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authorDavid Howells <dhowells@redhat.com>2009-04-03 16:42:37 +0100
committerDavid Howells <dhowells@redhat.com>2009-04-03 16:42:37 +0100
commit7394daa8c61dfda4baa687f133748fa0b599b017 (patch)
tree32d2c55ed60596918ec62ce6ecca186337bf4660 /fs/fscache/proc.c
parent06b3db1b9bccdc8c2c743122a89745279e5ecc46 (diff)
downloadlinux-linaro-stable-7394daa8c61dfda4baa687f133748fa0b599b017.tar.gz
FS-Cache: Add use of /proc and presentation of statistics
Make FS-Cache create its /proc interface and present various statistical information through it. Also provide the functions for updating this information. These features are enabled by: CONFIG_FSCACHE_PROC CONFIG_FSCACHE_STATS CONFIG_FSCACHE_HISTOGRAM The /proc directory for FS-Cache is also exported so that caching modules can add their own statistics there too. The FS-Cache module is loadable at this point, and the statistics files can be examined by userspace: cat /proc/fs/fscache/stats cat /proc/fs/fscache/histogram Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Steve Dickson <steved@redhat.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
Diffstat (limited to 'fs/fscache/proc.c')
-rw-r--r--fs/fscache/proc.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
new file mode 100644
index 000000000000..beeab44bc31a
--- /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);
+}