From: Christian Brauner
> Sent: 10 May 2024 11:55
>
> > For the uapi issue you describe below my take would be that we should just
> > try, and hope that everyone's been dutifully using O_CLOEXEC. But maybe
> > I'm biased from the gpu world, where we've been hammering it in that
> > "O_CLOEXEC or
> For the uapi issue you describe below my take would be that we should just
> try, and hope that everyone's been dutifully using O_CLOEXEC. But maybe
> I'm biased from the gpu world, where we've been hammering it in that
> "O_CLOEXEC or bust" mantra since well over a decade. Really the only valid
On Thu, May 09, 2024 at 08:48:20AM -0700, Linus Torvalds wrote:
> On Thu, 9 May 2024 at 04:39, Christian Brauner wrote:
> >
> > Not worth it without someone explaining in detail why imho. First pass
> > should be to try and replace kcmp() in scenarios where it's obviously
> > not needed or
On Thu, 9 May 2024 at 04:39, Christian Brauner wrote:
>
> Not worth it without someone explaining in detail why imho. First pass
> should be to try and replace kcmp() in scenarios where it's obviously
> not needed or overkill.
Ack.
> I've added a CLASS(fd_raw) in a preliminary patch since we'll
On Wed, May 08, 2024 at 10:14:44AM -0700, Linus Torvalds wrote:
> On Wed, 8 May 2024 at 09:19, Linus Torvalds
> wrote:
> >
> > So since we already have two versions of F_DUPFD (the other being
> > F_DUPFD_CLOEXEC) I decided that the best thing to do is to just extend
> > on that existing naming
On Wed, 8 May 2024 at 09:19, Linus Torvalds
wrote:
>
> So since we already have two versions of F_DUPFD (the other being
> F_DUPFD_CLOEXEC) I decided that the best thing to do is to just extend
> on that existing naming pattern, and called it F_DUPFD_QUERY instead.
>
> I'm not married to the
On Tue, 7 May 2024 at 12:07, Linus Torvalds
wrote:
>
> That example thing shows that we shouldn't make it a FISAME ioctl - we
> should make it a fcntl() instead, and it would just be a companion to
> F_DUPFD.
>
> Doesn't that strike everybody as a *much* cleaner interface? I think
> F_ISDUP would
On Wed, May 08, 2024 at 12:08:57PM +0200, Christian Brauner wrote:
> On Mon, May 06, 2024 at 04:29:44PM +0200, Christian König wrote:
> > Am 04.05.24 um 20:20 schrieb Linus Torvalds:
> > > On Sat, 4 May 2024 at 08:32, Linus Torvalds
> > > wrote:
> > > > Lookie here, the fundamental issue is that
On Wed, May 08, 2024 at 10:32:08AM +0200, Daniel Vetter wrote:
> On Wed, May 08, 2024 at 07:55:08AM +0200, Christian König wrote:
> > Am 07.05.24 um 21:07 schrieb Linus Torvalds:
> > > On Tue, 7 May 2024 at 11:04, Daniel Vetter wrote:
> > > > On Tue, May 07, 2024 at 09:46:31AM -0700, Linus
On Mon, May 06, 2024 at 04:29:44PM +0200, Christian König wrote:
> Am 04.05.24 um 20:20 schrieb Linus Torvalds:
> > On Sat, 4 May 2024 at 08:32, Linus Torvalds
> > wrote:
> > > Lookie here, the fundamental issue is that epoll can call '->poll()'
> > > on a file descriptor that is being closed
Am 08.05.24 um 10:23 schrieb Christian Brauner:
On Tue, May 07, 2024 at 07:45:02PM +0200, Christian König wrote:
Am 07.05.24 um 18:46 schrieb Linus Torvalds:
On Tue, 7 May 2024 at 04:03, Daniel Vetter wrote:
It's really annoying that on some distros/builds we don't have that, and
for gpu
On Wed, May 08, 2024 at 07:55:08AM +0200, Christian König wrote:
> Am 07.05.24 um 21:07 schrieb Linus Torvalds:
> > On Tue, 7 May 2024 at 11:04, Daniel Vetter wrote:
