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Dd November 21, 2010
Dt RUMP_MSDOS 8
Os
Sh NAME
Nm rump_msdos
Nd mount a msdos image with a userspace server
Sh SYNOPSIS
Cd "file-system PUFFS"
Cd "pseudo-device putter"
Pp
Nm
Op options
Ar image
Ar mountpoint
Sh DESCRIPTION
Em NOTE!
This manual page describes features specific to the
Xr rump 3
file server.
Please see
Xr mount_msdos 8
for a full description of the available command line options.
Pp
The
Nm
utility can be used to mount msdos file systems.
It uses
Xr rump 3
and
Xr p2k 3
to facilitate running the file system as a server in userspace.
As opposed to
Xr mount_msdos 8 ,
Nm
does not use file system code within the kernel and therefore does
not require kernel support except
Xr puffs 4 .
Apart from a minor speed penalty there is no downside with respect to
in-kernel code.
Pp
Nm
does not require using
Xr vnconfig 8
for mounts from regular files and the file path can be passed
directly as the
Ar image
parameter.
In fact, the use of
Xr vnconfig 8
is discouraged, since it is unable to properly deal with images on
sparse files.
Pp
In case the image contains multiple partitions, the desired partition
must be indicated by appending the token
Dq %DISKLABEL:p%
to the
Ar image
path.
The letter
Dq p
specifies the partition as obtained via
Xr disklabel 8 .
For example, to mount partition
Dq e
from image
Pa /tmp/wd0.img ,
use
Dq /tmp/wd0.img%DISKLABEL:e% .
Pp
It is recommended that untrusted file system images be mounted with
Nm
instead of
Xr mount_msdos 8 .
Corrupt file system images commonly cause the file system
to crash the entire kernel, but with
Nm
only the userspace server process will dump core.
Pp
To use
Nm
via
Xr mount 8 ,
the flags
Fl o Ar rump
and
Fl t Ar msdos
should be given.
Similarly,
Nm
is used instead of
Xr mount_msdos 8
if
Dq rump
is added to the options field of
Xr fstab 5 .
Sh SEE ALSO
Xr p2k 3 ,
Xr puffs 3 ,
Xr rump 3 ,
Xr mount_msdos 8
Sh HISTORY
The
Nm
utility first appeared in
Nx 5.0 .

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