cregit-Linux how code gets into the kernel

Release 4.12 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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Yan, Zheng204100.00%1100.00%
Total204100.00%1100.00%
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