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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: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Bart Van Assche 2017-04-27 10:11:25 -07:00 committed by Mike Snitzer
parent ca5beb76c3
commit 9a8ac3ae68
1 changed files with 15 additions and 21 deletions
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36
drivers/md/dm-mpath.c
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@ -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);
}