On Fri, Oct 21, 2022 at 11:15:34AM +0800, Yu Kuai wrote: > Hi, > > 在 2022/10/21 0:47, Christoph Hellwig 写道: >> As mentioned before I don't think we should make this even more >> crufty in the block layer. See the series I just sent to move it int >> dm. > > It seems we had some misunderstanding, the problem I tried to fix here > should not just related to dm, but all the caller of > bd_link_disk_holder(). As far as I can tell the problem was just that patch 1 in my series blows away the bd_holder_dir pointer in part0 on del_gendisk. Each holder actually holds a reference to the kobject, so the memory for it is still valid, it's just that the pointer got cleared. I'll send a v2 in a bit.
