sunrpc: create a new dummy pipe for gssd to hold open

rpc.gssd will naturally hold open any pipe named */clnt*/gssd that shows
up under rpc_pipefs. That behavior gives us a reliable mechanism to tell
whether it's actually running or not.

Create a new toplevel "gssd" directory in rpc_pipefs when it's mounted.
Under that directory create another directory called "clntXX", and then
within that a pipe called "gssd".

We'll never send an upcall along that pipe, and any downcall written to
it will just return -EINVAL.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

diff --git a/include/linux/sunrpc/rpc_pipe_fs.h b/include/linux/sunrpc/rpc_pipe_fs.h
index a353e03..85f1342 100644 (file)
--- a/include/linux/sunrpc/rpc_pipe_fs.h
+++ b/include/linux/sunrpc/rpc_pipe_fs.h
@@ -84,7 +84,8 @@ enum {
 
 extern struct dentry *rpc_d_lookup_sb(const struct super_block *sb,
                                      const unsigned char *dir_name);
-extern void rpc_pipefs_init_net(struct net *net);
+extern int rpc_pipefs_init_net(struct net *net);
+extern void rpc_pipefs_exit_net(struct net *net);
 extern struct super_block *rpc_get_sb_net(const struct net *net);
 extern void rpc_put_sb_net(const struct net *net);
 

diff --git a/net/sunrpc/netns.h b/net/sunrpc/netns.h
index 779742c..8a8e841 100644 (file)
--- a/net/sunrpc/netns.h
+++ b/net/sunrpc/netns.h
@@ -14,6 +14,7 @@ struct sunrpc_net {
        struct cache_detail *rsi_cache;
 
        struct super_block *pipefs_sb;
+       struct rpc_pipe *gssd_dummy;
        struct mutex pipefs_sb_lock;
 
        struct list_head all_clients;

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index bf04b30..c23458b 100644 (file)
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -38,7 +38,7 @@
 #define NET_NAME(net)  ((net == &init_net) ? " (init_net)" : "")
 
 static struct file_system_type rpc_pipe_fs_type;
-
+static const struct rpc_pipe_ops gssd_dummy_pipe_ops;
 
 static struct kmem_cache *rpc_inode_cachep __read_mostly;
 
@@ -1159,6 +1159,7 @@ enum {
        RPCAUTH_nfsd4_cb,
        RPCAUTH_cache,
        RPCAUTH_nfsd,
+       RPCAUTH_gssd,
        RPCAUTH_RootEOF
 };
 
@@ -1195,6 +1196,10 @@ static const struct rpc_filelist files[] = {
                .name = "nfsd",
                .mode = S_IFDIR | S_IRUGO | S_IXUGO,
        },
+       [RPCAUTH_gssd] = {
+               .name = "gssd",
+               .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+       },
 };
 
 /*
@@ -1208,13 +1213,25 @@ 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)
+int rpc_pipefs_init_net(struct net *net)
 {
        struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
 
+       sn->gssd_dummy = rpc_mkpipe_data(&gssd_dummy_pipe_ops, 0);
+       if (IS_ERR(sn->gssd_dummy))
+               return PTR_ERR(sn->gssd_dummy);
+
        mutex_init(&sn->pipefs_sb_lock);
        sn->gssd_running = 1;
        sn->pipe_version = -1;
+       return 0;
+}
+
+void rpc_pipefs_exit_net(struct net *net)
+{
+       struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
+
+       rpc_destroy_pipe_data(sn->gssd_dummy);
 }
 
 /*
@@ -1244,11 +1261,73 @@ void rpc_put_sb_net(const struct net *net)
 }
 EXPORT_SYMBOL_GPL(rpc_put_sb_net);
 
