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 &&
27			(gfpflags & __GFP_DIRECT_RECLAIM))
28		return false;
29
30	if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))
31		return false;
32
33	return should_fail(&failslab.attr, s->object_size);
34}
35
36static int __init setup_failslab(char *str)
37{
38	return setup_fault_attr(&failslab.attr, str);
39}
40__setup("failslab=", setup_failslab);
41
42#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
43static int __init failslab_debugfs_init(void)
44{
45	struct dentry *dir;
46	umode_t mode = S_IFREG | 0600;
47
48	dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
49	if (IS_ERR(dir))
50		return PTR_ERR(dir);
51
52	debugfs_create_bool("ignore-gfp-wait", mode, dir,
53			    &failslab.ignore_gfp_reclaim);
54	debugfs_create_bool("cache-filter", mode, dir,
55			    &failslab.cache_filter);
 
 
56
57	return 0;
 
 
 
 
58}
59
60late_initcall(failslab_debugfs_init);
61
62#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 */