Merge tag 'nfs-for-3.11-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs

Pull NFS client updates from Trond Myklebust:
 "Feature highlights include:
   - Add basic client support for NFSv4.2
   - Add basic client support for Labeled NFS (selinux for NFSv4.2)
   - Fix the use of credentials in NFSv4.1 stateful operations, and add
     support for NFSv4.1 state protection.

  Bugfix highlights:
   - Fix another NFSv4 open state recovery race
   - Fix an NFSv4.1 back channel session regression
   - Various rpc_pipefs races
   - Fix another issue with NFSv3 auth negotiation

  Please note that Labeled NFS does require some additional support from
  the security subsystem.  The relevant changesets have all been
  reviewed and acked by James Morris."

* tag 'nfs-for-3.11-1' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: (54 commits)
  NFS: Set NFS_CS_MIGRATION for NFSv4 mounts
  NFSv4.1 Refactor nfs4_init_session and nfs4_init_channel_attrs
  nfs: have NFSv3 try server-specified auth flavors in turn
  nfs: have nfs_mount fake up a auth_flavs list when the server didn't provide it
  nfs: move server_authlist into nfs_try_mount_request
  nfs: refactor "need_mount" code out of nfs_try_mount
  SUNRPC: PipeFS MOUNT notification optimization for dying clients
  SUNRPC: split client creation routine into setup and registration
  SUNRPC: fix races on PipeFS UMOUNT notifications
  SUNRPC: fix races on PipeFS MOUNT notifications
  NFSv4.1 use pnfs_device maxcount for the objectlayout gdia_maxcount
  NFSv4.1 use pnfs_device maxcount for the blocklayout gdia_maxcount
  NFSv4.1 Fix gdia_maxcount calculation to fit in ca_maxresponsesize
  NFS: Improve legacy idmapping fallback
  NFSv4.1 end back channel session draining
  NFS: Apply v4.1 capabilities to v4.2
  NFSv4.1: Clean up layout segment comparison helper names
  NFSv4.1: layout segment comparison helpers should take 'const' parameters
  NFSv4: Move the DNS resolver into the NFSv4 module
  rpc_pipefs: only set rpc_dentry_ops if d_op isn't already set
  ...

1 files changed, 6 insertions, 2 deletions

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index e7ce4b3eb0bd..4679df5a6d50 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -667,7 +667,8 @@ static struct dentry *__rpc_lookup_create_exclusive(struct dentry *parent,
                         return ERR_PTR(-ENOMEM);
         }
         if (dentry->d_inode == NULL) {
-                d_set_d_op(dentry, &rpc_dentry_operations);
+                if (!dentry->d_op)
+                        d_set_d_op(dentry, &rpc_dentry_operations);
                 return dentry;
         }
         dput(dentry);
@@ -1126,6 +1127,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent)
                 return -ENOMEM;
         dprintk("RPC:       sending pipefs MOUNT notification for net %p%s\n",
                 net, NET_NAME(net));
+        mutex_lock(&sn->pipefs_sb_lock);
         sn->pipefs_sb = sb;
         err = blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
                                            RPC_PIPEFS_MOUNT,
@@ -1133,6 +1135,7 @@ rpc_fill_super(struct super_block *sb, void *data, int silent)
         if (err)
                 goto err_depopulate;
         sb->s_fs_info = get_net(net);
+        mutex_unlock(&sn->pipefs_sb_lock);
         return 0;
 
 err_depopulate:
@@ -1141,6 +1144,7 @@ err_depopulate:
                                            sb);
         sn->pipefs_sb = NULL;
         __rpc_depopulate(root, files, RPCAUTH_lockd, RPCAUTH_RootEOF);
+        mutex_unlock(&sn->pipefs_sb_lock);
         return err;
 }
 
@@ -1162,12 +1166,12 @@ static void rpc_kill_sb(struct super_block *sb)
                 goto out;
         }
         sn->pipefs_sb = NULL;
-        mutex_unlock(&sn->pipefs_sb_lock);
         dprintk("RPC:       sending pipefs UMOUNT notification for net %p%s\n",
                 net, NET_NAME(net));
         blocking_notifier_call_chain(&rpc_pipefs_notifier_list,
                                            RPC_PIPEFS_UMOUNT,
                                            sb);
+        mutex_unlock(&sn->pipefs_sb_lock);
         put_net(net);
 out:
         kill_litter_super(sb);