[Libguestfs] [PATCH v3 0/6] NBD 64-bit extensions (spec only)

v2 was here: https://lists.debian.org/nbd/2022/11/msg00030.html The bulk of the changes since then are: - forbid NBD_OPT_EXPORT_NAME once extended headers are negotiated (Wouter) - consistently use 'maximum payload', rather than a haphazard mix of 'maximum block payload' (Vladimir) At this point, I want to make sure we are happy with the spec before re-posting patches for qemu and libnbd (there were some slight tweaks to the spec compared to v2, which will be easy enough to code, but I want to make sure there won't be any other tweaks needed based on review comments to this proposal). I could still be persuaded that if extended headers are negotiated, then the server should ONLY send back 64-bit block status replies (as written here, and as I implemented in v2 patches for qemu and libnbd, I specified that the server can choose either 32- or 64-bit replies, based on what fits best, and regardless of whether the client made a request with effect length less than 32 bits; clients must therefore be prepared to handle both types of replies). I'm still not sure whether patch 6 is desirable; it didn't get any feedback in my v2 posting. In relation to v2, the subject line for patch 2 changed (the 'git backport-diff' tool doesn't handle that well), and the interdiff changes look bigger than they really are due to reflowed paragraphs. [----] : patches are identical [####] : number of functional differences between upstream/downstream patch [down] : patch is downstream-only The flags [FC] indicate (F)unctional and (C)ontextual differences, respectively 001/6:[----] [-C] 'spec: Recommend cap on NBD_REPLY_TYPE_BLOCK_STATUS length' 002/6:[down] 'spec: Change maximum block size to maximum payload size' 003/6:[0237] [FC] 'spec: Add NBD_OPT_EXTENDED_HEADERS' 004/6:[----] [-C] 'spec: Allow 64-bit block status results' 005/6:[----] [-C] 'spec: Introduce NBD_FLAG_BLOCK_STATUS_PAYLOAD' 006/6:[0062] [FC] 'RFC: spec: Introduce NBD_REPLY_TYPE_OFFSET_HOLE_EXT' Eric Blake (6): spec: Recommend cap on NBD_REPLY_TYPE_BLOCK_STATUS length spec: Change maximum block size to maximum payload size spec: Add NBD_OPT_EXTENDED_HEADERS spec: Allow 64-bit block status results spec: Introduce NBD_FLAG_BLOCK_STATUS_PAYLOAD RFC: spec: Introduce NBD_REPLY_TYPE_OFFSET_HOLE_EXT doc/proto.md | 738 ++++++++++++++++++++++++++++++++++++++------------- 1 file changed, 549 insertions(+), 189 deletions(-) base-commit: fd2c5a60e36ef0ea0d7fd6f8a6bd908d24d5801d -- 2.39.2