113 lines
3.2 KiB
Groff
113 lines
3.2 KiB
Groff
.\" $NetBSD: rump_ffs.8,v 1.8 2009/02/15 18:01:26 pooka Exp $
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.\"
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.\" WARNING: GENERATED FILE, DO NOT EDIT
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.\" INSTEAD, EDIT makerumpmanpages.sh AND REGEN
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.\"
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.\" Copyright (c) 2008 Antti Kantee. All rights reserved.
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR 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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.Dd February 15, 2009
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.Dt RUMP_FFS 8
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.Os
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.Sh NAME
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.Nm rump_ffs
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.Nd mount the ffs file system using a userspace server
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.Sh SYNOPSIS
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.Cd "file-system PUFFS"
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.Cd "pseudo-device putter"
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.Pp
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.Nm
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.Op options
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.Ar special
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.Ar node
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.Sh DESCRIPTION
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The
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.Nm
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utility can be used to mount ffs file systems.
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It uses
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.Xr rump 3
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and
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.Xr p2k 3
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to facilitate running the file system as a server in userspace.
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As opposed to
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.Xr mount_ffs 8 ,
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.Nm
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does not use file system code within the kernel and therefore does
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not require kernel support except
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.Xr puffs 4 .
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Apart from a minor speed penalty (starting from 10% and depending
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on the workload and file system in question), there is no difference
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to using in-kernel code.
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.Pp
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In case mounting a file system image from a regular file,
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.Nm
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does not require the use of
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.Xr vnconfig 8
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unlike kernel file systems.
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Instead, the image path can be directly passed as the special file path.
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The exception is if the image contains a disklabel.
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In this case vnconfig is required to resolve the start offset for the
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correct partition within the image.
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.Pp
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It is recommended that untrusted file system images be mounted with
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.Nm
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instead of
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.Xr mount_ffs 8 .
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Corrupt file system images commonly cause the file system
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to crash the entire kernel, but with
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.Nm
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only the userspace server process will dump core.
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.Pp
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To use
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.Nm
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via
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.Xr mount 8 ,
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the flags
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.Fl o Ar rump
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and
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.Fl t Ar ffs
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should be given.
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Similarly,
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.Nm
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is run instead of
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.Xr mount_ffs 8
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if
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.Dq rump
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is added to the options field of
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.Xr fstab 5 .
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.Pp
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Please see
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.Xr mount_ffs 8
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for a full description of the available command line options.
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.Sh SEE ALSO
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.Xr p2k 3 ,
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.Xr puffs 3 ,
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.Xr rump 3 ,
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.Xr mount_ffs 8
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.Sh HISTORY
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The
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.Nm
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utility first appeared in
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.Nx 5.0 .
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It is currently considered experimental.
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