- NetBSD Manual Pages
RUMP_EXT2FS(8) NetBSD System Manager's Manual RUMP_EXT2FS(8)
Powered by man-cgi (2021-06-01).
Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
rump_ext2fs -- mount a ext2fs image with a userspace server
rump_ext2fs [options] image mountpoint
NOTE! This manual page describes features specific to the rump(3) file
server. Please see mount_ext2fs(8) for a full description of the avail-
able 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 com-
monly 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).
p2k(3), puffs(3), rump(3), mount_ext2fs(8)
The rump_ext2fs utility first appeared in NetBSD 5.0.
NetBSD 9.3 November 21, 2010 NetBSD 9.3