> Except that we don't know which directory should be locked. Alan,
> original implementation (in BSD) followed links on every operation.
I dont see the problem. You follow the link. At that point you worry about
creating an object. The race there is a userspace issue.
> except that one. Notice that O_EXCL is different: plain O_CREAT applied to
> a normal symlink will happily open the targt, with O_EXCL it will return
> -EEXIST. IOW, in case of O_EXCL we are asking for a different behaviour
> which happens to prohibit following broken links for a different reason.
> It doesn't remove the reasons for doing the same without O_EXCL.
Compatibility, history, not breaking emacs..
> In other words, in that case POSIX draft is broken and we would be
> better off fixing that bug instead of casting it in stone. Behaviour in
> question is inconsistent with every other case when links are
> created/removed/renamed.
You might want to take that up with the relevant posix committee then
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