[PATCH] helper function for retrieving scsi_cmd given host based block layer tag

This was necessitated by the need for a function to get back
to a scsi_cmnd, when an hba the posts its (corresponding) completion
interrupt with a block layer tag as its reference.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: David Somayajulu <david.somayajulu@qlogic.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/scsi/scsi_tcq.h b/include/scsi/scsi_tcq.h
index c247a28259bc..cf4c219c0b5c 100644
--- a/include/scsi/scsi_tcq.h
+++ b/include/scsi/scsi_tcq.h
@@ -144,5 +144,25 @@ static inline int scsi_init_shared_tag_map(struct Scsi_Host *shost, int depth)
         return shost->bqt ? 0 : -ENOMEM;
 }
 
+/**
+ * scsi_host_find_tag - find the tagged command by host
+ * @shost:      pointer to scsi_host
+ * @tag:        tag of the scsi_cmnd
+ *
+ * Notes:
+ *      Only works with tags allocated by the generic blk layer.
+ **/
+static inline struct scsi_cmnd *scsi_host_find_tag(struct Scsi_Host *shost,
+                                                int tag)
+{
+        struct request *req;
+
+        if (tag != SCSI_NO_TAG) {
+                req = blk_map_queue_find_tag(shost->bqt, tag);
+                return req ? (struct scsi_cmnd *)req->special : NULL;
+        }
+        return NULL;
+}
+
 #endif /* CONFIG_BLOCK */
 #endif /* _SCSI_SCSI_TCQ_H */