> > > On Tue, May 07, 2024 at 09:46:31AM -0700, Linus Torvalds wrote:
> > >
> > > > I'd be perfectly ok with adding a generic
On Tue, May 07, 2024 at 07:45:02PM +0200, Christian König wrote:
> Am 07.05.24 um 18:46 schrieb Linus Torvalds:
> > On Tue, 7 May 2024 at 04:03, Daniel Vetter wrote:
> > > It's really annoying that on some distros/builds we don't have that, and
> > > for gpu driver stack reasons we _really_ need
On Tue, May 07, 2024 at 12:07:10PM -0700, Linus Torvalds wrote:
> On Tue, 7 May 2024 at 11:04, Daniel Vetter wrote:
> >
> > On Tue, May 07, 2024 at 09:46:31AM -0700, Linus Torvalds wrote:
> >
> > > I'd be perfectly ok with adding a generic "FISAME" VFS level ioctl
> > > too, if this is possibly a
Am 08.05.24 um 09:51 schrieb Michel Dänzer:
On 2024-05-07 19:45, Christian König wrote:
Am 07.05.24 um 18:46 schrieb Linus Torvalds:
Just what are the requirements for the GPU stack? Is one of the file
descriptors "trusted", IOW, you know what kind it is?
Because dammit, it's *so* easy to do.
On 2024-05-07 19:45, Christian König wrote:
> Am 07.05.24 um 18:46 schrieb Linus Torvalds:
>>
>> Just what are the requirements for the GPU stack? Is one of the file
>> descriptors "trusted", IOW, you know what kind it is?
>>
>> Because dammit, it's *so* easy to do. You could just add a core DRM
Am 07.05.24 um 21:07 schrieb Linus Torvalds:
On Tue, 7 May 2024 at 11:04, Daniel Vetter wrote:
On Tue, May 07, 2024 at 09:46:31AM -0700, Linus Torvalds wrote:
I'd be perfectly ok with adding a generic "FISAME" VFS level ioctl
too, if this is possibly a more common thing. and not just DRM
On Tue, 7 May 2024 at 11:04, Daniel Vetter wrote:
>
> On Tue, May 07, 2024 at 09:46:31AM -0700, Linus Torvalds wrote:
>
> > I'd be perfectly ok with adding a generic "FISAME" VFS level ioctl
> > too, if this is possibly a more common thing. and not just DRM wants
> > it.
> >
> > Would something
On Tue, May 07, 2024 at 09:46:31AM -0700, Linus Torvalds wrote:
> On Tue, 7 May 2024 at 04:03, Daniel Vetter wrote:
> >
> > It's really annoying that on some distros/builds we don't have that, and
> > for gpu driver stack reasons we _really_ need to know whether a fd is the
> > same as another,
Am 07.05.24 um 18:46 schrieb Linus Torvalds:
On Tue, 7 May 2024 at 04:03, Daniel Vetter wrote:
It's really annoying that on some distros/builds we don't have that, and
for gpu driver stack reasons we _really_ need to know whether a fd is the
same as another, due to some messy uniqueness
On Tue, 7 May 2024 at 04:03, Daniel Vetter wrote:
>
> It's really annoying that on some distros/builds we don't have that, and
> for gpu driver stack reasons we _really_ need to know whether a fd is the
> same as another, due to some messy uniqueness requirements on buffer
> objects various
On Mon, May 06, 2024 at 04:29:44PM +0200, Christian König wrote:
> Am 04.05.24 um 20:20 schrieb Linus Torvalds:
> > On Sat, 4 May 2024 at 08:32, Linus Torvalds
> > wrote:
> > > Lookie here, the fundamental issue is that epoll can call '->poll()'
> > > on a file descriptor that is being closed
Am 04.05.24 um 20:20 schrieb Linus Torvalds:
On Sat, 4 May 2024 at 08:32, Linus Torvalds
wrote:
Lookie here, the fundamental issue is that epoll can call '->poll()'
on a file descriptor that is being closed concurrently.
Thinking some more about this, and replying to myself...
Actually, I
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