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

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On Mon, Nov 23, 2009 at 12:02:48PM -0500, Ric Wheeler wrote:
> I agree - the discard of the whole device is a good idea.
>
> I just want to make clear that "discard block X; write block X with 
> zeroed data" undoes the discard in general :-)

We can skip the writing of zeroes if we know the device returns zeroed
blocks after a trim.  Martin's patch exports that information to
userspace, and once we have a nice enough interface (e.g. blkid or an
ioctl) we can actually use it in mkfs to optimize the writing of zeroes
away.  Raw growling in sysfs is a bit too nasty to add it to mkfs for
those few blocks IMHO.

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