* volume: refuse a tier upload whose .dat grew during the copy
AttachRemoteDatFile only checked that the data backend was still the one
copied, so a needle write acknowledged after the copy read the .dat was
missing from the remote object, and the upload then switched reads to it
and removed the local .dat. Compare the .dat size with the copy under the
same data-file locks; on a mismatch the handler deletes the copy and keeps
the local file.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* seaweed-volume: refuse a tier upload whose .dat grew during the copy
Mirror the Go AttachRemoteDatFile check. The tier-up attach took the
write lease only inside each step, so a needle write acknowledged after
the upload read the .dat was missing from the object the volume then
switched to, and the local .dat holding it was removed. Hold one write
lease across the instance, revision and size checks, the remote-file
update, the .vif save and the backend swap, as tier-down does; a size
mismatch aborts, deleting the object and keeping the local .dat.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
* volume: compare the physical .dat size before a tier attach
DiskFile pads its size past an unaligned tail, which a read-only load
keeps, while the upload copies the physical bytes. Stat the file itself
so such a volume is not refused as written during the copy.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
