[Libguestfs] [nbdkit PATCH 0/4] Fix truncate handling of real_size

[Eric Blake]

While working on adding assertions to pthread_mutex_lock calls, I
noticed that the truncate filter's use of mutex didn't really protect
us, and isn't really necessary. Cleaning that up also spotted a couple
of other potential cleanups.

Eric Blake (4):
  filters: Drop useless .open callbacks
  truncate: Fix corruption when plugin changes per-connection size
  truncate: Test for safe multi-connect size handling
  doc: More details on (lack of) dynamic sizing

 docs/nbdkit-plugin.pod      |   9 ++
 filters/cache/cache.c       |  10 ---
 filters/error/error.c       |  10 ---
 filters/truncate/truncate.c | 162 +++++++++++++++++++-----------------
 tests/Makefile.am           |   2 +
 tests/test-truncate4.sh     |  85 +++++++++++++++++++
 6 files changed, 183 insertions(+), 95 deletions(-)
 create mode 100755 tests/test-truncate4.sh

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2.20.1