| /* |
| * 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_NOSYS, |
| SCSI_DH_DRIVER_MAX, |
| }; |
| #if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE) |
| extern int scsi_dh_activate(struct request_queue *); |
| 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 *); |
| #else |
| static inline int scsi_dh_activate(struct request_queue *req) |
| { |
| 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; |
| } |
| #endif |