Merge branch 'for-linus' of git://git.kernel.dk/linux-block

[mirror_ubuntu-artful-kernel.git] / kernel / trace / trace_events_trigger.c

diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index b38f617b618185d907670ca77774b3332bdb63db..d67992f3bb0ee02551487dfa9a87fc39e924a96c 100644 (file)
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -28,8 +28,7 @@
 static LIST_HEAD(trigger_commands);
 static DEFINE_MUTEX(trigger_cmd_mutex);
 
-static void
-trigger_data_free(struct event_trigger_data *data)
+void trigger_data_free(struct event_trigger_data *data)
 {
        if (data->cmd_ops->set_filter)
                data->cmd_ops->set_filter(NULL, data, NULL);
@@ -73,18 +72,20 @@ event_triggers_call(struct trace_event_file *file, void *rec)
                return tt;
 
        list_for_each_entry_rcu(data, &file->triggers, list) {
+               if (data->paused)
+                       continue;
                if (!rec) {
-                       data->ops->func(data);
+                       data->ops->func(data, rec);
                        continue;
                }
                filter = rcu_dereference_sched(data->filter);
                if (filter && !filter_match_preds(filter, rec))
                        continue;
-               if (data->cmd_ops->post_trigger) {
+               if (event_command_post_trigger(data->cmd_ops)) {
                        tt |= data->cmd_ops->trigger_type;
                        continue;
                }
-               data->ops->func(data);
+               data->ops->func(data, rec);
        }
        return tt;
 }
@@ -94,6 +95,7 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
  * event_triggers_post_call - Call 'post_triggers' for a trace event
  * @file: The trace_event_file associated with the event
  * @tt: enum event_trigger_type containing a set bit for each trigger to invoke
+ * @rec: The trace entry for the event
  *
  * For each trigger associated with an event, invoke the trigger
  * function registered with the associated trigger command, if the
@@ -104,13 +106,16 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
  */
 void
 event_triggers_post_call(struct trace_event_file *file,
-                        enum event_trigger_type tt)
+                        enum event_trigger_type tt,
+                        void *rec)
 {
        struct event_trigger_data *data;
 
        list_for_each_entry_rcu(data, &file->triggers, list) {
+               if (data->paused)
+                       continue;
                if (data->cmd_ops->trigger_type & tt)
-                       data->ops->func(data);
+                       data->ops->func(data, rec);
        }
 }
 EXPORT_SYMBOL_GPL(event_triggers_post_call);
@@ -188,6 +193,19 @@ static int event_trigger_regex_open(struct inode *inode, struct file *file)
                return -ENODEV;
        }
 
+       if ((file->f_mode & FMODE_WRITE) &&
+           (file->f_flags & O_TRUNC)) {
+               struct trace_event_file *event_file;
+               struct event_command *p;
+
+               event_file = event_file_data(file);
+
+               list_for_each_entry(p, &trigger_commands, list) {
+                       if (p->unreg_all)
+                               p->unreg_all(event_file);
+               }
+       }
+
        if (file->f_mode & FMODE_READ) {
                ret = seq_open(file, &event_triggers_seq_ops);
                if (!ret) {
@@ -306,7 +324,7 @@ const struct file_operations event_trigger_fops = {
  * Currently we only register event commands from __init, so mark this
  * __init too.
  */
-static __init int register_event_command(struct event_command *cmd)
+__init int register_event_command(struct event_command *cmd)
 {
        struct event_command *p;
        int ret = 0;
@@ -395,9 +413,8 @@ event_trigger_print(const char *name, struct seq_file *m,
  *
  * Return: 0 on success, errno otherwise
  */
-static int
-event_trigger_init(struct event_trigger_ops *ops,
-                  struct event_trigger_data *data)
+int event_trigger_init(struct event_trigger_ops *ops,
+                      struct event_trigger_data *data)
 {
        data->ref++;
        return 0;
@@ -425,8 +442,8 @@ event_trigger_free(struct event_trigger_ops *ops,
                trigger_data_free(data);
 }
 
-static int trace_event_trigger_enable_disable(struct trace_event_file *file,
-                                             int trigger_enable)
+int trace_event_trigger_enable_disable(struct trace_event_file *file,
+                                      int trigger_enable)
 {
        int ret = 0;
 
@@ -483,13 +500,14 @@ clear_event_triggers(struct trace_array *tr)
  * its TRIGGER_COND bit set, otherwise the TRIGGER_COND bit should be
  * cleared.
  */
-static void update_cond_flag(struct trace_event_file *file)
+void update_cond_flag(struct trace_event_file *file)
 {
        struct event_trigger_data *data;
        bool set_cond = false;
 
