Add helper functions to retrieve SCSI commands from the reserved
tag pool.
Signed-off-by: Hannes Reinecke <h...@suse.com>
---
include/scsi/scsi_tcq.h | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
index 6053d46e794e..227f3bd4e974 100644
--- a/include/scsi/scsi_tcq.h
+++ b/include/scsi/scsi_tcq.h
@@ -39,5 +39,27 @@ static inline struct scsi_cmnd *scsi_host_find_tag(struct
Scsi_Host *shost,
return blk_mq_rq_to_pdu(req);
}
+static inline struct scsi_cmnd *scsi_get_reserved_cmd(struct scsi_device *sdev)
+{
+ struct request *rq;
+ struct scsi_cmnd *scmd;
+
+ rq = blk_mq_alloc_request(sdev->request_queue,
+ REQ_OP_SCSI_OUT | REQ_NOWAIT,
+ BLK_MQ_REQ_RESERVED);
+ if (IS_ERR(rq))
+ return NULL;
+ scmd = blk_mq_rq_to_pdu(rq);
+ scmd->request = rq;
+ return scmd;
+}
+
+static inline void scsi_put_reserved_cmd(struct scsi_cmnd *scmd)
+{
+ struct request *rq = blk_mq_rq_from_pdu(scmd);
+
+ blk_mq_free_request(rq);
+}
+
#endif /* CONFIG_BLOCK */
#endif /* _SCSI_SCSI_TCQ_H */
--
2.16.4
