64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _FS_CEPH_STRING_TABLE_H
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#define _FS_CEPH_STRING_TABLE_H
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#include <linux/types.h>
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#include <linux/kref.h>
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#include <linux/rbtree.h>
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#include <linux/rcupdate.h>
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struct ceph_string {
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struct kref kref;
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union {
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struct rb_node node;
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struct rcu_head rcu;
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};
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size_t len;
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char str[];
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};
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extern void ceph_release_string(struct kref *ref);
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extern struct ceph_string *ceph_find_or_create_string(const char *str,
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size_t len);
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extern bool ceph_strings_empty(void);
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static inline struct ceph_string *ceph_get_string(struct ceph_string *str)
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{
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kref_get(&str->kref);
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return str;
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}
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static inline void ceph_put_string(struct ceph_string *str)
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{
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if (!str)
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return;
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kref_put(&str->kref, ceph_release_string);
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}
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static inline int ceph_compare_string(struct ceph_string *cs,
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const char* str, size_t len)
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{
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size_t cs_len = cs ? cs->len : 0;
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if (cs_len != len)
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return cs_len - len;
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if (len == 0)
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return 0;
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return strncmp(cs->str, str, len);
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}
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#define ceph_try_get_string(x) \
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({ \
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struct ceph_string *___str; \
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rcu_read_lock(); \
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for (;;) { \
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___str = rcu_dereference(x); \
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if (!___str || \
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kref_get_unless_zero(&___str->kref)) \
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break; \
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} \
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rcu_read_unlock(); \
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(___str); \
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})
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#endif
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