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// 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 | S_IRUSR | S_IWUSR;
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 */