debug.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2005-2019 Junjiro R. Okajima
 */

/*
 * debug print functions
 */

#include "aufs.h"

/* Returns 0, or -errno.  arg is in kp->arg. */
static int param_atomic_t_set(const char *val, const struct kernel_param *kp)
{
	int err, n;

	err = kstrtoint(val, 0, &n);
	if (!err) {
		if (n > 0)
			au_debug_on();
		else
			au_debug_off();
	}
	return err;
}

/* Returns length written or -errno.  Buffer is 4k (ie. be short!) */
static int param_atomic_t_get(char *buffer, const struct kernel_param *kp)
{
	atomic_t *a;

	a = kp->arg;
	return sprintf(buffer, "%d", atomic_read(a));
}

static struct kernel_param_ops param_ops_atomic_t = {
	.set = param_atomic_t_set,
	.get = param_atomic_t_get
	/* void (*free)(void *arg) */
};

atomic_t aufs_debug = ATOMIC_INIT(0);
MODULE_PARM_DESC(debug, "debug print");
module_param_named(debug, aufs_debug, atomic_t, 0664);