Merge tag 'for-upstream' of https://repo.or.cz/qemu/kevin into staging

Block layer patches

- qcow2 spec: Rename "zlib" compression to "deflate"
- Honour graph read lock even in the main thread + prerequisite fixes
- aio-posix: do not nest poll handlers (fixes infinite recursion)
- Refactor QMP blockdev transactions
- graph-lock: Disable locking for now
- iotests/245: Check if 'compress' driver is available

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# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]

* tag 'for-upstream' of https://repo.or.cz/qemu/kevin

: (21 commits)
  iotests: Test commit with iothreads and ongoing I/O
  nbd/server: Fix drained_poll to wake coroutine in right AioContext
  graph-lock: Disable locking for now
  tested: add test for nested aio_poll() in poll handlers
  aio-posix: do not nest poll handlers
  iotests/245: Check if 'compress' driver is available
  graph-lock: Honour read locks even in the main thread
  blockjob: Adhere to rate limit even when reentered early
  test-bdrv-drain: Call bdrv_co_unref() in coroutine context
  test-bdrv-drain: Take graph lock more selectively
  qemu-img: Take graph lock more selectively
  qcow2: Unlock the graph in qcow2_do_open() where necessary
  block/export: Fix null pointer dereference in error path
  block: Call .bdrv_co_create(_opts) unlocked
  docs/interop/qcow2.txt: fix description about "zlib" clusters
  blockdev: qmp_transaction: drop extra generic layer
  blockdev: use state.bitmap in block-dirty-bitmap-add action
  blockdev: transaction: refactor handling transaction properties
  blockdev: qmp_transaction: refactor loop to classic for
  blockdev: transactions: rename some things
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>