Initial revision

1 files changed, 65 insertions, 0 deletions

diff --git a/libdiskfs/node-rdwr.c b/libdiskfs/node-rdwr.c
new file mode 100644
index 00000000..4ee9a213
--- /dev/null
+++ b/libdiskfs/node-rdwr.c
@@ -0,0 +1,65 @@
+/* 
+   Copyright (C) 1994 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 "priv.h"
+
+/* Reading and writing of files. this is called by other filesystem
+   routines and handles extension of files and reads of more than is
+   left automatically.  NP is the node to be read or written.  DATA
+   will be written or filled.  OFF identifies where in thi fel the I/O
+   is to take place (-1 is not allowed).  AMT is the size of DATA and
+   tells how much to copy.  DIR is 1 for writing and 0 for reading.
+   CRED is the user doing the access (only used to validate attempted
+   file extension). */
+error_t
+diskfs_noderdwr (struct inode *ip, 
+	 char *data,
+	 off_t off, 
+	 int amt, 
+	 int dir,
+	 struct protid *cred)
+{
+  error_t err;
+  
+  if (err = ioserver_get_conch (&ip->i_conch))
+    return err;
+  
+  if (!(err = catch_exception ()))
+    {
+      if (dir)
+	while (off + amt > ip->i_allocsize)
+	  if (err = file_extend (ip, off + amt, cred))
+	    return err;
+
+      if (off + amt > ip->di->di_size)
+	{
+	  assert (dir);		/* reads can't go past EOF internally */
+	  if (dir)
+	    {
+	      ip->di->di_size = off + amt;
+	      ip->di->di_ctime = wallclock->seconds;
+	    }
+	}
+      end_catch_exception ();
+    }
+  if (err)
+    return err;
+  
+  err = io_rdwr (ip, data, off, amt, dir);
+
+  return err;
+}