[PATCH v2 0/5] block-copy: make helper APIs thread safe

[Emanuele Giuseppe Esposito <eesposit@redhat.com>]

This serie of patches bring thread safety to the smaller APIs used by
block-copy, namely ratelimit, progressmeter, co-shared-resource
and aiotask.
The end goal is to reduce the usage of AioContexlock in block-copy,
by introducing smaller granularity locks thus on making the block layer
thread safe. 

This serie depends on Paolo's coroutine_sleep API.

What's missing for block-copy to be fully thread-safe is fixing
the CoSleep API to allow cross-thread sleep and wakeup.
Paolo is working on it and will post the patches once his new
CoSleep API is accepted.

Patches 1-3 work on ratelimit (they are also based on the first
ratelimit patch sent by Paolo), 4 covers progressmeter and
5 co-shared-resources.

Based-on: <20210503112550.478521-1-pbonzini@redhat.com>
Based-on: <20210413125533.217440-1-pbonzini@redhat.com>
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
---
v1 -> v2:
* Implement progressmeter as a separate .c file (was just an header),
  but keep the struct public, to avoid heap allocations [Vladimir, Paolo]
* Drop for now the Aiopool patches of v2 [Paolo, Stefan]

Emanuele Giuseppe Esposito (2):
  progressmeter: protect with a mutex
  co-shared-resource: protect with a mutex

Paolo Bonzini (3):
  ratelimit: treat zero speed as unlimited
  block-copy: let ratelimit handle a speed of 0
  blockjob: let ratelimit handle a speed of 0

 block/block-copy.c                | 28 ++++++--------
 block/meson.build                 |  1 +
 block/progress_meter.c            | 64 +++++++++++++++++++++++++++++++
 blockjob.c                        | 46 +++++++++++++---------
 include/qemu/co-shared-resource.h |  4 +-
 include/qemu/progress_meter.h     | 34 ++++++++--------
 include/qemu/ratelimit.h          | 12 +++++-
 job-qmp.c                         |  8 +++-
 job.c                             |  3 ++
 qemu-img.c                        |  9 +++--
 util/qemu-co-shared-resource.c    | 27 ++++++++++---
 11 files changed, 171 insertions(+), 65 deletions(-)
 create mode 100644 block/progress_meter.c

-- 
2.30.2