rump_nfs(8)
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RUMP_NFS(8) NetBSD System Manager's Manual RUMP_NFS(8)
NAME
rump_nfs -- mount the nfs file system using a userspace server
SYNOPSIS
file-system PUFFS
pseudo-device putter
rump_nfs [options] special node
DESCRIPTION
The rump_nfs utility can be used to mount nfs file systems. It uses
rump(3) and p2k(3) to facilitate running the file system as a server in
userspace. As opposed to mount_nfs(8), rump_nfs 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 (starting from 10% and
depending on the workload and file system in question), there is no dif-
ference to using in-kernel code.
In case mounting a file system image from a regular file, rump_nfs does
not require the use of vnconfig(8) unlike kernel file systems. Instead,
the image path can be directly passed as the special file path. The
exception is if the image contains a disklabel. In this case vnconfig is
required to resolve the start offset for the correct partition within the
image.
It is recommended that untrusted file system images be mounted with
rump_nfs instead of mount_nfs(8). Corrupt file system images commonly
cause the file system to crash the entire kernel, but with rump_nfs only
the userspace server process will dump core.
To use rump_nfs via mount(8), the flags -o rump and -t nfs should be
given. Similarly, rump_nfs is run instead of mount_nfs(8) if ``rump'' is
added to the options field of fstab(5).
Please see mount_nfs(8) for a full description of the available command
line options.
SEE ALSO
p2k(3), puffs(3), rump(3), mount_nfs(8)
HISTORY
The rump_nfs utility first appeared in NetBSD 5.0. It is currently con-
sidered experimental.
NetBSD 5.1 February 15, 2009 NetBSD 5.1
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