[PATCH v4 00/15] Apply COR-filter to the block-stream permanently

[Andrey Shinkevich <andrey.shinkevich@virtuozzo.com>]

With this series, all the block-stream COR operations pass through
the COR-filter. The patches 01-08/15 are taken from the series
"block: Deal with filters" by Max Reitz, the full version of that
can be found in the branches:

      https://git.xanclic.moe/XanClic/qemu child-access-functions-v6
      https://github.com/XanClic/qemu child-access-functions-v6

      When running iotests, apply "char-socket: Fix race condition"
      to avoid sporadic segmentation faults.
v4:
  01: Initialization of the COR-filter BDRVStateCOR member.

v3:
  01: The COR filter insert/remove functions moved to block/copy-on-read.c
      to be a part of API.
  02: block/stream.c code refactoring.
  03: The separate call to block_job_add_bdrv() is used to block operations
      on the active node after the filter inserted and the job created.
  04: The iotests case 030::test_overlapping_4 was modified to unbound
      the block-stream job from the base node.
  05: The COR driver functions preadv/pwritev replaced with their analogous
      preadv/pwritev_part.

v2:
  01: No more skipping filters while checking for operation blockers.
      However, we exclude filters between the bottom node and base
      because we do not set the operation blockers for filters anymore.
  02: As stated above, we do not set the operation blockers for filters
      anymore. So, skip filters when we block operations for the target
      node.
  03: The comment added for the patch 4/7.
  04: The QAPI target version changed to 5.1.
  05: The 'filter-node-name' now excluded from using in the test #030.
      If we need it no more in a final version of the series, the patch
      5/7 may be removed.
  06: The COR-filter included into the frozen chain of a block-stream job.
      The 'above_base' node pointer is left because it is essential for
      finding the base node in case of filters above.


Andrey Shinkevich (7):
  block: prepare block-stream for using COR-filter
  copy-on-read: Support change filename functions
  copy-on-read: Support preadv/pwritev_part functions
  copy-on-read: add filter append/drop functions
  qapi: add filter-node-name to block-stream
  iotests: prepare 245 for using filter in block-stream
  block: apply COR-filter to block-stream jobs

Max Reitz (8):
  block: Mark commit and mirror as filter drivers
  copy-on-read: Support compressed writes
  block: Add child access functions
  block: Add chain helper functions
  block: Include filters when freezing backing chain
  block: Use CAFs in block status functions
  commit: Deal with filters when blocking intermediate nodes
  block: Use CAFs when working with backing chains

 block.c                        | 275 ++++++++++++++++++++++++++++++++++-------
 block/commit.c                 |  85 ++++++++++---
 block/copy-on-read.c           | 159 ++++++++++++++++++++++--
 block/io.c                     |  19 +--
 block/mirror.c                 |   6 +-
 block/monitor/block-hmp-cmds.c |   4 +-
 block/stream.c                 |  89 +++++++++----
 blockdev.c                     |  19 ++-
 include/block/block.h          |   6 +-
 include/block/block_int.h      |  67 +++++++++-
 qapi/block-core.json           |   6 +
 tests/qemu-iotests/030         |  17 +--
 tests/qemu-iotests/141.out     |   2 +-
 tests/qemu-iotests/245         |  10 +-
 14 files changed, 625 insertions(+), 139 deletions(-)

-- 
1.8.3.1