From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Mon, 26 Oct 2015 06:11:19 +0000 (+0800)
Subject: btrfs: qgroup: Fix a rebase bug which will cause qgroup double free
X-Git-Tag: v4.14-rc1~4163^2~36
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=90ce321da8ce3d00e19586993887346286208386;p=platform%2Fkernel%2Flinux-rpi.git

btrfs: qgroup: Fix a rebase bug which will cause qgroup double free

When rebasing my patchset, I forgot to pick up a cleanup patch to remove
old hotfix in 4.2 release.

Witouth the cleanup, it will screw up new qgroup reserve framework and
always cause minus reserved number.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 31d1934..46476c2 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1652,10 +1652,6 @@ static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
 			}
 		}
 
-		/* For exclusive extent, free its reserved bytes too */
-		if (nr_old_roots == 0 && nr_new_roots == 1 &&
-		    cur_new_count == nr_new_roots)
-			qg->reserved -= num_bytes;
 		if (dirty)
 			qgroup_dirty(fs_info, qg);
 	}