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| author | Steven Rostedt <srostedt@redhat.com> | 2009-12-07 09:06:24 -0500 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2009-12-07 12:01:35 -0500 |
| commit | c521efd1700a8c0f7ce26f011f5eaecca17fabfa (patch) | |
| tree | 8dd9f8171222e856aafa5db1c1a150098327d409 /kernel | |
| parent | 6ec22f9b037fc0c2e00ddb7023fad279c365324d (diff) | |
| download | op-kernel-dev-c521efd1700a8c0f7ce26f011f5eaecca17fabfa.zip op-kernel-dev-c521efd1700a8c0f7ce26f011f5eaecca17fabfa.tar.gz | |
tracing: Add pipe_close interface
An ftrace plugin can add a pipe_open interface when the user opens
trace_pipe. But if the plugin allocates something within the pipe_open
it can not free it because there exists no pipe_close. The hook to
the trace file open has a corresponding close. The closing of the
trace_pipe file should also have a corresponding close.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/trace/trace.c | 4 | ||||
| -rw-r--r-- | kernel/trace/trace.h | 2 |
2 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 874f289..f804b40 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -2898,6 +2898,10 @@ static int tracing_release_pipe(struct inode *inode, struct file *file) else cpumask_clear_cpu(iter->cpu_file, tracing_reader_cpumask); + + if (iter->trace->pipe_open) + iter->trace->pipe_close(iter); + mutex_unlock(&trace_types_lock); free_cpumask_var(iter->started); diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 1d7f483..7fa33ca 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -272,6 +272,7 @@ struct tracer_flags { * @pipe_open: called when the trace_pipe file is opened * @wait_pipe: override how the user waits for traces on trace_pipe * @close: called when the trace file is released + * @pipe_close: called when the trace_pipe file is released * @read: override the default read callback on trace_pipe * @splice_read: override the default splice_read callback on trace_pipe * @selftest: selftest to run on boot (see trace_selftest.c) @@ -290,6 +291,7 @@ struct tracer { void (*pipe_open)(struct trace_iterator *iter); void (*wait_pipe)(struct trace_iterator *iter); void (*close)(struct trace_iterator *iter); + void (*pipe_close)(struct trace_iterator *iter); ssize_t (*read)(struct trace_iterator *iter, struct file *filp, char __user *ubuf, size_t cnt, loff_t *ppos); |
