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Chris Lu
1c9039d3ac
* fix(seaweed-volume): stop EC shard deletion from phantom .dat on restart On startup load_existing_volumes() scans .vif/.idx entries (not just .dat). For distributed EC, a volume's .vif can be mirrored onto a disk whose .ecx lives on a sibling disk, so the per-disk ecx check is false and the loader falls through to Volume::new, which always creates the .dat if missing -> a phantom 8-byte superblock stub. The store-level prune_incomplete_ec_with_sibling_dat then treats that stub as the authoritative source and deletes the real EC shards on sibling disks. Go guards the same case (disk_location.go: 'Without this guard NewVolume below would create a phantom empty .dat') but only same-disk. Fix A (root cause): in load_existing_volumes, don't create a .dat during load. Skip the entry when there is no local .dat AND the .vif does not reference remote files -- remote-tiered volumes have no local .dat but must still load via the remote path. Uses the robust check_dat_file_exists helper so a transient stat error doesn't skip a real volume. New volumes go through create_volume(). Covers the cross-disk .vif/.ecx split Go's same-disk hasEcxFile() misses. Fix B (defense in depth, Go + Rust): when the EC .vif records no source size (dat_file_size==0), require the sibling .dat to be strictly larger than a bare superblock, so an empty 8-byte stub can't pass the credibility gate. Previously it fell back to SUPER_BLOCK_SIZE, which an 8-byte stub exactly meets. Adds regression tests reproducing the cross-disk lone-.vif phantom and the 8-byte stub gate; updates an existing prune test to use a real collection so its .ecx lookup matches the loaders. * fix(storage): don't create phantom .dat from lone .vif on Go volume load Mirror Fix A on the Go side. loadExistingVolume scans .vif/.idx entries, and for distributed EC a .vif can be mirrored onto a disk whose .ecx is on a sibling disk. The same-disk hasEcxFile() guard does not fire there, so the loader falls through to NewVolume(createDatIfMissing=true) and writes an 8-byte phantom .dat, which the sibling-.dat prune then uses to delete the real EC shards on sibling disks. Skip the entry when there is no local .dat AND the .vif has no remote file (via MaybeLoadVolumeInfo); remote-tiered volumes have no local .dat but must still load. Adds TestLoneVifDoesNotCreatePhantomDat (fails without the guard) and TestRemoteTier_DiskScanLoadsRemoteOnlyVolume (fails if the guard skips a remote-only volume).