[PATCH v18 0/4] qcow2: Implement zstd cluster compression method

[Denis Plotnikov]

v18:
   * 04: add quotes to all file name variables [Vladimir] 
   * 04: add Vladimir's comment according to "qemu-io write -s"
         option issue.

v17:
   * 03: remove incorrect comment in zstd decompress [Vladimir]
   * 03: remove "paraniod" and rewrite the comment on decompress [Vladimir]
   * 03: fix dead assignment [Vladimir]
   * 04: add and remove quotes [Vladimir]
   * 04: replace long offset form with the short one [Vladimir]

v16:
   * 03: ssize_t for ret, size_t for zstd_ret [Vladimir]
   * 04: small fixes according to the comments [Vladimir] 

v15:
   * 01: aiming qemu 5.1 [Eric]
   * 03: change zstd_res definition place [Vladimir]
   * 04: add two new test cases [Eric]
         1. test adjacent cluster compression with zstd
         2. test incompressible cluster processing
   * 03, 04: many rewording and gramma fixing [Eric]

v14:
   * fix bug on compression - looping until compress == 0 [Me]
   * apply reworked Vladimir's suggestions:
      1. not mixing ssize_t with size_t
      2. safe check for ENOMEM in compression part - avoid overflow
      3. tolerate sanity check allow zstd to make progress only
         on one of the buffers
v13:
   * 03: add progress sanity check to decompression loop [Vladimir]
     03: add successful decompression check [Me]

v12:
   * 03: again, rework compression and decompression loops
         to make them more correct [Vladimir]
     03: move assert in compression to more appropriate place
             [Vladimir]
v11:
   * 03: the loops don't need "do{}while" form anymore and
         the they were buggy (missed "do" in the beginning)
         replace them with usual "while(){}" loops [Vladimir]
v10:
   * 03: fix zstd (de)compressed loops for multi-frame
         cases [Vladimir]
v9:
   * 01: fix error checking and reporting in qcow2_amend compression type part 
[Vladimir]
   * 03: replace asserts with -EIO in qcow2_zstd_decompression [Vladimir, 
Alberto]
   * 03: reword/amend/add comments, fix typos [Vladimir]

v8:
   * 03: switch zstd API from simple to stream [Eric]
         No need to state a special cluster layout for zstd
         compressed clusters.
v7:
   * use qapi_enum_parse instead of the open-coding [Eric]
   * fix wording, typos and spelling [Eric]

v6:
   * "block/qcow2-threads: fix qcow2_decompress" is removed from the series
      since it has been accepted by Max already
   * add compile time checking for Qcow2Header to be a multiple of 8 [Max, 
Alberto]
   * report error on qcow2 amending when the compression type is actually 
chnged [Max]
   * remove the extra space and the extra new line [Max]
   * re-arrange acks and signed-off-s [Vladimir]

v5:
   * replace -ENOTSUP with abort in qcow2_co_decompress [Vladimir]
   * set cluster size for all test cases in the beginning of the 287 test

v4:
   * the series is rebased on top of 01 "block/qcow2-threads: fix 
qcow2_decompress"
   * 01 is just a no-change resend to avoid extra dependencies. Still, it may 
be merged in separate

v3:
   * remove redundant max compression type value check [Vladimir, Eric]
     (the switch below checks everything)
   * prevent compression type changing on "qemu-img amend" [Vladimir]
   * remove zstd config setting, since it has been added already by
     "migration" patches [Vladimir]
   * change the compression type error message [Vladimir] 
   * fix alignment and 80-chars exceeding [Vladimir]

v2:
   * rework compression type setting [Vladimir]
   * squash iotest changes to the compression type introduction patch 
[Vladimir, Eric]
   * fix zstd availability checking in zstd iotest [Vladimir]
   * remove unnecessry casting [Eric]
   * remove rudundant checks [Eric]
   * fix compressed cluster layout in qcow2 spec [Vladimir]
   * fix wording [Eric, Vladimir]
   * fix compression type filtering in iotests [Eric]

v1:
   the initial series



Denis Plotnikov (4):
  qcow2: introduce compression type feature
  qcow2: rework the cluster compression routine
  qcow2: add zstd cluster compression
  iotests: 287: add qcow2 compression type test

 docs/interop/qcow2.txt           |   1 +
 configure                        |   2 +-
 qapi/block-core.json             |  23 +++-
 block/qcow2.h                    |  20 ++-
 include/block/block_int.h        |   1 +
 block/qcow2-threads.c            | 228 +++++++++++++++++++++++++++++--
 block/qcow2.c                    | 120 ++++++++++++++++
 tests/qemu-iotests/031.out       |  14 +-
 tests/qemu-iotests/036.out       |   4 +-
 tests/qemu-iotests/049.out       | 102 +++++++-------
 tests/qemu-iotests/060.out       |   1 +
 tests/qemu-iotests/061.out       |  34 +++--
 tests/qemu-iotests/065           |  28 ++--
 tests/qemu-iotests/080           |   2 +-
 tests/qemu-iotests/144.out       |   4 +-
 tests/qemu-iotests/182.out       |   2 +-
 tests/qemu-iotests/242.out       |   5 +
 tests/qemu-iotests/255.out       |   8 +-
 tests/qemu-iotests/287           | 167 ++++++++++++++++++++++
 tests/qemu-iotests/287.out       |  70 ++++++++++
 tests/qemu-iotests/common.filter |   3 +-
 tests/qemu-iotests/group         |   1 +
 22 files changed, 732 insertions(+), 108 deletions(-)
 create mode 100755 tests/qemu-iotests/287
 create mode 100644 tests/qemu-iotests/287.out

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2.17.0