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
