kern/127717: [ata] [patch] [request] - support write cache toggling per device

[sbruno at FreeBSD.org]

Synopsis: [ata] [patch] [request] - support write cache toggling per device

State-Changed-From-To: open->feedback
State-Changed-By: sbruno
State-Changed-When: Fri Apr 12 22:29:05 UTC 2013
State-Changed-Why: 
Ugh, it looks like this patch should have been committed a long time ago.

Turns out that atacontrol will be a dead thing soon and all of your options
will need to be sent through camcontrol.

CAM_ATA already supports this feature via:

kern.cam.ada.0.write_cache: -1

So, this patch will most likely be rejected.  

http://www.freebsd.org/cgi/query-pr.cgi?pr=127717