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vfs/cache: Fix promoteToFast race with WriteCloser Close #23

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Ghost merged 1 commits from vfs/cache-promote-race into develop 2026-09-01 15:35:20 -05:00
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Author SHA1 Message Date
s1d3sw1ped_bot 8e09c89e24 vfs/cache: Fix promoteToFast race with WriteCloser Close
CI / vulncheck (pull_request) Successful in 14s
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CI / check-and-test (pull_request) Successful in 40s
Details 
promoteToFast read FileInfo.Size from Stat after the VFS lock was
released, while WriteCloser.Close updated Size on the same live
object. Concurrent Create/Open on overlapping keys tripped the race
detector.

Stat now returns a FileInfo snapshot, and promotion uses the
ReadAll length for the fast-tier Create size. Promotion stays
best-effort.

#21
 2026-09-01 20:30:40 +00:00