rump_sysvbfs(8) - NetBSD Manual Pages

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


NAME

     rump_sysvbfs -- mount the sysvbfs file system using a userspace server


SYNOPSIS

     file-system PUFFS
     pseudo-device putter

     rump_sysvbfs [options] special node


DESCRIPTION

     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 (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_sysvbfs
     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 vncon-
     fig 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_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 run instead of mount_sysvbfs(8) if
     ``rump'' is added to the options field of fstab(5).

     Please see mount_sysvbfs(8) for a full description of the available com-
     mand line options.


SEE ALSO

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


HISTORY

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

NetBSD 5.2.3                   February 15, 2009                  NetBSD 5.2.3