sysfs: Fail bin file mmap if vma close is implemented.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / mm / failslab.c
blobc5f88f240ddcfc26a8cb2b2fadf66a3345102a5f
1 #include <linux/fault-inject.h>
2 #include <linux/slab.h>
4 static struct {
5 struct fault_attr attr;
6 u32 ignore_gfp_wait;
7 int cache_filter;
8 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
9 struct dentry *ignore_gfp_wait_file;
10 struct dentry *cache_filter_file;
11 #endif
12 } failslab = {
13 .attr = FAULT_ATTR_INITIALIZER,
14 .ignore_gfp_wait = 1,
15 .cache_filter = 0,
18 bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags)
20 if (gfpflags & __GFP_NOFAIL)
21 return false;
23 if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT))
24 return false;
26 if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB))
27 return false;
29 return should_fail(&failslab.attr, size);
32 static int __init setup_failslab(char *str)
34 return setup_fault_attr(&failslab.attr, str);
36 __setup("failslab=", setup_failslab);
38 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
39 static int __init failslab_debugfs_init(void)
41 mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
42 struct dentry *dir;
43 int err;
45 err = init_fault_attr_dentries(&failslab.attr, "failslab");
46 if (err)
47 return err;
48 dir = failslab.attr.dentries.dir;
50 failslab.ignore_gfp_wait_file =
51 debugfs_create_bool("ignore-gfp-wait", mode, dir,
52 &failslab.ignore_gfp_wait);
54 failslab.cache_filter_file =
55 debugfs_create_bool("cache-filter", mode, dir,
56 &failslab.cache_filter);
58 if (!failslab.ignore_gfp_wait_file ||
59 !failslab.cache_filter_file) {
60 err = -ENOMEM;
61 debugfs_remove(failslab.cache_filter_file);
62 debugfs_remove(failslab.ignore_gfp_wait_file);
63 cleanup_fault_attr_dentries(&failslab.attr);
66 return err;
69 late_initcall(failslab_debugfs_init);
71 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */