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63 lines
1.3 KiB
63 lines
1.3 KiB
/* 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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