oracular (1) nbdkit-release-notes-1.26.1.gz

NAME

       nbdkit-release-notes-1.26 - release notes for nbdkit 1.26

DESCRIPTION

       These are the release notes for nbdkit stable release 1.26.  This describes the major changes since 1.24.

       nbdkit 1.26.0 was released on 7 June 2021.

       nbdkit is now hosted on gitlab:
       https://listman.redhat.com/archives/libguestfs/2021-February/msg00021.html

   Security
       There were no security issues found.  All past security issues and information about how to report new
       ones can be found in nbdkit-security(1).

   Plugins
       nbdkit-gzip-plugin and nbdkit-tar-plugin have been removed.  They were deprecated in nbdkit 1.22.  The
       functionality has been replaced by nbdkit-gzip-filter(1) and nbdkit-tar-filter(1) respectively.

       nbdkit-streaming-plugin(1) has been deprecated and will be removed in nbdkit 1.30.  You can use
       nbdcopy(1) instead.

       nbdkit-curl-plugin(1) adds these features: "followlocation=false" to disable following redirects.
       "cookiefile" and "cookiejar" to control saving cookies.

       nbdkit-ssh-plugin(1) now advertises multi-conn if the server is OpenSSH, improving performance (Eric
       Blake).

       nbdkit-ondemand-plugin(1) has a new "wait=true" flag allowing you to choose between clients waiting for
       an export to become free or being immediately rejected.

       nbdkit-sparse-random-plugin(1) now does not generate fully random data within each block.  Using perf we
       observed that the plugin was spending 34% of the total time during benchmarks just doing this.  You can
       enable the old behaviour using "random-content=true".

       nbdkit-file-plugin(1) now checks if the file is read-only and exports a read-only NBD connection in this
       case (Eric Blake).

       nbdkit-vddk-plugin(1) has been tested with VDDK 7.0.2.

   Filters
       There is a new API for use by filters to manage "contexts".  Instead of the previous 1-1 relationship
       between filter connections and plugin connections, filters can now open more than one context into the
       backend from a single connection, or share contexts between connections (Eric Blake).

       New nbdkit-multi-conn-filter(1) which allows you to add multi-conn support to plugins which don't support
       it (although the emulation is expensive), or change whether multi-conn is advertised to clients (Eric
       Blake).

       nbdkit-cow-filter(1) now ignores flush/FUA requests (which are not useful for a temporary overlay).  The
       filter now implements extents and efficient trimming.  Fine-grained locking is used around shared
       structures, greatly improving parallel performance.  Added support for multi-conn.

       nbdkit-cache-filter(1) advertises multi-conn when possible (Eric Blake).

       nbdkit-cache-filter and nbdkit-cow-filter can now handle arbitrary sized disks, instead of rounding the
       disk size down.

       nbdkit-blocksize-filter(1) supports parallel requests (Eric Blake).

       nbdkit-checkwrite-filter(1) supports multi-conn (Eric Blake).

       nbdkit-ext2-filter(1) no longer supports multi-conn.  The filter is single-threaded so it does not
       matter, but it was not safe.  Fix trim, zero and flush support (Eric Blake).

       nbdkit-readahead-filter(1) fixes multi-conn support (Eric Blake).

       nbdkit-gzip-filter(1) and nbdkit-xz-filter(1) now both support multi-conn (Eric Blake).

   Language bindings
       nbdkit-python-plugin(3) supports the following new features: "after_fork" and "preconnect" methods.
       "nbdkit.shutdown()" binding.

       nbdkit-rust-plugin(3) updated for newer Rust compiler versions (Alan Somers).

       nbdkit-golang-plugin(3) now uses and requires golang modules.  Golang ≥ 1.13 must be used.

   API
       New ".cleanup" callback for plugins and filters.  This is called shortly before ".unload", but unlike
       ".unload" it is guaranteed that no plugin or filter code has been dlclosed (Eric Blake).

       New "nbdkit_extents_full" is a helper function for filters which can be used to read all extents from a
       plugin covering a region.

   Tests
       Old plugins that we use for testing were rebuilt so they no longer depend on libselinux (thanks Thomas
       Weißschuh).

       nbdkit-ssh-plugin(1) can still be built even if ssh-keygen is unavailable for testing it (thanks Thomas
       Weißschuh).

       Improve tests/test-captive.sh to avoid crashes during testing.

       Test coverage on FreeBSD has been improved, fewer tests should skip unnecessarily.

   Build
       nbdkit and plugins can now be built with -fvisibility=hidden, which allows the compiler to make some
       optimizations.

       Add a dependency so nbdkit is relinked if the linker script (nbdkit.syms) changes (Eric Blake).

       xorriso is now preferred over genisoimage or mkisofs (see https://wiki.debian.org/genisoimage).

       It is now possible to compile nbdkit with clang with warnings enabled.  Several warnings have been
       suppressed or fixed.

       "MALLOC_CHECK_" and "MALLOC_PERTURB_" are only enabled when running the tests, not when running nbdkit
       from the build directory.  This makes it easier to do benchmarks.

       "nbdkit_peer_*" implemented on OpenBSD.

   Internals
       When fuzzing nbdkit we now recommend using the -t 1 flag (which disables threads).  This improves the
       fuzz-stability of nbdkit.

SEE ALSO

       nbdkit(1).

AUTHORS

       Authors of nbdkit 1.26:

       •   Alan Somers

       •   Eric Blake

       •   Michael Ablassmeier

       •   Richard W.M. Jones

       •   Timm Bäder

COPYRIGHT

       Copyright Red Hat

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