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-rw-r--r--fs/ocfs2/dcache.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
new file mode 100644
index 00000000000..bd85182e97b
--- /dev/null
+++ b/fs/ocfs2/dcache.c
@@ -0,0 +1,91 @@
+/* -*- mode: c; c-basic-offset: 8; -*-
+ * vim: noexpandtab sw=8 ts=8 sts=0:
+ *
+ * dcache.c
+ *
+ * dentry cache handling code
+ *
+ * Copyright (C) 2002, 2004 Oracle. All rights reserved.
+ *
+ * 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 of the License, 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., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#include <linux/fs.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/namei.h>
+
+#define MLOG_MASK_PREFIX ML_DCACHE
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+
+#include "alloc.h"
+#include "dcache.h"
+#include "file.h"
+#include "inode.h"
+
+static int ocfs2_dentry_revalidate(struct dentry *dentry,
+ struct nameidata *nd)
+{
+ struct inode *inode = dentry->d_inode;
+ int ret = 0; /* if all else fails, just return false */
+ struct ocfs2_super *osb;
+
+ mlog_entry("(0x%p, '%.*s')\n", dentry,
+ dentry->d_name.len, dentry->d_name.name);
+
+ /* Never trust a negative dentry - force a new lookup. */
+ if (inode == NULL) {
+ mlog(0, "negative dentry: %.*s\n", dentry->d_name.len,
+ dentry->d_name.name);
+ goto bail;
+ }
+
+ osb = OCFS2_SB(inode->i_sb);
+
+ BUG_ON(!osb);
+
+ if (inode != osb->root_inode) {
+ spin_lock(&OCFS2_I(inode)->ip_lock);
+ /* did we or someone else delete this inode? */
+ if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
+ spin_unlock(&OCFS2_I(inode)->ip_lock);
+ mlog(0, "inode (%"MLFu64") deleted, returning false\n",
+ OCFS2_I(inode)->ip_blkno);
+ goto bail;
+ }
+ spin_unlock(&OCFS2_I(inode)->ip_lock);
+
+ if (!inode->i_nlink) {
+ mlog(0, "Inode %"MLFu64" orphaned, returning false "
+ "dir = %d\n", OCFS2_I(inode)->ip_blkno,
+ S_ISDIR(inode->i_mode));
+ goto bail;
+ }
+ }
+
+ ret = 1;
+
+bail:
+ mlog_exit(ret);
+
+ return ret;
+}
+
+struct dentry_operations ocfs2_dentry_ops = {
+ .d_revalidate = ocfs2_dentry_revalidate,
+};