From 3d6e036193bfa67a8a1cc1908fe910c7a014d183 Mon Sep 17 00:00:00 2001
From: Rich Johnston <rjohnston@sgi.com>
Date: Wed, 27 Mar 2013 09:26:49 -0500
Subject: xfs: Add ratelimited printk for different alert levels

Ratelimited printk will be useful in printing xfs messages which are otherwise
not required to be printed always due to their high rate (to prevent kernel ring
buffer from overflowing), while at the same time required to be printed.

Signed-off-by: Raghavendra D Prabhu <rprabhu@wnohang.net>
Reviewed-by: Rich Johnston <rjohnston@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
---
 fs/xfs/xfs_linux.h   |  1 +
 fs/xfs/xfs_message.h | 26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

(limited to 'fs/xfs')

diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index fe7e4df85a7b..14e59d953b7b 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -72,6 +72,7 @@
 #include <linux/kthread.h>
 #include <linux/freezer.h>
 #include <linux/list_sort.h>
+#include <linux/ratelimit.h>
 
 #include <asm/page.h>
 #include <asm/div64.h>
diff --git a/fs/xfs/xfs_message.h b/fs/xfs/xfs_message.h
index 56dc0c17f16a..76c81982f964 100644
--- a/fs/xfs/xfs_message.h
+++ b/fs/xfs/xfs_message.h
@@ -30,6 +30,32 @@ void xfs_debug(const struct xfs_mount *mp, const char *fmt, ...)
 }
 #endif
 
+#define xfs_printk_ratelimited(func, dev, fmt, ...)		\
+do {									\
+	static DEFINE_RATELIMIT_STATE(_rs,				\
+				      DEFAULT_RATELIMIT_INTERVAL,	\
+				      DEFAULT_RATELIMIT_BURST);		\
+	if (__ratelimit(&_rs))						\
+		func(dev, fmt, ##__VA_ARGS__);			\
+} while (0)
+
+#define xfs_emerg_ratelimited(dev, fmt, ...)				\
+	xfs_printk_ratelimited(xfs_emerg, dev, fmt, ##__VA_ARGS__)
+#define xfs_alert_ratelimited(dev, fmt, ...)				\
+	xfs_printk_ratelimited(xfs_alert, dev, fmt, ##__VA_ARGS__)
+#define xfs_crit_ratelimited(dev, fmt, ...)				\
+	xfs_printk_ratelimited(xfs_crit, dev, fmt, ##__VA_ARGS__)
+#define xfs_err_ratelimited(dev, fmt, ...)				\
+	xfs_printk_ratelimited(xfs_err, dev, fmt, ##__VA_ARGS__)
+#define xfs_warn_ratelimited(dev, fmt, ...)				\
+	xfs_printk_ratelimited(xfs_warn, dev, fmt, ##__VA_ARGS__)
+#define xfs_notice_ratelimited(dev, fmt, ...)				\
+	xfs_printk_ratelimited(xfs_notice, dev, fmt, ##__VA_ARGS__)
+#define xfs_info_ratelimited(dev, fmt, ...)				\
+	xfs_printk_ratelimited(xfs_info, dev, fmt, ##__VA_ARGS__)
+#define xfs_debug_ratelimited(dev, fmt, ...)				\
+	xfs_printk_ratelimited(xfs_debug, dev, fmt, ##__VA_ARGS__)
+
 extern void assfail(char *expr, char *f, int l);
 
 extern void xfs_hex_dump(void *p, int length);
-- 
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