rbd: only reset capacity when pointing to head

Snapshots cannot be resized, and the new capacity of head should not be reflected by the snapshot. Signed-off-by: Josh Durgin <[email protected]> Reviewed-by: Alex Elder <[email protected]>
cbmeeks · Jul 31, 2012 · 474ef7c · 474ef7c
1 parent e88a36e
commit 474ef7c
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
@@ -1725,7 +1725,12 @@ static int __rbd_refresh_header(struct rbd_device *rbd_dev)
 		return ret;
 
 	/* resized? */
-	set_capacity(rbd_dev->disk, h.image_size / SECTOR_SIZE);
+	if (rbd_dev->snap_id == CEPH_NOSNAP) {
+		sector_t size = (sector_t) h.image_size / SECTOR_SIZE;
+
+		dout("setting size to %llu sectors", (unsigned long long) size);
+		set_capacity(rbd_dev->disk, size);
+	}
 
 	down_write(&rbd_dev->header_rwsem);