[SCSI] scsi_dh: Update EMC handler

This patch converts the EMC device handler to use a proper
state machine. We now also parse the extended INQUIRY
information to determine if long trespass commands are
supported. And we're now using the long trespass command
correctly. And finally there's now an check at init time
to refuse to attach to devices not supporting EMC-specific
VPD pages.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/scsi/scsi_dh.h b/include/scsi/scsi_dh.h
index 3ad2303d1a16..e15e2aade69c 100644
--- a/include/scsi/scsi_dh.h
+++ b/include/scsi/scsi_dh.h
@@ -32,6 +32,7 @@ enum {
          */
         SCSI_DH_DEV_FAILED,     /* generic device error */
         SCSI_DH_DEV_TEMP_BUSY,
+        SCSI_DH_DEV_UNSUPP,     /* device handler not supported */
         SCSI_DH_DEVICE_MAX,     /* max device blkerr definition */
 
         /*