On Sat, Sep 30, 2023 at 09:50:41AM -0500, Steve French wrote:
> On Fri, Sep 29, 2023 at 3:06 AM David Howells via samba-technical
> wrote:
> >
> >
> > Jeff Layton wrote:
> >
> > > Correct. We'd lose some fidelity in currently stored timestamps, but as
> > > Linus and Ted pointed out, anything bel
On Thu, 28 Sept 2023 at 20:50, Amir Goldstein wrote:
>
> OTOH, it is perfectly fine if the vfs wants to stop providing sub 100ns
> services to filesystems. It's just going to be the fs problem and the
> preserved pre-historic/fine-grained time on existing files would only
> need to be provided in
On Fri, Sep 29, 2023 at 3:06 AM David Howells via samba-technical
wrote:
>
>
> Jeff Layton wrote:
>
> > Correct. We'd lose some fidelity in currently stored timestamps, but as
> > Linus and Ted pointed out, anything below ~100ns granularity is
> > effectively just noise, as that's the floor overh
On Thu, Sep 28, 2023 at 8:19 PM Darrick J. Wong wrote:
>
> On Thu, Sep 28, 2023 at 01:06:03PM -0400, Jeff Layton wrote:
> > On Thu, 2023-09-28 at 11:48 -0400, Arnd Bergmann wrote:
> > > On Thu, Sep 28, 2023, at 07:05, Jeff Layton wrote:
> > > > This shaves 8 bytes off struct inode, according to pa
On Thu, 2023-09-28 at 07:05 -0400, Jeff Layton wrote:
> This shaves 8 bytes off struct inode, according to pahole.
>
> Signed-off-by: Jeff Layton
> ---
> include/linux/fs.h | 32 +++-
> 1 file changed, 23 insertions(+), 9 deletions(-)
>
> diff --git a/include/linux/f
> It is a lot of churn though.
I think that i_{a,c,m}time shouldn't be accessed directly by
filesystems same as no filesystem should really access i_{g,u}id which
we also provide i_{g,u}id_{read,write}() accessors for. The mode is
another example where really most often should use helpers because
Jeff Layton wrote:
> Correct. We'd lose some fidelity in currently stored timestamps, but as
> Linus and Ted pointed out, anything below ~100ns granularity is
> effectively just noise, as that's the floor overhead for calling into
> the kernel. It's hard to argue that any application needs that
On Thu, Sep 28, 2023, at 13:40, Jeff Layton wrote:
> On Thu, 2023-09-28 at 10:19 -0700, Darrick J. Wong wrote:
>>
>> > I remember seeing those patches go by. I don't remember that change
>> > being NaK'ed, but I wasn't paying close attention at the time
>> >
>> > Looking at it objectively now, I
On Thu, Sep 28, 2023 at 01:40:55PM -0400, Jeff Layton wrote:
>
> Correct. We'd lose some fidelity in currently stored timestamps, but as
> Linus and Ted pointed out, anything below ~100ns granularity is
> effectively just noise, as that's the floor overhead for calling into
> the kernel. It's hard
On Thu, 2023-09-28 at 10:19 -0700, Darrick J. Wong wrote:
> On Thu, Sep 28, 2023 at 01:06:03PM -0400, Jeff Layton wrote:
> > On Thu, 2023-09-28 at 11:48 -0400, Arnd Bergmann wrote:
> > > On Thu, Sep 28, 2023, at 07:05, Jeff Layton wrote:
> > > > This shaves 8 bytes off struct inode, according to pa
On Fri, 2023-09-29 at 11:44 +0200, Christian Brauner wrote:
> > It is a lot of churn though.
>
> I think that i_{a,c,m}time shouldn't be accessed directly by
> filesystems same as no filesystem should really access i_{g,u}id which
> we also provide i_{g,u}id_{read,write}() accessors for. The mode
On Thu, 2023-09-28 at 11:48 -0400, Arnd Bergmann wrote:
> On Thu, Sep 28, 2023, at 07:05, Jeff Layton wrote:
> > This shaves 8 bytes off struct inode, according to pahole.
> >
> > Signed-off-by: Jeff Layton
>
> FWIW, this is similar to the approach that Deepa suggested
> back in 2016:
>
> https
On Thu, 28 Sept 2023 at 14:28, Theodore Ts'o wrote:
>
> I don't think anyone will complain about breaking the userspace API
> --- especially since if, say, the CIA was using this for their spies'
> drop boxes, they probably wouldn't want to admit it. :-)
Well, you will find that real apps do kin
On Thu, Sep 28, 2023, at 07:05, Jeff Layton wrote:
> This shaves 8 bytes off struct inode, according to pahole.
>
> Signed-off-by: Jeff Layton
FWIW, this is similar to the approach that Deepa suggested
back in 2016:
https://lore.kernel.org/lkml/1452144972-15802-3-git-send-email-deepa.ker...@gmai
On Fri, Sep 29, 2023 at 3:19 AM Linus Torvalds
wrote:
...
> So yes, real programs to cache stat information, and it matters for
> performance.
>
> But I don't think any actual reasonable program will have
> *correctness* issues, though -
I beg to disagree.
> because there are certainly filesyst
On Thu, Sep 28, 2023 at 01:06:03PM -0400, Jeff Layton wrote:
> On Thu, 2023-09-28 at 11:48 -0400, Arnd Bergmann wrote:
> > On Thu, Sep 28, 2023, at 07:05, Jeff Layton wrote:
> > > This shaves 8 bytes off struct inode, according to pahole.
> > >
> > > Signed-off-by: Jeff Layton
> >
> > FWIW, this
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