On Tue, Nov 17, 2009 at 07:18:26PM +0000, David Woodhouse wrote: > On Tue, 2009-11-17 at 14:13 -0500, Valerie Aurora wrote: > > > > I can't think of a way to do it without using up namespace - but > > perhaps there is some part of the symlink target namespace that has no > > valid meaning that we could use instead, like Arnd's self symlink. > > I think it's impossible to declare that, since the symlink namespace is > fair game for userspace do use as it sees fit. > > Emacs and Mozilla lockfiles being but one example... > > [dwmw2@macbook ~]$ ls -l .#foo.html .mozilla/firefox/b8v9tyu0.default/lock > lrwxrwxrwx. 1 dwmw2 dwmw2 44 2009-11-17 19:16 .#foo.html -> dwmw2@xxxxxxxxxxxxxxxxxxxxxxxxxxx:1258450900 > lrwxrwxrwx. 1 dwmw2 dwmw2 19 2009-11-17 09:51 .mozilla/firefox/b8v9tyu0.default/lock -> 90.155.92.212:+3756 > > I wouldn't want to bet that no userspace app has ever come up with the > idea of using a symlink-to-self as a marker for something. I don't think > it's good practice for us to be trying to play games like that. That's my feeling too. I don't see anyway to cleanly implement fallthrus (or whiteouts) without explicit support from the file system on the writable layer. Fortunately it doesn't take much support. -VAL -- 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
