scsi_dh.h

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/*
 * Header file for SCSI device handler infrastruture.
 *
 * Modified version of patches posted by Mike Christie <[email protected]>
 *
 * 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 <[email protected]>
 *               Mike Anderson <[email protected]>
 */

#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_DEV_UNSUPP, /* device handler not supported */
    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,
};
#if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE)
extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);
extern int scsi_dh_handler_exist(const char *);
extern int scsi_dh_attach(struct request_queue *, const char *);
extern void scsi_dh_detach(struct request_queue *);
extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);
extern int scsi_dh_set_params(struct request_queue *, const char *);
#else
static inline int scsi_dh_activate(struct request_queue *req,
                    activate_complete fn, void *data)
{
    fn(data, 0);
    return 0;
}
static inline int scsi_dh_handler_exist(const char *name)
{
    return 0;
}
static inline int scsi_dh_attach(struct request_queue *req, const char *name)
{
    return SCSI_DH_NOSYS;
}
static inline void scsi_dh_detach(struct request_queue *q)
{
    return;
}
static inline const char *scsi_dh_attached_handler_name(struct request_queue *q,
                            gfp_t gfp)
{
    return NULL;
}
static inline int scsi_dh_set_params(struct request_queue *req, const char *params)
{
    return -SCSI_DH_NOSYS;
}
#endif