8c21bc6224
- Not enabled by default. Needs kernel option FFS_SNAPSHOT.
- Change parameters of ffs_blkfree.
- Let the copy-on-write functions return an error so spec_strategy
may fail if the copy-on-write fails.
- Change genfs_*lock*() to use vp->v_vnlock instead of &vp->v_lock.
- Add flag B_METAONLY to VOP_BALLOC to return indirect block buffer.
- Add a function ffs_checkfreefile needed for snapshot creation.
- Add special handling of snapshot files:
Snapshots may not be opened for writing and the attributes are read-only.
Use the mtime as the time this snapshot was taken.
Deny mtime updates for snapshot files.
- Add function transferlockers to transfer any waiting processes from
one lock to another.
- Add vfsop VFS_SNAPSHOT to take a snapshot and make it accessible through
a vnode.
- Add snapshot support to ls, fsck_ffs and dump.
Welcome to 2.0F.
Approved by: Jason R. Thorpe <thorpej@netbsd.org>
169 lines
4.2 KiB
Groff
169 lines
4.2 KiB
Groff
.\" $NetBSD: fssconfig.8,v 1.4 2004/05/25 14:55:47 hannken Exp $ */
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.\"
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.\"
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.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Juergen Hannken-Illjes.
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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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.\" 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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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd May 25, 2004
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.Dt FSSCONFIG 8
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.Os
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.Sh NAME
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.Nm fssconfig
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.Nd configure file system snapshot devices
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.Sh SYNOPSIS
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.Nm
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.Op Fl cxv
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.Ar device
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.Ar path
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.Ar backup
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.Op Ar cluster Op Ar size
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.Nm
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.Fl u Op Fl v
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.Ar device
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.Nm
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.Fl l Op Fl v
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.Op Ar device
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.Sh DESCRIPTION
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The
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.Nm
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command configures file system snapshot pseudo disk devices.
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It will associate the file system snapshot disk
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.Ar device
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with a snapshot of
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.Ar path
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allowing the latter to be accessed as though it were a disk.
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Data written through the
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.Ar path
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will be saved in
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.Ar backup
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which must not reside on the snapshotted file system.
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If
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.Ar backup
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is a regular file, it will be created with length
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.Ar size .
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Default size is the size of
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.Ar path .
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Data is saved to
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.Ar backup
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in units of
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.Ar cluster
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bytes.
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.Pp
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Options indicate an action to be performed:
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.Bl -tag -width 3n
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.It Fl c
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Configures the device.
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If successful, references to
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.Ar device
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will access the contents of
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.Ar path
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at the time the snapshot was taken.
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If
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.Ar backup
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is a directory, a temporary file will be created in this directory.
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This file will be unlinked on exit.
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.It Fl l
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List the snapshot devices and indicate which ones are in use.
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If a specific
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.Ar device
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is given, then only that will be described.
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.It Fl u
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Unconfigures the
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.Ar device .
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.It Fl v
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Be more verbose listing the snapshot devices.
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.It Fl x
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Unlink
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.Ar backup
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after the
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.Ar device
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is configured.
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.El
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.Pp
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If no action option is given,
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.Fl c
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is assumed.
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.Sh FILES
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.Bl -tag -width /etc/disktab -compact
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.It Pa /dev/rfss?
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.It Pa /dev/fss?
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.El
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.Sh EXAMPLES
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.Dl fssconfig fss0 /usr /tmp/back
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.Pp
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Configures the snapshot device
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.Pa fss0
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for a snapshot of the
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.Pa /usr
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file system.
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Data written through
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.Pa /usr
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will be backed up in
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.Pa /tmp/back .
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.Pp
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.Dl fssconfig fss1 / /dev/rsd0e 8192
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.Pp
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Configures the snapshot device
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.Pa fss1
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for a snapshot of the
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.Pa /
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file system.
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Data written through
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.Pa /
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will be backed up in
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.Pa /dev/rsd0e .
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The backup will take place in units of 8192 bytes.
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.Pp
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.Dl fssconfig -u fss0
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.Pp
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Unconfigures the
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.Pa fss0
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device.
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.Sh SEE ALSO
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.Xr opendisk 3 ,
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.Xr fss 4 ,
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.Xr mount 8 ,
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.Xr umount 8
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Nx 2.0 .
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.Sh BUGS
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The
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.Xr fss 4
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driver is
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.Em experimental .
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Be sure you have a backup before you use it.
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