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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 */ |