This adds support in dm for the block PR read keys and read reservation
callouts.
Signed-off-by: Mike Christie <michael.christie@xxxxxxxxxx>
---
drivers/md/dm.c | 69 +++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index dfde0088147a..b4103cb6eb9a 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -3119,6 +3119,8 @@ 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,
@@ -3351,12 +3353,79 @@ 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 = {
--
2.25.1
--
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