LXR linux/mm/failslab.c

   1#include <linux/fault-inject.h>
   2#include <linux/slab.h>
   3#include <linux/mm.h>
   4#include "slab.h"
   5
   6static 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
  16bool 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
  34static 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
  41static 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;
  58fail:
  59        debugfs_remove_recursive(dir);
  60
  61        return -ENOMEM;
  62}
  63
  64late_initcall(failslab_debugfs_init);
  65
  66#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  67