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miscfs/fullfs: add disk-full simulation layerfs based on miscfs/nullfs#76

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dalpra-hcd wants to merge 1 commit intoNetBSD:trunkfrom
dalpra-hcd:implement-fullfs
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miscfs/fullfs: add disk-full simulation layerfs based on miscfs/nullfs#76
dalpra-hcd wants to merge 1 commit intoNetBSD:trunkfrom
dalpra-hcd:implement-fullfs

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@dalpra-hcd dalpra-hcd commented Mar 13, 2026

Added fullfs, a filesystem based on nullfs that simulates a full disk.

Operations that allocates space fail with ENOSPC, remaining behave similar to nullfs (bypass).
Also it returns no available space remaining.

Includes kernel module, mount_full(8) and ATF tests.

Validated by running in a VM:

fullfs-test-table fullfs-df-test fullfs-atf-test

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