Re: [PATCH V2 0/4] Add MMC erase and secure erase

From: Christoph Hellwig
Date: Mon Jun 14 2010 - 04:10:33 EST

On Sun, Jun 13, 2010 at 01:01:34PM +0300, Adrian Hunter wrote:
> Hi
> Add ability to do MMC erase and secure erase operations from userspace,
> using the BLKDISCARD ioctl and a newly created BLKSECDISCARD ioctl.

Have you done any measurement if the use of the block layer changes
performance of the discard requests for you? I'd really prefer to
send down the secure erase that way, too. This could easily be done
by having a DISCARD_SECURE rw flag, which just ORs another flag into
the request type field.

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