1999-09-07 Thomas Bushnell, BSG <tb@mit.edu>

	* io-map-segment.c: New file.  Guts from io-map.c.
	* io-map.c (diskfs_S_io_map): Just call diskfs_S_io_map_segment.
	* diskfs.h (diskfs_get_filemap): New parameter `index'.
	* rdwr-internal.c (_diskfs_rdwr_internal): Pass additional
	parameter to diskfs_get_filemap.
	* Makefile (IOSRCS): Add io-map-segment.c.

6 files changed, 98 insertions, 49 deletions

diff --git a/libdiskfs/ChangeLog b/libdiskfs/ChangeLog
index 17cd4e6f..529d0814 100644
--- a/libdiskfs/ChangeLog
+++ b/libdiskfs/ChangeLog
@@ -1,3 +1,12 @@
+1999-09-07  Thomas Bushnell, BSG  <tb@mit.edu>
+
+	* io-map-segment.c: New file.  Guts from io-map.c.
+	* io-map.c (diskfs_S_io_map): Just call diskfs_S_io_map_segment.
+	* diskfs.h (diskfs_get_filemap): New parameter `index'.
+	* rdwr-internal.c (_diskfs_rdwr_internal): Pass additional
+	parameter to diskfs_get_filemap.
+	* Makefile (IOSRCS): Add io-map-segment.c.
+
 1999-07-24  Roland McGrath  <roland@baalperazim.frob.com>
 
 	* dir-rmdir.c (diskfs_S_dir_rmdir): Fix bugs in last change.
diff --git a/libdiskfs/Makefile b/libdiskfs/Makefile
index 612aaea2..a4637657 100644
--- a/libdiskfs/Makefile
+++ b/libdiskfs/Makefile
@@ -32,7 +32,8 @@ IOSRCS= io-async-icky.c io-async.c io-duplicate.c io-get-conch.c io-revoke.c \
 	io-modes-on.c io-modes-set.c io-owner-mod.c io-owner-get.c \
 	io-pathconf.c io-prenotify.c io-read.c io-readable.c io-identity.c \
 	io-reauthenticate.c io-rel-conch.c io-restrict-auth.c io-seek.c \
-	io-select.c io-stat.c io-stubs.c io-write.c io-version.c io-sigio.c
+	io-select.c io-stat.c io-stubs.c io-write.c io-version.c io-sigio.c \
+	io-map-segment.c
 FSYSSRCS=fsys-getroot.c fsys-goaway.c fsys-startup.c fsys-getfile.c \
 	fsys-options.c fsys-syncfs.c fsys-forward.c
 IFSOCKSRCS=ifsock.c
diff --git a/libdiskfs/diskfs.h b/libdiskfs/diskfs.h
index 73c55faf..499bfd5b 100644
--- a/libdiskfs/diskfs.h
+++ b/libdiskfs/diskfs.h
@@ -486,10 +486,11 @@ void diskfs_sync_everything (int wait);
    irreversable.  */
 void diskfs_shutdown_pager ();
 
-/* The user must define this function.  Return a memory object port (send
-   right) for the file contents of NP.  PROT is the maximum allowable
-   access.  On errors, return MACH_PORT_NULL and set errno.  */
-mach_port_t diskfs_get_filemap (struct node *np, vm_prot_t prot);
+/* The user must define this function.  Return a memory object port
+   (send right) for the INDEX'th 2^32 byte segment of the contents of
+   NP.  PROT is the maximum allowable access.  On errors, return
+   MACH_PORT_NULL and set errno.  */
+mach_port_t diskfs_get_filemap (struct node *np, int index, vm_prot_t prot);
 
 /* The user must define this function.  Return true if there are pager
    ports exported that might be in use by users.  If this returns false, then
diff --git a/libdiskfs/io-map-segment.c b/libdiskfs/io-map-segment.c
new file mode 100644
index 00000000..4245602d
--- /dev/null
+++ b/libdiskfs/io-map-segment.c
@@ -0,0 +1,78 @@
+/* 
+   Copyright (C) 1999 Free Software Foundation, Inc.
+   Written by Thomas Bushnell, BSG.
+
+   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 this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, 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_segment (struct protid *cred,
+			 int index,
+			 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, index, 
+					    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, index, VM_PROT_READ);
+      if (*rdobj == MACH_PORT_NULL)
+	goto error;
+      break;
+    case O_WRITE:
+      *wrobj = diskfs_get_filemap (node, index, 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;
+}
+
diff --git a/libdiskfs/io-map.c b/libdiskfs/io-map.c
index 6268f2c5..acd8adc6 100644
--- a/libdiskfs/io-map.c
+++ b/libdiskfs/io-map.c
@@ -1,5 +1,5 @@
 /* 
-   Copyright (C) 1994, 1997 Free Software Foundation
+   Copyright (C) 1994, 1997, 1999 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
@@ -28,46 +28,6 @@ diskfs_S_io_map (struct protid *cred,
 		 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;
+  return diskfs_S_io_map_segment (cred, 0, rdobj, rdtype, wrobj, wrtype);
 }
 
diff --git a/libdiskfs/rdwr-internal.c b/libdiskfs/rdwr-internal.c
index 046467a3..4c765aaa 100644
--- a/libdiskfs/rdwr-internal.c
+++ b/libdiskfs/rdwr-internal.c
@@ -1,5 +1,5 @@
 /*
-   Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation
+   Copyright (C) 1994, 1995, 1996, 1997, 1999 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
@@ -49,7 +49,7 @@ _diskfs_rdwr_internal (struct node *np,
 	np->dn_set_atime = 1;
     }
 
-  memobj = diskfs_get_filemap (np, prot);
+  memobj = diskfs_get_filemap (np, 0, prot);
 
   if (memobj == MACH_PORT_NULL)
     return errno;