Re: [PATCH 0/2] block: Allow concurrent BB context changes

[Hanna Czenczek]

On 09.02.24 15:08, Michael Tokarev wrote:
> 02.02.2024 17:47, Hanna Czenczek :
> > Hi,
> >
> > Without the AioContext lock, a BB's context may kind of change at any
> > time (unless it has a root node, and I/O requests are pending). That
> > also means that its own context (BlockBackend.ctx) and that of its root
> > node can differ sometimes (while the context is being changed).
>
> How relevant this is for -stable (8.2 at least) which does not have
> "scsi: eliminate AioContext lock" patchset, and in particular,:
> v8.2.0-124-geaad0fe260 "scsi: only access SCSIDevice->requests from
> one thread"?
>
> The issue first patch "block-backend: Allow concurrent context changes"
> fixes (RHEL-19381) seems to be for 8.1.something, so it exists in 8.2
> too, and this particular fix applies to 8.2.
>
> But with other changes around all this, I'm a bit lost as of what should
> be done on stable.  Not even thinking about 7.2 here :)

Ah, sorry, yes.  Since we do still have the AioContext lock, this series 
won’t be necessary in -stable.  Sorry for the noise!

Hanna