[PATCH v7 00/10] block: Fix resize (extending) of short overlays

[Kevin Wolf <kwolf@redhat.com>]

v7:
- Allocate smaller zero buffer [Vladimir]
- Added missing error_setg_errno() [Max]
- Code cleanup in the iotest, enabled mapping for 'metadata' [Vladimir]
- Don't assign to errp twice [Eric]

v6:
- qcow2: Don't round up end offset [Eric]
- qcow2: Use different error messages for different error paths
- Request BDRV_REQ_ZERO_WRITE only if the backing file actually covers
  (part of) the new area (fix regression from v3) [Max]
- New patch: Forward ZERO_WRITE flag for full preallocation [Max]

v5:
- Fixed file-win32 [Patchew]
- Fixed zeroing in qcow2 for unaligned requests + tests [Vladimir]
- Made raw-format code more consistent [Eric]
- Leave output for existing iotests cases unchanged [Vladimir]

v4:
- Rewrote the series to move the actual zeroing to the block drivers so
  that error paths can work correctly and potentially long-running
  fallback to writing explicit zeroes is avoided.
- Fixed output filtering order in the test case [Max]

v3:
- Don't allow blocking the monitor for a zero write in block_resize
  (even though we can already blockfor other reasons there). This is
  mainly responsible for the increased complexity compared to v2.
  Personally, I think this is not an improvement over v2, but if this is
  what it takes to fix a corruption issue in 4.2... [Max]
- Don't use huge image files in the test case [Vladimir]

v2:
- Switched order of bs->total_sectors update and zero write [Vladimir]
- Fixed coding style [Vladimir]
- Changed the commit message to contain what was in the cover letter
- Test all preallocation modes
- Test allocation status with qemu-io 'map' [Vladimir]

Kevin Wolf (10):
  block: Add flags to BlockDriver.bdrv_co_truncate()
  block: Add flags to bdrv(_co)_truncate()
  block-backend: Add flags to blk_truncate()
  qcow2: Support BDRV_REQ_ZERO_WRITE for truncate
  raw-format: Support BDRV_REQ_ZERO_WRITE for truncate
  file-posix: Support BDRV_REQ_ZERO_WRITE for truncate
  block: truncate: Don't make backing file data visible
  iotests: Filter testfiles out in filter_img_info()
  iotests: Test committing to short backing file
  qcow2: Forward ZERO_WRITE flag for full preallocation

 include/block/block.h          |   5 +-
 include/block/block_int.h      |  10 +-
 include/sysemu/block-backend.h |   2 +-
 block.c                        |   3 +-
 block/block-backend.c          |   4 +-
 block/commit.c                 |   4 +-
 block/crypto.c                 |   7 +-
 block/file-posix.c             |   6 +-
 block/file-win32.c             |   2 +-
 block/gluster.c                |   1 +
 block/io.c                     |  43 +++++-
 block/iscsi.c                  |   2 +-
 block/mirror.c                 |   2 +-
 block/nfs.c                    |   3 +-
 block/parallels.c              |   6 +-
 block/qcow.c                   |   4 +-
 block/qcow2-cluster.c          |   2 +-
 block/qcow2-refcount.c         |   2 +-
 block/qcow2.c                  |  73 +++++++--
 block/qed.c                    |   3 +-
 block/raw-format.c             |   6 +-
 block/rbd.c                    |   1 +
 block/sheepdog.c               |   4 +-
 block/ssh.c                    |   2 +-
 block/vdi.c                    |   2 +-
 block/vhdx-log.c               |   2 +-
 block/vhdx.c                   |   6 +-
 block/vmdk.c                   |   8 +-
 block/vpc.c                    |   2 +-
 blockdev.c                     |   2 +-
 qemu-img.c                     |   2 +-
 qemu-io-cmds.c                 |   2 +-
 tests/test-block-iothread.c    |   9 +-
 tests/qemu-iotests/iotests.py  |   5 +-
 tests/qemu-iotests/274         | 155 +++++++++++++++++++
 tests/qemu-iotests/274.out     | 268 +++++++++++++++++++++++++++++++++
 tests/qemu-iotests/group       |   1 +
 37 files changed, 597 insertions(+), 64 deletions(-)
 create mode 100755 tests/qemu-iotests/274
 create mode 100644 tests/qemu-iotests/274.out

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2.25.3