zfs-2.3.0-rc4 patchset #16760

[behlendorf]

Motivation and Context

Initial proposed patchset for zfs-2.3.0-rc4.

Description

Bug fixes, build fixes, ZTS updates.

How Has This Been Tested?

Clean backports from master. Will be retested by the CI.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [x] Performance enhancement (non-breaking change which improves efficiency)
• [x] Code cleanup (non-breaking change which makes code smaller or more readable)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Library ABI change (libzfs, libzfs_core, libnvpair, libuutil and libzfsbootenv)
• [x] Documentation (a change to man pages or other documentation)

[satmandu]

Could we get https://github.com/openzfs/zfs/pull/16770 in this as well??