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 | |
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(size: sizeof(struct rcu_string) + |
18 | (len * sizeof(char)), flags: mask); |
19 | if (!ret) |
20 | return ret; |
21 | /* Warn if the source got unexpectedly truncated. */ |
22 | if (WARN_ON(strscpy(ret->str, src, len) < 0)) { |
23 | kfree(objp: ret); |
24 | return NULL; |
25 | } |
26 | return ret; |
27 | } |
28 | |
29 | static inline void rcu_string_free(struct rcu_string *str) |
30 | { |
31 | if (str) |
32 | kfree_rcu(str, rcu); |
33 | } |
34 | |
35 | #define printk_in_rcu(fmt, ...) do { \ |
36 | rcu_read_lock(); \ |
37 | printk(fmt, __VA_ARGS__); \ |
38 | rcu_read_unlock(); \ |
39 | } while (0) |
40 | |
41 | #define printk_ratelimited_in_rcu(fmt, ...) do { \ |
42 | rcu_read_lock(); \ |
43 | printk_ratelimited(fmt, __VA_ARGS__); \ |
44 | rcu_read_unlock(); \ |
45 | } while (0) |
46 | |
47 | #define rcu_str_deref(rcu_str) ({ \ |
48 | struct rcu_string *__str = rcu_dereference(rcu_str); \ |
49 | __str->str; \ |
50 | }) |
51 | |
52 | #endif |
53 | |