1/* 2 * Header file for SCSI device handler infrastruture. 3 * 4 * Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, but 12 * WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, write to the Free Software Foundation, Inc., 18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 19 * 20 * Copyright IBM Corporation, 2007 21 * Authors: 22 * Chandra Seetharaman <sekharan@us.ibm.com> 23 * Mike Anderson <andmike@linux.vnet.ibm.com> 24 */ 25 26#include <scsi/scsi_device.h> 27 28enum { 29 SCSI_DH_OK = 0, 30 /* 31 * device errors 32 */ 33 SCSI_DH_DEV_FAILED, /* generic device error */ 34 SCSI_DH_DEV_TEMP_BUSY, 35 SCSI_DH_DEV_UNSUPP, /* device handler not supported */ 36 SCSI_DH_DEVICE_MAX, /* max device blkerr definition */ 37 38 /* 39 * transport errors 40 */ 41 SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1, 42 SCSI_DH_CONN_FAILURE, 43 SCSI_DH_TRANSPORT_MAX, /* max transport blkerr definition */ 44 45 /* 46 * driver and generic errors 47 */ 48 SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */ 49 SCSI_DH_INVALID_IO, 50 SCSI_DH_RETRY, /* retry the req, but not immediately */ 51 SCSI_DH_IMM_RETRY, /* immediately retry the req */ 52 SCSI_DH_TIMED_OUT, 53 SCSI_DH_RES_TEMP_UNAVAIL, 54 SCSI_DH_DEV_OFFLINED, 55 SCSI_DH_NOSYS, 56 SCSI_DH_DRIVER_MAX, 57}; 58#if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE) 59extern int scsi_dh_activate(struct request_queue *, activate_complete, void *); 60extern int scsi_dh_handler_exist(const char *); 61extern int scsi_dh_attach(struct request_queue *, const char *); 62extern void scsi_dh_detach(struct request_queue *); 63extern int scsi_dh_set_params(struct request_queue *, const char *); 64#else 65static inline int scsi_dh_activate(struct request_queue *req, 66 activate_complete fn, void *data) 67{ 68 fn(data, 0); 69 return 0; 70} 71static inline int scsi_dh_handler_exist(const char *name) 72{ 73 return 0; 74} 75static inline int scsi_dh_attach(struct request_queue *req, const char *name) 76{ 77 return SCSI_DH_NOSYS; 78} 79static inline void scsi_dh_detach(struct request_queue *q) 80{ 81 return; 82} 83static inline int scsi_dh_set_params(struct request_queue *req, const char *params) 84{ 85 return -SCSI_DH_NOSYS; 86} 87#endif 88