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block: Introduce blk_exit_queue()

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This patch does not change any functionality.

Signed-off-by: Bart Van Assche <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Ming Lei <[email protected]>
Cc: Omar Sandoval <[email protected]>
Cc: Alexandru Moise <[email protected]>
Cc: Joseph Qi <[email protected]>
Cc: <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Bart Van Assche authored and Jens Axboe committed 2018-08-09 09:12:59 -06:00
1 parent 6bad9b210a
commit 4cf6324b17
2 files changed
+31 -24
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block/blk-core.c
+30 -24
View File
@@ -715,6 +715,35 @@ void blk_set_queue_dying(struct request_queue *q)
}
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
* @q: request queue to shutdown
@@ -784,30 +813,7 @@ void blk_cleanup_queue(struct request_queue *q)
*/
WARN_ON_ONCE(q->kobj.state_in_sysfs);
/*
* 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_exit_queue(q);
if (q->mq_ops)
blk_mq_free_queue(q);
block/blk.h
+1
View File
@@ -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,
gfp_t gfp_mask);
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,
struct bio *bio);
void blk_queue_bypass_start(struct request_queue *q);