From mboxrd@z Thu Jan  1 00:00:00 1970
From: Adrian Hunter <adrian.hunter@intel.com>
Subject: Re: MMC block discard / erase ioctl
Date: Wed, 13 Mar 2013 09:59:17 +0200
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To: Mark Deneen <mdeneen@gmail.com>
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On 12/03/13 18:13, Mark Deneen wrote:
> I assume that this never made it into mainline?  I'm looking to do something
> similar, and I was wondering if it somehow did make it in but in a different
> form that I'm not seeing.

There is BLKDISCARD and BLKSECDISCARD

Perhaps MMC_IOC_CMD could be useful too