[PATCH 09/13] libmultipath: Add PR support

[Keith Busch]

On Wed, Feb 25, 2026 at 03:32:21PM +0000, John Garry wrote:
> +static int mpath_pr_register(struct block_device *bdev, u64 old_key,
> +			u64 new_key, unsigned int flags)
> +{
> +	struct mpath_disk *mpath_disk = dev_get_drvdata(&bdev->bd_device);
> +	struct mpath_head *mpath_head = mpath_disk->mpath_head;
> +	struct mpath_device *mpath_device;
> +	int srcu_idx, ret = -EWOULDBLOCK;
> +
> +	srcu_idx = srcu_read_lock(&mpath_head->srcu);
> +	mpath_device = mpath_find_path(mpath_head);
> +	if (mpath_device)
> +		ret = mpath_head->mpdt->pr_ops->pr_register(mpath_device,
> +				old_key, new_key, flags);
> +	srcu_read_unlock(&mpath_head->srcu, srcu_idx);

Instead of having the lower layer define new mp template functions, why
not use the existing pr_ops from mpath_device->disk->fops->pr_ops?