FS-Cache: Add use of /proc and presentation of statistics

[pandora-kernel.git] / fs / fscache / proc.c

diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
new file mode 100644 (file)
index 0000000..beeab44
--- /dev/null
+++ b/fs/fscache/proc.c
@@ -0,0 +1,68 @@
+/* FS-Cache statistics viewing interface
+ *
+ * Copyright (C) 2007 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.
+ */
+
+#define FSCACHE_DEBUG_LEVEL OPERATION
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include "internal.h"
+
+/*
+ * initialise the /proc/fs/fscache/ directory
+ */
+int __init fscache_proc_init(void)
+{
+       _enter("");
+
+       if (!proc_mkdir("fs/fscache", NULL))
+               goto error_dir;
+
+#ifdef CONFIG_FSCACHE_STATS
+       if (!proc_create("fs/fscache/stats", S_IFREG | 0444, NULL,
+                        &fscache_stats_fops))
+               goto error_stats;
+#endif
+
+#ifdef CONFIG_FSCACHE_HISTOGRAM
+       if (!proc_create("fs/fscache/histogram", S_IFREG | 0444, NULL,
+                        &fscache_histogram_fops))
+               goto error_histogram;
+#endif
+
+       _leave(" = 0");
+       return 0;
+
+#ifdef CONFIG_FSCACHE_HISTOGRAM
+error_histogram:
+#endif
+#ifdef CONFIG_FSCACHE_STATS
+       remove_proc_entry("fs/fscache/stats", NULL);
+error_stats:
+#endif
+       remove_proc_entry("fs/fscache", NULL);
+error_dir:
+       _leave(" = -ENOMEM");
+       return -ENOMEM;
+}
+
+/*
+ * clean up the /proc/fs/fscache/ directory
+ */
+void fscache_proc_cleanup(void)
+{
+#ifdef CONFIG_FSCACHE_HISTOGRAM
+       remove_proc_entry("fs/fscache/histogram", NULL);
+#endif
+#ifdef CONFIG_FSCACHE_STATS
+       remove_proc_entry("fs/fscache/stats", NULL);
+#endif
+       remove_proc_entry("fs/fscache", NULL);
+}