From: Miao Xie <miaox@cn.fujitsu.com>
Date: Mon, 28 Jan 2013 12:34:55 +0000 (+0000)
Subject: Btrfs: fix wrong sync_writers decrement in btrfs_file_aio_write()
X-Git-Tag: v3.8-rc7~6^2~2^2~4
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=0a3404dcff29a7589e8d6ce8c36f97c5411f85b4;p=linux.git

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>
---

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;