On Wed, Apr 20, 2022 at 10:31:10PM +0800, Ming Lei wrote: > So far bio is marked as REQ_POLLED if RWF_HIPRI/IOCB_HIPRI is passed > from userspace sync io interface, then block layer tries to poll until > the bio is completed. But the current implementation calls > blk_io_schedule() if bio_poll() returns 0, and this way causes io hang or > timeout easily. Wait a second. The task's current state is TASK_RUNNING when bio_poll() returns zero, so calling blk_io_schedule() isn't supposed to hang.
