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b6ff1b14cd
This patch converts the EMC device handler to use a proper state machine. We now also parse the extended INQUIRY information to determine if long trespass commands are supported. And we're now using the long trespass command correctly. And finally there's now an check at init time to refuse to attach to devices not supporting EMC-specific VPD pages. Signed-off-by: Hannes Reinecke <hare@suse.de> Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/*
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* Header file for SCSI device handler infrastruture.
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*
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* Modified version of patches posted by Mike Christie <michaelc@cs.wisc.edu>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* Copyright IBM Corporation, 2007
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* Authors:
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* Chandra Seetharaman <sekharan@us.ibm.com>
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* Mike Anderson <andmike@linux.vnet.ibm.com>
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*/
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#include <scsi/scsi_device.h>
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enum {
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SCSI_DH_OK = 0,
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/*
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* device errors
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*/
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SCSI_DH_DEV_FAILED, /* generic device error */
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SCSI_DH_DEV_TEMP_BUSY,
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SCSI_DH_DEV_UNSUPP, /* device handler not supported */
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SCSI_DH_DEVICE_MAX, /* max device blkerr definition */
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/*
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* transport errors
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*/
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SCSI_DH_NOTCONN = SCSI_DH_DEVICE_MAX + 1,
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SCSI_DH_CONN_FAILURE,
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SCSI_DH_TRANSPORT_MAX, /* max transport blkerr definition */
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/*
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* driver and generic errors
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*/
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SCSI_DH_IO = SCSI_DH_TRANSPORT_MAX + 1, /* generic error */
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SCSI_DH_INVALID_IO,
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SCSI_DH_RETRY, /* retry the req, but not immediately */
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SCSI_DH_IMM_RETRY, /* immediately retry the req */
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SCSI_DH_TIMED_OUT,
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SCSI_DH_RES_TEMP_UNAVAIL,
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SCSI_DH_DEV_OFFLINED,
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SCSI_DH_NOSYS,
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SCSI_DH_DRIVER_MAX,
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};
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#if defined(CONFIG_SCSI_DH) || defined(CONFIG_SCSI_DH_MODULE)
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extern int scsi_dh_activate(struct request_queue *);
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extern int scsi_dh_handler_exist(const char *);
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#else
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static inline int scsi_dh_activate(struct request_queue *req)
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{
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return 0;
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}
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static inline int scsi_dh_handler_exist(const char *name)
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{
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return 0;
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}
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#endif
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