linux-ext4

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Date:	Tue,  3 May 2011 16:08:36 +0300
From:	Surbhi Palande <surbhi.palande@...onical.com>
To:	jack@...e.cz
Cc:	toshi.okajima@...fujitsu.com, tytso@....edu,
	m.mizuma@...fujitsu.com, adilger.kernel@...ger.ca,
	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	sandeen@...hat.com
Subject: 

On munmap() zap_pte_range() is called which dirties the PTE dirty pages as
Toshiyuki pointed out.

zap_pte_range()
  mapping->a_ops->set_page_dirty (= ext4_journalled_set_page_dirty)  

So, I think that it is here that we should do the checking for a ext4 F.S
frozen state and also prevent a parallel ext4 F.S freeze from happening.

Attaching a patch for initial review. Please do let me know your thoughts! 

Thanks a lot!

Warm Regards,
Surbhi.

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