blob: 7c6ea6493f804cfaf1d85c88c4f2e8a634ddf002 [file] [log] [blame]
Akinobu Mita773ff602008-12-23 19:37:01 +09001#include <linux/fault-inject.h>
2
3static 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
14bool 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
25static 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
33static 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
57late_initcall(failslab_debugfs_init);
58
59#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */