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	mode_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 */

 1#include <linux/fault-inject.h>
 2#include <linux/slab.h>
 3#include <linux/mm.h>
 4#include "slab.h"
 5
 6static 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
16bool 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
34static 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
41static 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;
58fail:
59	debugfs_remove_recursive(dir);
60
61	return -ENOMEM;
62}
63
64late_initcall(failslab_debugfs_init);
65
66#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */