Re: UTF-8 and case-insensitivity

Helge Hafting
2004-02-19T18:57:01Z

On Thu, Feb 19, 2004 at 08:54:51AM -0800, Linus Torvalds wrote:
>
>
> On Thu, 19 Feb 2004, Jamie Lokier wrote:
> > Linus Torvalds wrote:
> > > For example, the rule can be that _any_ regular dentry create will
> > > invalidate all the "case-insensitive" dentries. Just to be simple about
> > > it.
> >
> > If that's the rule, then with exactly the same algorithmic efficiency,
> > readdir+dnotify can be used to maintain the cache in userspace
> > instead. There is nothing gained by using the helper module in that case.
>
> Wrong.
>
> Because the dnotify would trigger EVEN FOR SAMBA OPERATIONS.
>
> Think about it. Think about samba doing a "rename()" within the directory.

Avoiding its own operations is a nice one. Could dnotify pass
some information, such as the inode number involved to samba?
samba could then look up the filename in its cache and take a
closer look at that file only. That would avoid loosing the cache,
even in case of other processes intruding.

Helge Hafting