[CFR][DEVFS] Add "ruleset" mount option

[Konstantin Belousov]

On Mon, Feb 06, 2012 at 10:26:17AM +0100, Martin Matuska wrote:
> The devfs(8) command supports configuring specific rulesets for devfs(5)
> mounts.
> However, it operates on already mounted devfs filesystems only and it is
> impossible to configure a specific ruleset on mount-time.
> 
> The attached patch adds a "ruleset" mount option to devfs mounts.
> The ruleset is automatically applied upon mount time. If the ruleset
> doesn't exist, an empty ruleset with the given numer is created and
> can be modified with devfs(8) later.
> 
> The patch is also available at:
> http://people.freebsd.org/~mm/patches/devfs/devfs_mount_ruleset.patch
> 
> Please review and/or comment my attached patch.
> 
Did you tested this with witness turned on ? It seems not.
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