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Ping QiuandClaude Opus 4.6
ed11a09a61
BUG-CP11A4-1 (HIGH): ImportSnapshot now rejects when active snapshots exist. Import overwrites the extent region that non-CoW'd snapshot blocks read from, which would silently return import data instead of snapshot-time data. New ErrImportActiveSnapshots error and snapMu-guarded check. BUG-CP11A4-2 (HIGH): Double import without AllowOverwrite now correctly rejected. Import bypasses WAL so nextLSN stays at 1; added FlagImported (Superblock.Flags bit 0) set after successful import and checked alongside nextLSN in the non-empty gate. BUG-CP11A4-3 (MED): Replaced fixed exportTempSnapID (0xFFFFFFFE) with atomic sequence counter (exportTempSnapBase + exportTempSnapSeq). Each auto-export gets a unique temp snapshot ID, preventing concurrent export races and user snapshot ID collisions. Also added beginOp()/endOp() lifecycle guards to both ExportSnapshot and ImportSnapshot, and documented the non-atomic import failure semantics. 5 new regression tests + QA-EX-3 rewritten for rejection behavior. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>