Add a stub file so that snapshot support can be compiled out.
Will allow INSTALL_TINY to fit back in its designated space. Since the calling code doesn't allow a snapshot mount to fail, this code will output a warning and delete any snapshots it finds. This only happend on rw mounts - snapshots don't seem to be created when mounting ro. The whole way the snapshots gets mounted is a PITA anyway, the superblock 'last mounted' time should be used to validate that the fs hasn't been mounted elsewhere.
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dsl
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145
sys/ufs/ffs/ffs_snapshot_stub.c
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145
sys/ufs/ffs/ffs_snapshot_stub.c
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/*
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* Copyright 2000 Marshall Kirk McKusick. All Rights Reserved.
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*
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* Further information about snapshots can be obtained from:
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*
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* Marshall Kirk McKusick http://www.mckusick.com/softdep/
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* 1614 Oxford Street mckusick@mckusick.com
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* Berkeley, CA 94709-1608 +1-510-843-9542
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* USA
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY MARSHALL KIRK MCKUSICK ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL MARSHALL KIRK MCKUSICK BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ffs_snapshot.c 8.11 (McKusick) 7/23/00
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*
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* from FreeBSD: ffs_snapshot.c,v 1.79 2004/02/13 02:02:06 kuriyama Exp
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ffs_snapshot_stub.c,v 1.1 2005/02/10 22:22:32 dsl Exp $");
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#if defined(_KERNEL_OPT)
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#include "opt_ffs.h"
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#endif
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/buf.h>
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#include <sys/proc.h>
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#include <sys/namei.h>
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#include <sys/sched.h>
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#include <sys/stat.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/resource.h>
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#include <sys/resourcevar.h>
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#include <sys/vnode.h>
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#include <miscfs/specfs/specdev.h>
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#include <ufs/ufs/quota.h>
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#include <ufs/ufs/ufsmount.h>
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#include <ufs/ufs/inode.h>
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#include <ufs/ufs/ufs_extern.h>
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#include <ufs/ufs/ufs_bswap.h>
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#include <ufs/ffs/fs.h>
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#include <ufs/ffs/ffs_extern.h>
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/*
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* Create a snapshot file and initialize it for the filesystem.
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* Vnode is locked on entry and return.
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*/
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int
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ffs_snapshot(struct mount *mp, struct vnode *vp, struct timespec *ctime)
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{
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return ENODEV;
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}
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/*
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* Decrement extra reference on snapshot when last name is removed.
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* It will not be freed until the last open reference goes away.
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*/
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void
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ffs_snapgone(struct inode *ip)
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{
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}
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/*
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* Prepare a snapshot file for being removed.
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*/
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void
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ffs_snapremove(struct vnode *vp)
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{
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}
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/*
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* Notification that a block is being freed. Return zero if the free
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* should be allowed to proceed. Return non-zero if the snapshot file
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* wants to claim the block. The block will be claimed if it is an
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* uncopied part of one of the snapshots. It will be freed if it is
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* either a BLK_NOCOPY or has already been copied in all of the snapshots.
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* If a fragment is being freed, then all snapshots that care about
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* it must make a copy since a snapshot file can only claim full sized
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* blocks. Note that if more than one snapshot file maps the block,
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* we can pick one at random to claim it. Since none of the snapshots
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* can change, we are assurred that they will all see the same unmodified
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* image. When deleting a snapshot file (see ffs_snapremove above), we
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* must push any of these claimed blocks to one of the other snapshots
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* that maps it. These claimed blocks are easily identified as they will
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* have a block number equal to their logical block number within the
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* snapshot. A copied block can never have this property because they
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* must always have been allocated from a BLK_NOCOPY location.
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*/
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int
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ffs_snapblkfree(struct fs *fs, struct vnode *devvp, daddr_t bno, long size, ino_t inum)
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{
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return 0;
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}
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/*
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* Associate snapshot files when mounting.
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*/
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void
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ffs_snapshot_mount(struct mount *mp)
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{
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struct ufsmount *ump = VFSTOUFS(mp);
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struct fs *fs = ump->um_fs;
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int snaploc;
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printf("ffs_snapshot_mount: snapshots not supported, being deleted\n");
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for (snaploc = 0; snaploc < FSMAXSNAP; snaploc++)
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fs->fs_snapinum[snaploc] = 0;
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}
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/*
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* Disassociate snapshot files when unmounting.
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*/
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void
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ffs_snapshot_unmount(struct mount *mp)
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{
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}
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