Release 4.10 include/linux/ceph/string_table.h

#ifndef _FS_CEPH_STRING_TABLE_H

#define _FS_CEPH_STRING_TABLE_H

#include <linux/types.h>
#include <linux/kref.h>
#include <linux/rbtree.h>
#include <linux/rcupdate.h>


struct ceph_string {
	
struct kref kref;
	union {
		
struct rb_node node;
		
struct rcu_head rcu;
	};
	
size_t len;
	
char str[];
};

extern void ceph_release_string(struct kref *ref);
extern struct ceph_string *ceph_find_or_create_string(const char *str,
						      size_t len);
extern bool ceph_strings_empty(void);



static inline struct ceph_string *ceph_get_string(struct ceph_string *str)
{
	kref_get(&str->kref);
	return str;
}

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static inline void ceph_put_string(struct ceph_string *str)
{
	if (!str)
		return;
	kref_put(&str->kref, ceph_release_string);
}

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static inline int ceph_compare_string(struct ceph_string *cs,
				      const char* str, size_t len)
{
	size_t cs_len = cs ? cs->len : 0;
	if (cs_len != len)
		return cs_len - len;
	if (len == 0)
		return 0;
	return strncmp(cs->str, str, len);
}

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#define ceph_try_get_string(x)					\
({                                                              \
        struct ceph_string *___str;                             \
        rcu_read_lock();                                        \
        for (;;) {                                              \
                ___str = rcu_dereference(x);                    \
                if (!___str ||                                  \
                    kref_get_unless_zero(&___str->kref))        \
                        break;                                  \
        }                                                       \
        rcu_read_unlock();                                      \
        (___str);                                               \
})

#endif
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Directory: include/linux/ceph

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