Initial revision

1 files changed, 48 insertions, 0 deletions

diff --git a/libdiskfs/io-map-cntl.c b/libdiskfs/io-map-cntl.c
new file mode 100644
index 00000000..5c3aadd9
--- /dev/null
+++ b/libdiskfs/io-map-cntl.c
@@ -0,0 +1,48 @@
+/* 
+   Copyright (C) 1994 Free Software Foundation
+
+   This program 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.
+
+   This program 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 this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include "priv.h"
+
+/* Implement io_map_cntl as described in <hurd/io.defs>. */
+error_t
+S_io_map_cntl (struct protid *cred,
+	       memory_object_t *ctlobj)
+{
+  if (!cred)
+    return EOPNOTSUPP;
+  
+  assert (__vm_page_size >= sizeof (struct shared_io));
+  mutex_lock (&cred->po->np->lock);
+  if (!cred->mapped)
+    {
+      default_pager_object_create (default_pager, &cred->shared_object,
+				   __vm_page_size);
+      vm_map (mach_task_self (), (u_int *)&cred->mapped, __vm_page_size, 0, 1, 
+	      cred->shared_object, 0, 0, VM_PROT_READ|VM_PROT_WRITE,
+	      VM_PROT_READ|VM_PROT_WRITE, 0);
+      cred->mapped->conch_status = USER_HAS_NOT_CONCH;
+      spin_lock_init (&cred->mapped->lock);
+      *ctlobj = cred->shared_object;
+      mutex_unlock (&cred->po->np->lock);
+      return 0;
+    }
+  else
+    {
+      mutex_unlock (&cred->po->np->lock);
+      return EBUSY;
+    }
+}