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Journaling: Crash Consistency by Write-Ahead Log

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Crash consistency — a single file write touches data, inode, and bitmap; a crash partway through leaves the filesystem corrupt. A write-ahead journal records the intent first, then replays it on reboot so partial writes never become permanent.

journalingcrash consistencywrite-ahead logtransactionatomic commitredo
ForutsetterThe Inode: A File's Map to Its Blocks
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