NAME
rump_ext2fs —
mount a ext2fs image with
a userspace server
SYNOPSIS
file-system PUFFS
pseudo-device putter
rump_ext2fs |
[options] image
mountpoint |
DESCRIPTION
NOTE! This manual page describes features specific to the
rump(3) file server. Please see
mount_ext2fs(8) for a full
description of the available command line options.
The
rump_ext2fs utility can be used to mount ext2fs file
systems. It uses
rump(3) and
p2k(3) to facilitate running the
file system as a server in userspace. As opposed to
mount_ext2fs(8),
rump_ext2fs 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_ext2fs 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_ext2fs instead of
mount_ext2fs(8). Corrupt
file system images commonly cause the file system to crash the entire kernel,
but with
rump_ext2fs only the userspace server process will
dump core.
To use
rump_ext2fs via
mount(8), the flags
-o rump and
-t
ext2fs should be given. Similarly,
rump_ext2fs is used instead of
mount_ext2fs(8) if
“rump” is added to the options field of
fstab(5).
SEE ALSO
p2k(3),
puffs(3),
rump(3),
mount_ext2fs(8)
HISTORY
The
rump_ext2fs utility first appeared in
NetBSD 5.0.