Merge tag 'for-upstream' of https://gitlab.com/kmwolf/qemu into staging

Block layer patches

- export/fuse: Use coroutines and multi-threading
- curl: Add force-range option
- nfs: add support for libnfs v6

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* tag 'for-upstream' of https://gitlab.com/kmwolf/qemu: (28 commits)
  block/curl: add support for S3 presigned URLs
  qapi: block: Refactor HTTP(s) common arguments
  block/nfs: add support for libnfs v6
  iotests/308: Add multi-threading sanity test
  qapi/block-export: Document FUSE's multi-threading
  fuse: Implement multi-threading
  fuse: Make shared export state atomic
  iotests/307: Test multi-thread export interface
  block/export: Add multi-threading interface
  fuse: Process requests in coroutines
  fuse: Reduce max read size
  fuse: Manually process requests (without libfuse)
  fuse: Drop permission changes in fuse_do_truncate
  block: Move qemu_fcntl_addfl() into osdep.c
  fuse: Explicitly handle non-grow post-EOF accesses
  iotests/308: Use conv=notrunc to test growability
  fuse: fuse_{read,write}: Rename length to blk_len
  fuse: Add halted flag
  fuse: Introduce fuse_{inc,dec}_in_flight()
  fuse: Introduce fuse_{at,de}tach_handlers()
  ...

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

diff --cc meson.build
Simple merge