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
HISTORY
The rump_ffs utility first appeared in
NetBSD 5.0.