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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
- 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;
- strncpy(ret->str, src, len);
- 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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