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>

diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index fe7e4df85a7b9b2e244fd44599adcf76faefecd0..14e59d953b7bb24b65d0b31f32b737551b2eea44 100644 (file)
--- 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 56dc0c17f16a6578cade092c3cb553c48a729fc0..76c81982f9640049e0b8573bdc1dd9bb013f55f4 100644 (file)
--- 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);