linux-ext4 - Re: [PATCH 1/2] ext4: avoid hangs in ext4_da_should_update_i

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Date:	Mon, 12 Dec 2011 17:57:59 +0100
From:	Andrea Arcangeli <aarcange@...hat.com>
To:	Yongqiang Yang <xiaoqiangnk@...il.com>
Cc:	linux-ext4@...r.kernel.org, Theodore Tso <tytso@....edu>,
	Jan Kara <jack@...e.cz>
Subject: Re: [PATCH 1/2] ext4: avoid hangs in
 ext4_da_should_update_i_disksize()

On Mon, Dec 12, 2011 at 11:28:21AM +0800, Yongqiang Yang wrote:
> Hi Andrea,
> 
> I can not figure out why ext4 hangs.  Could you explain more on hanging?

Well I tried to explain it in the changeset comment.

If "copied" is zero, end/offset/idx becomes -1, and this loops:

	for (i = 0; i < idx; i++)

definitely a bug and checking ext4 git I don't see anything fixing it.
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