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Diffstat (limited to 'kernel/include/scsi/scsi_dh.h')
| -rw-r--r-- | kernel/include/scsi/scsi_dh.h | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/kernel/include/scsi/scsi_dh.h b/kernel/include/scsi/scsi_dh.h new file mode 100644 index 000000000..620c723ee --- /dev/null +++ b/kernel/include/scsi/scsi_dh.h @@ -0,0 +1,93 @@ +/* + * 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 *, activate_complete, void *); +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 *); +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_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; +} +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 |