This somewhat equals the ro mount behaviour of other filesystems, or i.e. the nolog fsck flag on some others.

If you need to do careful recovery or forensics, a journal replay is sometimes not feasible.

Using the following mount option you can make sure that a read only mount is really a read-only mount.

 

mount -t ext4 -o ro,noload /dev/blockdev /mnt/fiddle
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