Re: [PATCH v2 4/8] block: make before-write notifiers thread-safe

[Vladimir Sementsov-Ogievskiy]

22.04.2021 00:23, Vladimir Sementsov-Ogievskiy wrote:
> 19.04.2021 11:55, Emanuele Giuseppe Esposito wrote:
> > Reads access the list in RCU style, so be careful to avoid use-after-free
> > scenarios in the backup block job.  Apart from this, all that's needed
> > is protecting updates with a mutex.
>
> Note that backup doesn't use write-notifiers now. Probably best thing to do is 
> to update other users to use filters instead of write notifiers, and drop write 
> notifiers at all. But it may require more work, so don't care.

But on the other hand.. Why not. We can go without filter and still drop write-notifiers. 
Look at my new patch "[PATCH] block: simplify write-threshold and drop write 
notifiers"

--
Best regards,
Vladimir