[PATCH 3/3] btrfs: qgroup: Fix a rebase bug which will cause qgroup double free

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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@xxxxxxxxxxxxxx>
---
 fs/btrfs/qgroup.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 158633c..7664a63 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);
 	}
-- 
2.6.2

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