Linux Kernel  3.7.1
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failslab.c
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1 #include <linux/fault-inject.h>
2 #include <linux/slab.h>
3 
4 static struct {
5  struct fault_attr attr;
8 } failslab = {
9  .attr = FAULT_ATTR_INITIALIZER,
10  .ignore_gfp_wait = 1,
11  .cache_filter = 0,
12 };
13 
14 bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags)
15 {
16  if (gfpflags & __GFP_NOFAIL)
17  return false;
18 
19  if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT))
20  return false;
21 
22  if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB))
23  return false;
24 
25  return should_fail(&failslab.attr, size);
26 }
27 
28 static int __init setup_failslab(char *str)
29 {
30  return setup_fault_attr(&failslab.attr, str);
31 }
32 __setup("failslab=", setup_failslab);
33 
34 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
35 static int __init failslab_debugfs_init(void)
36 {
37  struct dentry *dir;
39 
40  dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
41  if (IS_ERR(dir))
42  return PTR_ERR(dir);
43 
44  if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
45  &failslab.ignore_gfp_wait))
46  goto fail;
47  if (!debugfs_create_bool("cache-filter", mode, dir,
48  &failslab.cache_filter))
49  goto fail;
50 
51  return 0;
52 fail:
54 
55  return -ENOMEM;
56 }
57 
58 late_initcall(failslab_debugfs_init);
59 
60 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */