btrfs: introduce ratelimited _in_rcu variants of message printing functions

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 88acdffbe384f0ff61f9a4f5aacc15c4150bda6c..9c0fd901edbeda0a3aad342afb81e9a5e060c315 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -4057,16 +4057,38 @@ void btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...)
 #define btrfs_info_in_rcu(fs_info, fmt, args...) \
        btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
 
+/*
+ * Wrappers that use a ratelimited printk_in_rcu
+ */
+#define btrfs_emerg_rl_in_rcu(fs_info, fmt, args...) \
+       btrfs_printk_rl_in_rcu(fs_info, KERN_EMERG fmt, ##args)
+#define btrfs_alert_rl_in_rcu(fs_info, fmt, args...) \
+       btrfs_printk_rl_in_rcu(fs_info, KERN_ALERT fmt, ##args)
+#define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
+       btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
+#define btrfs_err_rl_in_rcu(fs_info, fmt, args...) \
+       btrfs_printk_rl_in_rcu(fs_info, KERN_ERR fmt, ##args)
+#define btrfs_warn_rl_in_rcu(fs_info, fmt, args...) \
+       btrfs_printk_rl_in_rcu(fs_info, KERN_WARNING fmt, ##args)
+#define btrfs_notice_rl_in_rcu(fs_info, fmt, args...) \
+       btrfs_printk_rl_in_rcu(fs_info, KERN_NOTICE fmt, ##args)
+#define btrfs_info_rl_in_rcu(fs_info, fmt, args...) \
+       btrfs_printk_rl_in_rcu(fs_info, KERN_INFO fmt, ##args)
+
 #ifdef DEBUG
 #define btrfs_debug(fs_info, fmt, args...) \
        btrfs_printk(fs_info, KERN_DEBUG fmt, ##args)
 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
        btrfs_printk_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
+#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
+       btrfs_printk_rl_in_rcu(fs_info, KERN_DEBUG fmt, ##args)
 #else
 #define btrfs_debug(fs_info, fmt, args...) \
     no_printk(KERN_DEBUG fmt, ##args)
 #define btrfs_debug_in_rcu(fs_info, fmt, args...) \
        no_printk(KERN_DEBUG fmt, ##args)
+#define btrfs_debug_rl_in_rcu(fs_info, fmt, args...) \
+       no_printk(KERN_DEBUG fmt, ##args)
 #endif
 
 #define btrfs_printk_in_rcu(fs_info, fmt, args...)     \
@@ -4076,6 +4098,22 @@ do {                                                     \
        rcu_read_unlock();                              \
 } while (0)
 
+#define btrfs_printk_ratelimited(fs_info, fmt, args...)                \
+do {                                                           \
+       static DEFINE_RATELIMIT_STATE(_rs,                      \
+               DEFAULT_RATELIMIT_INTERVAL,                     \
+               DEFAULT_RATELIMIT_BURST);                       \
+       if (__ratelimit(&_rs))                                  \
+               btrfs_printk(fs_info, fmt, ##args);             \
+} while (0)
+
+#define btrfs_printk_rl_in_rcu(fs_info, fmt, args...)          \
+do {                                                           \
+       rcu_read_lock();                                        \
+       btrfs_printk_ratelimited(fs_info, fmt, ##args);         \
+       rcu_read_unlock();                                      \
+} while (0)
+
 #ifdef CONFIG_BTRFS_ASSERT
 
 __cold