Differential D57220

nanobsd: Account for metadata overhead in code slice
ClosedPublic
Actions

Authored by jlduran on May 24 2026, 11:00 AM.

Tags

None

Referenced Files

	Unknown Object (File)
	Wed, Aug 19, 7:27 AM

	Unknown Object (File)
	Thu, Aug 13, 1:21 AM

	Unknown Object (File)
	Wed, Aug 12, 8:23 PM

	Unknown Object (File)
	Tue, Aug 11, 6:21 PM

	Unknown Object (File)
	Mon, Aug 10, 2:54 PM

	Unknown Object (File)
	Mon, Aug 10, 11:47 AM

	Unknown Object (File)
	Mon, Aug 10, 9:57 AM

	Unknown Object (File)
	Mon, Aug 10, 9:35 AM

View All 50 Files

Subscribers

Details

Reviewers

Commits

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.

Diff Detail

Repository

rG FreeBSD src repository

Lint

Lint Skipped

Unit

Tests Skipped

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.

Revision Contents
Changeset List

Path

Size

tools/

tools/

nanobsd/

4 lines

Diff 178517

tools/tools/nanobsd/legacy.sh

Loading...