Comment 7 for bug 41624

Matthew Garrett writes ("[Bug 41624] Re: aggressive volume discovery => data loss"):
> NTFS is journalling, but Linux doesn't replay it. I don't think Linux
> has any way to support flagging parts of the buffer cache as "writable
> but non-flushable" - it might be a reasonably elegant way of working,
> but it's also possible for the journal to be relatively large compared
> to the filesystem size.

Then it can't mount devices read only and should say ENOSYS or some
such. Indeed, ideally, the block device would be opened in a way
that would prevent the fs from accidentally writing.

Ian.