1 #include <linux/fault-inject.h> 2 #include <linux/slab.h> 3 4 static 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 14 bool 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 28 static 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 35 static int __init failslab_debugfs_init(void) 36 { 37 struct dentry *dir; 38 umode_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; 52 fail: 53 debugfs_remove_recursive(dir); 54 55 return -ENOMEM; 56 } 57 58 late_initcall(failslab_debugfs_init); 59 60 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 61