Re: CVS commit: src/sys/kern

[Roy Marples <roy%marples.name@localhost>]

On 13/04/2020 16:31, Andrew Doran wrote:
> Hi Roy.
>
> On Sat, Apr 11, 2020 at 02:13:06AM +0100, Roy Marples wrote:
> > On 10/04/2020 23:34, Andrew Doran wrote:
> > > Module Name:	src
> > > Committed By:	ad
> > > Date:		Fri Apr 10 22:34:36 UTC 2020
> > >
> > > Modified Files:
> > > 	src/sys/kern: vfs_mount.c
> > >
> > > Log Message:
> > > vfs_mountroot(): don't needlessly grab a second reference to the root vnode
> > > (the kernel never chdirs) nor a lock on it.
> >
> > So the kernel chrooting to sysctl init.root is still ok?
>
> How is that accomplished?  I couldn't find the code and don't recall seeing
> it.

sysctl -w init.root=/altroot

See the ZFS Root ramdisk:
https://nxr.netbsd.org/xref/src/distrib/common/zfsroot.rc#33

I tested kernel from yesterdays sources and it still works fine, so I guess 
nothing was needed here.

Roy