dm: fix printk() rate limiting code

Using the same rate limiting state for different kinds of messages
is wrong because this can cause a high frequency message to suppress
a report of a low frequency message. Hence use a unique rate limiting
state per message type.

Fixes: 71a16736a15e ("dm: use local printk ratelimit")
Cc: stable@vger.kernel.org
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 8298670757e9c4c964ba270715944a1be48ac6f3..d669fddd9290d027a39fa2e65b01b0a1b24afc0a 100644 (file)
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -27,16 +27,6 @@
 
 #define DM_MSG_PREFIX "core"
 
-#ifdef CONFIG_PRINTK
-/*
- * ratelimit state to be used in DMXXX_LIMIT().
- */
-DEFINE_RATELIMIT_STATE(dm_ratelimit_state,
-                      DEFAULT_RATELIMIT_INTERVAL,
-                      DEFAULT_RATELIMIT_BURST);
-EXPORT_SYMBOL(dm_ratelimit_state);
-#endif
-
 /*
  * Cookies are numeric values sent with CHANGE and REMOVE
  * uevents while resuming, removing or renaming the device.

diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 1473455d0341bed5b157cab1cd95d8a08980e711..4f2b3b2076c42556da4d7d244ba786c2d0c045c3 100644 (file)
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -549,46 +549,29 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
  *---------------------------------------------------------------*/
 #define DM_NAME "device-mapper"
 
-#ifdef CONFIG_PRINTK
-extern struct ratelimit_state dm_ratelimit_state;
-
-#define dm_ratelimit() __ratelimit(&dm_ratelimit_state)
-#else
-#define dm_ratelimit() 0
-#endif
+#define DM_RATELIMIT(pr_func, fmt, ...)                                        \
+do {                                                                   \
+       static DEFINE_RATELIMIT_STATE(rs, DEFAULT_RATELIMIT_INTERVAL,   \
+                                     DEFAULT_RATELIMIT_BURST);         \
+                                                                       \
+       if (__ratelimit(&rs))                                           \
+               pr_func(DM_FMT(fmt), ##__VA_ARGS__);                    \
+} while (0)
 
 #define DM_FMT(fmt) DM_NAME ": " DM_MSG_PREFIX ": " fmt "\n"
 
 #define DMCRIT(fmt, ...) pr_crit(DM_FMT(fmt), ##__VA_ARGS__)
 
 #define DMERR(fmt, ...) pr_err(DM_FMT(fmt), ##__VA_ARGS__)
-#define DMERR_LIMIT(fmt, ...)                                          \
-do {                                                                   \
-       if (dm_ratelimit())                                             \
-               DMERR(fmt, ##__VA_ARGS__);                              \
-} while (0)
-
+#define DMERR_LIMIT(fmt, ...) DM_RATELIMIT(pr_err, fmt, ##__VA_ARGS__)
 #define DMWARN(fmt, ...) pr_warn(DM_FMT(fmt), ##__VA_ARGS__)
-#define DMWARN_LIMIT(fmt, ...)                                         \
-do {                                                                   \
-       if (dm_ratelimit())                                             \
-               DMWARN(fmt, ##__VA_ARGS__);                             \
-} while (0)
-
+#define DMWARN_LIMIT(fmt, ...) DM_RATELIMIT(pr_warn, fmt, ##__VA_ARGS__)
 #define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__)
-#define DMINFO_LIMIT(fmt, ...)                                         \
-do {                                                                   \
-       if (dm_ratelimit())                                             \
-               DMINFO(fmt, ##__VA_ARGS__);                             \
-} while (0)
+#define DMINFO_LIMIT(fmt, ...) DM_RATELIMIT(pr_info, fmt, ##__VA_ARGS__)
 
 #ifdef CONFIG_DM_DEBUG
 #define DMDEBUG(fmt, ...) printk(KERN_DEBUG DM_FMT(fmt), ##__VA_ARGS__)
-#define DMDEBUG_LIMIT(fmt, ...)                                                \
-do {                                                                   \
-       if (dm_ratelimit())                                             \
-               DMDEBUG(fmt, ##__VA_ARGS__);                            \
-} while (0)
+#define DMDEBUG_LIMIT(fmt, ...) DM_RATELIMIT(pr_debug, fmt, ##__VA_ARGS__)
 #else
 #define DMDEBUG(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
 #define DMDEBUG_LIMIT(fmt, ...) no_printk(fmt, ##__VA_ARGS__)