| | 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 */ |
projects / mirror_ubuntu-artful-kernel.git / blame_incremental