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block: extend queue_flag bitops

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Add test_and_clear and test_and_set.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2008-07-03 13:18:54 +02:00
parent e180f59493
commit e48ec69005
2 changed files with 30 additions and 8 deletions
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26
include/linux/blkdev.h
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@@ -428,6 +428,32 @@ static inline void queue_flag_set_unlocked(unsigned int flag,
__set_bit(flag, &q->queue_flags);
}
static inline int queue_flag_test_and_clear(unsigned int flag,
struct request_queue *q)
{
WARN_ON_ONCE(!queue_is_locked(q));
if (test_bit(flag, &q->queue_flags)) {
__clear_bit(flag, &q->queue_flags);
return 1;
}
return 0;
}
static inline int queue_flag_test_and_set(unsigned int flag,
struct request_queue *q)
{
WARN_ON_ONCE(!queue_is_locked(q));
if (!test_bit(flag, &q->queue_flags)) {
__set_bit(flag, &q->queue_flags);
return 0;
}
return 1;
}
static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
{
WARN_ON_ONCE(!queue_is_locked(q));