[SCSI] aacraid: add vpd to inquiry

Report VPD inquiry page 0x80 with an unique array creation serial
number (CUID). When an array is created, the metadata stored on the
physical drives gets an unique serial number. This serial number
remains constant through array morphing or migration to other
controllers.  This patch is a forward port and modification to survive
morphing and migration operations, of a similar piece of
(un-attributed author) code added to the SLES10 SP1 aacraid driver.

To test the results of the patch, observe that /dev/disk/by-id/
entries will show up for the arrays resulting from the udev rules.
Also, as per the udev rules, 'scsi_id -g -x -a -s /block/sd? -d
/dev/sd?'  will report the ID_SERIAL as constructed from the inquiry
data.

It was reported to me that the 'ADPT' leading the serial number was bad
form, that the inquiry vendor field was enough to differentiate the
storage uniquely. Subsequent search found that another Adaptec AAC based
driver reported the 8 hex serial number only without such adornments, so
dropped ADPT to match. Resubmitting the patch with this alteration.

Signed-off-by: Mark Salyzyn <aacraid@adaptec.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/scsi/aacraid/aacraid.h b/drivers/scsi/aacraid/aacraid.h
index f1d3b66af879..400d03403cd5 100644
--- a/drivers/scsi/aacraid/aacraid.h
+++ b/drivers/scsi/aacraid/aacraid.h
@@ -1567,6 +1567,20 @@ struct aac_get_name_resp {
         u8              data[16];
 };
 
+#define CT_CID_TO_32BITS_UID 165
+struct aac_get_serial {
+        __le32          command;        /* VM_ContainerConfig */
+        __le32          type;           /* CT_CID_TO_32BITS_UID */
+        __le32          cid;
+};
+
+struct aac_get_serial_resp {
+        __le32          dummy0;
+        __le32          dummy1;
+        __le32          status; /* CT_OK */
+        __le32          uid;
+};
+
 /*
  * The following command is sent to shut down each container.
  */