On 4/22/21 1:49 AM, Hannes Reinecke wrote: > So the midlayer can be reduced to handling just the host byte and the > status byte. Whether this is by means of a union or something else > doesn't really matter; this patchset doesn't prevent any of this from > happening. Something that is important to mention is that struct scsi_request is not only used by the SCSI code but also by the IDE code. Changing the 'result' member of struct scsi_request also affects the IDE code. These are the SCSI and block layer calls in the IDE code that I am aware of and that assume that a struct scsi_request immediately follows struct request: * scsi_req_init(). * scsi_cmd_blk_ioctl(). I have not yet tried to evaluate how much work it would take to split the code in block/scsi_ioctl.c such that it supports different layouts for the data that follows struct request for IDE and SCSI. Thanks, Bart.
