[PATCH 0/9] More truncate improvements

[Eric Blake]

Based-on: <address@hidden>
[PATCH v7 00/10] block: Fix resize (extending) of short overlays

After reviewing Kevin's work, I questioned if we had a redundancy with
bdrv_has_zero_init_truncate.  It turns out we do, and this is the result.

Patch 1 has been previously posted [1] and reviewed, the rest is new.
I did not address Neils' comment that modern gluster also always
0-initializes [2], as I am not set up to verify it (my changes to the
other drivers are semantic no-ops, so I don't feel as bad about
posting them with less rigourous testing).

[1] https://lists.gnu.org/archive/html/qemu-devel/2020-01/msg08070.html
[2] https://lists.gnu.org/archive/html/qemu-devel/2020-02/msg04266.html

Eric Blake (9):
  gluster: Drop useless has_zero_init callback
  file-win32: Support BDRV_REQ_ZERO_WRITE for truncate
  nfs: Support BDRV_REQ_ZERO_WRITE for truncate
  rbd: Support BDRV_REQ_ZERO_WRITE for truncate
  sheepdog: Support BDRV_REQ_ZERO_WRITE for truncate
  ssh: Support BDRV_REQ_ZERO_WRITE for truncate
  parallels: Rework truncation logic
  vhdx: Rework truncation logic
  block: Drop unused .bdrv_has_zero_init_truncate

 include/block/block.h     |  1 -
 include/block/block_int.h |  7 ---
 block.c                   | 21 ---------
 block/file-posix.c        |  1 -
 block/file-win32.c        |  4 +-
 block/gluster.c           | 14 ------
 block/nfs.c               |  4 +-
 block/parallels.c         | 23 ++++++----
 block/qcow2.c             |  1 -
 block/qed.c               |  1 -
 block/raw-format.c        |  6 ---
 block/rbd.c               |  4 +-
 block/sheepdog.c          |  4 +-
 block/ssh.c               |  5 ++-
 block/vhdx.c              | 89 ++++++++++++++++++++++-----------------
 15 files changed, 80 insertions(+), 105 deletions(-)

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2.26.2