scsi: core: Extend struct scsi_exec_args

Allow SCSI LLDs to specify SCMD_* flags.

Link: https://lore.kernel.org/r/20230210193258.4004923-2-bvanassche@acm.org
Cc: Mike Christie <michael.christie@oracle.com>
Cc: John Garry <john.g.garry@oracle.com>
Reviewed-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: bvanassche

drivers/scsi/scsi_lib.c

@@ -229,6 +229,7 @@ int scsi_execute_cmd(struct scsi_device *sdev, const unsigned char *cmd,
 	scmd->cmd_len = COMMAND_SIZE(cmd[0]);
 	memcpy(scmd->cmnd, cmd, scmd->cmd_len);
 	scmd->allowed = retries;
+	scmd->flags |= args->scmd_flags;
 	req->timeout = timeout;
 	req->rq_flags |= RQF_QUIET;
 

include/scsi/scsi_device.h

@@ -462,6 +462,7 @@ struct scsi_exec_args {
 	unsigned int sense_len;		/* sense buffer len */
 	struct scsi_sense_hdr *sshdr;	/* decoded sense header */
 	blk_mq_req_flags_t req_flags;	/* BLK_MQ_REQ flags */
+	int scmd_flags;			/* SCMD flags */
 	int *resid;			/* residual length */
 };