#include <linux/fault-inject.h> #include <linux/gfp.h> #include <linux/slab.h> static struct { struct fault_attr attr; u32 ignore_gfp_wait; int cache_filter; #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS struct dentry *ignore_gfp_wait_file; struct dentry *cache_filter_file; #endif } failslab = { .attr = FAULT_ATTR_INITIALIZER, .ignore_gfp_wait = 1, .cache_filter = 0, }; bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags) { if (gfpflags & __GFP_NOFAIL) return false; if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT)) return false; if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB)) return false; return should_fail(&failslab.attr, size); } static int __init setup_failslab(char *str) { return setup_fault_attr(&failslab.attr, str); } __setup("failslab=", setup_failslab); #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS static int __init failslab_debugfs_init(void) { mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; struct dentry *dir; int err; err = init_fault_attr_dentries(&failslab.attr, "failslab"); if (err) return err; dir = failslab.attr.dentries.dir; failslab.ignore_gfp_wait_file = debugfs_create_bool("ignore-gfp-wait", mode, dir, &failslab.ignore_gfp_wait); failslab.cache_filter_file = debugfs_create_bool("cache-filter", mode, dir, &failslab.cache_filter); if (!failslab.ignore_gfp_wait_file || !failslab.cache_filter_file) { err = -ENOMEM; debugfs_remove(failslab.cache_filter_file); debugfs_remove(failslab.ignore_gfp_wait_file); cleanup_fault_attr_dentries(&failslab.attr); } return err; } late_initcall(failslab_debugfs_init); #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */