From: Bart Van Assche Date: Thu, 8 Mar 2018 01:10:12 +0000 (-0800) Subject: block: Move the queue_flag_*() functions from a public into a private header file X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=8a0ac14b8da9b86cfbe7aace40c8d485ed5c5b97;p=linux.git block: Move the queue_flag_*() functions from a public into a private header file This patch helps to avoid that new code gets introduced in block drivers that manipulates queue flags without holding the queue lock when that lock should be held. Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Ming Lei Reviewed-by: Johannes Thumshirn Reviewed-by: Martin K. Petersen Signed-off-by: Bart Van Assche Signed-off-by: Jens Axboe --- diff --git a/block/blk.h b/block/blk.h index 46db5dc83dcb4..b034fd2460c41 100644 --- a/block/blk.h +++ b/block/blk.h @@ -41,6 +41,75 @@ extern struct kmem_cache *request_cachep; extern struct kobj_type blk_queue_ktype; extern struct ida blk_queue_ida; +/* + * @q->queue_lock is set while a queue is being initialized. Since we know + * that no other threads access the queue object before @q->queue_lock has + * been set, it is safe to manipulate queue flags without holding the + * queue_lock if @q->queue_lock == NULL. See also blk_alloc_queue_node() and + * blk_init_allocated_queue(). + */ +static inline void queue_lockdep_assert_held(struct request_queue *q) +{ + if (q->queue_lock) + lockdep_assert_held(q->queue_lock); +} + +static inline void queue_flag_set_unlocked(unsigned int flag, + struct request_queue *q) +{ + if (test_bit(QUEUE_FLAG_INIT_DONE, &q->queue_flags) && + kref_read(&q->kobj.kref)) + lockdep_assert_held(q->queue_lock); + __set_bit(flag, &q->queue_flags); +} + +static inline void queue_flag_clear_unlocked(unsigned int flag, + struct request_queue *q) +{ + if (test_bit(QUEUE_FLAG_INIT_DONE, &q->queue_flags) && + kref_read(&q->kobj.kref)) + lockdep_assert_held(q->queue_lock); + __clear_bit(flag, &q->queue_flags); +} + +static inline int queue_flag_test_and_clear(unsigned int flag, + struct request_queue *q) +{ + queue_lockdep_assert_held(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) +{ + queue_lockdep_assert_held(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) +{ + queue_lockdep_assert_held(q); + __set_bit(flag, &q->queue_flags); +} + +static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) +{ + queue_lockdep_assert_held(q); + __clear_bit(flag, &q->queue_flags); +} + static inline struct blk_flush_queue *blk_get_flush_queue( struct request_queue *q, struct blk_mq_ctx *ctx) { diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 888c9b25cb8ff..19eaf8d893686 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -712,75 +712,6 @@ void blk_queue_flag_clear(unsigned int flag, struct request_queue *q); bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); bool blk_queue_flag_test_and_clear(unsigned int flag, struct request_queue *q); -/* - * @q->queue_lock is set while a queue is being initialized. Since we know - * that no other threads access the queue object before @q->queue_lock has - * been set, it is safe to manipulate queue flags without holding the - * queue_lock if @q->queue_lock == NULL. See also blk_alloc_queue_node() and - * blk_init_allocated_queue(). - */ -static inline void queue_lockdep_assert_held(struct request_queue *q) -{ - if (q->queue_lock) - lockdep_assert_held(q->queue_lock); -} - -static inline void queue_flag_set_unlocked(unsigned int flag, - struct request_queue *q) -{ - if (test_bit(QUEUE_FLAG_INIT_DONE, &q->queue_flags) && - kref_read(&q->kobj.kref)) - lockdep_assert_held(q->queue_lock); - __set_bit(flag, &q->queue_flags); -} - -static inline void queue_flag_clear_unlocked(unsigned int flag, - struct request_queue *q) -{ - if (test_bit(QUEUE_FLAG_INIT_DONE, &q->queue_flags) && - kref_read(&q->kobj.kref)) - lockdep_assert_held(q->queue_lock); - __clear_bit(flag, &q->queue_flags); -} - -static inline int queue_flag_test_and_clear(unsigned int flag, - struct request_queue *q) -{ - queue_lockdep_assert_held(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) -{ - queue_lockdep_assert_held(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) -{ - queue_lockdep_assert_held(q); - __set_bit(flag, &q->queue_flags); -} - -static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) -{ - queue_lockdep_assert_held(q); - __clear_bit(flag, &q->queue_flags); -} - #define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags) #define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) #define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)