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authorTrond Myklebust <trondmy@gmail.com>2020-01-06 13:40:35 -0500
committerJ. Bruce Fields <bfields@redhat.com>2020-01-22 16:25:41 -0500
commit809fe3c533789ebb51c1873b80c7dafbad9dbf19 (patch)
tree9fb6f44f790f58d9416a0403f8c1fa67d1695d30 /net/sunrpc
parent1d82163714c16ebe09c7a8c9cd3cef7abcc16208 (diff)
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sunrpc: clean up cache entry add/remove from hashtable
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/cache.c50
1 files changed, 26 insertions, 24 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 7ede1e52fd81..52d927210d32 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -77,6 +77,22 @@ static struct cache_head *sunrpc_cache_find_rcu(struct cache_detail *detail,
return NULL;
}
+static void sunrpc_begin_cache_remove_entry(struct cache_head *ch,
+ struct cache_detail *cd)
+{
+ /* Must be called under cd->hash_lock */
+ hlist_del_init_rcu(&ch->cache_list);
+ set_bit(CACHE_CLEANED, &ch->flags);
+ cd->entries --;
+}
+
+static void sunrpc_end_cache_remove_entry(struct cache_head *ch,
+ struct cache_detail *cd)
+{
+ cache_fresh_unlocked(ch, cd);
+ cache_put(ch, cd);
+}
+
static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail,
struct cache_head *key,
int hash)
@@ -100,8 +116,7 @@ static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail,
hlist_for_each_entry_rcu(tmp, head, cache_list) {
if (detail->match(tmp, key)) {
if (cache_is_expired(detail, tmp)) {
- hlist_del_init_rcu(&tmp->cache_list);
- detail->entries --;
+ sunrpc_begin_cache_remove_entry(tmp, detail);
freeme = tmp;
break;
}
@@ -117,10 +132,8 @@ static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail,
cache_get(new);
spin_unlock(&detail->hash_lock);
- if (freeme) {
- cache_fresh_unlocked(freeme, detail);
- cache_put(freeme, detail);
- }
+ if (freeme)
+ sunrpc_end_cache_remove_entry(freeme, detail);
return new;
}
@@ -454,8 +467,7 @@ static int cache_clean(void)
if (!cache_is_expired(current_detail, ch))
continue;
- hlist_del_init_rcu(&ch->cache_list);
- current_detail->entries--;
+ sunrpc_begin_cache_remove_entry(ch, current_detail);
rv = 1;
break;
}
@@ -465,11 +477,8 @@ static int cache_clean(void)
if (!ch)
current_index ++;
spin_unlock(&cache_list_lock);
- if (ch) {
- set_bit(CACHE_CLEANED, &ch->flags);
- cache_fresh_unlocked(ch, d);
- cache_put(ch, d);
- }
+ if (ch)
+ sunrpc_end_cache_remove_entry(ch, d);
} else
spin_unlock(&cache_list_lock);
@@ -525,13 +534,9 @@ void cache_purge(struct cache_detail *detail)
for (i = 0; i < detail->hash_size; i++) {
head = &detail->hash_table[i];
hlist_for_each_entry_safe(ch, tmp, head, cache_list) {
- hlist_del_init_rcu(&ch->cache_list);
- detail->entries--;
-
- set_bit(CACHE_CLEANED, &ch->flags);
+ sunrpc_begin_cache_remove_entry(ch, detail);
spin_unlock(&detail->hash_lock);
- cache_fresh_unlocked(ch, detail);
- cache_put(ch, detail);
+ sunrpc_end_cache_remove_entry(ch, detail);
spin_lock(&detail->hash_lock);
}
}
@@ -1886,12 +1891,9 @@ void sunrpc_cache_unhash(struct cache_detail *cd, struct cache_head *h)
{
spin_lock(&cd->hash_lock);
if (!hlist_unhashed(&h->cache_list)){
- hlist_del_init_rcu(&h->cache_list);
- cd->entries--;
- set_bit(CACHE_CLEANED, &h->flags);
+ sunrpc_begin_cache_remove_entry(h, cd);
spin_unlock(&cd->hash_lock);
- cache_fresh_unlocked(h, cd);
- cache_put(h, cd);
+ sunrpc_end_cache_remove_entry(h, cd);
} else
spin_unlock(&cd->hash_lock);
}