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

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(-) -- 2.20.1