1 files changed, 72 insertions, 0 deletions
diff --git a/libdiskfs/conch-fetch.c b/libdiskfs/conch-fetch.c
new file mode 100644
index 00000000..2c5d0fd8
--- /dev/null
+++ b/libdiskfs/conch-fetch.c
@@ -0,0 +1,72 @@
+/* 
+   Copyright (C) 1994, 1995, 1996, 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
+   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 <hurd/iohelp.h>
+
+/* Update our copy of the relevant fields from a shared page.  Callers
+   must have the share lock on the shared page as well as the inode
+   toplock.  This is called by the conch management facilities of 
+   libioserver as well as by us.  */
+void
+iohelp_fetch_shared_data (void *arg)
+{
+  struct protid *cred = arg;
+  int mod = 0;
+  
+  /* Don't allow the user to grow the file past the alloc size. */
+  if (cred->mapped->file_size > cred->po->np->allocsize)
+    cred->mapped->file_size = cred->po->np->allocsize;
+
+  /* Don't allow the user to truncate the file this way. */
+  if (cred->mapped->file_size < cred->po->np->dn_stat.st_size)
+    cred->mapped->file_size = cred->po->np->dn_stat.st_size;
+  else if (cred->po->np->dn_stat.st_size != cred->mapped->file_size)
+    {
+      /* The user can validly set the size, but block the attempt
+	 if we are readonly. */
+      if (diskfs_check_readonly ())
+	cred->mapped->file_size = cred->po->np->dn_stat.st_size;
+      else
+	{
+	  cred->po->np->dn_stat.st_size = cred->mapped->file_size;
+	  cred->po->np->dn_set_ctime = 1;
+	  mod = 1;
+	}
+    }
+  
+  cred->po->filepointer = cred->mapped->xx_file_pointer;
+      
+  if (!diskfs_check_readonly ())
+    {
+      if (cred->mapped->written)
+	{
+	  cred->po->np->dn_set_mtime = 1;
+	  mod = 1;
+	}
+      if (cred->mapped->accessed && ! _diskfs_noatime)
+	{
+	  cred->po->np->dn_set_atime = 1;
+	  mod = 1;
+	}
+    }
+  cred->mapped->written = 0;
+  cred->mapped->accessed = 0;
+  if (diskfs_synchronous && mod)
+    diskfs_node_update (cred->po->np, 1);
+}
+