[Libguestfs] [libnbd PATCH v4 0/6] NBD 64-bit extensions (libnbd portions, prep work)

This is preliminary work towards enabling 64-bit NBD extensions in libnbd, based on review feedback given by Laszlo and others. The v3 patch series is here: https://listman.redhat.com/archives/libguestfs/2023-May/031617.html This series focuses on patches 1 and 3-6 of v3 (patch 2 from that series was already pushed earlier); there remains more work to do on 7-22 that will follow later. For convenience, I've tagged this as https://repo.or.cz/libnbd/ericb.git/shortlog/refs/tags/exthdr-v4a Comparison to v3 (more notes in individual patches): 001/6:[down] 'internal: Track chunk payload length left' 002/6:[0106] [FC] 'block_status: Refactor array storage' 003/6:[0033] [FC] 'protocol: Add definitions for extended headers' 004/6:[0032] [FC] 'states: Prepare to send 64-bit requests' 005/6:[0137] [FC] 'states: Prepare to receive 64-bit replies' 006/6:[0017] [FC] 'states: Break deadlock if server goofs on extended replies' Eric Blake (6): internal: Track chunk payload length left block_status: Refactor array storage protocol: Add definitions for extended headers states: Prepare to send 64-bit requests states: Prepare to receive 64-bit replies states: Break deadlock if server goofs on extended replies lib/internal.h | 16 ++- lib/nbd-protocol.h | 71 ++++++++--- generator/API.ml | 20 ++-- generator/state_machine.ml | 9 +- generator/states-issue-command.c | 29 +++-- generator/states-reply.c | 109 +++++++++++++---- generator/states-reply-chunk.c | 197 ++++++++++++++++++++----------- lib/rw.c | 17 ++- tests/Makefile.am | 4 + tests/pwrite-extended.c | 108 +++++++++++++++++ .gitignore | 1 + 11 files changed, 448 insertions(+), 133 deletions(-) create mode 100644 tests/pwrite-extended.c base-commit: 10b37a26360c19effec2733449ee5a37439181bf -- 2.41.0