linux-ext4 - Factor common code from convert and split-unwritten.

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Date:	Mon,  2 May 2011 19:04:58 -0700
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	linux-ext4@...r.kernel.org
Cc:	tytso@....edu, achender@...ux.vnet.ibm.com, cmm@...ibm.com
Subject: Factor common code from convert and split-unwritten. 

v1->v2:
   Remove optimization in v1.

v0->v1:
   Fix a bug in ext4_ext_convert_to_initialized() reported by
   Allison Henderson <achender@...ux.vnet.ibm.com>

   optimize ext4_ext_convert_to_initialized().

The patch series factor common code from ext4_ext_convert_to_initialized()
and ext4_split_unwritten_extents() so that extent-move-on-write in snapshot
and punch-hole can be built on the common code.

[PATCH v2 1/3] ext4:Add a function merging extent right and left.
[PATCH v2 2/3] ext4:Add two functions splitting an extent.
[PATCH v2 3/3] ext4:Reimplement convert and split_unwritten.
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