/*      $NetBSD: fstrans.h,v 1.14 2020/05/13 09:21:30 hannken Exp $     */

/*-
 * Copyright (c) 2007 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Juergen Hannken-Illjes.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * File system transaction operations.
 */

#ifndef _SYS_FSTRANS_H_
#define _SYS_FSTRANS_H_

#include <sys/mount.h>

#define SUSPEND_SUSPEND 0x0001          /* VFS_SUSPENDCTL: suspend */
#define SUSPEND_RESUME  0x0002          /* VFS_SUSPENDCTL: resume */

enum fstrans_state {
        FSTRANS_NORMAL,
        FSTRANS_SUSPENDED,
        FSTRANS_SUSPENDING
};

void    fstrans_init(void);
void    fstrans_lwp_dtor(lwp_t *);
void    fstrans_start(struct mount *);
int     fstrans_start_nowait(struct mount *);
void    fstrans_start_lazy(struct mount *);
void    fstrans_done(struct mount *);
int     fstrans_held(struct mount *);
int     fstrans_is_owner(struct mount *);
int     fstrans_mount(struct mount *);
void    fstrans_unmount(struct mount *);

int     fstrans_setstate(struct mount *, enum fstrans_state);
enum fstrans_state fstrans_getstate(struct mount *);

int     fscow_establish(struct mount *, int (*)(void *, struct buf *, bool),
            void *);
int     fscow_disestablish(struct mount *, int (*)(void *, struct buf *, bool),
            void *);
int     fscow_run(struct buf *, bool);

int     vfs_suspend(struct mount *, int);
void    vfs_resume(struct mount *);

#endif /* _SYS_FSTRANS_H_ */