NFS: remove RPC PipeFS mount point references from NFS cache routines

This is a cleanup patch. We don't need this reference anymore, because DNS
resolver cache now creates it's dentries in per-net operations and on PipeFS
mount/umount notification.
Note that nfs_cache_register_net() now returns 0 instead of -ENOENT in case of
PiepFS superblock absence. This is ok, Dns resolver cache will be regestered on
PipeFS mount event.

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

1 files changed, 4 insertions, 15 deletions

diff --git a/fs/nfs/cache_lib.c b/fs/nfs/cache_lib.c
index 5905a31211e5..dded26368111 100644
--- a/fs/nfs/cache_lib.c
+++ b/fs/nfs/cache_lib.c
@@ -126,24 +126,14 @@ int nfs_cache_register_sb(struct super_block *sb, struct cache_detail *cd)
 
 int nfs_cache_register_net(struct net *net, struct cache_detail *cd)
 {
-        struct vfsmount *mnt;
         struct super_block *pipefs_sb;
-        int ret;
+        int ret = 0;
 
-        mnt = rpc_get_mount();
-        if (IS_ERR(mnt))
-                return PTR_ERR(mnt);
         pipefs_sb = rpc_get_sb_net(net);
-        if (!pipefs_sb) {
-                ret = -ENOENT;
-                goto err;
+        if (pipefs_sb) {
+                ret = nfs_cache_register_sb(pipefs_sb, cd);
+                rpc_put_sb_net(net);
         }
-        ret = nfs_cache_register_sb(pipefs_sb, cd);
-        rpc_put_sb_net(net);
-        if (!ret)
-                return ret;
-err:
-        rpc_put_mount();
         return ret;
 }
 
@@ -162,7 +152,6 @@ void nfs_cache_unregister_net(struct net *net, struct cache_detail *cd)
                 nfs_cache_unregister_sb(pipefs_sb, cd);
                 rpc_put_sb_net(net);
         }
-        rpc_put_mount();
 }
 
 void nfs_cache_init(struct cache_detail *cd)