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/* Reparent a file
Copyright (C) 1997 Free Software Foundation
Written by Miles Bader <miles@gnu.ai.mit.edu>
This file is part of the GNU Hurd.
The GNU Hurd is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
The GNU Hurd is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with the GNU Hurd; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "fs_S.h"
error_t
netfs_S_file_reparent (struct protid *cred, mach_port_t parent,
mach_port_t *new_file, mach_msg_type_name_t *new_file_type)
{
struct node *node;
struct protid *new_cred;
if (! cred)
return EOPNOTSUPP;
node = cred->po->np;
mutex_lock (&node->lock);
new_cred =
netfs_make_protid (netfs_make_peropen (node, cred->po->openstat, cred->po),
iohelp_dup_iouser (cred->user));
mutex_unlock (&node->lock);
if (new_cred)
{
/* Remove old shadow root state. */
if (new_cred->po->shadow_root && new_cred->po->shadow_root != node)
{
mutex_lock (&new_cred->po->shadow_root->lock);
netfs_nput (new_cred->po->shadow_root);
}
if (new_cred->po->shadow_root_parent)
mach_port_deallocate (mach_task_self (), new_cred->po->shadow_root_parent);
/* And install PARENT instead. */
new_cred->po->shadow_root = node;
new_cred->po->shadow_root_parent = parent;
*new_file = ports_get_right (new_cred);
*new_file_type = MACH_MSG_TYPE_MAKE_SEND;
ports_port_deref (new_cred);
return 0;
}
else
return errno;
}
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