1 files changed, 59 insertions, 0 deletions

diff --git a/include/scsi/scsi_dh.h b/include/scsi/scsi_dh.h
new file mode 100644
index 000000000000..04d0d8495c83
--- /dev/null
+++ b/include/scsi/scsi_dh.h
@@ -0,0 +1,59 @@
+/*
+ * Header file for SCSI device handler infrastruture.
+ *
+ * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright IBM Corporation, 2007
+ *      Authors:
+ *               Chandra Seetharaman <sekharan@us.ibm.com>
+ *               Mike Anderson <andmike@linux.vnet.ibm.com>
+ */
+
+#include <scsi/scsi_device.h>
+
+enum {
+        SCSI_DH_OK = 0,
+        /*
+         * device errors
+         */
+        SCSI_DH_DEV_FAILED,     /* generic device error */
+        SCSI_DH_DEV_TEMP_BUSY,
+        SCSI_DH_DEVICE_MAX,     /* max device blkerr definition */
+
+        /*
+         * transport errors
+         */
+        SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,
+        SCSI_DH_CONN_FAILURE,
+        SCSI_DH_TRANSPORT_MAX,  /* max transport blkerr definition */
+
+        /*
+         * driver and generic errors
+         */
+        SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */
+        SCSI_DH_INVALID_IO,
+        SCSI_DH_RETRY,          /* retry the req, but not immediately */
+        SCSI_DH_IMM_RETRY,      /* immediately retry the req */
+        SCSI_DH_TIMED_OUT,
+        SCSI_DH_RES_TEMP_UNAVAIL,
+        SCSI_DH_DEV_OFFLINED,
+        SCSI_DH_NOSYS,
+        SCSI_DH_DRIVER_MAX,
+};
+
+extern int scsi_dh_activate(struct request_queue *);
+extern int scsi_dh_handler_exist(const char *);