linux-ext4 - Re: ext4: 3.17? problems

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Message-ID: <20141001085018.GB17405@quack.suse.cz>
Date:	Wed, 1 Oct 2014 10:50:18 +0200
From:	Jan Kara <jack@...e.cz>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	Pavel Machek <pavel@....cz>, Theodore Ts'o <tytso@....edu>,
	kernel list <linux-kernel@...r.kernel.org>, jack@...e.cz,
	linux-ext4@...r.kernel.org, adilger.kernel@...ger.ca,
	Dmitry Monakhov <dmonakhov@...nvz.org>,
	linux-scsi@...r.kernel.org
Subject: Re: ext4: 3.17? problems

On Tue 30-09-14 20:18:01, Henrique de Moraes Holschuh wrote:
> On Tue, 30 Sep 2014, Pavel Machek wrote:
> > > > So I had to hard power-down the machine. That should be perfectly
> > > > safe, as ext4 has a journal, and this is plain SATA disk, right?
> > >   Yes, it should be safe.
> > 
> > Good.
> 
> ...
> 
> > Is there some phase during shutdown where journalling no longer
> > protects fs integrity?
> 
> Hmm... what kind of backing device?  Because I have Crucial/Micron M500 SSDs
> here that _always_ complain (in a SMART counter/attribute) that they have
> been subject to a sudden poweroff *when subject to a normal system
> shutdown*.
> 
> This is scaring me a great deal.  Are we doing something different for SSDs
> in the scsi-sd or libata shutdown paths?
  Nothing I'm aware of but this is more a question for SCSI guys (added to
CC).

								Honza

-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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