Merge remote branch 'nouveau/drm-nouveau-next' of /ssd/git/drm-nouveau-next into...

[mv-sheeva.git] / fs / nfs / namespace.c

diff --git a/fs/nfs/namespace.c b/fs/nfs/namespace.c
index 74aaf3963c101ab1775e1efd3f544d0ac310273c..f32b8603dca8748f3480fd07d51b07069a0719d6 100644 (file)
--- a/fs/nfs/namespace.c
+++ b/fs/nfs/namespace.c
@@ -97,9 +97,8 @@ Elong:
 }
 
 /*
- * nfs_follow_mountpoint - handle crossing a mountpoint on the server
- * @dentry - dentry of mountpoint
- * @nd - nameidata info
+ * nfs_d_automount - Handle crossing a mountpoint on the server
+ * @path - The mountpoint
  *
  * When we encounter a mountpoint on the server, we want to set up
  * a mountpoint on the client too, to prevent inode numbers from
@@ -109,87 +108,65 @@ Elong:
  * situation, and that different filesystems may want to use
  * different security flavours.
  */
-static void * nfs_follow_mountpoint(struct dentry *dentry, struct nameidata *nd)
+struct vfsmount *nfs_d_automount(struct path *path)
 {
        struct vfsmount *mnt;
-       struct nfs_server *server = NFS_SERVER(dentry->d_inode);
+       struct nfs_server *server = NFS_SERVER(path->dentry->d_inode);
        struct dentry *parent;
        struct nfs_fh *fh = NULL;
        struct nfs_fattr *fattr = NULL;
        int err;
 
-       dprintk("--> nfs_follow_mountpoint()\n");
+       dprintk("--> nfs_d_automount()\n");
 
-       err = -ESTALE;
-       if (IS_ROOT(dentry))
-               goto out_err;
+       mnt = ERR_PTR(-ESTALE);
+       if (IS_ROOT(path->dentry))
+               goto out_nofree;
 
-       err = -ENOMEM;
+       mnt = ERR_PTR(-ENOMEM);
        fh = nfs_alloc_fhandle();
        fattr = nfs_alloc_fattr();
        if (fh == NULL || fattr == NULL)
-               goto out_err;
+               goto out;
 
        dprintk("%s: enter\n", __func__);
-       dput(nd->path.dentry);
-       nd->path.dentry = dget(dentry);
 
-       /* Look it up again */
-       parent = dget_parent(nd->path.dentry);
+       /* Look it up again to get its attributes */
+       parent = dget_parent(path->dentry);
        err = server->nfs_client->rpc_ops->lookup(parent->d_inode,
-                                                 &nd->path.dentry->d_name,
+                                                 &path->dentry->d_name,
                                                  fh, fattr);
        dput(parent);
-       if (err != 0)
-               goto out_err;
+       if (err != 0) {
+               mnt = ERR_PTR(err);
+               goto out;
+       }
 
        if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
-               mnt = nfs_do_refmount(nd->path.mnt, nd->path.dentry);
+               mnt = nfs_do_refmount(path->mnt, path->dentry);
        else
-               mnt = nfs_do_submount(nd->path.mnt, nd->path.dentry, fh,
-                                     fattr);
-       err = PTR_ERR(mnt);
+               mnt = nfs_do_submount(path->mnt, path->dentry, fh, fattr);
        if (IS_ERR(mnt))
-               goto out_err;
+               goto out;
 
-       mntget(mnt);
-       err = do_add_mount(mnt, &nd->path, nd->path.mnt->mnt_flags|MNT_SHRINKABLE,
-                          &nfs_automount_list);
-       if (err < 0) {
-               mntput(mnt);
-               if (err == -EBUSY)
-                       goto out_follow;
-               goto out_err;
-       }
-       path_put(&nd->path);
-       nd->path.mnt = mnt;
-       nd->path.dentry = dget(mnt->mnt_root);
+       dprintk("%s: done, success\n", __func__);
+       mntget(mnt); /* prevent immediate expiration */
+       mnt_set_expiry(mnt, &nfs_automount_list);
        schedule_delayed_work(&nfs_automount_task, nfs_mountpoint_expiry_timeout);
+
 out:
        nfs_free_fattr(fattr);
        nfs_free_fhandle(fh);
-       dprintk("%s: done, returned %d\n", __func__, err);
-
-       dprintk("<-- nfs_follow_mountpoint() = %d\n", err);
-       return ERR_PTR(err);
-out_err:
-       path_put(&nd->path);
-       goto out;
-out_follow:
-       while (d_mountpoint(nd->path.dentry) &&
-              follow_down(&nd->path))
-               ;
-       err = 0;
-       goto out;
+out_nofree:
+       dprintk("<-- nfs_follow_mountpoint() = %p\n", mnt);
+       return mnt;
 }
 
 const struct inode_operations nfs_mountpoint_inode_operations = {
-       .follow_link    = nfs_follow_mountpoint,
        .getattr        = nfs_getattr,
 };
 
 const struct inode_operations nfs_referral_inode_operations = {
-       .follow_link    = nfs_follow_mountpoint,
 };
 
 static void nfs_expire_automounts(struct work_struct *work)