Re: [PATCH] nfs: fix nfs_swap_rw for large-folio swap

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On Tue, Jun 18, 2024 at 5:52 PM Christoph Hellwig <hch@xxxxxx> wrote:
>
> On Mon, Jun 17, 2024 at 08:02:47PM +1200, Barry Song wrote:
> > I did everything the same as above,
> > but always got failure at the last step to swapon:
> > /mnt/test # swapon swapfile
> > swapon: /mnt/test/swapfile: swapon failed: Invalid argument
>
> You are probably missing
>
> CONFIG_NFS_SWAP=y
>
> in your .config.

Yes, that was exactly what I missed. I then figured it out, reproduced
the issue,
and discovered that the root cause was unrelated to large folios. It
was actually
due to a batched bio plugging optimization from 2022. You can find the new patch
here:

https://lore.kernel.org/linux-mm/20240617220135.43563-1-21cnbao@xxxxxxxxx/


>





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