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-rw-r--r--libdiskfs/node-nref.c40
1 files changed, 40 insertions, 0 deletions
diff --git a/libdiskfs/node-nref.c b/libdiskfs/node-nref.c
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+/*
+ 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"
+
+/* Add a hard reference to a node. If there were no hard
+ references previously, then the node cannot be locked
+ (because you must hold a hard reference to hold the lock). */
+void
+diskfs_nref (struct node *np)
+{
+ int new_hardref;
+ spin_lock (&diskfs_node_refcnt_lock);
+ np->references++;
+ new_hardref = (np->references == 1);
+ spin_unlock (&diskfs_node_refcnt_lock);
+ if (new_hardref)
+ {
+ mutex_lock (&np->lock);
+ diskfs_new_hardrefs (np);
+ mutex_unlock (&np->lock);
+ }
+}