[PATCH 0/6] tracing: open/delete fixes

[Oleg Nesterov <oleg@redhat.com>]

Hello.

Untested again, only for review. Sorry, I know this is annoying.
Will try to test tomorrow.

The only essential change is that "clear d_subdirs->i_private"
comes as a last patch, this needs the additional comment in the
changelogs of 1-4 but avoids the temporary complications.

I am sending this series right now because:

	- I promised to do this today ;)

	- Whatever I do, correctness-wise this needs your review
	  anyway.

	- Even if correct, the very intent needs an ack from Masami
	  who seems to disagree with this approach.

	  This series shifts the validation from f_op->open() (which
	  currently doesn't work) to ->read/write.

	  While I personally think this makes more sense (simpler
	  and does not block rmdir/event_remove), I understand that
	  this is subjective, so I won't argue too much if you prefer
	  to add the additional ref-counts instead.

>From 6/6:

	Note: this doesn't not fix other problems, event_remove() can
	destroy the active ftrace_event_call, we need more changes but
	those changes are completely orthogonal.

Oleg.

 kernel/trace/trace.h               |    4 +-
 kernel/trace/trace_events.c        |  176 ++++++++++++++++++------------------
 kernel/trace/trace_events_filter.c |   21 ++---
 3 files changed, 99 insertions(+), 102 deletions(-)