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SUNRPC: Remove non-RCU protected lookup

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Clean up the cache code by removing the non-RCU protected lookup.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust
2018-10-01 10:41:51 -04:00
zatwierdzone przez J. Bruce Fields
rodzic a6482733bc
commit d48cf356a1
3 zmienionych plików z 7 dodań i 66 usunięć
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61
net/sunrpc/cache.c
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@@ -75,27 +75,6 @@ static struct cache_head *sunrpc_cache_find_rcu(struct cache_detail *detail,
return NULL;
}
static struct cache_head *sunrpc_cache_find(struct cache_detail *detail,
struct cache_head *key, int hash)
{
struct hlist_head *head = &detail->hash_table[hash];
struct cache_head *tmp;
read_lock(&detail->hash_lock);
hlist_for_each_entry(tmp, head, cache_list) {
if (detail->match(tmp, key)) {
if (cache_is_expired(detail, tmp))
/* This entry is expired, we will discard it. */
break;
cache_get(tmp);
read_unlock(&detail->hash_lock);
return tmp;
}
}
read_unlock(&detail->hash_lock);
return NULL;
}
static struct cache_head *sunrpc_cache_add_entry(struct cache_detail *detail,
struct cache_head *key,
int hash)
@@ -154,20 +133,6 @@ struct cache_head *sunrpc_cache_lookup_rcu(struct cache_detail *detail,
}
EXPORT_SYMBOL_GPL(sunrpc_cache_lookup_rcu);
struct cache_head *sunrpc_cache_lookup(struct cache_detail *detail,
struct cache_head *key, int hash)
{
struct cache_head *ret;
ret = sunrpc_cache_find(detail, key, hash);
if (ret)
return ret;
/* Didn't find anything, insert an empty entry */
return sunrpc_cache_add_entry(detail, key, hash);
}
EXPORT_SYMBOL_GPL(sunrpc_cache_lookup);
static void cache_dequeue(struct cache_detail *detail, struct cache_head *ch);
static void cache_fresh_locked(struct cache_head *head, time_t expiry,
@@ -1369,17 +1334,7 @@ static void *__cache_seq_start(struct seq_file *m, loff_t *pos)
struct cache_head, cache_list);
}
void *cache_seq_start(struct seq_file *m, loff_t *pos)
__acquires(cd->hash_lock)
{
struct cache_detail *cd = m->private;
read_lock(&cd->hash_lock);
return __cache_seq_start(m, pos);
}
EXPORT_SYMBOL_GPL(cache_seq_start);
void *cache_seq_next(struct seq_file *m, void *p, loff_t *pos)
static void *cache_seq_next(struct seq_file *m, void *p, loff_t *pos)
{
struct cache_head *ch = p;
int hash = (*pos >> 32);
@@ -1411,14 +1366,6 @@ void *cache_seq_next(struct seq_file *m, void *p, loff_t *pos)
}
EXPORT_SYMBOL_GPL(cache_seq_next);
void cache_seq_stop(struct seq_file *m, void *p)
__releases(cd->hash_lock)
{
struct cache_detail *cd = m->private;
read_unlock(&cd->hash_lock);
}
EXPORT_SYMBOL_GPL(cache_seq_stop);
void *cache_seq_start_rcu(struct seq_file *m, loff_t *pos)
__acquires(RCU)
{
@@ -1466,9 +1413,9 @@ static int c_show(struct seq_file *m, void *p)
}
static const struct seq_operations cache_content_op = {
.start = cache_seq_start,
.next = cache_seq_next,
.stop = cache_seq_stop,
.start = cache_seq_start_rcu,
.next = cache_seq_next_rcu,
.stop = cache_seq_stop_rcu,
.show = c_show,
};