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?
