SUNRPC: cache creation and destruction routines introduced

This patch prepares infrastructure for network namespace aware cache detail
allocation.
One note about adding network namespace link to cache structure. It's going to
be used later in NFS DNS cache parsing routine (nfs_dns_parse for rpc_pton()
call).

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

1 files changed, 26 insertions, 0 deletions

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index fefe06729f9d..a450b8ac648b 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1664,6 +1664,32 @@ void cache_unregister(struct cache_detail *cd)
 }
 EXPORT_SYMBOL_GPL(cache_unregister);
 
+struct cache_detail *cache_create_net(struct cache_detail *tmpl, struct net *net)
+{
+        struct cache_detail *cd;
+
+        cd = kmemdup(tmpl, sizeof(struct cache_detail), GFP_KERNEL);
+        if (cd == NULL)
+                return ERR_PTR(-ENOMEM);
+
+        cd->hash_table = kzalloc(cd->hash_size * sizeof(struct cache_head *),
+                                 GFP_KERNEL);
+        if (cd->hash_table == NULL) {
+                kfree(cd);
+                return ERR_PTR(-ENOMEM);
+        }
+        cd->net = net;
+        return cd;
+}
+EXPORT_SYMBOL_GPL(cache_create_net);
+
+void cache_destroy_net(struct cache_detail *cd, struct net *net)
+{
+        kfree(cd->hash_table);
+        kfree(cd);
+}
+EXPORT_SYMBOL_GPL(cache_destroy_net);
+
 static ssize_t cache_read_pipefs(struct file *filp, char __user *buf,
                                  size_t count, loff_t *ppos)
 {