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

Block layer patches

- Fix VHDX image corruption bug
- Fix for performance regression: Remove bdrv_co_get_geometry coroutines
  from I/O hot path

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

:
  block, block-backend: write some hot coroutine wrappers by hand
  block-backend: ignore inserted state in blk_co_nb_sectors
  block-backend: inline bdrv_co_get_geometry
  migration/block: replace uses of blk_nb_sectors that do not check result
  block: remove has_variable_length from BlockDriver
  block: refresh bs->total_sectors on reopen
  block: remove has_variable_length from filters
  block: move has_variable_length to BlockLimits
  iotests: Regression test for vhdx log corruption
  block/vhdx: fix dynamic VHDX BAT corruption

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>