static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
				     void *warn_ctx)
{
	u64 isize;
	u32 nlink;
	int ret;
	int i;
	unsigned nofs_flag;
	struct extent_buffer *eb;
	struct btrfs_inode_item *inode_item;
	struct scrub_warning *swarn = warn_ctx;
	struct btrfs_fs_info *fs_info = swarn->dev->fs_info;
	struct inode_fs_paths *ipath = NULL;
	struct btrfs_root *local_root;
	struct btrfs_key root_key;
	struct btrfs_key key;

	root_key.objectid = root;
	root_key.type = BTRFS_ROOT_ITEM_KEY;
	root_key.offset = (u64)-1;
	local_root = btrfs_read_fs_root_no_name(fs_info, &root_key);
	if (IS_ERR(local_root)) {
		ret = PTR_ERR(local_root);
		goto err;
	}

	/*
	 * this makes the path point to (inum INODE_ITEM ioff)
	 */
	key.objectid = inum;
	key.type = BTRFS_INODE_ITEM_KEY;
	key.offset = 0;

	ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0);
	if (ret) {
		btrfs_release_path(swarn->path);
		goto err;
	}

	eb = swarn->path->nodes[0];
	inode_item = btrfs_item_ptr(eb, swarn->path->slots[0],
					struct btrfs_inode_item);
	isize = btrfs_inode_size(eb, inode_item);
	nlink = btrfs_inode_nlink(eb, inode_item);
	btrfs_release_path(swarn->path);

	/*
	 * init_path might indirectly call vmalloc, or use GFP_KERNEL. Scrub
	 * uses GFP_NOFS in this context, so we keep it consistent but it does
	 * not seem to be strictly necessary.
	 */
	nofs_flag = memalloc_nofs_save();
	ipath = init_ipath(4096, local_root, swarn->path);
	memalloc_nofs_restore(nofs_flag);
	if (IS_ERR(ipath)) {
		ret = PTR_ERR(ipath);
		ipath = NULL;
		goto err;
	}
	ret = paths_from_inode(inum, ipath);

	if (ret < 0)
		goto err;

	/*
	 * we deliberately ignore the bit ipath might have been too small to
	 * hold all of the paths here
	 */
	for (i = 0; i < ipath->fspath->elem_cnt; ++i)
		btrfs_warn_in_rcu(fs_info,
"%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu, length %llu, links %u (path: %s)",
				  swarn->errstr, swarn->logical,
				  rcu_str_deref(swarn->dev->name),
				  swarn->physical,
				  root, inum, offset,
				  min(isize - offset, (u64)PAGE_SIZE), nlink,
				  (char *)(unsigned long)ipath->fspath->val[i]);

	free_ipath(ipath);
	return 0;

err:
	btrfs_warn_in_rcu(fs_info,
			  "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu: path resolving failed with ret=%d",
			  swarn->errstr, swarn->logical,
			  rcu_str_deref(swarn->dev->name),
			  swarn->physical,
			  root, inum, offset, ret);

	free_ipath(ipath);
	return 0;
}
static int scrub_print_warning_inode(u64 inum, u64 offset, u64 root,
				     void *warn_ctx)
{
	u64 isize;
	u32 nlink;
	int ret;
	int i;
	unsigned nofs_flag;
	struct extent_buffer *eb;
	struct btrfs_inode_item *inode_item;
	struct scrub_warning *swarn = warn_ctx;
	struct btrfs_fs_info *fs_info = swarn->dev->fs_info;
	struct inode_fs_paths *ipath = NULL;
	struct btrfs_root *local_root;
	struct btrfs_key root_key;
	struct btrfs_key key;

	root_key.objectid = root;
	root_key.type = BTRFS_ROOT_ITEM_KEY;
	root_key.offset = (u64)-1;
	local_root = btrfs_read_fs_root_no_name(fs_info, &root_key);
	if (IS_ERR(local_root)) {
		ret = PTR_ERR(local_root);
		goto err;
	}

	 
	key.objectid = inum;
	key.type = BTRFS_INODE_ITEM_KEY;
	key.offset = 0;

	ret = btrfs_search_slot(NULL, local_root, &key, swarn->path, 0, 0);
	if (ret) {
		btrfs_release_path(swarn->path);
		goto err;
	}

	eb = swarn->path->nodes[0];
	inode_item = btrfs_item_ptr(eb, swarn->path->slots[0],
					struct btrfs_inode_item);
	isize = btrfs_inode_size(eb, inode_item);
	nlink = btrfs_inode_nlink(eb, inode_item);
	btrfs_release_path(swarn->path);

	 
	nofs_flag = memalloc_nofs_save();
	ipath = init_ipath(4096, local_root, swarn->path);
	memalloc_nofs_restore(nofs_flag);
	if (IS_ERR(ipath)) {
		ret = PTR_ERR(ipath);
		ipath = NULL;
		goto err;
	}
	ret = paths_from_inode(inum, ipath);

	if (ret < 0)
		goto err;

	 
	for (i = 0; i < ipath->fspath->elem_cnt; ++i)
		btrfs_warn_in_rcu(fs_info,
"%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu, length %llu, links %u (path: %s)",
				  swarn->errstr, swarn->logical,
				  rcu_str_deref(swarn->dev->name),
				  swarn->physical,
				  root, inum, offset,
				  min(isize - offset, (u64)PAGE_SIZE), nlink,
				  (char *)(unsigned long)ipath->fspath->val[i]);

	free_ipath(ipath);
	return 0;

err:
	btrfs_warn_in_rcu(fs_info,
			  "%s at logical %llu on dev %s, physical %llu, root %llu, inode %llu, offset %llu: path resolving failed with ret=%d",
			  swarn->errstr, swarn->logical,
			  rcu_str_deref(swarn->dev->name),
			  swarn->physical,
			  root, inum, offset, ret);

	free_ipath(ipath);
	return 0;
}