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

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(-) -- 2.9.3