linux-kernel - Re: ext2 + -osync: not as easy as it seems

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]

Date:	Wed, 14 Jan 2009 09:34:55 -0500
From:	Theodore Tso <tytso@....EDU>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Jan Kara <jack@...e.cz>,
	Fernando Luis Vázquez Cao 
	<fernando@....ntt.co.jp>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Pavel Machek <pavel@...e.cz>,
	kernel list <linux-kernel@...r.kernel.org>, sandeen@...hat.com
Subject: Re: ext2 + -osync: not as easy as it seems

On Wed, Jan 14, 2009 at 03:08:04PM +0100, Jens Axboe wrote:
> 
> It also guarentees that when you get a completion for that barrier
> write, it's on safe storage. Think of it as a flush-write-flush
> operation, in the presence of write back caching.
> 

Is that true even if the barrier isn't attached to a write operation,
i.e., when using

      blkdev_issue_flush(sb, NULL);

?

					- Ted
--
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/