You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
1.5 KiB
67 lines
1.5 KiB
// SPDX-License-Identifier: GPL-2.0
|
|
#include <linux/fault-inject.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mm.h>
|
|
#include "slab.h"
|
|
|
|
static struct {
|
|
struct fault_attr attr;
|
|
bool ignore_gfp_reclaim;
|
|
bool cache_filter;
|
|
} failslab = {
|
|
.attr = FAULT_ATTR_INITIALIZER,
|
|
.ignore_gfp_reclaim = true,
|
|
.cache_filter = false,
|
|
};
|
|
|
|
bool should_failslab(struct kmem_cache *s, gfp_t gfpflags)
|
|
{
|
|
/* No fault-injection for bootstrap cache */
|
|
if (unlikely(s == kmem_cache))
|
|
return false;
|
|
|
|
if (gfpflags & __GFP_NOFAIL)
|
|
return false;
|
|
|
|
if (failslab.ignore_gfp_reclaim && (gfpflags & __GFP_RECLAIM))
|
|
return false;
|
|
|
|
if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))
|
|
return false;
|
|
|
|
return should_fail(&failslab.attr, s->object_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)
|
|
{
|
|
struct dentry *dir;
|
|
umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
|
|
|
|
dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
|
|
if (IS_ERR(dir))
|
|
return PTR_ERR(dir);
|
|
|
|
if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
|
|
&failslab.ignore_gfp_reclaim))
|
|
goto fail;
|
|
if (!debugfs_create_bool("cache-filter", mode, dir,
|
|
&failslab.cache_filter))
|
|
goto fail;
|
|
|
|
return 0;
|
|
fail:
|
|
debugfs_remove_recursive(dir);
|
|
|
|
return -ENOMEM;
|
|
}
|
|
|
|
late_initcall(failslab_debugfs_init);
|
|
|
|
#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
|
|
|