Re: kern/38122: no sd? detach on firewire when disconnect harddisk

[David Huang <khym%azeotrope.org@localhost>]

On Feb 29, 2008, at 2:15 AM, mccratch%gmx.net@localhost wrote:
> When detaching sd?-firewire-node physically the kernel doesn't  
> detach the sd? device.  The firewire<->IDE controller is an Oxford  
> 911 bridge.  No such things happen when using the USB-part of that  
> controller.  No problems at all on Mac OS X with the controller &  
> firewire (so I assume the controller is working fine).


The sbp(4) manpage mentions:

     Some users familiar with umass(4) might wonder why the device is  
not
     detached at the scsi(4) layer when the device is unplugged.  It is
     detached only if the device has not been plugged again during  
several bus
     resets.  This is for preventing to detach an active file system  
even when
     the device cannot be probed correctly for some reason after a  
bus reset
     or when the device is temporary disconnected because the user  
changes the
     bus topology.  If you want to force to detach the device, run  
fwctl -r
     several times.

So, it's working as designed. I do think it's a bit counter-intuitive,  
but I can see how it'd be useful to be able to temporarily unplug the  
device and plug it back in without having to unmount the filesystem...
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