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 | |
7 | static 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 | |
17 | bool __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 | |
35 | static 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 |
42 | static 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 | debugfs_create_bool("ignore-gfp-wait" , mode, dir, |
52 | &failslab.ignore_gfp_reclaim); |
53 | debugfs_create_bool("cache-filter" , mode, dir, |
54 | &failslab.cache_filter); |
55 | |
56 | return 0; |
57 | } |
58 | |
59 | late_initcall(failslab_debugfs_init); |
60 | |
61 | #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ |
62 | |