rump_ext2fs(8) - NetBSD Manual Pages

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RUMP_EXT2FS(8)          NetBSD System Manager's Manual          RUMP_EXT2FS(8)


NAME

     rump_ext2fs -- mount the ext2fs file system using a userspace server


SYNOPSIS

     file-system PUFFS
     pseudo-device putter

     rump_ext2fs [options] special node


DESCRIPTION

     The rump_ext2fs utility can be used to mount ext2fs file systems.  It
     uses rump(3) and p2k(3) to facilitate running the file system as a server
     in userspace.  As opposed to mount_ext2fs(8), rump_ext2fs 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_ext2fs
     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_ext2fs instead of mount_ext2fs(8).  Corrupt file system images com-
     monly cause the file system to crash the entire kernel, but with
     rump_ext2fs only the userspace server process will dump core.

     To use rump_ext2fs via mount(8), the flags -o rump and -t ext2fs should
     be given.  Similarly, rump_ext2fs is run instead of mount_ext2fs(8) if
     ``rump'' is added to the options field of fstab(5).

     Please see mount_ext2fs(8) for a full description of the available com-
     mand line options.


SEE ALSO

     p2k(3), puffs(3), rump(3), mount_ext2fs(8)


HISTORY

     The rump_ext2fs utility first appeared in NetBSD 5.0.  It is currently
     considered experimental.

NetBSD 5.1                     February 15, 2009                    NetBSD 5.1