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cam/da: Document what an 'invalid pack' means.
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Authored by imp on Jan 25 2025, 8:10 PM.
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Details

Summary

An 'invalid pack' in the da driver means that the media for the drive is
temproarily missing, pending an action by a third party (eg robot arm or
human inserting a disk pack, etc). We invalidate a pack when the
ASC/ASCQ tells us the media is missing (ASC 0x3a MEDIA MISSING) and for
that brief period of time after a peripheral has been invalidated before
the disk is destroyed. When the pack is invalid, we can't do READ/WRITE
operations to the media, so we fail all outstanding I/O and any new I/O
that comes in when this happens. This is cleared in daopen when we've
repobed the device.

Sponsored by: Netflix

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imp requested review of this revision.Jan 25 2025, 8:10 PM

Just to be sure, DA_FLAG_PACK_INVALID does not mean there is no media. There might be a media, just not one we opened originally.

Clarify comments with mav@'s input.

This revision is now accepted and ready to land.Feb 4 2025, 6:19 PM
This revision was automatically updated to reflect the committed changes.