linux-kernel - Re: Re: EXT4 panic at jbd2_journal_put_journal

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Message-id: <3567921.21651368421937829.JavaMail.weblogic@epml07>
Date:	Mon, 13 May 2013 05:12:20 +0000 (GMT)
From:	EUNBONG SONG <eunb.song@...sung.com>
To:	"Sidorov, Andrei" <Andrei.Sidorov@...isi.com>,
	Theodore Ts'o <tytso@....edu>, Tony Luck <tony.luck@...il.com>,
	Dmitry Monakhov <dmonakhov@...nvz.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Re: EXT4 panic at jbd2_journal_put_journal_head() in 3.9+


> Hi,

> Bitfields are likely to be implemented using read-modify-write semantics.
> Modifications of either b_jlist or b_jmodified must be done under lock
> since they share same uint. I guess this lock is missing somewhere.

Hi, I agree with you.  b_jlist and b_jmodified share the same unit.
I think they are separated. 
Thanks.