1 files changed, 69 insertions, 0 deletions
diff --git a/mach-defpager/file_io.h b/mach-defpager/file_io.h
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+++ b/mach-defpager/file_io.h
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+/* Backing store access callbacks for Hurd version of Mach default pager.
+   Copyright (C) 2000 Free Software Foundation, Inc.
+
+   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., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#ifndef _file_io_h
+#define _file_io_h 1
+
+/* The original Mach default pager code used in serverboot can read
+   filesystem meta-data to find the blocks used by paging files.
+   We replace those interfaces with simpler code that only supports
+   subsets of devices represented by a list of runs a la libstore.  */
+
+#include <sys/types.h>
+
+#include <device/device_types.h>
+#include <device/device.h>
+
+/* A run of device records, expressed in the device's record size.  */
+struct storage_run
+{
+  recnum_t start, length;
+};
+
+struct file_direct
+{
+  mach_port_t device;
+
+  int bshift;			/* size of device records (disk blocks) */
+  size_t fd_bsize;		/* log2 of that */
+  recnum_t fd_size;		/* number of blocks total */
+
+  /* The paging area consists of the concatentation of NRUNS contiguous
+     regions of the device, as described by RUNS.  */
+  size_t nruns;
+  struct storage_run runs[0];
+};
+
+/* These are in fact only called to read or write a single page, from
+   default_pager.c::default_read/default_write.  The SIZE argument is
+   always vm_page_size and OFFSET is always page-aligned.  */
+
+int page_read_file_direct (struct file_direct *fdp,
+			   vm_offset_t offset,
+			   vm_size_t size,
+			   vm_offset_t *addr,			/* out */
+			   mach_msg_type_number_t *size_read);	/* out */
+int page_write_file_direct(struct file_direct *fdp,
+			   vm_offset_t offset,
+			   vm_offset_t addr,
+			   vm_size_t size,
+			   vm_offset_t *size_written); /* out */
+
+
+#endif /* file_io.h */