[PATCH v3 00/12] qcow2: make subclusters discardable

[Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>]

v2: https://lists.nongnu.org/archive/html/qemu-devel/2024-05/msg02396.html

v2 -> v3:
  * Added patch 12/12 "qcow2: add discard-subclusters option" which
    makes subcluster-based discards optional;
  * Added a bunch of R-b's.

Andrey Drobyshev (12):
  qcow2: make function update_refcount_discard() global
  qcow2: simplify L2 entries accounting for discard-no-unref
  qcow2: put discard requests in the common queue when discard-no-unref
    enabled
  block/file-posix: add trace event for fallocate() calls
  iotests/common.rc: add disk_usage function
  iotests/290: add test case to check 'discard-no-unref' option behavior
  qcow2: add get_sc_range_info() helper for working with subcluster
    ranges
  qcow2: zeroize the entire cluster when there're no non-zero
    subclusters
  qcow2: make subclusters discardable
  qcow2: zero_l2_subclusters: fall through to discard operation when
    requested
  iotests/271: add test cases for subcluster-based discard/unmap
  qcow2: add discard-subclusters option

 block/file-posix.c           |   1 +
 block/qcow2-cluster.c        | 346 ++++++++++++++++++++++++++++-------
 block/qcow2-refcount.c       |   8 +-
 block/qcow2-snapshot.c       |   6 +-
 block/qcow2.c                |  44 +++--
 block/qcow2.h                |   8 +-
 block/trace-events           |   1 +
 tests/qemu-iotests/250       |   5 -
 tests/qemu-iotests/271       |  74 ++++++--
 tests/qemu-iotests/271.out   |  69 ++++++-
 tests/qemu-iotests/290       |  34 ++++
 tests/qemu-iotests/290.out   |  28 +++
 tests/qemu-iotests/common.rc |   6 +
 13 files changed, 513 insertions(+), 117 deletions(-)

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2.39.3