= Journal commit record
A marker identifying a complete committed <file-system transaction>. A marker alone is insufficient if its <journal payload> is missing or belongs to another group. The simple model prevents this through ordering and fresh record identities. Real journal formats also validate record identities and integrity: the <ext4> documentation says replay discards a group lacking its commit or having mismatched integrity checks.<3.6. Journal (jbd2) by The kernel development community>{ref}
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