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authorMiles Bader <miles@gnu.org>1997-02-14 01:26:23 +0000
committerMiles Bader <miles@gnu.org>1997-02-14 01:26:23 +0000
commit90082cef630f4c96aea5c40eb3ed66e071200baa (patch)
tree21ae4dc357868478a3b93f40c392ae3698f484e5 /libdiskfs/file-reparent.c
parent09a4305362adcd80565cdce1a6e66e05e6175799 (diff)
Initial checkin
Diffstat (limited to 'libdiskfs/file-reparent.c')
-rw-r--r--libdiskfs/file-reparent.c66
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;
+}