[dm-devel] [PATCH 2/6] block: remove the NULL bdev check in bdev_read_only

[Hannes Reinecke]

On 12/8/20 5:28 PM, 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 at lst.de>
> Reviewed-by: Ming Lei <ming.lei at redhat.com>
> Reviewed-by: Martin K. Petersen <martin.petersen at oracle.com>
> ---
>   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 b84b8671e6270a..8f2b89d1161813 100644
> --- a/block/genhd.c
> +++ b/block/genhd.c
> @@ -1652,11 +1652,8 @@ 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
>   
> 
Reviewed-by: Hannes Reinecke <hare at suse.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke                Kernel Storage Architect
hare at suse.de                              +49 911 74053 688
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