On Fri, Aug 27, 2021 at 06:49:21PM +0200, Andreas Gruenbacher wrote:
> When a user copy fails in one of the helpers of iomap_dio_rw, fail with
> -EFAULT instead of returning 0. This matches what iomap_dio_bio_actor
> returns when it gets an -EFAULT from bio_iov_iter_get_pages. With these
> changes, iomap_dio_actor now consistently fails with -EFAULT when a user
> page cannot be faulted in.
>
> Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx>
--D
> ---
> fs/iomap/direct-io.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
> index 9398b8c31323..8054f5d6c273 100644
> --- a/fs/iomap/direct-io.c
> +++ b/fs/iomap/direct-io.c
> @@ -370,7 +370,7 @@ iomap_dio_hole_actor(loff_t length, struct iomap_dio *dio)
> {
> length = iov_iter_zero(length, dio->submit.iter);
> dio->size += length;
> - return length;
> + return length ? length : -EFAULT;
> }
>
> static loff_t
> @@ -397,7 +397,7 @@ iomap_dio_inline_actor(struct inode *inode, loff_t pos, loff_t length,
> copied = copy_to_iter(iomap->inline_data + pos, length, iter);
> }
> dio->size += copied;
> - return copied;
> + return copied ? copied : -EFAULT;
> }
>
> static loff_t
> --
> 2.26.3
>
