[Libguestfs] [nbdkit PATCH 0/3] Add noparallel filter

Being able to programmatically force nbdkit to be less parallel can be useful during testing. I was less sure about patch 3, but if you like it, I'm inclined to instead squash it into patch 1. This patch is written to apply after my NBD_CMD_CACHE work (since I touched the nocache filter); but can be rearranged if we think this series should go in first while that one undergoes any adjustments from review. Eric Blake (3): server: Allow filters to reduce thread model dynamically noparallel: Implement new filter filters: Use only .thread_model, not THREAD_MODEL docs/nbdkit-filter.pod | 45 ++++++---- filters/fua/nbdkit-fua-filter.pod | 1 + filters/nocache/nbdkit-nocache-filter.pod | 1 + filters/noextents/nbdkit-noextents-filter.pod | 1 + .../noparallel/nbdkit-noparallel-filter.pod | 66 ++++++++++++++ filters/nozero/nbdkit-nozero-filter.pod | 1 + configure.ac | 2 + include/nbdkit-filter.h | 7 +- filters/cow/cow.c | 2 - filters/delay/delay.c | 2 - filters/error/error.c | 2 - filters/fua/fua.c | 2 - filters/log/log.c | 2 - filters/nocache/nocache.c | 2 - filters/noextents/noextents.c | 2 - filters/noparallel/noparallel.c | 85 +++++++++++++++++++ filters/nozero/nozero.c | 2 - filters/offset/offset.c | 2 - filters/partition/partition.c | 2 - filters/rate/rate.c | 2 - filters/readahead/readahead.c | 2 - filters/stats/stats.c | 2 - filters/truncate/truncate.c | 2 - filters/xz/xz.c | 6 +- server/filters.c | 8 +- server/main.c | 10 ++- filters/noparallel/Makefile.am | 61 +++++++++++++ tests/test-eflags.sh | 16 ++++ tests/test-parallel-file.sh | 13 ++- 29 files changed, 296 insertions(+), 55 deletions(-) create mode 100644 filters/noparallel/nbdkit-noparallel-filter.pod create mode 100644 filters/noparallel/noparallel.c create mode 100644 filters/noparallel/Makefile.am -- 2.20.1