linux-kernel - Re: [PATCH] fs/ext4: add missing ext4_resize

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Message-ID: <20120103104749.GA18875@dztty>
Date:	Tue, 3 Jan 2012 11:47:49 +0100
From:	Djalal Harouni <tixxdz@...ndz.org>
To:	Yongqiang Yang <xiaoqiangnk@...il.com>
Cc:	Theodore Ts'o <tytso@....edu>,
	Andreas Dilger <adilger.kernel@...ger.ca>,
	linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH] fs/ext4: add missing ext4_resize_end

On Fri, Dec 23, 2011 at 09:14:20AM +0800, Yongqiang Yang wrote:
> Thanks.
> 
> The patch looks good.   I have to update the new resize patch too.
> 
> Yongqiang.
> 
> On Thu, Dec 22, 2011 at 11:00 PM, Djalal Harouni <tixxdz@...ndz.org> wrote:
> > Online resize ioctls 'EXT4_IOC_GROUP_EXTEND' and 'EXT4_IOC_GROUP_ADD'
> > call ext4_resize_begin() to check permissions and to set the
> > EXT4_RESIZING bit lock, they do their work and they must finish with
> > ext4_resize_end() which calls clear_bit_unlock() to unlock and to
> > avoid -EBUSY errors for the next resize operations.
> >
> > This patch adds the missing ext4_resize_end() calls on error paths.
Any news on this one ?

If we call EXT4_IOC_GROUP_EXTEND ioctl and get_user() fails with -EFAULT
then any new call will return -EBUSY, unless we unmount/mount the fs.

In rare situations this can lead to a corrupt filesystem, I've experienced
this, but I'm not sure what I did. fsck fix it.

Thanks.

-- 
tixxdz
http://opendz.org
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