[GIT PULL] Fixes for 5.4-rc8/final

[Jens Axboe <axboe@kernel.dk>]

Hi Linus,

We have a few fixes that should make it into this release. This pull
request contains:

- io_uring:
	- The timeout command assumes sequence == 0 means that we want
	  one completion, but this kind of overloading is unfortunate as
	  it prevents users from doing a pure time based wait. Since
	  this operation was introduced in this cycle, let's correct it
	  now, while we can. (me)
	- One-liner to fix an issue with dependent links and fixed
	  buffer reads. The actual IO completed fine, but the link got
	  severed since we stored the wrong expected value. (me)
	- Add TIMEOUT to list of opcodes that don't need a file. (Pavel)

- rsxx missing workqueue destry calls. Old bug. (Chuhong)

- Fix blk-iocost active list check (Jiufei)

- Fix impossible-to-hit overflow merge condition, that still hit some
  folks very rarely (Junichi)

- Fix bfq hang issue from 5.3. This didn't get marked for stable, but
  will go into stable post this merge (Paolo)

Please pull!


  git://git.kernel.dk/linux-block.git tags/for-linus-20191115


----------------------------------------------------------------
Chuhong Yuan (1):
      rsxx: add missed destroy_workqueue calls in remove

Jens Axboe (2):
      io_uring: make timeout sequence == 0 mean no sequence
      io_uring: ensure registered buffer import returns the IO length

Jiufei Xue (1):
      iocost: check active_list of all the ancestors in iocg_activate()

Junichi Nomura (1):
      block: check bi_size overflow before merge

Paolo Valente (1):
      block, bfq: deschedule empty bfq_queues not referred by any process

Pavel Begunkov (1):
      io_uring: Fix getting file for timeout

 block/bfq-iosched.c       | 32 ++++++++++++++++++++++++++------
 block/bio.c               |  2 +-
 block/blk-iocost.c        |  8 ++++++--
 drivers/block/rsxx/core.c |  2 ++
 fs/io_uring.c             | 32 ++++++++++++++++++++++++--------
 5 files changed, 59 insertions(+), 17 deletions(-)

-- 
Jens Axboe