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block: Introduce blk_queue_flag_{set,clear,test_and_{set,clear}}()

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Introduce functions that modify the queue flags and that protect
these modifications with the request queue lock. Except for moving
one wake_up_all() call from inside to outside a critical section,
this patch does not change any functionality.

Cc: Christoph Hellwig <[email protected]>
Cc: Hannes Reinecke <[email protected]>
Cc: Ming Lei <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Reviewed-by: Martin K. Petersen <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Bart Van Assche 2018-03-07 17:10:04 -08:00 • committed by Jens Axboe
commit 8814ce8a0f
6 changed files with 93 additions and 49 deletions
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22
block/blk-sysfs.c
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@ -276,12 +276,10 @@ queue_store_##name(struct request_queue *q, const char *page, size_t count) \
if (neg) \
val = !val; \
\
spin_lock_irq(q->queue_lock); \
if (val) \
queue_flag_set(QUEUE_FLAG_##flag, q); \
blk_queue_flag_set(QUEUE_FLAG_##flag, q); \
else \
queue_flag_clear(QUEUE_FLAG_##flag, q); \
spin_unlock_irq(q->queue_lock); \
blk_queue_flag_clear(QUEUE_FLAG_##flag, q); \
return ret; \
}
@ -414,12 +412,10 @@ static ssize_t queue_poll_store(struct request_queue *q, const char *page,
if (ret < 0)
return ret;
spin_lock_irq(q->queue_lock);
if (poll_on)
queue_flag_set(QUEUE_FLAG_POLL, q);
blk_queue_flag_set(QUEUE_FLAG_POLL, q);
else
queue_flag_clear(QUEUE_FLAG_POLL, q);
spin_unlock_irq(q->queue_lock);
blk_queue_flag_clear(QUEUE_FLAG_POLL, q);
return ret;
}
@ -487,12 +483,10 @@ static ssize_t queue_wc_store(struct request_queue *q, const char *page,
if (set == -1)
return -EINVAL;
spin_lock_irq(q->queue_lock);
if (set)
queue_flag_set(QUEUE_FLAG_WC, q);
blk_queue_flag_set(QUEUE_FLAG_WC, q);
else
queue_flag_clear(QUEUE_FLAG_WC, q);
spin_unlock_irq(q->queue_lock);
blk_queue_flag_clear(QUEUE_FLAG_WC, q);
return count;
}
@ -946,9 +940,7 @@ void blk_unregister_queue(struct gendisk *disk)
*/
mutex_lock(&q->sysfs_lock);
spin_lock_irq(q->queue_lock);
queue_flag_clear(QUEUE_FLAG_REGISTERED, q);
spin_unlock_irq(q->queue_lock);
blk_queue_flag_clear(QUEUE_FLAG_REGISTERED, q);
/*
* Remove the sysfs attributes before unregistering the queue data