X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=fs%2F9p%2Fvfs_dentry.c;h=ddffd8aa902d65d1c389fc3a86d845ca62238210;hb=2d56d3c43cc97ae48586745556f5a5b564d61582;hp=2dd806dac9f192bb6075a1164f1d7fc69420f9c9;hpb=e7de369050534025b33aab1033358bf47a577e4d;p=powerpc.git

diff --git a/fs/9p/vfs_dentry.c b/fs/9p/vfs_dentry.c
index 2dd806dac9..ddffd8aa90 100644
--- a/fs/9p/vfs_dentry.c
+++ b/fs/9p/vfs_dentry.c
@@ -7,9 +7,8 @@
  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
  *
  *  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.
+ *  it under the terms of the GNU General Public License version 2
+ *  as published by the Free Software Foundation.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -43,46 +42,38 @@
 #include "fid.h"
 
 /**
- * v9fs_dentry_validate - VFS dcache hook to validate cache
- * @dentry:  dentry that is being validated
- * @nd: path data
+ * v9fs_dentry_delete - called when dentry refcount equals 0
+ * @dentry:  dentry in question
  *
- * dcache really shouldn't be used for 9P2000 as at all due to
- * potential attached semantics to directory traversal (walk).
- *
- * FUTURE: look into how to use dcache to allow multi-stage
- * walks in Plan 9 & potential for better dcache operation which
- * would remain valid for Plan 9 semantics.  Older versions
- * had validation via stat for those interested.  However, since
- * stat has the same approximate overhead as walk there really
- * is no difference.  The only improvement would be from a
- * time-decay cache like NFS has and that undermines the
- * synchronous nature of 9P2000.
+ * By returning 1 here we should remove cacheing of unused
+ * dentry components.
  *
  */
 
-static int v9fs_dentry_validate(struct dentry *dentry, struct nameidata *nd)
+static int v9fs_dentry_delete(struct dentry *dentry)
 {
-	struct dentry *dc = current->fs->pwd;
+	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
 
-	dprintk(DEBUG_VFS, "dentry: %s (%p)\n", dentry->d_iname, dentry);
-	if (v9fs_fid_lookup(dentry)) {
-		dprintk(DEBUG_VFS, "VALID\n");
-		return 1;
-	}
+	return 1;
+}
 
-	while (dc != NULL) {
-		if (dc == dentry) {
-			dprintk(DEBUG_VFS, "VALID\n");
-			return 1;
-		}
-		if (dc == dc->d_parent)
-			break;
+/**
+ * v9fs_cached_dentry_delete - called when dentry refcount equals 0
+ * @dentry:  dentry in question
+ *
+ * Only return 1 if our inode is invalid.  Only non-synthetic files
+ * (ones without mtime == 0) should be calling this function.
+ *
+ */
 
-		dc = dc->d_parent;
-	}
+static int v9fs_cached_dentry_delete(struct dentry *dentry)
+{
+	struct inode *inode = dentry->d_inode;
+	dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
+
+	if(!inode)
+		return 1;
 
-	dprintk(DEBUG_VFS, "INVALID\n");
 	return 0;
 }
 
@@ -117,7 +108,12 @@ void v9fs_dentry_release(struct dentry *dentry)
 	}
 }
 
+struct dentry_operations v9fs_cached_dentry_operations = {
+	.d_delete = v9fs_cached_dentry_delete,
+	.d_release = v9fs_dentry_release,
+};
+
 struct dentry_operations v9fs_dentry_operations = {
-	.d_revalidate = v9fs_dentry_validate,
+	.d_delete = v9fs_dentry_delete,
 	.d_release = v9fs_dentry_release,
 };