Hi Jens, On 2020/5/29 下午10:20, Jens Axboe wrote: > On 5/29/20 1:18 AM, Jiufei Xue wrote: >> When read from a regular file that was opened O_NONBLOCK, it will >> return EAGAIN if the page is not cached, which is not expected and >> fails the application. >> >> Applications written before expect that the open flag O_NONBLOCK has >> no effect on a regular file. >> >> Fix this by not setting REQ_F_NOWAIT for regular files. > > Agree, this also matches what we do for sockets. You need to update > the comment as well, though. > Reading from an O_NONBLOCK socket will return EAGAIN if there isn't any unread data in the buffer which is expected.So I don't know what is your meaning about that. Do you mean the recv() interface? Regards, Jiufei
