linux-ext4 - Re: Checks in ext4_ext_fiemap

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Date:	Tue, 26 Jul 2011 13:07:01 -0400
From:	Ted Ts'o <tytso@....edu>
To:	Yongqiang Yang <xiaoqiangnk@...il.com>
Cc:	Jan Kara <jack@...e.cz>,
	Allison Henderson <achender@...ux.vnet.ibm.com>,
	linux-ext4@...r.kernel.org, Andreas Dilger <adilger@...ger.ca>
Subject: Re: Checks in ext4_ext_fiemap_cb() broken

On Tue, Jul 26, 2011 at 08:48:21PM +0800, Yongqiang Yang wrote:
> I guess there are other places where delayed extents should be handled
> by looking up page cache.
> 
> SEEK_HOLE and SEEK_DATA also need to lookup page cache to handle
> delayed extents.

Another place where we're using testing the page cache for delalloc
extents is in the bigalloc patches.  See ext4_find_delalloc_range in
Aditya's patch:

	 http://permalink.gmane.org/gmane.comp.file-systems.ext4/26619

							- Ted

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