Re: [PATCH 2/3] fd/locks: allow get the lock owner by F_OFD_GETLK

[Matthew Wilcox]

On Tue, Jun 20, 2023 at 06:47:31PM +0500, stsp wrote:
> 
> 20.06.2023 18:46, Matthew Wilcox пишет:
> > On Tue, Jun 20, 2023 at 06:39:07PM +0500, stsp wrote:
> > > Though it will, for sure, represent the
> > > task that _owns_ the lock.
> > No, it *DOESN'T*.  I can open a file, SCM_RIGHTS pass it to another task
> > and then exit.  Now the only owner of that lock is the recipient ...
> Won't I get the recipient's pid in an
> l_pid then?

You snipped the part where I pointed out that at times there can be
_no_ task that owns it.  open a fd, set the lock, pass the fd to another
task, exit.  until that task calls recvmsg(), no task owns it.