Commit | Line | Data |
---|---|---|
773ff60e | 1 | #include <linux/fault-inject.h> |
4c13dd3b | 2 | #include <linux/slab.h> |
773ff60e AM |
3 | |
4 | static struct { | |
5 | struct fault_attr attr; | |
6 | u32 ignore_gfp_wait; | |
4c13dd3b | 7 | int cache_filter; |
773ff60e AM |
8 | } failslab = { |
9 | .attr = FAULT_ATTR_INITIALIZER, | |
10 | .ignore_gfp_wait = 1, | |
4c13dd3b | 11 | .cache_filter = 0, |
773ff60e AM |
12 | }; |
13 | ||
4c13dd3b | 14 | bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags) |
773ff60e AM |
15 | { |
16 | if (gfpflags & __GFP_NOFAIL) | |
17 | return false; | |
18 | ||
19 | if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT)) | |
20 | return false; | |
21 | ||
4c13dd3b DM |
22 | if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB)) |
23 | return false; | |
24 | ||
773ff60e AM |
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 | |
773ff60e AM |
35 | static int __init failslab_debugfs_init(void) |
36 | { | |
37 | mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; | |
773ff60e AM |
38 | int err; |
39 | ||
40 | err = init_fault_attr_dentries(&failslab.attr, "failslab"); | |
41 | if (err) | |
42 | return err; | |
773ff60e | 43 | |
810f09b8 AM |
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; | |
4c13dd3b | 50 | |
810f09b8 AM |
51 | return 0; |
52 | fail: | |
53 | cleanup_fault_attr_dentries(&failslab.attr); | |
773ff60e | 54 | |
810f09b8 | 55 | return -ENOMEM; |
773ff60e AM |
56 | } |
57 | ||
58 | late_initcall(failslab_debugfs_init); | |
59 | ||
60 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |