Linux kernel mirror (for testing)
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linux
1// SPDX-License-Identifier: GPL-2.0
2#include <linux/fault-inject.h>
3#include <linux/slab.h>
4#include <linux/mm.h>
5#include "slab.h"
6
7static struct {
8 struct fault_attr attr;
9 bool ignore_gfp_reclaim;
10 bool cache_filter;
11} failslab = {
12 .attr = FAULT_ATTR_INITIALIZER,
13 .ignore_gfp_reclaim = true,
14 .cache_filter = false,
15};
16
17bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
18{
19 /* No fault-injection for bootstrap cache */
20 if (unlikely(s == kmem_cache))
21 return false;
22
23 if (gfpflags & __GFP_NOFAIL)
24 return false;
25
26 if (failslab.ignore_gfp_reclaim && (gfpflags & __GFP_RECLAIM))
27 return false;
28
29 if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))
30 return false;
31
32 return should_fail(&failslab.attr, s->object_size);
33}
34
35static int __init setup_failslab(char *str)
36{
37 return setup_fault_attr(&failslab.attr, str);
38}
39__setup("failslab=", setup_failslab);
40
41#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
42static int __init failslab_debugfs_init(void)
43{
44 struct dentry *dir;
45 umode_t mode = S_IFREG | 0600;
46
47 dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
48 if (IS_ERR(dir))
49 return PTR_ERR(dir);
50
51 if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
52 &failslab.ignore_gfp_reclaim))
53 goto fail;
54 if (!debugfs_create_bool("cache-filter", mode, dir,
55 &failslab.cache_filter))
56 goto fail;
57
58 return 0;
59fail:
60 debugfs_remove_recursive(dir);
61
62 return -ENOMEM;
63}
64
65late_initcall(failslab_debugfs_init);
66
67#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */