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EXT4 Deprecates Its Journaled "data=journal" Mode (www.phoronix.com)

submitted 1 day ago by cm0002@toast.ooo to c/linux@programming.dev

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The EXT4 file-system today deprecated its journaled mode of the "data=journal" mount option. Following its deprecation, this mode is planned for removal in the year 2028.

The data=journal mode for EXT4 is where all file data and metadata is written to the file-system's journal before being committed to the main file-system. In the event of a crash or power loss, the journal can then be replayed to recover the data.

The EXT4 data=journal mode is great for those very concerned about data integrity and safety but comes with significant hits to the write performance compared to the default ordered (data=ordered) mode or data=writeback. Using the journaled mode also disables delayed allocation and Direct I/O support.

EXT4 journal deprecated

Per today's Git merge for Linux 7.3, the EXT4 data=journal feature is deprecated and support for it will be removed in early 2028 following the 2027 Linux LTS kernel version.

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[–] ramius345@sh.itjust.works 2 points 1 day ago

Reading through the phoronix comments, its default mode journals file metadata only instead of all writes.