linux-kernel - Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20080521193633.GA26780@shareable.org>
Date:	Wed, 21 May 2008 20:36:33 +0100
From:	Jamie Lokier <jamie@...reable.org>
To:	Theodore Tso <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pavel Machek <pavel@...e.cz>,
	Chris Mason <chris.mason@...cle.com>,
	Eric Sandeen <sandeen@...hat.com>,
	Andi Kleen <andi@...stfloor.org>, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 0/4] (RESEND) ext3[34] barrier changes

Theodore Tso wrote:
> On Wed, May 21, 2008 at 11:03:24AM -0700, Andrew Morton wrote:
> > 
> > afaik there is no need to enable this feature if the machine (actually
> > the disks) are on a UPS, yes?
> 
> Yes, as long as you're confident that there won't be a kernel
> bug/regression causing a lockup while the server is under severe
> memory pressure while doing lots of fsync's, file creations, renames,
> etc.  And as long as your 100% confident that UPS's will never fail,
> janitors will never accidentally hit the Emergency Power Office

Can a kernel lockup cause this kind of corruption?

Will a system reboot wipe the disk's write cache?

I had imagined only power loss would prevent the disk from
writing it's cache eventually; is that wrong?

-- Jamie

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/