[PATCH] Btrfs: fix double decrease of the writer counter

[Miao Xie <miaox@cn.fujitsu.com>]

In __btrfs_end_transaction(), we have invoked sb_end_intwrite(), but if we
need run btrfs_commit_transaction(), we will decrease the writer counter
for two times because btrfs_commit_transaction() also invokes sb_end_intwrite().
Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
---
 fs/btrfs/transaction.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/btrfs/transaction.c b/fs/btrfs/transaction.c
index 27c2600..3134fdc 100644
--- a/fs/btrfs/transaction.c
+++ b/fs/btrfs/transaction.c
@@ -551,8 +551,6 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
 	btrfs_trans_release_metadata(trans, root);
 	trans->block_rsv = NULL;
 
-	sb_end_intwrite(root->fs_info->sb);
-
 	if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) &&
 	    should_end_transaction(trans, root)) {
 		trans->transaction->blocked = 1;
@@ -573,6 +571,8 @@ static int __btrfs_end_transaction(struct btrfs_trans_handle *trans,
 		}
 	}
 
+	sb_end_intwrite(root->fs_info->sb);
+
 	WARN_ON(cur_trans != info->running_transaction);
 	WARN_ON(atomic_read(&cur_trans->num_writers) < 1);
 	atomic_dec(&cur_trans->num_writers);
-- 
1.7.6.5