Cloned the native implementation of netfs_S_fsys_getroot.

I cloned the native implementation of netfs_S_fsys_getroot,
since we filter translators run on nsmux nodes to see the
translator stacks of the real filesystem nodes.

2 files changed, 148 insertions, 0 deletions

diff --git a/nsmux.c b/nsmux.c
index 0269f09c7..a39955997 100644
--- a/nsmux.c
+++ b/nsmux.c
@@ -1382,6 +1382,135 @@ netfs_S_dir_lookup
   return error;
 	}/*netfs_S_dir_lookup*/
 /*----------------------------------------------------------------------------*/
+/*Responds to RPC fsys_getroot*/
+error_t
+netfs_S_fsys_getroot
+	(
+	mach_port_t cntl,
+  mach_port_t reply,
+  mach_msg_type_name_t reply_type,
+  mach_port_t dotdot,
+  uid_t *uids,
+  mach_msg_type_number_t nuids,
+  uid_t *gids,
+  mach_msg_type_number_t ngids,
+  int flags,
+  retry_type *do_retry,
+  char *retry_name,
+  mach_port_t *retry_port,
+  mach_msg_type_name_t *retry_port_type
+  )
+  {
+	LOG_MSG("netfs_S_fsys_getroot");
+
+  struct port_info *pt = ports_lookup_port (netfs_port_bucket, cntl,
+					    netfs_control_class);
+  struct iouser *cred;
+  error_t err;
+  struct protid *newpi;
+  mode_t type;
+  struct peropen peropen_context = { root_parent: dotdot };
+
+  if (!pt)
+    return EOPNOTSUPP;
+  ports_port_deref (pt);
+
+  err = iohelp_create_complex_iouser (&cred, uids, nuids, gids, ngids);
+  if (err)
+    return err;
+
+  flags &= O_HURD;
+
+  mutex_lock (&netfs_root_node->lock);
+  err = netfs_validate_stat (netfs_root_node, cred);
+  if (err)
+    goto out;
+
+  type = netfs_root_node->nn_stat.st_mode & S_IFMT;
+
+  if (((netfs_root_node->nn_stat.st_mode & S_IPTRANS)
+       || fshelp_translated (&netfs_root_node->transbox))
+      && !(flags & O_NOTRANS))
+    {
+      err = fshelp_fetch_root (&netfs_root_node->transbox,
+			       &peropen_context, dotdot, cred, flags,
+			       _netfs_translator_callback1,
+			       _netfs_translator_callback2,
+			       do_retry, retry_name, retry_port);
+      if (err != ENOENT)
+	{
+	  mutex_unlock (&netfs_root_node->lock);
+	  iohelp_free_iouser (cred);
+	  if (!err)
+	    *retry_port_type = MACH_MSG_TYPE_MOVE_SEND;
+	  return err;
+	}
+      /* ENOENT means translator has vanished inside fshelp_fetch_root. */
+      err = 0;
+    }
+
+  if (type == S_IFLNK && !(flags & (O_NOLINK | O_NOTRANS)))
+    {
+      char pathbuf[netfs_root_node->nn_stat.st_size + 1];
+
+      err = netfs_attempt_readlink (cred, netfs_root_node, pathbuf);
+
+      if (err)
+	goto out;
+
+      mutex_unlock (&netfs_root_node->lock);
+      iohelp_free_iouser (cred);
+
+      if (pathbuf[0] == '/')
+	{
+	  *do_retry = FS_RETRY_MAGICAL;
+	  *retry_port = MACH_PORT_NULL;
+	  *retry_port_type = MACH_MSG_TYPE_COPY_SEND;
+	  strcpy (retry_name, pathbuf);
+	  mach_port_deallocate (mach_task_self (), dotdot);
+	  return 0;
+	}
+      else
+	{
+	  *do_retry = FS_RETRY_REAUTH;
+	  *retry_port = dotdot;
+	  *retry_port_type = MACH_MSG_TYPE_MOVE_SEND;
+	  strcpy (retry_name, pathbuf);
+	  return 0;
+	}
+    }
+
+  if ((type == S_IFSOCK || type == S_IFBLK || type == S_IFCHR
+      || type == S_IFIFO) && (flags & (O_READ|O_WRITE|O_EXEC)))
+    {
+      err = EOPNOTSUPP;
+      goto out;
+    }
+
+  err = netfs_check_open_permissions (cred, netfs_root_node, flags, 0);
+  if (err)
+    goto out;
+
+  flags &= ~OPENONLY_STATE_MODES;
+
+  newpi = netfs_make_protid (netfs_make_peropen (netfs_root_node, flags,
+						 &peropen_context),
+			     cred);
+  mach_port_deallocate (mach_task_self (), dotdot);
+
+  *do_retry = FS_RETRY_NORMAL;
+  *retry_port = ports_get_right (newpi);
+  *retry_port_type = MACH_MSG_TYPE_MAKE_SEND;
+  retry_name[0] = '\0';
+  ports_port_deref (newpi);
+
+ out:
+  if (err)
+    iohelp_free_iouser (cred);
+  mutex_unlock (&netfs_root_node->lock);
+  return err;
+  }/*netfs_S_fsys_getroot*/
+/*----------------------------------------------------------------------------*/
 /*Deletes `name` in `dir` for `user`*/
 error_t
 netfs_attempt_unlink
diff --git a/nsmux.h b/nsmux.h
index a38874d68..fb7504419 100644
--- a/nsmux.h
+++ b/nsmux.h
@@ -186,6 +186,25 @@ netfs_S_dir_lookup
 	mach_msg_type_number_t * retry_port_type
 	);
 /*----------------------------------------------------------------------------*/
+/*Responds to RPC fsys_getroot*/
+error_t
+netfs_S_fsys_getroot
+	(
+	mach_port_t cntl,
+  mach_port_t reply,
+  mach_msg_type_name_t reply_type,
+  mach_port_t dotdot,
+  uid_t *uids,
+  mach_msg_type_number_t nuids,
+  uid_t *gids,
+  mach_msg_type_number_t ngids,
+  int flags,
+  retry_type *do_retry,
+  char *retry_name,
+  mach_port_t *retry_port,
+  mach_msg_type_name_t *retry_port_type
+  );
+/*----------------------------------------------------------------------------*/
 /*Deletes `name` in `dir` for `user`*/
 error_t
 netfs_attempt_unlink