On 2020-04-30 06:18, Hannes Reinecke wrote: > From: Hannes Reinecke <hare@xxxxxxxx> > > Quite a lot of drivers are using management commands internally, which > typically use the same hardware tag pool (ie they are being allocated > from the same hardware resources) as the 'normal' I/O commands. > These commands are set aside before allocating the block-mq tag bitmap, > so they'll never show up as busy in the tag map. > The block-layer, OTOH, already has 'reserved_tags' to handle precisely > this situation. > So this patch adds a new field 'nr_reserved_cmds' to the SCSI host > template to instruct the block layer to set aside a tag space for these > management commands by using reserved_tags. Reviewed-by: Bart Van Assche <bvanassche@xxxxxxx>
