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51e92737 YZ |
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 | ||
9 | struct 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 | ||
19 | extern void ceph_release_string(struct kref *ref); | |
20 | extern struct ceph_string *ceph_find_or_create_string(const char *str, | |
21 | size_t len); | |
22 | extern bool ceph_strings_empty(void); | |
23 | ||
24 | static inline struct ceph_string *ceph_get_string(struct ceph_string *str) | |
25 | { | |
26 | kref_get(&str->kref); | |
27 | return str; | |
28 | } | |
29 | ||
30 | static 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 | ||
37 | static 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 |