[PATCH v3 12/13] libmultipath: Add mpath_bdev_getgeo()

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 <[email protected]>
---
 lib/multipath.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/multipath.c b/lib/multipath.c
index 4e4b347875500..26d9b17998d66 100644
--- a/lib/multipath.c
+++ b/lib/multipath.c
@@ -547,6 +547,26 @@ 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;
+}
+
 static int mpath_pr_register(struct block_device *bdev, u64 old_key,
 			u64 new_key, unsigned int flags)
 {
@@ -736,6 +756,7 @@ const struct block_device_operations mpath_ops = {
 	.ioctl		= mpath_bdev_ioctl,
 	.compat_ioctl	= blkdev_compat_ptr_ioctl,
 	.report_zones	= mpath_bdev_report_zones,
+	.getgeo		= mpath_bdev_getgeo,
 	.pr_ops		= &mpath_pr_ops,
 };
 EXPORT_SYMBOL_GPL(mpath_ops);
-- 
2.43.7