Re: [PATCH 1/4] block: Allow devices to indicate whether discarded blocks are zeroed

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On Sat, Nov 21, 2009 at 05:13:56AM -0500, Christoph Hellwig wrote:
> On Fri, Nov 20, 2009 at 09:45:21PM -0500, Martin K. Petersen wrote:
> > The discard ioctl is used by mkfs utilities to clear a block device
> > prior to putting metadata down.  However, not all devices return zeroed
> > blocks after a discard.  Some drives return stale data, potentially
> > containing old superblocks.  It is therefore important to know whether
> > discarded blocks are properly zeroed.
> 
> At least for mkfs.xfs we make sure to still zero the important areas
> after the TRIM ioctl anyway.

Could you change that to zero _before_ the TRIM?

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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