Btrfs: fix wrong sync_writers decrement in btrfs_file_aio_write()

If the checks at the beginning of btrfs_file_aio_write() fail, we needn't
decrease ->sync_writers, because we have not increased it. Fix it.

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/file.c b/fs/btrfs/file.c
index 841cfe3be0e0..a902faab7161 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1595,9 +1595,10 @@ static ssize_t btrfs_file_aio_write(struct kiocb *iocb,
                 if (err < 0 && num_written > 0)
                         num_written = err;
         }
-out:
+
         if (sync)
                 atomic_dec(&BTRFS_I(inode)->sync_writers);
+out:
         sb_end_write(inode->i_sb);
         current->backing_dev_info = NULL;
         return num_written ? num_written : err;