linux-kernel - Re: Race to power off harming SATA SSDs

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Message-ID: <CAFLxGvzAmURHU_6K3gmBfOqHKgvQOkkO_+qgMKsmzhWZwwGnqw@mail.gmail.com>
Date:   Mon, 8 May 2017 13:06:17 +0200
From:   Richard Weinberger <richard.weinberger@...il.com>
To:     Pavel Machek <pavel@....cz>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-ide@...r.kernel.org,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Tejun Heo <tj@...nel.org>
Subject: Re: Race to power off harming SATA SSDs

On Mon, May 8, 2017 at 12:49 PM, Pavel Machek <pavel@....cz> wrote:
> Aha, nice, so it looks like ubifs is a step back here.
>
> 'clean marker' is a good idea... empty pages have plenty of space.

If UBI (not UBIFS) faces an empty block, it also re-erases it.
The EC header is uses as clean marker.

> How do you handle the issue during regular write? Always ignore last
> successfully written block?

The last page of a block is inspected and allowed to be corrupted.

> Do you handle "paired pages" problem on MLC?

Nope, no MLC support in mainline so far.

-- 
Thanks,
//richard