[PATCH v5 0/6] block/rbd: migrate to coroutines and add write zeroes support

[Ilya Dryomov]

This series migrates the qemu rbd driver from the old aio emulation
to native coroutines and adds write zeroes support which is important
for block operations.

To achieve this we first bump the librbd requirement to the already
outdated luminous release of ceph to get rid of some wrappers and
ifdef'ry in the code.

V4->V5:
 - rebase on Kevin's block branch (https://repo.or.cz/qemu/kevin.git block)
   to resolve conflicts with "block/rbd: Add support for rbd image encryption"
   patch

V3->V4:
 - this patch is now rebased on top of current master
 - Patch 1: just mention librbd, tweak version numbers [Ilya]
 - Patch 3: use rbd_get_size instead of rbd_stat [Ilya]
 - Patch 4: retain comment about using a BH in the callback [Ilya]
 - Patch 5: set BDRV_REQ_NO_FALLBACK and silently ignore BDRV_REQ_MAY_UNMAP 
[Ilya]

V2->V3:
 - this patch is now rebased on top of current master
 - Patch 1: only use cc.links and not cc.run to not break
   cross-compiling. [Kevin]
   Since Qemu 6.1 its okay to rely on librbd >= 12.x since RHEL-7
   support was dropped [Daniel]
 - Patch 4: dropped
 - Patch 5: store BDS in RBDTask and use bdrv_get_aio_context() [Kevin]

V1->V2:
 - this patch is now rebased on top of current master with Paolos
   upcoming fixes for the meson.build script included:
    - meson: accept either shared or static libraries if --disable-static
    - meson: honor --enable-rbd if cc.links test fails
 - Patch 1: adjusted to meson.build script
 - Patch 2: unchanged
 - Patch 3: new patch
 - Patch 4: do not implement empty detach_aio_context callback [Jason]
 - Patch 5: - fix aio completion cleanup in error case [Jason]
            - return error codes from librbd
 - Patch 6: - add support for thick provisioning [Jason]
            - do not set write zeroes alignment
 - Patch 7: new patch

Peter Lieven (6):
  block/rbd: bump librbd requirement to luminous release
  block/rbd: store object_size in BDRVRBDState
  block/rbd: update s->image_size in qemu_rbd_getlength
  block/rbd: migrate from aio to coroutines
  block/rbd: add write zeroes support
  block/rbd: drop qemu_rbd_refresh_limits

 block/rbd.c | 406 ++++++++++++++++------------------------------------
 meson.build |   7 +-
 2 files changed, 128 insertions(+), 285 deletions(-)

-- 
2.19.2