[dm-devel] [PATCH 06/11] dm: Add support for block PR read keys/reservation.

[Mike Christie]

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

Signed-off-by: Mike Christie <michael.chris...@oracle.com>
---
 drivers/md/dm.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 82957bd460e8..ca544dfc3210 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -3114,12 +3114,56 @@ static int dm_pr_clear(struct block_device *bdev, u64 
key)
        return r;
 }
 
+static int dm_pr_read_keys(struct block_device *bdev, struct pr_keys *keys,
+                          int keys_data_len)
+{
+       struct mapped_device *md = bdev->bd_disk->private_data;
+       const struct pr_ops *ops;
+       int r, srcu_idx;
+
+       r = dm_prepare_ioctl(md, &srcu_idx, &bdev);
+       if (r < 0)
+               goto out;
+
+       ops = bdev->bd_disk->fops->pr_ops;
+       if (ops && ops->pr_read_keys)
+               r = ops->pr_read_keys(bdev, keys, keys_data_len);
+       else
+               r = -EOPNOTSUPP;
+out:
+       dm_unprepare_ioctl(md, srcu_idx);
+       return r;
+}
+
+static int dm_pr_read_reservation(struct block_device *bdev,
+                                 struct pr_held_reservation *rsv)
+{
+       struct mapped_device *md = bdev->bd_disk->private_data;
+       const struct pr_ops *ops;
+       int r, srcu_idx;
+
+       r = dm_prepare_ioctl(md, &srcu_idx, &bdev);
+       if (r < 0)
+               goto out;
+
+       ops = bdev->bd_disk->fops->pr_ops;
+       if (ops && ops->pr_read_reservation)
+               r = ops->pr_read_reservation(bdev, rsv);
+       else
+               r = -EOPNOTSUPP;
+out:
+       dm_unprepare_ioctl(md, srcu_idx);
+       return r;
+}
+
 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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