mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 16:24:13 +08:00
7e8a74b177
Introduce scsi_dh_attached_handler_name() to retrieve the name of the
scsi_dh that is attached to the scsi_device associated with the provided
request queue. Returns NULL if a scsi_dh is not attached.
Also, fix scsi_dh_{attach,detach} function header comments to document
@q rather than @sdev.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Tested-by: Babu Moger <babu.moger@netapp.com>
Reviewed-by: Chandra Seetharaman <sekharan@us.ibm.com>
Acked-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
94 lines
2.8 KiB
C
94 lines
2.8 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 *, 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
|