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

[Eric Blake]

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

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2.20.1