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/* $OpenBSD: mpathvar.h,v 1.9 2013/08/27 00:53:10 dlg Exp $ */
/*
* Copyright (c) 2010 David Gwynne <dlg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef _SYS_SCSI_MPATH_H_
#define _SYS_SCSI_MPATH_H_
struct mpath_group;
struct mpath_ops {
char op_name[16];
int (*op_checksense)(struct scsi_xfer *);
void (*op_status)(struct scsi_link *);
};
#define MPATH_SENSE_DECLINED 0 /* path driver declined to interpret sense */
#define MPATH_SENSE_FAILOVER 1 /* sense says controllers have failed over */
#define MPATH_S_UNKNOWN -1
#define MPATH_S_ACTIVE 0
#define MPATH_S_PASSIVE 1
struct mpath_path {
/* the path driver must set these */
struct scsi_xshandler p_xsh;
struct scsi_link *p_link;
int p_gid;
/* the following are private to mpath.c */
TAILQ_ENTRY(mpath_path) p_entry;
struct mpath_group *p_group;
int p_state;
};
int mpath_path_probe(struct scsi_link *);
int mpath_path_attach(struct mpath_path *, u_int,
const struct mpath_ops *);
void mpath_path_status(struct mpath_path *, int);
int mpath_path_detach(struct mpath_path *);
void mpath_start(struct mpath_path *, struct scsi_xfer *);
struct device *mpath_bootdv(struct device *);
#endif /* _SYS_SCSI_MPATH_H_ */
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