53 lines
1.1 KiB
C
53 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2012 Red Hat. All rights reserved.
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*/
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#ifndef BTRFS_RCU_STRING_H
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#define BTRFS_RCU_STRING_H
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struct rcu_string {
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struct rcu_head rcu;
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char str[];
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};
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static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)
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{
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size_t len = strlen(src) + 1;
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struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) +
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(len * sizeof(char)), mask);
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if (!ret)
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return ret;
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/* Warn if the source got unexpectedly truncated. */
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if (WARN_ON(strscpy(ret->str, src, len) < 0)) {
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kfree(ret);
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return NULL;
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}
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return ret;
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}
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static inline void rcu_string_free(struct rcu_string *str)
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{
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if (str)
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kfree_rcu(str, rcu);
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}
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#define printk_in_rcu(fmt, ...) do { \
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rcu_read_lock(); \
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printk(fmt, __VA_ARGS__); \
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rcu_read_unlock(); \
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} while (0)
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#define printk_ratelimited_in_rcu(fmt, ...) do { \
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rcu_read_lock(); \
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printk_ratelimited(fmt, __VA_ARGS__); \
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rcu_read_unlock(); \
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} while (0)
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#define rcu_str_deref(rcu_str) ({ \
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struct rcu_string *__str = rcu_dereference(rcu_str); \
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__str->str; \
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})
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#endif
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