On Fri, Aug 09, 2024 at 11:50:30AM +1000, Dave Chinner wrote: > You'll need someone who actually knows what metadata ext4 needs to > modify directly on read-only mounts to tell you exactly what the > mount is modifying and whether or not it should actually be doing > that or not. However, I personally wouldn't consider this behaviour > a bug if it necessary to allow read-only mounts on read-only block > devices to work reliably... Modifying page cache without dirtying is in general a bug. On a block device we'll mostly get away with it, but it still is asking for trouble later. So this probably still warrants fixing, but as Dave said it isn't exactly a grave bug.
