linux-kernel - Re: [PATCH] block layer: elv_iosched_show should get elv_list

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Message-ID: <20061011112314.GP6515@kernel.dk>
Date:	Wed, 11 Oct 2006 13:23:14 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Vasily Tarasov <vtaras@...nvz.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	OpenVZ Developer List <devel@...nvz.org>
Subject: Re: [PATCH] block layer: elv_iosched_show should get elv_list_lock

On Wed, Oct 11 2006, Vasily Tarasov wrote:
> elv_iosched_show function iterates other elv_list,
> hence elv_list_lock should be got.

Indeed, that's a bug. Thanks!

> Also the question is: in elv_iosched_show, elv_iosched_store
> q->elevator->elevator_type construction is used without locking
> q->queue_lock.  Is it expected?..

As long as the queue doesn't go away, we should be safe enough.

-- 
Jens Axboe

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