On Thu, Sep 23, 2021 at 09:34:03AM +0800, Ming Lei wrote: > > + set_bit(GD_DEAD, &disk->state); > > set_capacity(disk, 0); > > > > + /* > > + * Prevent new I/O from crossing bio_queue_enter(). > > + */ > > + blk_queue_start_drain(q); > > + blk_mq_freeze_queue_wait(q); > > + > > + rq_qos_exit(q); > > + blk_sync_queue(q); > > + blk_flush_integrity(); > > + /* > > + * Allow using passthrough request again after the queue is torn down. > > + */ > > + blk_mq_unfreeze_queue(q); > > After blk_mq_unfreeze_queue() returns, blk_try_enter_queue() will return > true, so new FS I/O from opened bdev still won't be blocked, right? It won't be blocked by blk_mq_unfreeze_queue, but because the capacity is set to 0 it still won't make it to the driver.
