LCOV - code coverage report
Current view: top level - include/linux - mbcache.h (source / functions) Hit Total Coverage
Test: landlock.info Lines: 0 4 0.0 %
Date: 2021-04-22 12:43:58 Functions: 0 1 0.0 %

          Line data    Source code
       1             : /* SPDX-License-Identifier: GPL-2.0 */
       2             : #ifndef _LINUX_MBCACHE_H
       3             : #define _LINUX_MBCACHE_H
       4             : 
       5             : #include <linux/hash.h>
       6             : #include <linux/list_bl.h>
       7             : #include <linux/list.h>
       8             : #include <linux/atomic.h>
       9             : #include <linux/fs.h>
      10             : 
      11             : struct mb_cache;
      12             : 
      13             : struct mb_cache_entry {
      14             :         /* List of entries in cache - protected by cache->c_list_lock */
      15             :         struct list_head        e_list;
      16             :         /* Hash table list - protected by hash chain bitlock */
      17             :         struct hlist_bl_node    e_hash_list;
      18             :         atomic_t                e_refcnt;
      19             :         /* Key in hash - stable during lifetime of the entry */
      20             :         u32                     e_key;
      21             :         u32                     e_referenced:1;
      22             :         u32                     e_reusable:1;
      23             :         /* User provided value - stable during lifetime of the entry */
      24             :         u64                     e_value;
      25             : };
      26             : 
      27             : struct mb_cache *mb_cache_create(int bucket_bits);
      28             : void mb_cache_destroy(struct mb_cache *cache);
      29             : 
      30             : int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key,
      31             :                           u64 value, bool reusable);
      32             : void __mb_cache_entry_free(struct mb_cache_entry *entry);
      33           0 : static inline int mb_cache_entry_put(struct mb_cache *cache,
      34             :                                      struct mb_cache_entry *entry)
      35             : {
      36           0 :         if (!atomic_dec_and_test(&entry->e_refcnt))
      37             :                 return 0;
      38           0 :         __mb_cache_entry_free(entry);
      39           0 :         return 1;
      40             : }
      41             : 
      42             : void mb_cache_entry_delete(struct mb_cache *cache, u32 key, u64 value);
      43             : struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key,
      44             :                                           u64 value);
      45             : struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
      46             :                                                  u32 key);
      47             : struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache *cache,
      48             :                                                 struct mb_cache_entry *entry);
      49             : void mb_cache_entry_touch(struct mb_cache *cache,
      50             :                           struct mb_cache_entry *entry);
      51             : 
      52             : #endif  /* _LINUX_MBCACHE_H */

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