[dm-devel] [PATCH v3 11/19] gfs: use __bio_add_page for adding single page to bio

[Andreas Gruenbacher]

On Wed, Apr 19, 2023 at 4:10 PM Johannes Thumshirn <jth at kernel.org> wrote:
>
> From: Johannes Thumshirn <johannes.thumshirn at wdc.com>
>
> The GFS superblock reading code uses bio_add_page() to add a page to a
> newly created bio. bio_add_page() can fail, but the return value is never
> checked.

It's GFS2, not GFS, but otherwise this is obviously fine, thanks.

> Use __bio_add_page() as adding a single page to a newly created bio is
> guaranteed to succeed.
>
> This brings us a step closer to marking bio_add_page() as __must_check.
>
> Signed-off-by: Johannes Thumshirn <johannes.thumshirn at wdc.com>
> Reviewed-by: Damien Le Moal <damien.lemoal at opensource.wdc.com>

Reviewed-by: Andreas Gruenbacher <agruenba at redhat.com>

> ---
>  fs/gfs2/ops_fstype.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
> index 6de901c3b89b..e0cd0d43b12f 100644
> --- a/fs/gfs2/ops_fstype.c
> +++ b/fs/gfs2/ops_fstype.c
> @@ -254,7 +254,7 @@ static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
>
>         bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS);
>         bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
> -       bio_add_page(bio, page, PAGE_SIZE, 0);
> +       __bio_add_page(bio, page, PAGE_SIZE, 0);
>
>         bio->bi_end_io = end_bio_io_page;
>         bio->bi_private = page;
> --
> 2.39.2
>