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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/include/scsi/scsi_dh.h
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/* SPDX-License-Identifier: GPL-2.0-or-later */

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/*

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 * Header file for SCSI device handler infrastructure.

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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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 * 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_NOMEM,

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	SCSI_DH_NOSYS,

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	SCSI_DH_DRIVER_MAX,

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};

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typedef void (*activate_complete)(void *, int);

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struct scsi_device_handler {

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	/* Used by the infrastructure */

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	struct list_head list; /* list of scsi_device_handlers */

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	/* Filled by the hardware handler */

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	struct module *module;

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	const char *name;

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	enum scsi_disposition (*check_sense)(struct scsi_device *,

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					     struct scsi_sense_hdr *);

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	int (*attach)(struct scsi_device *);

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	void (*detach)(struct scsi_device *);

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	int (*activate)(struct scsi_device *, activate_complete, void *);

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	blk_status_t (*prep_fn)(struct scsi_device *, struct request *);

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	int (*set_params)(struct scsi_device *, const char *);

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	void (*rescan)(struct scsi_device *);

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};

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#ifdef CONFIG_SCSI_DH

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

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

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extern const char *scsi_dh_attached_handler_name(struct request_queue *, gfp_t);

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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_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 const char *scsi_dh_attached_handler_name(struct request_queue *q,

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							gfp_t gfp)

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{

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	return NULL;

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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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