zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/btrfs/orphan.c b/ap/os/linux/linux-3.4.x/fs/btrfs/orphan.c
new file mode 100644
index 0000000..24cad16
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/btrfs/orphan.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2008 Red Hat. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include "ctree.h"
+#include "disk-io.h"
+
+int btrfs_insert_orphan_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 offset)
+{
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ int ret = 0;
+
+ key.objectid = BTRFS_ORPHAN_OBJECTID;
+ btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
+ key.offset = offset;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_insert_empty_item(trans, root, path, &key, 0);
+
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_del_orphan_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, u64 offset)
+{
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ int ret = 0;
+
+ key.objectid = BTRFS_ORPHAN_OBJECTID;
+ btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY);
+ key.offset = offset;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
+ if (ret < 0)
+ goto out;
+ if (ret) { /* JDM: Really? */
+ ret = -ENOENT;
+ goto out;
+ }
+
+ ret = btrfs_del_item(trans, root, path);
+
+out:
+ btrfs_free_path(path);
+ return ret;
+}
+
+int btrfs_find_orphan_item(struct btrfs_root *root, u64 offset)
+{
+ struct btrfs_path *path;
+ struct btrfs_key key;
+ int ret;
+
+ key.objectid = BTRFS_ORPHAN_OBJECTID;
+ key.type = BTRFS_ORPHAN_ITEM_KEY;
+ key.offset = offset;
+
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+
+ btrfs_free_path(path);
+ return ret;
+}