Btrfs: Disable tree defrag in SSD mode

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

fs/btrfs/extent-tree.c

@@ -1835,7 +1835,8 @@ struct extent_buffer *__btrfs_alloc_free_block(struct btrfs_trans_handle *trans,
 			buf->start, buf->start + buf->len - 1,
 			EXTENT_CSUM, GFP_NOFS);
 	buf->flags |= EXTENT_CSUM;
-	btrfs_set_buffer_defrag(buf);
+	if (!btrfs_test_opt(root, SSD))
+		btrfs_set_buffer_defrag(buf);
 	trans->blocks_used++;
 	return buf;
 }

fs/btrfs/tree-defrag.c

@@ -179,6 +179,9 @@ int btrfs_defrag_leaves(struct btrfs_trans_handle *trans,
 	if (root->ref_cows == 0 && !is_extent)
 		goto out;
 
+	if (btrfs_test_opt(root, SSD))
+		goto out;
+
 	path = btrfs_alloc_path();
 	if (!path)
 		return -ENOMEM;