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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /include/linux/ceph/string_table.h | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/linux/ceph/string_table.h')
-rw-r--r-- | include/linux/ceph/string_table.h | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/include/linux/ceph/string_table.h b/include/linux/ceph/string_table.h new file mode 100644 index 000000000..a4a9962d1 --- /dev/null +++ b/include/linux/ceph/string_table.h @@ -0,0 +1,63 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#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; +} + +static inline void ceph_put_string(struct ceph_string *str) +{ + if (!str) + return; + kref_put(&str->kref, ceph_release_string); +} + +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); +} + +#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 |