Manpages

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 The functionality has been replaced by nbdkit-gzip-filter(1) and nbdkit-tar-filter(1) respectively.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.