On 2021-01-13 5:45 p.m., Douglas Gilbert wrote:
The support is added via the new SGV4_FLAG_HIPRI command flag which causes REQ_HIPRI to be set on the request. Before waiting on an inflight request, it is checked to see if it has SGV4_FLAG_HIPRI, and if so blk_poll() is called instead of the wait. In situations where only the file descriptor is known (e.g. sg_poll() and ioctl(SG_GET_NUM_WAITING)) all inflight requests associated with the file descriptor that have SGV4_FLAG_HIPRI set, have sg_poll()
s/have sg_poll/have blk_poll/
called on them. Note that the implementation of blk_poll() calls mq_poll() in the LLD associated with the request. Then for any request found to be ready, blk_poll() invokes the scsi_done() callback. So this means if blk_poll() returns 1 then sg_rq_end_io() has already been called for the polled request.
<snip>
