Introduce the "ruleset=number" option for devfs(5) mounts.

Add support for updating the devfs mount (currently only changing the
ruleset number is supported).
Check mnt_optnew with vfs_filteropt(9).

This new option sets the specified ruleset number as the active ruleset
of the new devfs mount and applies all its rules at mount time. If the
specified ruleset doesn't exist, a new empty ruleset is created.

MFC after:	1 month

1 files changed, 24 insertions, 1 deletions

diff --git a/share/man/man5/devfs.5 b/share/man/man5/devfs.5
index 8c7e598..7b483fc 100644
--- a/share/man/man5/devfs.5
+++ b/share/man/man5/devfs.5
@@ -38,7 +38,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd September 18, 2010
+.Dd February 9, 2012
 .Dt DEVFS 5
 .Os
 .Sh NAME
@@ -90,6 +90,29 @@ and
 .Pa 2 .
 .Xr fdescfs 5
 creates files for all open descriptors.
+.Pp
+The options are as follows:
+.Bl -tag -width indent
+.It Fl o Ar options
+Use the specified mount
+.Ar options ,
+as described in
+.Xr mount 8 .
+The following devfs file system-specific options are available:
+.Bl -tag -width indent
+.It Cm ruleset Ns No = Ns Ar ruleset
+Set ruleset number
+.Ar ruleset
+as the current ruleset for the mount-point and apply all its rules. If the
+ruleset number
+.Ar ruleset
+does not exist, an empty ruleset with the number
+.Ar ruleset
+is created. See
+.Xr devfs 8
+for more information on working with devfs rulesets.
+.El
+.El
 .Sh FILES
 .Bl -tag -width /dev/XXXX -compact
 .It Pa /dev