[SCSI] allow the HBA to reserve target and device private areas

This patch basically allows any HBA attached to the SPI transport class
to declare an extra area which the mid-layer will allocate as part of
its device and target allocations.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h
index 2dcee7a84752..a4f1837a33b1 100644
--- a/include/scsi/scsi_transport.h
+++ b/include/scsi/scsi_transport.h
@@ -21,6 +21,7 @@
 #define SCSI_TRANSPORT_H
 
 #include <linux/transport_class.h>
+#include <scsi/scsi_host.h>
 
 struct scsi_transport_template {
         /* the attribute containers */
@@ -32,8 +33,11 @@ struct scsi_transport_template {
          * space of this size will be left at the end of the
          * scsi_* structure */
         int     device_size;
+        int     device_private_offset;
         int     target_size;
+        int     target_private_offset;
         int     host_size;
+        /* no private offset for the host; there's an alternative mechanism */
 
         /*
          * True if the transport wants to use a host-based work-queue
@@ -45,4 +49,38 @@ struct scsi_transport_template {
         dev_to_shost((tc)->dev)
 
 
+/* Private area maintenance. The driver requested allocations come
+ * directly after the transport class allocations (if any).  The idea
+ * is that you *must* call these only once.  The code assumes that the
+ * initial values are the ones the transport specific code requires */
+static inline void
+scsi_transport_reserve_target(struct scsi_transport_template * t, int space)
+{
+        BUG_ON(t->target_private_offset != 0);
+        t->target_private_offset = ALIGN(t->target_size, sizeof(void *));
+        t->target_size = t->target_private_offset + space;
+}
+static inline void
+scsi_transport_reserve_device(struct scsi_transport_template * t, int space)
+{
+        BUG_ON(t->device_private_offset != 0);
+        t->device_private_offset = ALIGN(t->device_size, sizeof(void *));
+        t->device_size = t->device_private_offset + space;
+}
+static inline void *
+scsi_transport_target_data(struct scsi_target *starget)
+{
+        struct Scsi_Host *shost = dev_to_shost(&starget->dev);
+        return (u8 *)starget->starget_data
+                + shost->transportt->target_private_offset;
+
+}
+static inline void *
+scsi_transport_device_data(struct scsi_device *sdev)
+{
+        struct Scsi_Host *shost = sdev->host;
+        return (u8 *)sdev->sdev_data
+                + shost->transportt->device_private_offset;
+}
+
 #endif /* SCSI_TRANSPORT_H */