From 308d9800b2c4f1fb344dbf055912d3140438bac0 Mon Sep 17 00:00:00 2001
From: Filipe Manana <fdmanana@gmail.com>
Date: Tue, 11 Mar 2014 13:56:15 +0000
Subject: [PATCH] Btrfs: cache extent states in defrag code path

When locking file ranges in the inode's io_tree, cache the first
extent state that belongs to the target range, so that when unlocking
the range we don't need to search in the io_tree again, reducing cpu
time and making and therefore holding the io_tree's lock for a shorter
period.

Signed-off-by: Filipe David Borba Manana <fdmanana@gmail.com>
Signed-off-by: Chris Mason <clm@fb.com>
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