From 0efa9f48c7e6c15e75946dd2b1c82d3d19e13545 Mon Sep 17 00:00:00 2001
From: Mark Fasheh <mfasheh@suse.de>
Date: Tue, 30 Jun 2015 14:42:07 -0700
Subject: [PATCH] btrfs: allow dedupe of same inode
Patch-mainline: v4.2
Git-commit: 0efa9f48c7e6c15e75946dd2b1c82d3d19e13545
References: SLE12-SP1 commit d5b3732e107

clone() supports cloning within an inode so extent-same can do
the same now. This patch fixes up the locking in extent-same to
know about the single-inode case. In addition to that, we add a
check for overlapping ranges, which clone does not allow.

Signed-off-by: Mark Fasheh <mfasheh@suse.de>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
---
 fs/btrfs/ioctl.c |   78
+++++++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 61 insertions(+), 17 deletions(-)