[Qemu-devel] [PATCH for 2.10 00/17] Block layer thread safety, part 1

[Paolo Bonzini <pbonzini@redhat.com>]

This series uses mutexes or atomic operations around core block layer
operations.  The remaining parts include:

- drivers, though most of them are already thread safe (part 2, 8 patches,
  depends on Kevin's conversion of QED to coroutines)

- block jobs, before-write notifiers, the write threshold mechanism,
  snapshots, replication, key management (part 3, 16 patches)

- devices (virtio-blk/virtio-scsi, part 4, 5 patches)

Once these four parts are done the AioContext lock can be removed
together with all temporary workarounds that have accumulated.

Paolo

Paolo Bonzini (17):
  block: access copy_on_read with atomic ops
  block: access quiesce_counter with atomic ops
  block: access io_limits_disabled with atomic ops
  block: access serialising_in_flight with atomic ops
  block: access wakeup with atomic ops
  block: access io_plugged with atomic ops
  throttle-groups: do not use qemu_co_enter_next
  throttle-groups: protect throttled requests with a CoMutex
  util: add stats64 module
  block: use Stat64 for wr_highest_offset
  block: access write_gen with atomics
  block: protect tracked_requests and flush_queue with reqs_lock
  coroutine-lock: introduce qemu_co_mutex_lock_unlock
  block: optimize access to reqs_lock
  block: introduce dirty_bitmap_mutex
  block: protect modification of dirty bitmaps with a mutex
  block: make accounting thread-safe

 block.c                        |  10 +-
 block/accounting.c             |  15 +++
 block/block-backend.c          |   5 +-
 block/dirty-bitmap.c           | 125 ++++++++++++++++++++++--
 block/io.c                     |  70 +++++++++-----
 block/mirror.c                 |  14 ++-
 block/nfs.c                    |   4 +-
 block/qapi.c                   |   2 +-
 block/sheepdog.c               |   3 +-
 block/throttle-groups.c        |  76 +++++++++++++--
 block/write-threshold.c        |  37 ++++----
 blockdev.c                     |  46 ++-------
 include/block/accounting.h     |   8 +-
 include/block/block.h          |   5 +-
 include/block/block_int.h      |  63 ++++++++-----
 include/block/dirty-bitmap.h   |  23 ++++-
 include/qemu/coroutine.h       |   6 ++
 include/qemu/stats64.h         | 210 +++++++++++++++++++++++++++++++++++++++++
 include/sysemu/block-backend.h |  10 +-
 migration/block.c              |   6 --
 util/Makefile.objs             |   1 +
 util/qemu-coroutine-lock.c     |  36 +++++++
 util/stats64.c                 | 135 ++++++++++++++++++++++++++
 23 files changed, 763 insertions(+), 147 deletions(-)
 create mode 100644 include/qemu/stats64.h
 create mode 100644 util/stats64.c

-- 
2.9.3