[PATCH] OCFS2: The Second Oracle Cluster Filesystem

The OCFS2 file system module.

Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
Signed-off-by: Kurt Hackel <kurt.hackel@oracle.com>

1 files changed, 91 insertions, 0 deletions

diff --git a/fs/ocfs2/dcache.c b/fs/ocfs2/dcache.c
new file mode 100644
index 000000000000..bd85182e97bc
--- /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,
+};