Differential D57220

nanobsd: Account for metadata overhead in code slice
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Authored by jlduran on May 24 2026, 11:00 AM.

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rGdadbbccd8049: nanobsd: Account for metadata overhead in code slice

Summary

The code slice size (CODE_SIZE) includes 16 sectors reserved for disk
metadata (see bsdlabel(8) offset). Subtract these 16 sectors from the
total size passed to nano_makefs.

This prevents the generated filesystem from consuming the entire slice
allocation, ensuring there is enough space for the metadata without
overflowing the partition boundary.

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rG FreeBSD src repository

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Build Status

Buildable 73403
Build 70286: arc lint + arc unit

Event Timeline

jlduran created this revision.May 24 2026, 11:00 AM

Herald added a subscriber: imp. · View Herald TranscriptMay 24 2026, 11:00 AM

jlduran requested review of this revision.May 24 2026, 11:00 AM

Harbormaster completed remote builds in B73403: Diff 178517.May 24 2026, 11:00 AM

jlduran added a parent revision: D57219: nanobsd: Use rounded sizes for cfg and data slices.May 24 2026, 11:00 AM

jlduran added a child revision: D57221: nanobsd: Offset code partition to a track boundary.

ok, but maybe 16 is better encoded as a variable name.

This revision is now accepted and ready to land.May 24 2026, 11:27 PM

In D57220#1311210, @imp wrote:

ok, but maybe 16 is better encoded as a variable name.

Yes, will do!

Closed by commit rGdadbbccd8049: nanobsd: Account for metadata overhead in code slice (authored by jlduran). · Explain WhyMay 27 2026, 12:37 AM

This revision was automatically updated to reflect the committed changes.

jlduran added a commit: rGdadbbccd8049: nanobsd: Account for metadata overhead in code slice.

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tools/

tools/

nanobsd/

4 lines

Diff 178517

tools/tools/nanobsd/legacy.sh

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