Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#ifndef _FS_CEPH_STRING_TABLE_H
2#define _FS_CEPH_STRING_TABLE_H
3
4#include <linux/types.h>
5#include <linux/kref.h>
6#include <linux/rbtree.h>
7#include <linux/rcupdate.h>
8
9struct ceph_string {
10 struct kref kref;
11 union {
12 struct rb_node node;
13 struct rcu_head rcu;
14 };
15 size_t len;
16 char str[];
17};
18
19extern void ceph_release_string(struct kref *ref);
20extern struct ceph_string *ceph_find_or_create_string(const char *str,
21 size_t len);
22extern bool ceph_strings_empty(void);
23
24static inline struct ceph_string *ceph_get_string(struct ceph_string *str)
25{
26 kref_get(&str->kref);
27 return str;
28}
29
30static inline void ceph_put_string(struct ceph_string *str)
31{
32 if (!str)
33 return;
34 kref_put(&str->kref, ceph_release_string);
35}
36
37static inline int ceph_compare_string(struct ceph_string *cs,
38 const char* str, size_t len)
39{
40 size_t cs_len = cs ? cs->len : 0;
41 if (cs_len != len)
42 return cs_len - len;
43 if (len == 0)
44 return 0;
45 return strncmp(cs->str, str, len);
46}
47
48#define ceph_try_get_string(x) \
49({ \
50 struct ceph_string *___str; \
51 rcu_read_lock(); \
52 for (;;) { \
53 ___str = rcu_dereference(x); \
54 if (!___str || \
55 kref_get_unless_zero(&___str->kref)) \
56 break; \
57 } \
58 rcu_read_unlock(); \
59 (___str); \
60})
61
62#endif