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      1 /*	$NetBSD: ulfs_snapshot.c,v 1.4 2020/09/05 16:30:13 riastradh Exp $	*/
      2 /*  from ffs_snapshot.c,v 1.122 2013/05/07 09:40:54 hannken Exp  */
      3 
      4 /*
      5  * Copyright 2000 Marshall Kirk McKusick. All Rights Reserved.
      6  *
      7  * Further information about snapshots can be obtained from:
      8  *
      9  *	Marshall Kirk McKusick		http://www.mckusick.com/softdep/
     10  *	1614 Oxford Street		mckusick (at) mckusick.com
     11  *	Berkeley, CA 94709-1608		+1-510-843-9542
     12  *	USA
     13  *
     14  * Redistribution and use in source and binary forms, with or without
     15  * modification, are permitted provided that the following conditions
     16  * are met:
     17  *
     18  * 1. Redistributions of source code must retain the above copyright
     19  *    notice, this list of conditions and the following disclaimer.
     20  * 2. Redistributions in binary form must reproduce the above copyright
     21  *    notice, this list of conditions and the following disclaimer in the
     22  *    documentation and/or other materials provided with the distribution.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND ANY
     25  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     26  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     27  * DISCLAIMED.  IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE FOR
     28  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     34  * SUCH DAMAGE.
     35  *
     36  *	@(#)ffs_snapshot.c	8.11 (McKusick) 7/23/00
     37  *
     38  *	from FreeBSD: ffs_snapshot.c,v 1.79 2004/02/13 02:02:06 kuriyama Exp
     39  */
     40 
     41 #include <sys/cdefs.h>
     42 __KERNEL_RCSID(0, "$NetBSD: ulfs_snapshot.c,v 1.4 2020/09/05 16:30:13 riastradh Exp $");
     43 
     44 #if defined(_KERNEL_OPT)
     45 #include "opt_lfs.h"
     46 #endif
     47 
     48 #include <sys/param.h>
     49 #include <sys/kernel.h>
     50 #include <sys/systm.h>
     51 #include <sys/conf.h>
     52 #include <sys/buf.h>
     53 #include <sys/proc.h>
     54 #include <sys/namei.h>
     55 #include <sys/sched.h>
     56 #include <sys/stat.h>
     57 #include <sys/malloc.h>
     58 #include <sys/mount.h>
     59 #include <sys/resource.h>
     60 #include <sys/resourcevar.h>
     61 #include <sys/vnode.h>
     62 #include <sys/kauth.h>
     63 #include <sys/fstrans.h>
     64 
     65 #include <miscfs/specfs/specdev.h>
     66 
     67 #include <ufs/lfs/ulfs_quotacommon.h>
     68 #include <ufs/lfs/ulfsmount.h>
     69 #include <ufs/lfs/ulfs_inode.h>
     70 #include <ufs/lfs/ulfs_extern.h>
     71 #include <ufs/lfs/ulfs_bswap.h>
     72 
     73 #include <ufs/lfs/lfs.h>
     74 #include <ufs/lfs/lfs_extern.h>
     75 
     76 /*
     77  * Decrement extra reference on snapshot when last name is removed.
     78  * It will not be freed until the last open reference goes away.
     79  */
     80 void
     81 ulfs_snapgone(struct inode *ip)
     82 {
     83 	(void)ip;
     84 	/* just panic */
     85 	panic("reached ulfs_snapgone\n");
     86 }
     87