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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 | struct dentry *dir; |
38 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
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: |
53 | debugfs_remove_recursive(dir); |
54 | |
55 | return -ENOMEM; |
56 | } |
57 | |
58 | late_initcall(failslab_debugfs_init); |
59 | |
60 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |
61 |
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