Btrfs: Add flush barriers on commit

Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e0940a39ff07..a481b970608c 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -762,10 +762,15 @@ int write_ctree_super(struct btrfs_trans_handle *trans, struct btrfs_root
         int ret;
         struct extent_buffer *super = root->fs_info->sb_buffer;
         struct inode *btree_inode = root->fs_info->btree_inode;
+        struct super_block *sb = root->fs_info->sb;
 
+        if (!btrfs_test_opt(root, NOBARRIER))
+                blkdev_issue_flush(sb->s_bdev, NULL);
         set_extent_buffer_dirty(&BTRFS_I(btree_inode)->extent_tree, super);
         ret = sync_page_range_nolock(btree_inode, btree_inode->i_mapping,
                                      super->start, super->len);
+        if (!btrfs_test_opt(root, NOBARRIER))
+                blkdev_issue_flush(sb->s_bdev, NULL);
         return ret;
 }