Release 4.17 fs/btrfs/rcu-string.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2012 Red Hat.  All rights reserved.
 */

#ifndef BTRFS_RCU_STRING_H

#define BTRFS_RCU_STRING_H


struct rcu_string {
	
struct rcu_head rcu;
	
char str[0];
};



static inline struct rcu_string *rcu_string_strdup(const char *src, gfp_t mask)
{
	size_t len = strlen(src) + 1;
	struct rcu_string *ret = kzalloc(sizeof(struct rcu_string) +
					 (len * sizeof(char)), mask);
	if (!ret)
		return ret;
	strncpy(ret->str, src, len);
	return ret;
}

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static inline void rcu_string_free(struct rcu_string *str)
{
	if (str)
		kfree_rcu(str, rcu);
}

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#define printk_in_rcu(fmt, ...) do {    \
        rcu_read_lock();                \
        printk(fmt, __VA_ARGS__);       \
        rcu_read_unlock();              \
} while (0)


#define printk_ratelimited_in_rcu(fmt, ...) do {    \
        rcu_read_lock();                                \
        printk_ratelimited(fmt, __VA_ARGS__);           \
        rcu_read_unlock();                              \
} while (0)


#define rcu_str_deref(rcu_str) ({                              \
        struct rcu_string *__str = rcu_dereference(rcu_str);    \
        __str->str;                                             \
})

#endif
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Directory: fs/btrfs

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