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authorJames Bottomley <James.Bottomley@steeleye.com>2006-08-30 09:45:51 -0400
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-08-31 11:18:03 -0400
commit86e33a296c2c9ed6eece0bfff4ac776f42040504 (patch)
tree7c4a11084b233e1899aec6c247435f3478bbd3b5 /include/scsi/scsi_host.h
parent492dfb489658dfe4a755fa29dd0e34e9c8bd8fb8 (diff)
[SCSI] add shared tag map helpers
This patch adds support for sharing tag maps at the host level (i.e. either every queue [LUN] has its own tag map or there's a single one for the entire host). This formulation is primarily intended to help single issue queue hardware, like the aic7xxx Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'include/scsi/scsi_host.h')
-rw-r--r--include/scsi/scsi_host.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index b3dd90f3e85..39c6f8cc20c 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -16,6 +16,7 @@ struct scsi_target;
struct Scsi_Host;
struct scsi_host_cmd_pool;
struct scsi_transport_template;
+struct blk_queue_tags;
/*
@@ -466,6 +467,12 @@ struct Scsi_Host {
struct scsi_transport_template *transportt;
/*
+ * area to keep a shared tag map (if needed, will be
+ * NULL if not)
+ */
+ struct blk_queue_tag *bqt;
+
+ /*
* The following two fields are protected with host_lock;
* however, eh routines can safely access during eh processing
* without acquiring the lock.