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charliehess / crash-safe-write-file Goto Github PK
View Code? Open in Web Editor NEWWrites a file atomically, plus fsync to flush contents
License: MIT License
Writes a file atomically, plus fsync to flush contents
License: MIT License
According to Dan Luu's article (https://danluu.com/deconstruct-files/), this rename method is not 100% crash safe.
This trick doesn't work. People seem to think that this is safe becaus the POSIX spec says that rename is atomic, but that only means rename is atomic with respect to normal operation, that doesn't mean it's atomic on crash. This isn't just a theoretical problem; if we look at mainstream Linux filesystems, most have at least one mode where rename isn't atomic on crash. Rename also isn't guaranteed to execute in program order, as people sometimes expect.
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