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mbcache: add functions to delete entry if unused

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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>
This commit is contained in:
Jan Kara
2022-07-12 12:54:21 +02:00
committed by Theodore Ts'o
parent 5831891418
commit 3dc96bba65
2 changed files with 73 additions and 3 deletions
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10
include/linux/mbcache.h
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@@ -30,15 +30,23 @@ void mb_cache_destroy(struct mb_cache *cache);
int mb_cache_entry_create(struct mb_cache *cache, gfp_t mask, u32 key,
u64 value, bool reusable);
void __mb_cache_entry_free(struct mb_cache_entry *entry);
void mb_cache_entry_wait_unused(struct mb_cache_entry *entry);
static inline int mb_cache_entry_put(struct mb_cache *cache,
struct mb_cache_entry *entry)
{
if (!atomic_dec_and_test(&entry->e_refcnt))
unsigned int cnt = atomic_dec_return(&entry->e_refcnt);
if (cnt > 0) {
if (cnt <= 3)
wake_up_var(&entry->e_refcnt);
return 0;
}
__mb_cache_entry_free(entry);
return 1;
}
struct mb_cache_entry *mb_cache_entry_delete_or_get(struct mb_cache *cache,
u32 key, u64 value);
void mb_cache_entry_delete(struct mb_cache *cache, u32 key, u64 value);
struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key,
u64 value);