failslab.c

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#include <linux/fault-inject.h>
#include <linux/slab.h>

static struct {
    struct fault_attr attr;
    u32 ignore_gfp_wait;
    int cache_filter;
} failslab = {
    .attr = FAULT_ATTR_INITIALIZER,
    .ignore_gfp_wait = 1,
    .cache_filter = 0,
};

bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags)
{
    if (gfpflags & __GFP_NOFAIL)
        return false;

        if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT))
        return false;

    if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB))
        return false;

    return should_fail(&failslab.attr, 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_wait))
        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 */