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authorSteven Rostedt <srostedt@redhat.com>2012-08-07 16:14:16 -0400
committerSteven Rostedt <rostedt@goodmis.org>2013-03-15 00:34:45 -0400
commit0c8916c34203734d3b05953ebace52d7c2969f16 (patch)
treef975bab6327e974b9f6a274b2e104b6ddd692f0c /kernel/trace/trace.h
parent277ba04461c2746cf935353474c0961161951b68 (diff)
tracing: Add rmdir to remove multibuffer instances
Add a method to the hijacked dentry descriptor of the "instances" directory to allow for rmdir to remove an instance of a multibuffer. Example: cd /debug/tracing/instances mkdir hello ls hello/ rmdir hello ls Like the mkdir method, the i_mutex is dropped for the instances directory. The instances directory is created at boot up and can not be renamed or removed. The trace_types_lock mutex is used to synchronize adding and removing of instances. I've run several stress tests with different threads trying to create and delete directories of the same name, and it has stood up fine. Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
-rw-r--r--kernel/trace/trace.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 883fe0b62f0a..b825ea2d8c64 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1001,6 +1001,7 @@ filter_check_discard(struct ftrace_event_call *call, void *rec,
extern void trace_event_enable_cmd_record(bool enable);
extern int event_trace_add_tracer(struct dentry *parent, struct trace_array *tr);
+extern int event_trace_del_tracer(struct trace_array *tr);
extern struct mutex event_mutex;
extern struct list_head ftrace_events;