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 28 enum { 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_DEVICE_MAX, /* max device blkerr definition */ 36 37 /* 38 * transport errors 39 */ 40 SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1, 41 SCSI_DH_CONN_FAILURE, 42 SCSI_DH_TRANSPORT_MAX, /* max transport blkerr definition */ 43 44 /* 45 * driver and generic errors 46 */ 47 SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */ 48 SCSI_DH_INVALID_IO, 49 SCSI_DH_RETRY, /* retry the req, but not immediately */ 50 SCSI_DH_IMM_RETRY, /* immediately retry the req */ 51 SCSI_DH_TIMED_OUT, 52 SCSI_DH_RES_TEMP_UNAVAIL, 53 SCSI_DH_DEV_OFFLINED, 54 SCSI_DH_NOSYS, 55 SCSI_DH_DRIVER_MAX, 56 }; 57 #if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE) 58 extern int scsi_dh_activate(struct request_queue *); 59 extern int scsi_dh_handler_exist(const char *); 60 #else 61 static inline int scsi_dh_activate(struct request_queue *req) 62 { 63 return 0; 64 } 65 static inline int scsi_dh_handler_exist(const char *name) 66 { 67 return 0; 68 } 69 #endif 70