Re: [PATCH 07/20] nfs: Convert to migrate_folio

Anna Schumaker
2022-06-07T19:04:00Z

On Mon, Jun 6, 2022 at 7:37 PM Matthew Wilcox (Oracle)
<willy@infradead.org> wrote:
>
> Use a folio throughout this function. migrate_page() will be converted
> later.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>

Looks fairly straightforward.

Acked-by: Anna Schumaker <Anna.Schumaker@Netapp.com>

> ---
> fs/nfs/file.c | 4 +---
> fs/nfs/internal.h | 6 ++++--
> fs/nfs/write.c | 16 ++++++++--------
> 3 files changed, 13 insertions(+), 13 deletions(-)
>
> diff --git a/fs/nfs/file.c b/fs/nfs/file.c
> index 2d72b1b7ed74..549baed76351 100644
> --- a/fs/nfs/file.c
> +++ b/fs/nfs/file.c
> @@ -533,9 +533,7 @@ const struct address_space_operations nfs_file_aops = {
> .write_end = nfs_write_end,
> .invalidate_folio = nfs_invalidate_folio,
> .release_folio = nfs_release_folio,
> -#ifdef CONFIG_MIGRATION
> - .migratepage = nfs_migrate_page,
> -#endif
> + .migrate_folio = nfs_migrate_folio,
> .launder_folio = nfs_launder_folio,
> .is_dirty_writeback = nfs_check_dirty_writeback,
> .error_remove_page = generic_error_remove_page,
> diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
> index 8f8cd6e2d4db..437ebe544aaf 100644
> --- a/fs/nfs/internal.h
> +++ b/fs/nfs/internal.h
> @@ -578,8 +578,10 @@ void nfs_clear_pnfs_ds_commit_verifiers(struct pnfs_ds_commit_info *cinfo)
> #endif
>
> #ifdef CONFIG_MIGRATION
> -extern int nfs_migrate_page(struct address_space *,
> - struct page *, struct page *, enum migrate_mode);
> +int nfs_migrate_folio(struct address_space *, struct folio *dst,
> + struct folio *src, enum migrate_mode);
> +#else
> +#define nfs_migrate_folio NULL
> #endif
>
> static inline int
> diff --git a/fs/nfs/write.c b/fs/nfs/write.c
> index 1c706465d090..649b9e633459 100644
> --- a/fs/nfs/write.c
> +++ b/fs/nfs/write.c
> @@ -2119,27 +2119,27 @@ int nfs_wb_page(struct inode *inode, struct page *page)
> }
>
> #ifdef CONFIG_MIGRATION
> -int nfs_migrate_page(struct address_space *mapping, struct page *newpage,
> - struct page *page, enum migrate_mode mode)
> +int nfs_migrate_folio(struct address_space *mapping, struct folio *dst,
> + struct folio *src, enum migrate_mode mode)
> {
> /*
> - * If PagePrivate is set, then the page is currently associated with
> + * If the private flag is set, the folio is currently associated with
> * an in-progress read or write request. Don't try to migrate it.
> *
> * FIXME: we could do this in principle, but we'll need a way to ensure
> * that we can safely release the inode reference while holding
> - * the page lock.
> + * the folio lock.
> */
> - if (PagePrivate(page))
> + if (folio_test_private(src))
> return -EBUSY;
>
> - if (PageFsCache(page)) {
> + if (folio_test_fscache(src)) {
> if (mode == MIGRATE_ASYNC)
> return -EBUSY;
> - wait_on_page_fscache(page);
> + folio_wait_fscache(src);
> }
>
> - return migrate_page(mapping, newpage, page, mode);
> + return migrate_page(mapping, &dst->page, &src->page, mode);
> }
> #endif
>
> --
> 2.35.1
>