Commit 4cf6324b authored by Bart Van Assche's avatar Bart Van Assche Committed by Jens Axboe

block: Introduce blk_exit_queue()

This patch does not change any functionality.
Signed-off-by: default avatarBart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Ming Lei <ming.lei@redhat.com>
Cc: Omar Sandoval <osandov@fb.com>
Cc: Alexandru Moise <00moses.alexander00@gmail.com>
Cc: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 6bad9b21
...@@ -715,6 +715,35 @@ void blk_set_queue_dying(struct request_queue *q) ...@@ -715,6 +715,35 @@ void blk_set_queue_dying(struct request_queue *q)
} }
EXPORT_SYMBOL_GPL(blk_set_queue_dying); EXPORT_SYMBOL_GPL(blk_set_queue_dying);
/* Unconfigure the I/O scheduler and dissociate from the cgroup controller. */
void blk_exit_queue(struct request_queue *q)
{
/*
* Since the I/O scheduler exit code may access cgroup information,
* perform I/O scheduler exit before disassociating from the block
* cgroup controller.
*/
if (q->elevator) {
ioc_clear_queue(q);
elevator_exit(q, q->elevator);
q->elevator = NULL;
}
/*
* Remove all references to @q from the block cgroup controller before
* restoring @q->queue_lock to avoid that restoring this pointer causes
* e.g. blkcg_print_blkgs() to crash.
*/
blkcg_exit_queue(q);
/*
* Since the cgroup code may dereference the @q->backing_dev_info
* pointer, only decrease its reference count after having removed the
* association with the block cgroup controller.
*/
bdi_put(q->backing_dev_info);
}
/** /**
* blk_cleanup_queue - shutdown a request queue * blk_cleanup_queue - shutdown a request queue
* @q: request queue to shutdown * @q: request queue to shutdown
...@@ -784,30 +813,7 @@ void blk_cleanup_queue(struct request_queue *q) ...@@ -784,30 +813,7 @@ void blk_cleanup_queue(struct request_queue *q)
*/ */
WARN_ON_ONCE(q->kobj.state_in_sysfs); WARN_ON_ONCE(q->kobj.state_in_sysfs);
/* blk_exit_queue(q);
* Since the I/O scheduler exit code may access cgroup information,
* perform I/O scheduler exit before disassociating from the block
* cgroup controller.
*/
if (q->elevator) {
ioc_clear_queue(q);
elevator_exit(q, q->elevator);
q->elevator = NULL;
}
/*
* Remove all references to @q from the block cgroup controller before
* restoring @q->queue_lock to avoid that restoring this pointer causes
* e.g. blkcg_print_blkgs() to crash.
*/
blkcg_exit_queue(q);
/*
* Since the cgroup code may dereference the @q->backing_dev_info
* pointer, only decrease its reference count after having removed the
* association with the block cgroup controller.
*/
bdi_put(q->backing_dev_info);
if (q->mq_ops) if (q->mq_ops)
blk_mq_free_queue(q); blk_mq_free_queue(q);
......
...@@ -130,6 +130,7 @@ void blk_free_flush_queue(struct blk_flush_queue *q); ...@@ -130,6 +130,7 @@ void blk_free_flush_queue(struct blk_flush_queue *q);
int blk_init_rl(struct request_list *rl, struct request_queue *q, int blk_init_rl(struct request_list *rl, struct request_queue *q,
gfp_t gfp_mask); gfp_t gfp_mask);
void blk_exit_rl(struct request_queue *q, struct request_list *rl); void blk_exit_rl(struct request_queue *q, struct request_list *rl);
void blk_exit_queue(struct request_queue *q);
void blk_rq_bio_prep(struct request_queue *q, struct request *rq, void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
struct bio *bio); struct bio *bio);
void blk_queue_bypass_start(struct request_queue *q); void blk_queue_bypass_start(struct request_queue *q);
......
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