linux-ext4 - Re: RT/ext4/jbd2 circular dependency

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Message-ID: <20141030122417.GB5032@thunk.org>
Date:	Thu, 30 Oct 2014 08:24:17 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Kevin Liao <kevinlia@...il.com>
Cc:	Chris Friesen <chris.friesen@...driver.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Austin Schuh <austin@...oton-tech.com>, pavel@...linux.ru,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	adilger.kernel@...ger.ca, rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: RT/ext4/jbd2 circular dependency

On Thu, Oct 30, 2014 at 04:15:45PM +0800, Kevin Liao wrote:
> 
> I also have similar jbd2 hang problem for kernel 3.4. Could you kindly
> specify what are the three commits to fix the issue? Cause I can not
> find them using the keyword "commit b34090e e5a120a f5113ef".

Those *are* the three commits:

% git log -3 --oneline  b34090e 
b34090e jbd2: refine waiting for shadow buffers
e5a120a jbd2: remove journal_head from descriptor buffers
f5113ef jbd2: don't create journal_head for temporary journal buffers

Or if you need the full git commit ID's

% git log --pretty=oneline -3  b34090e 
b34090e5e22a02fba0e4473056cce9420ad9dd0b jbd2: refine waiting for shadow buffers
e5a120aeb57f40ae568a5ca1dd6ace53d0213582 jbd2: remove journal_head from descriptor buffers
f5113effc2a2ee6b86a4b345ce557353dcbcfffe jbd2: don't create journal_head for temporary journal buffers

Or the URL's:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b34090e5e22a02fba0e4473056cce9420ad9dd0b
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e5a120aeb57f40ae568a5ca1dd6ace53d0213582
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=f5113effc2a2ee6b86a4b345ce557353dcbcfffe

Cheers,

						- Ted
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