NFS: Lockless DNS lookups (437f9145) · Commits · 戴 / test

fs/nfs/dns_resolve.c

+12 −3

Original line number	Original line	Diff line number	Diff line
	@@ -65,6 +65,7 @@ struct nfs_dns_ent {

	struct sockaddr_storage addr;		struct sockaddr_storage addr;
	size_t addrlen;		size_t addrlen;
			struct rcu_head rcu_head;
	};		};


	@@ -101,15 +102,23 @@ static void nfs_dns_ent_init(struct cache_head *cnew,
	}		}
	}		}

	static void nfs_dns_ent_put(struct kref *ref)		static void nfs_dns_ent_free_rcu(struct rcu_head *head)
	{		{
	struct nfs_dns_ent *item;		struct nfs_dns_ent *item;

	item = container_of(ref, struct nfs_dns_ent, h.ref);		item = container_of(head, struct nfs_dns_ent, rcu_head);
	kfree(item->hostname);		kfree(item->hostname);
	kfree(item);		kfree(item);
	}		}

			static void nfs_dns_ent_put(struct kref *ref)
			{
			struct nfs_dns_ent *item;

			item = container_of(ref, struct nfs_dns_ent, h.ref);
			call_rcu(item, nfs_dns_ent_free_rcu);
			}

	static struct cache_head *nfs_dns_ent_alloc(void)		static struct cache_head *nfs_dns_ent_alloc(void)
	{		{
	struct nfs_dns_ent item = kmalloc(sizeof(item), GFP_KERNEL);		struct nfs_dns_ent item = kmalloc(sizeof(item), GFP_KERNEL);
	@@ -195,7 +204,7 @@ static struct nfs_dns_ent nfs_dns_lookup(struct cache_detail cd,
	{		{
	struct cache_head *ch;		struct cache_head *ch;

	ch = sunrpc_cache_lookup(cd,		ch = sunrpc_cache_lookup_rcu(cd,
	&key->h,		&key->h,
	nfs_dns_hash(key));		nfs_dns_hash(key));
	if (!ch)		if (!ch)