1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/fault-inject.h> 2 #include <linux/fault-inject.h>
3 #include <linux/error-injection.h> <<
4 #include <linux/mm.h> 3 #include <linux/mm.h>
5 4
6 static struct { 5 static struct {
7 struct fault_attr attr; 6 struct fault_attr attr;
8 7
9 bool ignore_gfp_highmem; 8 bool ignore_gfp_highmem;
10 bool ignore_gfp_reclaim; 9 bool ignore_gfp_reclaim;
11 u32 min_order; 10 u32 min_order;
12 } fail_page_alloc = { 11 } fail_page_alloc = {
13 .attr = FAULT_ATTR_INITIALIZER, 12 .attr = FAULT_ATTR_INITIALIZER,
14 .ignore_gfp_reclaim = true, 13 .ignore_gfp_reclaim = true,
15 .ignore_gfp_highmem = true, 14 .ignore_gfp_highmem = true,
16 .min_order = 1, 15 .min_order = 1,
17 }; 16 };
18 17
19 static int __init setup_fail_page_alloc(char * 18 static int __init setup_fail_page_alloc(char *str)
20 { 19 {
21 return setup_fault_attr(&fail_page_all 20 return setup_fault_attr(&fail_page_alloc.attr, str);
22 } 21 }
23 __setup("fail_page_alloc=", setup_fail_page_al 22 __setup("fail_page_alloc=", setup_fail_page_alloc);
24 23
25 bool should_fail_alloc_page(gfp_t gfp_mask, un !! 24 bool __should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
26 { 25 {
27 int flags = 0; 26 int flags = 0;
28 27
29 if (order < fail_page_alloc.min_order) 28 if (order < fail_page_alloc.min_order)
30 return false; 29 return false;
31 if (gfp_mask & __GFP_NOFAIL) 30 if (gfp_mask & __GFP_NOFAIL)
32 return false; 31 return false;
33 if (fail_page_alloc.ignore_gfp_highmem 32 if (fail_page_alloc.ignore_gfp_highmem && (gfp_mask & __GFP_HIGHMEM))
34 return false; 33 return false;
35 if (fail_page_alloc.ignore_gfp_reclaim 34 if (fail_page_alloc.ignore_gfp_reclaim &&
36 (gfp_mask & __GFP_DIRE 35 (gfp_mask & __GFP_DIRECT_RECLAIM))
37 return false; 36 return false;
38 37
39 /* See comment in __should_failslab() 38 /* See comment in __should_failslab() */
40 if (gfp_mask & __GFP_NOWARN) 39 if (gfp_mask & __GFP_NOWARN)
41 flags |= FAULT_NOWARN; 40 flags |= FAULT_NOWARN;
42 41
43 return should_fail_ex(&fail_page_alloc 42 return should_fail_ex(&fail_page_alloc.attr, 1 << order, flags);
44 } 43 }
45 ALLOW_ERROR_INJECTION(should_fail_alloc_page, <<
46 44
47 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS 45 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
48 46
49 static int __init fail_page_alloc_debugfs(void 47 static int __init fail_page_alloc_debugfs(void)
50 { 48 {
51 umode_t mode = S_IFREG | 0600; 49 umode_t mode = S_IFREG | 0600;
52 struct dentry *dir; 50 struct dentry *dir;
53 51
54 dir = fault_create_debugfs_attr("fail_ 52 dir = fault_create_debugfs_attr("fail_page_alloc", NULL,
55 &fail_ 53 &fail_page_alloc.attr);
56 54
57 debugfs_create_bool("ignore-gfp-wait", 55 debugfs_create_bool("ignore-gfp-wait", mode, dir,
58 &fail_page_alloc.i 56 &fail_page_alloc.ignore_gfp_reclaim);
59 debugfs_create_bool("ignore-gfp-highme 57 debugfs_create_bool("ignore-gfp-highmem", mode, dir,
60 &fail_page_alloc.i 58 &fail_page_alloc.ignore_gfp_highmem);
61 debugfs_create_u32("min-order", mode, 59 debugfs_create_u32("min-order", mode, dir, &fail_page_alloc.min_order);
62 60
63 return 0; 61 return 0;
64 } 62 }
65 63
66 late_initcall(fail_page_alloc_debugfs); 64 late_initcall(fail_page_alloc_debugfs);
67 65
68 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 66 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
69 67
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