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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 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS |
9 | struct dentry *ignore_gfp_wait_file; |
10 | struct dentry *cache_filter_file; |
11 | #endif |
12 | } failslab = { |
13 | .attr = FAULT_ATTR_INITIALIZER, |
14 | .ignore_gfp_wait = 1, |
15 | .cache_filter = 0, |
16 | }; |
17 | |
18 | bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags) |
19 | { |
20 | if (gfpflags & __GFP_NOFAIL) |
21 | return false; |
22 | |
23 | if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT)) |
24 | return false; |
25 | |
26 | if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB)) |
27 | return false; |
28 | |
29 | return should_fail(&failslab.attr, size); |
30 | } |
31 | |
32 | static int __init setup_failslab(char *str) |
33 | { |
34 | return setup_fault_attr(&failslab.attr, str); |
35 | } |
36 | __setup("failslab=", setup_failslab); |
37 | |
38 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS |
39 | static int __init failslab_debugfs_init(void) |
40 | { |
41 | mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; |
42 | struct dentry *dir; |
43 | int err; |
44 | |
45 | err = init_fault_attr_dentries(&failslab.attr, "failslab"); |
46 | if (err) |
47 | return err; |
48 | dir = failslab.attr.dentries.dir; |
49 | |
50 | failslab.ignore_gfp_wait_file = |
51 | debugfs_create_bool("ignore-gfp-wait", mode, dir, |
52 | &failslab.ignore_gfp_wait); |
53 | |
54 | failslab.cache_filter_file = |
55 | debugfs_create_bool("cache-filter", mode, dir, |
56 | &failslab.cache_filter); |
57 | |
58 | if (!failslab.ignore_gfp_wait_file || |
59 | !failslab.cache_filter_file) { |
60 | err = -ENOMEM; |
61 | debugfs_remove(failslab.cache_filter_file); |
62 | debugfs_remove(failslab.ignore_gfp_wait_file); |
63 | cleanup_fault_attr_dentries(&failslab.attr); |
64 | } |
65 | |
66 | return err; |
67 | } |
68 | |
69 | late_initcall(failslab_debugfs_init); |
70 | |
71 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |
72 |
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