Robert Evans d0294aa758 Update dnode_next_offset_level to accept blkid instead of offset
Currently this function uses L0 offsets which:
1. is hard to read since it maps offsets to blkid and back each call
2. necessitates dnode_next_block to handle edge cases at limits
3. makes it hard to tell if the traversal can loop infinitely

Instead, update this and dnode_next_offset to work in (blkid, index).
This way the blkid manipulations are clear, and it's also clear that
the traversal always terminates since blkid goes one direction.

I've also considered updating dnode_next_offset to operate on blkid.
Callers use both patterns, so maybe another PR can split the cases?

While here tidy up dnode_next_offset_level comments.

Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Robert Evans <evansr@google.com>
Closes #17792
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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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