libdiskfs: Factorize code for last hard reference being released

* libdiskfs/node-lastref.c: New file
* libdiskfs/Makefile (OTHERSRCS): Add node-lastref.c
* libdiskfs/libdiskfs/node-nput.c (diskfs_nput): Replace last hard reference
code with a call to _diskfs_lastref.
* libdiskfs/node-nrele.c (diskfs_nrele): Likewise.

1 files changed, 49 insertions, 0 deletions

diff --git a/libdiskfs/node-lastref.c b/libdiskfs/node-lastref.c
new file mode 100644
index 00000000..068566a2
--- /dev/null
+++ b/libdiskfs/node-lastref.c
@@ -0,0 +1,49 @@
+/*
+   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 "priv.h"
+
+/* Called when the last hard reference is released.  If there are no
+   links, then request soft references to be dropped.  */
+void
+_diskfs_lastref (struct node *np)
+{
+  /* This is our cue that something akin to "last process closes file"
+     in the POSIX.1 sense happened, so make sure any pending node time
+     updates now happen in a timely fashion.  */
+  diskfs_set_node_times (np);
+  diskfs_lost_hardrefs (np);
+  if (!np->dn_stat.st_nlink)
+    {
+      if (np->sockaddr != MACH_PORT_NULL)
+	{
+	  mach_port_deallocate (mach_task_self (), np->sockaddr);
+	  np->sockaddr = MACH_PORT_NULL;
+	}
+
+      /* There are no links.  If there are soft references that
+	 can be dropped, we can't let them postpone deallocation.
+	 So attempt to drop them.  But that's a user-supplied
+	 routine, which might result in further recursive calls to
+	 the ref-counting system.  This is not a problem, as we
+	 hold a weak reference ourselves. */
+      diskfs_try_dropping_softrefs (np);
+    }
+}