rump_ffs [options] special node
In case mounting a file system image from a regular file, rump_ffs does not require the use of vnconfig(8) unlike kernel file systems. Instead, the image path can be directly passed as the special file path. The exception is if the image contains a disklabel. In this case vnconfig is required to resolve the start offset for the correct partition within the image.
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 run instead of mount_ffs(8) if ``rump'' is added to the options field of fstab(5).
Please see mount_ffs(8) for a full description of the available command line options.