Re: [PATCH 1/3] block_write_full_page: Use synchronous writes for WBC_SYNC_ALL writebacks

Theodore Tso
2009-04-08T15:26:24Z

On Wed, Apr 08, 2009 at 07:58:54AM +0200, Jens Axboe wrote:
>
> I'm not even sure what is documented about this sort of thing in biodoc,
> but it's actually somewhat outside the realm of block layer
> documentation. The block layer should document that you need to call
> unplug if you are going to be waiting for that IO. How the vm code does
> it is implementation detail mostly, the important thing is that it gets
> done :-)

Fair enough; I agree a lot of the problem is the page writeback
subsystem isn't well documented at all, and is crying out for a review
for possible refactorization and cleanup....

- Ted