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authorDavid C Somayajulu <david.somayajulu@qlogic.com>2006-10-04 08:27:25 +0200
committerJens Axboe <axboe@nelson.home.kernel.dk>2006-10-04 19:32:09 +0200
commitf583f4924d669d36de677e0cc2422ee95203d444 (patch)
tree08efeac804151bbaef8cf0ca7effaa4e30e037f9 /include/scsi/scsi_tcq.h
parent4a61f17378c2cdd9bd8f34ef8bd7422861d0c1f1 (diff)
[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>
Diffstat (limited to 'include/scsi/scsi_tcq.h')
-rw-r--r--include/scsi/scsi_tcq.h20
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 */