From 474ef7ce832d471148f63a9d07f67fc5564834f1 Mon Sep 17 00:00:00 2001
From: Josh Durgin <josh.durgin@inktank.com>
Date: Mon, 21 Nov 2011 17:13:54 -0800
Subject: 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 <josh.durgin@inktank.com>
Reviewed-by: Alex Elder <elder@inktank.com>

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 730d0ce..f171ceb 100644
--- 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);
 
-- 
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