| /* |
| * Header file for SCSI device handler infrastruture. |
| * |
| * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu> |
| * |
| * 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 <sekharan@us.ibm.com> |
| * Mike Anderson <andmike@linux.vnet.ibm.com> |
| */ |
| |
| #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_NOMEM, |
| SCSI_DH_NOSYS, |
| SCSI_DH_DRIVER_MAX, |
| }; |
| |
| typedef void (*activate_complete)(void *, int); |
| struct scsi_device_handler { |
| /* Used by the infrastructure */ |
| struct list_head list; /* list of scsi_device_handlers */ |
| |
| /* Filled by the hardware handler */ |
| struct module *module; |
| const char *name; |
| int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *); |
| int (*attach)(struct scsi_device *); |
| void (*detach)(struct scsi_device *); |
| int (*activate)(struct scsi_device *, activate_complete, void *); |
| int (*prep_fn)(struct scsi_device *, struct request *); |
| int (*set_params)(struct scsi_device *, const char *); |
| void (*rescan)(struct scsi_device *); |
| }; |
| |
| #ifdef CONFIG_SCSI_DH |
| extern int scsi_dh_activate(struct request_queue *, activate_complete, void *); |
| extern int scsi_dh_attach(struct request_queue *, const char *); |
| 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_attach(struct request_queue *req, const char *name) |
| { |
| return SCSI_DH_NOSYS; |
| } |
| 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 |