On Tue, 06/28 04:45, Christoph Hellwig wrote: > On Tue, Jun 28, 2016 at 10:39:15AM +0800, Fam Zheng wrote: > > Userspace listens to the KOBJ_ADD uevent generated in add_disk. At that > > point we haven't created the serial attribute file, therefore depending > > on how fast udev reacts, the /dev/disk/by-id/ entry doesn't always get > > created. > > > > This race condition can be easily reproduced by hot plugging a number of > > virtio-blk disks. > > > > Also in systemd, there used to be a related workaround in udev rules > > called 'WAIT_FOR="serial"', but it is removed in later versions. > > > > Now let's generate a KOBJ_CHANGE event after the attributes are ready. > > The same race is present in other drivers as well, e.g. nvme. Please > find a way to make this work properly without needing to hack every > driver to send events manually. OK, I'll take a look today! Fam _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
