On Mon, Dec 07, 2020 at 02:19:14PM +0100, Christoph Hellwig wrote:
> Only a single caller can end up in bdev_read_only, so move the check there.
>
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> ---
> block/genhd.c | 3 ---
> fs/super.c | 3 ++-
> 2 files changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/block/genhd.c b/block/genhd.c
> index 09ff6cef028729..c87013879b8650 100644
> --- a/block/genhd.c
> +++ b/block/genhd.c
> @@ -1445,11 +1445,8 @@ EXPORT_SYMBOL(set_disk_ro);
>
> int bdev_read_only(struct block_device *bdev)
> {
> - if (!bdev)
> - return 0;
> return bdev->bd_read_only;
> }
> -
> EXPORT_SYMBOL(bdev_read_only);
>
> /*
> diff --git a/fs/super.c b/fs/super.c
> index 2c6cdea2ab2d9e..5a1f384ffc74f6 100644
> --- a/fs/super.c
> +++ b/fs/super.c
> @@ -865,7 +865,8 @@ int reconfigure_super(struct fs_context *fc)
>
> if (fc->sb_flags_mask & SB_RDONLY) {
> #ifdef CONFIG_BLOCK
> - if (!(fc->sb_flags & SB_RDONLY) && bdev_read_only(sb->s_bdev))
> + if (!(fc->sb_flags & SB_RDONLY) && sb->s_bdev &&
> + bdev_read_only(sb->s_bdev))
> return -EACCES;
> #endif
>
> --
> 2.29.2
>
Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx>
--
Ming
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