1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Copyright (C) 2012 Red Hat. All rights reserved.
4 */
5
6 #ifndef BTRFS_RCU_STRING_H
7 #define BTRFS_RCU_STRING_H
8
9 struct rcu_string {
10 struct rcu_head rcu;
11 char str[];
12 };
13
rcu_string_strdup(const char * src,gfp_t mask)14 static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)
15 {
16 size_t len = strlen(src) + 1;
17 struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) +
18 (len * sizeof(char)), mask);
19 if (!ret)
20 return ret;
21 strncpy(ret->str, src, len);
22 return ret;
23 }
24
rcu_string_free(struct rcu_string * str)25 static inline void rcu_string_free(struct rcu_string *str)
26 {
27 if (str)
28 kfree_rcu(str, rcu);
29 }
30
31 #define printk_in_rcu(fmt, ...) do { \
32 rcu_read_lock(); \
33 printk(fmt, __VA_ARGS__); \
34 rcu_read_unlock(); \
35 } while (0)
36
37 #define printk_ratelimited_in_rcu(fmt, ...) do { \
38 rcu_read_lock(); \
39 printk_ratelimited(fmt, __VA_ARGS__); \
40 rcu_read_unlock(); \
41 } while (0)
42
43 #define rcu_str_deref(rcu_str) ({ \
44 struct rcu_string *__str = rcu_dereference(rcu_str); \
45 __str->str; \
46 })
47
48 #endif
49
