For http://www.openbsd.org/faq/faq9.html :
diff -u faq9.html.orig faq9.html --- faq9.html.orig 2015-12-28 02:20:43.148113257 +0100 +++ faq9.html 2015-12-28 03:42:08.119953895 +0100 @@ -33,6 +33,7 @@ Edition-style) password file to BSD-style.</a> <li><a href= "#Interact">9.4 - Running Linux binaries on OpenBSD</a> <li><a href= "#Ext2FS">9.5 - Accessing your Linux files from OpenBSD</a> +<li><a href= "#UFSisFFS">9.6 - Accessing your OpenBSD files from Linux</a> </ul> For more information for Linux users, please refer to <a href=" http://sites.inka.de/mips/unix/bsdlinux.html";> http://sites.inka.de/mips/unix/bsdlinux.html</a>. @@ -381,6 +382,31 @@ EXT4. For further information, see <a href="faq14.html#foreignfs">FAQ 14</a>. +<h2 id="UFSisFFS">9.6 - Accessing your OpenBSD files from Linux</h2> + +<p> +While documenting the features of other operating systems is +technically out of scope for this FAQ, users migrating or +interoperating between Linux and OpenBSD may find themselves wanting to +access OpenBSD FFS partitions from Linux. Users are advised that at +least <a href="ftp://ftp.kernel.org/pub/linux/utils/util-linux/";>this +common Linux implementation</a> of mount refers to FFS as UFS (for more +names, <a href="http://en.wikipedia.org/wiki/Unix_File_System";>see +Wikipedia</a>), and that said mount command requires users to specify a +ufstype option of 44bsd, i.e. use <tt>-o ufstype=44bsd</tt> in addition +to <tt>-t ufs</tt>, because that program's FFS support defaults to a +ufstype of old, which is probably helpful to the fewest number of FFS +users. It may be a good idea to run <tt>dmesg|tail</tt> on the Linux +system after mounting. As of this writing, a helpful example of ufstype +option usage and a warning that an incorrect or omitted ufstype might +cause data corruption ("<i>Wrong ufstype may corrupt your filesystem, +default is ufstype=old</i>") may show up in the Linux dmesg, but is not +included in the corresponding mount man page.<br /> +The OpenBSD project does not audit the FFS support code of other +operating systems, so given a choice between accessing a Linux +partition from OpenBSD and accessing an OpenBSD partition from Linux, +the former may be preferable. <i>Caveat emptor.</i> + <p> <hr> <p>
