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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/include/scsi/scsi_dh.h
10820 views
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/*

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 * Header file for SCSI device handler infrastruture.

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 *

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 * Modified version of patches posted by Mike Christie <[email protected]>

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 *

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 * This program is free software; you can redistribute it and/or modify it

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 * under the terms of the GNU General Public License as published by the

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 * Free Software Foundation; either version 2 of the License, or (at your

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 * option) any later version.

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 *

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 * This program is distributed in the hope that it will be useful, but

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 * WITHOUT ANY WARRANTY; without even the implied warranty of

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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

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 * General Public License for more details.

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 *

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 * You should have received a copy of the GNU General Public License along

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 * with this program; if not, write to the Free Software Foundation, Inc.,

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 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

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 *

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 * Copyright IBM Corporation, 2007

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 *      Authors:

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 *               Chandra Seetharaman <[email protected]>

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 *               Mike Anderson <[email protected]>

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 */

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#include <scsi/scsi_device.h>

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enum {

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	SCSI_DH_OK = 0,

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	/*

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	 * device errors

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	 */

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	SCSI_DH_DEV_FAILED,	/* generic device error */

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	SCSI_DH_DEV_TEMP_BUSY,

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	SCSI_DH_DEV_UNSUPP,	/* device handler not supported */

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	SCSI_DH_DEVICE_MAX,	/* max device blkerr definition */

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	/*

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	 * transport errors

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	 */

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	SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,

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	SCSI_DH_CONN_FAILURE,

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	SCSI_DH_TRANSPORT_MAX,	/* max transport blkerr definition */

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	/*

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	 * driver and generic errors

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	 */

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	SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1,	/* generic error */

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	SCSI_DH_INVALID_IO,

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	SCSI_DH_RETRY,		/* retry the req, but not immediately */

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	SCSI_DH_IMM_RETRY,	/* immediately retry the req */

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	SCSI_DH_TIMED_OUT,

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	SCSI_DH_RES_TEMP_UNAVAIL,

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	SCSI_DH_DEV_OFFLINED,

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	SCSI_DH_NOSYS,

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	SCSI_DH_DRIVER_MAX,

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};

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#if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE)

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extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);

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extern int scsi_dh_handler_exist(const char *);

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extern int scsi_dh_attach(struct request_queue *, const char *);

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extern void scsi_dh_detach(struct request_queue *);

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extern int scsi_dh_set_params(struct request_queue *, const char *);

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#else

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static inline int scsi_dh_activate(struct request_queue *req,

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					activate_complete fn, void *data)

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{

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	fn(data, 0);

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	return 0;

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}

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static inline int scsi_dh_handler_exist(const char *name)

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{

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	return 0;

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}

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static inline int scsi_dh_attach(struct request_queue *req, const char *name)

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{

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	return SCSI_DH_NOSYS;

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}

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static inline void scsi_dh_detach(struct request_queue *q)

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{

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	return;

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}

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static inline int scsi_dh_set_params(struct request_queue *req, const char *params)

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{

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	return -SCSI_DH_NOSYS;

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}

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#endif

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