1 files changed, 72 insertions, 0 deletions
diff --git a/fs/afs/cache.c b/fs/afs/cache.c
new file mode 100644
index 000000000..b1c31ec45
--- /dev/null
+++ b/fs/afs/cache.c
@@ -0,0 +1,72 @@
+/* AFS caching stuff
+ *
+ * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * 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.
+ */
+
+#include <linux/sched.h>
+#include "internal.h"
+
+static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
+						       const void *buffer,
+						       uint16_t buflen,
+						       loff_t object_size);
+
+struct fscache_netfs afs_cache_netfs = {
+	.name			= "afs",
+	.version		= 2,
+};
+
+struct fscache_cookie_def afs_cell_cache_index_def = {
+	.name		= "AFS.cell",
+	.type		= FSCACHE_COOKIE_TYPE_INDEX,
+};
+
+struct fscache_cookie_def afs_volume_cache_index_def = {
+	.name		= "AFS.volume",
+	.type		= FSCACHE_COOKIE_TYPE_INDEX,
+};
+
+struct fscache_cookie_def afs_vnode_cache_index_def = {
+	.name		= "AFS.vnode",
+	.type		= FSCACHE_COOKIE_TYPE_DATAFILE,
+	.check_aux	= afs_vnode_cache_check_aux,
+};
+
+/*
+ * check that the auxiliary data indicates that the entry is still valid
+ */
+static enum fscache_checkaux afs_vnode_cache_check_aux(void *cookie_netfs_data,
+						       const void *buffer,
+						       uint16_t buflen,
+						       loff_t object_size)
+{
+	struct afs_vnode *vnode = cookie_netfs_data;
+	struct afs_vnode_cache_aux aux;
+
+	_enter("{%x,%x,%llx},%p,%u",
+	       vnode->fid.vnode, vnode->fid.unique, vnode->status.data_version,
+	       buffer, buflen);
+
+	memcpy(&aux, buffer, sizeof(aux));
+
+	/* check the size of the data is what we're expecting */
+	if (buflen != sizeof(aux)) {
+		_leave(" = OBSOLETE [len %hx != %zx]", buflen, sizeof(aux));
+		return FSCACHE_CHECKAUX_OBSOLETE;
+	}
+
+	if (vnode->status.data_version != aux.data_version) {
+		_leave(" = OBSOLETE [vers %llx != %llx]",
+		       aux.data_version, vnode->status.data_version);
+		return FSCACHE_CHECKAUX_OBSOLETE;
+	}
+
+	_leave(" = SUCCESS");
+	return FSCACHE_CHECKAUX_OKAY;
+}