linux-kernel - Re: [PATCH 2/2] NBD: allow hung network I/O to be cancelled

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: <170fa0d20708241113y31d2ba95xf30c83c7c4c98cd2@mail.gmail.com>
Date:	Fri, 24 Aug 2007 14:13:27 -0400
From:	"Mike Snitzer" <snitzer@...il.com>
To:	"Paul Clements" <paul.clements@...eleye.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, david@...eaves.com,
	"Wouter Verhelst" <w@...r.be>,
	"Corey Minyard" <cminyard@...sta.com>,
	nbd-general@...ts.sourceforge.net
Subject: Re: [PATCH 2/2] NBD: allow hung network I/O to be cancelled

On 8/24/07, Paul Clements <paul.clements@...eleye.com> wrote:
> This patch allows NBD I/O to be cancelled when a network outage occurs.
> Previously, I/O would just hang, and if enough I/O was hung in nbd, the
> system (at least user-level) would completely hang until a TCP timeout
> (default, 15 minutes) occurred.
>
> The patch introduces a new ioctl NBD_SET_TIMEOUT that allows a transmit
> timeout value (in seconds) to be specified. Any network send that
> exceeds the timeout will be cancelled and the nbd connection will be
> shut down. I've tested with various timeout values and 6 seconds seems
> to be a good choice for the timeout. If the NBD_SET_TIMEOUT ioctl is not
> called, you get the old (I/O hang) behavior.

Hi Paul,

Thanks for implementing this!  Do you happen to have an associated
nbd-client patch for userspace?  If not I'd be happy to coordinate
with you and Wouter on a patch.

regards,
Mike
-
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/