[Libguestfs] [libnbd PATCH 0/8] Add nbd_pread_callback

[Eric Blake]

I've mentioned this topic before (in fact, the idea of adding
NBD_CMD_FLAG_DF was first mentioned at [1]), but finally finished
enough of an implementation to feel confident in posting it.

I'd still like to add something under examples/ that uses the new API
to implement strict checking of a server's structured replies read
implementation (ensure that a server never sends data after an error
at the same offset, that it does not send overlapping data, and that
it does not report success unless all of the range is covered).

[1] https://www.redhat.com/archives/libguestfs/2019-May/msg00209.html

Eric Blake (8):
  states: Add state for structured reply completion
  states: Consolidate search for current reply's command
  pread: Reject server SR read response with no data chunks
  states: Prepare for read callback
  states: Wire in a read callback
  states: Add nbd_pread_callback API
  states: Add tests for nbd_pread_callback
  states: Add DF flag support for pread

 .gitignore                          |   1 +
 generator/generator                 | 140 +++++++++++++++++++--
 generator/states-reply-simple.c     |  31 +++--
 generator/states-reply-structured.c | 147 +++++++++++-----------
 generator/states-reply.c            |  31 ++++-
 interop/Makefile.am                 |  11 +-
 interop/structured-read.c           | 182 ++++++++++++++++++++++++++++
 interop/structured-read.sh          |  57 +++++++++
 lib/aio.c                           |   2 +
 lib/flags.c                         |  11 ++
 lib/internal.h                      |  22 +++-
 lib/nbd-protocol.h                  |   1 +
 lib/protocol.c                      |   1 +
 lib/rw.c                            |  51 +++++++-
 python/t/405-pread-callback.py      |  42 +++++++
 tests/oldstyle.c                    |  74 ++++++++++-
 16 files changed, 686 insertions(+), 118 deletions(-)
 create mode 100644 interop/structured-read.c
 create mode 100755 interop/structured-read.sh
 create mode 100644 python/t/405-pread-callback.py

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2.20.1