[PATCH 35/44] block: move the policy field to struct block_device

[Jan Kara]

On Thu 26-11-20 14:04:13, Christoph Hellwig wrote:
> Move the policy field to struct block_device and rename it to the
> more descriptive bd_read_only.  Also turn the field into a bool as it
> is used as such.
> 
> Signed-off-by: Christoph Hellwig <hch at lst.de>

Looks good. You can add:

Reviewed-by: Jan Kara <jack at suse.cz>

								Honza

> ---
>  block/blk-core.c          | 2 +-
>  block/genhd.c             | 8 ++++----
>  block/ioctl.c             | 2 +-
>  block/partitions/core.c   | 4 ++--
>  include/linux/blk_types.h | 1 +
>  include/linux/genhd.h     | 4 ++--
>  6 files changed, 11 insertions(+), 10 deletions(-)
> 
> diff --git a/block/blk-core.c b/block/blk-core.c
> index 9121390be97a76..d64ffcb6f9ae5d 100644
> --- a/block/blk-core.c
> +++ b/block/blk-core.c
> @@ -696,7 +696,7 @@ static inline bool bio_check_ro(struct bio *bio, struct hd_struct *part)
>  {
>  	const int op = bio_op(bio);
>  
> -	if (part->policy && op_is_write(op)) {
> +	if (part->bdev->bd_read_only && op_is_write(op)) {
>  		char b[BDEVNAME_SIZE];
>  
>  		if (op_is_flush(bio->bi_opf) && !bio_sectors(bio))
> diff --git a/block/genhd.c b/block/genhd.c
> index 0371558ccde14c..ae312ccc6dd7c0 100644
> --- a/block/genhd.c
> +++ b/block/genhd.c
> @@ -1679,14 +1679,14 @@ void set_disk_ro(struct gendisk *disk, int flag)
>  	struct disk_part_iter piter;
>  	struct hd_struct *part;
>  
> -	if (disk->part0.policy != flag) {
> +	if (disk->part0.bdev->bd_read_only != flag) {
>  		set_disk_ro_uevent(disk, flag);
> -		disk->part0.policy = flag;
> +		disk->part0.bdev->bd_read_only = flag;
>  	}
>  
>  	disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
>  	while ((part = disk_part_iter_next(&piter)))
> -		part->policy = flag;
> +		part->bdev->bd_read_only = flag;
>  	disk_part_iter_exit(&piter);
>  }
>  
> @@ -1696,7 +1696,7 @@ int bdev_read_only(struct block_device *bdev)
>  {
>  	if (!bdev)
>  		return 0;
> -	return bdev->bd_part->policy;
> +	return bdev->bd_read_only;
>  }
>  
>  EXPORT_SYMBOL(bdev_read_only);
> diff --git a/block/ioctl.c b/block/ioctl.c
> index a6d8171221c7dc..d61d652078f41c 100644
> --- a/block/ioctl.c
> +++ b/block/ioctl.c
> @@ -345,7 +345,7 @@ static int blkdev_roset(struct block_device *bdev, fmode_t mode,
>  		if (ret)
>  			return ret;
>  	}
> -	bdev->bd_part->policy = n;
> +	bdev->bd_read_only = n;
>  	return 0;
>  }
>  
> diff --git a/block/partitions/core.c b/block/partitions/core.c
> index d1093adf2570e2..f397ec9922bd6e 100644
> --- a/block/partitions/core.c
> +++ b/block/partitions/core.c
> @@ -199,7 +199,7 @@ static ssize_t part_ro_show(struct device *dev,
>  			    struct device_attribute *attr, char *buf)
>  {
>  	struct hd_struct *p = dev_to_part(dev);
> -	return sprintf(buf, "%d\n", p->policy ? 1 : 0);
> +	return sprintf(buf, "%d\n", p->bdev->bd_read_only);
>  }
>  
>  static ssize_t part_alignment_offset_show(struct device *dev,
> @@ -420,7 +420,7 @@ static struct hd_struct *add_partition(struct gendisk *disk, int partno,
>  	bdev->bd_start_sect = start;
>  	bdev_set_nr_sectors(bdev, len);
>  	p->partno = partno;
> -	p->policy = get_disk_ro(disk);
> +	bdev->bd_read_only = get_disk_ro(disk);
>  
>  	if (info) {
>  		err = -ENOMEM;
> diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
> index b237f1e4081405..758cf71c9aa2a6 100644
> --- a/include/linux/blk_types.h
> +++ b/include/linux/blk_types.h
> @@ -23,6 +23,7 @@ struct block_device {
>  	sector_t		bd_start_sect;
>  	struct disk_stats __percpu *bd_stats;
>  	unsigned long		bd_stamp;
> +	bool			bd_read_only;	/* read-only policy */
>  	dev_t			bd_dev;
>  	int			bd_openers;
>  	struct inode *		bd_inode;	/* will die */
> diff --git a/include/linux/genhd.h b/include/linux/genhd.h
> index 349cf6403ccddc..dcbf9ef7610ea6 100644
> --- a/include/linux/genhd.h
> +++ b/include/linux/genhd.h
> @@ -55,7 +55,7 @@ struct hd_struct {
>  
>  	struct block_device *bdev;
>  	struct device __dev;
> -	int policy, partno;
> +	int partno;
>  	struct rcu_work rcu_work;
>  };
>  
> @@ -278,7 +278,7 @@ extern void set_disk_ro(struct gendisk *disk, int flag);
>  
>  static inline int get_disk_ro(struct gendisk *disk)
>  {
> -	return disk->part0.policy;
> +	return disk->part0.bdev->bd_read_only;
>  }
>  
>  extern void disk_block_events(struct gendisk *disk);
> -- 
> 2.29.2
> 
-- 
Jan Kara <jack at suse.com>
SUSE Labs, CR