linux-ext4 - Re: freeze

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Message-ID: <CAD6i1fJbfiBnTu1ttisMr96PzaTWCLAsvmTjx7OevfPcAGd7-A@mail.gmail.com>
Date:	Mon, 8 Oct 2012 13:13:34 +0530
From:	Prashant Shah <pshah.mumbai@...il.com>
To:	Eric Sandeen <sandeen@...hat.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: freeze_bdev hangs

Hi,

On Fri, Oct 5, 2012 at 11:03 PM, Eric Sandeen <sandeen@...hat.com> wrote:
> I haven't looked at your custom code, but freeze has changed a bit lately,
> and "hangs" is a very vague description
>
> -Eric

I am monitoring the file system (ext3) for block writes and on
linux-2.6.18 (centos - 5.8 64bit) there are lots of writes request per
second with inode number set to 0 even when the file system is idle
and without any work loads. Didnt see this happen on linux-3.x.

filter: sector=242983 inode=0
filter: sector=242991 inode=0
filter: sector=242999 inode=0
filter: sector=243007 inode=0
filter: sector=243015 inode=0
filter: sector=243023 inode=0
filter: sector=243031 inode=0
filter: sector=243039 inode=0

What are these request with inode number as 0 ? All the special inode
numbers start from 1.

http://lxr.linux.no/#linux+v2.6.32/include/linux/ext3_fs.h#L56

Regards.
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