RUMP_EXT2FS(8) | System Manager's Manual | RUMP_EXT2FS(8) |
rump_ext2fs
—
file-system PUFFS
pseudo-device putter
rump_ext2fs |
[options] image mountpoint |
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).
rump_ext2fs
utility first appeared in
NetBSD 5.0.
November 21, 2010 | NetBSD 9.4 |