[Libguestfs] [nbdkit PATCH 0/5] Add WRITE_ZEROES support

[Eric Blake]

The upstream protocol recently promoted NBD_CMD_WRITE_ZEROES from
experimental to a documented extension. Exposing support for this
allows plugin writers to create sparse files when driven by a
client that knows how to use the extension; meanwhile, even if a
plugin does not support this extension, the server benefits from
less network traffic from the client.

Eric Blake (5):
  protocol: Support NBD_FLAG_NO_ZEROES
  protocol: Validate request flags
  plugins: Add callback for writing zeroes
  protocol: Implement NBD_CMD_WRITE_ZEROES
  file: Support punching holes for write zero

 docs/nbdkit-plugin.pod  | 19 +++++++++++++++++++
 include/nbdkit-plugin.h |  1 +
 plugins/file/file.c     | 32 +++++++++++++++++++++++++++++++
 src/connections.c       | 47 +++++++++++++++++++++++++++++++++++++++++-----
 src/internal.h          |  1 +
 src/plugins.c           | 50 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/protocol.h          | 18 +++++++++++-------
 7 files changed, 156 insertions(+), 12 deletions(-)

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2.9.3