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 | S_IRUSR | S_IWUSR; 46 47 dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr); 48 if (IS_ERR(dir)) 49 return PTR_ERR(dir); 50 51 if (!debugfs_create_bool("ignore-gfp-wait", mode, dir, 52 &failslab.ignore_gfp_reclaim)) 53 goto fail; 54 if (!debugfs_create_bool("cache-filter", mode, dir, 55 &failslab.cache_filter)) 56 goto fail; 57 58 return 0; 59 fail: 60 debugfs_remove_recursive(dir); 61 62 return -ENOMEM; 63 } 64 65 late_initcall(failslab_debugfs_init); 66 67 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 68