1 #include <linux/fault-inject.h> 2 #include <linux/slab.h> 3 #include <linux/mm.h> 4 #include "slab.h" 5 6 static struct { 7 struct fault_attr attr; 8 bool ignore_gfp_reclaim; 9 bool cache_filter; 10 } failslab = { 11 .attr = FAULT_ATTR_INITIALIZER, 12 .ignore_gfp_reclaim = true, 13 .cache_filter = false, 14 }; 15 16 bool should_failslab(struct kmem_cache *s, gfp_t gfpflags) 17 { 18 /* No fault-injection for bootstrap cache */ 19 if (unlikely(s == kmem_cache)) 20 return false; 21 22 if (gfpflags & __GFP_NOFAIL) 23 return false; 24 25 if (failslab.ignore_gfp_reclaim && (gfpflags & __GFP_RECLAIM)) 26 return false; 27 28 if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB)) 29 return false; 30 31 return should_fail(&failslab.attr, s->object_size); 32 } 33 34 static int __init setup_failslab(char *str) 35 { 36 return setup_fault_attr(&failslab.attr, str); 37 } 38 __setup("failslab=", setup_failslab); 39 40 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS 41 static int __init failslab_debugfs_init(void) 42 { 43 struct dentry *dir; 44 umode_t mode = S_IFREG | S_IRUSR | S_IWUSR; 45 46 dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr); 47 if (IS_ERR(dir)) 48 return PTR_ERR(dir); 49 50 if (!debugfs_create_bool("ignore-gfp-wait", mode, dir, 51 &failslab.ignore_gfp_reclaim)) 52 goto fail; 53 if (!debugfs_create_bool("cache-filter", mode, dir, 54 &failslab.cache_filter)) 55 goto fail; 56 57 return 0; 58 fail: 59 debugfs_remove_recursive(dir); 60 61 return -ENOMEM; 62 } 63 64 late_initcall(failslab_debugfs_init); 65 66 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 67