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

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Message-ID: <CAKP4w2QzAJWX0_TchDsseKwrW_QeYJcqAk5+JFJoSpRmdJa_TQ@mail.gmail.com>
Date:	Thu, 12 Jun 2014 21:37:52 -0700
From:	JP Abgrall <jpa@...gle.com>
To:	Eric Sandeen <sandeen@...deen.net>
Cc:	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 Thu, Jun 12, 2014 at 8:24 PM, Eric Sandeen <sandeen@...deen.net> wrote:
> - I'm talking about whether or not it's a good idea at all;
> see for example Dave's reply.

I see. I'll reply to in his comments.

> This gets back to the "why" - what do you want to accomplish?
> When would a user use this?
> What if they have mounted -o discard,
> or already issued an FITRIM?

Android. No -o discard. A user should not be able to FITRIM.
The system would do the SFITRIM.

> What's the ultimate goal, here?
It was to make sure that data was not left behind after some steps were taken.
And one of the steps seemed to be to replace the FITRIM used in
Android with something better knowing that their was no -o discard
(see my reply to Dave Chinner).

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