162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Copyright (C) 2012 Red Hat. All rights reserved. 462306a36Sopenharmony_ci */ 562306a36Sopenharmony_ci 662306a36Sopenharmony_ci#ifndef BTRFS_RCU_STRING_H 762306a36Sopenharmony_ci#define BTRFS_RCU_STRING_H 862306a36Sopenharmony_ci 962306a36Sopenharmony_cistruct rcu_string { 1062306a36Sopenharmony_ci struct rcu_head rcu; 1162306a36Sopenharmony_ci char str[]; 1262306a36Sopenharmony_ci}; 1362306a36Sopenharmony_ci 1462306a36Sopenharmony_cistatic inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask) 1562306a36Sopenharmony_ci{ 1662306a36Sopenharmony_ci size_t len = strlen(src) + 1; 1762306a36Sopenharmony_ci struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) + 1862306a36Sopenharmony_ci (len * sizeof(char)), mask); 1962306a36Sopenharmony_ci if (!ret) 2062306a36Sopenharmony_ci return ret; 2162306a36Sopenharmony_ci /* Warn if the source got unexpectedly truncated. */ 2262306a36Sopenharmony_ci if (WARN_ON(strscpy(ret->str, src, len) < 0)) { 2362306a36Sopenharmony_ci kfree(ret); 2462306a36Sopenharmony_ci return NULL; 2562306a36Sopenharmony_ci } 2662306a36Sopenharmony_ci return ret; 2762306a36Sopenharmony_ci} 2862306a36Sopenharmony_ci 2962306a36Sopenharmony_cistatic inline void rcu_string_free(struct rcu_string *str) 3062306a36Sopenharmony_ci{ 3162306a36Sopenharmony_ci if (str) 3262306a36Sopenharmony_ci kfree_rcu(str, rcu); 3362306a36Sopenharmony_ci} 3462306a36Sopenharmony_ci 3562306a36Sopenharmony_ci#define printk_in_rcu(fmt, ...) do { \ 3662306a36Sopenharmony_ci rcu_read_lock(); \ 3762306a36Sopenharmony_ci printk(fmt, __VA_ARGS__); \ 3862306a36Sopenharmony_ci rcu_read_unlock(); \ 3962306a36Sopenharmony_ci} while (0) 4062306a36Sopenharmony_ci 4162306a36Sopenharmony_ci#define printk_ratelimited_in_rcu(fmt, ...) do { \ 4262306a36Sopenharmony_ci rcu_read_lock(); \ 4362306a36Sopenharmony_ci printk_ratelimited(fmt, __VA_ARGS__); \ 4462306a36Sopenharmony_ci rcu_read_unlock(); \ 4562306a36Sopenharmony_ci} while (0) 4662306a36Sopenharmony_ci 4762306a36Sopenharmony_ci#define rcu_str_deref(rcu_str) ({ \ 4862306a36Sopenharmony_ci struct rcu_string *__str = rcu_dereference(rcu_str); \ 4962306a36Sopenharmony_ci __str->str; \ 5062306a36Sopenharmony_ci}) 5162306a36Sopenharmony_ci 5262306a36Sopenharmony_ci#endif 53