RUMP_SYSVBFS(8) | System Manager's Manual | RUMP_SYSVBFS(8) |
rump_sysvbfs
—
file-system PUFFS
pseudo-device putter
rump_sysvbfs |
[options] image mountpoint |
The rump_sysvbfs
utility can be used to
mount sysvbfs file systems. It uses
rump(3) and
p2k(3) to facilitate running the
file system as a server in userspace. As opposed to
mount_sysvbfs(8),
rump_sysvbfs
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_sysvbfs
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_sysvbfs
instead of
mount_sysvbfs(8).
Corrupt file system images commonly cause the file system to crash the
entire kernel, but with rump_sysvbfs
only the
userspace server process will dump core.
To use rump_sysvbfs
via
mount(8), the flags
-o
rump and
-t
sysvbfs should be given.
Similarly, rump_sysvbfs
is used instead of
mount_sysvbfs(8) if
“rump” is added to the options field of
fstab(5).
rump_sysvbfs
utility first appeared in
NetBSD 5.0.
November 21, 2010 | NetBSD 9.4 |