Enable RCU protected lookup in the legacy DNS resolver.
Signed-off-by: Trond Myklebust <trond.myklebust@xxxxxxxxxxxxxxx>
---
fs/nfs/dns_resolve.c | 15 ++++++++++++---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/dns_resolve.c b/fs/nfs/dns_resolve.c
index 060c658eab66..e93a5dc07c8c 100644
--- a/fs/nfs/dns_resolve.c
+++ b/fs/nfs/dns_resolve.c
@@ -65,6 +65,7 @@ struct nfs_dns_ent {
struct sockaddr_storage addr;
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;
- 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);
}
+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)
{
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;
- ch = sunrpc_cache_lookup(cd,
+ ch = sunrpc_cache_lookup_rcu(cd,
&key->h,
nfs_dns_hash(key));
if (!ch)
--
2.17.1
