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      1 /*	$NetBSD: fstrans.h,v 1.14 2020/05/13 09:21:30 hannken Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2007 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Juergen Hannken-Illjes.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * File system transaction operations.
     34  */
     35 
     36 #ifndef _SYS_FSTRANS_H_
     37 #define	_SYS_FSTRANS_H_
     38 
     39 #include <sys/mount.h>
     40 
     41 #define SUSPEND_SUSPEND	0x0001		/* VFS_SUSPENDCTL: suspend */
     42 #define SUSPEND_RESUME	0x0002		/* VFS_SUSPENDCTL: resume */
     43 
     44 enum fstrans_state {
     45 	FSTRANS_NORMAL,
     46 	FSTRANS_SUSPENDED,
     47 	FSTRANS_SUSPENDING
     48 };
     49 
     50 void	fstrans_init(void);
     51 void	fstrans_lwp_dtor(lwp_t *);
     52 void	fstrans_start(struct mount *);
     53 int	fstrans_start_nowait(struct mount *);
     54 void	fstrans_start_lazy(struct mount *);
     55 void	fstrans_done(struct mount *);
     56 int	fstrans_held(struct mount *);
     57 int	fstrans_is_owner(struct mount *);
     58 int	fstrans_mount(struct mount *);
     59 void	fstrans_unmount(struct mount *);
     60 
     61 int	fstrans_setstate(struct mount *, enum fstrans_state);
     62 enum fstrans_state fstrans_getstate(struct mount *);
     63 
     64 int	fscow_establish(struct mount *, int (*)(void *, struct buf *, bool),
     65 	    void *);
     66 int	fscow_disestablish(struct mount *, int (*)(void *, struct buf *, bool),
     67 	    void *);
     68 int	fscow_run(struct buf *, bool);
     69 
     70 int	vfs_suspend(struct mount *, int);
     71 void	vfs_resume(struct mount *);
     72 
     73 #endif /* _SYS_FSTRANS_H_ */
     74