1 files changed, 73 insertions, 0 deletions
diff --git a/libdiskfs/io-map.c b/libdiskfs/io-map.c
new file mode 100644
index 00000000..6268f2c5
--- /dev/null
+++ b/libdiskfs/io-map.c
@@ -0,0 +1,73 @@
+/* 
+   Copyright (C) 1994, 1997 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 <fcntl.h>
+
+#include "priv.h"
+#include "io_S.h"
+
+/* Implement io_map as described in <hurd/io.defs>. */
+kern_return_t
+diskfs_S_io_map (struct protid *cred,
+		 memory_object_t *rdobj,
+		 mach_msg_type_name_t *rdtype,
+		 memory_object_t *wrobj,
+		 mach_msg_type_name_t *wrtype)
+{
+  int flags;
+  struct node *node;
+
+  if (!cred)
+    return EOPNOTSUPP;
+
+  *wrobj = *rdobj = MACH_PORT_NULL;
+
+  node = cred->po->np;
+  flags = cred->po->openstat & (O_READ | O_WRITE);
+
+  mutex_lock (&node->lock);
+  switch (flags)
+    {
+    case O_READ | O_WRITE:
+      *wrobj = *rdobj = diskfs_get_filemap (node, VM_PROT_READ |VM_PROT_WRITE);
+      if (*wrobj == MACH_PORT_NULL)
+	goto error;
+      mach_port_mod_refs (mach_task_self (), *rdobj, MACH_PORT_RIGHT_SEND, 1);
+      break;
+    case O_READ:
+      *rdobj = diskfs_get_filemap (node, VM_PROT_READ);
+      if (*rdobj == MACH_PORT_NULL)
+	goto error;
+      break;
+    case O_WRITE:
+      *wrobj = diskfs_get_filemap (node, VM_PROT_WRITE);
+      if (*wrobj == MACH_PORT_NULL)
+	goto error;
+      break;
+    }
+  mutex_unlock (&node->lock);
+
+  *rdtype = MACH_MSG_TYPE_MOVE_SEND;
+  *wrtype = MACH_MSG_TYPE_MOVE_SEND;
+
+  return 0;
+  
+error:
+  mutex_unlock (&node->lock);
+  return errno;
+}
+