## gdb helper commands and functions for Linux kernel debugging##  VFS tools## Copyright (c) 2023 Glenn Washburn# Copyright (c) 2016 Linaro Ltd## Authors:#  Glenn Washburn <development@efficientek.com>#  Kieran Bingham <kieran.bingham@linaro.org>## This work is licensed under the terms of the GNU GPL version 2.# import gdbfrom linux import utils  def dentry_name(d):    parent = d['d_parent']    if parent == d or parent == 0:        return ""    p = dentry_name(d['d_parent']) + "/"    return p + d['d_iname'].string() class DentryName(gdb.Function):    """Return string of the full path of a dentry. $lx_dentry_name(PTR): Given PTR to a dentry struct, return a stringof the full path of the dentry."""     def __init__(self):        super(DentryName, self).__init__("lx_dentry_name")     def invoke(self, dentry_ptr):        return dentry_name(dentry_ptr) DentryName()  dentry_type = utils.CachedType("struct dentry") class InodeDentry(gdb.Function):    """Return dentry pointer for inode. $lx_i_dentry(PTR): Given PTR to an inode struct, return a pointer tothe associated dentry struct, if there is one."""     def __init__(self):        super(InodeDentry, self).__init__("lx_i_dentry")     def invoke(self, inode_ptr):        d_u = inode_ptr["i_dentry"]["first"]        if d_u == 0:            return ""        return utils.container_of(d_u, dentry_type.get_type().pointer(), "d_u") InodeDentry()