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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 */ |