ae11b1b36d
multipath keeps a separate device table which may be more current than the built-in one. So we should make sure to always call ->attach whenever a multipath map with hardware handler is instantiated. And we should call ->detach on removal, too. [sekharan: update as per comments from agk] 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>
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
|
|
* 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 *);
|
|
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 *);
|
|
#else
|
|
static inline int scsi_dh_activate(struct request_queue *req)
|
|
{
|
|
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;
|
|
}
|
|
#endif
|