Developer Update on ZFSOnLinux bug

It looks like no data is actually lost. The regression caused us to lose hard links in some directories where new hard links were being made. That means that we can get all of the files back, minus their names and directory paths. There will be a tool integrated into the driver that will let people repair affected systems. The missing files would go into a lost+found directory. Running it also would scan for damage on systems.

There are a couple caveats though. Any snapshots containing damaged directories will need to be destroyed to restore the pool to pristine condition. If anyone cloned those snapshots, the clones will need to be destroyed too (but you can copy data off).

The tool will provide a list of things to destroy that require manual destruction by the system administrator. It is possible to optionally just leave things as is, and nothing bad should happen aside from having an annoying message about the bad snapshots.

I cannot give an exact ETA on when the tool will be ready, but I can say soon. :)