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Diffstat (limited to 'net/sunrpc/rpc_pipe.c')
-rw-r--r--net/sunrpc/rpc_pipe.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index e5e1f357b561..f075f8817773 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -1023,6 +1023,40 @@ struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
}
EXPORT_SYMBOL_GPL(rpc_d_lookup_sb);
+void rpc_pipefs_init_net(struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+ mutex_init(&sn->pipefs_sb_lock);
+}
+
+/*
+ * This call will be used for per network namespace operations calls.
+ * Note: Function will be returned with pipefs_sb_lock taken if superblock was
+ * found. This lock have to be released by rpc_put_sb_net() when all operations
+ * will be completed.
+ */
+struct super_block *rpc_get_sb_net(const struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+ mutex_lock(&sn->pipefs_sb_lock);
+ if (sn->pipefs_sb)
+ return sn->pipefs_sb;
+ mutex_unlock(&sn->pipefs_sb_lock);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(rpc_get_sb_net);
+
+void rpc_put_sb_net(const struct net *net)
+{
+ struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+ BUG_ON(sn->pipefs_sb == NULL);
+ mutex_unlock(&sn->pipefs_sb_lock);
+}
+EXPORT_SYMBOL_GPL(rpc_put_sb_net);
+
static int
rpc_fill_super(struct super_block *sb, void *data, int silent)
{
@@ -1077,7 +1111,9 @@ void rpc_kill_sb(struct super_block *sb)
struct net *net = sb->s_fs_info;
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+ mutex_lock(&sn->pipefs_sb_lock);
sn->pipefs_sb = NULL;
+ mutex_unlock(&sn->pipefs_sb_lock);
put_net(net);
blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
RPC_PIPEFS_UMOUNT,