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

Block layer patches

- Image creation: Honour pwrite_zeroes_alignment for zeroing first sector
- block-backend: Fix race (causing a crash) when resuming queued requests

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# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74  56FE 7F09 B272 C88F 2FD6

* tag 'for-upstream' of https://repo.or.cz/qemu/kevin:
  iotests: add Linux loop device image creation test
  block: use pwrite_zeroes_alignment when writing first sector
  file-posix: populate pwrite_zeroes_alignment
  block-backend: Fix race when resuming queued requests

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