[PATCH v6 09/27] libmultipath: Add mpath_bdev_getgeo()

[John Garry]

From: John Garry <john.garry@xxxxxxxxx>

Add mpath_bdev_getgeo() as a multipath block device .getgeo handler.

Here we just redirect into the selected mpath_device disk fops->getgeo
handler.

Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
 lib/multipath.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/multipath.c b/lib/multipath.c
index f1758d1e60a60..2017c4d0a210c 100644
--- a/lib/multipath.c
+++ b/lib/multipath.c
@@ -490,6 +490,26 @@ static int mpath_bdev_ioctl(struct block_device *bdev, blk_mode_t mode,
 	return err;
 }
 
+static int mpath_bdev_getgeo(struct gendisk *disk, struct hd_geometry *geo)
+{
+	struct mpath_head *mpath_head = mpath_gendisk_to_head(disk);
+	int srcu_idx, ret = -EWOULDBLOCK;
+	struct mpath_device *mpath_device;
+
+	srcu_idx = srcu_read_lock(&mpath_head->srcu);
+	mpath_device = mpath_find_path(mpath_head);
+	if (mpath_device) {
+		if (mpath_device->disk->fops->getgeo)
+			ret = mpath_device->disk->fops->getgeo(
+					mpath_device->disk, geo);
+		else
+			ret = -ENOTTY; /* See blkdev_getgeo */
+	}
+	srcu_read_unlock(&mpath_head->srcu, srcu_idx);
+
+	return ret;
+}
+
 const struct block_device_operations mpath_ops = {
 	.owner          = THIS_MODULE,
 	.open		= mpath_bdev_open,
@@ -501,6 +521,7 @@ const struct block_device_operations mpath_ops = {
 	 * avoid their custom compat_ioctl implementation.
 	 */
 	.compat_ioctl	= blkdev_compat_ptr_ioctl,
+	.getgeo		= mpath_bdev_getgeo,
 };
 EXPORT_SYMBOL_GPL(mpath_ops);
 
-- 
2.43.7