Btrfs: fix the qgroup reserved space is released prematurely

In start_transactio(), we will try to join the transaction again after
the current transaction is committed, so we should not release the
reserved space of the qgroup. Fix it.

Cc: Arne Jansen <sensille@gmx.net>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 0c87d18d1881..425d5b57d377 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -383,7 +383,7 @@ again:
         h->block_rsv = NULL;
         h->orig_rsv = NULL;
         h->aborted = 0;
-        h->qgroup_reserved = qgroup_reserved;
+        h->qgroup_reserved = 0;
         h->delayed_ref_elem.seq = 0;
         h->type = type;
         h->allocating_chunk = false;
@@ -402,6 +402,7 @@ again:
                 h->block_rsv = &root->fs_info->trans_block_rsv;
                 h->bytes_reserved = num_bytes;
         }
+        h->qgroup_reserved = qgroup_reserved;
 
 got_it:
         btrfs_record_root_in_trans(h, root);