1 files changed, 74 insertions, 0 deletions
diff --git a/libdiskfs/rdwr-internal.c b/libdiskfs/rdwr-internal.c
new file mode 100644
index 00000000..18a4ae1e
--- /dev/null
+++ b/libdiskfs/rdwr-internal.c
@@ -0,0 +1,74 @@
+/*
+   Copyright (C) 1994,95,96,97,99,2000 Free Software Foundation, Inc.
+
+   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"
+#include <string.h>
+#include <fcntl.h>
+#include <hurd/pager.h>
+
+/* Actually read or write a file.  The file size must already permit
+   the requested access.  NP is the file to read/write.  DATA is a buffer
+   to write from or fill on read.  OFFSET is the absolute address (-1
+   not permitted here); AMT is the size of the read/write to perform;
+   DIR is set for writing and clear for reading.  The inode must
+   be locked.  If NOTIME is set, then don't update the mtime or atime. */
+error_t
+_diskfs_rdwr_internal (struct node *np,
+		       char *data,
+		       off_t offset,
+		       size_t *amt,
+		       int dir,
+		       int notime)
+{
+  memory_object_t memobj;
+  vm_prot_t prot = dir ? (VM_PROT_READ | VM_PROT_WRITE) : VM_PROT_READ;
+  error_t err = 0;
+
+  if (dir)
+    assert (!diskfs_readonly);
+
+  if (*amt == 0)
+    /* Zero-length writes do not update mtime or anything else, by POSIX.  */
+    return 0;
+
+  if (!diskfs_check_readonly () && !notime)
+    {
+      if (dir)
+	np->dn_set_mtime = 1;
+      else if (! _diskfs_noatime)
+	np->dn_set_atime = 1;
+    }
+
+  memobj = diskfs_get_filemap (np, prot);
+
+  if (memobj == MACH_PORT_NULL)
+    return errno;
+
+  err = pager_memcpy (diskfs_get_filemap_pager_struct (np), memobj,
+		      offset, data, amt, prot);
+
+  if (!diskfs_check_readonly () && !notime)
+    {
+      if (dir)
+	np->dn_set_mtime = 1;
+      else if (!_diskfs_noatime)
+	np->dn_set_atime = 1;
+    }
+
+  mach_port_deallocate (mach_task_self (), memobj);
+  return err;
+}