This fixes the problem that blockdev-create on a local file blocks the
main loop despite being a background job. This was caused by file-posix
preallocating the image with blocking syscalls rather than moving this
to the thread pool and yielding the coroutine meanwhile.

Kevin Wolf (2):
  block: Convert .bdrv_truncate callback to coroutine_fn
  file-posix: Make .bdrv_co_truncate asynchronous

 include/block/block.h     |   4 +
 include/block/block_int.h |   4 +-
 include/block/raw-aio.h   |   4 +-
 block.c                   |  49 +++++++-
 block/copy-on-read.c      |   8 +-
 block/crypto.c            |   9 +-
 block/file-posix.c        | 277 ++++++++++++++++++++++++++--------------------
 block/file-win32.c        |   6 +-
 block/gluster.c           |  14 ++-
 block/iscsi.c             |   8 +-
 block/nfs.c               |   7 +-
 block/qcow2.c             |  14 +--
 block/qed.c               |   8 +-
 block/raw-format.c        |   8 +-
 block/rbd.c               |   8 +-
 block/sheepdog.c          |  12 +-
 block/ssh.c               |   6 +-
 17 files changed, 267 insertions(+), 179 deletions(-)

-- 
2.13.6