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 && 27 (gfpflags & __GFP_DIRECT_RECLAIM)) 28 return false; 29 30 if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB)) 31 return false; 32 33 if (gfpflags & __GFP_NOWARN) 34 failslab.attr.no_warn = true; 35 36 return should_fail(&failslab.attr, s->object_size); 37 } 38 39 static int __init setup_failslab(char *str) 40 { 41 return setup_fault_attr(&failslab.attr, str); 42 } 43 __setup("failslab=", setup_failslab); 44 45 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS 46 static int __init failslab_debugfs_init(void) 47 { 48 struct dentry *dir; 49 umode_t mode = S_IFREG | 0600; 50 51 dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr); 52 if (IS_ERR(dir)) 53 return PTR_ERR(dir); 54 55 debugfs_create_bool("ignore-gfp-wait", mode, dir, 56 &failslab.ignore_gfp_reclaim); 57 debugfs_create_bool("cache-filter", mode, dir, 58 &failslab.cache_filter); 59 60 return 0; 61 } 62 63 late_initcall(failslab_debugfs_init); 64 65 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ 66