On Wed, Jul 23, 2025 at 05:58:01PM +0000, Viacheslav Dubeyko wrote:
> So, this line simply copies CNID from old_dentry->d_fsdata to
> new_dentry->d_fsdata during the rename operation. I assume that
> ->fs_data should be untouched by generic logic of dentries processing.
Yes, I understand that; what I do not understand is why. Why would
the CNID of renamed object be slapped on dentry of removed target?
I'm trying to understand the logics with link(2) and unlink-of-opened
in that code...
Incidentally, what happens if you
fd = creat("foo", 0666);
write(fd, "foo", 3);
link("foo", "bar");
unlink("bar");
close(fd);
The games with S_DEAD in there look odd...
