Re: [git pull] vfs part 2

[Al Viro]

On Sun, Jun 21, 2015 at 02:16:15PM -0700, Linus Torvalds wrote:
> On Sun, Jun 21, 2015 at 2:12 PM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> > +               if (count > rsize) {
> > +                       WARN_ON(1);
> > +                       count = rsize;
> > +               }
> 
> So if we'd actually want to merge it with the warning, I'd prefer writing it as
> 
>         if (WARN_ON_ONCE(count > rsize))
>               count = size;
> 
> because it's smaller and cannot spam your logs. WARN_ON_ONCE() will
> only _warn_ once, but it always returns the conditional for the
> warning, so the above does the right thing.

Sure, but I would really like to verify that this _is_ what's going on
there.  This is just a "please try that on your reproducer to make sure
that it's not something entirely different", thus the lack of S-o-b,
etc.  For the final variant (and we definitely should cope with BS from
server) we probably want to use p9_debug() instead of WARN_ON/WARN_ON_ONCE.
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