+static const struct rpc_filelist gssd_dummy_clnt_dir[] = {
+       [0] = {
+               .name = "clntXX",
+               .mode = S_IFDIR | S_IRUGO | S_IXUGO,
+       },
+};
+
+static ssize_t
+dummy_downcall(struct file *filp, const char __user *src, size_t len)
+{
+       return -EINVAL;
+}
+
+static const struct rpc_pipe_ops gssd_dummy_pipe_ops = {
+       .upcall         = rpc_pipe_generic_upcall,
+       .downcall       = dummy_downcall,
+};
+
+/**
+ * rpc_gssd_dummy_populate - create a dummy gssd pipe
+ * @root:      root of the rpc_pipefs filesystem
+ * @pipe_data: pipe data created when netns is initialized
+ *
+ * Create a dummy set of directories and a pipe that gssd can hold open to
+ * indicate that it is up and running.
+ */
+static struct dentry *
+rpc_gssd_dummy_populate(struct dentry *root, struct rpc_pipe *pipe_data)
+{
+       int ret = 0;
+       struct dentry *gssd_dentry;
+       struct dentry *clnt_dentry = NULL;
+       struct dentry *pipe_dentry = NULL;
+       struct qstr q = QSTR_INIT(files[RPCAUTH_gssd].name,
+                                 strlen(files[RPCAUTH_gssd].name));
+
+       /* We should never get this far if "gssd" doesn't exist */
+       gssd_dentry = d_hash_and_lookup(root, &q);
+       if (!gssd_dentry)
+               return ERR_PTR(-ENOENT);
+
+       ret = rpc_populate(gssd_dentry, gssd_dummy_clnt_dir, 0, 1, NULL);
+       if (ret) {
+               pipe_dentry = ERR_PTR(ret);
+               goto out;
+       }
+
+       q.name = gssd_dummy_clnt_dir[0].name;
+       q.len = strlen(gssd_dummy_clnt_dir[0].name);
+       clnt_dentry = d_hash_and_lookup(gssd_dentry, &q);
+       if (!clnt_dentry) {
+               pipe_dentry = ERR_PTR(-ENOENT);
+               goto out;
+       }
+
+       pipe_dentry = rpc_mkpipe_dentry(clnt_dentry, "gssd", NULL, pipe_data);
+out:
+       dput(clnt_dentry);
+       dput(gssd_dentry);
+       return pipe_dentry;
+}
+
 static int
 rpc_fill_super(struct super_block *sb, void *data, int silent)
 {
        struct inode *inode;
-       struct dentry *root;
+       struct dentry *root, *gssd_dentry;
        struct net *net = data;
        struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
        int err;
@@ -1266,6 +1345,13 @@ rpc_fill_super(struct super_block *sb, void *data, int silent)
                return -ENOMEM;
        if (rpc_populate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF, NULL))
                return -ENOMEM;
+
+       gssd_dentry = rpc_gssd_dummy_populate(root, sn->gssd_dummy);
+       if (IS_ERR(gssd_dentry)) {
+               __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
+               return PTR_ERR(gssd_dentry);
+       }
+
        dprintk("RPC:       sending pipefs MOUNT notification for net %p%s\n",
                net, NET_NAME(net));
        mutex_lock(&sn->pipefs_sb_lock);
@@ -1280,6 +1366,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent)
        return 0;
 
 err_depopulate:
+       dput(gssd_dentry);
        blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
                                           RPC_PIPEFS_UMOUNT,
                                           sb);

diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
index 3d6498a..cd30120 100644 (file)
--- a/net/sunrpc/sunrpc_syms.c
+++ b/net/sunrpc/sunrpc_syms.c
@@ -44,12 +44,17 @@ static __net_init int sunrpc_init_net(struct net *net)
        if (err)
                goto err_unixgid;
 
-       rpc_pipefs_init_net(net);
+       err = rpc_pipefs_init_net(net);
+       if (err)
+               goto err_pipefs;
+
        INIT_LIST_HEAD(&sn->all_clients);
        spin_lock_init(&sn->rpc_client_lock);
        spin_lock_init(&sn->rpcb_clnt_lock);
        return 0;
 
+err_pipefs:
+       unix_gid_cache_destroy(net);
 err_unixgid:
        ip_map_cache_destroy(net);
 err_ipmap:
@@ -60,6 +65,7 @@ err_proc:
 
 static __net_exit void sunrpc_exit_net(struct net *net)
 {
+       rpc_pipefs_exit_net(net);
        unix_gid_cache_destroy(net);
        ip_map_cache_destroy(net);
        rpc_proc_exit(net);