fe9233fb69
Do not automatically "select" SCSI_DH for dm-multipath. If SCSI_DH doesn't exist,just do not allow hardware handlers to be used. Handle SCSI_DH being a module also. Make sure it doesn't allow DM_MULTIPATH to be compiled in when SCSI_DH is a module. [jejb: added comment for Kconfig syntax] Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com> Reported-by: Randy Dunlap <randy.dunlap@oracle.com> Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
70 lines
2.0 KiB
C
70 lines
2.0 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_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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