1 #include <linux/fault-inject.h>
2
3 static struct {
4 struct fault_attr attr;
5 u32 ignore_gfp_wait;
6 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
7 struct dentry *ignore_gfp_wait_file;
8 #endif
9 } failslab = {
10 .attr = FAULT_ATTR_INITIALIZER,
11 .ignore_gfp_wait = 1,
12 };
13
should_failslab(size_t size,gfp_t gfpflags)14 bool should_failslab(size_t size, gfp_t gfpflags)
15 {
16 if (gfpflags & __GFP_NOFAIL)
17 return false;
18
19 if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT))
20 return false;
21
22 return should_fail(&failslab.attr, size);
23 }
24
setup_failslab(char * str)25 static int __init setup_failslab(char *str)
26 {
27 return setup_fault_attr(&failslab.attr, str);
28 }
29 __setup("failslab=", setup_failslab);
30
31 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
32
failslab_debugfs_init(void)33 static int __init failslab_debugfs_init(void)
34 {
35 mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
36 struct dentry *dir;
37 int err;
38
39 err = init_fault_attr_dentries(&failslab.attr, "failslab");
40 if (err)
41 return err;
42 dir = failslab.attr.dentries.dir;
43
44 failslab.ignore_gfp_wait_file =
45 debugfs_create_bool("ignore-gfp-wait", mode, dir,
46 &failslab.ignore_gfp_wait);
47
48 if (!failslab.ignore_gfp_wait_file) {
49 err = -ENOMEM;
50 debugfs_remove(failslab.ignore_gfp_wait_file);
51 cleanup_fault_attr_dentries(&failslab.attr);
52 }
53
54 return err;
55 }
56
57 late_initcall(failslab_debugfs_init);
58
59 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
60