rump_msdos(8) - NetBSD Manual Pages

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RUMP_MSDOS(8)           NetBSD System Manager's Manual           RUMP_MSDOS(8)


NAME

     rump_msdos -- mount the msdos file system using a userspace server


SYNOPSIS

     file-system PUFFS
     pseudo-device putter

     rump_msdos [options] special node


DESCRIPTION

     The rump_msdos utility can be used to mount msdos file systems.  It uses
     rump(3) and p2k(3) to facilitate running the file system as a server in
     userspace.  As opposed to mount_msdos(8), rump_msdos does not use file
     system code within the kernel and therefore does not require kernel sup-
     port 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 difference to using in-kernel code.

     In case mounting a file system image from a regular file, rump_msdos 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_msdos instead of mount_msdos(8).  Corrupt file system images com-
     monly cause the file system to crash the entire kernel, but with
     rump_msdos only the userspace server process will dump core.

     To use rump_msdos via mount(8), the flags -o rump and -t msdos should be
     given.  Similarly, rump_msdos is run instead of mount_msdos(8) if
     ``rump'' is added to the options field of fstab(5).

     Please see mount_msdos(8) for a full description of the available command
     line options.


SEE ALSO

     p2k(3), puffs(3), rump(3), mount_msdos(8)


HISTORY

     The rump_msdos utility first appeared in NetBSD 5.0.  It is currently
     considered experimental.

NetBSD 5.2                     February 15, 2009                    NetBSD 5.2