[PATCH v2.2 2/3] xfs: make xfs_growfs_rt update secondary superblocks

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

When we call growfs on the data device, we update the secondary
superblocks to reflect the updated filesystem geometry.  We need to do
this for growfs on the realtime volume too, because a future xfs_repair
run could try to fix the filesystem using a backup superblock.

This was observed by the online superblock scrubbers while running
xfs/233.  One can also trigger this by growing an rt volume, cycling the
mount, and creating new rt files.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
v2.2: don't update on error, don't fail to free memory on error
---
 fs/xfs/xfs_rtalloc.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 1c3969807fb9..f9119ba3e9d0 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -18,7 +18,7 @@
 #include "xfs_trans_space.h"
 #include "xfs_icache.h"
 #include "xfs_rtalloc.h"
-
+#include "xfs_sb.h"
 
 /*
  * Read and return the summary information for a given extent size,
@@ -1102,7 +1102,13 @@ xfs_growfs_rt(
 		if (error)
 			break;
 	}
+	if (error)
+		goto out_free;
 
+	/* Update secondary superblocks now the physical grow has completed */
+	error = xfs_update_secondary_sbs(mp);
+
+out_free:
 	/*
 	 * Free the fake mp structure.
 	 */