Re: [PATCH 01/10] fs: turn inode ctime fields into a single ktime_t

[Christoph Hellwig]

On Tue, Jul 02, 2024 at 08:09:46AM -0400, Jeff Layton wrote:
> > > corrupt timestamps like this?
> > 
> > inode_set_ctime_to_ts should return an error if things are out of range.
> 
> Currently it just returns the timespec64 we're setting it to (which
> makes it easy to do several assignments), so we'd need to change its
> prototype to handle this case, and fix up the callers to recognize the
> error.
> 
> Alternately it may be easier to just add in a test for when
> __i_ctime == KTIME_MAX in the appropriate callers and have them error
> out. I'll have a look and see what makes sense.

The seems like a more awkward interface vs one that explicitly checks.

> 
> > How do we currently catch this when it comes from userland?
> > 
> 
> Not sure I understand this question. ctime values should never come
> from userland. They should only ever come from the system clock.

Ah, yes, utimes only changes mtime.