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