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773ff60e AM |
1 | #include <linux/fault-inject.h> |
2 | ||
3 | static struct { | |
4 | struct fault_attr attr; | |
5 | u32 ignore_gfp_wait; | |
6 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
7 | struct dentry *ignore_gfp_wait_file; | |
8 | #endif | |
9 | } failslab = { | |
10 | .attr = FAULT_ATTR_INITIALIZER, | |
11 | .ignore_gfp_wait = 1, | |
12 | }; | |
13 | ||
14 | bool should_failslab(size_t size, gfp_t gfpflags) | |
15 | { | |
16 | if (gfpflags & __GFP_NOFAIL) | |
17 | return false; | |
18 | ||
19 | if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT)) | |
20 | return false; | |
21 | ||
22 | return should_fail(&failslab.attr, size); | |
23 | } | |
24 | ||
25 | static int __init setup_failslab(char *str) | |
26 | { | |
27 | return setup_fault_attr(&failslab.attr, str); | |
28 | } | |
29 | __setup("failslab=", setup_failslab); | |
30 | ||
31 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
32 | ||
33 | static int __init failslab_debugfs_init(void) | |
34 | { | |
35 | mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; | |
36 | struct dentry *dir; | |
37 | int err; | |
38 | ||
39 | err = init_fault_attr_dentries(&failslab.attr, "failslab"); | |
40 | if (err) | |
41 | return err; | |
42 | dir = failslab.attr.dentries.dir; | |
43 | ||
44 | failslab.ignore_gfp_wait_file = | |
45 | debugfs_create_bool("ignore-gfp-wait", mode, dir, | |
46 | &failslab.ignore_gfp_wait); | |
47 | ||
48 | if (!failslab.ignore_gfp_wait_file) { | |
49 | err = -ENOMEM; | |
50 | debugfs_remove(failslab.ignore_gfp_wait_file); | |
51 | cleanup_fault_attr_dentries(&failslab.attr); | |
52 | } | |
53 | ||
54 | return err; | |
55 | } | |
56 | ||
57 | late_initcall(failslab_debugfs_init); | |
58 | ||
59 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |