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

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Date:	Fri, 11 Sep 2009 20:24:57 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Daniel Walker <dwalker@...o99.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>,
	Douglas Gilbert <dgilbert@...erlog.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Hannes Reinecke <hare@...e.de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Joel Becker <joel.becker@...cle.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Christoph Hellwig <hch@....de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Florian Haas <florian.haas@...bit.com>,
	Philipp Reisner <philipp.reisner@...bit.com>
Subject: Re: [RFC PATCH 0/19] A kernel-level configfs enabled generic
	target engine for Linux v2.6.32

On Fri, 2009-09-11 at 20:17 -0700, Daniel Walker wrote:
> On Fri, 2009-09-11 at 20:08 -0700, Nicholas A. Bellinger wrote:
> 
> 
> > 
> > Ok, I will have a look at converting the HBA semaphore to a mutex in
> > patch 5, and use some single use waitqueues in patch 16.  Btw, the ones
> > using init_MUTEX_LOCKED() in the latter source file are being used when
> > shutting down target_core_mod allocated kernel threads to sychronize
> > between the stopping processing threads and configfs process context
> > that waitqueues would work better for.  Thanks for pointing this out!
> 
> You could also use completions in patch 16 if the waitqueues turn out to
> be not what your looking for. Completion can sometimes be a find&replace
> substitute for the locked semaphores.

Sorry, include/linux/complete.h is what I was thinking here too..

> 
> 
> > I was thinking about going through the typedefs with a sed chainsaw, but
> > I decided against for this TCM patch series because it makes keeping
> > backward ports to <= v2.6.31 slightly easier to maintain for me for the
> > current users of LIO kernel code.
> > 
> > However, I have been starting to not use typedef for the newest ALUA and
> > pieces of PR code, and I would be happy to have another look at typedef
> > style comments on this once the other larger interest items are on the
> > way to being resolved.
> 
> It's up to you, but you should schedule the typedefs for removal at some
> point.
> 

Ok, I will do that.

Many thanks for your most valuable of time,

--nab

> Daniel
> 

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