This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / fs / ocfs2 / dcache.c

diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
new file mode 100644 (file)
index 0000000..1a01380
--- /dev/null
+++ b/fs/ocfs2/dcache.c
@@ -0,0 +1,92 @@
+/* -*- 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 (%llu) deleted, returning false\n",
+                            (unsigned long long)OCFS2_I(inode)->ip_blkno);
+                       goto bail;
+               }
+               spin_unlock(&OCFS2_I(inode)->ip_lock);
+
+               if (!inode->i_nlink) {
+                       mlog(0, "Inode %llu orphaned, returning false "
+                            "dir = %d\n",
+                            (unsigned long long)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,
+};