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

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Message-ID: <20170508135529.172b7009@bbrezillon>
Date:   Mon, 8 May 2017 13:55:29 +0200
From:   Boris Brezillon <boris.brezillon@...e-electrons.com>
To:     Richard Weinberger <richard.weinberger@...il.com>
Cc:     Pavel Machek <pavel@....cz>, David Woodhouse <dwmw2@...radead.org>,
        "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, 8 May 2017 13:48:07 +0200
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:

> On Mon, 8 May 2017 13:06:17 +0200
> Richard Weinberger <richard.weinberger@...il.com> wrote:
> 
> > 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.  
> 
> Unfortunately, that's not the case, though UBI can easily be patched
> to do that (see below).

Sorry for the noise, I was wrong, UBI already re-erases empty blocks
[1].

[1]http://elixir.free-electrons.com/linux/latest/source/drivers/mtd/ubi/attach.c#L983