Root/mm/failslab.c

1#include <linux/fault-inject.h>
2#include <linux/slab.h>
3
4static 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
14bool 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
28static 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
35static 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;
52fail:
53    debugfs_remove_recursive(dir);
54
55    return -ENOMEM;
56}
57
58late_initcall(failslab_debugfs_init);
59
60#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
61

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