move Rust sources to top level, C sources into c_src

[bcachefs-tools-debian] / c_src / include / linux / ratelimit.h

diff --git a/c_src/include/linux/ratelimit.h b/c_src/include/linux/ratelimit.h
new file mode 100644 (file)
index 0000000..680181d
--- /dev/null
+++ b/c_src/include/linux/ratelimit.h
@@ -0,0 +1,109 @@
+#ifndef _LINUX_RATELIMIT_H
+#define _LINUX_RATELIMIT_H
+
+#include <linux/printk.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+
+#define DEFAULT_RATELIMIT_INTERVAL     (5 * HZ)
+#define DEFAULT_RATELIMIT_BURST                10
+
+/* issue num suppressed message on exit */
+#define RATELIMIT_MSG_ON_RELEASE       1
+
+struct ratelimit_state {
+       raw_spinlock_t  lock;           /* protect the state */
+
+       int             interval;
+       int             burst;
+       int             printed;
+       int             missed;
+       unsigned long   begin;
+       unsigned long   flags;
+};
+
+#define RATELIMIT_STATE_INIT(name, interval_init, burst_init) {                \
+               .lock           = __RAW_SPIN_LOCK_UNLOCKED(name.lock),  \
+               .interval       = interval_init,                        \
+               .burst          = burst_init,                           \
+       }
+
+#define RATELIMIT_STATE_INIT_DISABLED                                  \
+       RATELIMIT_STATE_INIT(ratelimit_state, 0, DEFAULT_RATELIMIT_BURST)
+
+#define DEFINE_RATELIMIT_STATE(name, interval_init, burst_init)                \
+                                                                       \
+       struct ratelimit_state name =                                   \
+               RATELIMIT_STATE_INIT(name, interval_init, burst_init)   \
+
+static inline void ratelimit_state_init(struct ratelimit_state *rs,
+                                       int interval, int burst)
+{
+       memset(rs, 0, sizeof(*rs));
+
+       raw_spin_lock_init(&rs->lock);
+       rs->interval    = interval;
+       rs->burst       = burst;
+}
+
+static inline void ratelimit_default_init(struct ratelimit_state *rs)
+{
+       return ratelimit_state_init(rs, DEFAULT_RATELIMIT_INTERVAL,
+                                       DEFAULT_RATELIMIT_BURST);
+}
+
+static inline void ratelimit_state_exit(struct ratelimit_state *rs)
+{
+       if (!(rs->flags & RATELIMIT_MSG_ON_RELEASE))
+               return;
+
+       if (rs->missed) {
+               pr_warn("%s: %d output lines suppressed due to ratelimiting\n",
+                       current->comm, rs->missed);
+               rs->missed = 0;
+       }
+}
+
+static inline void
+ratelimit_set_flags(struct ratelimit_state *rs, unsigned long flags)
+{
+       rs->flags = flags;
+}
+
+extern struct ratelimit_state printk_ratelimit_state;
+
+extern int ___ratelimit(struct ratelimit_state *rs, const char *func);
+#define __ratelimit(state) ___ratelimit(state, __func__)
+
+#ifdef CONFIG_PRINTK
+
+#define WARN_ON_RATELIMIT(condition, state)                    \
+               WARN_ON((condition) && __ratelimit(state))
+
+#define WARN_RATELIMIT(condition, format, ...)                 \
+({                                                             \
+       static DEFINE_RATELIMIT_STATE(_rs,                      \
+                                     DEFAULT_RATELIMIT_INTERVAL,       \
+                                     DEFAULT_RATELIMIT_BURST); \
+       int rtn = !!(condition);                                \
+                                                               \
+       if (unlikely(rtn && __ratelimit(&_rs)))                 \
+               WARN(rtn, format, ##__VA_ARGS__);               \
+                                                               \
+       rtn;                                                    \
+})
+
+#else
+
+#define WARN_ON_RATELIMIT(condition, state)                    \
+       WARN_ON(condition)
+
+#define WARN_RATELIMIT(condition, format, ...)                 \
+({                                                             \
+       int rtn = WARN(condition, format, ##__VA_ARGS__);       \
+       rtn;                                                    \
+})
+
+#endif
+
+#endif /* _LINUX_RATELIMIT_H */