u9fs takes an optional argument to specify the root
of the file system to serve (defaulting to serving
the entire unix fs). this patch updates the man page
to reflect that.

Reference: /n/sources/patch/applied/u9fs-fsroot
Date: Fri Dec  4 19:09:31 CET 2009
Signed-off-by: a@9srv.net

--- /sys/man/4/u9fs	Fri Dec  4 19:08:18 2009
+++ /sys/man/4/u9fs	Fri Dec  4 19:08:16 2009
@@ -26,6 +26,7 @@
 .B -u
 .I onlyuser
 ]
+.I fsroot
 .SH DESCRIPTION
 .I U9fs
 is
@@ -164,6 +165,13 @@
 This is useful in some cases when running without
 .IR inetd ;
 see the examples.
+.PP
+If
+.I fsroot
+is specified,
+.I u9fs
+will serve only that tree; othwise, it will serve the entire Unix
+file system.
 .SH EXAMPLES
 .PP
 Plan 9 calls 9P file service
@@ -183,7 +191,8 @@
 and
 .IR bind (1).
 .PP
-.I U9fs
+By default,
+.I u9fs
 serves the entire file system of the Unix machine.
 It forbids access to devices
 because the program is single-threaded and may block unpredictably.