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NFS: Lockless DNS lookups

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Enable RCU protected lookup in the legacy DNS resolver.

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 10:41:50 -04:00 committed by J. Bruce Fields
parent 9d5afd9491
commit 437f914513
1 changed files with 12 additions and 3 deletions
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15
fs/nfs/dns_resolve.c
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@ -65,6 +65,7 @@ struct nfs_dns_ent {
struct sockaddr_storage addr;
size_t addrlen;
struct rcu_head rcu_head;
};
@ -101,13 +102,21 @@ static void nfs_dns_ent_init(struct cache_head *cnew,
}
}
static void nfs_dns_ent_free_rcu(struct rcu_head *head)
{
struct nfs_dns_ent *item;
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);
kfree(item->hostname);
kfree(item);
call_rcu(item, nfs_dns_ent_free_rcu);
}
static struct cache_head *nfs_dns_ent_alloc(void)
@ -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)