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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2012 Red Hat. All rights reserved.
*/
#ifndef BTRFS_RCU_STRING_H
#define BTRFS_RCU_STRING_H
#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/rcupdate.h>
#include <linux/printk.h>
struct rcu_string {
struct rcu_head rcu;
char str[];
};
static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)
{
size_t len = strlen(src) + 1;
struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) +
(len * sizeof(char)), mask);
if (!ret)
return ret;
/* Warn if the source got unexpectedly truncated. */
if (WARN_ON(strscpy(ret->str, src, len) < 0)) {
kfree(ret);
return NULL;
}
return ret;
}
static inline void rcu_string_free(struct rcu_string *str)
{
if (str)
kfree_rcu(str, rcu);
}
#define printk_in_rcu(fmt, ...) do { \
rcu_read_lock(); \
printk(fmt, __VA_ARGS__); \
rcu_read_unlock(); \
} while (0)
#define printk_ratelimited_in_rcu(fmt, ...) do { \
rcu_read_lock(); \
printk_ratelimited(fmt, __VA_ARGS__); \
rcu_read_unlock(); \
} while (0)
#define rcu_str_deref(rcu_str) ({ \
struct rcu_string *__str = rcu_dereference(rcu_str); \
__str->str; \
})
#endif
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