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

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On Sat, Nov 21, 2009 at 12:58:03PM -0700, Matthew Wilcox wrote:
> 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?

I could easily, but it would be a very bad idea.

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