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