1 files changed, 22 insertions, 0 deletions

diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index 00b78763a1bf..6467f78b191f 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -162,9 +162,29 @@ struct scsi_device {
 
         struct execute_work     ew; /* used to get process context on put */
 
+        struct scsi_dh_data     *scsi_dh_data;
         enum scsi_device_state sdev_state;
         unsigned long           sdev_data[0];
 } __attribute__((aligned(sizeof(unsigned long))));
+
+struct scsi_device_handler {
+        /* Used by the infrastructure */
+        struct list_head list; /* list of scsi_device_handlers */
+        struct notifier_block nb;
+
+        /* Filled by the hardware handler */
+        struct module *module;
+        const char *name;
+        int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
+        int (*activate)(struct scsi_device *);
+        int (*prep_fn)(struct scsi_device *, struct request *);
+};
+
+struct scsi_dh_data {
+        struct scsi_device_handler *scsi_dh;
+        char buf[0];
+};
+
 #define to_scsi_device(d)       \
         container_of(d, struct scsi_device, sdev_gendev)
 #define class_to_sdev(d)        \
@@ -231,7 +251,9 @@ extern struct scsi_device *__scsi_add_device(struct Scsi_Host *,
                 uint, uint, uint, void *hostdata);
 extern int scsi_add_device(struct Scsi_Host *host, uint channel,
                            uint target, uint lun);
+extern int scsi_register_device_handler(struct scsi_device_handler *scsi_dh);
 extern void scsi_remove_device(struct scsi_device *);
+extern int scsi_unregister_device_handler(struct scsi_device_handler *scsi_dh);
 
 extern int scsi_device_get(struct scsi_device *);
 extern void scsi_device_put(struct scsi_device *);