linux-ext4 - Re: [ext4:dev 47/50] fs/ext4/indirect.c:1799 ext4_ind_punch_hole() warn: inconsistent returns mutex:&inode->i

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Date:	Fri, 28 Sep 2012 22:23:20 +0800
From:	Zheng Liu <gnehzuil.liu@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Fengguang Wu <fengguang.wu@...el.com>,
	Zheng Liu <wenqing.lz@...bao.com>,
	kernel-janitors@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [ext4:dev 47/50] fs/ext4/indirect.c:1799 ext4_ind_punch_hole()
 warn: inconsistent returns mutex:&inode->i_mutex: locked (1710) unlocked
 (1799)

On Fri, Sep 28, 2012 at 09:20:55AM -0400, Theodore Ts'o wrote:
> On Fri, Sep 28, 2012 at 02:07:19PM +0800, Fengguang Wu wrote:
> > Hi Zheng,
> > 
> > FYI, there are new smatch warnings show up in
> > 
> > tree:   git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4.git dev
> > head:   b2f1a8e5612e2488a3995ec06b422b44651d088b
> > commit: 3e1b02687146ddefa8e53c2a5e13d3bd87b16b09 [47/50] ext4: add support for hole punching non-extent-mapped files
> 
> I'm going to be dropping the indirect punch hole patches from the ext4
> dev tree, based on the number of xfstests failures that I found in my
> overnight testing.
> 
> I had hoped the changes were small and localized, and wouldn't cause
> problems if the punch hole feature wasn't used, but at this point,
> given that many distributions are starting to use the ext4 file system
> for legacy ext3 file systems, my judgement is that the risks are too
> great for the upcoming merge window; so this will probably need to
> wait for the next development cycle.

Hi Ted,

These patches would need to do more tests, and I will look at them in
next development cycle.  I am not sure whether indirect punch hole is
really useful for us or not.  What do you think about this feature?
Thanks

Regards,
Zheng
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