buzzingwires 5f7253ca11 Refactor zhack label repair and fix -c regression on nonzero TXG
This commit fixes a likely regression introduced by 64db435 where the
checksum repair functionality (`-c` or default behavior) will perform
checks and access data associated with the newer undetach (`-u`)
functionality, resulting in a failure when an uberblock's TXG is not 0
as required by `-u` but not `-c`

Additionally, code is refactored for better separation of tasks.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: buzzingwires <buzzingwires@outlook.com>
Closes #17732
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OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community. This repository contains the code for running OpenZFS on Linux and FreeBSD.

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Official Resources

Installation

Full documentation for installing OpenZFS on your favorite operating system can be found at the Getting Started Page.

Contribute & Develop

We have a separate document with contribution guidelines.

We have a Code of Conduct.

Release

OpenZFS is released under a CDDL license. For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported Linux kernel versions.
  • Supported FreeBSD versions are any supported branches and releases starting from 13.0-RELEASE.
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