Re: [PATCH 22/23] drbd: implement REQ_OP_WRITE_ZEROES

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On Thu, Mar 30 2017 at  7:44am -0400,
Christoph Hellwig <hch@xxxxxx> wrote:

> On Thu, Mar 30, 2017 at 12:06:41PM +0200, Lars Ellenberg wrote:
> 
> > Will it make an fstrim cause thinly provisioned
> > devices to suddenly be fully allocated?
> 
> Not for SCSI devices.  Yes for dm-thinp until it implements
> REQ_OP_WRITE_ZEROES, which will hopefully be soon.

I can work on this now.  Only question I have is: should DM thinp take
care to zero any misaligned head and tail?  (I assume so but with all
the back and forth between Bart, Paolo and Martin I figured I'd ask
explicitly).



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