LXR linux/mm/failslab.c

   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
   7static 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
  17bool __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 && (gfpflags & __GFP_RECLAIM))
  27                return false;
  28
  29        if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))
  30                return false;
  31
  32        return should_fail(&failslab.attr, s->object_size);
  33}
  34
  35static int __init setup_failslab(char *str)
  36{
  37        return setup_fault_attr(&failslab.attr, str);
  38}
  39__setup("failslab=", setup_failslab);
  40
  41#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
  42static int __init failslab_debugfs_init(void)
  43{
  44        struct dentry *dir;
  45        umode_t mode = S_IFREG | 0600;
  46
  47        dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
  48        if (IS_ERR(dir))
  49                return PTR_ERR(dir);
  50
  51        if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
  52                                &failslab.ignore_gfp_reclaim))
  53                goto fail;
  54        if (!debugfs_create_bool("cache-filter", mode, dir,
  55                                &failslab.cache_filter))
  56                goto fail;
  57
  58        return 0;
  59fail:
  60        debugfs_remove_recursive(dir);
  61
  62        return -ENOMEM;
  63}
  64
  65late_initcall(failslab_debugfs_init);
  66
  67#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
  68