1 #
2 # gdb helper commands and functions for Linux kernel debugging
3 #
4 # VFS tools
5 #
6 # Copyright (c) 2023 Glenn Washburn
7 # Copyright (c) 2016 Linaro Ltd
8 #
9 # Authors:
10 # Glenn Washburn <development@efficientek.com>
11 # Kieran Bingham <kieran.bingham@linaro.org>
12 #
13 # This work is licensed under the terms of the GNU GPL version 2.
14 #
15
16 import gdb
17 from linux import utils
18
19
20 def dentry_name(d):
21 parent = d['d_parent']
22 if parent == d or parent == 0:
23 return ""
24 p = dentry_name(d['d_parent']) + "/"
25 return p + d['d_iname'].string()
26
27 class DentryName(gdb.Function):
28 """Return string of the full path of a dentry.
29
30 $lx_dentry_name(PTR): Given PTR to a dentry struct, return a string
31 of the full path of the dentry."""
32
33 def __init__(self):
34 super(DentryName, self).__init__("lx_dentry_name")
35
36 def invoke(self, dentry_ptr):
37 return dentry_name(dentry_ptr)
38
39 DentryName()
40
41
42 dentry_type = utils.CachedType("struct dentry")
43
44 class InodeDentry(gdb.Function):
45 """Return dentry pointer for inode.
46
47 $lx_i_dentry(PTR): Given PTR to an inode struct, return a pointer to
48 the associated dentry struct, if there is one."""
49
50 def __init__(self):
51 super(InodeDentry, self).__init__("lx_i_dentry")
52
53 def invoke(self, inode_ptr):
54 d_u = inode_ptr["i_dentry"]["first"]
55 if d_u == 0:
56 return ""
57 return utils.container_of(d_u, dentry_type.get_type().pointer(), "d_u")
58
59 InodeDentry()
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