projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 9888c340 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 606686ee JB |
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 | ||
| 606686ee JB |
9 | struct rcu_string { |
| 10 | struct rcu_head rcu; | |
| 7593f4c5 | 11 | char str[]; |
| 606686ee JB |
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; | |
| 63d5429f AC |
21 | /* Warn if the source got unexpectedly truncated. */ |
| 22 | if (WARN_ON(strscpy(ret->str, src, len) < 0)) { | |
| 23 | kfree(ret); | |
| 24 | return NULL; | |
| 25 | } | |
| 606686ee JB |
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 | }) | |
| 9888c340 DS |
51 | |
| 52 | #endif |