Merge tag 'pull-block-2023-06-05' of https://gitlab.com/hreitz/qemu into staging

Block patches

- Fix padding of unaligned vectored requests to match the host alignment
  for vectors with 1023 or 1024 buffers
- Refactor and fix bugs in parallels's image check functionality
- Add an option to the qcow2 driver to retain (qcow2-level) allocations
  on discard requests from the guest (while still forwarding the discard
  to the lower level and marking the range as zero)

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* tag 'pull-block-2023-06-05' of https://gitlab.com/hreitz/qemu:
  qcow2: add discard-no-unref option
  parallels: Incorrect condition in out-of-image check
  parallels: Replace qemu_co_mutex_lock by WITH_QEMU_LOCK_GUARD
  parallels: Move statistic collection to a separate function
  parallels: Move check of leaks to a separate function
  parallels: Fix statistics calculation
  parallels: Move check of cluster outside image to a separate function
  parallels: Move check of unclean image to a separate function
  parallels: Use generic infrastructure for BAT writing in parallels_co_check()
  parallels: create parallels_set_bat_entry_helper() to assign BAT value
  parallels: Fix image_end_offset and data_end after out-of-image check
  parallels: Fix high_off calculation in parallels_co_check()
  parallels: Out of image offset in BAT leads to image inflation
  iotests/iov-padding: New test
  util/iov: Remove qemu_iovec_init_extended()
  block: Collapse padded I/O vecs exceeding IOV_MAX
  util/iov: Make qiov_slice() public

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

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