[Libguestfs] [nbdkit PATCH 0/9] RFC: implement NBD_CMD_CACHE

[Eric Blake]

I'm still working my way through the filters before this series will
be complete, but this is enough of a start to at least get some
feedback on the idea of implementing another NBD protocol extension.

Eric Blake (9):
  server: Internal hooks for implementing NBD_CMD_CACHE
  plugins: Add .cache callback
  file, split: Implement .cache with posix_fadvise
  nbd: Implement NBD_CMD_CACHE passthrough
  plugins: Implement no-op .cache for in-memory plugins
  sh: Implement .cache script callback
  filters: Add .cache callback
  test-layers: Test .cache usage
  blocksize: Implement .cache rounding

 docs/nbdkit-filter.pod          | 27 ++++++++++++++-
 docs/nbdkit-plugin.pod          | 52 ++++++++++++++++++++++++++++
 docs/nbdkit-protocol.pod        | 10 ++++++
 plugins/sh/nbdkit-sh-plugin.pod | 12 ++++++-
 configure.ac                    |  3 +-
 common/protocol/protocol.h      |  2 ++
 include/nbdkit-filter.h         |  8 +++++
 include/nbdkit-plugin.h         |  2 ++
 server/internal.h               |  4 +++
 filters/blocksize/blocksize.c   | 31 ++++++++++++++++-
 plugins/data/data.c             | 10 ++++++
 plugins/file/file.c             | 22 ++++++++++++
 plugins/full/full.c             | 12 ++++++-
 plugins/memory/memory.c         | 10 ++++++
 plugins/nbd/nbd.c               | 22 ++++++++++++
 plugins/null/null.c             | 12 ++++++-
 plugins/pattern/pattern.c       | 12 ++++++-
 plugins/random/random.c         | 12 ++++++-
 plugins/sh/sh.c                 | 40 ++++++++++++++++++++++
 plugins/split/split.c           | 37 +++++++++++++++++++-
 plugins/streaming/streaming.c   | 11 ++++++
 plugins/zero/zero.c             | 12 ++++++-
 server/filters.c                | 60 ++++++++++++++++++++++++++++++++-
 server/plugins.c                | 39 +++++++++++++++++++++
 server/protocol-handshake.c     | 10 +++++-
 server/protocol.c               | 25 ++++++++++++++
 tests/test-layers-filter.c      | 22 +++++++++++-
 tests/test-layers-plugin.c      | 17 ++++++++++
 tests/test-layers.c             | 36 ++++++++++++++++++++
 tests/test-eflags.sh            | 53 +++++++++++++++--------------
 30 files changed, 587 insertions(+), 38 deletions(-)

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2.20.1