io context: fix ref counting
Commit d9c7d394 ("block: prevent possible io_context->refcount overflow") mistakenly changed atomic_inc(&ioc->nr_tasks) to atomic_long_inc(&ioc->refcount). Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Acked-by: Nikanth Karthikesan <knikanth@suse.de> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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