From mboxrd@z Thu Jan 1 00:00:00 1970 From: Hannes Reinecke Subject: Re: [PATCH 0/2] scsi_transport_fc: LUN masking Date: Fri, 29 Jan 2016 15:57:37 +0100 Message-ID: <56AB7DE1.5070107@suse.de> References: <1447238080-109942-1-git-send-email-hare@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mx2.suse.de ([195.135.220.15]:37517 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756304AbcA2O5j (ORCPT ); Fri, 29 Jan 2016 09:57:39 -0500 In-Reply-To: <1447238080-109942-1-git-send-email-hare@suse.de> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: "Martin K. Petersen" Cc: Christoph Hellwig , Ewan Milne , linux-scsi@vger.kernel.org, James Bottomley On 11/11/2015 11:34 AM, Hannes Reinecke wrote: > Hi all, >=20 > having been subjected to the pain of trying to bootstrap a really > large machine with systemd I decided to implement LUN masking in > scsi_transport_fc. > The principle is simple: disallow the automated LUN scanning when > discovering a rport, and create udev rules which selectively > enable individual LUNs by echoing the relevant values in the 'scan' > attribute of the SCSI host. > With that I'm able to boot an arbitrary large machine without > running into any udev or systemd imposed timeout. > To _disable_ LUN masking and restoring the original behaviour > I've noticed that the 'scan' sysfs attribute is actually synchronous, > ie the calling process will be blocked until the entire LUN scan > is completed. > So I've added another module parameter 'async_user_scan' to > move the scanning onto the existing scan workqueue, and unblock > the calling process. >=20 > As usual, comments and reviews are welcome. >=20 > Hannes Reinecke (2): > scsi_transport_fc: implement 'disable_target_scan' module parameter > scsi_transport_fc: Implement 'async_user_scan' module parameter >=20 > drivers/scsi/scsi_transport_fc.c | 47 ++++++++++++++++++++++++++++++= +++++++--- > 1 file changed, 44 insertions(+), 3 deletions(-) >=20 Hmm. this seemed to have fallen through --=20 Dr. Hannes Reinecke Teamlead Storage & Networking hare@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 N=FCrnberg GF: F. Imend=F6rffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG N=FCrnberg) -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html