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

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Message-ID: <alpine.LFD.2.00.1406191010020.2182@localhost.localdomain>
Date:	Thu, 19 Jun 2014 10:10:56 +0200 (CEST)
From:	Lukáš Czerner <lczerner@...hat.com>
To:	JP Abgrall <jpa@...gle.com>
cc:	"Theodore Ts'o" <tytso@....edu>,
	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 Wed, 18 Jun 2014, JP Abgrall wrote:

> Date: Wed, 18 Jun 2014 14:51:42 -0700
> From: JP Abgrall <jpa@...gle.com>
> To: Lukáš Czerner <lczerner@...hat.com>
> Cc: Theodore Ts'o <tytso@....edu>, 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 Wed, Jun 18, 2014 at 2:33 AM, Lukáš Czerner <lczerner@...hat.com> wrote:
> > Except when it does not. Looking at the mmc driver I can see that we
> > have already some devices where secure trim is broken.
> 
> And that is why we don't just blindly use random eMMC devices.

'we' as in ... ? Remember, you're not the only one using this code.

> 
> > Let's call is deep discard, or whatever but avoid the security word
> > at least when file system comes into play.
> 
> Best effort discard :)
> --
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