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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: Mike Christie <michael.christie@oracle.com>
Link: https://lore.kernel.org/r/20230407200551.12660-7-michael.christie@oracle.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Mike Christie 2023-04-07 15:05:39 -05:00 committed by Martin K. Petersen
parent 0af7b5e236
commit 8a8da082e9
1 changed files with 69 additions and 0 deletions
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69
drivers/md/dm.c
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@ -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 @@ out:
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 = {