linux-kernel - RE: [RFC PATCH 0/19] A kernel-level configfs enabled generic target engine for Linux v2.6.32

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Message-ID: <412A05BA40734D4887DBC67661F4330810060F29@EXMAIL.ad.emulex.com>
Date:	Mon, 14 Sep 2009 13:12:25 -0700
From:	Chetan.Loke@...lex.Com
To:	<nab@...ux-iscsi.org>, <linux-kernel@...r.kernel.org>,
	<linux-scsi@...r.kernel.org>
CC:	<akpm@...ux-foundation.org>, <greg@...ah.com>,
	<dgilbert@...erlog.com>, <James.Bottomley@...senPartnership.com>,
	<hare@...e.de>, <fujita.tomonori@....ntt.co.jp>,
	<michaelc@...wisc.edu>, <joel.becker@...cle.com>,
	<martin.petersen@...cle.com>, <hch@....de>,
	<torvalds@...ux-foundation.org>, <stern@...land.harvard.edu>,
	<bharrosh@...asas.com>, <florian.haas@...bit.com>,
	<philipp.reisner@...bit.com>
Subject: RE: [RFC PATCH 0/19] A kernel-level configfs enabled generic target
	engine for Linux v2.6.32

> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> owner@...r.kernel.org] On Behalf Of Nicholas A. Bellinger
> Sent: Friday, September 11, 2009 9:55 PM
> To: LKML; linux-scsi
> Cc: Andrew Morton; Greg KH; Douglas Gilbert; James Bottomley; Hannes
> Reinecke; FUJITA Tomonori; Mike Christie; Joel Becker; Martin K. Petersen;
> Christoph Hellwig; Linus Torvalds; Alan Stern; Boaz Harrosh; Florian Haas;
> Philipp Reisner
> Subject: [RFC PATCH 0/19] A kernel-level configfs enabled generic target
> engine for Linux v2.6.32
> 
> Greetings all,
> 
> This is my humble request for review and inclusion of
> Target_Core_Mod/ConfigFS v3.2 from lio-core-2.6.git code into mainline
> v2.6.32.  With TCM v3.2, the two major SPC-4 SCSI target mode fabric
> features that have now been completed: Persistent Reservation APTPL and
> implict/explict ALUA are the first all optional SPC4 defined feature
> implementation of PR and ALUA in the Linux OSS target theatre using an
> upstream user-driven virtual filesystem directory hierarchy structure
> based on configfs that can be configured in realtime in combination with
> interpreted userspace code.
> 
> Both of these new features are now being used to provide Persistent
> Reservations
> across target power loss and asymmetric multipath I/O to both Linux and
> non-Linux
> clients.  There is also an optional ALUA transition delay logic that has
> been
> included to futher debug and improve existing upstream client side Linux
> kernel code
> using TCM v3.2. These patches have been diffed against v2.6.31, and tested
> on x86
> 32-bit HVM, x86_64 KVM, and powerpc.
> 
> There is cleanup work continuing to make the TCM code to use dprintk(),
> and some include cleanups, and other minor fixes.  The code has also
> been run through checkpatch again since the posting in April, and all
> errors have been removed, with the exception of one ConfigFS macro
> define triggering a checkpatch false positive.
> 
> As with the posting of the TCM v3.0 code earlier in April, I have
> decided to break up the submissions into the generic target_core_mod
> piece (this patch series) and then a seperate one that will be appearing
> in the next days for v3.2 of the LIO-Target iSCSI fabric module.
> 
> More Information about Target_Core_Mod/ConfigFS, and PR and ALUA:
> 
> http://www.linux-iscsi.org/index.php/Target_Core_Mod/ConfigFS
> http://www.linux-iscsi.org/index.php/Persistent_Reservations
> http://www.linux-iscsi.org/index.php/ALUA
> 
> The complete v3.x TCM CLI operations set can be found here:
> 
> http://www.linux-iscsi.org/index.php/Lio-utils#v3.1_TCM_CLI_operations
> 
> Instructions and examples for getting setup:
> 
> http://linux-iscsi.org/builds/docs/LIO-3.0-Users_Reference_Manual.pdf
> http://www.linux-iscsi.org/index.php/Howto#Start_target_core_mod
> 
> Constructive comments are welcome,
> 
> --nab
> 



Any pointers/URLs for the design/arch doc?


Chetan 
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