linux-ext4 - [PATCH 09/10] mbcache: Remove mb_cache_entry

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Date:   Tue, 14 Jun 2022 18:05:23 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>,
        Ritesh Harjani <ritesh.list@...il.com>, Jan Kara <jack@...e.cz>
Subject: [PATCH 09/10] mbcache: Remove mb_cache_entry_delete()

Nobody uses mb_cache_entry_delete() anymore. Remove it.

Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/mbcache.c            | 41 ++---------------------------------------
 include/linux/mbcache.h |  1 -
 2 files changed, 2 insertions(+), 40 deletions(-)

diff --git a/fs/mbcache.c b/fs/mbcache.c
index 1ae66b2c75f4..c7b28a4e96da 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -11,7 +11,7 @@
 /*
  * Mbcache is a simple key-value store. Keys need not be unique, however
  * key-value pairs are expected to be unique (we use this fact in
- * mb_cache_entry_delete()).
+ * mb_cache_entry_try_delete()).
  *
  * Ext2 and ext4 use this cache for deduplication of extended attribute blocks.
  * Ext4 also uses it for deduplication of xattr values stored in inodes.
@@ -230,44 +230,7 @@ struct mb_cache_entry *mb_cache_entry_get(struct mb_cache *cache, u32 key,
 }
 EXPORT_SYMBOL(mb_cache_entry_get);
 
-/* mb_cache_entry_delete - try to remove a cache entry
- * @cache - cache we work with
- * @key - key
- * @value - value
- *
- * Remove entry from cache @cache with key @key and value @value.
- */
-void mb_cache_entry_delete(struct mb_cache *cache, u32 key, u64 value)
-{
-	struct hlist_bl_node *node;
-	struct hlist_bl_head *head;
-	struct mb_cache_entry *entry;
-
-	head = mb_cache_entry_head(cache, key);
-	hlist_bl_lock(head);
-	hlist_bl_for_each_entry(entry, node, head, e_hash_list) {
-		if (entry->e_key == key && entry->e_value == value) {
-			/* We keep hash list reference to keep entry alive */
-			hlist_bl_del_init(&entry->e_hash_list);
-			hlist_bl_unlock(head);
-			spin_lock(&cache->c_list_lock);
-			if (!list_empty(&entry->e_list)) {
-				list_del_init(&entry->e_list);
-				if (!WARN_ONCE(cache->c_entry_count == 0,
-		"mbcache: attempt to decrement c_entry_count past zero"))
-					cache->c_entry_count--;
-				atomic_dec(&entry->e_refcnt);
-			}
-			spin_unlock(&cache->c_list_lock);
-			mb_cache_entry_put(cache, entry);
-			return;
-		}
-	}
-	hlist_bl_unlock(head);
-}
-EXPORT_SYMBOL(mb_cache_entry_delete);
-
-/* mb_cache_entry_try_delete - try to remove a cache entry
+/* mb_cache_entry_try_delete - remove a cache entry
  * @cache - cache we work with
  * @key - key
  * @value - value
diff --git a/include/linux/mbcache.h b/include/linux/mbcache.h
index 1176fdfb8d53..3b25c3004ea9 100644
--- a/include/linux/mbcache.h
+++ b/include/linux/mbcache.h
@@ -47,7 +47,6 @@ static inline int mb_cache_entry_put(struct mb_cache *cache,
 
 struct mb_cache_entry *mb_cache_entry_try_delete(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);
 struct mb_cache_entry *mb_cache_entry_find_first(struct mb_cache *cache,
-- 
2.35.3