Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg...
[linux-2.6.git] / mm / failslab.c
1 #include <linux/fault-inject.h>
2 #include <linux/slab.h>
3
4 static struct {
5         struct fault_attr attr;
6         u32 ignore_gfp_wait;
7         int cache_filter;
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         mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
38         int err;
39
40         err = init_fault_attr_dentries(&failslab.attr, "failslab");
41         if (err)
42                 return err;
43
44         if (!debugfs_create_bool("ignore-gfp-wait", mode, failslab.attr.dir,
45                                 &failslab.ignore_gfp_wait))
46                 goto fail;
47         if (!debugfs_create_bool("cache-filter", mode, failslab.attr.dir,
48                                 &failslab.cache_filter))
49                 goto fail;
50
51         return 0;
52 fail:
53         cleanup_fault_attr_dentries(&failslab.attr);
54
55         return -ENOMEM;
56 }
57
58 late_initcall(failslab_debugfs_init);
59
60 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */