X-Git-Url: http://review.tizen.org/git/?a=blobdiff_plain;f=root-tree.c;h=6b8f8c1ce6c5cee3a810b4bc765ecfd30c67cfba;hb=acd4df738165e1e4b16e199ee70b77d3e64a260a;hp=858fe2f50b4da4ad1d3dceb272f19b2904951b3b;hpb=b91d84abc0df2195aaa06a79b565d8852b3099b2;p=platform%2Fupstream%2Fbtrfs-progs.git

diff --git a/root-tree.c b/root-tree.c
index 858fe2f..6b8f8c1 100644
--- a/root-tree.c
+++ b/root-tree.c
@@ -31,23 +31,28 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
 	int ret;
 	int slot;
 
+	path = btrfs_alloc_path();
+	if (!path)
+		return -ENOMEM;
+
 	search_key.objectid = objectid;
 	search_key.type = BTRFS_ROOT_ITEM_KEY;
 	search_key.offset = (u64)-1;
 
-	path = btrfs_alloc_path();
-	BUG_ON(!path);
 	ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0);
 	if (ret < 0)
 		goto out;
-	if (path->slots[0] == 0)
-		return -ENOENT;
+	if (path->slots[0] == 0) {
+		ret = -ENOENT;
+		goto out;
+	}
 
 	BUG_ON(ret == 0);
 	l = path->nodes[0];
 	slot = path->slots[0] - 1;
 	btrfs_item_key_to_cpu(l, &found_key, slot);
-	if (found_key.objectid != objectid) {
+	if (found_key.type != BTRFS_ROOT_ITEM_KEY ||
+	    found_key.objectid != objectid) {
 		ret = -ENOENT;
 		goto out;
 	}
@@ -56,7 +61,6 @@ int btrfs_find_last_root(struct btrfs_root *root, u64 objectid,
 	memcpy(key, &found_key, sizeof(found_key));
 	ret = 0;
 out:
-	btrfs_release_path(path);
 	btrfs_free_path(path);
 	return ret;
 }
@@ -73,7 +77,9 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
 	u32 old_len;
 
 	path = btrfs_alloc_path();
-	BUG_ON(!path);
+	if (!path)
+		return -ENOMEM;
+
 	ret = btrfs_search_slot(trans, root, key, path, 0, 1);
 	if (ret < 0)
 		goto out;
@@ -120,7 +126,6 @@ int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
 	write_extent_buffer(l, item, ptr, sizeof(*item));
 	btrfs_mark_buffer_dirty(path->nodes[0]);
 out:
-	btrfs_release_path(path);
 	btrfs_free_path(path);
 	return ret;
 }
@@ -139,6 +144,31 @@ int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root
 	return ret;
 }
 
+/* drop the root item for 'key' from 'root' */
+int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
+		   struct btrfs_key *key)
+{
+	struct btrfs_path *path;
+	int ret;
+
+	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 != 0) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	ret = btrfs_del_item(trans, root, path);
+out:
+	btrfs_free_path(path);
+	return ret;
+}
+
 /*
  * add a btrfs_root_ref item.  type is either BTRFS_ROOT_REF_KEY
  * or BTRFS_ROOT_BACKREF_KEY.