Differential D56492

p9fs: Move UMA zone initialization to VFS module lifecycle
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Authored by arichardson on Apr 18 2026, 5:56 AM.

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markj

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rG1ed2ef42e017: p9fs: Move UMA zone initialization to VFS module lifecycle

Summary

Previously, the UMA zones required for 9P requests (p9fs_buf_zone,
p9fs_req_zone, etc.) were initialized and destroyed in the
virtio_p9fs transport module. This caused issues when unloading
the core p9fs module.

This change moves p9_init_zones() and p9_destroy_zones() into
p9fs_init() and p9fs_uninit() inside p9fs_vfsops.c so that they
are correctly bound to the VFS filesystem module lifecycle via
vfs_modevent, aligning p9fs with standard FreeBSD VFS semantics.

Found while fixing https://github.com/CTSRD-CHERI/cheribsd/issues/2617.

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rG FreeBSD src repository

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Event Timeline

arichardson created this revision.Apr 18 2026, 5:56 AM

Herald added a subscriber: imp. · View Herald TranscriptApr 18 2026, 5:56 AM

Harbormaster completed remote builds in B72313: Diff 175815.Apr 18 2026, 5:56 AM

arichardson requested review of this revision.Apr 18 2026, 5:56 AM

Herald added a reviewer: cheri. · View Herald TranscriptApr 18 2026, 5:56 AM

Herald added a reviewer: cheri. · View Herald Transcript

arichardson added a parent revision: D56497: virtio_p9fs: Fix kernel panic on module unload.Apr 18 2026, 6:01 AM

arichardson added child revisions: D56495: p9fs: Refactor buffer allocations to avoid zeroing large payloads, D56494: p9fs: Fix creating files with restrictive permissions, D56493: p9fs: implement basic pathconf support.

kib accepted this revision.Apr 18 2026, 7:50 PM

This revision is now accepted and ready to land.Apr 18 2026, 7:50 PM

Closed by commit rG1ed2ef42e017: p9fs: Move UMA zone initialization to VFS module lifecycle (authored by arichardson). · Explain WhyMay 7 2026, 5:03 AM

This revision was automatically updated to reflect the committed changes.

arichardson added a commit: rG1ed2ef42e017: p9fs: Move UMA zone initialization to VFS module lifecycle.

Revision Contents
Changeset List

Path

Size

sys/

dev/

virtio/

p9fs/

3 lines

fs/

p9fs/

4 lines

Diff 177347

sys/dev/virtio/p9fs/virtio_p9fs.c

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sys/fs/p9fs/p9fs_vfsops.c

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