The V2 fixes look good to me.
William Kucharski
> On Nov 15, 2018, at 11:41 AM, p.jaroszynski@xxxxxxxxx wrote:
>
> Fixes: 82cb14175e7d ("xfs: add support for sub-pagesize writeback without buffer_heads")
> Signed-off-by: Piotr Jaroszynski <pjaroszynski@xxxxxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> ---
> fs/iomap.c | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/fs/iomap.c b/fs/iomap.c
> index 90c2febc93ac..7c369faea1dc 100644
> --- a/fs/iomap.c
> +++ b/fs/iomap.c
> @@ -117,6 +117,12 @@ iomap_page_create(struct inode *inode, struct page *page)
> atomic_set(&iop->read_count, 0);
> atomic_set(&iop->write_count, 0);
> bitmap_zero(iop->uptodate, PAGE_SIZE / SECTOR_SIZE);
> +
> + /*
> + * migrate_page_move_mapping() assumes that pages with private data have
> + * their count elevated by 1.
> + */
> + get_page(page);
> set_page_private(page, (unsigned long)iop);
> SetPagePrivate(page);
> return iop;
> @@ -133,6 +139,7 @@ iomap_page_release(struct page *page)
> WARN_ON_ONCE(atomic_read(&iop->write_count));
> ClearPagePrivate(page);
> set_page_private(page, 0);
> + put_page(page);
> kfree(iop);
> }
>
> --
> 2.11.0.262.g4b0a5b2.dirty
>
