Re: [PATCH] block: set rq->cmd_flags with bio->opf instead of data->cmd_flags when bio is not Null

From: Christoph Hellwig
Date: Mon Jan 28 2019 - 09:07:27 EST

> > for rq->cmd_flags. It will cause dix=0 in function
> > sd_setup_read_write_cmnd() when enabled DIX, which will cause IO
> > exception when enabled DIX.
> >
> > For some IOs such as internal IO from SCSI layer, the parameter bio of
> > function blk_mq_get_request() is Null, so need to check bio to
> > decise rq->cmd_flags.

We have data->cmd_flags to deal with the NULL bio case.
blk_mq_make_request initializes data->cmd_flags from bio->bi_opf
just before calling blk_mq_get_request, so I'm really missing what you
are trying to fix here.