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

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On Fri, 14 Jun 2024 12:03:25 +0200 Christoph Hellwig <hch@xxxxxx> wrote:

> As of Linux 6.10-rc the MM can swap out larger than page size chunks.
> NFS has all code ready to handle this, but has a VM_BUG_ON that
> triggers when this happens.  Simply remove the VM_BUG_ON to fix this
> use case.
> 
> ...
>
> --- a/fs/nfs/direct.c
> +++ b/fs/nfs/direct.c
> @@ -141,8 +141,6 @@ int nfs_swap_rw(struct kiocb *iocb, struct iov_iter *iter)
>  {
>  	ssize_t ret;
>  
> -	VM_BUG_ON(iov_iter_count(iter) != PAGE_SIZE);
> -
>  	if (iov_iter_rw(iter) == READ)
>  		ret = nfs_file_direct_read(iocb, iter, true);
>  	else

I'm thinking this should precede "mm: swap: entirely map large folios
found in swapcache", or be a part of it.

Barry/Chuanhua, any opinions?




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