NFS: make cb_ident_idr per net ns

This patch makes ID's infrastructure network namespace aware. This was done
mainly because of nfs_client_lock, which is desired to be per network
namespace, but protects NFS clients ID's.

NOTE: NFS client's net pointer have to be set prior to ID initialization,
proper assignment was moved.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

5 files changed, 25 insertions, 14 deletions

diff --git a/fs/nfs/callback_xdr.c b/fs/nfs/callback_xdr.c
index 2f45aa717423..e14af46bd2c6 100644
--- a/fs/nfs/callback_xdr.c
+++ b/fs/nfs/callback_xdr.c
@@ -876,7 +876,7 @@ static __be32 nfs4_callback_compound(struct svc_rqst *rqstp, void *argp, void *r
                 return rpc_garbage_args;
 
         if (hdr_arg.minorversion == 0) {
-                cps.clp = nfs4_find_client_ident(hdr_arg.cb_ident);
+                cps.clp = nfs4_find_client_ident(rqstp->rq_xprt->xpt_net, hdr_arg.cb_ident);
                 if (!cps.clp || !check_gss_callback_principal(cps.clp, rqstp))
                         return rpc_drop_reply;
         }
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index d58e8386e6bc..f51b2795ce07 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -58,7 +58,6 @@
 DEFINE_SPINLOCK(nfs_client_lock);
 static DECLARE_WAIT_QUEUE_HEAD(nfs_client_active_wq);
 #ifdef CONFIG_NFS_V4
-static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */
 
 /*
  * Get a unique NFSv4.0 callback identifier which will be used
@@ -67,14 +66,15 @@ static DEFINE_IDR(cb_ident_idr); /* Protected by nfs_client_lock */
 static int nfs_get_cb_ident_idr(struct nfs_client *clp, int minorversion)
 {
         int ret = 0;
+        struct nfs_net *nn = net_generic(clp->net, nfs_net_id);
 
         if (clp->rpc_ops->version != 4 || minorversion != 0)
                 return ret;
 retry:
-        if (!idr_pre_get(&cb_ident_idr, GFP_KERNEL))
+        if (!idr_pre_get(&nn->cb_ident_idr, GFP_KERNEL))
                 return -ENOMEM;
         spin_lock(&nfs_client_lock);
-        ret = idr_get_new(&cb_ident_idr, clp, &clp->cl_cb_ident);
+        ret = idr_get_new(&nn->cb_ident_idr, clp, &clp->cl_cb_ident);
         spin_unlock(&nfs_client_lock);
         if (ret == -EAGAIN)
                 goto retry;
@@ -173,6 +173,7 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
         clp->cl_rpcclient = ERR_PTR(-EINVAL);
 
         clp->cl_proto = cl_init->proto;
+        clp->net = cl_init->net;
 
 #ifdef CONFIG_NFS_V4
         err = nfs_get_cb_ident_idr(clp, cl_init->minorversion);
@@ -191,7 +192,6 @@ static struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_
         if (!IS_ERR(cred))
                 clp->cl_machine_cred = cred;
         nfs_fscache_get_client_cookie(clp);
-        clp->net = cl_init->net;
 
         return clp;
 
@@ -236,16 +236,20 @@ static void nfs4_shutdown_client(struct nfs_client *clp)
 }
 
 /* idr_remove_all is not needed as all id's are removed by nfs_put_client */
-void nfs_cleanup_cb_ident_idr(void)
+void nfs_cleanup_cb_ident_idr(struct net *net)
 {
-        idr_destroy(&cb_ident_idr);
+        struct nfs_net *nn = net_generic(net, nfs_net_id);
+
+        idr_destroy(&nn->cb_ident_idr);
 }
 
 /* nfs_client_lock held */
 static void nfs_cb_idr_remove_locked(struct nfs_client *clp)
 {
+        struct nfs_net *nn = net_generic(clp->net, nfs_net_id);
+
         if (clp->cl_cb_ident)
-                idr_remove(&cb_ident_idr, clp->cl_cb_ident);
+                idr_remove(&nn->cb_ident_idr, clp->cl_cb_ident);
 }
 
 static void pnfs_init_server(struct nfs_server *server)
@@ -263,7 +267,7 @@ static void nfs4_shutdown_client(struct nfs_client *clp)
 {
 }
 
-void nfs_cleanup_cb_ident_idr(void)
+void nfs_cleanup_cb_ident_idr(struct net *net)
 {
 }
 
@@ -1203,12 +1207,13 @@ error:
  * Find a client by callback identifier
  */
 struct nfs_client *
-nfs4_find_client_ident(int cb_ident)
+nfs4_find_client_ident(struct net *net, int cb_ident)
 {
         struct nfs_client *clp;
+        struct nfs_net *nn = net_generic(net, nfs_net_id);
 
         spin_lock(&nfs_client_lock);
-        clp = idr_find(&cb_ident_idr, cb_ident);
+        clp = idr_find(&nn->cb_ident_idr, cb_ident);
         if (clp)
                 atomic_inc(&clp->cl_count);
         spin_unlock(&nfs_client_lock);
@@ -1765,6 +1770,9 @@ void nfs_clients_init(struct net *net)
 
         INIT_LIST_HEAD(&nn->nfs_client_list);
         INIT_LIST_HEAD(&nn->nfs_volume_list);
+#ifdef CONFIG_NFS_V4
+        idr_init(&nn->cb_ident_idr);
+#endif
 }
 
 #ifdef CONFIG_PROC_FS
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 0365b84cc2c7..6c662598f885 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1565,6 +1565,7 @@ static int nfs_net_init(struct net *net)
 static void nfs_net_exit(struct net *net)
 {
         nfs_dns_resolver_cache_destroy(net);
+        nfs_cleanup_cb_ident_idr(net);
 }
 
 static struct pernet_operations nfs_net_ops = {
@@ -1674,7 +1675,6 @@ static void __exit exit_nfs_fs(void)
 #ifdef CONFIG_PROC_FS
         rpc_proc_unregister(&init_net, "nfs");
 #endif
-        nfs_cleanup_cb_ident_idr();
         unregister_nfs_fs();
         nfs_fs_proc_exit();
         nfsiod_stop();
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index a9ae8069fff9..958fff2927c0 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -148,9 +148,9 @@ extern void nfs_umount(const struct nfs_mount_request *info);
 extern const struct rpc_program nfs_program;
 extern void nfs_clients_init(struct net *net);
 
-extern void nfs_cleanup_cb_ident_idr(void);
+extern void nfs_cleanup_cb_ident_idr(struct net *);
 extern void nfs_put_client(struct nfs_client *);
-extern struct nfs_client *nfs4_find_client_ident(int);
+extern struct nfs_client *nfs4_find_client_ident(struct net *, int);
 extern struct nfs_client *
 nfs4_find_client_sessionid(const struct sockaddr *, struct nfs4_sessionid *);
 extern struct nfs_server *nfs_create_server(
diff --git a/fs/nfs/netns.h b/fs/nfs/netns.h
index 0fbd4e017d27..547cc9525ba2 100644
--- a/fs/nfs/netns.h
+++ b/fs/nfs/netns.h
@@ -9,6 +9,9 @@ struct nfs_net {
         struct rpc_pipe *bl_device_pipe;
         struct list_head nfs_client_list;
         struct list_head nfs_volume_list;
+#ifdef CONFIG_NFS_V4
+        struct idr cb_ident_idr; /* Protected by nfs_client_lock */
+#endif
 };
 
 extern int nfs_net_id;