From 804ca127fb93988c6a9d5f2bf4a8f1a780c9a2d0 Mon Sep 17 00:00:00 2001
From: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Date: Fri, 12 Dec 2014 16:44:34 +0800
Subject: [PATCH] Btrfs: qgroup: free reserved in exceeding quota.

When we exceed quota limit in writing, we will free
some reserved extent when we need to drop but not free
account in qgroup. It means, each time we exceed quota
in writing, there will be some remain space in qg->reserved
we can not use any more. If things go on like this, the
all space will be ate up.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Chris Mason <clm@fb.com>
---
 fs/btrfs/extent-tree.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c
index 2713dcbc70f7..695d5110e020 100644
--- a/fs/btrfs/extent-tree.c
+++ b/fs/btrfs/extent-tree.c
@@ -5475,8 +5475,11 @@ out_fail:
 			to_free = 0;
 	}
 	spin_unlock(&BTRFS_I(inode)->lock);
-	if (dropped)
+	if (dropped) {
+		if (root->fs_info->quota_enabled)
+			btrfs_qgroup_free(root, dropped * root->nodesize);
 		to_free += btrfs_calc_trans_metadata_size(root, dropped);
+	}
 
 	if (to_free) {
 		btrfs_block_rsv_release(root, block_rsv, to_free);
-- 
2.20.1