Re: kern/54733: ZFS warnings during default boot, even if no ZFS is in use

[Brad Spencer <brad%anduin.eldar.org@localhost>]

John Nemeth <jnemeth%cue.bc.ca@localhost> writes:

> The following reply was made to PR kern/54733; it has been noted by GNATS.
>

[snip]

>  } With /etc/rc.d/zfs trying to bring up ZFS pools early we now get scary
>  } warnings at boot time on machines that never saw a ZFS:
>  } 
>  } root file system type: ffs
>  } kern.module.path=/stand/evbarm/9.99.19/modules
>  } WARNING: ZFS on NetBSD is under development
>  } ZFS NOTICE: Prefetch is disabled by default if less than 4GB of RAM is present;
>  } to enable, add "vfs.zfs.prefetch_disable=0" to /boot/loader.conf.
>  } ZFS filesystem version: 5
>  } Lid Switch: lid opened.
>  
>       The "ZFS NOTICE" is clearly a FreeBSD specific message.
>  /boot/loader.conf doesn't exist on NetBSD.  Besides being noisy,
>  it is wrong.
>  
>  } It would be better if trying to use ZFS would be triggered by some config
>  } file, or the kernel be silent about the whole action (who cares what version
>  } is in use if it is not in use?)
>  
>       It could also be triggered by the first attempt to actually
>  use ZFS, i.e. the presence of a ZFS file system.
>  
>  } >How-To-Repeat:
>  } Boot current.
>  } 
>  }-- End of excerpt from martin%NetBSD.org@localhost
>  

Some of this is probably my fault...  won't have time to mess with this
right now, however...

The line in /etc/rc.d/zfs for starting zfs up:

        if [ -x /sbin/zfs -a -f /etc/zfs/zpool.cache ]; then

should probably be:

        if checkyesno zfs && [ -x /sbin/zfs -a -f /etc/zfs/zpool.cache ]; then

I think that this will have the effect of not trying to start anything
zfs if you have set not set zfs=YES in /etc/rc.conf.  I would still
leave the stop function alone, as you may wish to stop zfs after
changing a /etc/rc.conf.  My original assumption was that
/etc/zfs/zpool.cache would not exist if you had never used it, but there
is the case of it existing, but then disabling zfs use later in
/etc/rc.conf (not setting zfs=YES) and not removing the cache file.

I won't comment on the kernel message... yes, it has FreeBSDism in it
that does not apply.




-- 
Brad Spencer - brad%anduin.eldar.org@localhost - KC8VKS - http://anduin.eldar.org