NAME
rump_ffs —
mount a ffs image with a
userspace server
SYNOPSIS
file-system PUFFS
pseudo-device putter
rump_ffs |
[options] image
mountpoint |
DESCRIPTION
NOTE! This manual page describes features specific to the
rump(3) file server. Please see
mount_ffs(8) for a full
description of the available command line options.
The
rump_ffs utility can be used to mount ffs file systems. It
uses
rump(3) and
p2k(3) to facilitate running the
file system as a server in userspace. As opposed to
mount_ffs(8),
rump_ffs 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_ffs does not require using
vnconfig(8) for mounts from
regular files and the file path can be passed directly as the
image parameter. 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_ffs instead of
mount_ffs(8). Corrupt file
system images commonly cause the file system to crash the entire kernel, but
with
rump_ffs only the userspace server process will dump
core.
To use
rump_ffs via
mount(8), the flags
-o rump and
-t
ffs should be given. Similarly,
rump_ffs is used instead of
mount_ffs(8) if
“rump” is added to the options field of
fstab(5).
SEE ALSO
p2k(3),
puffs(3),
rump(3),
mount_ffs(8)
HISTORY
The
rump_ffs utility first appeared in
NetBSD
5.0.