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Chris Lu
aabd44fbb5
* fix(tier): preserve volume data modification time * fix(tier): best-effort restore of data mtime on download A failed Chtimes should not abort an otherwise complete tier-down; warn and continue, matching the EC copy path. * fix(tier): preserve volume data mtime in rust volume server Mirror the Go fix: store the source .dat mtime on upload instead of the upload time, and restore it on the downloaded .dat. Without this a tiered-then-restored volume loads last_modified_ts_seconds from the upload/download time, extending its TTL across a restart or remount. * fix(tier): read source mtime via DiskFile.GetStat() GetStat() is nil-safe when the backend is closed concurrently and skips a redundant stat syscall; its cached modTime is the on-disk mtime a reload reads, since every .dat write or Chtimes is followed by a DiskFile (re)open. * fix(tier): surface mtime-restore failures on rust tier-down set_file_mtime now returns io::Result; the tier-down path warns on a failed restore instead of dropping it silently, so a wrong local .dat mtime (and the TTL drift it causes) is observable. Matches the Go download. The EC copy path keeps its best-effort silence.