linux-ext4 - Re: [PATCH] ext4: Add support for SFITRIM, an ioctl for secure FITRIM.

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Message-ID: <CAKP4w2QSUYYFVeM2_a7iMybnad_A27WEx3K=qiMf-_namjvS-A@mail.gmail.com>
Date:	Tue, 17 Jun 2014 10:53:21 -0700
From:	JP Abgrall <jpa@...gle.com>
To:	"Theodore Ts'o" <tytso@....edu>
Cc:	Lukáš Czerner <lczerner@...hat.com>,
	Dave Chinner <david@...morbit.com>,
	Eric Sandeen <sandeen@...hat.com>, linux-ext4@...r.kernel.org,
	Geremy Condra <gcondra@...gle.com>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH] ext4: Add support for SFITRIM, an ioctl for secure FITRIM.

On Tue, Jun 17, 2014 at 6:54 AM, Theodore Ts'o <tytso@....edu> wrote:
>
> There's an assumption here that the eMMC SECDISCARD functionality is
> more competently spec'ed out compared to the ATA/SCSI interface.  I'm
> not sure whether or not that's true, but perhaps JP and Geremy can
> confirm that.
We only care about the eMMC spec. In the eMMC spec there is no room
for ignoring the commands. If the card declares it can do a secure
erase/trim it must do it as per the spec.
  JEDEC Standard No. 84-A441
  7.6.9 Secure Erase
  7.6.10 Secure Trim
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