From: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Date: Fri, 6 Feb 2015 16:06:25 +0000 (-0500)
Subject: btrfs: qgroup: fix limit args override whole limit struct
X-Git-Tag: v4.1-rc1~30^2~14
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=03477d945f13a284d35a757b2c2323d165d5cd81;p=karo-tx-linux.git

btrfs: qgroup: fix limit args override whole limit struct

btrfs_limit_group use arg limit to override the old qgroup_limit of
corresponding qgroup. However, we should override part of old qgroup_limit
according to the bit which has been set in arg limit.

Signed-off-by: Fan Chengniang <fancn.fnst@cn.fujitsu.com>
Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/qgroup.c b/fs/btrfs/qgroup.c
index 5d1d75611745..5c2aaccbe3da 100644
--- a/fs/btrfs/qgroup.c
+++ b/fs/btrfs/qgroup.c
@@ -1185,11 +1185,16 @@ int btrfs_limit_qgroup(struct btrfs_trans_handle *trans,
 	}
 
 	spin_lock(&fs_info->qgroup_lock);
-	qgroup->lim_flags = limit->flags;
-	qgroup->max_rfer = limit->max_rfer;
-	qgroup->max_excl = limit->max_excl;
-	qgroup->rsv_rfer = limit->rsv_rfer;
-	qgroup->rsv_excl = limit->rsv_excl;
+	if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER)
+		qgroup->max_rfer = limit->max_rfer;
+	if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL)
+		qgroup->max_excl = limit->max_excl;
+	if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER)
+		qgroup->rsv_rfer = limit->rsv_rfer;
+	if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL)
+		qgroup->rsv_excl = limit->rsv_excl;
+	qgroup->lim_flags |= limit->flags;
+
 	spin_unlock(&fs_info->qgroup_lock);
 
 	ret = update_qgroup_limit_item(trans, quota_root, qgroup);