Hi.
On Mon, 2006-11-20 at 23:18 +0100, Rafael J. Wysocki wrote:
> I think I/O can only be submitted from the process context. Thus if we freeze
> all (and I mean _all_) threads that are used by filesystems, including worker
> threads, we should effectively prevent fs-related I/O from being submitted
> after tasks have been frozen.
I know that will work. It's what I used to do before the switch to bdev
freezing. I guess I need to look again at why I made the switch. Perhaps
it was just because you guys gave freezing kthreads a bad wrap as too
invasive or something. Bdev freezing is certainly fewer lines of code.
> This can be done with the help of create_freezeable_workqueue() introduced in
> this patch and I'd like to implement it (and there are only a few filesystems
> that use work queues).
>
> The freezing of bdevs might be a good solution if:
> (1) we were sure it wouldn't interact with dm in a wrong way,
> (2) _all_ of the filesystems implemented it.
> For now, neither (1) nor (2) are satisfied and we need to know we're safe
> _now_.
Yeah.
Regards,
Nigel
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