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?
Thanks,
NeilBrown
>
> See the DM commit
>
> 63a4f0 ("dm: fix add_disk() NULL pointer due to race with free_dev()")
>
> for a template.
>
> Unregistering the device too early means we'll have half constructed
> bdis hanging around, which caused all kinds of problems for filesystems
> and the writeback code.
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