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3dc96bba65
Add function mb_cache_entry_delete_or_get() to delete mbcache entry if
it is unused and also add a function to wait for entry to become unused
- mb_cache_entry_wait_unused(). We do not share code between the two
deleting function as one of them will go away soon.
CC: stable@vger.kernel.org
Fixes: 82939d7999 ("ext4: convert to mbcache2")
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20220712105436.32204-2-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_MBCACHE_H
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#define _LINUX_MBCACHE_H
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#include <linux/hash.h>
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#include <linux/list_bl.h>
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#include <linux/list.h>
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#include <linux/atomic.h>
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#include <linux/fs.h>
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struct mb_cache;
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struct mb_cache_entry {
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/* List of entries in cache - protected by cache->c_list_lock */
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struct list_head e_list;
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/* Hash table list - protected by hash chain bitlock */
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struct hlist_bl_node e_hash_list;
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atomic_t e_refcnt;
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/* Key in hash - stable during lifetime of the entry */
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u32 e_key;
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u32 e_referenced:1;
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u32 e_reusable:1;
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/* User provided value - stable during lifetime of the entry */
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u64 e_value;
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};
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struct mb_cache *mb_cache_create(int bucket_bits);
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void mb_cache_destroy(struct mb_cache *cache);
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int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key,
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u64 value, bool reusable);
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void __mb_cache_entry_free(struct mb_cache_entry *entry);
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void mb_cache_entry_wait_unused(struct mb_cache_entry *entry);
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static inline int mb_cache_entry_put(struct mb_cache *cache,
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struct mb_cache_entry *entry)
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{
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unsigned int cnt = atomic_dec_return(&entry->e_refcnt);
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if (cnt > 0) {
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if (cnt <= 3)
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wake_up_var(&entry->e_refcnt);
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return 0;
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}
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__mb_cache_entry_free(entry);
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return 1;
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}
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struct mb_cache_entry *mb_cache_entry_delete_or_get(struct mb_cache *cache,
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u32 key, u64 value);
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void mb_cache_entry_delete(struct mb_cache *cache, u32 key, u64 value);
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struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key,
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u64 value);
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struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
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u32 key);
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struct mb_cache_entry *mb_cache_entry_find_next(struct mb_cache *cache,
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struct mb_cache_entry *entry);
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void mb_cache_entry_touch(struct mb_cache *cache,
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struct mb_cache_entry *entry);
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#endif /* _LINUX_MBCACHE_H */
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