Re: [PATCH] new syscall: flink

Jakub Jelinek
2003-04-07T08:24:24Z

On Mon, Apr 07, 2003 at 10:18:00AM +0200, Olivier Galibert wrote:
> On Mon, Apr 07, 2003 at 07:29:35AM +0000, Miquel van Smoorenburg wrote:
> > Can't you just check those permissions, i.e. behave like link() ?
> > If you cant't access the path to the file, don't permit flink() ?
>
> Which path ? A file can have many paths to it, or to the other
> extreme none at all.

There is at most one path associated with an opened file - d_path on
file->f_dentry. If a fd has no path, don't permit flink().
Alternatively, flink() could have 3 arguments, 2 like link and an opened
fd, which would atomically do if fd describes the same object as buf,
link buf to newname.

Jakub