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/* $OpenBSD: mpathvar.h,v 1.3 2011/07/11 01:02:48 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_dev;
struct mpath_group;
struct mpath_ops {
char op_name[16];
int (*op_checksense)(struct scsi_xfer *);
int (*op_online)(struct scsi_link *);
int (*op_offline)(struct scsi_link *);
int op_schedule;
};
#define MPATH_ROUNDROBIN 0 /* use all active paths */
#define MPATH_NEXT MPATH_ROUNDROBIN
#define MPATH_MRU 1 /* use most recently used path */
struct mpath_path {
/* the path driver must set these */
struct scsi_xshandler p_xsh;
struct scsi_link *p_link;
int p_gid;
/* the follwoing are private to mpath.c */
TAILQ_ENTRY(mpath_path) p_entry;
struct mpath_dev *p_dev;
int p_state;
};
int mpath_path_probe(struct scsi_link *);
int mpath_path_attach(struct mpath_path *,
const struct mpath_ops *);
void mpath_path_state(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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