On 11/18/18 6:59 PM, Dave Chinner wrote: > On Sat, Nov 17, 2018 at 04:53:15PM -0700, Jens Axboe wrote: >> Add the field and have the blockdev direct_IO() helpers set it. >> This is in preparation for being able to poll for iocb completion. > > What purpose does this field serve? It's for later lookup to find the queue to poll on. > And why add it to just blockdev direct_IO and not the other direct > IO paths, too? Only block devices support polling. -- Jens Axboe
