miscfs/fullfs: add disk-full simulation layerfs based on miscfs/nullfs#76
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miscfs/fullfs: add disk-full simulation layerfs based on miscfs/nullfs#76dalpra-hcd wants to merge 1 commit intoNetBSD:trunkfrom
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sys/dev/hdaudio/hdafg.c: revision 1.33 hdaudio(4): Do not expose non-functional volume controls. The old code supported "volume without mute", but not "mute without volume", which are widely exposed by hdaudio devices. This resulted in redundant volume controls with delta=256 (not allowing them to be set). While here, classify PC speaker and phone out controls as output controls. "ship it" jmcneill@ PR kern/59712 hdaudio driver exposes nonexistent volume controls
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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: