Re: [RFC PATCH] io_uring: add support for IORING_OP_GETDENTS64

[Andres Freund]

Hi,

On 2021-01-24 01:59:05 +0000, Al Viro wrote:
> On Sat, Jan 23, 2021 at 03:50:55PM -0800, Andres Freund wrote:
> 
> > As there's only a shared lock, seems like both would end up with the
> > same ctx->pos and end up updating f_pos to the same offset (assuming the
> > same count).
> > 
> > Am I missing something?
> 
> This:
>         f = fdget_pos(fd);
>         if (!f.file)
>                 return -EBADF;
> in the callers.

Ah. Thanks for the explainer, userspace guy here ;). I hadn't realized
that fdget_pos acquired a lock around the position...

Regards,

Andres