19a54bbb5SSascha Wildner.\" 29a54bbb5SSascha Wildner.\" Copyright (c) 2008 Daniel Gerzo 39a54bbb5SSascha Wildner.\" All rights reserved. 49a54bbb5SSascha Wildner.\" 59a54bbb5SSascha Wildner.\" Redistribution and use in source and binary forms, with or without 69a54bbb5SSascha Wildner.\" modification, are permitted provided that the following conditions 79a54bbb5SSascha Wildner.\" are met: 89a54bbb5SSascha Wildner.\" 1. Redistributions of source code must retain the above copyright 99a54bbb5SSascha Wildner.\" notice, this list of conditions and the following disclaimer. 109a54bbb5SSascha Wildner.\" 2. Redistributions in binary form must reproduce the above copyright 119a54bbb5SSascha Wildner.\" notice, this list of conditions and the following disclaimer in the 129a54bbb5SSascha Wildner.\" documentation and/or other materials provided with the distribution. 139a54bbb5SSascha Wildner.\" 149a54bbb5SSascha Wildner.\" THIS DOCUMENTATION IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 159a54bbb5SSascha Wildner.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 169a54bbb5SSascha Wildner.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 179a54bbb5SSascha Wildner.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 189a54bbb5SSascha Wildner.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 199a54bbb5SSascha Wildner.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 209a54bbb5SSascha Wildner.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 219a54bbb5SSascha Wildner.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 229a54bbb5SSascha Wildner.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 239a54bbb5SSascha Wildner.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 249a54bbb5SSascha Wildner.\" 259a54bbb5SSascha Wildner.\" $FreeBSD: src/share/man/man5/nullfs.5,v 1.1 2008/10/05 18:57:27 danger Exp $ 269a54bbb5SSascha Wildner.\" 279a54bbb5SSascha Wildner.Dd March 20, 2010 289a54bbb5SSascha Wildner.Dt NULL 5 299a54bbb5SSascha Wildner.Os 309a54bbb5SSascha Wildner.Sh NAME 319a54bbb5SSascha Wildner.Nm nullfs 329a54bbb5SSascha Wildner.Nd "null file system" 339a54bbb5SSascha Wildner.Sh SYNOPSIS 34*3856b434SSascha WildnerTo compile this driver into your kernel, 35*3856b434SSascha Wildnerplace the following lines in your kernel configuration file: 369a54bbb5SSascha Wildner.Bd -ragged -offset indent 379a54bbb5SSascha Wildner.Cd "options NULLFS" 389a54bbb5SSascha Wildner.Ed 399a54bbb5SSascha Wildner.Pp 409a54bbb5SSascha WildnerAlternatively, to load the driver as a 419a54bbb5SSascha Wildnermodule at boot time, place the following line in 429a54bbb5SSascha Wildner.Xr loader.conf 5 : 439a54bbb5SSascha Wildner.Bd -literal -offset indent 449a54bbb5SSascha Wildnernull_load="YES" 459a54bbb5SSascha Wildner.Ed 469a54bbb5SSascha Wildner.Sh DESCRIPTION 479a54bbb5SSascha WildnerThe 489a54bbb5SSascha Wildner.Nm 499a54bbb5SSascha Wildnerdriver will permit the 509a54bbb5SSascha Wildner.Dx 519a54bbb5SSascha Wildnerkernel to mount a loopback file system sub-tree. 529a54bbb5SSascha Wildner.Sh EXAMPLES 539a54bbb5SSascha WildnerTo mount a 549a54bbb5SSascha Wildner.Nm 559a54bbb5SSascha Wildnerfile system: 569a54bbb5SSascha Wildner.Pp 579a54bbb5SSascha Wildner.Dl "mount_null /usr/src /home/devel/src" 589a54bbb5SSascha Wildner.Sh SEE ALSO 599a54bbb5SSascha Wildner.Xr fstab 5 , 609a54bbb5SSascha Wildner.Xr mount_null 8 619a54bbb5SSascha Wildner.Sh HISTORY 629a54bbb5SSascha WildnerThe 639a54bbb5SSascha Wildner.Nm 649a54bbb5SSascha Wildnerlayer first appeared in 659a54bbb5SSascha Wildner.Bx 4.4 . 669a54bbb5SSascha Wildner.Sh AUTHORS 679a54bbb5SSascha Wildner.An -nosplit 689a54bbb5SSascha WildnerThe 699a54bbb5SSascha Wildner.Nm 709a54bbb5SSascha Wildnerkernel implementation was written by 719a54bbb5SSascha Wildner.An John Heideman . 729a54bbb5SSascha Wildner.Pp 739a54bbb5SSascha WildnerThis manual page was written by 74c616d378SFranco Fichtner.An Daniel Gerzo Aq Mt danger@FreeBSD.org . 75