        list_for_each_entry_rcu(data, &file->triggers, list) {
-               if (data->filter || data->cmd_ops->post_trigger) {
+               if (data->filter || event_command_post_trigger(data->cmd_ops) ||
+                   event_command_needs_rec(data->cmd_ops)) {
                        set_cond = true;
                        break;
                }
@@ -560,9 +578,9 @@ out:
  * Usually used directly as the @unreg method in event command
  * implementations.
  */
-static void unregister_trigger(char *glob, struct event_trigger_ops *ops,
-                              struct event_trigger_data *test,
-                              struct trace_event_file *file)
+void unregister_trigger(char *glob, struct event_trigger_ops *ops,
+                       struct event_trigger_data *test,
+                       struct trace_event_file *file)
 {
        struct event_trigger_data *data;
        bool unregistered = false;
@@ -696,9 +714,9 @@ event_trigger_callback(struct event_command *cmd_ops,
  *
  * Return: 0 on success, errno otherwise
  */
-static int set_trigger_filter(char *filter_str,
-                             struct event_trigger_data *trigger_data,
-                             struct trace_event_file *file)
+int set_trigger_filter(char *filter_str,
+                      struct event_trigger_data *trigger_data,
+                      struct trace_event_file *file)
 {
        struct event_trigger_data *data = trigger_data;
        struct event_filter *filter = NULL, *tmp;
@@ -747,7 +765,7 @@ static int set_trigger_filter(char *filter_str,
 }
 
 static void
-traceon_trigger(struct event_trigger_data *data)
+traceon_trigger(struct event_trigger_data *data, void *rec)
 {
        if (tracing_is_on())
                return;
@@ -756,7 +774,7 @@ traceon_trigger(struct event_trigger_data *data)
 }
 
 static void
-traceon_count_trigger(struct event_trigger_data *data)
+traceon_count_trigger(struct event_trigger_data *data, void *rec)
 {
        if (tracing_is_on())
                return;
@@ -771,7 +789,7 @@ traceon_count_trigger(struct event_trigger_data *data)
 }
 
 static void
-traceoff_trigger(struct event_trigger_data *data)
+traceoff_trigger(struct event_trigger_data *data, void *rec)
 {
        if (!tracing_is_on())
                return;
@@ -780,7 +798,7 @@ traceoff_trigger(struct event_trigger_data *data)
 }
 
 static void
-traceoff_count_trigger(struct event_trigger_data *data)
+traceoff_count_trigger(struct event_trigger_data *data, void *rec)
 {
        if (!tracing_is_on())
                return;
@@ -876,13 +894,13 @@ static struct event_command trigger_traceoff_cmd = {
 
 #ifdef CONFIG_TRACER_SNAPSHOT
 static void
-snapshot_trigger(struct event_trigger_data *data)
+snapshot_trigger(struct event_trigger_data *data, void *rec)
 {
        tracing_snapshot();
 }
 
 static void
-snapshot_count_trigger(struct event_trigger_data *data)
+snapshot_count_trigger(struct event_trigger_data *data, void *rec)
 {
        if (!data->count)
                return;
@@ -890,7 +908,7 @@ snapshot_count_trigger(struct event_trigger_data *data)
        if (data->count != -1)
                (data->count)--;
 
-       snapshot_trigger(data);
+       snapshot_trigger(data, rec);
 }
 
 static int
@@ -969,13 +987,13 @@ static __init int register_trigger_snapshot_cmd(void) { return 0; }
 #define STACK_SKIP 3
 
 static void
-stacktrace_trigger(struct event_trigger_data *data)
+stacktrace_trigger(struct event_trigger_data *data, void *rec)
 {
        trace_dump_stack(STACK_SKIP);
 }
 
 static void
-stacktrace_count_trigger(struct event_trigger_data *data)
+stacktrace_count_trigger(struct event_trigger_data *data, void *rec)
 {
        if (!data->count)
                return;
@@ -983,7 +1001,7 @@ stacktrace_count_trigger(struct event_trigger_data *data)
        if (data->count != -1)
                (data->count)--;
 
-       stacktrace_trigger(data);
+       stacktrace_trigger(data, rec);
 }
 
 static int
@@ -1017,7 +1035,7 @@ stacktrace_get_trigger_ops(char *cmd, char *param)
 static struct event_command trigger_stacktrace_cmd = {
        .name                   = "stacktrace",
        .trigger_type           = ETT_STACKTRACE,
-       .post_trigger           = true,
+       .flags                  = EVENT_CMD_FL_POST_TRIGGER,
        .func                   = event_trigger_callback,
        .reg                    = register_trigger,
        .unreg                  = unregister_trigger,
@@ -1054,7 +1072,7 @@ struct enable_trigger_data {
 };
 
 static void
-event_enable_trigger(struct event_trigger_data *data)
+event_enable_trigger(struct event_trigger_data *data, void *rec)
 {
        struct enable_trigger_data *enable_data = data->private_data;
 
@@ -1065,7 +1083,7 @@ event_enable_trigger(struct event_trigger_data *data)
 }
 
 static void
-event_enable_count_trigger(struct event_trigger_data *data)
+event_enable_count_trigger(struct event_trigger_data *data, void *rec)
 {
        struct enable_trigger_data *enable_data = data->private_data;
 
@@ -1079,7 +1097,7 @@ event_enable_count_trigger(struct event_trigger_data *data)
        if (data->count != -1)
                (data->count)--;
 
-       event_enable_trigger(data);
+       event_enable_trigger(data, rec);
 }
 
 static int