A scan that cannot read a library root found no files there, so every
cataloged file under it was marked missing. Catalog reads all filter on
missing_since IS NULL, so marking is equivalent to deletion from a user's
point of view: the title leaves browse, search and next-up, and playback
answers "Source media file is missing" for media that is intact on disk.
The dead-root protection already existed but only guarded the destructive
operations. protectedConfiguredRoots was computed *after* the marking loop
in scanPaths, and applyScopedScan received the protected set but applied it
only to its force-delete branch. So an unreachable root could not lose its
rows, but could still have its entire catalog hidden until the next
successful scan.
On a CephFS deployment whose per-library subvolume mounts flap, this marked
190 present files missing in a single day — 15% of all missing-flagged rows
were files sitting untouched on disk, some flagged more than 20 hours after
their last write.
Hoist the probe above the marking loop and skip files under an unreachable
or suspect-empty root in both the folder and scoped paths. Pass the
unreachable set to the walked-scope call too: a nested child mount can die
under a healthy parent, and its rows are inside the parent's scope.
An offline root tells us nothing about whether its files exist. The only
safe reading is to leave them alone and let the next good scan decide.
Genuine deletions under a reachable root are unaffected and still marked
and swept on the same schedule as before.
Report the count as ScanResult.MissingSkippedProtected and log it, so an
operator can tell "my library shrank" from "my mount dropped".
Known gap: a suspect-empty *nested child* root under a healthy parent is
still marked missing, because the suspect set is not resolved until after
the walk loop. Unreachable roots — the case observed in production — are
covered.
Quick
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