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9888c340 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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2 | /* |
3 | * Copyright (C) 2012 Red Hat. All rights reserved. | |
606686ee JB |
4 | */ |
5 | ||
9888c340 DS |
6 | #ifndef BTRFS_RCU_STRING_H |
7 | #define BTRFS_RCU_STRING_H | |
8 | ||
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9 | struct rcu_string { |
10 | struct rcu_head rcu; | |
11 | char str[0]; | |
12 | }; | |
13 | ||
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 | ||
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 | }) | |
9888c340 DS |
47 | |
48 | #endif |