspending(m->ti),

		   MPATHF_QUEUE_IF_NO_PATH, &m->flags);

	spin_unlock_irqrestore(&m->lock, flags);



	if (!queue_if_no_path) {
@@ -1589,10 +1585,8 @@ static void multipath_resume(struct dm_target *ti) 
	unsigned long flags;



	spin_lock_irqsave(&m->lock, flags);

	if (test_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags))

		set_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags);

	else

		clear_bit(MPATHF_QUEUE_IF_NO_PATH, &m->flags);

	assign_bit(test_bit(MPATHF_SAVED_QUEUE_IF_NO_PATH, &m->flags),

		   MPATHF_QUEUE_IF_NO_PATH, &m->flags);

	spin_unlock_irqrestore(&m->lock, flags);

}