99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
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/* $NetBSD: ffs_snapshot.stub.c,v 1.1 2004/05/25 14:54:59 hannken Exp $ */
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ffs_snapshot.stub.c,v 1.1 2004/05/25 14:54:59 hannken Exp $");
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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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*/
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int
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ffs_snapshot(struct mount *mp, struct vnode *vp, struct timespec *ts)
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{
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return EOPNOTSUPP;
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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,
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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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}
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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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