On Tuesday 19 May 2009, Jan Blunck wrote: > On Tue, May 19, Arnd Bergmann wrote: > > This would work, but you'd have to do this for each file system if you want > > to be able to use it as the top of the union while backed by a read-only > > block device or when you don't want it to be written. > > I know that the requirement for the topmost filesystem to be able to create > directories and fill them with fallthrus is an unattractive one. On the other > hand this is the cost that you have to pay at the moment to get this kind of > functionality. This implementation will not help with all use-cases. Its focus > is to get certain use-cases right. So what would go wrong if you only made them persistent for writable file systems, but allowed fallthrough dentries to be discarded for read-only file systems? As long as the lower layers don't change, you should still be able to reconstruct the same dentries every time you do a readdir, right? Arnd <>< -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
