On Thu, Apr 23, 2015 at 06:03:14PM +1000, NeilBrown wrote: > On Thu, 23 Apr 2015 09:37:24 +0200 Christoph Hellwig <hch@xxxxxx> wrote: > > > Plase fix your device name lifetimes. > > Any chance you could be more explicit? > > The commit you identified doesn't seem to help much - md and dm are quite > different in this area. > > It seems that it is no longer safe to call 'add_disk' between calling > 'del_gendisk' and bdi_destroy being called. How can I find out if I am in > that window, or wait for bdi_destroy to be called? The bdi is only around if the device is open, either through a device node, or through a blkdev_get from a file system. If you get duplicate names that means you're trying to allocate a new gendisk while the old one is still around. In theory you're fine once the device gets ->release called. Except that we can hold sysfs reference to the qeue, eww. So for now try to follow the dm model, but I'll need to add a callback to the queue called once the request_queue actually is released for this. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
