On Mon, Apr 26, 2021 at 10:06:24PM +0100, David Howells wrote: > @@ -968,7 +968,7 @@ int netfs_readpage(struct file *file, > return -ENOMEM; > } > rreq->mapping = page_file_mapping(page); > - rreq->start = page_index(page) * PAGE_SIZE; > + rreq->start = page_offset(page); This one needs to use page_file_offset() because swap-over-NFS. > @@ -1105,8 +1105,8 @@ int netfs_write_begin(struct file *file, struct address_space *mapping, > rreq = netfs_alloc_read_request(ops, netfs_priv, file); > if (!rreq) > goto error; > - rreq->mapping = page->mapping; > - rreq->start = page->index * PAGE_SIZE; > + rreq->mapping = page_file_mapping(page); There's nothing wrong with using page->mapping here. The swap-over-NFS path doesn't use write_begin, it uses O_DIRECT writes.
