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RUMP_FFS(8) NetBSD System Manager's Manual RUMP_FFS(8)
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rump_ffs -- mount a ffs image with a userspace server
rump_ffs [options] image mountpoint
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 prop-
erly 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).
p2k(3), puffs(3), rump(3), mount_ffs(8)
The rump_ffs utility first appeared in NetBSD 5.0.
NetBSD 9.1 November 21, 2010 NetBSD 9.1