Re: [PATCH 1/6] dm: use bdev_read_only to check if a device is read-only

[Ming Lei <ming.lei@redhat.com>]

On Mon, Dec 07, 2020 at 02:19:13PM +0100, Christoph Hellwig wrote:
> dm-thin and dm-cache also work on partitions, so use the proper
> interface to check if the device is read-only.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> Reviewed-by: Hannes Reinecke <hare@suse.de>
> ---
>  drivers/md/dm-cache-metadata.c | 2 +-
>  drivers/md/dm-thin-metadata.c  | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/md/dm-cache-metadata.c b/drivers/md/dm-cache-metadata.c
> index af6d4f898e4c1d..89a73204dbf47f 100644
> --- a/drivers/md/dm-cache-metadata.c
> +++ b/drivers/md/dm-cache-metadata.c
> @@ -449,7 +449,7 @@ static int __check_incompat_features(struct cache_disk_superblock *disk_super,
>  	/*
>  	 * Check for read-only metadata to skip the following RDWR checks.
>  	 */
> -	if (get_disk_ro(cmd->bdev->bd_disk))
> +	if (bdev_read_only(cmd->bdev))
>  		return 0;
>  
>  	features = le32_to_cpu(disk_super->compat_ro_flags) & ~DM_CACHE_FEATURE_COMPAT_RO_SUPP;
> diff --git a/drivers/md/dm-thin-metadata.c b/drivers/md/dm-thin-metadata.c
> index 6ebb2127f3e2e0..e75b20480e460e 100644
> --- a/drivers/md/dm-thin-metadata.c
> +++ b/drivers/md/dm-thin-metadata.c
> @@ -636,7 +636,7 @@ static int __check_incompat_features(struct thin_disk_superblock *disk_super,
>  	/*
>  	 * Check for read-only metadata to skip the following RDWR checks.
>  	 */
> -	if (get_disk_ro(pmd->bdev->bd_disk))
> +	if (bdev_read_only(pmd->bdev))
>  		return 0;
>  
>  	features = le32_to_cpu(disk_super->compat_ro_flags) & ~THIN_FEATURE_COMPAT_RO_SUPP;
> -- 
> 2.29.2
> 

Reviewed-by: Ming Lei <ming.lei@redhat.com>

-- 
Ming