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b8e162f9e7
Improve readability of the code in the SCSI core by introducing an enumeration type for the values used internally that decide how to continue processing a SCSI command. The eh_*_handler return values have not been changed because that would involve modifying all SCSI drivers. The output of the following command has been inspected to verify that no out-of-range values are assigned to a variable of type enum scsi_disposition: KCFLAGS=-Wassign-enum make CC=clang W=1 drivers/scsi/ Link: https://lore.kernel.org/r/20210415220826.29438-6-bvanassche@acm.org Cc: Christoph Hellwig <hch@lst.de> Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Daniel Wagner <dwagner@suse.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/* 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 <michaelc@cs.wisc.edu>
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*
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* Copyright IBM Corporation, 2007
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* Authors:
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* Chandra Seetharaman <sekharan@us.ibm.com>
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* Mike Anderson <andmike@linux.vnet.ibm.com>
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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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