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