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scsi: add scsi_setup_cmnd helper 

Factor out command setup code that will be shared with the blk-mq code path.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Webb Scales <webbnh@hp.com>
hifive-unleashed-5.1
Christoph Hellwig 2014-07-08 13:16:17 +02:00
parent 4f1e576575
commit 6af7a4ffa2
1 changed files with 22 additions and 18 deletions
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40
drivers/scsi/scsi_lib.c
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@ -1092,6 +1092,27 @@ static int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
return scsi_cmd_to_driver(cmd)->init_command(cmd);
}
static int scsi_setup_cmnd(struct scsi_device *sdev, struct request *req)
{
struct scsi_cmnd *cmd = req->special;
if (!blk_rq_bytes(req))
cmd->sc_data_direction = DMA_NONE;
else if (rq_data_dir(req) == WRITE)
cmd->sc_data_direction = DMA_TO_DEVICE;
else
cmd->sc_data_direction = DMA_FROM_DEVICE;
switch (req->cmd_type) {
case REQ_TYPE_FS:
return scsi_setup_fs_cmnd(sdev, req);
case REQ_TYPE_BLOCK_PC:
return scsi_setup_blk_pc_cmnd(sdev, req);
default:
return BLKPREP_KILL;
}
}
static int
scsi_prep_state_check(struct scsi_device *sdev, struct request *req)
{
@ -1195,24 +1216,7 @@ static int scsi_prep_fn(struct request_queue *q, struct request *req)
goto out;
}
if (!blk_rq_bytes(req))
cmd->sc_data_direction = DMA_NONE;
else if (rq_data_dir(req) == WRITE)
cmd->sc_data_direction = DMA_TO_DEVICE;
else
cmd->sc_data_direction = DMA_FROM_DEVICE;
switch (req->cmd_type) {
case REQ_TYPE_FS:
ret = scsi_setup_fs_cmnd(sdev, req);
break;
case REQ_TYPE_BLOCK_PC:
ret = scsi_setup_blk_pc_cmnd(sdev, req);
break;
default:
ret = BLKPREP_KILL;
}
ret = scsi_setup_cmnd(sdev, req);
out:
return scsi_prep_return(q, req, ret);
}