NFS: use SUNRPC cache creation and destruction helper for DNS cache

This cache was the first containerized and doesn't use net-aware cache
creation and destruction helpers.
This is a cleanup patch which just makes code looks clearer and reduce amount
of lines of code.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

diff --git a/fs/nfs/dns_resolve.c b/fs/nfs/dns_resolve.c
index 62c8c412721979a5499759018d0288f17cee9ead..d5ce5f4f0f5f4003252fd322bf98e093584cbe43 100644 (file)
--- a/fs/nfs/dns_resolve.c
+++ b/fs/nfs/dns_resolve.c
@@ -353,48 +353,39 @@ ssize_t nfs_dns_resolve_name(struct net *net, char *name,
 }
 EXPORT_SYMBOL_GPL(nfs_dns_resolve_name);
 
+static struct cache_detail nfs_dns_resolve_template = {
+       .owner          = THIS_MODULE,
+       .hash_size      = NFS_DNS_HASHTBL_SIZE,
+       .name           = "dns_resolve",
+       .cache_put      = nfs_dns_ent_put,
+       .cache_upcall   = nfs_dns_upcall,
+       .cache_parse    = nfs_dns_parse,
+       .cache_show     = nfs_dns_show,
+       .match          = nfs_dns_match,
+       .init           = nfs_dns_ent_init,
+       .update         = nfs_dns_ent_update,
+       .alloc          = nfs_dns_ent_alloc,
+};
+
+
 int nfs_dns_resolver_cache_init(struct net *net)
 {
-       int err = -ENOMEM;
+       int err;
        struct nfs_net *nn = net_generic(net, nfs_net_id);
-       struct cache_detail *cd;
-       struct cache_head **tbl;
 
-       cd = kzalloc(sizeof(struct cache_detail), GFP_KERNEL);
-       if (cd == NULL)
-               goto err_cd;
-
-       tbl = kzalloc(NFS_DNS_HASHTBL_SIZE * sizeof(struct cache_head *),
-                       GFP_KERNEL);
-       if (tbl == NULL)
-               goto err_tbl;
-
-       cd->owner = THIS_MODULE,
-       cd->hash_size = NFS_DNS_HASHTBL_SIZE,
-       cd->hash_table = tbl,
-       cd->name = "dns_resolve",
-       cd->cache_put = nfs_dns_ent_put,
-       cd->cache_upcall = nfs_dns_upcall,
-       cd->cache_parse = nfs_dns_parse,
-       cd->cache_show = nfs_dns_show,
-       cd->match = nfs_dns_match,
-       cd->init = nfs_dns_ent_init,
-       cd->update = nfs_dns_ent_update,
-       cd->alloc = nfs_dns_ent_alloc,
-
-       nfs_cache_init(cd);
-       err = nfs_cache_register_net(net, cd);
+       nn->nfs_dns_resolve = cache_create_net(&nfs_dns_resolve_template, net);
+       if (IS_ERR(nn->nfs_dns_resolve))
+               return PTR_ERR(nn->nfs_dns_resolve);
+
+       nfs_cache_init(nn->nfs_dns_resolve);
+       err = nfs_cache_register_net(net, nn->nfs_dns_resolve);
        if (err)
                goto err_reg;
-       nn->nfs_dns_resolve = cd;
        return 0;
 
 err_reg:
-       nfs_cache_destroy(cd);
-       kfree(cd->hash_table);
-err_tbl:
-       kfree(cd);
-err_cd:
+       nfs_cache_destroy(nn->nfs_dns_resolve);
+       cache_destroy_net(nn->nfs_dns_resolve, net);
        return err;
 }
 
@@ -405,8 +396,7 @@ void nfs_dns_resolver_cache_destroy(struct net *net)
 
        nfs_cache_unregister_net(net, cd);
        nfs_cache_destroy(cd);
-       kfree(cd->hash_table);
-       kfree(cd);
+       cache_destroy_net(nn->nfs_dns_resolve, net);
 }
 
 static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,