linux-kernel - Re: [PATCH 5/7] blktrace: report EBUSY correctly

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Message-ID: <20090320131017.GN30407@ghostprotocols.net>
Date:	Fri, 20 Mar 2009 10:10:17 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Jens Axboe <jens.axboe@...cle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/7] blktrace: report EBUSY correctly

Em Fri, Mar 20, 2009 at 09:49:08AM +0800, Li Zefan escreveu:
> blk_trace_remove_queue() returns EINVAL if q->blk_trace == NULL,
> but blk_trace_setup_queue() doesn't return EBUSY if q->blk_trace != NULL.
> 
>  # echo 0 > sdaX/trace/enable
>  # echo 0 > sdaX/trace/enable
>  bash: echo: write error: Invalid argument
>  # echo 1 > sdaX/trace/enable
>  # echo 1 > sdaX/trace/enable
>  (should return EBUSY)
> 
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>

Thanks for all the testing, its being really appreciated,

Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>

- Arnaldo
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