diff options
| -rw-r--r-- | libdiskfs/file-reparent.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/libdiskfs/file-reparent.c b/libdiskfs/file-reparent.c new file mode 100644 index 00000000..83b4b309 --- /dev/null +++ b/libdiskfs/file-reparent.c @@ -0,0 +1,66 @@ +/* Reparent a file + + Copyright (C) 1997 Free Software Foundation + + 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 "priv.h" +#include "fs_S.h" + +error_t +diskfs_S_file_reparent (struct protid *cred, mach_port_t parent, + mach_port_t *new, mach_msg_type_name_t *new_type) +{ + error_t err; + struct node *node; + struct protid *new_cred; + + if (! cred) + return EOPNOTSUPP; + + node = cred->po->np; + + mutex_lock (&node->lock); + err = diskfs_create_protid (diskfs_make_peropen (node, cred->po->openstat, + cred->po), + cred->user, &new_cred); + mutex_unlock (&node->lock); + + if (! err) + { + /* Remove old shadow root state. */ + if (new_cred->po->shadow_root) + { + mutex_lock (&new_cred->po->shadow_root->lock); + diskfs_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; + diskfs_nref (node); + new_cred->po->shadow_root_parent = parent; + + *new = ports_get_right (new_cred); + *new_type = MACH_MSG_TYPE_MAKE_SEND; + + ports_port_deref (new_cred); + } + + return err; +} |