linux-kernel - Re: [PATCH 0/17]: New SCSI target framework (SCST) with dev handlers and 2 target drivers

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Message-ID: <4C910B70.8060305@vlnb.net>
Date:	Wed, 15 Sep 2010 22:07:44 +0400
From:	Vladislav Bolkhovitin <vst@...b.net>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
CC:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
	scst-devel <scst-devel@...ts.sourceforge.net>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Jeff Garzik <jeff@...zik.org>, Vu Pham <vuhuong@...lanox.com>,
	Bart Van Assche <bart.vanassche@...il.com>,
	James Smart <James.Smart@...lex.Com>,
	Joe Eykholt <jeykholt@...co.com>, Andy Yan <ayan@...vell.com>,
	Chetan Loke <generationgnu@...oo.com>,
	Hannes Reinecke <hare@...e.de>,
	Richard Sharpe <realrichardsharpe@...il.com>
Subject: Re: [PATCH 0/17]: New SCSI target framework (SCST) with dev handlers
 and 2 target drivers

Vladislav Bolkhovitin, on 09/15/2010 06:52 PM wrote:
> It, definitely,
> isn't a piece of beauty, but it's simple and works, so, I believe, good enough. User space,
> anyway, is supposes to hide all the complexities of the direct SYSFS manipulations under
> higher level management tools like scstadmin.

There's one more point I forgot to note why having the separate SYSFS
management thread is good: it naturally serializes all SYSFS management
operations, so allows to simplify locking in target drivers and dev
handlers. For instance, it allows in add_target() callback don't bother
if del_target() or another add_target() for the same target name called
simultaneously.

Thanks,
Vlad
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