Commit 8a8da082 authored by Mike Christie's avatar Mike Christie Committed by Martin K. Petersen
Browse files

dm: Add support for block PR read keys/reservation 



This adds support in dm for the block PR read keys and read reservation
callouts.

Signed-off-by: default avatarMike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20230407200551.12660-7-michael.christie@oracle.com


Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent 0af7b5e2

drivers/md/dm.c

+69 −0
Original line number Diff line number Diff line
@@ -3114,6 +3114,8 @@ struct dm_pr { 
	bool	fail_early;

	int	ret;

	enum pr_type type;

	struct pr_keys *read_keys;

	struct pr_held_reservation *rsv;

};



static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn,
@@ -3346,12 +3348,79 @@ static int dm_pr_clear(struct block_device *bdev, u64 key) 
	return r;

}



static int __dm_pr_read_keys(struct dm_target *ti, struct dm_dev *dev,

			     sector_t start, sector_t len, void *data)

{

	struct dm_pr *pr = data;

	const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops;



	if (!ops || !ops->pr_read_keys) {

		pr->ret = -EOPNOTSUPP;

		return -1;

	}



	pr->ret = ops->pr_read_keys(dev->bdev, pr->read_keys);

	if (!pr->ret)

		return -1;



	return 0;

}



static int dm_pr_read_keys(struct block_device *bdev, struct pr_keys *keys)

{

	struct dm_pr pr = {

		.read_keys = keys,

	};

	int ret;



	ret = dm_call_pr(bdev, __dm_pr_read_keys, &pr);

	if (ret)

		return ret;



	return pr.ret;

}



static int __dm_pr_read_reservation(struct dm_target *ti, struct dm_dev *dev,

				    sector_t start, sector_t len, void *data)

{

	struct dm_pr *pr = data;

	const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops;



	if (!ops || !ops->pr_read_reservation) {

		pr->ret = -EOPNOTSUPP;

		return -1;

	}



	pr->ret = ops->pr_read_reservation(dev->bdev, pr->rsv);

	if (!pr->ret)

		return -1;



	return 0;

}



static int dm_pr_read_reservation(struct block_device *bdev,

				  struct pr_held_reservation *rsv)

{

	struct dm_pr pr = {

		.rsv = rsv,

	};

	int ret;



	ret = dm_call_pr(bdev, __dm_pr_read_reservation, &pr);

	if (ret)

		return ret;



	return pr.ret;

}



static const struct pr_ops dm_pr_ops = {

	.pr_register	= dm_pr_register,

	.pr_reserve	= dm_pr_reserve,

	.pr_release	= dm_pr_release,

	.pr_preempt	= dm_pr_preempt,

	.pr_clear	= dm_pr_clear,

	.pr_read_keys	= dm_pr_read_keys,

	.pr_read_reservation = dm_pr_read_reservation,

};



static const struct block_device_operations dm_blk_dops = {