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 a msdos image with a userspace server


SYNOPSIS

     file-system PUFFS
     pseudo-device putter

     rump_msdos [options] image mountpoint


DESCRIPTION

     NOTE! This manual page describes features specific to the rump(3) file
     server.  Please see mount_msdos(8) for a full description of the avail-
     able command line options.

     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 there is no down-
     side with respect to in-kernel code.

     rump_msdos 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_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 used instead of mount_msdos(8) if
     ``rump'' is added to the options field of fstab(5).


SEE ALSO

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


HISTORY

     The rump_msdos utility first appeared in NetBSD 5.0.

NetBSD 8.2                     November 21, 2010                    NetBSD 8.2