[PATCH 5.12 0/8] remove task file notes

[Pavel Begunkov <asml.silence@gmail.com>]

1-2 fixes a race for io-wq, can be considered separately

3-7 introduce a mapping from ctx to all tctx, and using that removes
file notes, i.e. taking a io_uring file note previously stored in
task->io_uring->xa. It's needed because we don't free io_uring ctx
until all submitters die/exec, and it became worse after killing
->flush().
There are rough corner in a form of not behaving nicely, I'll address
in follow-up patches.

8/8 just a very useful warning.

Pavel Begunkov (8):
  io_uring: cancel-match based on flags
  io_uring: reliably cancel linked timeouts
  io_uring: make del_task_file more forgiving
  io_uring: introduce ctx to tctx back map
  io_uring: do ctx initiated file note removal
  io_uring: don't take task ring-file notes
  io_uring: index io_uring->xa by ctx not file
  io_uring: warn when ring exit takes too long

 fs/io_uring.c            | 146 ++++++++++++++++++++++++++++++---------
 include/linux/io_uring.h |   2 +-
 2 files changed, 113 insertions(+), 35 deletions(-)

-- 
2.24.0