From 78aaced3408141bb7c836f2db0ca435790399da5 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Sat, 26 Feb 2011 14:09:14 -0500
Subject: [PATCH] ext4: don't lock the next page in write_cache_pages if not
 needed

If we have accumulated a contiguous region of memory to be written
out, and the next page can added to this region, don't bother locking
(and then unlocking the page) before writing out the memory.  In the
unlikely event that the next page was being written back by some other
CPU, we can also skip waiting that page to finish writeback.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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