[RFC PATCH 04/14] SCSI: pass 'scsi_device' instance from 'scsi_request'

Ming Lei
2018-08-07T17:44:23Z

This patch prepares for introducing SCSI per-host admin queue, which
is only used for queuing admin requests, which are now submitted via
__scsi_execute().

Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Jianchao Wang <jianchao.w.wang@oracle.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: "James E.J. Bottomley" <jejb@linux.vnet.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
drivers/scsi/scsi_lib.c | 2 ++
include/scsi/scsi_request.h | 5 ++++-
2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 4341cf8a7322..62699adaef61 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -279,6 +279,8 @@ int __scsi_execute(struct scsi_device *sdev, const unsigned char *cmd,
rq->cmd_len = COMMAND_SIZE(cmd[0]);
memcpy(rq->cmd, cmd, rq->cmd_len);
rq->retries = retries;
+ rq->sdev = sdev; /* only valid in submit path */
+
req->timeout = timeout;
req->cmd_flags |= flags;
req->rq_flags |= rq_flags | RQF_QUIET;
diff --git a/include/scsi/scsi_request.h b/include/scsi/scsi_request.h
index b06f28c74908..0de6901b48ab 100644
--- a/include/scsi/scsi_request.h
+++ b/include/scsi/scsi_request.h
@@ -14,7 +14,10 @@ struct scsi_request {
unsigned int sense_len;
unsigned int resid_len; /* residual count */
int retries;
- void *sense;
+ union {
+ void *sense;
+ struct scsi_device *sdev;
+ };
};

static inline struct scsi_request *scsi_req(struct request *rq)
--
2.9.5