From 2a061ebb71bf7a93d5e7ed71fa13dd7005745965 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@gnu.org>
Date: Mon, 13 Sep 1999 06:35:11 +0000
Subject: Reverted changes related to io_map_segment.

---
 libdiskfs/io-map.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 42 insertions(+), 2 deletions(-)

(limited to 'libdiskfs/io-map.c')

diff --git a/libdiskfs/io-map.c b/libdiskfs/io-map.c
index acd8adc6..6268f2c5 100644
--- a/libdiskfs/io-map.c
+++ b/libdiskfs/io-map.c
@@ -1,5 +1,5 @@
 /* 
-   Copyright (C) 1994, 1997, 1999 Free Software Foundation
+   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
@@ -28,6 +28,46 @@ diskfs_S_io_map (struct protid *cred,
 		 memory_object_t *wrobj,
 		 mach_msg_type_name_t *wrtype)
 {
-  return diskfs_S_io_map_segment (cred, 0, rdobj, rdtype, wrobj, 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;
 }
 
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