[SCSI] scsi_dh: add infrastructure for SCSI Device Handlers

[linux-2.6-omap-h63xx.git] / include / scsi / scsi_device.h

diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index f6a9fe0ef09c62cf38b28f6cdd9bfd9bad06121a..06b979f105b790e7988ed99b54583ef575db32ed 100644 (file)
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -161,9 +161,29 @@ 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)        \
@@ -230,7 +250,9 @@ 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 *);