On Thu, Mar 21, 2013 at 04:58:41PM -0700, Linus Torvalds wrote: > And the only other reason we don't want to allow it is to make sure > you can't have directory loops etc, afaik, and again, for this > particular case of /proc, we happen to be ok.
Not really. Do that and yes, this deadlock goes away. But the locking order in general goes to hell - we order directory inodes by "which dentry is an ancestor of another?" So we have no warranty that we won't get alias1/foo/bar/baz < alias2/foo. Take rename_lock() on those two and have it race with rmdir alias2/foo/bar/baz (locks alias2/foo/bar, then alias2/foo/bar/baz) and rmdir alias2/foo/bar (locks alias2/foo and alias2/foo/bar). Oops - we have a cycle now... -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
