linux-kernel - Re: [patch for-3.6] fs, debugfs: fix race in u32_array

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Date:	Mon, 24 Sep 2012 15:26:36 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
cc:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Konrad Rzeszutek Wilk <konrad@...nel.org>,
	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Suzuki Poulose <suzuki@...ibm.com>
Subject: Re: [patch for-3.6] fs, debugfs: fix race in u32_array_read and
 allocate array at open

On Fri, 21 Sep 2012, Raghavendra K T wrote:

> I think you meant we can read data only once. second time onwards we don't see
> any data. (except when fd is forked by child/ races in
> threads).
> 

You can read(2) as many times as you want after it's opened and will get 
persistent data.
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