Btrfs: Create orphan inode records to prevent lost files after a crash

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

1 files changed, 67 insertions, 0 deletions

diff --git a/fs/btrfs/orphan.c b/fs/btrfs/orphan.c
new file mode 100644
index 000000000000..3c0d52af4f80
--- /dev/null
+++ b/fs/btrfs/orphan.c
@@ -0,0 +1,67 @@
+/*
+ * 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)
+                goto out;
+
+        ret = btrfs_del_item(trans, root, path);
+
+out:
+        btrfs_free_path(path);
+        return ret;
+}