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1 | #include <linux/fault-inject.h> | |
2 | #include <linux/slab.h> | |
3 | #include <linux/mm.h> | |
4 | #include "slab.h" | |
5 | ||
6 | static struct { | |
7 | struct fault_attr attr; | |
8 | bool ignore_gfp_reclaim; | |
9 | bool cache_filter; | |
10 | } failslab = { | |
11 | .attr = FAULT_ATTR_INITIALIZER, | |
12 | .ignore_gfp_reclaim = true, | |
13 | .cache_filter = false, | |
14 | }; | |
15 | ||
16 | bool should_failslab(struct kmem_cache *s, gfp_t gfpflags) | |
17 | { | |
18 | /* No fault-injection for bootstrap cache */ | |
19 | if (unlikely(s == kmem_cache)) | |
20 | return false; | |
21 | ||
22 | if (gfpflags & __GFP_NOFAIL) | |
23 | return false; | |
24 | ||
25 | if (failslab.ignore_gfp_reclaim && (gfpflags & __GFP_RECLAIM)) | |
26 | return false; | |
27 | ||
28 | if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB)) | |
29 | return false; | |
30 | ||
31 | return should_fail(&failslab.attr, s->object_size); | |
32 | } | |
33 | ||
34 | static int __init setup_failslab(char *str) | |
35 | { | |
36 | return setup_fault_attr(&failslab.attr, str); | |
37 | } | |
38 | __setup("failslab=", setup_failslab); | |
39 | ||
40 | #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS | |
41 | static int __init failslab_debugfs_init(void) | |
42 | { | |
43 | struct dentry *dir; | |
44 | umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; | |
45 | ||
46 | dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr); | |
47 | if (IS_ERR(dir)) | |
48 | return PTR_ERR(dir); | |
49 | ||
50 | if (!debugfs_create_bool("ignore-gfp-wait", mode, dir, | |
51 | &failslab.ignore_gfp_reclaim)) | |
52 | goto fail; | |
53 | if (!debugfs_create_bool("cache-filter", mode, dir, | |
54 | &failslab.cache_filter)) | |
55 | goto fail; | |
56 | ||
57 | return 0; | |
58 | fail: | |
59 | debugfs_remove_recursive(dir); | |
60 | ||
61 | return -ENOMEM; | |
62 | } | |
63 | ||
64 | late_initcall(failslab_debugfs_init); | |
65 | ||
66 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |