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block: keep q_usage_counter in atomic mode after del_gendisk 

Don't switch back to percpu mode to avoid the double RCU grace period
when tearing down SCSI devices.  After removing the disk only passthrough
commands can be send anyway.

Suggested-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Darrick J. Wong <djwong@kernel.org>
Link: https://lore.kernel.org/r/20210929071241.934472-6-hch@lst.de
Tested-by: Yi Zhang <yi.zhang@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2021-09-29 09:12:41 +02:00 committed by Jens Axboe
parent 8e141f9eb8
commit aec89dc5d4
3 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
block/blk-mq.c
View File

@ -188,9 +188,11 @@ void blk_mq_freeze_queue(struct request_queue *q)
}
EXPORT_SYMBOL_GPL(blk_mq_freeze_queue);
void blk_mq_unfreeze_queue(struct request_queue *q)
void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic)
{
mutex_lock(&q->mq_freeze_lock);
if (force_atomic)
q->q_usage_counter.data->force_atomic = true;
q->mq_freeze_depth--;
WARN_ON_ONCE(q->mq_freeze_depth < 0);
if (!q->mq_freeze_depth) {
@ -199,6 +201,11 @@ void blk_mq_unfreeze_queue(struct request_queue *q)
}
mutex_unlock(&q->mq_freeze_lock);
}
void blk_mq_unfreeze_queue(struct request_queue *q)
{
__blk_mq_unfreeze_queue(q, false);
}
EXPORT_SYMBOL_GPL(blk_mq_unfreeze_queue);
/*

1
block/blk.h
View File

@ -51,6 +51,7 @@ struct blk_flush_queue *blk_alloc_flush_queue(int node, int cmd_size,
void blk_free_flush_queue(struct blk_flush_queue *q);
void blk_freeze_queue(struct request_queue *q);
void __blk_mq_unfreeze_queue(struct request_queue *q, bool force_atomic);
void blk_queue_start_drain(struct request_queue *q);
#define BIO_INLINE_VECS 4

3
block/genhd.c
View File

@ -596,7 +596,8 @@ void del_gendisk(struct gendisk *disk)
/*
* Allow using passthrough request again after the queue is torn down.
*/
blk_mq_unfreeze_queue(q);
blk_queue_flag_clear(QUEUE_FLAG_INIT_DONE, q);
__blk_mq_unfreeze_queue(q, true);
if (!(disk->flags & GENHD_FL_HIDDEN)) {
sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi");